diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst --- a/clang/docs/UsersManual.rst +++ b/clang/docs/UsersManual.rst @@ -3871,7 +3871,7 @@ On ``x86_64-mingw32``, passing i128(by value) is incompatible with the Microsoft x64 calling convention. You might need to tweak -``WinX86_64ABIInfo::classify()`` in lib/CodeGen/TargetInfo.cpp. +``WinX86_64ABIInfo::classify()`` in lib/CodeGen/Targets/X86.cpp. For the X86 target, clang supports the `-m16` command line argument which enables 16-bit code output. This is broadly similar to diff --git a/clang/docs/tools/clang-formatted-files.txt b/clang/docs/tools/clang-formatted-files.txt --- a/clang/docs/tools/clang-formatted-files.txt +++ b/clang/docs/tools/clang-formatted-files.txt @@ -378,6 +378,8 @@ clang/lib/Basic/Targets/WebAssembly.cpp clang/lib/Basic/Targets/WebAssembly.h clang/lib/Basic/Targets/XCore.cpp +clang/lib/CodeGen/ABIInfoImpl.cpp +clang/lib/CodeGen/ABIInfoImpl.h clang/lib/CodeGen/CGCUDARuntime.cpp clang/lib/CodeGen/CGLoopInfo.cpp clang/lib/CodeGen/CGLoopInfo.h diff --git a/clang/lib/CodeGen/ABIInfo.h b/clang/lib/CodeGen/ABIInfo.h --- a/clang/lib/CodeGen/ABIInfo.h +++ b/clang/lib/CodeGen/ABIInfo.h @@ -93,6 +93,9 @@ uint64_t Members) const; virtual bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const; + /// isHomogeneousAggregate - Return true if a type is an ELFv2 homogeneous + /// aggregate. Base is set to the base element type, and Members is set + /// to the number of base elements. bool isHomogeneousAggregate(QualType Ty, const Type *&Base, uint64_t &Members) const; diff --git a/clang/lib/CodeGen/ABIInfo.cpp b/clang/lib/CodeGen/ABIInfo.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/ABIInfo.cpp @@ -0,0 +1,231 @@ +//===- ABIInfo.cpp --------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfo.h" +#include "ABIInfoImpl.h" + +using namespace clang; +using namespace clang::CodeGen; + +// Pin the vtable to this file. +ABIInfo::~ABIInfo() = default; + +CGCXXABI &ABIInfo::getCXXABI() const { return CGT.getCXXABI(); } + +ASTContext &ABIInfo::getContext() const { return CGT.getContext(); } + +llvm::LLVMContext &ABIInfo::getVMContext() const { + return CGT.getLLVMContext(); +} + +const llvm::DataLayout &ABIInfo::getDataLayout() const { + return CGT.getDataLayout(); +} + +const TargetInfo &ABIInfo::getTarget() const { return CGT.getTarget(); } + +const CodeGenOptions &ABIInfo::getCodeGenOpts() const { + return CGT.getCodeGenOpts(); +} + +bool ABIInfo::isAndroid() const { return getTarget().getTriple().isAndroid(); } + +bool ABIInfo::isOHOSFamily() const { + return getTarget().getTriple().isOHOSFamily(); +} + +Address ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + return Address::invalid(); +} + +bool ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { + return false; +} + +bool ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base, + uint64_t Members) const { + return false; +} + +bool ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const { + // For compatibility with GCC, ignore empty bitfields in C++ mode. + return getContext().getLangOpts().CPlusPlus; +} + +bool ABIInfo::isHomogeneousAggregate(QualType Ty, const Type *&Base, + uint64_t &Members) const { + if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) { + uint64_t NElements = AT->getSize().getZExtValue(); + if (NElements == 0) + return false; + if (!isHomogeneousAggregate(AT->getElementType(), Base, Members)) + return false; + Members *= NElements; + } else if (const RecordType *RT = Ty->getAs()) { + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return false; + + Members = 0; + + // If this is a C++ record, check the properties of the record such as + // bases and ABI specific restrictions + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + if (!getCXXABI().isPermittedToBeHomogeneousAggregate(CXXRD)) + return false; + + for (const auto &I : CXXRD->bases()) { + // Ignore empty records. + if (isEmptyRecord(getContext(), I.getType(), true)) + continue; + + uint64_t FldMembers; + if (!isHomogeneousAggregate(I.getType(), Base, FldMembers)) + return false; + + Members += FldMembers; + } + } + + for (const auto *FD : RD->fields()) { + // Ignore (non-zero arrays of) empty records. + QualType FT = FD->getType(); + while (const ConstantArrayType *AT = + getContext().getAsConstantArrayType(FT)) { + if (AT->getSize().getZExtValue() == 0) + return false; + FT = AT->getElementType(); + } + if (isEmptyRecord(getContext(), FT, true)) + continue; + + if (isZeroLengthBitfieldPermittedInHomogeneousAggregate() && + FD->isZeroLengthBitField(getContext())) + continue; + + uint64_t FldMembers; + if (!isHomogeneousAggregate(FD->getType(), Base, FldMembers)) + return false; + + Members = (RD->isUnion() ? + std::max(Members, FldMembers) : Members + FldMembers); + } + + if (!Base) + return false; + + // Ensure there is no padding. + if (getContext().getTypeSize(Base) * Members != + getContext().getTypeSize(Ty)) + return false; + } else { + Members = 1; + if (const ComplexType *CT = Ty->getAs()) { + Members = 2; + Ty = CT->getElementType(); + } + + // Most ABIs only support float, double, and some vector type widths. + if (!isHomogeneousAggregateBaseType(Ty)) + return false; + + // The base type must be the same for all members. Types that + // agree in both total size and mode (float vs. vector) are + // treated as being equivalent here. + const Type *TyPtr = Ty.getTypePtr(); + if (!Base) { + Base = TyPtr; + // If it's a non-power-of-2 vector, its size is already a power-of-2, + // so make sure to widen it explicitly. + if (const VectorType *VT = Base->getAs()) { + QualType EltTy = VT->getElementType(); + unsigned NumElements = + getContext().getTypeSize(VT) / getContext().getTypeSize(EltTy); + Base = getContext() + .getVectorType(EltTy, NumElements, VT->getVectorKind()) + .getTypePtr(); + } + } + + if (Base->isVectorType() != TyPtr->isVectorType() || + getContext().getTypeSize(Base) != getContext().getTypeSize(TyPtr)) + return false; + } + return Members > 0 && isHomogeneousAggregateSmallEnough(Base, Members); +} + +bool ABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const { + if (getContext().isPromotableIntegerType(Ty)) + return true; + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() < getContext().getTypeSize(getContext().IntTy)) + return true; + + return false; +} + +ABIArgInfo ABIInfo::getNaturalAlignIndirect(QualType Ty, bool ByVal, + bool Realign, + llvm::Type *Padding) const { + return ABIArgInfo::getIndirect(getContext().getTypeAlignInChars(Ty), ByVal, + Realign, Padding); +} + +ABIArgInfo ABIInfo::getNaturalAlignIndirectInReg(QualType Ty, + bool Realign) const { + return ABIArgInfo::getIndirectInReg(getContext().getTypeAlignInChars(Ty), + /*ByVal*/ false, Realign); +} + +// Pin the vtable to this file. +SwiftABIInfo::~SwiftABIInfo() = default; + +/// Does the given lowering require more than the given number of +/// registers when expanded? +/// +/// This is intended to be the basis of a reasonable basic implementation +/// of should{Pass,Return}Indirectly. +/// +/// For most targets, a limit of four total registers is reasonable; this +/// limits the amount of code required in order to move around the value +/// in case it wasn't produced immediately prior to the call by the caller +/// (or wasn't produced in exactly the right registers) or isn't used +/// immediately within the callee. But some targets may need to further +/// limit the register count due to an inability to support that many +/// return registers. +bool SwiftABIInfo::occupiesMoreThan(ArrayRef scalarTypes, + unsigned maxAllRegisters) const { + unsigned intCount = 0, fpCount = 0; + for (llvm::Type *type : scalarTypes) { + if (type->isPointerTy()) { + intCount++; + } else if (auto intTy = dyn_cast(type)) { + auto ptrWidth = CGT.getTarget().getPointerWidth(LangAS::Default); + intCount += (intTy->getBitWidth() + ptrWidth - 1) / ptrWidth; + } else { + assert(type->isVectorTy() || type->isFloatingPointTy()); + fpCount++; + } + } + + return (intCount + fpCount > maxAllRegisters); +} + +bool SwiftABIInfo::shouldPassIndirectly(ArrayRef ComponentTys, + bool AsReturnValue) const { + return occupiesMoreThan(ComponentTys, /*total=*/4); +} + +bool SwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, + unsigned NumElts) const { + // The default implementation of this assumes that the target guarantees + // 128-bit SIMD support but nothing more. + return (VectorSize.getQuantity() > 8 && VectorSize.getQuantity() <= 16); +} diff --git a/clang/lib/CodeGen/ABIInfoImpl.h b/clang/lib/CodeGen/ABIInfoImpl.h new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/ABIInfoImpl.h @@ -0,0 +1,152 @@ +//===- ABIInfoImpl.h --------------------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CLANG_LIB_CODEGEN_ABIINFOIMPL_H +#define LLVM_CLANG_LIB_CODEGEN_ABIINFOIMPL_H + +#include "ABIInfo.h" +#include "CGCXXABI.h" + +namespace clang::CodeGen { + +/// DefaultABIInfo - The default implementation for ABI specific +/// details. This implementation provides information which results in +/// self-consistent and sensible LLVM IR generation, but does not +/// conform to any particular ABI. +class DefaultABIInfo : public ABIInfo { +public: + DefaultABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {} + + virtual ~DefaultABIInfo(); + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType RetTy) const; + + void computeInfo(CGFunctionInfo &FI) const override; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +// Helper for coercing an aggregate argument or return value into an integer +// array of the same size (including padding) and alignment. This alternate +// coercion happens only for the RenderScript ABI and can be removed after +// runtimes that rely on it are no longer supported. +// +// RenderScript assumes that the size of the argument / return value in the IR +// is the same as the size of the corresponding qualified type. This helper +// coerces the aggregate type into an array of the same size (including +// padding). This coercion is used in lieu of expansion of struct members or +// other canonical coercions that return a coerced-type of larger size. +// +// Ty - The argument / return value type +// Context - The associated ASTContext +// LLVMContext - The associated LLVMContext +ABIArgInfo coerceToIntArray(QualType Ty, ASTContext &Context, + llvm::LLVMContext &LLVMContext); + +void AssignToArrayRange(CodeGen::CGBuilderTy &Builder, llvm::Value *Array, + llvm::Value *Value, unsigned FirstIndex, + unsigned LastIndex); + +bool isAggregateTypeForABI(QualType T); + +llvm::Type *getVAListElementType(CodeGenFunction &CGF); + +CGCXXABI::RecordArgABI getRecordArgABI(const RecordType *RT, CGCXXABI &CXXABI); + +CGCXXABI::RecordArgABI getRecordArgABI(QualType T, CGCXXABI &CXXABI); + +bool classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI, + const ABIInfo &Info); + +/// Pass transparent unions as if they were the type of the first element. Sema +/// should ensure that all elements of the union have the same "machine type". +QualType useFirstFieldIfTransparentUnion(QualType Ty); + +// Dynamically round a pointer up to a multiple of the given alignment. +llvm::Value *emitRoundPointerUpToAlignment(CodeGenFunction &CGF, + llvm::Value *Ptr, CharUnits Align); + +/// Emit va_arg for a platform using the common void* representation, +/// where arguments are simply emitted in an array of slots on the stack. +/// +/// This version implements the core direct-value passing rules. +/// +/// \param SlotSize - The size and alignment of a stack slot. +/// Each argument will be allocated to a multiple of this number of +/// slots, and all the slots will be aligned to this value. +/// \param AllowHigherAlign - The slot alignment is not a cap; +/// an argument type with an alignment greater than the slot size +/// will be emitted on a higher-alignment address, potentially +/// leaving one or more empty slots behind as padding. If this +/// is false, the returned address might be less-aligned than +/// DirectAlign. +/// \param ForceRightAdjust - Default is false. On big-endian platform and +/// if the argument is smaller than a slot, set this flag will force +/// right-adjust the argument in its slot irrespective of the type. +Address emitVoidPtrDirectVAArg(CodeGenFunction &CGF, Address VAListAddr, + llvm::Type *DirectTy, CharUnits DirectSize, + CharUnits DirectAlign, CharUnits SlotSize, + bool AllowHigherAlign, + bool ForceRightAdjust = false); + +/// Emit va_arg for a platform using the common void* representation, +/// where arguments are simply emitted in an array of slots on the stack. +/// +/// \param IsIndirect - Values of this type are passed indirectly. +/// \param ValueInfo - The size and alignment of this type, generally +/// computed with getContext().getTypeInfoInChars(ValueTy). +/// \param SlotSizeAndAlign - The size and alignment of a stack slot. +/// Each argument will be allocated to a multiple of this number of +/// slots, and all the slots will be aligned to this value. +/// \param AllowHigherAlign - The slot alignment is not a cap; +/// an argument type with an alignment greater than the slot size +/// will be emitted on a higher-alignment address, potentially +/// leaving one or more empty slots behind as padding. +/// \param ForceRightAdjust - Default is false. On big-endian platform and +/// if the argument is smaller than a slot, set this flag will force +/// right-adjust the argument in its slot irrespective of the type. +Address emitVoidPtrVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType ValueTy, bool IsIndirect, + TypeInfoChars ValueInfo, CharUnits SlotSizeAndAlign, + bool AllowHigherAlign, bool ForceRightAdjust = false); + +Address emitMergePHI(CodeGenFunction &CGF, Address Addr1, + llvm::BasicBlock *Block1, Address Addr2, + llvm::BasicBlock *Block2, const llvm::Twine &Name = ""); + +/// isEmptyField - Return true iff a the field is "empty", that is it +/// is an unnamed bit-field or an (array of) empty record(s). +bool isEmptyField(ASTContext &Context, const FieldDecl *FD, bool AllowArrays); + +/// isEmptyRecord - Return true iff a structure contains only empty +/// fields. Note that a structure with a flexible array member is not +/// considered empty. +bool isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays); + +/// isSingleElementStruct - Determine if a structure is a "single +/// element struct", i.e. it has exactly one non-empty field or +/// exactly one field which is itself a single element +/// struct. Structures with flexible array members are never +/// considered single element structs. +/// +/// \return The field declaration for the single non-empty field, if +/// it exists. +const Type *isSingleElementStruct(QualType T, ASTContext &Context); + +Address EmitVAArgInstr(CodeGenFunction &CGF, Address VAListAddr, QualType Ty, + const ABIArgInfo &AI); + +bool isSIMDVectorType(ASTContext &Context, QualType Ty); + +bool isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty); + +} // namespace clang::CodeGen + +#endif // LLVM_CLANG_LIB_CODEGEN_ABIINFOIMPL_H diff --git a/clang/lib/CodeGen/ABIInfoImpl.cpp b/clang/lib/CodeGen/ABIInfoImpl.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/ABIInfoImpl.cpp @@ -0,0 +1,453 @@ +//===- ABIInfoImpl.cpp ----------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" + +using namespace clang; +using namespace clang::CodeGen; + +// Pin the vtable to this file. +DefaultABIInfo::~DefaultABIInfo() = default; + +ABIArgInfo DefaultABIInfo::classifyArgumentType(QualType Ty) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + if (isAggregateTypeForABI(Ty)) { + // Records with non-trivial destructors/copy-constructors should not be + // passed by value. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + return getNaturalAlignIndirect(Ty); + } + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + ASTContext &Context = getContext(); + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > + Context.getTypeSize(Context.getTargetInfo().hasInt128Type() + ? Context.Int128Ty + : Context.LongLongTy)) + return getNaturalAlignIndirect(Ty); + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); +} + +ABIArgInfo DefaultABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (isAggregateTypeForABI(RetTy)) + return getNaturalAlignIndirect(RetTy); + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > + getContext().getTypeSize(getContext().getTargetInfo().hasInt128Type() + ? getContext().Int128Ty + : getContext().LongLongTy)) + return getNaturalAlignIndirect(RetTy); + + return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +void DefaultABIInfo::computeInfo(CGFunctionInfo &FI) const { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); +} + +Address DefaultABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty)); +} + +ABIArgInfo CodeGen::coerceToIntArray(QualType Ty, ASTContext &Context, + llvm::LLVMContext &LLVMContext) { + // Alignment and Size are measured in bits. + const uint64_t Size = Context.getTypeSize(Ty); + const uint64_t Alignment = Context.getTypeAlign(Ty); + llvm::Type *IntType = llvm::Type::getIntNTy(LLVMContext, Alignment); + const uint64_t NumElements = (Size + Alignment - 1) / Alignment; + return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements)); +} + +void CodeGen::AssignToArrayRange(CodeGen::CGBuilderTy &Builder, + llvm::Value *Array, llvm::Value *Value, + unsigned FirstIndex, unsigned LastIndex) { + // Alternatively, we could emit this as a loop in the source. + for (unsigned I = FirstIndex; I <= LastIndex; ++I) { + llvm::Value *Cell = + Builder.CreateConstInBoundsGEP1_32(Builder.getInt8Ty(), Array, I); + Builder.CreateAlignedStore(Value, Cell, CharUnits::One()); + } +} + +bool CodeGen::isAggregateTypeForABI(QualType T) { + return !CodeGenFunction::hasScalarEvaluationKind(T) || + T->isMemberFunctionPointerType(); +} + +llvm::Type *CodeGen::getVAListElementType(CodeGenFunction &CGF) { + return CGF.ConvertTypeForMem( + CGF.getContext().getBuiltinVaListType()->getPointeeType()); +} + +CGCXXABI::RecordArgABI CodeGen::getRecordArgABI(const RecordType *RT, + CGCXXABI &CXXABI) { + const CXXRecordDecl *RD = dyn_cast(RT->getDecl()); + if (!RD) { + if (!RT->getDecl()->canPassInRegisters()) + return CGCXXABI::RAA_Indirect; + return CGCXXABI::RAA_Default; + } + return CXXABI.getRecordArgABI(RD); +} + +CGCXXABI::RecordArgABI CodeGen::getRecordArgABI(QualType T, CGCXXABI &CXXABI) { + const RecordType *RT = T->getAs(); + if (!RT) + return CGCXXABI::RAA_Default; + return getRecordArgABI(RT, CXXABI); +} + +bool CodeGen::classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI, + const ABIInfo &Info) { + QualType Ty = FI.getReturnType(); + + if (const auto *RT = Ty->getAs()) + if (!isa(RT->getDecl()) && + !RT->getDecl()->canPassInRegisters()) { + FI.getReturnInfo() = Info.getNaturalAlignIndirect(Ty); + return true; + } + + return CXXABI.classifyReturnType(FI); +} + +QualType CodeGen::useFirstFieldIfTransparentUnion(QualType Ty) { + if (const RecordType *UT = Ty->getAsUnionType()) { + const RecordDecl *UD = UT->getDecl(); + if (UD->hasAttr()) { + assert(!UD->field_empty() && "sema created an empty transparent union"); + return UD->field_begin()->getType(); + } + } + return Ty; +} + +llvm::Value *CodeGen::emitRoundPointerUpToAlignment(CodeGenFunction &CGF, + llvm::Value *Ptr, + CharUnits Align) { + // OverflowArgArea = (OverflowArgArea + Align - 1) & -Align; + llvm::Value *RoundUp = CGF.Builder.CreateConstInBoundsGEP1_32( + CGF.Builder.getInt8Ty(), Ptr, Align.getQuantity() - 1); + return CGF.Builder.CreateIntrinsic( + llvm::Intrinsic::ptrmask, {CGF.AllocaInt8PtrTy, CGF.IntPtrTy}, + {RoundUp, llvm::ConstantInt::get(CGF.IntPtrTy, -Align.getQuantity())}, + nullptr, Ptr->getName() + ".aligned"); +} + +Address +CodeGen::emitVoidPtrDirectVAArg(CodeGenFunction &CGF, Address VAListAddr, + llvm::Type *DirectTy, CharUnits DirectSize, + CharUnits DirectAlign, CharUnits SlotSize, + bool AllowHigherAlign, bool ForceRightAdjust) { + // Cast the element type to i8* if necessary. Some platforms define + // va_list as a struct containing an i8* instead of just an i8*. + if (VAListAddr.getElementType() != CGF.Int8PtrTy) + VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy); + + llvm::Value *Ptr = CGF.Builder.CreateLoad(VAListAddr, "argp.cur"); + + // If the CC aligns values higher than the slot size, do so if needed. + Address Addr = Address::invalid(); + if (AllowHigherAlign && DirectAlign > SlotSize) { + Addr = Address(emitRoundPointerUpToAlignment(CGF, Ptr, DirectAlign), + CGF.Int8Ty, DirectAlign); + } else { + Addr = Address(Ptr, CGF.Int8Ty, SlotSize); + } + + // Advance the pointer past the argument, then store that back. + CharUnits FullDirectSize = DirectSize.alignTo(SlotSize); + Address NextPtr = + CGF.Builder.CreateConstInBoundsByteGEP(Addr, FullDirectSize, "argp.next"); + CGF.Builder.CreateStore(NextPtr.getPointer(), VAListAddr); + + // If the argument is smaller than a slot, and this is a big-endian + // target, the argument will be right-adjusted in its slot. + if (DirectSize < SlotSize && CGF.CGM.getDataLayout().isBigEndian() && + (!DirectTy->isStructTy() || ForceRightAdjust)) { + Addr = CGF.Builder.CreateConstInBoundsByteGEP(Addr, SlotSize - DirectSize); + } + + Addr = CGF.Builder.CreateElementBitCast(Addr, DirectTy); + return Addr; +} + +Address CodeGen::emitVoidPtrVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType ValueTy, bool IsIndirect, + TypeInfoChars ValueInfo, + CharUnits SlotSizeAndAlign, + bool AllowHigherAlign, + bool ForceRightAdjust) { + // The size and alignment of the value that was passed directly. + CharUnits DirectSize, DirectAlign; + if (IsIndirect) { + DirectSize = CGF.getPointerSize(); + DirectAlign = CGF.getPointerAlign(); + } else { + DirectSize = ValueInfo.Width; + DirectAlign = ValueInfo.Align; + } + + // Cast the address we've calculated to the right type. + llvm::Type *DirectTy = CGF.ConvertTypeForMem(ValueTy), *ElementTy = DirectTy; + if (IsIndirect) { + unsigned AllocaAS = CGF.CGM.getDataLayout().getAllocaAddrSpace(); + DirectTy = llvm::PointerType::get(CGF.getLLVMContext(), AllocaAS); + } + + Address Addr = emitVoidPtrDirectVAArg(CGF, VAListAddr, DirectTy, DirectSize, + DirectAlign, SlotSizeAndAlign, + AllowHigherAlign, ForceRightAdjust); + + if (IsIndirect) { + Addr = Address(CGF.Builder.CreateLoad(Addr), ElementTy, ValueInfo.Align); + } + + return Addr; +} + +Address CodeGen::emitMergePHI(CodeGenFunction &CGF, Address Addr1, + llvm::BasicBlock *Block1, Address Addr2, + llvm::BasicBlock *Block2, + const llvm::Twine &Name) { + assert(Addr1.getType() == Addr2.getType()); + llvm::PHINode *PHI = CGF.Builder.CreatePHI(Addr1.getType(), 2, Name); + PHI->addIncoming(Addr1.getPointer(), Block1); + PHI->addIncoming(Addr2.getPointer(), Block2); + CharUnits Align = std::min(Addr1.getAlignment(), Addr2.getAlignment()); + return Address(PHI, Addr1.getElementType(), Align); +} + +bool CodeGen::isEmptyField(ASTContext &Context, const FieldDecl *FD, + bool AllowArrays) { + if (FD->isUnnamedBitfield()) + return true; + + QualType FT = FD->getType(); + + // Constant arrays of empty records count as empty, strip them off. + // Constant arrays of zero length always count as empty. + bool WasArray = false; + if (AllowArrays) + while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) { + if (AT->getSize() == 0) + return true; + FT = AT->getElementType(); + // The [[no_unique_address]] special case below does not apply to + // arrays of C++ empty records, so we need to remember this fact. + WasArray = true; + } + + const RecordType *RT = FT->getAs(); + if (!RT) + return false; + + // C++ record fields are never empty, at least in the Itanium ABI. + // + // FIXME: We should use a predicate for whether this behavior is true in the + // current ABI. + // + // The exception to the above rule are fields marked with the + // [[no_unique_address]] attribute (since C++20). Those do count as empty + // according to the Itanium ABI. The exception applies only to records, + // not arrays of records, so we must also check whether we stripped off an + // array type above. + if (isa(RT->getDecl()) && + (WasArray || !FD->hasAttr())) + return false; + + return isEmptyRecord(Context, FT, AllowArrays); +} + +bool CodeGen::isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays) { + const RecordType *RT = T->getAs(); + if (!RT) + return false; + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return false; + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) + for (const auto &I : CXXRD->bases()) + if (!isEmptyRecord(Context, I.getType(), true)) + return false; + + for (const auto *I : RD->fields()) + if (!isEmptyField(Context, I, AllowArrays)) + return false; + return true; +} + +const Type *CodeGen::isSingleElementStruct(QualType T, ASTContext &Context) { + const RecordType *RT = T->getAs(); + if (!RT) + return nullptr; + + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return nullptr; + + const Type *Found = nullptr; + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + for (const auto &I : CXXRD->bases()) { + // Ignore empty records. + if (isEmptyRecord(Context, I.getType(), true)) + continue; + + // If we already found an element then this isn't a single-element struct. + if (Found) + return nullptr; + + // If this is non-empty and not a single element struct, the composite + // cannot be a single element struct. + Found = isSingleElementStruct(I.getType(), Context); + if (!Found) + return nullptr; + } + } + + // Check for single element. + for (const auto *FD : RD->fields()) { + QualType FT = FD->getType(); + + // Ignore empty fields. + if (isEmptyField(Context, FD, true)) + continue; + + // If we already found an element then this isn't a single-element + // struct. + if (Found) + return nullptr; + + // Treat single element arrays as the element. + while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) { + if (AT->getSize().getZExtValue() != 1) + break; + FT = AT->getElementType(); + } + + if (!isAggregateTypeForABI(FT)) { + Found = FT.getTypePtr(); + } else { + Found = isSingleElementStruct(FT, Context); + if (!Found) + return nullptr; + } + } + + // We don't consider a struct a single-element struct if it has + // padding beyond the element type. + if (Found && Context.getTypeSize(Found) != Context.getTypeSize(T)) + return nullptr; + + return Found; +} + +Address CodeGen::EmitVAArgInstr(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty, const ABIArgInfo &AI) { + // This default implementation defers to the llvm backend's va_arg + // instruction. It can handle only passing arguments directly + // (typically only handled in the backend for primitive types), or + // aggregates passed indirectly by pointer (NOTE: if the "byval" + // flag has ABI impact in the callee, this implementation cannot + // work.) + + // Only a few cases are covered here at the moment -- those needed + // by the default abi. + llvm::Value *Val; + + if (AI.isIndirect()) { + assert(!AI.getPaddingType() && + "Unexpected PaddingType seen in arginfo in generic VAArg emitter!"); + assert( + !AI.getIndirectRealign() && + "Unexpected IndirectRealign seen in arginfo in generic VAArg emitter!"); + + auto TyInfo = CGF.getContext().getTypeInfoInChars(Ty); + CharUnits TyAlignForABI = TyInfo.Align; + + llvm::Type *ElementTy = CGF.ConvertTypeForMem(Ty); + llvm::Type *BaseTy = llvm::PointerType::getUnqual(ElementTy); + llvm::Value *Addr = + CGF.Builder.CreateVAArg(VAListAddr.getPointer(), BaseTy); + return Address(Addr, ElementTy, TyAlignForABI); + } else { + assert((AI.isDirect() || AI.isExtend()) && + "Unexpected ArgInfo Kind in generic VAArg emitter!"); + + assert(!AI.getInReg() && + "Unexpected InReg seen in arginfo in generic VAArg emitter!"); + assert(!AI.getPaddingType() && + "Unexpected PaddingType seen in arginfo in generic VAArg emitter!"); + assert(!AI.getDirectOffset() && + "Unexpected DirectOffset seen in arginfo in generic VAArg emitter!"); + assert(!AI.getCoerceToType() && + "Unexpected CoerceToType seen in arginfo in generic VAArg emitter!"); + + Address Temp = CGF.CreateMemTemp(Ty, "varet"); + Val = CGF.Builder.CreateVAArg(VAListAddr.getPointer(), + CGF.ConvertTypeForMem(Ty)); + CGF.Builder.CreateStore(Val, Temp); + return Temp; + } +} + +bool CodeGen::isSIMDVectorType(ASTContext &Context, QualType Ty) { + return Ty->getAs() && Context.getTypeSize(Ty) == 128; +} + +bool CodeGen::isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty) { + const RecordType *RT = Ty->getAs(); + if (!RT) + return false; + const RecordDecl *RD = RT->getDecl(); + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) + for (const auto &I : CXXRD->bases()) + if (!isRecordWithSIMDVectorType(Context, I.getType())) + return false; + + for (const auto *i : RD->fields()) { + QualType FT = i->getType(); + + if (isSIMDVectorType(Context, FT)) + return true; + + if (isRecordWithSIMDVectorType(Context, FT)) + return true; + } + + return false; +} diff --git a/clang/lib/CodeGen/CMakeLists.txt b/clang/lib/CodeGen/CMakeLists.txt --- a/clang/lib/CodeGen/CMakeLists.txt +++ b/clang/lib/CodeGen/CMakeLists.txt @@ -31,6 +31,8 @@ ) add_clang_library(clangCodeGen + ABIInfo.cpp + ABIInfoImpl.cpp BackendUtil.cpp CGAtomic.cpp CGBlocks.cpp @@ -87,6 +89,31 @@ SanitizerMetadata.cpp SwiftCallingConv.cpp TargetInfo.cpp + Targets/AArch64.cpp + Targets/AMDGPU.cpp + Targets/ARC.cpp + Targets/ARM.cpp + Targets/AVR.cpp + Targets/BPF.cpp + Targets/CSKY.cpp + Targets/Hexagon.cpp + Targets/Lanai.cpp + Targets/LoongArch.cpp + Targets/M68k.cpp + Targets/MSP430.cpp + Targets/Mips.cpp + Targets/NVPTX.cpp + Targets/PNaCl.cpp + Targets/PPC.cpp + Targets/RISCV.cpp + Targets/SPIR.cpp + Targets/Sparc.cpp + Targets/SystemZ.cpp + Targets/TCE.cpp + Targets/VE.cpp + Targets/WebAssembly.cpp + Targets/X86.cpp + Targets/XCore.cpp VarBypassDetector.cpp DEPENDS diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp --- a/clang/lib/CodeGen/CodeGenModule.cpp +++ b/clang/lib/CodeGen/CodeGenModule.cpp @@ -100,6 +100,228 @@ llvm_unreachable("invalid C++ ABI kind"); } +static std::unique_ptr +createTargetCodeGenInfo(CodeGenModule &CGM) { + const TargetInfo &Target = CGM.getTarget(); + const llvm::Triple &Triple = Target.getTriple(); + const CodeGenOptions &CodeGenOpts = CGM.getCodeGenOpts(); + + switch (Triple.getArch()) { + default: + return createDefaultTargetCodeGenInfo(CGM); + + case llvm::Triple::le32: + return createPNaClTargetCodeGenInfo(CGM); + case llvm::Triple::m68k: + return createM68kTargetCodeGenInfo(CGM); + case llvm::Triple::mips: + case llvm::Triple::mipsel: + if (Triple.getOS() == llvm::Triple::NaCl) + return createPNaClTargetCodeGenInfo(CGM); + return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/true); + + case llvm::Triple::mips64: + case llvm::Triple::mips64el: + return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/false); + + case llvm::Triple::avr: { + // For passing parameters, R8~R25 are used on avr, and R18~R25 are used + // on avrtiny. For passing return value, R18~R25 are used on avr, and + // R22~R25 are used on avrtiny. + unsigned NPR = Target.getABI() == "avrtiny" ? 6 : 18; + unsigned NRR = Target.getABI() == "avrtiny" ? 4 : 8; + return createAVRTargetCodeGenInfo(CGM, NPR, NRR); + } + + case llvm::Triple::aarch64: + case llvm::Triple::aarch64_32: + case llvm::Triple::aarch64_be: { + AArch64ABIKind Kind = AArch64ABIKind::AAPCS; + if (Target.getABI() == "darwinpcs") + Kind = AArch64ABIKind::DarwinPCS; + else if (Triple.isOSWindows()) + return createWindowsAArch64TargetCodeGenInfo(CGM, AArch64ABIKind::Win64); + + return createAArch64TargetCodeGenInfo(CGM, Kind); + } + + case llvm::Triple::wasm32: + case llvm::Triple::wasm64: { + WebAssemblyABIKind Kind = WebAssemblyABIKind::MVP; + if (Target.getABI() == "experimental-mv") + Kind = WebAssemblyABIKind::ExperimentalMV; + return createWebAssemblyTargetCodeGenInfo(CGM, Kind); + } + + case llvm::Triple::arm: + case llvm::Triple::armeb: + case llvm::Triple::thumb: + case llvm::Triple::thumbeb: { + if (Triple.getOS() == llvm::Triple::Win32) + return createWindowsARMTargetCodeGenInfo(CGM, ARMABIKind::AAPCS_VFP); + + ARMABIKind Kind = ARMABIKind::AAPCS; + StringRef ABIStr = Target.getABI(); + if (ABIStr == "apcs-gnu") + Kind = ARMABIKind::APCS; + else if (ABIStr == "aapcs16") + Kind = ARMABIKind::AAPCS16_VFP; + else if (CodeGenOpts.FloatABI == "hard" || + (CodeGenOpts.FloatABI != "soft" && + (Triple.getEnvironment() == llvm::Triple::GNUEABIHF || + Triple.getEnvironment() == llvm::Triple::MuslEABIHF || + Triple.getEnvironment() == llvm::Triple::EABIHF))) + Kind = ARMABIKind::AAPCS_VFP; + + return createARMTargetCodeGenInfo(CGM, Kind); + } + + case llvm::Triple::ppc: { + if (Triple.isOSAIX()) + return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/false); + + bool IsSoftFloat = + CodeGenOpts.FloatABI == "soft" || Target.hasFeature("spe"); + return createPPC32TargetCodeGenInfo(CGM, IsSoftFloat); + } + case llvm::Triple::ppcle: { + bool IsSoftFloat = CodeGenOpts.FloatABI == "soft"; + return createPPC32TargetCodeGenInfo(CGM, IsSoftFloat); + } + case llvm::Triple::ppc64: + if (Triple.isOSAIX()) + return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/true); + + if (Triple.isOSBinFormatELF()) { + PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv1; + if (Target.getABI() == "elfv2") + Kind = PPC64_SVR4_ABIKind::ELFv2; + bool IsSoftFloat = CodeGenOpts.FloatABI == "soft"; + + return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, IsSoftFloat); + } + return createPPC64TargetCodeGenInfo(CGM); + case llvm::Triple::ppc64le: { + assert(Triple.isOSBinFormatELF() && "PPC64 LE non-ELF not supported!"); + PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv2; + if (Target.getABI() == "elfv1") + Kind = PPC64_SVR4_ABIKind::ELFv1; + bool IsSoftFloat = CodeGenOpts.FloatABI == "soft"; + + return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, IsSoftFloat); + } + + case llvm::Triple::nvptx: + case llvm::Triple::nvptx64: + return createNVPTXTargetCodeGenInfo(CGM); + + case llvm::Triple::msp430: + return createMSP430TargetCodeGenInfo(CGM); + + case llvm::Triple::riscv32: + case llvm::Triple::riscv64: { + StringRef ABIStr = Target.getABI(); + unsigned XLen = Target.getPointerWidth(LangAS::Default); + unsigned ABIFLen = 0; + if (ABIStr.endswith("f")) + ABIFLen = 32; + else if (ABIStr.endswith("d")) + ABIFLen = 64; + return createRISCVTargetCodeGenInfo(CGM, XLen, ABIFLen); + } + + case llvm::Triple::systemz: { + bool SoftFloat = CodeGenOpts.FloatABI == "soft"; + bool HasVector = !SoftFloat && Target.getABI() == "vector"; + return createSystemZTargetCodeGenInfo(CGM, HasVector, SoftFloat); + } + + case llvm::Triple::tce: + case llvm::Triple::tcele: + return createTCETargetCodeGenInfo(CGM); + + case llvm::Triple::x86: { + bool IsDarwinVectorABI = Triple.isOSDarwin(); + bool IsWin32FloatStructABI = Triple.isOSWindows() && !Triple.isOSCygMing(); + + if (Triple.getOS() == llvm::Triple::Win32) { + return createWinX86_32TargetCodeGenInfo( + CGM, IsDarwinVectorABI, IsWin32FloatStructABI, + CodeGenOpts.NumRegisterParameters); + } + return createX86_32TargetCodeGenInfo( + CGM, IsDarwinVectorABI, IsWin32FloatStructABI, + CodeGenOpts.NumRegisterParameters, CodeGenOpts.FloatABI == "soft"); + } + + case llvm::Triple::x86_64: { + StringRef ABI = Target.getABI(); + X86AVXABILevel AVXLevel = (ABI == "avx512" ? X86AVXABILevel::AVX512 + : ABI == "avx" ? X86AVXABILevel::AVX + : X86AVXABILevel::None); + + switch (Triple.getOS()) { + case llvm::Triple::Win32: + return createWinX86_64TargetCodeGenInfo(CGM, AVXLevel); + default: + return createX86_64TargetCodeGenInfo(CGM, AVXLevel); + } + } + case llvm::Triple::hexagon: + return createHexagonTargetCodeGenInfo(CGM); + case llvm::Triple::lanai: + return createLanaiTargetCodeGenInfo(CGM); + case llvm::Triple::r600: + return createAMDGPUTargetCodeGenInfo(CGM); + case llvm::Triple::amdgcn: + return createAMDGPUTargetCodeGenInfo(CGM); + case llvm::Triple::sparc: + return createSparcV8TargetCodeGenInfo(CGM); + case llvm::Triple::sparcv9: + return createSparcV9TargetCodeGenInfo(CGM); + case llvm::Triple::xcore: + return createXCoreTargetCodeGenInfo(CGM); + case llvm::Triple::arc: + return createARCTargetCodeGenInfo(CGM); + case llvm::Triple::spir: + case llvm::Triple::spir64: + return createCommonSPIRTargetCodeGenInfo(CGM); + case llvm::Triple::spirv32: + case llvm::Triple::spirv64: + return createSPIRVTargetCodeGenInfo(CGM); + case llvm::Triple::ve: + return createVETargetCodeGenInfo(CGM); + case llvm::Triple::csky: { + bool IsSoftFloat = !Target.hasFeature("hard-float-abi"); + bool hasFP64 = + Target.hasFeature("fpuv2_df") || Target.hasFeature("fpuv3_df"); + return createCSKYTargetCodeGenInfo(CGM, IsSoftFloat ? 0 + : hasFP64 ? 64 + : 32); + } + case llvm::Triple::bpfeb: + case llvm::Triple::bpfel: + return createBPFTargetCodeGenInfo(CGM); + case llvm::Triple::loongarch32: + case llvm::Triple::loongarch64: { + StringRef ABIStr = Target.getABI(); + unsigned ABIFRLen = 0; + if (ABIStr.endswith("f")) + ABIFRLen = 32; + else if (ABIStr.endswith("d")) + ABIFRLen = 64; + return createLoongArchTargetCodeGenInfo( + CGM, Target.getPointerWidth(LangAS::Default), ABIFRLen); + } + } +} + +const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() { + if (!TheTargetCodeGenInfo) + TheTargetCodeGenInfo = createTargetCodeGenInfo(*this); + return *TheTargetCodeGenInfo; +} + CodeGenModule::CodeGenModule(ASTContext &C, IntrusiveRefCntPtr FS, const HeaderSearchOptions &HSO, @@ -4849,6 +5071,10 @@ llvm_unreachable("No such linkage"); } +bool CodeGenModule::supportsCOMDAT() const { + return getTriple().supportsCOMDAT(); +} + void CodeGenModule::maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO) { if (!shouldBeInCOMDAT(*this, D)) diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp --- a/clang/lib/CodeGen/TargetInfo.cpp +++ b/clang/lib/CodeGen/TargetInfo.cpp @@ -13,247 +13,18 @@ #include "TargetInfo.h" #include "ABIInfo.h" -#include "CGBlocks.h" -#include "CGCXXABI.h" -#include "CGValue.h" +#include "ABIInfoImpl.h" #include "CodeGenFunction.h" -#include "clang/AST/Attr.h" -#include "clang/AST/RecordLayout.h" -#include "clang/Basic/Builtins.h" #include "clang/Basic/CodeGenOptions.h" -#include "clang/Basic/DiagnosticFrontend.h" #include "clang/CodeGen/CGFunctionInfo.h" -#include "llvm/ADT/SmallBitVector.h" #include "llvm/ADT/StringExtras.h" -#include "llvm/ADT/StringSwitch.h" #include "llvm/ADT/Twine.h" -#include "llvm/IR/DataLayout.h" -#include "llvm/IR/IntrinsicsNVPTX.h" -#include "llvm/IR/IntrinsicsS390.h" #include "llvm/IR/Type.h" -#include "llvm/Support/MathExtras.h" #include "llvm/Support/raw_ostream.h" -#include "llvm/TargetParser/RISCVTargetParser.h" -#include "llvm/TargetParser/Triple.h" -#include using namespace clang; using namespace CodeGen; -// Helper for coercing an aggregate argument or return value into an integer -// array of the same size (including padding) and alignment. This alternate -// coercion happens only for the RenderScript ABI and can be removed after -// runtimes that rely on it are no longer supported. -// -// RenderScript assumes that the size of the argument / return value in the IR -// is the same as the size of the corresponding qualified type. This helper -// coerces the aggregate type into an array of the same size (including -// padding). This coercion is used in lieu of expansion of struct members or -// other canonical coercions that return a coerced-type of larger size. -// -// Ty - The argument / return value type -// Context - The associated ASTContext -// LLVMContext - The associated LLVMContext -static ABIArgInfo coerceToIntArray(QualType Ty, - ASTContext &Context, - llvm::LLVMContext &LLVMContext) { - // Alignment and Size are measured in bits. - const uint64_t Size = Context.getTypeSize(Ty); - const uint64_t Alignment = Context.getTypeAlign(Ty); - llvm::Type *IntType = llvm::Type::getIntNTy(LLVMContext, Alignment); - const uint64_t NumElements = (Size + Alignment - 1) / Alignment; - return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements)); -} - -static void AssignToArrayRange(CodeGen::CGBuilderTy &Builder, - llvm::Value *Array, - llvm::Value *Value, - unsigned FirstIndex, - unsigned LastIndex) { - // Alternatively, we could emit this as a loop in the source. - for (unsigned I = FirstIndex; I <= LastIndex; ++I) { - llvm::Value *Cell = - Builder.CreateConstInBoundsGEP1_32(Builder.getInt8Ty(), Array, I); - Builder.CreateAlignedStore(Value, Cell, CharUnits::One()); - } -} - -static bool isAggregateTypeForABI(QualType T) { - return !CodeGenFunction::hasScalarEvaluationKind(T) || - T->isMemberFunctionPointerType(); -} - -ABIArgInfo ABIInfo::getNaturalAlignIndirect(QualType Ty, bool ByVal, - bool Realign, - llvm::Type *Padding) const { - return ABIArgInfo::getIndirect(getContext().getTypeAlignInChars(Ty), ByVal, - Realign, Padding); -} - -ABIArgInfo -ABIInfo::getNaturalAlignIndirectInReg(QualType Ty, bool Realign) const { - return ABIArgInfo::getIndirectInReg(getContext().getTypeAlignInChars(Ty), - /*ByVal*/ false, Realign); -} - -Address ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - return Address::invalid(); -} - -static llvm::Type *getVAListElementType(CodeGenFunction &CGF) { - return CGF.ConvertTypeForMem( - CGF.getContext().getBuiltinVaListType()->getPointeeType()); -} - -bool ABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const { - if (getContext().isPromotableIntegerType(Ty)) - return true; - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() < getContext().getTypeSize(getContext().IntTy)) - return true; - - return false; -} - -ABIInfo::~ABIInfo() = default; - -SwiftABIInfo::~SwiftABIInfo() = default; - -/// Does the given lowering require more than the given number of -/// registers when expanded? -/// -/// This is intended to be the basis of a reasonable basic implementation -/// of should{Pass,Return}Indirectly. -/// -/// For most targets, a limit of four total registers is reasonable; this -/// limits the amount of code required in order to move around the value -/// in case it wasn't produced immediately prior to the call by the caller -/// (or wasn't produced in exactly the right registers) or isn't used -/// immediately within the callee. But some targets may need to further -/// limit the register count due to an inability to support that many -/// return registers. -bool SwiftABIInfo::occupiesMoreThan(ArrayRef scalarTypes, - unsigned maxAllRegisters) const { - unsigned intCount = 0, fpCount = 0; - for (llvm::Type *type : scalarTypes) { - if (type->isPointerTy()) { - intCount++; - } else if (auto intTy = dyn_cast(type)) { - auto ptrWidth = CGT.getTarget().getPointerWidth(LangAS::Default); - intCount += (intTy->getBitWidth() + ptrWidth - 1) / ptrWidth; - } else { - assert(type->isVectorTy() || type->isFloatingPointTy()); - fpCount++; - } - } - - return (intCount + fpCount > maxAllRegisters); -} - -bool SwiftABIInfo::shouldPassIndirectly(ArrayRef ComponentTys, - bool AsReturnValue) const { - return occupiesMoreThan(ComponentTys, /*total=*/4); -} - -bool SwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, - unsigned NumElts) const { - // The default implementation of this assumes that the target guarantees - // 128-bit SIMD support but nothing more. - return (VectorSize.getQuantity() > 8 && VectorSize.getQuantity() <= 16); -} - -static CGCXXABI::RecordArgABI getRecordArgABI(const RecordType *RT, - CGCXXABI &CXXABI) { - const CXXRecordDecl *RD = dyn_cast(RT->getDecl()); - if (!RD) { - if (!RT->getDecl()->canPassInRegisters()) - return CGCXXABI::RAA_Indirect; - return CGCXXABI::RAA_Default; - } - return CXXABI.getRecordArgABI(RD); -} - -static CGCXXABI::RecordArgABI getRecordArgABI(QualType T, - CGCXXABI &CXXABI) { - const RecordType *RT = T->getAs(); - if (!RT) - return CGCXXABI::RAA_Default; - return getRecordArgABI(RT, CXXABI); -} - -static bool classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI, - const ABIInfo &Info) { - QualType Ty = FI.getReturnType(); - - if (const auto *RT = Ty->getAs()) - if (!isa(RT->getDecl()) && - !RT->getDecl()->canPassInRegisters()) { - FI.getReturnInfo() = Info.getNaturalAlignIndirect(Ty); - return true; - } - - return CXXABI.classifyReturnType(FI); -} - -/// Pass transparent unions as if they were the type of the first element. Sema -/// should ensure that all elements of the union have the same "machine type". -static QualType useFirstFieldIfTransparentUnion(QualType Ty) { - if (const RecordType *UT = Ty->getAsUnionType()) { - const RecordDecl *UD = UT->getDecl(); - if (UD->hasAttr()) { - assert(!UD->field_empty() && "sema created an empty transparent union"); - return UD->field_begin()->getType(); - } - } - return Ty; -} - -CGCXXABI &ABIInfo::getCXXABI() const { - return CGT.getCXXABI(); -} - -ASTContext &ABIInfo::getContext() const { - return CGT.getContext(); -} - -llvm::LLVMContext &ABIInfo::getVMContext() const { - return CGT.getLLVMContext(); -} - -const llvm::DataLayout &ABIInfo::getDataLayout() const { - return CGT.getDataLayout(); -} - -const TargetInfo &ABIInfo::getTarget() const { - return CGT.getTarget(); -} - -const CodeGenOptions &ABIInfo::getCodeGenOpts() const { - return CGT.getCodeGenOpts(); -} - -bool ABIInfo::isAndroid() const { return getTarget().getTriple().isAndroid(); } - -bool ABIInfo::isOHOSFamily() const { - return getTarget().getTriple().isOHOSFamily(); -} - -bool ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { - return false; -} - -bool ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base, - uint64_t Members) const { - return false; -} - -bool ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const { - // For compatibility with GCC, ignore empty bitfields in C++ mode. - return getContext().getLangOpts().CPlusPlus; -} - LLVM_DUMP_METHOD void ABIArgInfo::dump() const { raw_ostream &OS = llvm::errs(); OS << "(ABIArgInfo Kind="; @@ -295,169 +66,6 @@ OS << ")\n"; } -// Dynamically round a pointer up to a multiple of the given alignment. -static llvm::Value *emitRoundPointerUpToAlignment(CodeGenFunction &CGF, - llvm::Value *Ptr, - CharUnits Align) { - // OverflowArgArea = (OverflowArgArea + Align - 1) & -Align; - llvm::Value *RoundUp = CGF.Builder.CreateConstInBoundsGEP1_32( - CGF.Builder.getInt8Ty(), Ptr, Align.getQuantity() - 1); - return CGF.Builder.CreateIntrinsic( - llvm::Intrinsic::ptrmask, {CGF.AllocaInt8PtrTy, CGF.IntPtrTy}, - {RoundUp, llvm::ConstantInt::get(CGF.IntPtrTy, -Align.getQuantity())}, - nullptr, Ptr->getName() + ".aligned"); -} - -/// Emit va_arg for a platform using the common void* representation, -/// where arguments are simply emitted in an array of slots on the stack. -/// -/// This version implements the core direct-value passing rules. -/// -/// \param SlotSize - The size and alignment of a stack slot. -/// Each argument will be allocated to a multiple of this number of -/// slots, and all the slots will be aligned to this value. -/// \param AllowHigherAlign - The slot alignment is not a cap; -/// an argument type with an alignment greater than the slot size -/// will be emitted on a higher-alignment address, potentially -/// leaving one or more empty slots behind as padding. If this -/// is false, the returned address might be less-aligned than -/// DirectAlign. -/// \param ForceRightAdjust - Default is false. On big-endian platform and -/// if the argument is smaller than a slot, set this flag will force -/// right-adjust the argument in its slot irrespective of the type. -static Address emitVoidPtrDirectVAArg(CodeGenFunction &CGF, - Address VAListAddr, - llvm::Type *DirectTy, - CharUnits DirectSize, - CharUnits DirectAlign, - CharUnits SlotSize, - bool AllowHigherAlign, - bool ForceRightAdjust = false) { - // Cast the element type to i8* if necessary. Some platforms define - // va_list as a struct containing an i8* instead of just an i8*. - if (VAListAddr.getElementType() != CGF.Int8PtrTy) - VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy); - - llvm::Value *Ptr = CGF.Builder.CreateLoad(VAListAddr, "argp.cur"); - - // If the CC aligns values higher than the slot size, do so if needed. - Address Addr = Address::invalid(); - if (AllowHigherAlign && DirectAlign > SlotSize) { - Addr = Address(emitRoundPointerUpToAlignment(CGF, Ptr, DirectAlign), - CGF.Int8Ty, DirectAlign); - } else { - Addr = Address(Ptr, CGF.Int8Ty, SlotSize); - } - - // Advance the pointer past the argument, then store that back. - CharUnits FullDirectSize = DirectSize.alignTo(SlotSize); - Address NextPtr = - CGF.Builder.CreateConstInBoundsByteGEP(Addr, FullDirectSize, "argp.next"); - CGF.Builder.CreateStore(NextPtr.getPointer(), VAListAddr); - - // If the argument is smaller than a slot, and this is a big-endian - // target, the argument will be right-adjusted in its slot. - if (DirectSize < SlotSize && CGF.CGM.getDataLayout().isBigEndian() && - (!DirectTy->isStructTy() || ForceRightAdjust)) { - Addr = CGF.Builder.CreateConstInBoundsByteGEP(Addr, SlotSize - DirectSize); - } - - Addr = CGF.Builder.CreateElementBitCast(Addr, DirectTy); - return Addr; -} - -/// Emit va_arg for a platform using the common void* representation, -/// where arguments are simply emitted in an array of slots on the stack. -/// -/// \param IsIndirect - Values of this type are passed indirectly. -/// \param ValueInfo - The size and alignment of this type, generally -/// computed with getContext().getTypeInfoInChars(ValueTy). -/// \param SlotSizeAndAlign - The size and alignment of a stack slot. -/// Each argument will be allocated to a multiple of this number of -/// slots, and all the slots will be aligned to this value. -/// \param AllowHigherAlign - The slot alignment is not a cap; -/// an argument type with an alignment greater than the slot size -/// will be emitted on a higher-alignment address, potentially -/// leaving one or more empty slots behind as padding. -/// \param ForceRightAdjust - Default is false. On big-endian platform and -/// if the argument is smaller than a slot, set this flag will force -/// right-adjust the argument in its slot irrespective of the type. -static Address emitVoidPtrVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType ValueTy, bool IsIndirect, - TypeInfoChars ValueInfo, - CharUnits SlotSizeAndAlign, - bool AllowHigherAlign, - bool ForceRightAdjust = false) { - // The size and alignment of the value that was passed directly. - CharUnits DirectSize, DirectAlign; - if (IsIndirect) { - DirectSize = CGF.getPointerSize(); - DirectAlign = CGF.getPointerAlign(); - } else { - DirectSize = ValueInfo.Width; - DirectAlign = ValueInfo.Align; - } - - // Cast the address we've calculated to the right type. - llvm::Type *DirectTy = CGF.ConvertTypeForMem(ValueTy), *ElementTy = DirectTy; - if (IsIndirect) { - unsigned AllocaAS = CGF.CGM.getDataLayout().getAllocaAddrSpace(); - DirectTy = llvm::PointerType::get(CGF.getLLVMContext(), AllocaAS); - } - - Address Addr = emitVoidPtrDirectVAArg(CGF, VAListAddr, DirectTy, DirectSize, - DirectAlign, SlotSizeAndAlign, - AllowHigherAlign, ForceRightAdjust); - - if (IsIndirect) { - Addr = Address(CGF.Builder.CreateLoad(Addr), ElementTy, ValueInfo.Align); - } - - return Addr; -} - -static Address complexTempStructure(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty, CharUnits SlotSize, - CharUnits EltSize, const ComplexType *CTy) { - Address Addr = - emitVoidPtrDirectVAArg(CGF, VAListAddr, CGF.Int8Ty, SlotSize * 2, - SlotSize, SlotSize, /*AllowHigher*/ true); - - Address RealAddr = Addr; - Address ImagAddr = RealAddr; - if (CGF.CGM.getDataLayout().isBigEndian()) { - RealAddr = - CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize - EltSize); - ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(ImagAddr, - 2 * SlotSize - EltSize); - } else { - ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize); - } - - llvm::Type *EltTy = CGF.ConvertTypeForMem(CTy->getElementType()); - RealAddr = CGF.Builder.CreateElementBitCast(RealAddr, EltTy); - ImagAddr = CGF.Builder.CreateElementBitCast(ImagAddr, EltTy); - llvm::Value *Real = CGF.Builder.CreateLoad(RealAddr, ".vareal"); - llvm::Value *Imag = CGF.Builder.CreateLoad(ImagAddr, ".vaimag"); - - Address Temp = CGF.CreateMemTemp(Ty, "vacplx"); - CGF.EmitStoreOfComplex({Real, Imag}, CGF.MakeAddrLValue(Temp, Ty), - /*init*/ true); - return Temp; -} - -static Address emitMergePHI(CodeGenFunction &CGF, - Address Addr1, llvm::BasicBlock *Block1, - Address Addr2, llvm::BasicBlock *Block2, - const llvm::Twine &Name = "") { - assert(Addr1.getType() == Addr2.getType()); - llvm::PHINode *PHI = CGF.Builder.CreatePHI(Addr1.getType(), 2, Name); - PHI->addIncoming(Addr1.getPointer(), Block1); - PHI->addIncoming(Addr2.getPointer(), Block2); - CharUnits Align = std::min(Addr1.getAlignment(), Addr2.getAlignment()); - return Address(PHI, Addr1.getElementType(), Align); -} - TargetCodeGenInfo::TargetCodeGenInfo(std::unique_ptr Info) : Info(std::move(Info)) {} @@ -550,12262 +158,63 @@ return Ctx.getOrInsertSyncScopeID(""); /* default sync scope */ } -static bool isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays); - -/// isEmptyField - Return true iff a the field is "empty", that is it -/// is an unnamed bit-field or an (array of) empty record(s). -static bool isEmptyField(ASTContext &Context, const FieldDecl *FD, - bool AllowArrays) { - if (FD->isUnnamedBitfield()) - return true; - - QualType FT = FD->getType(); - - // Constant arrays of empty records count as empty, strip them off. - // Constant arrays of zero length always count as empty. - bool WasArray = false; - if (AllowArrays) - while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) { - if (AT->getSize() == 0) - return true; - FT = AT->getElementType(); - // The [[no_unique_address]] special case below does not apply to - // arrays of C++ empty records, so we need to remember this fact. - WasArray = true; - } - - const RecordType *RT = FT->getAs(); - if (!RT) - return false; - - // C++ record fields are never empty, at least in the Itanium ABI. - // - // FIXME: We should use a predicate for whether this behavior is true in the - // current ABI. - // - // The exception to the above rule are fields marked with the - // [[no_unique_address]] attribute (since C++20). Those do count as empty - // according to the Itanium ABI. The exception applies only to records, - // not arrays of records, so we must also check whether we stripped off an - // array type above. - if (isa(RT->getDecl()) && - (WasArray || !FD->hasAttr())) - return false; - - return isEmptyRecord(Context, FT, AllowArrays); -} - -/// isEmptyRecord - Return true iff a structure contains only empty -/// fields. Note that a structure with a flexible array member is not -/// considered empty. -static bool isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays) { - const RecordType *RT = T->getAs(); - if (!RT) - return false; - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return false; - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) - for (const auto &I : CXXRD->bases()) - if (!isEmptyRecord(Context, I.getType(), true)) - return false; - - for (const auto *I : RD->fields()) - if (!isEmptyField(Context, I, AllowArrays)) - return false; - return true; +void TargetCodeGenInfo::addStackProbeTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { + if (llvm::Function *Fn = dyn_cast_or_null(GV)) { + if (CGM.getCodeGenOpts().StackProbeSize != 4096) + Fn->addFnAttr("stack-probe-size", + llvm::utostr(CGM.getCodeGenOpts().StackProbeSize)); + if (CGM.getCodeGenOpts().NoStackArgProbe) + Fn->addFnAttr("no-stack-arg-probe"); + } } -/// isSingleElementStruct - Determine if a structure is a "single -/// element struct", i.e. it has exactly one non-empty field or -/// exactly one field which is itself a single element -/// struct. Structures with flexible array members are never -/// considered single element structs. +/// Create an OpenCL kernel for an enqueued block. /// -/// \return The field declaration for the single non-empty field, if -/// it exists. -static const Type *isSingleElementStruct(QualType T, ASTContext &Context) { - const RecordType *RT = T->getAs(); - if (!RT) - return nullptr; - - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return nullptr; - - const Type *Found = nullptr; - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - for (const auto &I : CXXRD->bases()) { - // Ignore empty records. - if (isEmptyRecord(Context, I.getType(), true)) - continue; - - // If we already found an element then this isn't a single-element struct. - if (Found) - return nullptr; - - // If this is non-empty and not a single element struct, the composite - // cannot be a single element struct. - Found = isSingleElementStruct(I.getType(), Context); - if (!Found) - return nullptr; - } - } - - // Check for single element. - for (const auto *FD : RD->fields()) { - QualType FT = FD->getType(); - - // Ignore empty fields. - if (isEmptyField(Context, FD, true)) - continue; - - // If we already found an element then this isn't a single-element - // struct. - if (Found) - return nullptr; +/// The kernel has the same function type as the block invoke function. Its +/// name is the name of the block invoke function postfixed with "_kernel". +/// It simply calls the block invoke function then returns. +llvm::Value *TargetCodeGenInfo::createEnqueuedBlockKernel( + CodeGenFunction &CGF, llvm::Function *Invoke, llvm::Type *BlockTy) const { + auto *InvokeFT = Invoke->getFunctionType(); + auto &C = CGF.getLLVMContext(); + std::string Name = Invoke->getName().str() + "_kernel"; + auto *FT = llvm::FunctionType::get(llvm::Type::getVoidTy(C), + InvokeFT->params(), false); + auto *F = llvm::Function::Create(FT, llvm::GlobalValue::ExternalLinkage, Name, + &CGF.CGM.getModule()); + llvm::CallingConv::ID KernelCC = + CGF.getTypes().ClangCallConvToLLVMCallConv(CallingConv::CC_OpenCLKernel); + F->setCallingConv(KernelCC); - // Treat single element arrays as the element. - while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) { - if (AT->getSize().getZExtValue() != 1) - break; - FT = AT->getElementType(); - } + llvm::AttrBuilder KernelAttrs(C); - if (!isAggregateTypeForABI(FT)) { - Found = FT.getTypePtr(); - } else { - Found = isSingleElementStruct(FT, Context); - if (!Found) - return nullptr; - } - } + // FIXME: This is missing setTargetAttributes + CGF.CGM.addDefaultFunctionDefinitionAttributes(KernelAttrs); + F->addFnAttrs(KernelAttrs); - // We don't consider a struct a single-element struct if it has - // padding beyond the element type. - if (Found && Context.getTypeSize(Found) != Context.getTypeSize(T)) - return nullptr; + auto IP = CGF.Builder.saveIP(); + auto *BB = llvm::BasicBlock::Create(C, "entry", F); + auto &Builder = CGF.Builder; + Builder.SetInsertPoint(BB); + llvm::SmallVector Args(llvm::make_pointer_range(F->args())); + llvm::CallInst *Call = Builder.CreateCall(Invoke, Args); + Call->setCallingConv(Invoke->getCallingConv()); - return Found; + Builder.CreateRetVoid(); + Builder.restoreIP(IP); + return F; } namespace { -Address EmitVAArgInstr(CodeGenFunction &CGF, Address VAListAddr, QualType Ty, - const ABIArgInfo &AI) { - // This default implementation defers to the llvm backend's va_arg - // instruction. It can handle only passing arguments directly - // (typically only handled in the backend for primitive types), or - // aggregates passed indirectly by pointer (NOTE: if the "byval" - // flag has ABI impact in the callee, this implementation cannot - // work.) - - // Only a few cases are covered here at the moment -- those needed - // by the default abi. - llvm::Value *Val; - - if (AI.isIndirect()) { - assert(!AI.getPaddingType() && - "Unexpected PaddingType seen in arginfo in generic VAArg emitter!"); - assert( - !AI.getIndirectRealign() && - "Unexpected IndirectRealign seen in arginfo in generic VAArg emitter!"); - - auto TyInfo = CGF.getContext().getTypeInfoInChars(Ty); - CharUnits TyAlignForABI = TyInfo.Align; - - llvm::Type *ElementTy = CGF.ConvertTypeForMem(Ty); - llvm::Type *BaseTy = llvm::PointerType::getUnqual(ElementTy); - llvm::Value *Addr = - CGF.Builder.CreateVAArg(VAListAddr.getPointer(), BaseTy); - return Address(Addr, ElementTy, TyAlignForABI); - } else { - assert((AI.isDirect() || AI.isExtend()) && - "Unexpected ArgInfo Kind in generic VAArg emitter!"); - - assert(!AI.getInReg() && - "Unexpected InReg seen in arginfo in generic VAArg emitter!"); - assert(!AI.getPaddingType() && - "Unexpected PaddingType seen in arginfo in generic VAArg emitter!"); - assert(!AI.getDirectOffset() && - "Unexpected DirectOffset seen in arginfo in generic VAArg emitter!"); - assert(!AI.getCoerceToType() && - "Unexpected CoerceToType seen in arginfo in generic VAArg emitter!"); - - Address Temp = CGF.CreateMemTemp(Ty, "varet"); - Val = CGF.Builder.CreateVAArg(VAListAddr.getPointer(), - CGF.ConvertTypeForMem(Ty)); - CGF.Builder.CreateStore(Val, Temp); - return Temp; - } -} - -/// DefaultABIInfo - The default implementation for ABI specific -/// details. This implementation provides information which results in -/// self-consistent and sensible LLVM IR generation, but does not -/// conform to any particular ABI. -class DefaultABIInfo : public ABIInfo { -public: - DefaultABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType RetTy) const; - - void computeInfo(CGFunctionInfo &FI) const override { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); - } - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override { - return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty)); - } -}; - class DefaultTargetCodeGenInfo : public TargetCodeGenInfo { public: DefaultTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) : TargetCodeGenInfo(std::make_unique(CGT)) {} }; - -ABIArgInfo DefaultABIInfo::classifyArgumentType(QualType Ty) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - if (isAggregateTypeForABI(Ty)) { - // Records with non-trivial destructors/copy-constructors should not be - // passed by value. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - return getNaturalAlignIndirect(Ty); - } - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - ASTContext &Context = getContext(); - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > - Context.getTypeSize(Context.getTargetInfo().hasInt128Type() - ? Context.Int128Ty - : Context.LongLongTy)) - return getNaturalAlignIndirect(Ty); - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); -} - -ABIArgInfo DefaultABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (isAggregateTypeForABI(RetTy)) - return getNaturalAlignIndirect(RetTy); - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > - getContext().getTypeSize(getContext().getTargetInfo().hasInt128Type() - ? getContext().Int128Ty - : getContext().LongLongTy)) - return getNaturalAlignIndirect(RetTy); - - return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -//===----------------------------------------------------------------------===// -// WebAssembly ABI Implementation -// -// This is a very simple ABI that relies a lot on DefaultABIInfo. -//===----------------------------------------------------------------------===// - -class WebAssemblyABIInfo final : public ABIInfo { - DefaultABIInfo defaultInfo; - WebAssemblyABIKind Kind; - -public: - explicit WebAssemblyABIInfo(CodeGen::CodeGenTypes &CGT, - WebAssemblyABIKind Kind) - : ABIInfo(CGT), defaultInfo(CGT), Kind(Kind) {} - -private: - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType Ty) const; - - // DefaultABIInfo's classifyReturnType and classifyArgumentType are - // non-virtual, but computeInfo and EmitVAArg are virtual, so we - // overload them. - void computeInfo(CGFunctionInfo &FI) const override { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &Arg : FI.arguments()) - Arg.info = classifyArgumentType(Arg.type); - } - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -class WebAssemblyTargetCodeGenInfo final : public TargetCodeGenInfo { -public: - explicit WebAssemblyTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, - WebAssemblyABIKind K) - : TargetCodeGenInfo(std::make_unique(CGT, K)) { - SwiftInfo = - std::make_unique(CGT, /*SwiftErrorInRegister=*/false); - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); - if (const auto *FD = dyn_cast_or_null(D)) { - if (const auto *Attr = FD->getAttr()) { - llvm::Function *Fn = cast(GV); - llvm::AttrBuilder B(GV->getContext()); - B.addAttribute("wasm-import-module", Attr->getImportModule()); - Fn->addFnAttrs(B); - } - if (const auto *Attr = FD->getAttr()) { - llvm::Function *Fn = cast(GV); - llvm::AttrBuilder B(GV->getContext()); - B.addAttribute("wasm-import-name", Attr->getImportName()); - Fn->addFnAttrs(B); - } - if (const auto *Attr = FD->getAttr()) { - llvm::Function *Fn = cast(GV); - llvm::AttrBuilder B(GV->getContext()); - B.addAttribute("wasm-export-name", Attr->getExportName()); - Fn->addFnAttrs(B); - } - } - - if (auto *FD = dyn_cast_or_null(D)) { - llvm::Function *Fn = cast(GV); - if (!FD->doesThisDeclarationHaveABody() && !FD->hasPrototype()) - Fn->addFnAttr("no-prototype"); - } - } - - /// Return the WebAssembly externref reference type. - virtual llvm::Type *getWasmExternrefReferenceType() const override { - return llvm::Type::getWasm_ExternrefTy(getABIInfo().getVMContext()); - } - /// Return the WebAssembly funcref reference type. - virtual llvm::Type *getWasmFuncrefReferenceType() const override { - return llvm::Type::getWasm_FuncrefTy(getABIInfo().getVMContext()); - } -}; - -/// Classify argument of given type \p Ty. -ABIArgInfo WebAssemblyABIInfo::classifyArgumentType(QualType Ty) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - if (isAggregateTypeForABI(Ty)) { - // Records with non-trivial destructors/copy-constructors should not be - // passed by value. - if (auto RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - // Lower single-element structs to just pass a regular value. TODO: We - // could do reasonable-size multiple-element structs too, using getExpand(), - // though watch out for things like bitfields. - if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) - return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); - // For the experimental multivalue ABI, fully expand all other aggregates - if (Kind == WebAssemblyABIKind::ExperimentalMV) { - const RecordType *RT = Ty->getAs(); - assert(RT); - bool HasBitField = false; - for (auto *Field : RT->getDecl()->fields()) { - if (Field->isBitField()) { - HasBitField = true; - break; - } - } - if (!HasBitField) - return ABIArgInfo::getExpand(); - } - } - - // Otherwise just do the default thing. - return defaultInfo.classifyArgumentType(Ty); -} - -ABIArgInfo WebAssemblyABIInfo::classifyReturnType(QualType RetTy) const { - if (isAggregateTypeForABI(RetTy)) { - // Records with non-trivial destructors/copy-constructors should not be - // returned by value. - if (!getRecordArgABI(RetTy, getCXXABI())) { - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), RetTy, true)) - return ABIArgInfo::getIgnore(); - // Lower single-element structs to just return a regular value. TODO: We - // could do reasonable-size multiple-element structs too, using - // ABIArgInfo::getDirect(). - if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext())) - return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); - // For the experimental multivalue ABI, return all other aggregates - if (Kind == WebAssemblyABIKind::ExperimentalMV) - return ABIArgInfo::getDirect(); - } - } - - // Otherwise just do the default thing. - return defaultInfo.classifyReturnType(RetTy); -} - -Address WebAssemblyABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - bool IsIndirect = isAggregateTypeForABI(Ty) && - !isEmptyRecord(getContext(), Ty, true) && - !isSingleElementStruct(Ty, getContext()); - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, - getContext().getTypeInfoInChars(Ty), - CharUnits::fromQuantity(4), - /*AllowHigherAlign=*/true); -} - -//===----------------------------------------------------------------------===// -// le32/PNaCl bitcode ABI Implementation -// -// This is a simplified version of the x86_32 ABI. Arguments and return values -// are always passed on the stack. -//===----------------------------------------------------------------------===// - -class PNaClABIInfo : public ABIInfo { - public: - PNaClABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType RetTy) const; - - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, - Address VAListAddr, QualType Ty) const override; -}; - -class PNaClTargetCodeGenInfo : public TargetCodeGenInfo { - public: - PNaClTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} -}; - -void PNaClABIInfo::computeInfo(CGFunctionInfo &FI) const { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); -} - -Address PNaClABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - // The PNaCL ABI is a bit odd, in that varargs don't use normal - // function classification. Structs get passed directly for varargs - // functions, through a rewriting transform in - // pnacl-llvm/lib/Transforms/NaCl/ExpandVarArgs.cpp, which allows - // this target to actually support a va_arg instructions with an - // aggregate type, unlike other targets. - return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect()); -} - -/// Classify argument of given type \p Ty. -ABIArgInfo PNaClABIInfo::classifyArgumentType(QualType Ty) const { - if (isAggregateTypeForABI(Ty)) { - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - return getNaturalAlignIndirect(Ty); - } else if (const EnumType *EnumTy = Ty->getAs()) { - // Treat an enum type as its underlying type. - Ty = EnumTy->getDecl()->getIntegerType(); - } else if (Ty->isFloatingType()) { - // Floating-point types don't go inreg. - return ABIArgInfo::getDirect(); - } else if (const auto *EIT = Ty->getAs()) { - // Treat bit-precise integers as integers if <= 64, otherwise pass - // indirectly. - if (EIT->getNumBits() > 64) - return getNaturalAlignIndirect(Ty); - return ABIArgInfo::getDirect(); - } - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); -} - -ABIArgInfo PNaClABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - // In the PNaCl ABI we always return records/structures on the stack. - if (isAggregateTypeForABI(RetTy)) - return getNaturalAlignIndirect(RetTy); - - // Treat bit-precise integers as integers if <= 64, otherwise pass indirectly. - if (const auto *EIT = RetTy->getAs()) { - if (EIT->getNumBits() > 64) - return getNaturalAlignIndirect(RetTy); - return ABIArgInfo::getDirect(); - } - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -/// IsX86_MMXType - Return true if this is an MMX type. -bool IsX86_MMXType(llvm::Type *IRType) { - // Return true if the type is an MMX type <2 x i32>, <4 x i16>, or <8 x i8>. - return IRType->isVectorTy() && IRType->getPrimitiveSizeInBits() == 64 && - cast(IRType)->getElementType()->isIntegerTy() && - IRType->getScalarSizeInBits() != 64; -} - -static llvm::Type* X86AdjustInlineAsmType(CodeGen::CodeGenFunction &CGF, - StringRef Constraint, - llvm::Type* Ty) { - bool IsMMXCons = llvm::StringSwitch(Constraint) - .Cases("y", "&y", "^Ym", true) - .Default(false); - if (IsMMXCons && Ty->isVectorTy()) { - if (cast(Ty)->getPrimitiveSizeInBits().getFixedValue() != - 64) { - // Invalid MMX constraint - return nullptr; - } - - return llvm::Type::getX86_MMXTy(CGF.getLLVMContext()); - } - - // No operation needed - return Ty; -} - -/// Returns true if this type can be passed in SSE registers with the -/// X86_VectorCall calling convention. Shared between x86_32 and x86_64. -static bool isX86VectorTypeForVectorCall(ASTContext &Context, QualType Ty) { - if (const BuiltinType *BT = Ty->getAs()) { - if (BT->isFloatingPoint() && BT->getKind() != BuiltinType::Half) { - if (BT->getKind() == BuiltinType::LongDouble) { - if (&Context.getTargetInfo().getLongDoubleFormat() == - &llvm::APFloat::x87DoubleExtended()) - return false; - } - return true; - } - } else if (const VectorType *VT = Ty->getAs()) { - // vectorcall can pass XMM, YMM, and ZMM vectors. We don't pass SSE1 MMX - // registers specially. - unsigned VecSize = Context.getTypeSize(VT); - if (VecSize == 128 || VecSize == 256 || VecSize == 512) - return true; - } - return false; -} - -/// Returns true if this aggregate is small enough to be passed in SSE registers -/// in the X86_VectorCall calling convention. Shared between x86_32 and x86_64. -static bool isX86VectorCallAggregateSmallEnough(uint64_t NumMembers) { - return NumMembers <= 4; -} - -/// Returns a Homogeneous Vector Aggregate ABIArgInfo, used in X86. -static ABIArgInfo getDirectX86Hva(llvm::Type* T = nullptr) { - auto AI = ABIArgInfo::getDirect(T); - AI.setInReg(true); - AI.setCanBeFlattened(false); - return AI; -} - -//===----------------------------------------------------------------------===// -// X86-32 ABI Implementation -//===----------------------------------------------------------------------===// - -/// Similar to llvm::CCState, but for Clang. -struct CCState { - CCState(CGFunctionInfo &FI) - : IsPreassigned(FI.arg_size()), CC(FI.getCallingConvention()) {} - - llvm::SmallBitVector IsPreassigned; - unsigned CC = CallingConv::CC_C; - unsigned FreeRegs = 0; - unsigned FreeSSERegs = 0; -}; - -/// X86_32ABIInfo - The X86-32 ABI information. -class X86_32ABIInfo : public ABIInfo { - enum Class { - Integer, - Float - }; - - static const unsigned MinABIStackAlignInBytes = 4; - - bool IsDarwinVectorABI; - bool IsRetSmallStructInRegABI; - bool IsWin32StructABI; - bool IsSoftFloatABI; - bool IsMCUABI; - bool IsLinuxABI; - unsigned DefaultNumRegisterParameters; - - static bool isRegisterSize(unsigned Size) { - return (Size == 8 || Size == 16 || Size == 32 || Size == 64); - } - - bool isHomogeneousAggregateBaseType(QualType Ty) const override { - // FIXME: Assumes vectorcall is in use. - return isX86VectorTypeForVectorCall(getContext(), Ty); - } - - bool isHomogeneousAggregateSmallEnough(const Type *Ty, - uint64_t NumMembers) const override { - // FIXME: Assumes vectorcall is in use. - return isX86VectorCallAggregateSmallEnough(NumMembers); - } - - bool shouldReturnTypeInRegister(QualType Ty, ASTContext &Context) const; - - /// getIndirectResult - Give a source type \arg Ty, return a suitable result - /// such that the argument will be passed in memory. - ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const; - - ABIArgInfo getIndirectReturnResult(QualType Ty, CCState &State) const; - - /// Return the alignment to use for the given type on the stack. - unsigned getTypeStackAlignInBytes(QualType Ty, unsigned Align) const; - - Class classify(QualType Ty) const; - ABIArgInfo classifyReturnType(QualType RetTy, CCState &State) const; - ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const; - - /// Updates the number of available free registers, returns - /// true if any registers were allocated. - bool updateFreeRegs(QualType Ty, CCState &State) const; - - bool shouldAggregateUseDirect(QualType Ty, CCState &State, bool &InReg, - bool &NeedsPadding) const; - bool shouldPrimitiveUseInReg(QualType Ty, CCState &State) const; - - bool canExpandIndirectArgument(QualType Ty) const; - - /// Rewrite the function info so that all memory arguments use - /// inalloca. - void rewriteWithInAlloca(CGFunctionInfo &FI) const; - - void addFieldToArgStruct(SmallVector &FrameFields, - CharUnits &StackOffset, ABIArgInfo &Info, - QualType Type) const; - void runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const; - -public: - - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - X86_32ABIInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI, - bool RetSmallStructInRegABI, bool Win32StructABI, - unsigned NumRegisterParameters, bool SoftFloatABI) - : ABIInfo(CGT), IsDarwinVectorABI(DarwinVectorABI), - IsRetSmallStructInRegABI(RetSmallStructInRegABI), - IsWin32StructABI(Win32StructABI), IsSoftFloatABI(SoftFloatABI), - IsMCUABI(CGT.getTarget().getTriple().isOSIAMCU()), - IsLinuxABI(CGT.getTarget().getTriple().isOSLinux() || - CGT.getTarget().getTriple().isOSCygMing()), - DefaultNumRegisterParameters(NumRegisterParameters) {} -}; - -class X86_32SwiftABIInfo : public SwiftABIInfo { -public: - explicit X86_32SwiftABIInfo(CodeGenTypes &CGT) - : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/false) {} - - bool shouldPassIndirectly(ArrayRef ComponentTys, - bool AsReturnValue) const override { - // LLVM's x86-32 lowering currently only assigns up to three - // integer registers and three fp registers. Oddly, it'll use up to - // four vector registers for vectors, but those can overlap with the - // scalar registers. - return occupiesMoreThan(ComponentTys, /*total=*/3); - } -}; - -class X86_32TargetCodeGenInfo : public TargetCodeGenInfo { -public: - X86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI, - bool RetSmallStructInRegABI, bool Win32StructABI, - unsigned NumRegisterParameters, bool SoftFloatABI) - : TargetCodeGenInfo(std::make_unique( - CGT, DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI, - NumRegisterParameters, SoftFloatABI)) { - SwiftInfo = std::make_unique(CGT); - } - - static bool isStructReturnInRegABI( - const llvm::Triple &Triple, const CodeGenOptions &Opts); - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override; - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { - // Darwin uses different dwarf register numbers for EH. - if (CGM.getTarget().getTriple().isOSDarwin()) return 5; - return 4; - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; - - llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF, - StringRef Constraint, - llvm::Type* Ty) const override { - return X86AdjustInlineAsmType(CGF, Constraint, Ty); - } - - void addReturnRegisterOutputs(CodeGenFunction &CGF, LValue ReturnValue, - std::string &Constraints, - std::vector &ResultRegTypes, - std::vector &ResultTruncRegTypes, - std::vector &ResultRegDests, - std::string &AsmString, - unsigned NumOutputs) const override; - - StringRef getARCRetainAutoreleasedReturnValueMarker() const override { - return "movl\t%ebp, %ebp" - "\t\t// marker for objc_retainAutoreleaseReturnValue"; - } -}; - -} - -/// Rewrite input constraint references after adding some output constraints. -/// In the case where there is one output and one input and we add one output, -/// we need to replace all operand references greater than or equal to 1: -/// mov $0, $1 -/// mov eax, $1 -/// The result will be: -/// mov $0, $2 -/// mov eax, $2 -static void rewriteInputConstraintReferences(unsigned FirstIn, - unsigned NumNewOuts, - std::string &AsmString) { - std::string Buf; - llvm::raw_string_ostream OS(Buf); - size_t Pos = 0; - while (Pos < AsmString.size()) { - size_t DollarStart = AsmString.find('$', Pos); - if (DollarStart == std::string::npos) - DollarStart = AsmString.size(); - size_t DollarEnd = AsmString.find_first_not_of('$', DollarStart); - if (DollarEnd == std::string::npos) - DollarEnd = AsmString.size(); - OS << StringRef(&AsmString[Pos], DollarEnd - Pos); - Pos = DollarEnd; - size_t NumDollars = DollarEnd - DollarStart; - if (NumDollars % 2 != 0 && Pos < AsmString.size()) { - // We have an operand reference. - size_t DigitStart = Pos; - if (AsmString[DigitStart] == '{') { - OS << '{'; - ++DigitStart; - } - size_t DigitEnd = AsmString.find_first_not_of("0123456789", DigitStart); - if (DigitEnd == std::string::npos) - DigitEnd = AsmString.size(); - StringRef OperandStr(&AsmString[DigitStart], DigitEnd - DigitStart); - unsigned OperandIndex; - if (!OperandStr.getAsInteger(10, OperandIndex)) { - if (OperandIndex >= FirstIn) - OperandIndex += NumNewOuts; - OS << OperandIndex; - } else { - OS << OperandStr; - } - Pos = DigitEnd; - } - } - AsmString = std::move(OS.str()); -} - -/// Add output constraints for EAX:EDX because they are return registers. -void X86_32TargetCodeGenInfo::addReturnRegisterOutputs( - CodeGenFunction &CGF, LValue ReturnSlot, std::string &Constraints, - std::vector &ResultRegTypes, - std::vector &ResultTruncRegTypes, - std::vector &ResultRegDests, std::string &AsmString, - unsigned NumOutputs) const { - uint64_t RetWidth = CGF.getContext().getTypeSize(ReturnSlot.getType()); - - // Use the EAX constraint if the width is 32 or smaller and EAX:EDX if it is - // larger. - if (!Constraints.empty()) - Constraints += ','; - if (RetWidth <= 32) { - Constraints += "={eax}"; - ResultRegTypes.push_back(CGF.Int32Ty); - } else { - // Use the 'A' constraint for EAX:EDX. - Constraints += "=A"; - ResultRegTypes.push_back(CGF.Int64Ty); - } - - // Truncate EAX or EAX:EDX to an integer of the appropriate size. - llvm::Type *CoerceTy = llvm::IntegerType::get(CGF.getLLVMContext(), RetWidth); - ResultTruncRegTypes.push_back(CoerceTy); - - // Coerce the integer by bitcasting the return slot pointer. - ReturnSlot.setAddress( - CGF.Builder.CreateElementBitCast(ReturnSlot.getAddress(CGF), CoerceTy)); - ResultRegDests.push_back(ReturnSlot); - - rewriteInputConstraintReferences(NumOutputs, 1, AsmString); -} - -/// shouldReturnTypeInRegister - Determine if the given type should be -/// returned in a register (for the Darwin and MCU ABI). -bool X86_32ABIInfo::shouldReturnTypeInRegister(QualType Ty, - ASTContext &Context) const { - uint64_t Size = Context.getTypeSize(Ty); - - // For i386, type must be register sized. - // For the MCU ABI, it only needs to be <= 8-byte - if ((IsMCUABI && Size > 64) || (!IsMCUABI && !isRegisterSize(Size))) - return false; - - if (Ty->isVectorType()) { - // 64- and 128- bit vectors inside structures are not returned in - // registers. - if (Size == 64 || Size == 128) - return false; - - return true; - } - - // If this is a builtin, pointer, enum, complex type, member pointer, or - // member function pointer it is ok. - if (Ty->getAs() || Ty->hasPointerRepresentation() || - Ty->isAnyComplexType() || Ty->isEnumeralType() || - Ty->isBlockPointerType() || Ty->isMemberPointerType()) - return true; - - // Arrays are treated like records. - if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) - return shouldReturnTypeInRegister(AT->getElementType(), Context); - - // Otherwise, it must be a record type. - const RecordType *RT = Ty->getAs(); - if (!RT) return false; - - // FIXME: Traverse bases here too. - - // Structure types are passed in register if all fields would be - // passed in a register. - for (const auto *FD : RT->getDecl()->fields()) { - // Empty fields are ignored. - if (isEmptyField(Context, FD, true)) - continue; - - // Check fields recursively. - if (!shouldReturnTypeInRegister(FD->getType(), Context)) - return false; - } - return true; -} - -static bool is32Or64BitBasicType(QualType Ty, ASTContext &Context) { - // Treat complex types as the element type. - if (const ComplexType *CTy = Ty->getAs()) - Ty = CTy->getElementType(); - - // Check for a type which we know has a simple scalar argument-passing - // convention without any padding. (We're specifically looking for 32 - // and 64-bit integer and integer-equivalents, float, and double.) - if (!Ty->getAs() && !Ty->hasPointerRepresentation() && - !Ty->isEnumeralType() && !Ty->isBlockPointerType()) - return false; - - uint64_t Size = Context.getTypeSize(Ty); - return Size == 32 || Size == 64; -} - -static bool addFieldSizes(ASTContext &Context, const RecordDecl *RD, - uint64_t &Size) { - for (const auto *FD : RD->fields()) { - // Scalar arguments on the stack get 4 byte alignment on x86. If the - // argument is smaller than 32-bits, expanding the struct will create - // alignment padding. - if (!is32Or64BitBasicType(FD->getType(), Context)) - return false; - - // FIXME: Reject bit-fields wholesale; there are two problems, we don't know - // how to expand them yet, and the predicate for telling if a bitfield still - // counts as "basic" is more complicated than what we were doing previously. - if (FD->isBitField()) - return false; - - Size += Context.getTypeSize(FD->getType()); - } - return true; -} - -static bool addBaseAndFieldSizes(ASTContext &Context, const CXXRecordDecl *RD, - uint64_t &Size) { - // Don't do this if there are any non-empty bases. - for (const CXXBaseSpecifier &Base : RD->bases()) { - if (!addBaseAndFieldSizes(Context, Base.getType()->getAsCXXRecordDecl(), - Size)) - return false; - } - if (!addFieldSizes(Context, RD, Size)) - return false; - return true; -} - -/// Test whether an argument type which is to be passed indirectly (on the -/// stack) would have the equivalent layout if it was expanded into separate -/// arguments. If so, we prefer to do the latter to avoid inhibiting -/// optimizations. -bool X86_32ABIInfo::canExpandIndirectArgument(QualType Ty) const { - // We can only expand structure types. - const RecordType *RT = Ty->getAs(); - if (!RT) - return false; - const RecordDecl *RD = RT->getDecl(); - uint64_t Size = 0; - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - if (!IsWin32StructABI) { - // On non-Windows, we have to conservatively match our old bitcode - // prototypes in order to be ABI-compatible at the bitcode level. - if (!CXXRD->isCLike()) - return false; - } else { - // Don't do this for dynamic classes. - if (CXXRD->isDynamicClass()) - return false; - } - if (!addBaseAndFieldSizes(getContext(), CXXRD, Size)) - return false; - } else { - if (!addFieldSizes(getContext(), RD, Size)) - return false; - } - - // We can do this if there was no alignment padding. - return Size == getContext().getTypeSize(Ty); -} - -ABIArgInfo X86_32ABIInfo::getIndirectReturnResult(QualType RetTy, CCState &State) const { - // If the return value is indirect, then the hidden argument is consuming one - // integer register. - if (State.FreeRegs) { - --State.FreeRegs; - if (!IsMCUABI) - return getNaturalAlignIndirectInReg(RetTy); - } - return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); -} - -ABIArgInfo X86_32ABIInfo::classifyReturnType(QualType RetTy, - CCState &State) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - const Type *Base = nullptr; - uint64_t NumElts = 0; - if ((State.CC == llvm::CallingConv::X86_VectorCall || - State.CC == llvm::CallingConv::X86_RegCall) && - isHomogeneousAggregate(RetTy, Base, NumElts)) { - // The LLVM struct type for such an aggregate should lower properly. - return ABIArgInfo::getDirect(); - } - - if (const VectorType *VT = RetTy->getAs()) { - // On Darwin, some vectors are returned in registers. - if (IsDarwinVectorABI) { - uint64_t Size = getContext().getTypeSize(RetTy); - - // 128-bit vectors are a special case; they are returned in - // registers and we need to make sure to pick a type the LLVM - // backend will like. - if (Size == 128) - return ABIArgInfo::getDirect(llvm::FixedVectorType::get( - llvm::Type::getInt64Ty(getVMContext()), 2)); - - // Always return in register if it fits in a general purpose - // register, or if it is 64 bits and has a single element. - if ((Size == 8 || Size == 16 || Size == 32) || - (Size == 64 && VT->getNumElements() == 1)) - return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), - Size)); - - return getIndirectReturnResult(RetTy, State); - } - - return ABIArgInfo::getDirect(); - } - - if (isAggregateTypeForABI(RetTy)) { - if (const RecordType *RT = RetTy->getAs()) { - // Structures with flexible arrays are always indirect. - if (RT->getDecl()->hasFlexibleArrayMember()) - return getIndirectReturnResult(RetTy, State); - } - - // If specified, structs and unions are always indirect. - if (!IsRetSmallStructInRegABI && !RetTy->isAnyComplexType()) - return getIndirectReturnResult(RetTy, State); - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), RetTy, true)) - return ABIArgInfo::getIgnore(); - - // Return complex of _Float16 as <2 x half> so the backend will use xmm0. - if (const ComplexType *CT = RetTy->getAs()) { - QualType ET = getContext().getCanonicalType(CT->getElementType()); - if (ET->isFloat16Type()) - return ABIArgInfo::getDirect(llvm::FixedVectorType::get( - llvm::Type::getHalfTy(getVMContext()), 2)); - } - - // Small structures which are register sized are generally returned - // in a register. - if (shouldReturnTypeInRegister(RetTy, getContext())) { - uint64_t Size = getContext().getTypeSize(RetTy); - - // As a special-case, if the struct is a "single-element" struct, and - // the field is of type "float" or "double", return it in a - // floating-point register. (MSVC does not apply this special case.) - // We apply a similar transformation for pointer types to improve the - // quality of the generated IR. - if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext())) - if ((!IsWin32StructABI && SeltTy->isRealFloatingType()) - || SeltTy->hasPointerRepresentation()) - return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); - - // FIXME: We should be able to narrow this integer in cases with dead - // padding. - return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),Size)); - } - - return getIndirectReturnResult(RetTy, State); - } - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > 64) - return getIndirectReturnResult(RetTy, State); - - return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -static bool isSIMDVectorType(ASTContext &Context, QualType Ty) { - return Ty->getAs() && Context.getTypeSize(Ty) == 128; -} - -static bool isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty) { - const RecordType *RT = Ty->getAs(); - if (!RT) - return false; - const RecordDecl *RD = RT->getDecl(); - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) - for (const auto &I : CXXRD->bases()) - if (!isRecordWithSIMDVectorType(Context, I.getType())) - return false; - - for (const auto *i : RD->fields()) { - QualType FT = i->getType(); - - if (isSIMDVectorType(Context, FT)) - return true; - - if (isRecordWithSIMDVectorType(Context, FT)) - return true; - } - - return false; -} - -unsigned X86_32ABIInfo::getTypeStackAlignInBytes(QualType Ty, - unsigned Align) const { - // Otherwise, if the alignment is less than or equal to the minimum ABI - // alignment, just use the default; the backend will handle this. - if (Align <= MinABIStackAlignInBytes) - return 0; // Use default alignment. - - if (IsLinuxABI) { - // Exclude other System V OS (e.g Darwin, PS4 and FreeBSD) since we don't - // want to spend any effort dealing with the ramifications of ABI breaks. - // - // If the vector type is __m128/__m256/__m512, return the default alignment. - if (Ty->isVectorType() && (Align == 16 || Align == 32 || Align == 64)) - return Align; - } - // On non-Darwin, the stack type alignment is always 4. - if (!IsDarwinVectorABI) { - // Set explicit alignment, since we may need to realign the top. - return MinABIStackAlignInBytes; - } - - // Otherwise, if the type contains an SSE vector type, the alignment is 16. - if (Align >= 16 && (isSIMDVectorType(getContext(), Ty) || - isRecordWithSIMDVectorType(getContext(), Ty))) - return 16; - - return MinABIStackAlignInBytes; -} - -ABIArgInfo X86_32ABIInfo::getIndirectResult(QualType Ty, bool ByVal, - CCState &State) const { - if (!ByVal) { - if (State.FreeRegs) { - --State.FreeRegs; // Non-byval indirects just use one pointer. - if (!IsMCUABI) - return getNaturalAlignIndirectInReg(Ty); - } - return getNaturalAlignIndirect(Ty, false); - } - - // Compute the byval alignment. - unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8; - unsigned StackAlign = getTypeStackAlignInBytes(Ty, TypeAlign); - if (StackAlign == 0) - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true); - - // If the stack alignment is less than the type alignment, realign the - // argument. - bool Realign = TypeAlign > StackAlign; - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(StackAlign), - /*ByVal=*/true, Realign); -} - -X86_32ABIInfo::Class X86_32ABIInfo::classify(QualType Ty) const { - const Type *T = isSingleElementStruct(Ty, getContext()); - if (!T) - T = Ty.getTypePtr(); - - if (const BuiltinType *BT = T->getAs()) { - BuiltinType::Kind K = BT->getKind(); - if (K == BuiltinType::Float || K == BuiltinType::Double) - return Float; - } - return Integer; -} - -bool X86_32ABIInfo::updateFreeRegs(QualType Ty, CCState &State) const { - if (!IsSoftFloatABI) { - Class C = classify(Ty); - if (C == Float) - return false; - } - - unsigned Size = getContext().getTypeSize(Ty); - unsigned SizeInRegs = (Size + 31) / 32; - - if (SizeInRegs == 0) - return false; - - if (!IsMCUABI) { - if (SizeInRegs > State.FreeRegs) { - State.FreeRegs = 0; - return false; - } - } else { - // The MCU psABI allows passing parameters in-reg even if there are - // earlier parameters that are passed on the stack. Also, - // it does not allow passing >8-byte structs in-register, - // even if there are 3 free registers available. - if (SizeInRegs > State.FreeRegs || SizeInRegs > 2) - return false; - } - - State.FreeRegs -= SizeInRegs; - return true; -} - -bool X86_32ABIInfo::shouldAggregateUseDirect(QualType Ty, CCState &State, - bool &InReg, - bool &NeedsPadding) const { - // On Windows, aggregates other than HFAs are never passed in registers, and - // they do not consume register slots. Homogenous floating-point aggregates - // (HFAs) have already been dealt with at this point. - if (IsWin32StructABI && isAggregateTypeForABI(Ty)) - return false; - - NeedsPadding = false; - InReg = !IsMCUABI; - - if (!updateFreeRegs(Ty, State)) - return false; - - if (IsMCUABI) - return true; - - if (State.CC == llvm::CallingConv::X86_FastCall || - State.CC == llvm::CallingConv::X86_VectorCall || - State.CC == llvm::CallingConv::X86_RegCall) { - if (getContext().getTypeSize(Ty) <= 32 && State.FreeRegs) - NeedsPadding = true; - - return false; - } - - return true; -} - -bool X86_32ABIInfo::shouldPrimitiveUseInReg(QualType Ty, CCState &State) const { - bool IsPtrOrInt = (getContext().getTypeSize(Ty) <= 32) && - (Ty->isIntegralOrEnumerationType() || Ty->isPointerType() || - Ty->isReferenceType()); - - if (!IsPtrOrInt && (State.CC == llvm::CallingConv::X86_FastCall || - State.CC == llvm::CallingConv::X86_VectorCall)) - return false; - - if (!updateFreeRegs(Ty, State)) - return false; - - if (!IsPtrOrInt && State.CC == llvm::CallingConv::X86_RegCall) - return false; - - // Return true to apply inreg to all legal parameters except for MCU targets. - return !IsMCUABI; -} - -void X86_32ABIInfo::runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const { - // Vectorcall x86 works subtly different than in x64, so the format is - // a bit different than the x64 version. First, all vector types (not HVAs) - // are assigned, with the first 6 ending up in the [XYZ]MM0-5 registers. - // This differs from the x64 implementation, where the first 6 by INDEX get - // registers. - // In the second pass over the arguments, HVAs are passed in the remaining - // vector registers if possible, or indirectly by address. The address will be - // passed in ECX/EDX if available. Any other arguments are passed according to - // the usual fastcall rules. - MutableArrayRef Args = FI.arguments(); - for (int I = 0, E = Args.size(); I < E; ++I) { - const Type *Base = nullptr; - uint64_t NumElts = 0; - const QualType &Ty = Args[I].type; - if ((Ty->isVectorType() || Ty->isBuiltinType()) && - isHomogeneousAggregate(Ty, Base, NumElts)) { - if (State.FreeSSERegs >= NumElts) { - State.FreeSSERegs -= NumElts; - Args[I].info = ABIArgInfo::getDirectInReg(); - State.IsPreassigned.set(I); - } - } - } -} - -ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty, - CCState &State) const { - // FIXME: Set alignment on indirect arguments. - bool IsFastCall = State.CC == llvm::CallingConv::X86_FastCall; - bool IsRegCall = State.CC == llvm::CallingConv::X86_RegCall; - bool IsVectorCall = State.CC == llvm::CallingConv::X86_VectorCall; - - Ty = useFirstFieldIfTransparentUnion(Ty); - TypeInfo TI = getContext().getTypeInfo(Ty); - - // Check with the C++ ABI first. - const RecordType *RT = Ty->getAs(); - if (RT) { - CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()); - if (RAA == CGCXXABI::RAA_Indirect) { - return getIndirectResult(Ty, false, State); - } else if (RAA == CGCXXABI::RAA_DirectInMemory) { - // The field index doesn't matter, we'll fix it up later. - return ABIArgInfo::getInAlloca(/*FieldIndex=*/0); - } - } - - // Regcall uses the concept of a homogenous vector aggregate, similar - // to other targets. - const Type *Base = nullptr; - uint64_t NumElts = 0; - if ((IsRegCall || IsVectorCall) && - isHomogeneousAggregate(Ty, Base, NumElts)) { - if (State.FreeSSERegs >= NumElts) { - State.FreeSSERegs -= NumElts; - - // Vectorcall passes HVAs directly and does not flatten them, but regcall - // does. - if (IsVectorCall) - return getDirectX86Hva(); - - if (Ty->isBuiltinType() || Ty->isVectorType()) - return ABIArgInfo::getDirect(); - return ABIArgInfo::getExpand(); - } - return getIndirectResult(Ty, /*ByVal=*/false, State); - } - - if (isAggregateTypeForABI(Ty)) { - // Structures with flexible arrays are always indirect. - // FIXME: This should not be byval! - if (RT && RT->getDecl()->hasFlexibleArrayMember()) - return getIndirectResult(Ty, true, State); - - // Ignore empty structs/unions on non-Windows. - if (!IsWin32StructABI && isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - llvm::LLVMContext &LLVMContext = getVMContext(); - llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext); - bool NeedsPadding = false; - bool InReg; - if (shouldAggregateUseDirect(Ty, State, InReg, NeedsPadding)) { - unsigned SizeInRegs = (TI.Width + 31) / 32; - SmallVector Elements(SizeInRegs, Int32); - llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements); - if (InReg) - return ABIArgInfo::getDirectInReg(Result); - else - return ABIArgInfo::getDirect(Result); - } - llvm::IntegerType *PaddingType = NeedsPadding ? Int32 : nullptr; - - // Pass over-aligned aggregates on Windows indirectly. This behavior was - // added in MSVC 2015. Use the required alignment from the record layout, - // since that may be less than the regular type alignment, and types with - // required alignment of less than 4 bytes are not passed indirectly. - if (IsWin32StructABI) { - unsigned AlignInBits = 0; - if (RT) { - const ASTRecordLayout &Layout = - getContext().getASTRecordLayout(RT->getDecl()); - AlignInBits = getContext().toBits(Layout.getRequiredAlignment()); - } else if (TI.isAlignRequired()) { - AlignInBits = TI.Align; - } - if (AlignInBits > 32) - return getIndirectResult(Ty, /*ByVal=*/false, State); - } - - // Expand small (<= 128-bit) record types when we know that the stack layout - // of those arguments will match the struct. This is important because the - // LLVM backend isn't smart enough to remove byval, which inhibits many - // optimizations. - // Don't do this for the MCU if there are still free integer registers - // (see X86_64 ABI for full explanation). - if (TI.Width <= 4 * 32 && (!IsMCUABI || State.FreeRegs == 0) && - canExpandIndirectArgument(Ty)) - return ABIArgInfo::getExpandWithPadding( - IsFastCall || IsVectorCall || IsRegCall, PaddingType); - - return getIndirectResult(Ty, true, State); - } - - if (const VectorType *VT = Ty->getAs()) { - // On Windows, vectors are passed directly if registers are available, or - // indirectly if not. This avoids the need to align argument memory. Pass - // user-defined vector types larger than 512 bits indirectly for simplicity. - if (IsWin32StructABI) { - if (TI.Width <= 512 && State.FreeSSERegs > 0) { - --State.FreeSSERegs; - return ABIArgInfo::getDirectInReg(); - } - return getIndirectResult(Ty, /*ByVal=*/false, State); - } - - // On Darwin, some vectors are passed in memory, we handle this by passing - // it as an i8/i16/i32/i64. - if (IsDarwinVectorABI) { - if ((TI.Width == 8 || TI.Width == 16 || TI.Width == 32) || - (TI.Width == 64 && VT->getNumElements() == 1)) - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), TI.Width)); - } - - if (IsX86_MMXType(CGT.ConvertType(Ty))) - return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), 64)); - - return ABIArgInfo::getDirect(); - } - - - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - bool InReg = shouldPrimitiveUseInReg(Ty, State); - - if (isPromotableIntegerTypeForABI(Ty)) { - if (InReg) - return ABIArgInfo::getExtendInReg(Ty); - return ABIArgInfo::getExtend(Ty); - } - - if (const auto *EIT = Ty->getAs()) { - if (EIT->getNumBits() <= 64) { - if (InReg) - return ABIArgInfo::getDirectInReg(); - return ABIArgInfo::getDirect(); - } - return getIndirectResult(Ty, /*ByVal=*/false, State); - } - - if (InReg) - return ABIArgInfo::getDirectInReg(); - return ABIArgInfo::getDirect(); -} - -void X86_32ABIInfo::computeInfo(CGFunctionInfo &FI) const { - CCState State(FI); - if (IsMCUABI) - State.FreeRegs = 3; - else if (State.CC == llvm::CallingConv::X86_FastCall) { - State.FreeRegs = 2; - State.FreeSSERegs = 3; - } else if (State.CC == llvm::CallingConv::X86_VectorCall) { - State.FreeRegs = 2; - State.FreeSSERegs = 6; - } else if (FI.getHasRegParm()) - State.FreeRegs = FI.getRegParm(); - else if (State.CC == llvm::CallingConv::X86_RegCall) { - State.FreeRegs = 5; - State.FreeSSERegs = 8; - } else if (IsWin32StructABI) { - // Since MSVC 2015, the first three SSE vectors have been passed in - // registers. The rest are passed indirectly. - State.FreeRegs = DefaultNumRegisterParameters; - State.FreeSSERegs = 3; - } else - State.FreeRegs = DefaultNumRegisterParameters; - - if (!::classifyReturnType(getCXXABI(), FI, *this)) { - FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), State); - } else if (FI.getReturnInfo().isIndirect()) { - // The C++ ABI is not aware of register usage, so we have to check if the - // return value was sret and put it in a register ourselves if appropriate. - if (State.FreeRegs) { - --State.FreeRegs; // The sret parameter consumes a register. - if (!IsMCUABI) - FI.getReturnInfo().setInReg(true); - } - } - - // The chain argument effectively gives us another free register. - if (FI.isChainCall()) - ++State.FreeRegs; - - // For vectorcall, do a first pass over the arguments, assigning FP and vector - // arguments to XMM registers as available. - if (State.CC == llvm::CallingConv::X86_VectorCall) - runVectorCallFirstPass(FI, State); - - bool UsedInAlloca = false; - MutableArrayRef Args = FI.arguments(); - for (int I = 0, E = Args.size(); I < E; ++I) { - // Skip arguments that have already been assigned. - if (State.IsPreassigned.test(I)) - continue; - - Args[I].info = classifyArgumentType(Args[I].type, State); - UsedInAlloca |= (Args[I].info.getKind() == ABIArgInfo::InAlloca); - } - - // If we needed to use inalloca for any argument, do a second pass and rewrite - // all the memory arguments to use inalloca. - if (UsedInAlloca) - rewriteWithInAlloca(FI); -} - -void -X86_32ABIInfo::addFieldToArgStruct(SmallVector &FrameFields, - CharUnits &StackOffset, ABIArgInfo &Info, - QualType Type) const { - // Arguments are always 4-byte-aligned. - CharUnits WordSize = CharUnits::fromQuantity(4); - assert(StackOffset.isMultipleOf(WordSize) && "unaligned inalloca struct"); - - // sret pointers and indirect things will require an extra pointer - // indirection, unless they are byval. Most things are byval, and will not - // require this indirection. - bool IsIndirect = false; - if (Info.isIndirect() && !Info.getIndirectByVal()) - IsIndirect = true; - Info = ABIArgInfo::getInAlloca(FrameFields.size(), IsIndirect); - llvm::Type *LLTy = CGT.ConvertTypeForMem(Type); - if (IsIndirect) - LLTy = llvm::PointerType::getUnqual(getVMContext()); - FrameFields.push_back(LLTy); - StackOffset += IsIndirect ? WordSize : getContext().getTypeSizeInChars(Type); - - // Insert padding bytes to respect alignment. - CharUnits FieldEnd = StackOffset; - StackOffset = FieldEnd.alignTo(WordSize); - if (StackOffset != FieldEnd) { - CharUnits NumBytes = StackOffset - FieldEnd; - llvm::Type *Ty = llvm::Type::getInt8Ty(getVMContext()); - Ty = llvm::ArrayType::get(Ty, NumBytes.getQuantity()); - FrameFields.push_back(Ty); - } -} - -static bool isArgInAlloca(const ABIArgInfo &Info) { - // Leave ignored and inreg arguments alone. - switch (Info.getKind()) { - case ABIArgInfo::InAlloca: - return true; - case ABIArgInfo::Ignore: - case ABIArgInfo::IndirectAliased: - return false; - case ABIArgInfo::Indirect: - case ABIArgInfo::Direct: - case ABIArgInfo::Extend: - return !Info.getInReg(); - case ABIArgInfo::Expand: - case ABIArgInfo::CoerceAndExpand: - // These are aggregate types which are never passed in registers when - // inalloca is involved. - return true; - } - llvm_unreachable("invalid enum"); -} - -void X86_32ABIInfo::rewriteWithInAlloca(CGFunctionInfo &FI) const { - assert(IsWin32StructABI && "inalloca only supported on win32"); - - // Build a packed struct type for all of the arguments in memory. - SmallVector FrameFields; - - // The stack alignment is always 4. - CharUnits StackAlign = CharUnits::fromQuantity(4); - - CharUnits StackOffset; - CGFunctionInfo::arg_iterator I = FI.arg_begin(), E = FI.arg_end(); - - // Put 'this' into the struct before 'sret', if necessary. - bool IsThisCall = - FI.getCallingConvention() == llvm::CallingConv::X86_ThisCall; - ABIArgInfo &Ret = FI.getReturnInfo(); - if (Ret.isIndirect() && Ret.isSRetAfterThis() && !IsThisCall && - isArgInAlloca(I->info)) { - addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type); - ++I; - } - - // Put the sret parameter into the inalloca struct if it's in memory. - if (Ret.isIndirect() && !Ret.getInReg()) { - addFieldToArgStruct(FrameFields, StackOffset, Ret, FI.getReturnType()); - // On Windows, the hidden sret parameter is always returned in eax. - Ret.setInAllocaSRet(IsWin32StructABI); - } - - // Skip the 'this' parameter in ecx. - if (IsThisCall) - ++I; - - // Put arguments passed in memory into the struct. - for (; I != E; ++I) { - if (isArgInAlloca(I->info)) - addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type); - } - - FI.setArgStruct(llvm::StructType::get(getVMContext(), FrameFields, - /*isPacked=*/true), - StackAlign); -} - -Address X86_32ABIInfo::EmitVAArg(CodeGenFunction &CGF, - Address VAListAddr, QualType Ty) const { - - auto TypeInfo = getContext().getTypeInfoInChars(Ty); - - // x86-32 changes the alignment of certain arguments on the stack. - // - // Just messing with TypeInfo like this works because we never pass - // anything indirectly. - TypeInfo.Align = CharUnits::fromQuantity( - getTypeStackAlignInBytes(Ty, TypeInfo.Align.getQuantity())); - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, - TypeInfo, CharUnits::fromQuantity(4), - /*AllowHigherAlign*/ true); -} - -bool X86_32TargetCodeGenInfo::isStructReturnInRegABI( - const llvm::Triple &Triple, const CodeGenOptions &Opts) { - assert(Triple.getArch() == llvm::Triple::x86); - - switch (Opts.getStructReturnConvention()) { - case CodeGenOptions::SRCK_Default: - break; - case CodeGenOptions::SRCK_OnStack: // -fpcc-struct-return - return false; - case CodeGenOptions::SRCK_InRegs: // -freg-struct-return - return true; - } - - if (Triple.isOSDarwin() || Triple.isOSIAMCU()) - return true; - - switch (Triple.getOS()) { - case llvm::Triple::DragonFly: - case llvm::Triple::FreeBSD: - case llvm::Triple::OpenBSD: - case llvm::Triple::Win32: - return true; - default: - return false; - } -} - -static void addX86InterruptAttrs(const FunctionDecl *FD, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) { - if (!FD->hasAttr()) - return; - - llvm::Function *Fn = cast(GV); - Fn->setCallingConv(llvm::CallingConv::X86_INTR); - if (FD->getNumParams() == 0) - return; - - auto PtrTy = cast(FD->getParamDecl(0)->getType()); - llvm::Type *ByValTy = CGM.getTypes().ConvertType(PtrTy->getPointeeType()); - llvm::Attribute NewAttr = llvm::Attribute::getWithByValType( - Fn->getContext(), ByValTy); - Fn->addParamAttr(0, NewAttr); -} - -void X86_32TargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { - if (GV->isDeclaration()) - return; - if (const FunctionDecl *FD = dyn_cast_or_null(D)) { - if (FD->hasAttr()) { - llvm::Function *Fn = cast(GV); - Fn->addFnAttr("stackrealign"); - } - - addX86InterruptAttrs(FD, GV, CGM); - } -} - -bool X86_32TargetCodeGenInfo::initDwarfEHRegSizeTable( - CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const { - CodeGen::CGBuilderTy &Builder = CGF.Builder; - - llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4); - - // 0-7 are the eight integer registers; the order is different - // on Darwin (for EH), but the range is the same. - // 8 is %eip. - AssignToArrayRange(Builder, Address, Four8, 0, 8); - - if (CGF.CGM.getTarget().getTriple().isOSDarwin()) { - // 12-16 are st(0..4). Not sure why we stop at 4. - // These have size 16, which is sizeof(long double) on - // platforms with 8-byte alignment for that type. - llvm::Value *Sixteen8 = llvm::ConstantInt::get(CGF.Int8Ty, 16); - AssignToArrayRange(Builder, Address, Sixteen8, 12, 16); - - } else { - // 9 is %eflags, which doesn't get a size on Darwin for some - // reason. - Builder.CreateAlignedStore( - Four8, Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, Address, 9), - CharUnits::One()); - - // 11-16 are st(0..5). Not sure why we stop at 5. - // These have size 12, which is sizeof(long double) on - // platforms with 4-byte alignment for that type. - llvm::Value *Twelve8 = llvm::ConstantInt::get(CGF.Int8Ty, 12); - AssignToArrayRange(Builder, Address, Twelve8, 11, 16); - } - - return false; -} - -//===----------------------------------------------------------------------===// -// X86-64 ABI Implementation -//===----------------------------------------------------------------------===// - - -namespace { - -/// \p returns the size in bits of the largest (native) vector for \p AVXLevel. -static unsigned getNativeVectorSizeForAVXABI(X86AVXABILevel AVXLevel) { - switch (AVXLevel) { - case X86AVXABILevel::AVX512: - return 512; - case X86AVXABILevel::AVX: - return 256; - case X86AVXABILevel::None: - return 128; - } - llvm_unreachable("Unknown AVXLevel"); -} - -/// X86_64ABIInfo - The X86_64 ABI information. -class X86_64ABIInfo : public ABIInfo { - enum Class { - Integer = 0, - SSE, - SSEUp, - X87, - X87Up, - ComplexX87, - NoClass, - Memory - }; - - /// merge - Implement the X86_64 ABI merging algorithm. - /// - /// Merge an accumulating classification \arg Accum with a field - /// classification \arg Field. - /// - /// \param Accum - The accumulating classification. This should - /// always be either NoClass or the result of a previous merge - /// call. In addition, this should never be Memory (the caller - /// should just return Memory for the aggregate). - static Class merge(Class Accum, Class Field); - - /// postMerge - Implement the X86_64 ABI post merging algorithm. - /// - /// Post merger cleanup, reduces a malformed Hi and Lo pair to - /// final MEMORY or SSE classes when necessary. - /// - /// \param AggregateSize - The size of the current aggregate in - /// the classification process. - /// - /// \param Lo - The classification for the parts of the type - /// residing in the low word of the containing object. - /// - /// \param Hi - The classification for the parts of the type - /// residing in the higher words of the containing object. - /// - void postMerge(unsigned AggregateSize, Class &Lo, Class &Hi) const; - - /// classify - Determine the x86_64 register classes in which the - /// given type T should be passed. - /// - /// \param Lo - The classification for the parts of the type - /// residing in the low word of the containing object. - /// - /// \param Hi - The classification for the parts of the type - /// residing in the high word of the containing object. - /// - /// \param OffsetBase - The bit offset of this type in the - /// containing object. Some parameters are classified different - /// depending on whether they straddle an eightbyte boundary. - /// - /// \param isNamedArg - Whether the argument in question is a "named" - /// argument, as used in AMD64-ABI 3.5.7. - /// - /// \param IsRegCall - Whether the calling conversion is regcall. - /// - /// If a word is unused its result will be NoClass; if a type should - /// be passed in Memory then at least the classification of \arg Lo - /// will be Memory. - /// - /// The \arg Lo class will be NoClass iff the argument is ignored. - /// - /// If the \arg Lo class is ComplexX87, then the \arg Hi class will - /// also be ComplexX87. - void classify(QualType T, uint64_t OffsetBase, Class &Lo, Class &Hi, - bool isNamedArg, bool IsRegCall = false) const; - - llvm::Type *GetByteVectorType(QualType Ty) const; - llvm::Type *GetSSETypeAtOffset(llvm::Type *IRType, - unsigned IROffset, QualType SourceTy, - unsigned SourceOffset) const; - llvm::Type *GetINTEGERTypeAtOffset(llvm::Type *IRType, - unsigned IROffset, QualType SourceTy, - unsigned SourceOffset) const; - - /// getIndirectResult - Give a source type \arg Ty, return a suitable result - /// such that the argument will be returned in memory. - ABIArgInfo getIndirectReturnResult(QualType Ty) const; - - /// getIndirectResult - Give a source type \arg Ty, return a suitable result - /// such that the argument will be passed in memory. - /// - /// \param freeIntRegs - The number of free integer registers remaining - /// available. - ABIArgInfo getIndirectResult(QualType Ty, unsigned freeIntRegs) const; - - ABIArgInfo classifyReturnType(QualType RetTy) const; - - ABIArgInfo classifyArgumentType(QualType Ty, unsigned freeIntRegs, - unsigned &neededInt, unsigned &neededSSE, - bool isNamedArg, - bool IsRegCall = false) const; - - ABIArgInfo classifyRegCallStructType(QualType Ty, unsigned &NeededInt, - unsigned &NeededSSE, - unsigned &MaxVectorWidth) const; - - ABIArgInfo classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt, - unsigned &NeededSSE, - unsigned &MaxVectorWidth) const; - - bool IsIllegalVectorType(QualType Ty) const; - - /// The 0.98 ABI revision clarified a lot of ambiguities, - /// unfortunately in ways that were not always consistent with - /// certain previous compilers. In particular, platforms which - /// required strict binary compatibility with older versions of GCC - /// may need to exempt themselves. - bool honorsRevision0_98() const { - return !getTarget().getTriple().isOSDarwin(); - } - - /// GCC classifies <1 x long long> as SSE but some platform ABIs choose to - /// classify it as INTEGER (for compatibility with older clang compilers). - bool classifyIntegerMMXAsSSE() const { - // Clang <= 3.8 did not do this. - if (getContext().getLangOpts().getClangABICompat() <= - LangOptions::ClangABI::Ver3_8) - return false; - - const llvm::Triple &Triple = getTarget().getTriple(); - if (Triple.isOSDarwin() || Triple.isPS() || Triple.isOSFreeBSD()) - return false; - return true; - } - - // GCC classifies vectors of __int128 as memory. - bool passInt128VectorsInMem() const { - // Clang <= 9.0 did not do this. - if (getContext().getLangOpts().getClangABICompat() <= - LangOptions::ClangABI::Ver9) - return false; - - const llvm::Triple &T = getTarget().getTriple(); - return T.isOSLinux() || T.isOSNetBSD(); - } - - X86AVXABILevel AVXLevel; - // Some ABIs (e.g. X32 ABI and Native Client OS) use 32 bit pointers on - // 64-bit hardware. - bool Has64BitPointers; - -public: - X86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel) - : ABIInfo(CGT), AVXLevel(AVXLevel), - Has64BitPointers(CGT.getDataLayout().getPointerSize(0) == 8) {} - - bool isPassedUsingAVXType(QualType type) const { - unsigned neededInt, neededSSE; - // The freeIntRegs argument doesn't matter here. - ABIArgInfo info = classifyArgumentType(type, 0, neededInt, neededSSE, - /*isNamedArg*/true); - if (info.isDirect()) { - llvm::Type *ty = info.getCoerceToType(); - if (llvm::VectorType *vectorTy = dyn_cast_or_null(ty)) - return vectorTy->getPrimitiveSizeInBits().getFixedValue() > 128; - } - return false; - } - - void computeInfo(CGFunctionInfo &FI) const override; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - bool has64BitPointers() const { - return Has64BitPointers; - } -}; - -/// WinX86_64ABIInfo - The Windows X86_64 ABI information. -class WinX86_64ABIInfo : public ABIInfo { -public: - WinX86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel) - : ABIInfo(CGT), AVXLevel(AVXLevel), - IsMingw64(getTarget().getTriple().isWindowsGNUEnvironment()) {} - - void computeInfo(CGFunctionInfo &FI) const override; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - bool isHomogeneousAggregateBaseType(QualType Ty) const override { - // FIXME: Assumes vectorcall is in use. - return isX86VectorTypeForVectorCall(getContext(), Ty); - } - - bool isHomogeneousAggregateSmallEnough(const Type *Ty, - uint64_t NumMembers) const override { - // FIXME: Assumes vectorcall is in use. - return isX86VectorCallAggregateSmallEnough(NumMembers); - } - -private: - ABIArgInfo classify(QualType Ty, unsigned &FreeSSERegs, bool IsReturnType, - bool IsVectorCall, bool IsRegCall) const; - ABIArgInfo reclassifyHvaArgForVectorCall(QualType Ty, unsigned &FreeSSERegs, - const ABIArgInfo ¤t) const; - - X86AVXABILevel AVXLevel; - - bool IsMingw64; -}; - -class X86_64TargetCodeGenInfo : public TargetCodeGenInfo { -public: - X86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel) - : TargetCodeGenInfo(std::make_unique(CGT, AVXLevel)) { - SwiftInfo = - std::make_unique(CGT, /*SwiftErrorInRegister=*/true); - } - - /// Disable tail call on x86-64. The epilogue code before the tail jump blocks - /// autoreleaseRV/retainRV and autoreleaseRV/unsafeClaimRV optimizations. - bool markARCOptimizedReturnCallsAsNoTail() const override { return true; } - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { - return 7; - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8); - - // 0-15 are the 16 integer registers. - // 16 is %rip. - AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16); - return false; - } - - llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF, - StringRef Constraint, - llvm::Type* Ty) const override { - return X86AdjustInlineAsmType(CGF, Constraint, Ty); - } - - bool isNoProtoCallVariadic(const CallArgList &args, - const FunctionNoProtoType *fnType) const override { - // The default CC on x86-64 sets %al to the number of SSA - // registers used, and GCC sets this when calling an unprototyped - // function, so we override the default behavior. However, don't do - // that when AVX types are involved: the ABI explicitly states it is - // undefined, and it doesn't work in practice because of how the ABI - // defines varargs anyway. - if (fnType->getCallConv() == CC_C) { - bool HasAVXType = false; - for (CallArgList::const_iterator - it = args.begin(), ie = args.end(); it != ie; ++it) { - if (getABIInfo().isPassedUsingAVXType(it->Ty)) { - HasAVXType = true; - break; - } - } - - if (!HasAVXType) - return true; - } - - return TargetCodeGenInfo::isNoProtoCallVariadic(args, fnType); - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - if (GV->isDeclaration()) - return; - if (const FunctionDecl *FD = dyn_cast_or_null(D)) { - if (FD->hasAttr()) { - llvm::Function *Fn = cast(GV); - Fn->addFnAttr("stackrealign"); - } - - addX86InterruptAttrs(FD, GV, CGM); - } - } - - void checkFunctionCallABI(CodeGenModule &CGM, SourceLocation CallLoc, - const FunctionDecl *Caller, - const FunctionDecl *Callee, - const CallArgList &Args) const override; -}; -} // namespace - -static void initFeatureMaps(const ASTContext &Ctx, - llvm::StringMap &CallerMap, - const FunctionDecl *Caller, - llvm::StringMap &CalleeMap, - const FunctionDecl *Callee) { - if (CalleeMap.empty() && CallerMap.empty()) { - // The caller is potentially nullptr in the case where the call isn't in a - // function. In this case, the getFunctionFeatureMap ensures we just get - // the TU level setting (since it cannot be modified by 'target'.. - Ctx.getFunctionFeatureMap(CallerMap, Caller); - Ctx.getFunctionFeatureMap(CalleeMap, Callee); - } -} - -static bool checkAVXParamFeature(DiagnosticsEngine &Diag, - SourceLocation CallLoc, - const llvm::StringMap &CallerMap, - const llvm::StringMap &CalleeMap, - QualType Ty, StringRef Feature, - bool IsArgument) { - bool CallerHasFeat = CallerMap.lookup(Feature); - bool CalleeHasFeat = CalleeMap.lookup(Feature); - if (!CallerHasFeat && !CalleeHasFeat) - return Diag.Report(CallLoc, diag::warn_avx_calling_convention) - << IsArgument << Ty << Feature; - - // Mixing calling conventions here is very clearly an error. - if (!CallerHasFeat || !CalleeHasFeat) - return Diag.Report(CallLoc, diag::err_avx_calling_convention) - << IsArgument << Ty << Feature; - - // Else, both caller and callee have the required feature, so there is no need - // to diagnose. - return false; -} - -static bool checkAVXParam(DiagnosticsEngine &Diag, ASTContext &Ctx, - SourceLocation CallLoc, - const llvm::StringMap &CallerMap, - const llvm::StringMap &CalleeMap, QualType Ty, - bool IsArgument) { - uint64_t Size = Ctx.getTypeSize(Ty); - if (Size > 256) - return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty, - "avx512f", IsArgument); - - if (Size > 128) - return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty, "avx", - IsArgument); - - return false; -} - -void X86_64TargetCodeGenInfo::checkFunctionCallABI( - CodeGenModule &CGM, SourceLocation CallLoc, const FunctionDecl *Caller, - const FunctionDecl *Callee, const CallArgList &Args) const { - llvm::StringMap CallerMap; - llvm::StringMap CalleeMap; - unsigned ArgIndex = 0; - - // We need to loop through the actual call arguments rather than the - // function's parameters, in case this variadic. - for (const CallArg &Arg : Args) { - // The "avx" feature changes how vectors >128 in size are passed. "avx512f" - // additionally changes how vectors >256 in size are passed. Like GCC, we - // warn when a function is called with an argument where this will change. - // Unlike GCC, we also error when it is an obvious ABI mismatch, that is, - // the caller and callee features are mismatched. - // Unfortunately, we cannot do this diagnostic in SEMA, since the callee can - // change its ABI with attribute-target after this call. - if (Arg.getType()->isVectorType() && - CGM.getContext().getTypeSize(Arg.getType()) > 128) { - initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee); - QualType Ty = Arg.getType(); - // The CallArg seems to have desugared the type already, so for clearer - // diagnostics, replace it with the type in the FunctionDecl if possible. - if (ArgIndex < Callee->getNumParams()) - Ty = Callee->getParamDecl(ArgIndex)->getType(); - - if (checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap, - CalleeMap, Ty, /*IsArgument*/ true)) - return; - } - ++ArgIndex; - } - - // Check return always, as we don't have a good way of knowing in codegen - // whether this value is used, tail-called, etc. - if (Callee->getReturnType()->isVectorType() && - CGM.getContext().getTypeSize(Callee->getReturnType()) > 128) { - initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee); - checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap, - CalleeMap, Callee->getReturnType(), - /*IsArgument*/ false); - } -} - -std::string TargetCodeGenInfo::qualifyWindowsLibrary(StringRef Lib) { - // If the argument does not end in .lib, automatically add the suffix. - // If the argument contains a space, enclose it in quotes. - // This matches the behavior of MSVC. - bool Quote = Lib.contains(' '); - std::string ArgStr = Quote ? "\"" : ""; - ArgStr += Lib; - if (!Lib.ends_with_insensitive(".lib") && !Lib.ends_with_insensitive(".a")) - ArgStr += ".lib"; - ArgStr += Quote ? "\"" : ""; - return ArgStr; -} - -namespace { -class WinX86_32TargetCodeGenInfo : public X86_32TargetCodeGenInfo { -public: - WinX86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, - bool DarwinVectorABI, bool RetSmallStructInRegABI, bool Win32StructABI, - unsigned NumRegisterParameters) - : X86_32TargetCodeGenInfo(CGT, DarwinVectorABI, RetSmallStructInRegABI, - Win32StructABI, NumRegisterParameters, false) {} - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override; - - void getDependentLibraryOption(llvm::StringRef Lib, - llvm::SmallString<24> &Opt) const override { - Opt = "/DEFAULTLIB:"; - Opt += qualifyWindowsLibrary(Lib); - } - - void getDetectMismatchOption(llvm::StringRef Name, - llvm::StringRef Value, - llvm::SmallString<32> &Opt) const override { - Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; - } -}; -} // namespace - -void TargetCodeGenInfo::addStackProbeTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { - if (llvm::Function *Fn = dyn_cast_or_null(GV)) { - if (CGM.getCodeGenOpts().StackProbeSize != 4096) - Fn->addFnAttr("stack-probe-size", - llvm::utostr(CGM.getCodeGenOpts().StackProbeSize)); - if (CGM.getCodeGenOpts().NoStackArgProbe) - Fn->addFnAttr("no-stack-arg-probe"); - } -} - -void WinX86_32TargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { - X86_32TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); - if (GV->isDeclaration()) - return; - addStackProbeTargetAttributes(D, GV, CGM); -} - -namespace { -class WinX86_64TargetCodeGenInfo : public TargetCodeGenInfo { -public: - WinX86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, - X86AVXABILevel AVXLevel) - : TargetCodeGenInfo(std::make_unique(CGT, AVXLevel)) { - SwiftInfo = - std::make_unique(CGT, /*SwiftErrorInRegister=*/true); - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override; - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { - return 7; - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8); - - // 0-15 are the 16 integer registers. - // 16 is %rip. - AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16); - return false; - } - - void getDependentLibraryOption(llvm::StringRef Lib, - llvm::SmallString<24> &Opt) const override { - Opt = "/DEFAULTLIB:"; - Opt += qualifyWindowsLibrary(Lib); - } - - void getDetectMismatchOption(llvm::StringRef Name, - llvm::StringRef Value, - llvm::SmallString<32> &Opt) const override { - Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; - } -}; -} // namespace - -void WinX86_64TargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { - TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); - if (GV->isDeclaration()) - return; - if (const FunctionDecl *FD = dyn_cast_or_null(D)) { - if (FD->hasAttr()) { - llvm::Function *Fn = cast(GV); - Fn->addFnAttr("stackrealign"); - } - - addX86InterruptAttrs(FD, GV, CGM); - } - - addStackProbeTargetAttributes(D, GV, CGM); -} - -void X86_64ABIInfo::postMerge(unsigned AggregateSize, Class &Lo, - Class &Hi) const { - // AMD64-ABI 3.2.3p2: Rule 5. Then a post merger cleanup is done: - // - // (a) If one of the classes is Memory, the whole argument is passed in - // memory. - // - // (b) If X87UP is not preceded by X87, the whole argument is passed in - // memory. - // - // (c) If the size of the aggregate exceeds two eightbytes and the first - // eightbyte isn't SSE or any other eightbyte isn't SSEUP, the whole - // argument is passed in memory. NOTE: This is necessary to keep the - // ABI working for processors that don't support the __m256 type. - // - // (d) If SSEUP is not preceded by SSE or SSEUP, it is converted to SSE. - // - // Some of these are enforced by the merging logic. Others can arise - // only with unions; for example: - // union { _Complex double; unsigned; } - // - // Note that clauses (b) and (c) were added in 0.98. - // - if (Hi == Memory) - Lo = Memory; - if (Hi == X87Up && Lo != X87 && honorsRevision0_98()) - Lo = Memory; - if (AggregateSize > 128 && (Lo != SSE || Hi != SSEUp)) - Lo = Memory; - if (Hi == SSEUp && Lo != SSE) - Hi = SSE; -} - -X86_64ABIInfo::Class X86_64ABIInfo::merge(Class Accum, Class Field) { - // AMD64-ABI 3.2.3p2: Rule 4. Each field of an object is - // classified recursively so that always two fields are - // considered. The resulting class is calculated according to - // the classes of the fields in the eightbyte: - // - // (a) If both classes are equal, this is the resulting class. - // - // (b) If one of the classes is NO_CLASS, the resulting class is - // the other class. - // - // (c) If one of the classes is MEMORY, the result is the MEMORY - // class. - // - // (d) If one of the classes is INTEGER, the result is the - // INTEGER. - // - // (e) If one of the classes is X87, X87UP, COMPLEX_X87 class, - // MEMORY is used as class. - // - // (f) Otherwise class SSE is used. - - // Accum should never be memory (we should have returned) or - // ComplexX87 (because this cannot be passed in a structure). - assert((Accum != Memory && Accum != ComplexX87) && - "Invalid accumulated classification during merge."); - if (Accum == Field || Field == NoClass) - return Accum; - if (Field == Memory) - return Memory; - if (Accum == NoClass) - return Field; - if (Accum == Integer || Field == Integer) - return Integer; - if (Field == X87 || Field == X87Up || Field == ComplexX87 || - Accum == X87 || Accum == X87Up) - return Memory; - return SSE; -} - -void X86_64ABIInfo::classify(QualType Ty, uint64_t OffsetBase, Class &Lo, - Class &Hi, bool isNamedArg, bool IsRegCall) const { - // FIXME: This code can be simplified by introducing a simple value class for - // Class pairs with appropriate constructor methods for the various - // situations. - - // FIXME: Some of the split computations are wrong; unaligned vectors - // shouldn't be passed in registers for example, so there is no chance they - // can straddle an eightbyte. Verify & simplify. - - Lo = Hi = NoClass; - - Class &Current = OffsetBase < 64 ? Lo : Hi; - Current = Memory; - - if (const BuiltinType *BT = Ty->getAs()) { - BuiltinType::Kind k = BT->getKind(); - - if (k == BuiltinType::Void) { - Current = NoClass; - } else if (k == BuiltinType::Int128 || k == BuiltinType::UInt128) { - Lo = Integer; - Hi = Integer; - } else if (k >= BuiltinType::Bool && k <= BuiltinType::LongLong) { - Current = Integer; - } else if (k == BuiltinType::Float || k == BuiltinType::Double || - k == BuiltinType::Float16 || k == BuiltinType::BFloat16) { - Current = SSE; - } else if (k == BuiltinType::LongDouble) { - const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat(); - if (LDF == &llvm::APFloat::IEEEquad()) { - Lo = SSE; - Hi = SSEUp; - } else if (LDF == &llvm::APFloat::x87DoubleExtended()) { - Lo = X87; - Hi = X87Up; - } else if (LDF == &llvm::APFloat::IEEEdouble()) { - Current = SSE; - } else - llvm_unreachable("unexpected long double representation!"); - } - // FIXME: _Decimal32 and _Decimal64 are SSE. - // FIXME: _float128 and _Decimal128 are (SSE, SSEUp). - return; - } - - if (const EnumType *ET = Ty->getAs()) { - // Classify the underlying integer type. - classify(ET->getDecl()->getIntegerType(), OffsetBase, Lo, Hi, isNamedArg); - return; - } - - if (Ty->hasPointerRepresentation()) { - Current = Integer; - return; - } - - if (Ty->isMemberPointerType()) { - if (Ty->isMemberFunctionPointerType()) { - if (Has64BitPointers) { - // If Has64BitPointers, this is an {i64, i64}, so classify both - // Lo and Hi now. - Lo = Hi = Integer; - } else { - // Otherwise, with 32-bit pointers, this is an {i32, i32}. If that - // straddles an eightbyte boundary, Hi should be classified as well. - uint64_t EB_FuncPtr = (OffsetBase) / 64; - uint64_t EB_ThisAdj = (OffsetBase + 64 - 1) / 64; - if (EB_FuncPtr != EB_ThisAdj) { - Lo = Hi = Integer; - } else { - Current = Integer; - } - } - } else { - Current = Integer; - } - return; - } - - if (const VectorType *VT = Ty->getAs()) { - uint64_t Size = getContext().getTypeSize(VT); - if (Size == 1 || Size == 8 || Size == 16 || Size == 32) { - // gcc passes the following as integer: - // 4 bytes - <4 x char>, <2 x short>, <1 x int>, <1 x float> - // 2 bytes - <2 x char>, <1 x short> - // 1 byte - <1 x char> - Current = Integer; - - // If this type crosses an eightbyte boundary, it should be - // split. - uint64_t EB_Lo = (OffsetBase) / 64; - uint64_t EB_Hi = (OffsetBase + Size - 1) / 64; - if (EB_Lo != EB_Hi) - Hi = Lo; - } else if (Size == 64) { - QualType ElementType = VT->getElementType(); - - // gcc passes <1 x double> in memory. :( - if (ElementType->isSpecificBuiltinType(BuiltinType::Double)) - return; - - // gcc passes <1 x long long> as SSE but clang used to unconditionally - // pass them as integer. For platforms where clang is the de facto - // platform compiler, we must continue to use integer. - if (!classifyIntegerMMXAsSSE() && - (ElementType->isSpecificBuiltinType(BuiltinType::LongLong) || - ElementType->isSpecificBuiltinType(BuiltinType::ULongLong) || - ElementType->isSpecificBuiltinType(BuiltinType::Long) || - ElementType->isSpecificBuiltinType(BuiltinType::ULong))) - Current = Integer; - else - Current = SSE; - - // If this type crosses an eightbyte boundary, it should be - // split. - if (OffsetBase && OffsetBase != 64) - Hi = Lo; - } else if (Size == 128 || - (isNamedArg && Size <= getNativeVectorSizeForAVXABI(AVXLevel))) { - QualType ElementType = VT->getElementType(); - - // gcc passes 256 and 512 bit vectors in memory. :( - if (passInt128VectorsInMem() && Size != 128 && - (ElementType->isSpecificBuiltinType(BuiltinType::Int128) || - ElementType->isSpecificBuiltinType(BuiltinType::UInt128))) - return; - - // Arguments of 256-bits are split into four eightbyte chunks. The - // least significant one belongs to class SSE and all the others to class - // SSEUP. The original Lo and Hi design considers that types can't be - // greater than 128-bits, so a 64-bit split in Hi and Lo makes sense. - // This design isn't correct for 256-bits, but since there're no cases - // where the upper parts would need to be inspected, avoid adding - // complexity and just consider Hi to match the 64-256 part. - // - // Note that per 3.5.7 of AMD64-ABI, 256-bit args are only passed in - // registers if they are "named", i.e. not part of the "..." of a - // variadic function. - // - // Similarly, per 3.2.3. of the AVX512 draft, 512-bits ("named") args are - // split into eight eightbyte chunks, one SSE and seven SSEUP. - Lo = SSE; - Hi = SSEUp; - } - return; - } - - if (const ComplexType *CT = Ty->getAs()) { - QualType ET = getContext().getCanonicalType(CT->getElementType()); - - uint64_t Size = getContext().getTypeSize(Ty); - if (ET->isIntegralOrEnumerationType()) { - if (Size <= 64) - Current = Integer; - else if (Size <= 128) - Lo = Hi = Integer; - } else if (ET->isFloat16Type() || ET == getContext().FloatTy || - ET->isBFloat16Type()) { - Current = SSE; - } else if (ET == getContext().DoubleTy) { - Lo = Hi = SSE; - } else if (ET == getContext().LongDoubleTy) { - const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat(); - if (LDF == &llvm::APFloat::IEEEquad()) - Current = Memory; - else if (LDF == &llvm::APFloat::x87DoubleExtended()) - Current = ComplexX87; - else if (LDF == &llvm::APFloat::IEEEdouble()) - Lo = Hi = SSE; - else - llvm_unreachable("unexpected long double representation!"); - } - - // If this complex type crosses an eightbyte boundary then it - // should be split. - uint64_t EB_Real = (OffsetBase) / 64; - uint64_t EB_Imag = (OffsetBase + getContext().getTypeSize(ET)) / 64; - if (Hi == NoClass && EB_Real != EB_Imag) - Hi = Lo; - - return; - } - - if (const auto *EITy = Ty->getAs()) { - if (EITy->getNumBits() <= 64) - Current = Integer; - else if (EITy->getNumBits() <= 128) - Lo = Hi = Integer; - // Larger values need to get passed in memory. - return; - } - - if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) { - // Arrays are treated like structures. - - uint64_t Size = getContext().getTypeSize(Ty); - - // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger - // than eight eightbytes, ..., it has class MEMORY. - // regcall ABI doesn't have limitation to an object. The only limitation - // is the free registers, which will be checked in computeInfo. - if (!IsRegCall && Size > 512) - return; - - // AMD64-ABI 3.2.3p2: Rule 1. If ..., or it contains unaligned - // fields, it has class MEMORY. - // - // Only need to check alignment of array base. - if (OffsetBase % getContext().getTypeAlign(AT->getElementType())) - return; - - // Otherwise implement simplified merge. We could be smarter about - // this, but it isn't worth it and would be harder to verify. - Current = NoClass; - uint64_t EltSize = getContext().getTypeSize(AT->getElementType()); - uint64_t ArraySize = AT->getSize().getZExtValue(); - - // The only case a 256-bit wide vector could be used is when the array - // contains a single 256-bit element. Since Lo and Hi logic isn't extended - // to work for sizes wider than 128, early check and fallback to memory. - // - if (Size > 128 && - (Size != EltSize || Size > getNativeVectorSizeForAVXABI(AVXLevel))) - return; - - for (uint64_t i=0, Offset=OffsetBase; igetElementType(), Offset, FieldLo, FieldHi, isNamedArg); - Lo = merge(Lo, FieldLo); - Hi = merge(Hi, FieldHi); - if (Lo == Memory || Hi == Memory) - break; - } - - postMerge(Size, Lo, Hi); - assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp array classification."); - return; - } - - if (const RecordType *RT = Ty->getAs()) { - uint64_t Size = getContext().getTypeSize(Ty); - - // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger - // than eight eightbytes, ..., it has class MEMORY. - if (Size > 512) - return; - - // AMD64-ABI 3.2.3p2: Rule 2. If a C++ object has either a non-trivial - // copy constructor or a non-trivial destructor, it is passed by invisible - // reference. - if (getRecordArgABI(RT, getCXXABI())) - return; - - const RecordDecl *RD = RT->getDecl(); - - // Assume variable sized types are passed in memory. - if (RD->hasFlexibleArrayMember()) - return; - - const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); - - // Reset Lo class, this will be recomputed. - Current = NoClass; - - // If this is a C++ record, classify the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - for (const auto &I : CXXRD->bases()) { - assert(!I.isVirtual() && !I.getType()->isDependentType() && - "Unexpected base class!"); - const auto *Base = - cast(I.getType()->castAs()->getDecl()); - - // Classify this field. - // - // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate exceeds a - // single eightbyte, each is classified separately. Each eightbyte gets - // initialized to class NO_CLASS. - Class FieldLo, FieldHi; - uint64_t Offset = - OffsetBase + getContext().toBits(Layout.getBaseClassOffset(Base)); - classify(I.getType(), Offset, FieldLo, FieldHi, isNamedArg); - Lo = merge(Lo, FieldLo); - Hi = merge(Hi, FieldHi); - if (Lo == Memory || Hi == Memory) { - postMerge(Size, Lo, Hi); - return; - } - } - } - - // Classify the fields one at a time, merging the results. - unsigned idx = 0; - bool UseClang11Compat = getContext().getLangOpts().getClangABICompat() <= - LangOptions::ClangABI::Ver11 || - getContext().getTargetInfo().getTriple().isPS(); - bool IsUnion = RT->isUnionType() && !UseClang11Compat; - - for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); - i != e; ++i, ++idx) { - uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx); - bool BitField = i->isBitField(); - - // Ignore padding bit-fields. - if (BitField && i->isUnnamedBitfield()) - continue; - - // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger than - // eight eightbytes, or it contains unaligned fields, it has class MEMORY. - // - // The only case a 256-bit or a 512-bit wide vector could be used is when - // the struct contains a single 256-bit or 512-bit element. Early check - // and fallback to memory. - // - // FIXME: Extended the Lo and Hi logic properly to work for size wider - // than 128. - if (Size > 128 && - ((!IsUnion && Size != getContext().getTypeSize(i->getType())) || - Size > getNativeVectorSizeForAVXABI(AVXLevel))) { - Lo = Memory; - postMerge(Size, Lo, Hi); - return; - } - // Note, skip this test for bit-fields, see below. - if (!BitField && Offset % getContext().getTypeAlign(i->getType())) { - Lo = Memory; - postMerge(Size, Lo, Hi); - return; - } - - // Classify this field. - // - // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate - // exceeds a single eightbyte, each is classified - // separately. Each eightbyte gets initialized to class - // NO_CLASS. - Class FieldLo, FieldHi; - - // Bit-fields require special handling, they do not force the - // structure to be passed in memory even if unaligned, and - // therefore they can straddle an eightbyte. - if (BitField) { - assert(!i->isUnnamedBitfield()); - uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx); - uint64_t Size = i->getBitWidthValue(getContext()); - - uint64_t EB_Lo = Offset / 64; - uint64_t EB_Hi = (Offset + Size - 1) / 64; - - if (EB_Lo) { - assert(EB_Hi == EB_Lo && "Invalid classification, type > 16 bytes."); - FieldLo = NoClass; - FieldHi = Integer; - } else { - FieldLo = Integer; - FieldHi = EB_Hi ? Integer : NoClass; - } - } else - classify(i->getType(), Offset, FieldLo, FieldHi, isNamedArg); - Lo = merge(Lo, FieldLo); - Hi = merge(Hi, FieldHi); - if (Lo == Memory || Hi == Memory) - break; - } - - postMerge(Size, Lo, Hi); - } -} - -ABIArgInfo X86_64ABIInfo::getIndirectReturnResult(QualType Ty) const { - // If this is a scalar LLVM value then assume LLVM will pass it in the right - // place naturally. - if (!isAggregateTypeForABI(Ty)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - if (Ty->isBitIntType()) - return getNaturalAlignIndirect(Ty); - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); - } - - return getNaturalAlignIndirect(Ty); -} - -bool X86_64ABIInfo::IsIllegalVectorType(QualType Ty) const { - if (const VectorType *VecTy = Ty->getAs()) { - uint64_t Size = getContext().getTypeSize(VecTy); - unsigned LargestVector = getNativeVectorSizeForAVXABI(AVXLevel); - if (Size <= 64 || Size > LargestVector) - return true; - QualType EltTy = VecTy->getElementType(); - if (passInt128VectorsInMem() && - (EltTy->isSpecificBuiltinType(BuiltinType::Int128) || - EltTy->isSpecificBuiltinType(BuiltinType::UInt128))) - return true; - } - - return false; -} - -ABIArgInfo X86_64ABIInfo::getIndirectResult(QualType Ty, - unsigned freeIntRegs) const { - // If this is a scalar LLVM value then assume LLVM will pass it in the right - // place naturally. - // - // This assumption is optimistic, as there could be free registers available - // when we need to pass this argument in memory, and LLVM could try to pass - // the argument in the free register. This does not seem to happen currently, - // but this code would be much safer if we could mark the argument with - // 'onstack'. See PR12193. - if (!isAggregateTypeForABI(Ty) && !IsIllegalVectorType(Ty) && - !Ty->isBitIntType()) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); - } - - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - // Compute the byval alignment. We specify the alignment of the byval in all - // cases so that the mid-level optimizer knows the alignment of the byval. - unsigned Align = std::max(getContext().getTypeAlign(Ty) / 8, 8U); - - // Attempt to avoid passing indirect results using byval when possible. This - // is important for good codegen. - // - // We do this by coercing the value into a scalar type which the backend can - // handle naturally (i.e., without using byval). - // - // For simplicity, we currently only do this when we have exhausted all of the - // free integer registers. Doing this when there are free integer registers - // would require more care, as we would have to ensure that the coerced value - // did not claim the unused register. That would require either reording the - // arguments to the function (so that any subsequent inreg values came first), - // or only doing this optimization when there were no following arguments that - // might be inreg. - // - // We currently expect it to be rare (particularly in well written code) for - // arguments to be passed on the stack when there are still free integer - // registers available (this would typically imply large structs being passed - // by value), so this seems like a fair tradeoff for now. - // - // We can revisit this if the backend grows support for 'onstack' parameter - // attributes. See PR12193. - if (freeIntRegs == 0) { - uint64_t Size = getContext().getTypeSize(Ty); - - // If this type fits in an eightbyte, coerce it into the matching integral - // type, which will end up on the stack (with alignment 8). - if (Align == 8 && Size <= 64) - return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), - Size)); - } - - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(Align)); -} - -/// The ABI specifies that a value should be passed in a full vector XMM/YMM -/// register. Pick an LLVM IR type that will be passed as a vector register. -llvm::Type *X86_64ABIInfo::GetByteVectorType(QualType Ty) const { - // Wrapper structs/arrays that only contain vectors are passed just like - // vectors; strip them off if present. - if (const Type *InnerTy = isSingleElementStruct(Ty, getContext())) - Ty = QualType(InnerTy, 0); - - llvm::Type *IRType = CGT.ConvertType(Ty); - if (isa(IRType)) { - // Don't pass vXi128 vectors in their native type, the backend can't - // legalize them. - if (passInt128VectorsInMem() && - cast(IRType)->getElementType()->isIntegerTy(128)) { - // Use a vXi64 vector. - uint64_t Size = getContext().getTypeSize(Ty); - return llvm::FixedVectorType::get(llvm::Type::getInt64Ty(getVMContext()), - Size / 64); - } - - return IRType; - } - - if (IRType->getTypeID() == llvm::Type::FP128TyID) - return IRType; - - // We couldn't find the preferred IR vector type for 'Ty'. - uint64_t Size = getContext().getTypeSize(Ty); - assert((Size == 128 || Size == 256 || Size == 512) && "Invalid type found!"); - - - // Return a LLVM IR vector type based on the size of 'Ty'. - return llvm::FixedVectorType::get(llvm::Type::getDoubleTy(getVMContext()), - Size / 64); -} - -/// BitsContainNoUserData - Return true if the specified [start,end) bit range -/// is known to either be off the end of the specified type or being in -/// alignment padding. The user type specified is known to be at most 128 bits -/// in size, and have passed through X86_64ABIInfo::classify with a successful -/// classification that put one of the two halves in the INTEGER class. -/// -/// It is conservatively correct to return false. -static bool BitsContainNoUserData(QualType Ty, unsigned StartBit, - unsigned EndBit, ASTContext &Context) { - // If the bytes being queried are off the end of the type, there is no user - // data hiding here. This handles analysis of builtins, vectors and other - // types that don't contain interesting padding. - unsigned TySize = (unsigned)Context.getTypeSize(Ty); - if (TySize <= StartBit) - return true; - - if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) { - unsigned EltSize = (unsigned)Context.getTypeSize(AT->getElementType()); - unsigned NumElts = (unsigned)AT->getSize().getZExtValue(); - - // Check each element to see if the element overlaps with the queried range. - for (unsigned i = 0; i != NumElts; ++i) { - // If the element is after the span we care about, then we're done.. - unsigned EltOffset = i*EltSize; - if (EltOffset >= EndBit) break; - - unsigned EltStart = EltOffset < StartBit ? StartBit-EltOffset :0; - if (!BitsContainNoUserData(AT->getElementType(), EltStart, - EndBit-EltOffset, Context)) - return false; - } - // If it overlaps no elements, then it is safe to process as padding. - return true; - } - - if (const RecordType *RT = Ty->getAs()) { - const RecordDecl *RD = RT->getDecl(); - const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - for (const auto &I : CXXRD->bases()) { - assert(!I.isVirtual() && !I.getType()->isDependentType() && - "Unexpected base class!"); - const auto *Base = - cast(I.getType()->castAs()->getDecl()); - - // If the base is after the span we care about, ignore it. - unsigned BaseOffset = Context.toBits(Layout.getBaseClassOffset(Base)); - if (BaseOffset >= EndBit) continue; - - unsigned BaseStart = BaseOffset < StartBit ? StartBit-BaseOffset :0; - if (!BitsContainNoUserData(I.getType(), BaseStart, - EndBit-BaseOffset, Context)) - return false; - } - } - - // Verify that no field has data that overlaps the region of interest. Yes - // this could be sped up a lot by being smarter about queried fields, - // however we're only looking at structs up to 16 bytes, so we don't care - // much. - unsigned idx = 0; - for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); - i != e; ++i, ++idx) { - unsigned FieldOffset = (unsigned)Layout.getFieldOffset(idx); - - // If we found a field after the region we care about, then we're done. - if (FieldOffset >= EndBit) break; - - unsigned FieldStart = FieldOffset < StartBit ? StartBit-FieldOffset :0; - if (!BitsContainNoUserData(i->getType(), FieldStart, EndBit-FieldOffset, - Context)) - return false; - } - - // If nothing in this record overlapped the area of interest, then we're - // clean. - return true; - } - - return false; -} - -/// getFPTypeAtOffset - Return a floating point type at the specified offset. -static llvm::Type *getFPTypeAtOffset(llvm::Type *IRType, unsigned IROffset, - const llvm::DataLayout &TD) { - if (IROffset == 0 && IRType->isFloatingPointTy()) - return IRType; - - // If this is a struct, recurse into the field at the specified offset. - if (llvm::StructType *STy = dyn_cast(IRType)) { - if (!STy->getNumContainedTypes()) - return nullptr; - - const llvm::StructLayout *SL = TD.getStructLayout(STy); - unsigned Elt = SL->getElementContainingOffset(IROffset); - IROffset -= SL->getElementOffset(Elt); - return getFPTypeAtOffset(STy->getElementType(Elt), IROffset, TD); - } - - // If this is an array, recurse into the field at the specified offset. - if (llvm::ArrayType *ATy = dyn_cast(IRType)) { - llvm::Type *EltTy = ATy->getElementType(); - unsigned EltSize = TD.getTypeAllocSize(EltTy); - IROffset -= IROffset / EltSize * EltSize; - return getFPTypeAtOffset(EltTy, IROffset, TD); - } - - return nullptr; -} - -/// GetSSETypeAtOffset - Return a type that will be passed by the backend in the -/// low 8 bytes of an XMM register, corresponding to the SSE class. -llvm::Type *X86_64ABIInfo:: -GetSSETypeAtOffset(llvm::Type *IRType, unsigned IROffset, - QualType SourceTy, unsigned SourceOffset) const { - const llvm::DataLayout &TD = getDataLayout(); - unsigned SourceSize = - (unsigned)getContext().getTypeSize(SourceTy) / 8 - SourceOffset; - llvm::Type *T0 = getFPTypeAtOffset(IRType, IROffset, TD); - if (!T0 || T0->isDoubleTy()) - return llvm::Type::getDoubleTy(getVMContext()); - - // Get the adjacent FP type. - llvm::Type *T1 = nullptr; - unsigned T0Size = TD.getTypeAllocSize(T0); - if (SourceSize > T0Size) - T1 = getFPTypeAtOffset(IRType, IROffset + T0Size, TD); - if (T1 == nullptr) { - // Check if IRType is a half/bfloat + float. float type will be in IROffset+4 due - // to its alignment. - if (T0->is16bitFPTy() && SourceSize > 4) - T1 = getFPTypeAtOffset(IRType, IROffset + 4, TD); - // If we can't get a second FP type, return a simple half or float. - // avx512fp16-abi.c:pr51813_2 shows it works to return float for - // {float, i8} too. - if (T1 == nullptr) - return T0; - } - - if (T0->isFloatTy() && T1->isFloatTy()) - return llvm::FixedVectorType::get(T0, 2); - - if (T0->is16bitFPTy() && T1->is16bitFPTy()) { - llvm::Type *T2 = nullptr; - if (SourceSize > 4) - T2 = getFPTypeAtOffset(IRType, IROffset + 4, TD); - if (T2 == nullptr) - return llvm::FixedVectorType::get(T0, 2); - return llvm::FixedVectorType::get(T0, 4); - } - - if (T0->is16bitFPTy() || T1->is16bitFPTy()) - return llvm::FixedVectorType::get(llvm::Type::getHalfTy(getVMContext()), 4); - - return llvm::Type::getDoubleTy(getVMContext()); -} - - -/// GetINTEGERTypeAtOffset - The ABI specifies that a value should be passed in -/// an 8-byte GPR. This means that we either have a scalar or we are talking -/// about the high or low part of an up-to-16-byte struct. This routine picks -/// the best LLVM IR type to represent this, which may be i64 or may be anything -/// else that the backend will pass in a GPR that works better (e.g. i8, %foo*, -/// etc). -/// -/// PrefType is an LLVM IR type that corresponds to (part of) the IR type for -/// the source type. IROffset is an offset in bytes into the LLVM IR type that -/// the 8-byte value references. PrefType may be null. -/// -/// SourceTy is the source-level type for the entire argument. SourceOffset is -/// an offset into this that we're processing (which is always either 0 or 8). -/// -llvm::Type *X86_64ABIInfo:: -GetINTEGERTypeAtOffset(llvm::Type *IRType, unsigned IROffset, - QualType SourceTy, unsigned SourceOffset) const { - // If we're dealing with an un-offset LLVM IR type, then it means that we're - // returning an 8-byte unit starting with it. See if we can safely use it. - if (IROffset == 0) { - // Pointers and int64's always fill the 8-byte unit. - if ((isa(IRType) && Has64BitPointers) || - IRType->isIntegerTy(64)) - return IRType; - - // If we have a 1/2/4-byte integer, we can use it only if the rest of the - // goodness in the source type is just tail padding. This is allowed to - // kick in for struct {double,int} on the int, but not on - // struct{double,int,int} because we wouldn't return the second int. We - // have to do this analysis on the source type because we can't depend on - // unions being lowered a specific way etc. - if (IRType->isIntegerTy(8) || IRType->isIntegerTy(16) || - IRType->isIntegerTy(32) || - (isa(IRType) && !Has64BitPointers)) { - unsigned BitWidth = isa(IRType) ? 32 : - cast(IRType)->getBitWidth(); - - if (BitsContainNoUserData(SourceTy, SourceOffset*8+BitWidth, - SourceOffset*8+64, getContext())) - return IRType; - } - } - - if (llvm::StructType *STy = dyn_cast(IRType)) { - // If this is a struct, recurse into the field at the specified offset. - const llvm::StructLayout *SL = getDataLayout().getStructLayout(STy); - if (IROffset < SL->getSizeInBytes()) { - unsigned FieldIdx = SL->getElementContainingOffset(IROffset); - IROffset -= SL->getElementOffset(FieldIdx); - - return GetINTEGERTypeAtOffset(STy->getElementType(FieldIdx), IROffset, - SourceTy, SourceOffset); - } - } - - if (llvm::ArrayType *ATy = dyn_cast(IRType)) { - llvm::Type *EltTy = ATy->getElementType(); - unsigned EltSize = getDataLayout().getTypeAllocSize(EltTy); - unsigned EltOffset = IROffset/EltSize*EltSize; - return GetINTEGERTypeAtOffset(EltTy, IROffset-EltOffset, SourceTy, - SourceOffset); - } - - // Okay, we don't have any better idea of what to pass, so we pass this in an - // integer register that isn't too big to fit the rest of the struct. - unsigned TySizeInBytes = - (unsigned)getContext().getTypeSizeInChars(SourceTy).getQuantity(); - - assert(TySizeInBytes != SourceOffset && "Empty field?"); - - // It is always safe to classify this as an integer type up to i64 that - // isn't larger than the structure. - return llvm::IntegerType::get(getVMContext(), - std::min(TySizeInBytes-SourceOffset, 8U)*8); -} - - -/// GetX86_64ByValArgumentPair - Given a high and low type that can ideally -/// be used as elements of a two register pair to pass or return, return a -/// first class aggregate to represent them. For example, if the low part of -/// a by-value argument should be passed as i32* and the high part as float, -/// return {i32*, float}. -static llvm::Type * -GetX86_64ByValArgumentPair(llvm::Type *Lo, llvm::Type *Hi, - const llvm::DataLayout &TD) { - // In order to correctly satisfy the ABI, we need to the high part to start - // at offset 8. If the high and low parts we inferred are both 4-byte types - // (e.g. i32 and i32) then the resultant struct type ({i32,i32}) won't have - // the second element at offset 8. Check for this: - unsigned LoSize = (unsigned)TD.getTypeAllocSize(Lo); - llvm::Align HiAlign = TD.getABITypeAlign(Hi); - unsigned HiStart = llvm::alignTo(LoSize, HiAlign); - assert(HiStart != 0 && HiStart <= 8 && "Invalid x86-64 argument pair!"); - - // To handle this, we have to increase the size of the low part so that the - // second element will start at an 8 byte offset. We can't increase the size - // of the second element because it might make us access off the end of the - // struct. - if (HiStart != 8) { - // There are usually two sorts of types the ABI generation code can produce - // for the low part of a pair that aren't 8 bytes in size: half, float or - // i8/i16/i32. This can also include pointers when they are 32-bit (X32 and - // NaCl). - // Promote these to a larger type. - if (Lo->isHalfTy() || Lo->isFloatTy()) - Lo = llvm::Type::getDoubleTy(Lo->getContext()); - else { - assert((Lo->isIntegerTy() || Lo->isPointerTy()) - && "Invalid/unknown lo type"); - Lo = llvm::Type::getInt64Ty(Lo->getContext()); - } - } - - llvm::StructType *Result = llvm::StructType::get(Lo, Hi); - - // Verify that the second element is at an 8-byte offset. - assert(TD.getStructLayout(Result)->getElementOffset(1) == 8 && - "Invalid x86-64 argument pair!"); - return Result; -} - -ABIArgInfo X86_64ABIInfo:: -classifyReturnType(QualType RetTy) const { - // AMD64-ABI 3.2.3p4: Rule 1. Classify the return type with the - // classification algorithm. - X86_64ABIInfo::Class Lo, Hi; - classify(RetTy, 0, Lo, Hi, /*isNamedArg*/ true); - - // Check some invariants. - assert((Hi != Memory || Lo == Memory) && "Invalid memory classification."); - assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification."); - - llvm::Type *ResType = nullptr; - switch (Lo) { - case NoClass: - if (Hi == NoClass) - return ABIArgInfo::getIgnore(); - // If the low part is just padding, it takes no register, leave ResType - // null. - assert((Hi == SSE || Hi == Integer || Hi == X87Up) && - "Unknown missing lo part"); - break; - - case SSEUp: - case X87Up: - llvm_unreachable("Invalid classification for lo word."); - - // AMD64-ABI 3.2.3p4: Rule 2. Types of class memory are returned via - // hidden argument. - case Memory: - return getIndirectReturnResult(RetTy); - - // AMD64-ABI 3.2.3p4: Rule 3. If the class is INTEGER, the next - // available register of the sequence %rax, %rdx is used. - case Integer: - ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0); - - // If we have a sign or zero extended integer, make sure to return Extend - // so that the parameter gets the right LLVM IR attributes. - if (Hi == NoClass && isa(ResType)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - if (RetTy->isIntegralOrEnumerationType() && - isPromotableIntegerTypeForABI(RetTy)) - return ABIArgInfo::getExtend(RetTy); - } - break; - - // AMD64-ABI 3.2.3p4: Rule 4. If the class is SSE, the next - // available SSE register of the sequence %xmm0, %xmm1 is used. - case SSE: - ResType = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0); - break; - - // AMD64-ABI 3.2.3p4: Rule 6. If the class is X87, the value is - // returned on the X87 stack in %st0 as 80-bit x87 number. - case X87: - ResType = llvm::Type::getX86_FP80Ty(getVMContext()); - break; - - // AMD64-ABI 3.2.3p4: Rule 8. If the class is COMPLEX_X87, the real - // part of the value is returned in %st0 and the imaginary part in - // %st1. - case ComplexX87: - assert(Hi == ComplexX87 && "Unexpected ComplexX87 classification."); - ResType = llvm::StructType::get(llvm::Type::getX86_FP80Ty(getVMContext()), - llvm::Type::getX86_FP80Ty(getVMContext())); - break; - } - - llvm::Type *HighPart = nullptr; - switch (Hi) { - // Memory was handled previously and X87 should - // never occur as a hi class. - case Memory: - case X87: - llvm_unreachable("Invalid classification for hi word."); - - case ComplexX87: // Previously handled. - case NoClass: - break; - - case Integer: - HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8); - if (Lo == NoClass) // Return HighPart at offset 8 in memory. - return ABIArgInfo::getDirect(HighPart, 8); - break; - case SSE: - HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8); - if (Lo == NoClass) // Return HighPart at offset 8 in memory. - return ABIArgInfo::getDirect(HighPart, 8); - break; - - // AMD64-ABI 3.2.3p4: Rule 5. If the class is SSEUP, the eightbyte - // is passed in the next available eightbyte chunk if the last used - // vector register. - // - // SSEUP should always be preceded by SSE, just widen. - case SSEUp: - assert(Lo == SSE && "Unexpected SSEUp classification."); - ResType = GetByteVectorType(RetTy); - break; - - // AMD64-ABI 3.2.3p4: Rule 7. If the class is X87UP, the value is - // returned together with the previous X87 value in %st0. - case X87Up: - // If X87Up is preceded by X87, we don't need to do - // anything. However, in some cases with unions it may not be - // preceded by X87. In such situations we follow gcc and pass the - // extra bits in an SSE reg. - if (Lo != X87) { - HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8); - if (Lo == NoClass) // Return HighPart at offset 8 in memory. - return ABIArgInfo::getDirect(HighPart, 8); - } - break; - } - - // If a high part was specified, merge it together with the low part. It is - // known to pass in the high eightbyte of the result. We do this by forming a - // first class struct aggregate with the high and low part: {low, high} - if (HighPart) - ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout()); - - return ABIArgInfo::getDirect(ResType); -} - -ABIArgInfo -X86_64ABIInfo::classifyArgumentType(QualType Ty, unsigned freeIntRegs, - unsigned &neededInt, unsigned &neededSSE, - bool isNamedArg, bool IsRegCall) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - X86_64ABIInfo::Class Lo, Hi; - classify(Ty, 0, Lo, Hi, isNamedArg, IsRegCall); - - // Check some invariants. - // FIXME: Enforce these by construction. - assert((Hi != Memory || Lo == Memory) && "Invalid memory classification."); - assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification."); - - neededInt = 0; - neededSSE = 0; - llvm::Type *ResType = nullptr; - switch (Lo) { - case NoClass: - if (Hi == NoClass) - return ABIArgInfo::getIgnore(); - // If the low part is just padding, it takes no register, leave ResType - // null. - assert((Hi == SSE || Hi == Integer || Hi == X87Up) && - "Unknown missing lo part"); - break; - - // AMD64-ABI 3.2.3p3: Rule 1. If the class is MEMORY, pass the argument - // on the stack. - case Memory: - - // AMD64-ABI 3.2.3p3: Rule 5. If the class is X87, X87UP or - // COMPLEX_X87, it is passed in memory. - case X87: - case ComplexX87: - if (getRecordArgABI(Ty, getCXXABI()) == CGCXXABI::RAA_Indirect) - ++neededInt; - return getIndirectResult(Ty, freeIntRegs); - - case SSEUp: - case X87Up: - llvm_unreachable("Invalid classification for lo word."); - - // AMD64-ABI 3.2.3p3: Rule 2. If the class is INTEGER, the next - // available register of the sequence %rdi, %rsi, %rdx, %rcx, %r8 - // and %r9 is used. - case Integer: - ++neededInt; - - // Pick an 8-byte type based on the preferred type. - ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 0, Ty, 0); - - // If we have a sign or zero extended integer, make sure to return Extend - // so that the parameter gets the right LLVM IR attributes. - if (Hi == NoClass && isa(ResType)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - if (Ty->isIntegralOrEnumerationType() && - isPromotableIntegerTypeForABI(Ty)) - return ABIArgInfo::getExtend(Ty); - } - - break; - - // AMD64-ABI 3.2.3p3: Rule 3. If the class is SSE, the next - // available SSE register is used, the registers are taken in the - // order from %xmm0 to %xmm7. - case SSE: { - llvm::Type *IRType = CGT.ConvertType(Ty); - ResType = GetSSETypeAtOffset(IRType, 0, Ty, 0); - ++neededSSE; - break; - } - } - - llvm::Type *HighPart = nullptr; - switch (Hi) { - // Memory was handled previously, ComplexX87 and X87 should - // never occur as hi classes, and X87Up must be preceded by X87, - // which is passed in memory. - case Memory: - case X87: - case ComplexX87: - llvm_unreachable("Invalid classification for hi word."); - - case NoClass: break; - - case Integer: - ++neededInt; - // Pick an 8-byte type based on the preferred type. - HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8); - - if (Lo == NoClass) // Pass HighPart at offset 8 in memory. - return ABIArgInfo::getDirect(HighPart, 8); - break; - - // X87Up generally doesn't occur here (long double is passed in - // memory), except in situations involving unions. - case X87Up: - case SSE: - HighPart = GetSSETypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8); - - if (Lo == NoClass) // Pass HighPart at offset 8 in memory. - return ABIArgInfo::getDirect(HighPart, 8); - - ++neededSSE; - break; - - // AMD64-ABI 3.2.3p3: Rule 4. If the class is SSEUP, the - // eightbyte is passed in the upper half of the last used SSE - // register. This only happens when 128-bit vectors are passed. - case SSEUp: - assert(Lo == SSE && "Unexpected SSEUp classification"); - ResType = GetByteVectorType(Ty); - break; - } - - // If a high part was specified, merge it together with the low part. It is - // known to pass in the high eightbyte of the result. We do this by forming a - // first class struct aggregate with the high and low part: {low, high} - if (HighPart) - ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout()); - - return ABIArgInfo::getDirect(ResType); -} - -ABIArgInfo -X86_64ABIInfo::classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt, - unsigned &NeededSSE, - unsigned &MaxVectorWidth) const { - auto RT = Ty->getAs(); - assert(RT && "classifyRegCallStructType only valid with struct types"); - - if (RT->getDecl()->hasFlexibleArrayMember()) - return getIndirectReturnResult(Ty); - - // Sum up bases - if (auto CXXRD = dyn_cast(RT->getDecl())) { - if (CXXRD->isDynamicClass()) { - NeededInt = NeededSSE = 0; - return getIndirectReturnResult(Ty); - } - - for (const auto &I : CXXRD->bases()) - if (classifyRegCallStructTypeImpl(I.getType(), NeededInt, NeededSSE, - MaxVectorWidth) - .isIndirect()) { - NeededInt = NeededSSE = 0; - return getIndirectReturnResult(Ty); - } - } - - // Sum up members - for (const auto *FD : RT->getDecl()->fields()) { - QualType MTy = FD->getType(); - if (MTy->isRecordType() && !MTy->isUnionType()) { - if (classifyRegCallStructTypeImpl(MTy, NeededInt, NeededSSE, - MaxVectorWidth) - .isIndirect()) { - NeededInt = NeededSSE = 0; - return getIndirectReturnResult(Ty); - } - } else { - unsigned LocalNeededInt, LocalNeededSSE; - if (classifyArgumentType(MTy, UINT_MAX, LocalNeededInt, LocalNeededSSE, - true, true) - .isIndirect()) { - NeededInt = NeededSSE = 0; - return getIndirectReturnResult(Ty); - } - if (const auto *AT = getContext().getAsConstantArrayType(MTy)) - MTy = AT->getElementType(); - if (const auto *VT = MTy->getAs()) - if (getContext().getTypeSize(VT) > MaxVectorWidth) - MaxVectorWidth = getContext().getTypeSize(VT); - NeededInt += LocalNeededInt; - NeededSSE += LocalNeededSSE; - } - } - - return ABIArgInfo::getDirect(); -} - -ABIArgInfo -X86_64ABIInfo::classifyRegCallStructType(QualType Ty, unsigned &NeededInt, - unsigned &NeededSSE, - unsigned &MaxVectorWidth) const { - - NeededInt = 0; - NeededSSE = 0; - MaxVectorWidth = 0; - - return classifyRegCallStructTypeImpl(Ty, NeededInt, NeededSSE, - MaxVectorWidth); -} - -void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const { - - const unsigned CallingConv = FI.getCallingConvention(); - // It is possible to force Win64 calling convention on any x86_64 target by - // using __attribute__((ms_abi)). In such case to correctly emit Win64 - // compatible code delegate this call to WinX86_64ABIInfo::computeInfo. - if (CallingConv == llvm::CallingConv::Win64) { - WinX86_64ABIInfo Win64ABIInfo(CGT, AVXLevel); - Win64ABIInfo.computeInfo(FI); - return; - } - - bool IsRegCall = CallingConv == llvm::CallingConv::X86_RegCall; - - // Keep track of the number of assigned registers. - unsigned FreeIntRegs = IsRegCall ? 11 : 6; - unsigned FreeSSERegs = IsRegCall ? 16 : 8; - unsigned NeededInt = 0, NeededSSE = 0, MaxVectorWidth = 0; - - if (!::classifyReturnType(getCXXABI(), FI, *this)) { - if (IsRegCall && FI.getReturnType()->getTypePtr()->isRecordType() && - !FI.getReturnType()->getTypePtr()->isUnionType()) { - FI.getReturnInfo() = classifyRegCallStructType( - FI.getReturnType(), NeededInt, NeededSSE, MaxVectorWidth); - if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) { - FreeIntRegs -= NeededInt; - FreeSSERegs -= NeededSSE; - } else { - FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType()); - } - } else if (IsRegCall && FI.getReturnType()->getAs() && - getContext().getCanonicalType(FI.getReturnType() - ->getAs() - ->getElementType()) == - getContext().LongDoubleTy) - // Complex Long Double Type is passed in Memory when Regcall - // calling convention is used. - FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType()); - else - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - } - - // If the return value is indirect, then the hidden argument is consuming one - // integer register. - if (FI.getReturnInfo().isIndirect()) - --FreeIntRegs; - else if (NeededSSE && MaxVectorWidth > 0) - FI.setMaxVectorWidth(MaxVectorWidth); - - // The chain argument effectively gives us another free register. - if (FI.isChainCall()) - ++FreeIntRegs; - - unsigned NumRequiredArgs = FI.getNumRequiredArgs(); - // AMD64-ABI 3.2.3p3: Once arguments are classified, the registers - // get assigned (in left-to-right order) for passing as follows... - unsigned ArgNo = 0; - for (CGFunctionInfo::arg_iterator it = FI.arg_begin(), ie = FI.arg_end(); - it != ie; ++it, ++ArgNo) { - bool IsNamedArg = ArgNo < NumRequiredArgs; - - if (IsRegCall && it->type->isStructureOrClassType()) - it->info = classifyRegCallStructType(it->type, NeededInt, NeededSSE, - MaxVectorWidth); - else - it->info = classifyArgumentType(it->type, FreeIntRegs, NeededInt, - NeededSSE, IsNamedArg); - - // AMD64-ABI 3.2.3p3: If there are no registers available for any - // eightbyte of an argument, the whole argument is passed on the - // stack. If registers have already been assigned for some - // eightbytes of such an argument, the assignments get reverted. - if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) { - FreeIntRegs -= NeededInt; - FreeSSERegs -= NeededSSE; - if (MaxVectorWidth > FI.getMaxVectorWidth()) - FI.setMaxVectorWidth(MaxVectorWidth); - } else { - it->info = getIndirectResult(it->type, FreeIntRegs); - } - } -} - -static Address EmitX86_64VAArgFromMemory(CodeGenFunction &CGF, - Address VAListAddr, QualType Ty) { - Address overflow_arg_area_p = - CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_p"); - llvm::Value *overflow_arg_area = - CGF.Builder.CreateLoad(overflow_arg_area_p, "overflow_arg_area"); - - // AMD64-ABI 3.5.7p5: Step 7. Align l->overflow_arg_area upwards to a 16 - // byte boundary if alignment needed by type exceeds 8 byte boundary. - // It isn't stated explicitly in the standard, but in practice we use - // alignment greater than 16 where necessary. - CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty); - if (Align > CharUnits::fromQuantity(8)) { - overflow_arg_area = emitRoundPointerUpToAlignment(CGF, overflow_arg_area, - Align); - } - - // AMD64-ABI 3.5.7p5: Step 8. Fetch type from l->overflow_arg_area. - llvm::Type *LTy = CGF.ConvertTypeForMem(Ty); - llvm::Value *Res = - CGF.Builder.CreateBitCast(overflow_arg_area, - llvm::PointerType::getUnqual(LTy)); - - // AMD64-ABI 3.5.7p5: Step 9. Set l->overflow_arg_area to: - // l->overflow_arg_area + sizeof(type). - // AMD64-ABI 3.5.7p5: Step 10. Align l->overflow_arg_area upwards to - // an 8 byte boundary. - - uint64_t SizeInBytes = (CGF.getContext().getTypeSize(Ty) + 7) / 8; - llvm::Value *Offset = - llvm::ConstantInt::get(CGF.Int32Ty, (SizeInBytes + 7) & ~7); - overflow_arg_area = CGF.Builder.CreateGEP(CGF.Int8Ty, overflow_arg_area, - Offset, "overflow_arg_area.next"); - CGF.Builder.CreateStore(overflow_arg_area, overflow_arg_area_p); - - // AMD64-ABI 3.5.7p5: Step 11. Return the fetched type. - return Address(Res, LTy, Align); -} - -Address X86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - // Assume that va_list type is correct; should be pointer to LLVM type: - // struct { - // i32 gp_offset; - // i32 fp_offset; - // i8* overflow_arg_area; - // i8* reg_save_area; - // }; - unsigned neededInt, neededSSE; - - Ty = getContext().getCanonicalType(Ty); - ABIArgInfo AI = classifyArgumentType(Ty, 0, neededInt, neededSSE, - /*isNamedArg*/false); - - // AMD64-ABI 3.5.7p5: Step 1. Determine whether type may be passed - // in the registers. If not go to step 7. - if (!neededInt && !neededSSE) - return EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty); - - // AMD64-ABI 3.5.7p5: Step 2. Compute num_gp to hold the number of - // general purpose registers needed to pass type and num_fp to hold - // the number of floating point registers needed. - - // AMD64-ABI 3.5.7p5: Step 3. Verify whether arguments fit into - // registers. In the case: l->gp_offset > 48 - num_gp * 8 or - // l->fp_offset > 304 - num_fp * 16 go to step 7. - // - // NOTE: 304 is a typo, there are (6 * 8 + 8 * 16) = 176 bytes of - // register save space). - - llvm::Value *InRegs = nullptr; - Address gp_offset_p = Address::invalid(), fp_offset_p = Address::invalid(); - llvm::Value *gp_offset = nullptr, *fp_offset = nullptr; - if (neededInt) { - gp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "gp_offset_p"); - gp_offset = CGF.Builder.CreateLoad(gp_offset_p, "gp_offset"); - InRegs = llvm::ConstantInt::get(CGF.Int32Ty, 48 - neededInt * 8); - InRegs = CGF.Builder.CreateICmpULE(gp_offset, InRegs, "fits_in_gp"); - } - - if (neededSSE) { - fp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 1, "fp_offset_p"); - fp_offset = CGF.Builder.CreateLoad(fp_offset_p, "fp_offset"); - llvm::Value *FitsInFP = - llvm::ConstantInt::get(CGF.Int32Ty, 176 - neededSSE * 16); - FitsInFP = CGF.Builder.CreateICmpULE(fp_offset, FitsInFP, "fits_in_fp"); - InRegs = InRegs ? CGF.Builder.CreateAnd(InRegs, FitsInFP) : FitsInFP; - } - - llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); - llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem"); - llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); - CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock); - - // Emit code to load the value if it was passed in registers. - - CGF.EmitBlock(InRegBlock); - - // AMD64-ABI 3.5.7p5: Step 4. Fetch type from l->reg_save_area with - // an offset of l->gp_offset and/or l->fp_offset. This may require - // copying to a temporary location in case the parameter is passed - // in different register classes or requires an alignment greater - // than 8 for general purpose registers and 16 for XMM registers. - // - // FIXME: This really results in shameful code when we end up needing to - // collect arguments from different places; often what should result in a - // simple assembling of a structure from scattered addresses has many more - // loads than necessary. Can we clean this up? - llvm::Type *LTy = CGF.ConvertTypeForMem(Ty); - llvm::Value *RegSaveArea = CGF.Builder.CreateLoad( - CGF.Builder.CreateStructGEP(VAListAddr, 3), "reg_save_area"); - - Address RegAddr = Address::invalid(); - if (neededInt && neededSSE) { - // FIXME: Cleanup. - assert(AI.isDirect() && "Unexpected ABI info for mixed regs"); - llvm::StructType *ST = cast(AI.getCoerceToType()); - Address Tmp = CGF.CreateMemTemp(Ty); - Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST); - assert(ST->getNumElements() == 2 && "Unexpected ABI info for mixed regs"); - llvm::Type *TyLo = ST->getElementType(0); - llvm::Type *TyHi = ST->getElementType(1); - assert((TyLo->isFPOrFPVectorTy() ^ TyHi->isFPOrFPVectorTy()) && - "Unexpected ABI info for mixed regs"); - llvm::Type *PTyLo = llvm::PointerType::getUnqual(TyLo); - llvm::Type *PTyHi = llvm::PointerType::getUnqual(TyHi); - llvm::Value *GPAddr = - CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset); - llvm::Value *FPAddr = - CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset); - llvm::Value *RegLoAddr = TyLo->isFPOrFPVectorTy() ? FPAddr : GPAddr; - llvm::Value *RegHiAddr = TyLo->isFPOrFPVectorTy() ? GPAddr : FPAddr; - - // Copy the first element. - // FIXME: Our choice of alignment here and below is probably pessimistic. - llvm::Value *V = CGF.Builder.CreateAlignedLoad( - TyLo, CGF.Builder.CreateBitCast(RegLoAddr, PTyLo), - CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyLo))); - CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0)); - - // Copy the second element. - V = CGF.Builder.CreateAlignedLoad( - TyHi, CGF.Builder.CreateBitCast(RegHiAddr, PTyHi), - CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyHi))); - CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1)); - - RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy); - } else if (neededInt) { - RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset), - CGF.Int8Ty, CharUnits::fromQuantity(8)); - RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy); - - // Copy to a temporary if necessary to ensure the appropriate alignment. - auto TInfo = getContext().getTypeInfoInChars(Ty); - uint64_t TySize = TInfo.Width.getQuantity(); - CharUnits TyAlign = TInfo.Align; - - // Copy into a temporary if the type is more aligned than the - // register save area. - if (TyAlign.getQuantity() > 8) { - Address Tmp = CGF.CreateMemTemp(Ty); - CGF.Builder.CreateMemCpy(Tmp, RegAddr, TySize, false); - RegAddr = Tmp; - } - - } else if (neededSSE == 1) { - RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset), - CGF.Int8Ty, CharUnits::fromQuantity(16)); - RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy); - } else { - assert(neededSSE == 2 && "Invalid number of needed registers!"); - // SSE registers are spaced 16 bytes apart in the register save - // area, we need to collect the two eightbytes together. - // The ABI isn't explicit about this, but it seems reasonable - // to assume that the slots are 16-byte aligned, since the stack is - // naturally 16-byte aligned and the prologue is expected to store - // all the SSE registers to the RSA. - Address RegAddrLo = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, - fp_offset), - CGF.Int8Ty, CharUnits::fromQuantity(16)); - Address RegAddrHi = - CGF.Builder.CreateConstInBoundsByteGEP(RegAddrLo, - CharUnits::fromQuantity(16)); - llvm::Type *ST = AI.canHaveCoerceToType() - ? AI.getCoerceToType() - : llvm::StructType::get(CGF.DoubleTy, CGF.DoubleTy); - llvm::Value *V; - Address Tmp = CGF.CreateMemTemp(Ty); - Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST); - V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast( - RegAddrLo, ST->getStructElementType(0))); - CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0)); - V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast( - RegAddrHi, ST->getStructElementType(1))); - CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1)); - - RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy); - } - - // AMD64-ABI 3.5.7p5: Step 5. Set: - // l->gp_offset = l->gp_offset + num_gp * 8 - // l->fp_offset = l->fp_offset + num_fp * 16. - if (neededInt) { - llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededInt * 8); - CGF.Builder.CreateStore(CGF.Builder.CreateAdd(gp_offset, Offset), - gp_offset_p); - } - if (neededSSE) { - llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededSSE * 16); - CGF.Builder.CreateStore(CGF.Builder.CreateAdd(fp_offset, Offset), - fp_offset_p); - } - CGF.EmitBranch(ContBlock); - - // Emit code to load the value if it was passed in memory. - - CGF.EmitBlock(InMemBlock); - Address MemAddr = EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty); - - // Return the appropriate result. - - CGF.EmitBlock(ContBlock); - Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock, - "vaarg.addr"); - return ResAddr; -} - -Address X86_64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is - // not 1, 2, 4, or 8 bytes, must be passed by reference." - uint64_t Width = getContext().getTypeSize(Ty); - bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width); - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, - CGF.getContext().getTypeInfoInChars(Ty), - CharUnits::fromQuantity(8), - /*allowHigherAlign*/ false); -} - -ABIArgInfo WinX86_64ABIInfo::reclassifyHvaArgForVectorCall( - QualType Ty, unsigned &FreeSSERegs, const ABIArgInfo ¤t) const { - const Type *Base = nullptr; - uint64_t NumElts = 0; - - if (!Ty->isBuiltinType() && !Ty->isVectorType() && - isHomogeneousAggregate(Ty, Base, NumElts) && FreeSSERegs >= NumElts) { - FreeSSERegs -= NumElts; - return getDirectX86Hva(); - } - return current; -} - -ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty, unsigned &FreeSSERegs, - bool IsReturnType, bool IsVectorCall, - bool IsRegCall) const { - - if (Ty->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - TypeInfo Info = getContext().getTypeInfo(Ty); - uint64_t Width = Info.Width; - CharUnits Align = getContext().toCharUnitsFromBits(Info.Align); - - const RecordType *RT = Ty->getAs(); - if (RT) { - if (!IsReturnType) { - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - } - - if (RT->getDecl()->hasFlexibleArrayMember()) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - - } - - const Type *Base = nullptr; - uint64_t NumElts = 0; - // vectorcall adds the concept of a homogenous vector aggregate, similar to - // other targets. - if ((IsVectorCall || IsRegCall) && - isHomogeneousAggregate(Ty, Base, NumElts)) { - if (IsRegCall) { - if (FreeSSERegs >= NumElts) { - FreeSSERegs -= NumElts; - if (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType()) - return ABIArgInfo::getDirect(); - return ABIArgInfo::getExpand(); - } - return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); - } else if (IsVectorCall) { - if (FreeSSERegs >= NumElts && - (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType())) { - FreeSSERegs -= NumElts; - return ABIArgInfo::getDirect(); - } else if (IsReturnType) { - return ABIArgInfo::getExpand(); - } else if (!Ty->isBuiltinType() && !Ty->isVectorType()) { - // HVAs are delayed and reclassified in the 2nd step. - return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); - } - } - } - - if (Ty->isMemberPointerType()) { - // If the member pointer is represented by an LLVM int or ptr, pass it - // directly. - llvm::Type *LLTy = CGT.ConvertType(Ty); - if (LLTy->isPointerTy() || LLTy->isIntegerTy()) - return ABIArgInfo::getDirect(); - } - - if (RT || Ty->isAnyComplexType() || Ty->isMemberPointerType()) { - // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is - // not 1, 2, 4, or 8 bytes, must be passed by reference." - if (Width > 64 || !llvm::isPowerOf2_64(Width)) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - - // Otherwise, coerce it to a small integer. - return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Width)); - } - - if (const BuiltinType *BT = Ty->getAs()) { - switch (BT->getKind()) { - case BuiltinType::Bool: - // Bool type is always extended to the ABI, other builtin types are not - // extended. - return ABIArgInfo::getExtend(Ty); - - case BuiltinType::LongDouble: - // Mingw64 GCC uses the old 80 bit extended precision floating point - // unit. It passes them indirectly through memory. - if (IsMingw64) { - const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat(); - if (LDF == &llvm::APFloat::x87DoubleExtended()) - return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); - } - break; - - case BuiltinType::Int128: - case BuiltinType::UInt128: - // If it's a parameter type, the normal ABI rule is that arguments larger - // than 8 bytes are passed indirectly. GCC follows it. We follow it too, - // even though it isn't particularly efficient. - if (!IsReturnType) - return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); - - // Mingw64 GCC returns i128 in XMM0. Coerce to v2i64 to handle that. - // Clang matches them for compatibility. - return ABIArgInfo::getDirect(llvm::FixedVectorType::get( - llvm::Type::getInt64Ty(getVMContext()), 2)); - - default: - break; - } - } - - if (Ty->isBitIntType()) { - // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is - // not 1, 2, 4, or 8 bytes, must be passed by reference." - // However, non-power-of-two bit-precise integers will be passed as 1, 2, 4, - // or 8 bytes anyway as long is it fits in them, so we don't have to check - // the power of 2. - if (Width <= 64) - return ABIArgInfo::getDirect(); - return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); - } - - return ABIArgInfo::getDirect(); -} - -void WinX86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const { - const unsigned CC = FI.getCallingConvention(); - bool IsVectorCall = CC == llvm::CallingConv::X86_VectorCall; - bool IsRegCall = CC == llvm::CallingConv::X86_RegCall; - - // If __attribute__((sysv_abi)) is in use, use the SysV argument - // classification rules. - if (CC == llvm::CallingConv::X86_64_SysV) { - X86_64ABIInfo SysVABIInfo(CGT, AVXLevel); - SysVABIInfo.computeInfo(FI); - return; - } - - unsigned FreeSSERegs = 0; - if (IsVectorCall) { - // We can use up to 4 SSE return registers with vectorcall. - FreeSSERegs = 4; - } else if (IsRegCall) { - // RegCall gives us 16 SSE registers. - FreeSSERegs = 16; - } - - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classify(FI.getReturnType(), FreeSSERegs, true, - IsVectorCall, IsRegCall); - - if (IsVectorCall) { - // We can use up to 6 SSE register parameters with vectorcall. - FreeSSERegs = 6; - } else if (IsRegCall) { - // RegCall gives us 16 SSE registers, we can reuse the return registers. - FreeSSERegs = 16; - } - - unsigned ArgNum = 0; - unsigned ZeroSSERegs = 0; - for (auto &I : FI.arguments()) { - // Vectorcall in x64 only permits the first 6 arguments to be passed as - // XMM/YMM registers. After the sixth argument, pretend no vector - // registers are left. - unsigned *MaybeFreeSSERegs = - (IsVectorCall && ArgNum >= 6) ? &ZeroSSERegs : &FreeSSERegs; - I.info = - classify(I.type, *MaybeFreeSSERegs, false, IsVectorCall, IsRegCall); - ++ArgNum; - } - - if (IsVectorCall) { - // For vectorcall, assign aggregate HVAs to any free vector registers in a - // second pass. - for (auto &I : FI.arguments()) - I.info = reclassifyHvaArgForVectorCall(I.type, FreeSSERegs, I.info); - } -} - -Address WinX86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is - // not 1, 2, 4, or 8 bytes, must be passed by reference." - uint64_t Width = getContext().getTypeSize(Ty); - bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width); - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, - CGF.getContext().getTypeInfoInChars(Ty), - CharUnits::fromQuantity(8), - /*allowHigherAlign*/ false); -} - -static bool PPC_initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address, bool Is64Bit, - bool IsAIX) { - // This is calculated from the LLVM and GCC tables and verified - // against gcc output. AFAIK all PPC ABIs use the same encoding. - - CodeGen::CGBuilderTy &Builder = CGF.Builder; - - llvm::IntegerType *i8 = CGF.Int8Ty; - llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4); - llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8); - llvm::Value *Sixteen8 = llvm::ConstantInt::get(i8, 16); - - // 0-31: r0-31, the 4-byte or 8-byte general-purpose registers - AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 0, 31); - - // 32-63: fp0-31, the 8-byte floating-point registers - AssignToArrayRange(Builder, Address, Eight8, 32, 63); - - // 64-67 are various 4-byte or 8-byte special-purpose registers: - // 64: mq - // 65: lr - // 66: ctr - // 67: ap - AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 64, 67); - - // 68-76 are various 4-byte special-purpose registers: - // 68-75 cr0-7 - // 76: xer - AssignToArrayRange(Builder, Address, Four8, 68, 76); - - // 77-108: v0-31, the 16-byte vector registers - AssignToArrayRange(Builder, Address, Sixteen8, 77, 108); - - // 109: vrsave - // 110: vscr - AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 109, 110); - - // AIX does not utilize the rest of the registers. - if (IsAIX) - return false; - - // 111: spe_acc - // 112: spefscr - // 113: sfp - AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 111, 113); - - if (!Is64Bit) - return false; - - // TODO: Need to verify if these registers are used on 64 bit AIX with Power8 - // or above CPU. - // 64-bit only registers: - // 114: tfhar - // 115: tfiar - // 116: texasr - AssignToArrayRange(Builder, Address, Eight8, 114, 116); - - return false; -} - -// AIX -namespace { -/// AIXABIInfo - The AIX XCOFF ABI information. -class AIXABIInfo : public ABIInfo { - const bool Is64Bit; - const unsigned PtrByteSize; - CharUnits getParamTypeAlignment(QualType Ty) const; - -public: - AIXABIInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit) - : ABIInfo(CGT), Is64Bit(Is64Bit), PtrByteSize(Is64Bit ? 8 : 4) {} - - bool isPromotableTypeForABI(QualType Ty) const; - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType Ty) const; - - void computeInfo(CGFunctionInfo &FI) const override { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); - } - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -class AIXTargetCodeGenInfo : public TargetCodeGenInfo { - const bool Is64Bit; - -public: - AIXTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit) - : TargetCodeGenInfo(std::make_unique(CGT, Is64Bit)), - Is64Bit(Is64Bit) {} - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - return 1; // r1 is the dedicated stack pointer - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; -}; -} // namespace - -// Return true if the ABI requires Ty to be passed sign- or zero- -// extended to 32/64 bits. -bool AIXABIInfo::isPromotableTypeForABI(QualType Ty) const { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // Promotable integer types are required to be promoted by the ABI. - if (getContext().isPromotableIntegerType(Ty)) - return true; - - if (!Is64Bit) - return false; - - // For 64 bit mode, in addition to the usual promotable integer types, we also - // need to extend all 32-bit types, since the ABI requires promotion to 64 - // bits. - if (const BuiltinType *BT = Ty->getAs()) - switch (BT->getKind()) { - case BuiltinType::Int: - case BuiltinType::UInt: - return true; - default: - break; - } - - return false; -} - -ABIArgInfo AIXABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isAnyComplexType()) - return ABIArgInfo::getDirect(); - - if (RetTy->isVectorType()) - return ABIArgInfo::getDirect(); - - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (isAggregateTypeForABI(RetTy)) - return getNaturalAlignIndirect(RetTy); - - return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -ABIArgInfo AIXABIInfo::classifyArgumentType(QualType Ty) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - if (Ty->isAnyComplexType()) - return ABIArgInfo::getDirect(); - - if (Ty->isVectorType()) - return ABIArgInfo::getDirect(); - - if (isAggregateTypeForABI(Ty)) { - // Records with non-trivial destructors/copy-constructors should not be - // passed by value. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - CharUnits CCAlign = getParamTypeAlignment(Ty); - CharUnits TyAlign = getContext().getTypeAlignInChars(Ty); - - return ABIArgInfo::getIndirect(CCAlign, /*ByVal*/ true, - /*Realign*/ TyAlign > CCAlign); - } - - return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); -} - -CharUnits AIXABIInfo::getParamTypeAlignment(QualType Ty) const { - // Complex types are passed just like their elements. - if (const ComplexType *CTy = Ty->getAs()) - Ty = CTy->getElementType(); - - if (Ty->isVectorType()) - return CharUnits::fromQuantity(16); - - // If the structure contains a vector type, the alignment is 16. - if (isRecordWithSIMDVectorType(getContext(), Ty)) - return CharUnits::fromQuantity(16); - - return CharUnits::fromQuantity(PtrByteSize); -} - -Address AIXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - - auto TypeInfo = getContext().getTypeInfoInChars(Ty); - TypeInfo.Align = getParamTypeAlignment(Ty); - - CharUnits SlotSize = CharUnits::fromQuantity(PtrByteSize); - - // If we have a complex type and the base type is smaller than the register - // size, the ABI calls for the real and imaginary parts to be right-adjusted - // in separate words in 32bit mode or doublewords in 64bit mode. However, - // Clang expects us to produce a pointer to a structure with the two parts - // packed tightly. So generate loads of the real and imaginary parts relative - // to the va_list pointer, and store them to a temporary structure. We do the - // same as the PPC64ABI here. - if (const ComplexType *CTy = Ty->getAs()) { - CharUnits EltSize = TypeInfo.Width / 2; - if (EltSize < SlotSize) - return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy); - } - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo, - SlotSize, /*AllowHigher*/ true); -} - -bool AIXTargetCodeGenInfo::initDwarfEHRegSizeTable( - CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const { - return PPC_initDwarfEHRegSizeTable(CGF, Address, Is64Bit, /*IsAIX*/ true); -} - -// PowerPC-32 -namespace { -/// PPC32_SVR4_ABIInfo - The 32-bit PowerPC ELF (SVR4) ABI information. -class PPC32_SVR4_ABIInfo : public DefaultABIInfo { - bool IsSoftFloatABI; - bool IsRetSmallStructInRegABI; - - CharUnits getParamTypeAlignment(QualType Ty) const; - -public: - PPC32_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, bool SoftFloatABI, - bool RetSmallStructInRegABI) - : DefaultABIInfo(CGT), IsSoftFloatABI(SoftFloatABI), - IsRetSmallStructInRegABI(RetSmallStructInRegABI) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const; - - void computeInfo(CGFunctionInfo &FI) const override { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); - } - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -class PPC32TargetCodeGenInfo : public TargetCodeGenInfo { -public: - PPC32TargetCodeGenInfo(CodeGenTypes &CGT, bool SoftFloatABI, - bool RetSmallStructInRegABI) - : TargetCodeGenInfo(std::make_unique( - CGT, SoftFloatABI, RetSmallStructInRegABI)) {} - - static bool isStructReturnInRegABI(const llvm::Triple &Triple, - const CodeGenOptions &Opts); - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - // This is recovered from gcc output. - return 1; // r1 is the dedicated stack pointer - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; -}; -} - -CharUnits PPC32_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const { - // Complex types are passed just like their elements. - if (const ComplexType *CTy = Ty->getAs()) - Ty = CTy->getElementType(); - - if (Ty->isVectorType()) - return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16 - : 4); - - // For single-element float/vector structs, we consider the whole type - // to have the same alignment requirements as its single element. - const Type *AlignTy = nullptr; - if (const Type *EltType = isSingleElementStruct(Ty, getContext())) { - const BuiltinType *BT = EltType->getAs(); - if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) || - (BT && BT->isFloatingPoint())) - AlignTy = EltType; - } - - if (AlignTy) - return CharUnits::fromQuantity(AlignTy->isVectorType() ? 16 : 4); - return CharUnits::fromQuantity(4); -} - -ABIArgInfo PPC32_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const { - uint64_t Size; - - // -msvr4-struct-return puts small aggregates in GPR3 and GPR4. - if (isAggregateTypeForABI(RetTy) && IsRetSmallStructInRegABI && - (Size = getContext().getTypeSize(RetTy)) <= 64) { - // System V ABI (1995), page 3-22, specified: - // > A structure or union whose size is less than or equal to 8 bytes - // > shall be returned in r3 and r4, as if it were first stored in the - // > 8-byte aligned memory area and then the low addressed word were - // > loaded into r3 and the high-addressed word into r4. Bits beyond - // > the last member of the structure or union are not defined. - // - // GCC for big-endian PPC32 inserts the pad before the first member, - // not "beyond the last member" of the struct. To stay compatible - // with GCC, we coerce the struct to an integer of the same size. - // LLVM will extend it and return i32 in r3, or i64 in r3:r4. - if (Size == 0) - return ABIArgInfo::getIgnore(); - else { - llvm::Type *CoerceTy = llvm::Type::getIntNTy(getVMContext(), Size); - return ABIArgInfo::getDirect(CoerceTy); - } - } - - return DefaultABIInfo::classifyReturnType(RetTy); -} - -// TODO: this implementation is now likely redundant with -// DefaultABIInfo::EmitVAArg. -Address PPC32_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAList, - QualType Ty) const { - if (getTarget().getTriple().isOSDarwin()) { - auto TI = getContext().getTypeInfoInChars(Ty); - TI.Align = getParamTypeAlignment(Ty); - - CharUnits SlotSize = CharUnits::fromQuantity(4); - return emitVoidPtrVAArg(CGF, VAList, Ty, - classifyArgumentType(Ty).isIndirect(), TI, SlotSize, - /*AllowHigherAlign=*/true); - } - - const unsigned OverflowLimit = 8; - if (const ComplexType *CTy = Ty->getAs()) { - // TODO: Implement this. For now ignore. - (void)CTy; - return Address::invalid(); // FIXME? - } - - // struct __va_list_tag { - // unsigned char gpr; - // unsigned char fpr; - // unsigned short reserved; - // void *overflow_arg_area; - // void *reg_save_area; - // }; - - bool isI64 = Ty->isIntegerType() && getContext().getTypeSize(Ty) == 64; - bool isInt = !Ty->isFloatingType(); - bool isF64 = Ty->isFloatingType() && getContext().getTypeSize(Ty) == 64; - - // All aggregates are passed indirectly? That doesn't seem consistent - // with the argument-lowering code. - bool isIndirect = isAggregateTypeForABI(Ty); - - CGBuilderTy &Builder = CGF.Builder; - - // The calling convention either uses 1-2 GPRs or 1 FPR. - Address NumRegsAddr = Address::invalid(); - if (isInt || IsSoftFloatABI) { - NumRegsAddr = Builder.CreateStructGEP(VAList, 0, "gpr"); - } else { - NumRegsAddr = Builder.CreateStructGEP(VAList, 1, "fpr"); - } - - llvm::Value *NumRegs = Builder.CreateLoad(NumRegsAddr, "numUsedRegs"); - - // "Align" the register count when TY is i64. - if (isI64 || (isF64 && IsSoftFloatABI)) { - NumRegs = Builder.CreateAdd(NumRegs, Builder.getInt8(1)); - NumRegs = Builder.CreateAnd(NumRegs, Builder.getInt8((uint8_t) ~1U)); - } - - llvm::Value *CC = - Builder.CreateICmpULT(NumRegs, Builder.getInt8(OverflowLimit), "cond"); - - llvm::BasicBlock *UsingRegs = CGF.createBasicBlock("using_regs"); - llvm::BasicBlock *UsingOverflow = CGF.createBasicBlock("using_overflow"); - llvm::BasicBlock *Cont = CGF.createBasicBlock("cont"); - - Builder.CreateCondBr(CC, UsingRegs, UsingOverflow); - - llvm::Type *DirectTy = CGF.ConvertType(Ty), *ElementTy = DirectTy; - if (isIndirect) - DirectTy = llvm::PointerType::getUnqual(CGF.getLLVMContext()); - - // Case 1: consume registers. - Address RegAddr = Address::invalid(); - { - CGF.EmitBlock(UsingRegs); - - Address RegSaveAreaPtr = Builder.CreateStructGEP(VAList, 4); - RegAddr = Address(Builder.CreateLoad(RegSaveAreaPtr), CGF.Int8Ty, - CharUnits::fromQuantity(8)); - assert(RegAddr.getElementType() == CGF.Int8Ty); - - // Floating-point registers start after the general-purpose registers. - if (!(isInt || IsSoftFloatABI)) { - RegAddr = Builder.CreateConstInBoundsByteGEP(RegAddr, - CharUnits::fromQuantity(32)); - } - - // Get the address of the saved value by scaling the number of - // registers we've used by the number of - CharUnits RegSize = CharUnits::fromQuantity((isInt || IsSoftFloatABI) ? 4 : 8); - llvm::Value *RegOffset = - Builder.CreateMul(NumRegs, Builder.getInt8(RegSize.getQuantity())); - RegAddr = Address( - Builder.CreateInBoundsGEP(CGF.Int8Ty, RegAddr.getPointer(), RegOffset), - CGF.Int8Ty, RegAddr.getAlignment().alignmentOfArrayElement(RegSize)); - RegAddr = Builder.CreateElementBitCast(RegAddr, DirectTy); - - // Increase the used-register count. - NumRegs = - Builder.CreateAdd(NumRegs, - Builder.getInt8((isI64 || (isF64 && IsSoftFloatABI)) ? 2 : 1)); - Builder.CreateStore(NumRegs, NumRegsAddr); - - CGF.EmitBranch(Cont); - } - - // Case 2: consume space in the overflow area. - Address MemAddr = Address::invalid(); - { - CGF.EmitBlock(UsingOverflow); - - Builder.CreateStore(Builder.getInt8(OverflowLimit), NumRegsAddr); - - // Everything in the overflow area is rounded up to a size of at least 4. - CharUnits OverflowAreaAlign = CharUnits::fromQuantity(4); - - CharUnits Size; - if (!isIndirect) { - auto TypeInfo = CGF.getContext().getTypeInfoInChars(Ty); - Size = TypeInfo.Width.alignTo(OverflowAreaAlign); - } else { - Size = CGF.getPointerSize(); - } - - Address OverflowAreaAddr = Builder.CreateStructGEP(VAList, 3); - Address OverflowArea = - Address(Builder.CreateLoad(OverflowAreaAddr, "argp.cur"), CGF.Int8Ty, - OverflowAreaAlign); - // Round up address of argument to alignment - CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty); - if (Align > OverflowAreaAlign) { - llvm::Value *Ptr = OverflowArea.getPointer(); - OverflowArea = Address(emitRoundPointerUpToAlignment(CGF, Ptr, Align), - OverflowArea.getElementType(), Align); - } - - MemAddr = Builder.CreateElementBitCast(OverflowArea, DirectTy); - - // Increase the overflow area. - OverflowArea = Builder.CreateConstInBoundsByteGEP(OverflowArea, Size); - Builder.CreateStore(OverflowArea.getPointer(), OverflowAreaAddr); - CGF.EmitBranch(Cont); - } - - CGF.EmitBlock(Cont); - - // Merge the cases with a phi. - Address Result = emitMergePHI(CGF, RegAddr, UsingRegs, MemAddr, UsingOverflow, - "vaarg.addr"); - - // Load the pointer if the argument was passed indirectly. - if (isIndirect) { - Result = Address(Builder.CreateLoad(Result, "aggr"), ElementTy, - getContext().getTypeAlignInChars(Ty)); - } - - return Result; -} - -bool PPC32TargetCodeGenInfo::isStructReturnInRegABI( - const llvm::Triple &Triple, const CodeGenOptions &Opts) { - assert(Triple.isPPC32()); - - switch (Opts.getStructReturnConvention()) { - case CodeGenOptions::SRCK_Default: - break; - case CodeGenOptions::SRCK_OnStack: // -maix-struct-return - return false; - case CodeGenOptions::SRCK_InRegs: // -msvr4-struct-return - return true; - } - - if (Triple.isOSBinFormatELF() && !Triple.isOSLinux()) - return true; - - return false; -} - -bool -PPC32TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const { - return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ false, - /*IsAIX*/ false); -} - -// PowerPC-64 - -namespace { - -/// PPC64_SVR4_ABIInfo - The 64-bit PowerPC ELF (SVR4) ABI information. -class PPC64_SVR4_ABIInfo : public ABIInfo { - static const unsigned GPRBits = 64; - PPC64_SVR4_ABIKind Kind; - bool IsSoftFloatABI; - -public: - PPC64_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind, - bool SoftFloatABI) - : ABIInfo(CGT), Kind(Kind), IsSoftFloatABI(SoftFloatABI) {} - - bool isPromotableTypeForABI(QualType Ty) const; - CharUnits getParamTypeAlignment(QualType Ty) const; - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType Ty) const; - - bool isHomogeneousAggregateBaseType(QualType Ty) const override; - bool isHomogeneousAggregateSmallEnough(const Type *Ty, - uint64_t Members) const override; - - // TODO: We can add more logic to computeInfo to improve performance. - // Example: For aggregate arguments that fit in a register, we could - // use getDirectInReg (as is done below for structs containing a single - // floating-point value) to avoid pushing them to memory on function - // entry. This would require changing the logic in PPCISelLowering - // when lowering the parameters in the caller and args in the callee. - void computeInfo(CGFunctionInfo &FI) const override { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) { - // We rely on the default argument classification for the most part. - // One exception: An aggregate containing a single floating-point - // or vector item must be passed in a register if one is available. - const Type *T = isSingleElementStruct(I.type, getContext()); - if (T) { - const BuiltinType *BT = T->getAs(); - if ((T->isVectorType() && getContext().getTypeSize(T) == 128) || - (BT && BT->isFloatingPoint())) { - QualType QT(T, 0); - I.info = ABIArgInfo::getDirectInReg(CGT.ConvertType(QT)); - continue; - } - } - I.info = classifyArgumentType(I.type); - } - } - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -class PPC64_SVR4_TargetCodeGenInfo : public TargetCodeGenInfo { - -public: - PPC64_SVR4_TargetCodeGenInfo(CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind, - bool SoftFloatABI) - : TargetCodeGenInfo( - std::make_unique(CGT, Kind, SoftFloatABI)) { - SwiftInfo = - std::make_unique(CGT, /*SwiftErrorInRegister=*/false); - } - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - // This is recovered from gcc output. - return 1; // r1 is the dedicated stack pointer - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; -}; - -class PPC64TargetCodeGenInfo : public TargetCodeGenInfo { -public: - PPC64TargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - // This is recovered from gcc output. - return 1; // r1 is the dedicated stack pointer - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; -}; -} - -// Return true if the ABI requires Ty to be passed sign- or zero- -// extended to 64 bits. -bool -PPC64_SVR4_ABIInfo::isPromotableTypeForABI(QualType Ty) const { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // Promotable integer types are required to be promoted by the ABI. - if (isPromotableIntegerTypeForABI(Ty)) - return true; - - // In addition to the usual promotable integer types, we also need to - // extend all 32-bit types, since the ABI requires promotion to 64 bits. - if (const BuiltinType *BT = Ty->getAs()) - switch (BT->getKind()) { - case BuiltinType::Int: - case BuiltinType::UInt: - return true; - default: - break; - } - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() < 64) - return true; - - return false; -} - -/// isAlignedParamType - Determine whether a type requires 16-byte or -/// higher alignment in the parameter area. Always returns at least 8. -CharUnits PPC64_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const { - // Complex types are passed just like their elements. - if (const ComplexType *CTy = Ty->getAs()) - Ty = CTy->getElementType(); - - auto FloatUsesVector = [this](QualType Ty){ - return Ty->isRealFloatingType() && &getContext().getFloatTypeSemantics( - Ty) == &llvm::APFloat::IEEEquad(); - }; - - // Only vector types of size 16 bytes need alignment (larger types are - // passed via reference, smaller types are not aligned). - if (Ty->isVectorType()) { - return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16 : 8); - } else if (FloatUsesVector(Ty)) { - // According to ABI document section 'Optional Save Areas': If extended - // precision floating-point values in IEEE BINARY 128 QUADRUPLE PRECISION - // format are supported, map them to a single quadword, quadword aligned. - return CharUnits::fromQuantity(16); - } - - // For single-element float/vector structs, we consider the whole type - // to have the same alignment requirements as its single element. - const Type *AlignAsType = nullptr; - const Type *EltType = isSingleElementStruct(Ty, getContext()); - if (EltType) { - const BuiltinType *BT = EltType->getAs(); - if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) || - (BT && BT->isFloatingPoint())) - AlignAsType = EltType; - } - - // Likewise for ELFv2 homogeneous aggregates. - const Type *Base = nullptr; - uint64_t Members = 0; - if (!AlignAsType && Kind == PPC64_SVR4_ABIKind::ELFv2 && - isAggregateTypeForABI(Ty) && isHomogeneousAggregate(Ty, Base, Members)) - AlignAsType = Base; - - // With special case aggregates, only vector base types need alignment. - if (AlignAsType) { - bool UsesVector = AlignAsType->isVectorType() || - FloatUsesVector(QualType(AlignAsType, 0)); - return CharUnits::fromQuantity(UsesVector ? 16 : 8); - } - - // Otherwise, we only need alignment for any aggregate type that - // has an alignment requirement of >= 16 bytes. - if (isAggregateTypeForABI(Ty) && getContext().getTypeAlign(Ty) >= 128) { - return CharUnits::fromQuantity(16); - } - - return CharUnits::fromQuantity(8); -} - -/// isHomogeneousAggregate - Return true if a type is an ELFv2 homogeneous -/// aggregate. Base is set to the base element type, and Members is set -/// to the number of base elements. -bool ABIInfo::isHomogeneousAggregate(QualType Ty, const Type *&Base, - uint64_t &Members) const { - if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) { - uint64_t NElements = AT->getSize().getZExtValue(); - if (NElements == 0) - return false; - if (!isHomogeneousAggregate(AT->getElementType(), Base, Members)) - return false; - Members *= NElements; - } else if (const RecordType *RT = Ty->getAs()) { - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return false; - - Members = 0; - - // If this is a C++ record, check the properties of the record such as - // bases and ABI specific restrictions - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - if (!getCXXABI().isPermittedToBeHomogeneousAggregate(CXXRD)) - return false; - - for (const auto &I : CXXRD->bases()) { - // Ignore empty records. - if (isEmptyRecord(getContext(), I.getType(), true)) - continue; - - uint64_t FldMembers; - if (!isHomogeneousAggregate(I.getType(), Base, FldMembers)) - return false; - - Members += FldMembers; - } - } - - for (const auto *FD : RD->fields()) { - // Ignore (non-zero arrays of) empty records. - QualType FT = FD->getType(); - while (const ConstantArrayType *AT = - getContext().getAsConstantArrayType(FT)) { - if (AT->getSize().getZExtValue() == 0) - return false; - FT = AT->getElementType(); - } - if (isEmptyRecord(getContext(), FT, true)) - continue; - - if (isZeroLengthBitfieldPermittedInHomogeneousAggregate() && - FD->isZeroLengthBitField(getContext())) - continue; - - uint64_t FldMembers; - if (!isHomogeneousAggregate(FD->getType(), Base, FldMembers)) - return false; - - Members = (RD->isUnion() ? - std::max(Members, FldMembers) : Members + FldMembers); - } - - if (!Base) - return false; - - // Ensure there is no padding. - if (getContext().getTypeSize(Base) * Members != - getContext().getTypeSize(Ty)) - return false; - } else { - Members = 1; - if (const ComplexType *CT = Ty->getAs()) { - Members = 2; - Ty = CT->getElementType(); - } - - // Most ABIs only support float, double, and some vector type widths. - if (!isHomogeneousAggregateBaseType(Ty)) - return false; - - // The base type must be the same for all members. Types that - // agree in both total size and mode (float vs. vector) are - // treated as being equivalent here. - const Type *TyPtr = Ty.getTypePtr(); - if (!Base) { - Base = TyPtr; - // If it's a non-power-of-2 vector, its size is already a power-of-2, - // so make sure to widen it explicitly. - if (const VectorType *VT = Base->getAs()) { - QualType EltTy = VT->getElementType(); - unsigned NumElements = - getContext().getTypeSize(VT) / getContext().getTypeSize(EltTy); - Base = getContext() - .getVectorType(EltTy, NumElements, VT->getVectorKind()) - .getTypePtr(); - } - } - - if (Base->isVectorType() != TyPtr->isVectorType() || - getContext().getTypeSize(Base) != getContext().getTypeSize(TyPtr)) - return false; - } - return Members > 0 && isHomogeneousAggregateSmallEnough(Base, Members); -} - -bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { - // Homogeneous aggregates for ELFv2 must have base types of float, - // double, long double, or 128-bit vectors. - if (const BuiltinType *BT = Ty->getAs()) { - if (BT->getKind() == BuiltinType::Float || - BT->getKind() == BuiltinType::Double || - BT->getKind() == BuiltinType::LongDouble || - BT->getKind() == BuiltinType::Ibm128 || - (getContext().getTargetInfo().hasFloat128Type() && - (BT->getKind() == BuiltinType::Float128))) { - if (IsSoftFloatABI) - return false; - return true; - } - } - if (const VectorType *VT = Ty->getAs()) { - if (getContext().getTypeSize(VT) == 128) - return true; - } - return false; -} - -bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateSmallEnough( - const Type *Base, uint64_t Members) const { - // Vector and fp128 types require one register, other floating point types - // require one or two registers depending on their size. - uint32_t NumRegs = - ((getContext().getTargetInfo().hasFloat128Type() && - Base->isFloat128Type()) || - Base->isVectorType()) ? 1 - : (getContext().getTypeSize(Base) + 63) / 64; - - // Homogeneous Aggregates may occupy at most 8 registers. - return Members * NumRegs <= 8; -} - -ABIArgInfo -PPC64_SVR4_ABIInfo::classifyArgumentType(QualType Ty) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - if (Ty->isAnyComplexType()) - return ABIArgInfo::getDirect(); - - // Non-Altivec vector types are passed in GPRs (smaller than 16 bytes) - // or via reference (larger than 16 bytes). - if (Ty->isVectorType()) { - uint64_t Size = getContext().getTypeSize(Ty); - if (Size > 128) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - else if (Size < 128) { - llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size); - return ABIArgInfo::getDirect(CoerceTy); - } - } - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > 128) - return getNaturalAlignIndirect(Ty, /*ByVal=*/true); - - if (isAggregateTypeForABI(Ty)) { - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - uint64_t ABIAlign = getParamTypeAlignment(Ty).getQuantity(); - uint64_t TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity(); - - // ELFv2 homogeneous aggregates are passed as array types. - const Type *Base = nullptr; - uint64_t Members = 0; - if (Kind == PPC64_SVR4_ABIKind::ELFv2 && - isHomogeneousAggregate(Ty, Base, Members)) { - llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0)); - llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members); - return ABIArgInfo::getDirect(CoerceTy); - } - - // If an aggregate may end up fully in registers, we do not - // use the ByVal method, but pass the aggregate as array. - // This is usually beneficial since we avoid forcing the - // back-end to store the argument to memory. - uint64_t Bits = getContext().getTypeSize(Ty); - if (Bits > 0 && Bits <= 8 * GPRBits) { - llvm::Type *CoerceTy; - - // Types up to 8 bytes are passed as integer type (which will be - // properly aligned in the argument save area doubleword). - if (Bits <= GPRBits) - CoerceTy = - llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8)); - // Larger types are passed as arrays, with the base type selected - // according to the required alignment in the save area. - else { - uint64_t RegBits = ABIAlign * 8; - uint64_t NumRegs = llvm::alignTo(Bits, RegBits) / RegBits; - llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), RegBits); - CoerceTy = llvm::ArrayType::get(RegTy, NumRegs); - } - - return ABIArgInfo::getDirect(CoerceTy); - } - - // All other aggregates are passed ByVal. - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign), - /*ByVal=*/true, - /*Realign=*/TyAlign > ABIAlign); - } - - return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); -} - -ABIArgInfo -PPC64_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (RetTy->isAnyComplexType()) - return ABIArgInfo::getDirect(); - - // Non-Altivec vector types are returned in GPRs (smaller than 16 bytes) - // or via reference (larger than 16 bytes). - if (RetTy->isVectorType()) { - uint64_t Size = getContext().getTypeSize(RetTy); - if (Size > 128) - return getNaturalAlignIndirect(RetTy); - else if (Size < 128) { - llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size); - return ABIArgInfo::getDirect(CoerceTy); - } - } - - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > 128) - return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); - - if (isAggregateTypeForABI(RetTy)) { - // ELFv2 homogeneous aggregates are returned as array types. - const Type *Base = nullptr; - uint64_t Members = 0; - if (Kind == PPC64_SVR4_ABIKind::ELFv2 && - isHomogeneousAggregate(RetTy, Base, Members)) { - llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0)); - llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members); - return ABIArgInfo::getDirect(CoerceTy); - } - - // ELFv2 small aggregates are returned in up to two registers. - uint64_t Bits = getContext().getTypeSize(RetTy); - if (Kind == PPC64_SVR4_ABIKind::ELFv2 && Bits <= 2 * GPRBits) { - if (Bits == 0) - return ABIArgInfo::getIgnore(); - - llvm::Type *CoerceTy; - if (Bits > GPRBits) { - CoerceTy = llvm::IntegerType::get(getVMContext(), GPRBits); - CoerceTy = llvm::StructType::get(CoerceTy, CoerceTy); - } else - CoerceTy = - llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8)); - return ABIArgInfo::getDirect(CoerceTy); - } - - // All other aggregates are returned indirectly. - return getNaturalAlignIndirect(RetTy); - } - - return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -// Based on ARMABIInfo::EmitVAArg, adjusted for 64-bit machine. -Address PPC64_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - auto TypeInfo = getContext().getTypeInfoInChars(Ty); - TypeInfo.Align = getParamTypeAlignment(Ty); - - CharUnits SlotSize = CharUnits::fromQuantity(8); - - // If we have a complex type and the base type is smaller than 8 bytes, - // the ABI calls for the real and imaginary parts to be right-adjusted - // in separate doublewords. However, Clang expects us to produce a - // pointer to a structure with the two parts packed tightly. So generate - // loads of the real and imaginary parts relative to the va_list pointer, - // and store them to a temporary structure. - if (const ComplexType *CTy = Ty->getAs()) { - CharUnits EltSize = TypeInfo.Width / 2; - if (EltSize < SlotSize) - return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy); - } - - // Otherwise, just use the general rule. - // - // The PPC64 ABI passes some arguments in integer registers, even to variadic - // functions. To allow va_list to use the simple "void*" representation, - // variadic calls allocate space in the argument area for the integer argument - // registers, and variadic functions spill their integer argument registers to - // this area in their prologues. When aggregates smaller than a register are - // passed this way, they are passed in the least significant bits of the - // register, which means that after spilling on big-endian targets they will - // be right-aligned in their argument slot. This is uncommon; for a variety of - // reasons, other big-endian targets don't end up right-aligning aggregate - // types this way, and so right-alignment only applies to fundamental types. - // So on PPC64, we must force the use of right-alignment even for aggregates. - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo, - SlotSize, /*AllowHigher*/ true, - /*ForceRightAdjust*/ true); -} - -bool -PPC64_SVR4_TargetCodeGenInfo::initDwarfEHRegSizeTable( - CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const { - return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true, - /*IsAIX*/ false); -} - -bool -PPC64TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const { - return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true, - /*IsAIX*/ false); -} - -//===----------------------------------------------------------------------===// -// AArch64 ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class AArch64ABIInfo : public ABIInfo { - AArch64ABIKind Kind; - -public: - AArch64ABIInfo(CodeGenTypes &CGT, AArch64ABIKind Kind) - : ABIInfo(CGT), Kind(Kind) {} - -private: - AArch64ABIKind getABIKind() const { return Kind; } - bool isDarwinPCS() const { return Kind == AArch64ABIKind::DarwinPCS; } - - ABIArgInfo classifyReturnType(QualType RetTy, bool IsVariadic) const; - ABIArgInfo classifyArgumentType(QualType RetTy, bool IsVariadic, - unsigned CallingConvention) const; - ABIArgInfo coerceIllegalVector(QualType Ty) const; - bool isHomogeneousAggregateBaseType(QualType Ty) const override; - bool isHomogeneousAggregateSmallEnough(const Type *Ty, - uint64_t Members) const override; - bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override; - - bool isIllegalVectorType(QualType Ty) const; - - void computeInfo(CGFunctionInfo &FI) const override { - if (!::classifyReturnType(getCXXABI(), FI, *this)) - FI.getReturnInfo() = - classifyReturnType(FI.getReturnType(), FI.isVariadic()); - - for (auto &it : FI.arguments()) - it.info = classifyArgumentType(it.type, FI.isVariadic(), - FI.getCallingConvention()); - } - - Address EmitDarwinVAArg(Address VAListAddr, QualType Ty, - CodeGenFunction &CGF) const; - - Address EmitAAPCSVAArg(Address VAListAddr, QualType Ty, - CodeGenFunction &CGF) const; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override { - llvm::Type *BaseTy = CGF.ConvertType(Ty); - if (isa(BaseTy)) - llvm::report_fatal_error("Passing SVE types to variadic functions is " - "currently not supported"); - - return Kind == AArch64ABIKind::Win64 ? EmitMSVAArg(CGF, VAListAddr, Ty) - : isDarwinPCS() ? EmitDarwinVAArg(VAListAddr, Ty, CGF) - : EmitAAPCSVAArg(VAListAddr, Ty, CGF); - } - - Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - bool allowBFloatArgsAndRet() const override { - return getTarget().hasBFloat16Type(); - } -}; - -class AArch64SwiftABIInfo : public SwiftABIInfo { -public: - explicit AArch64SwiftABIInfo(CodeGenTypes &CGT) - : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {} - - bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, - unsigned NumElts) const override; -}; - -class AArch64TargetCodeGenInfo : public TargetCodeGenInfo { -public: - AArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind Kind) - : TargetCodeGenInfo(std::make_unique(CGT, Kind)) { - SwiftInfo = std::make_unique(CGT); - } - - StringRef getARCRetainAutoreleasedReturnValueMarker() const override { - return "mov\tfp, fp\t\t// marker for objc_retainAutoreleaseReturnValue"; - } - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - return 31; - } - - bool doesReturnSlotInterfereWithArgs() const override { return false; } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - const FunctionDecl *FD = dyn_cast_or_null(D); - if (!FD) - return; - - const auto *TA = FD->getAttr(); - if (TA == nullptr) - return; - - ParsedTargetAttr Attr = - CGM.getTarget().parseTargetAttr(TA->getFeaturesStr()); - if (Attr.BranchProtection.empty()) - return; - - TargetInfo::BranchProtectionInfo BPI; - StringRef Error; - (void)CGM.getTarget().validateBranchProtection(Attr.BranchProtection, - Attr.CPU, BPI, Error); - assert(Error.empty()); - - auto *Fn = cast(GV); - static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"}; - Fn->addFnAttr("sign-return-address", SignReturnAddrStr[static_cast(BPI.SignReturnAddr)]); - - if (BPI.SignReturnAddr != LangOptions::SignReturnAddressScopeKind::None) { - Fn->addFnAttr("sign-return-address-key", - BPI.SignKey == LangOptions::SignReturnAddressKeyKind::AKey - ? "a_key" - : "b_key"); - } - - Fn->addFnAttr("branch-target-enforcement", - BPI.BranchTargetEnforcement ? "true" : "false"); - } - - bool isScalarizableAsmOperand(CodeGen::CodeGenFunction &CGF, - llvm::Type *Ty) const override { - if (CGF.getTarget().hasFeature("ls64")) { - auto *ST = dyn_cast(Ty); - if (ST && ST->getNumElements() == 1) { - auto *AT = dyn_cast(ST->getElementType(0)); - if (AT && AT->getNumElements() == 8 && - AT->getElementType()->isIntegerTy(64)) - return true; - } - } - return TargetCodeGenInfo::isScalarizableAsmOperand(CGF, Ty); - } -}; - -class WindowsAArch64TargetCodeGenInfo : public AArch64TargetCodeGenInfo { -public: - WindowsAArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind K) - : AArch64TargetCodeGenInfo(CGT, K) {} - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override; - - void getDependentLibraryOption(llvm::StringRef Lib, - llvm::SmallString<24> &Opt) const override { - Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib); - } - - void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value, - llvm::SmallString<32> &Opt) const override { - Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; - } -}; - -void WindowsAArch64TargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { - AArch64TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); - if (GV->isDeclaration()) - return; - addStackProbeTargetAttributes(D, GV, CGM); -} -} - -ABIArgInfo AArch64ABIInfo::coerceIllegalVector(QualType Ty) const { - assert(Ty->isVectorType() && "expected vector type!"); - - const auto *VT = Ty->castAs(); - if (VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) { - assert(VT->getElementType()->isBuiltinType() && "expected builtin type!"); - assert(VT->getElementType()->castAs()->getKind() == - BuiltinType::UChar && - "unexpected builtin type for SVE predicate!"); - return ABIArgInfo::getDirect(llvm::ScalableVectorType::get( - llvm::Type::getInt1Ty(getVMContext()), 16)); - } - - if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector) { - assert(VT->getElementType()->isBuiltinType() && "expected builtin type!"); - - const auto *BT = VT->getElementType()->castAs(); - llvm::ScalableVectorType *ResType = nullptr; - switch (BT->getKind()) { - default: - llvm_unreachable("unexpected builtin type for SVE vector!"); - case BuiltinType::SChar: - case BuiltinType::UChar: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getInt8Ty(getVMContext()), 16); - break; - case BuiltinType::Short: - case BuiltinType::UShort: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getInt16Ty(getVMContext()), 8); - break; - case BuiltinType::Int: - case BuiltinType::UInt: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getInt32Ty(getVMContext()), 4); - break; - case BuiltinType::Long: - case BuiltinType::ULong: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getInt64Ty(getVMContext()), 2); - break; - case BuiltinType::Half: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getHalfTy(getVMContext()), 8); - break; - case BuiltinType::Float: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getFloatTy(getVMContext()), 4); - break; - case BuiltinType::Double: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getDoubleTy(getVMContext()), 2); - break; - case BuiltinType::BFloat16: - ResType = llvm::ScalableVectorType::get( - llvm::Type::getBFloatTy(getVMContext()), 8); - break; - } - return ABIArgInfo::getDirect(ResType); - } - - uint64_t Size = getContext().getTypeSize(Ty); - // Android promotes <2 x i8> to i16, not i32 - if ((isAndroid() || isOHOSFamily()) && (Size <= 16)) { - llvm::Type *ResType = llvm::Type::getInt16Ty(getVMContext()); - return ABIArgInfo::getDirect(ResType); - } - if (Size <= 32) { - llvm::Type *ResType = llvm::Type::getInt32Ty(getVMContext()); - return ABIArgInfo::getDirect(ResType); - } - if (Size == 64) { - auto *ResType = - llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 2); - return ABIArgInfo::getDirect(ResType); - } - if (Size == 128) { - auto *ResType = - llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 4); - return ABIArgInfo::getDirect(ResType); - } - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); -} - -ABIArgInfo -AArch64ABIInfo::classifyArgumentType(QualType Ty, bool IsVariadic, - unsigned CallingConvention) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - // Handle illegal vector types here. - if (isIllegalVectorType(Ty)) - return coerceIllegalVector(Ty); - - if (!isAggregateTypeForABI(Ty)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > 128) - return getNaturalAlignIndirect(Ty); - - return (isPromotableIntegerTypeForABI(Ty) && isDarwinPCS() - ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); - } - - // Structures with either a non-trivial destructor or a non-trivial - // copy constructor are always indirect. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { - return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == - CGCXXABI::RAA_DirectInMemory); - } - - // Empty records are always ignored on Darwin, but actually passed in C++ mode - // elsewhere for GNU compatibility. - uint64_t Size = getContext().getTypeSize(Ty); - bool IsEmpty = isEmptyRecord(getContext(), Ty, true); - if (IsEmpty || Size == 0) { - if (!getContext().getLangOpts().CPlusPlus || isDarwinPCS()) - return ABIArgInfo::getIgnore(); - - // GNU C mode. The only argument that gets ignored is an empty one with size - // 0. - if (IsEmpty && Size == 0) - return ABIArgInfo::getIgnore(); - return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); - } - - // Homogeneous Floating-point Aggregates (HFAs) need to be expanded. - const Type *Base = nullptr; - uint64_t Members = 0; - bool IsWin64 = Kind == AArch64ABIKind::Win64 || - CallingConvention == llvm::CallingConv::Win64; - bool IsWinVariadic = IsWin64 && IsVariadic; - // In variadic functions on Windows, all composite types are treated alike, - // no special handling of HFAs/HVAs. - if (!IsWinVariadic && isHomogeneousAggregate(Ty, Base, Members)) { - if (Kind != AArch64ABIKind::AAPCS) - return ABIArgInfo::getDirect( - llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members)); - - // For alignment adjusted HFAs, cap the argument alignment to 16, leave it - // default otherwise. - unsigned Align = - getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity(); - unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity(); - Align = (Align > BaseAlign && Align >= 16) ? 16 : 0; - return ABIArgInfo::getDirect( - llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members), 0, - nullptr, true, Align); - } - - // Aggregates <= 16 bytes are passed directly in registers or on the stack. - if (Size <= 128) { - // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of - // same size and alignment. - if (getTarget().isRenderScriptTarget()) { - return coerceToIntArray(Ty, getContext(), getVMContext()); - } - unsigned Alignment; - if (Kind == AArch64ABIKind::AAPCS) { - Alignment = getContext().getTypeUnadjustedAlign(Ty); - Alignment = Alignment < 128 ? 64 : 128; - } else { - Alignment = - std::max(getContext().getTypeAlign(Ty), - (unsigned)getTarget().getPointerWidth(LangAS::Default)); - } - Size = llvm::alignTo(Size, Alignment); - - // We use a pair of i64 for 16-byte aggregate with 8-byte alignment. - // For aggregates with 16-byte alignment, we use i128. - llvm::Type *BaseTy = llvm::Type::getIntNTy(getVMContext(), Alignment); - return ABIArgInfo::getDirect( - Size == Alignment ? BaseTy - : llvm::ArrayType::get(BaseTy, Size / Alignment)); - } - - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); -} - -ABIArgInfo AArch64ABIInfo::classifyReturnType(QualType RetTy, - bool IsVariadic) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (const auto *VT = RetTy->getAs()) { - if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector || - VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) - return coerceIllegalVector(RetTy); - } - - // Large vector types should be returned via memory. - if (RetTy->isVectorType() && getContext().getTypeSize(RetTy) > 128) - return getNaturalAlignIndirect(RetTy); - - if (!isAggregateTypeForABI(RetTy)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > 128) - return getNaturalAlignIndirect(RetTy); - - return (isPromotableIntegerTypeForABI(RetTy) && isDarwinPCS() - ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); - } - - uint64_t Size = getContext().getTypeSize(RetTy); - if (isEmptyRecord(getContext(), RetTy, true) || Size == 0) - return ABIArgInfo::getIgnore(); - - const Type *Base = nullptr; - uint64_t Members = 0; - if (isHomogeneousAggregate(RetTy, Base, Members) && - !(getTarget().getTriple().getArch() == llvm::Triple::aarch64_32 && - IsVariadic)) - // Homogeneous Floating-point Aggregates (HFAs) are returned directly. - return ABIArgInfo::getDirect(); - - // Aggregates <= 16 bytes are returned directly in registers or on the stack. - if (Size <= 128) { - // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of - // same size and alignment. - if (getTarget().isRenderScriptTarget()) { - return coerceToIntArray(RetTy, getContext(), getVMContext()); - } - - if (Size <= 64 && getDataLayout().isLittleEndian()) { - // Composite types are returned in lower bits of a 64-bit register for LE, - // and in higher bits for BE. However, integer types are always returned - // in lower bits for both LE and BE, and they are not rounded up to - // 64-bits. We can skip rounding up of composite types for LE, but not for - // BE, otherwise composite types will be indistinguishable from integer - // types. - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), Size)); - } - - unsigned Alignment = getContext().getTypeAlign(RetTy); - Size = llvm::alignTo(Size, 64); // round up to multiple of 8 bytes - - // We use a pair of i64 for 16-byte aggregate with 8-byte alignment. - // For aggregates with 16-byte alignment, we use i128. - if (Alignment < 128 && Size == 128) { - llvm::Type *BaseTy = llvm::Type::getInt64Ty(getVMContext()); - return ABIArgInfo::getDirect(llvm::ArrayType::get(BaseTy, Size / 64)); - } - return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Size)); - } - - return getNaturalAlignIndirect(RetTy); -} - -/// isIllegalVectorType - check whether the vector type is legal for AArch64. -bool AArch64ABIInfo::isIllegalVectorType(QualType Ty) const { - if (const VectorType *VT = Ty->getAs()) { - // Check whether VT is a fixed-length SVE vector. These types are - // represented as scalable vectors in function args/return and must be - // coerced from fixed vectors. - if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector || - VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) - return true; - - // Check whether VT is legal. - unsigned NumElements = VT->getNumElements(); - uint64_t Size = getContext().getTypeSize(VT); - // NumElements should be power of 2. - if (!llvm::isPowerOf2_32(NumElements)) - return true; - - // arm64_32 has to be compatible with the ARM logic here, which allows huge - // vectors for some reason. - llvm::Triple Triple = getTarget().getTriple(); - if (Triple.getArch() == llvm::Triple::aarch64_32 && - Triple.isOSBinFormatMachO()) - return Size <= 32; - - return Size != 64 && (Size != 128 || NumElements == 1); - } - return false; -} - -bool AArch64SwiftABIInfo::isLegalVectorType(CharUnits VectorSize, - llvm::Type *EltTy, - unsigned NumElts) const { - if (!llvm::isPowerOf2_32(NumElts)) - return false; - if (VectorSize.getQuantity() != 8 && - (VectorSize.getQuantity() != 16 || NumElts == 1)) - return false; - return true; -} - -bool AArch64ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { - // Homogeneous aggregates for AAPCS64 must have base types of a floating - // point type or a short-vector type. This is the same as the 32-bit ABI, - // but with the difference that any floating-point type is allowed, - // including __fp16. - if (const BuiltinType *BT = Ty->getAs()) { - if (BT->isFloatingPoint()) - return true; - } else if (const VectorType *VT = Ty->getAs()) { - unsigned VecSize = getContext().getTypeSize(VT); - if (VecSize == 64 || VecSize == 128) - return true; - } - return false; -} - -bool AArch64ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base, - uint64_t Members) const { - return Members <= 4; -} - -bool AArch64ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() - const { - // AAPCS64 says that the rule for whether something is a homogeneous - // aggregate is applied to the output of the data layout decision. So - // anything that doesn't affect the data layout also does not affect - // homogeneity. In particular, zero-length bitfields don't stop a struct - // being homogeneous. - return true; -} - -Address AArch64ABIInfo::EmitAAPCSVAArg(Address VAListAddr, QualType Ty, - CodeGenFunction &CGF) const { - ABIArgInfo AI = classifyArgumentType(Ty, /*IsVariadic=*/true, - CGF.CurFnInfo->getCallingConvention()); - // Empty records are ignored for parameter passing purposes. - if (AI.isIgnore()) { - uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8; - CharUnits SlotSize = CharUnits::fromQuantity(PointerSize); - VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy); - auto *Load = CGF.Builder.CreateLoad(VAListAddr); - Address Addr = Address(Load, CGF.Int8Ty, SlotSize); - return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); - } - - bool IsIndirect = AI.isIndirect(); - - llvm::Type *BaseTy = CGF.ConvertType(Ty); - if (IsIndirect) - BaseTy = llvm::PointerType::getUnqual(BaseTy); - else if (AI.getCoerceToType()) - BaseTy = AI.getCoerceToType(); - - unsigned NumRegs = 1; - if (llvm::ArrayType *ArrTy = dyn_cast(BaseTy)) { - BaseTy = ArrTy->getElementType(); - NumRegs = ArrTy->getNumElements(); - } - bool IsFPR = BaseTy->isFloatingPointTy() || BaseTy->isVectorTy(); - - // The AArch64 va_list type and handling is specified in the Procedure Call - // Standard, section B.4: - // - // struct { - // void *__stack; - // void *__gr_top; - // void *__vr_top; - // int __gr_offs; - // int __vr_offs; - // }; - - llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg"); - llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); - llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack"); - llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); - - CharUnits TySize = getContext().getTypeSizeInChars(Ty); - CharUnits TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty); - - Address reg_offs_p = Address::invalid(); - llvm::Value *reg_offs = nullptr; - int reg_top_index; - int RegSize = IsIndirect ? 8 : TySize.getQuantity(); - if (!IsFPR) { - // 3 is the field number of __gr_offs - reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 3, "gr_offs_p"); - reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "gr_offs"); - reg_top_index = 1; // field number for __gr_top - RegSize = llvm::alignTo(RegSize, 8); - } else { - // 4 is the field number of __vr_offs. - reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 4, "vr_offs_p"); - reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "vr_offs"); - reg_top_index = 2; // field number for __vr_top - RegSize = 16 * NumRegs; - } - - //======================================= - // Find out where argument was passed - //======================================= - - // If reg_offs >= 0 we're already using the stack for this type of - // argument. We don't want to keep updating reg_offs (in case it overflows, - // though anyone passing 2GB of arguments, each at most 16 bytes, deserves - // whatever they get). - llvm::Value *UsingStack = nullptr; - UsingStack = CGF.Builder.CreateICmpSGE( - reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, 0)); - - CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, MaybeRegBlock); - - // Otherwise, at least some kind of argument could go in these registers, the - // question is whether this particular type is too big. - CGF.EmitBlock(MaybeRegBlock); - - // Integer arguments may need to correct register alignment (for example a - // "struct { __int128 a; };" gets passed in x_2N, x_{2N+1}). In this case we - // align __gr_offs to calculate the potential address. - if (!IsFPR && !IsIndirect && TyAlign.getQuantity() > 8) { - int Align = TyAlign.getQuantity(); - - reg_offs = CGF.Builder.CreateAdd( - reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, Align - 1), - "align_regoffs"); - reg_offs = CGF.Builder.CreateAnd( - reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, -Align), - "aligned_regoffs"); - } - - // Update the gr_offs/vr_offs pointer for next call to va_arg on this va_list. - // The fact that this is done unconditionally reflects the fact that - // allocating an argument to the stack also uses up all the remaining - // registers of the appropriate kind. - llvm::Value *NewOffset = nullptr; - NewOffset = CGF.Builder.CreateAdd( - reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, RegSize), "new_reg_offs"); - CGF.Builder.CreateStore(NewOffset, reg_offs_p); - - // Now we're in a position to decide whether this argument really was in - // registers or not. - llvm::Value *InRegs = nullptr; - InRegs = CGF.Builder.CreateICmpSLE( - NewOffset, llvm::ConstantInt::get(CGF.Int32Ty, 0), "inreg"); - - CGF.Builder.CreateCondBr(InRegs, InRegBlock, OnStackBlock); - - //======================================= - // Argument was in registers - //======================================= - - // Now we emit the code for if the argument was originally passed in - // registers. First start the appropriate block: - CGF.EmitBlock(InRegBlock); - - llvm::Value *reg_top = nullptr; - Address reg_top_p = - CGF.Builder.CreateStructGEP(VAListAddr, reg_top_index, "reg_top_p"); - reg_top = CGF.Builder.CreateLoad(reg_top_p, "reg_top"); - Address BaseAddr(CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, reg_top, reg_offs), - CGF.Int8Ty, CharUnits::fromQuantity(IsFPR ? 16 : 8)); - Address RegAddr = Address::invalid(); - llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty), *ElementTy = MemTy; - - if (IsIndirect) { - // If it's been passed indirectly (actually a struct), whatever we find from - // stored registers or on the stack will actually be a struct **. - MemTy = llvm::PointerType::getUnqual(MemTy); - } - - const Type *Base = nullptr; - uint64_t NumMembers = 0; - bool IsHFA = isHomogeneousAggregate(Ty, Base, NumMembers); - if (IsHFA && NumMembers > 1) { - // Homogeneous aggregates passed in registers will have their elements split - // and stored 16-bytes apart regardless of size (they're notionally in qN, - // qN+1, ...). We reload and store into a temporary local variable - // contiguously. - assert(!IsIndirect && "Homogeneous aggregates should be passed directly"); - auto BaseTyInfo = getContext().getTypeInfoInChars(QualType(Base, 0)); - llvm::Type *BaseTy = CGF.ConvertType(QualType(Base, 0)); - llvm::Type *HFATy = llvm::ArrayType::get(BaseTy, NumMembers); - Address Tmp = CGF.CreateTempAlloca(HFATy, - std::max(TyAlign, BaseTyInfo.Align)); - - // On big-endian platforms, the value will be right-aligned in its slot. - int Offset = 0; - if (CGF.CGM.getDataLayout().isBigEndian() && - BaseTyInfo.Width.getQuantity() < 16) - Offset = 16 - BaseTyInfo.Width.getQuantity(); - - for (unsigned i = 0; i < NumMembers; ++i) { - CharUnits BaseOffset = CharUnits::fromQuantity(16 * i + Offset); - Address LoadAddr = - CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, BaseOffset); - LoadAddr = CGF.Builder.CreateElementBitCast(LoadAddr, BaseTy); - - Address StoreAddr = CGF.Builder.CreateConstArrayGEP(Tmp, i); - - llvm::Value *Elem = CGF.Builder.CreateLoad(LoadAddr); - CGF.Builder.CreateStore(Elem, StoreAddr); - } - - RegAddr = CGF.Builder.CreateElementBitCast(Tmp, MemTy); - } else { - // Otherwise the object is contiguous in memory. - - // It might be right-aligned in its slot. - CharUnits SlotSize = BaseAddr.getAlignment(); - if (CGF.CGM.getDataLayout().isBigEndian() && !IsIndirect && - (IsHFA || !isAggregateTypeForABI(Ty)) && - TySize < SlotSize) { - CharUnits Offset = SlotSize - TySize; - BaseAddr = CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, Offset); - } - - RegAddr = CGF.Builder.CreateElementBitCast(BaseAddr, MemTy); - } - - CGF.EmitBranch(ContBlock); - - //======================================= - // Argument was on the stack - //======================================= - CGF.EmitBlock(OnStackBlock); - - Address stack_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "stack_p"); - llvm::Value *OnStackPtr = CGF.Builder.CreateLoad(stack_p, "stack"); - - // Again, stack arguments may need realignment. In this case both integer and - // floating-point ones might be affected. - if (!IsIndirect && TyAlign.getQuantity() > 8) { - int Align = TyAlign.getQuantity(); - - OnStackPtr = CGF.Builder.CreatePtrToInt(OnStackPtr, CGF.Int64Ty); - - OnStackPtr = CGF.Builder.CreateAdd( - OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, Align - 1), - "align_stack"); - OnStackPtr = CGF.Builder.CreateAnd( - OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, -Align), - "align_stack"); - - OnStackPtr = CGF.Builder.CreateIntToPtr(OnStackPtr, CGF.Int8PtrTy); - } - Address OnStackAddr = Address(OnStackPtr, CGF.Int8Ty, - std::max(CharUnits::fromQuantity(8), TyAlign)); - - // All stack slots are multiples of 8 bytes. - CharUnits StackSlotSize = CharUnits::fromQuantity(8); - CharUnits StackSize; - if (IsIndirect) - StackSize = StackSlotSize; - else - StackSize = TySize.alignTo(StackSlotSize); - - llvm::Value *StackSizeC = CGF.Builder.getSize(StackSize); - llvm::Value *NewStack = CGF.Builder.CreateInBoundsGEP( - CGF.Int8Ty, OnStackPtr, StackSizeC, "new_stack"); - - // Write the new value of __stack for the next call to va_arg - CGF.Builder.CreateStore(NewStack, stack_p); - - if (CGF.CGM.getDataLayout().isBigEndian() && !isAggregateTypeForABI(Ty) && - TySize < StackSlotSize) { - CharUnits Offset = StackSlotSize - TySize; - OnStackAddr = CGF.Builder.CreateConstInBoundsByteGEP(OnStackAddr, Offset); - } - - OnStackAddr = CGF.Builder.CreateElementBitCast(OnStackAddr, MemTy); - - CGF.EmitBranch(ContBlock); - - //======================================= - // Tidy up - //======================================= - CGF.EmitBlock(ContBlock); - - Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, OnStackAddr, - OnStackBlock, "vaargs.addr"); - - if (IsIndirect) - return Address(CGF.Builder.CreateLoad(ResAddr, "vaarg.addr"), ElementTy, - TyAlign); - - return ResAddr; -} - -Address AArch64ABIInfo::EmitDarwinVAArg(Address VAListAddr, QualType Ty, - CodeGenFunction &CGF) const { - // The backend's lowering doesn't support va_arg for aggregates or - // illegal vector types. Lower VAArg here for these cases and use - // the LLVM va_arg instruction for everything else. - if (!isAggregateTypeForABI(Ty) && !isIllegalVectorType(Ty)) - return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect()); - - uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8; - CharUnits SlotSize = CharUnits::fromQuantity(PointerSize); - - // Empty records are ignored for parameter passing purposes. - if (isEmptyRecord(getContext(), Ty, true)) { - Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr, "ap.cur"), - getVAListElementType(CGF), SlotSize); - Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); - return Addr; - } - - // The size of the actual thing passed, which might end up just - // being a pointer for indirect types. - auto TyInfo = getContext().getTypeInfoInChars(Ty); - - // Arguments bigger than 16 bytes which aren't homogeneous - // aggregates should be passed indirectly. - bool IsIndirect = false; - if (TyInfo.Width.getQuantity() > 16) { - const Type *Base = nullptr; - uint64_t Members = 0; - IsIndirect = !isHomogeneousAggregate(Ty, Base, Members); - } - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, - TyInfo, SlotSize, /*AllowHigherAlign*/ true); -} - -Address AArch64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - bool IsIndirect = false; - - // Composites larger than 16 bytes are passed by reference. - if (isAggregateTypeForABI(Ty) && getContext().getTypeSize(Ty) > 128) - IsIndirect = true; - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, - CGF.getContext().getTypeInfoInChars(Ty), - CharUnits::fromQuantity(8), - /*allowHigherAlign*/ false); -} - -//===----------------------------------------------------------------------===// -// ARM ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class ARMABIInfo : public ABIInfo { - ARMABIKind Kind; - bool IsFloatABISoftFP; - -public: - ARMABIInfo(CodeGenTypes &CGT, ARMABIKind Kind) : ABIInfo(CGT), Kind(Kind) { - setCCs(); - IsFloatABISoftFP = CGT.getCodeGenOpts().FloatABI == "softfp" || - CGT.getCodeGenOpts().FloatABI == ""; // default - } - - bool isEABI() const { - switch (getTarget().getTriple().getEnvironment()) { - case llvm::Triple::Android: - case llvm::Triple::EABI: - case llvm::Triple::EABIHF: - case llvm::Triple::GNUEABI: - case llvm::Triple::GNUEABIHF: - case llvm::Triple::MuslEABI: - case llvm::Triple::MuslEABIHF: - return true; - default: - return getTarget().getTriple().isOHOSFamily(); - } - } - - bool isEABIHF() const { - switch (getTarget().getTriple().getEnvironment()) { - case llvm::Triple::EABIHF: - case llvm::Triple::GNUEABIHF: - case llvm::Triple::MuslEABIHF: - return true; - default: - return false; - } - } - - ARMABIKind getABIKind() const { return Kind; } - - bool allowBFloatArgsAndRet() const override { - return !IsFloatABISoftFP && getTarget().hasBFloat16Type(); - } - -private: - ABIArgInfo classifyReturnType(QualType RetTy, bool isVariadic, - unsigned functionCallConv) const; - ABIArgInfo classifyArgumentType(QualType RetTy, bool isVariadic, - unsigned functionCallConv) const; - ABIArgInfo classifyHomogeneousAggregate(QualType Ty, const Type *Base, - uint64_t Members) const; - ABIArgInfo coerceIllegalVector(QualType Ty) const; - bool isIllegalVectorType(QualType Ty) const; - bool containsAnyFP16Vectors(QualType Ty) const; - - bool isHomogeneousAggregateBaseType(QualType Ty) const override; - bool isHomogeneousAggregateSmallEnough(const Type *Ty, - uint64_t Members) const override; - bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override; - - bool isEffectivelyAAPCS_VFP(unsigned callConvention, bool acceptHalf) const; - - void computeInfo(CGFunctionInfo &FI) const override; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - llvm::CallingConv::ID getLLVMDefaultCC() const; - llvm::CallingConv::ID getABIDefaultCC() const; - void setCCs(); -}; - -class ARMSwiftABIInfo : public SwiftABIInfo { -public: - explicit ARMSwiftABIInfo(CodeGenTypes &CGT) - : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {} - - bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, - unsigned NumElts) const override; -}; - -class ARMTargetCodeGenInfo : public TargetCodeGenInfo { -public: - ARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K) - : TargetCodeGenInfo(std::make_unique(CGT, K)) { - SwiftInfo = std::make_unique(CGT); - } - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - return 13; - } - - StringRef getARCRetainAutoreleasedReturnValueMarker() const override { - return "mov\tr7, r7\t\t// marker for objc_retainAutoreleaseReturnValue"; - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4); - - // 0-15 are the 16 integer registers. - AssignToArrayRange(CGF.Builder, Address, Four8, 0, 15); - return false; - } - - unsigned getSizeOfUnwindException() const override { - if (getABIInfo().isEABI()) - return 88; - return TargetCodeGenInfo::getSizeOfUnwindException(); - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - if (GV->isDeclaration()) - return; - const FunctionDecl *FD = dyn_cast_or_null(D); - if (!FD) - return; - auto *Fn = cast(GV); - - if (const auto *TA = FD->getAttr()) { - ParsedTargetAttr Attr = - CGM.getTarget().parseTargetAttr(TA->getFeaturesStr()); - if (!Attr.BranchProtection.empty()) { - TargetInfo::BranchProtectionInfo BPI; - StringRef DiagMsg; - StringRef Arch = - Attr.CPU.empty() ? CGM.getTarget().getTargetOpts().CPU : Attr.CPU; - if (!CGM.getTarget().validateBranchProtection(Attr.BranchProtection, - Arch, BPI, DiagMsg)) { - CGM.getDiags().Report( - D->getLocation(), - diag::warn_target_unsupported_branch_protection_attribute) - << Arch; - } else { - static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"}; - assert(static_cast(BPI.SignReturnAddr) <= 2 && - "Unexpected SignReturnAddressScopeKind"); - Fn->addFnAttr( - "sign-return-address", - SignReturnAddrStr[static_cast(BPI.SignReturnAddr)]); - - Fn->addFnAttr("branch-target-enforcement", - BPI.BranchTargetEnforcement ? "true" : "false"); - } - } else if (CGM.getLangOpts().BranchTargetEnforcement || - CGM.getLangOpts().hasSignReturnAddress()) { - // If the Branch Protection attribute is missing, validate the target - // Architecture attribute against Branch Protection command line - // settings. - if (!CGM.getTarget().isBranchProtectionSupportedArch(Attr.CPU)) - CGM.getDiags().Report( - D->getLocation(), - diag::warn_target_unsupported_branch_protection_attribute) - << Attr.CPU; - } - } - - const ARMInterruptAttr *Attr = FD->getAttr(); - if (!Attr) - return; - - const char *Kind; - switch (Attr->getInterrupt()) { - case ARMInterruptAttr::Generic: Kind = ""; break; - case ARMInterruptAttr::IRQ: Kind = "IRQ"; break; - case ARMInterruptAttr::FIQ: Kind = "FIQ"; break; - case ARMInterruptAttr::SWI: Kind = "SWI"; break; - case ARMInterruptAttr::ABORT: Kind = "ABORT"; break; - case ARMInterruptAttr::UNDEF: Kind = "UNDEF"; break; - } - - Fn->addFnAttr("interrupt", Kind); - - ARMABIKind ABI = getABIInfo().getABIKind(); - if (ABI == ARMABIKind::APCS) - return; - - // AAPCS guarantees that sp will be 8-byte aligned on any public interface, - // however this is not necessarily true on taking any interrupt. Instruct - // the backend to perform a realignment as part of the function prologue. - llvm::AttrBuilder B(Fn->getContext()); - B.addStackAlignmentAttr(8); - Fn->addFnAttrs(B); - } -}; - -class WindowsARMTargetCodeGenInfo : public ARMTargetCodeGenInfo { -public: - WindowsARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K) - : ARMTargetCodeGenInfo(CGT, K) {} - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override; - - void getDependentLibraryOption(llvm::StringRef Lib, - llvm::SmallString<24> &Opt) const override { - Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib); - } - - void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value, - llvm::SmallString<32> &Opt) const override { - Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; - } -}; - -void WindowsARMTargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { - ARMTargetCodeGenInfo::setTargetAttributes(D, GV, CGM); - if (GV->isDeclaration()) - return; - addStackProbeTargetAttributes(D, GV, CGM); -} -} - -void ARMABIInfo::computeInfo(CGFunctionInfo &FI) const { - if (!::classifyReturnType(getCXXABI(), FI, *this)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), FI.isVariadic(), - FI.getCallingConvention()); - - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type, FI.isVariadic(), - FI.getCallingConvention()); - - - // Always honor user-specified calling convention. - if (FI.getCallingConvention() != llvm::CallingConv::C) - return; - - llvm::CallingConv::ID cc = getRuntimeCC(); - if (cc != llvm::CallingConv::C) - FI.setEffectiveCallingConvention(cc); -} - -/// Return the default calling convention that LLVM will use. -llvm::CallingConv::ID ARMABIInfo::getLLVMDefaultCC() const { - // The default calling convention that LLVM will infer. - if (isEABIHF() || getTarget().getTriple().isWatchABI()) - return llvm::CallingConv::ARM_AAPCS_VFP; - else if (isEABI()) - return llvm::CallingConv::ARM_AAPCS; - else - return llvm::CallingConv::ARM_APCS; -} - -/// Return the calling convention that our ABI would like us to use -/// as the C calling convention. -llvm::CallingConv::ID ARMABIInfo::getABIDefaultCC() const { - switch (getABIKind()) { - case ARMABIKind::APCS: - return llvm::CallingConv::ARM_APCS; - case ARMABIKind::AAPCS: - return llvm::CallingConv::ARM_AAPCS; - case ARMABIKind::AAPCS_VFP: - return llvm::CallingConv::ARM_AAPCS_VFP; - case ARMABIKind::AAPCS16_VFP: - return llvm::CallingConv::ARM_AAPCS_VFP; - } - llvm_unreachable("bad ABI kind"); -} - -void ARMABIInfo::setCCs() { - assert(getRuntimeCC() == llvm::CallingConv::C); - - // Don't muddy up the IR with a ton of explicit annotations if - // they'd just match what LLVM will infer from the triple. - llvm::CallingConv::ID abiCC = getABIDefaultCC(); - if (abiCC != getLLVMDefaultCC()) - RuntimeCC = abiCC; -} - -ABIArgInfo ARMABIInfo::coerceIllegalVector(QualType Ty) const { - uint64_t Size = getContext().getTypeSize(Ty); - if (Size <= 32) { - llvm::Type *ResType = - llvm::Type::getInt32Ty(getVMContext()); - return ABIArgInfo::getDirect(ResType); - } - if (Size == 64 || Size == 128) { - auto *ResType = llvm::FixedVectorType::get( - llvm::Type::getInt32Ty(getVMContext()), Size / 32); - return ABIArgInfo::getDirect(ResType); - } - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); -} - -ABIArgInfo ARMABIInfo::classifyHomogeneousAggregate(QualType Ty, - const Type *Base, - uint64_t Members) const { - assert(Base && "Base class should be set for homogeneous aggregate"); - // Base can be a floating-point or a vector. - if (const VectorType *VT = Base->getAs()) { - // FP16 vectors should be converted to integer vectors - if (!getTarget().hasLegalHalfType() && containsAnyFP16Vectors(Ty)) { - uint64_t Size = getContext().getTypeSize(VT); - auto *NewVecTy = llvm::FixedVectorType::get( - llvm::Type::getInt32Ty(getVMContext()), Size / 32); - llvm::Type *Ty = llvm::ArrayType::get(NewVecTy, Members); - return ABIArgInfo::getDirect(Ty, 0, nullptr, false); - } - } - unsigned Align = 0; - if (getABIKind() == ARMABIKind::AAPCS || - getABIKind() == ARMABIKind::AAPCS_VFP) { - // For alignment adjusted HFAs, cap the argument alignment to 8, leave it - // default otherwise. - Align = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity(); - unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity(); - Align = (Align > BaseAlign && Align >= 8) ? 8 : 0; - } - return ABIArgInfo::getDirect(nullptr, 0, nullptr, false, Align); -} - -ABIArgInfo ARMABIInfo::classifyArgumentType(QualType Ty, bool isVariadic, - unsigned functionCallConv) const { - // 6.1.2.1 The following argument types are VFP CPRCs: - // A single-precision floating-point type (including promoted - // half-precision types); A double-precision floating-point type; - // A 64-bit or 128-bit containerized vector type; Homogeneous Aggregate - // with a Base Type of a single- or double-precision floating-point type, - // 64-bit containerized vectors or 128-bit containerized vectors with one - // to four Elements. - // Variadic functions should always marshal to the base standard. - bool IsAAPCS_VFP = - !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv, /* AAPCS16 */ false); - - Ty = useFirstFieldIfTransparentUnion(Ty); - - // Handle illegal vector types here. - if (isIllegalVectorType(Ty)) - return coerceIllegalVector(Ty); - - if (!isAggregateTypeForABI(Ty)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) { - Ty = EnumTy->getDecl()->getIntegerType(); - } - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > 64) - return getNaturalAlignIndirect(Ty, /*ByVal=*/true); - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); - } - - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - } - - // Ignore empty records. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - if (IsAAPCS_VFP) { - // Homogeneous Aggregates need to be expanded when we can fit the aggregate - // into VFP registers. - const Type *Base = nullptr; - uint64_t Members = 0; - if (isHomogeneousAggregate(Ty, Base, Members)) - return classifyHomogeneousAggregate(Ty, Base, Members); - } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) { - // WatchOS does have homogeneous aggregates. Note that we intentionally use - // this convention even for a variadic function: the backend will use GPRs - // if needed. - const Type *Base = nullptr; - uint64_t Members = 0; - if (isHomogeneousAggregate(Ty, Base, Members)) { - assert(Base && Members <= 4 && "unexpected homogeneous aggregate"); - llvm::Type *Ty = - llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members); - return ABIArgInfo::getDirect(Ty, 0, nullptr, false); - } - } - - if (getABIKind() == ARMABIKind::AAPCS16_VFP && - getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(16)) { - // WatchOS is adopting the 64-bit AAPCS rule on composite types: if they're - // bigger than 128-bits, they get placed in space allocated by the caller, - // and a pointer is passed. - return ABIArgInfo::getIndirect( - CharUnits::fromQuantity(getContext().getTypeAlign(Ty) / 8), false); - } - - // Support byval for ARM. - // The ABI alignment for APCS is 4-byte and for AAPCS at least 4-byte and at - // most 8-byte. We realign the indirect argument if type alignment is bigger - // than ABI alignment. - uint64_t ABIAlign = 4; - uint64_t TyAlign; - if (getABIKind() == ARMABIKind::AAPCS_VFP || - getABIKind() == ARMABIKind::AAPCS) { - TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity(); - ABIAlign = std::clamp(TyAlign, (uint64_t)4, (uint64_t)8); - } else { - TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity(); - } - if (getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(64)) { - assert(getABIKind() != ARMABIKind::AAPCS16_VFP && "unexpected byval"); - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign), - /*ByVal=*/true, - /*Realign=*/TyAlign > ABIAlign); - } - - // On RenderScript, coerce Aggregates <= 64 bytes to an integer array of - // same size and alignment. - if (getTarget().isRenderScriptTarget()) { - return coerceToIntArray(Ty, getContext(), getVMContext()); - } - - // Otherwise, pass by coercing to a structure of the appropriate size. - llvm::Type* ElemTy; - unsigned SizeRegs; - // FIXME: Try to match the types of the arguments more accurately where - // we can. - if (TyAlign <= 4) { - ElemTy = llvm::Type::getInt32Ty(getVMContext()); - SizeRegs = (getContext().getTypeSize(Ty) + 31) / 32; - } else { - ElemTy = llvm::Type::getInt64Ty(getVMContext()); - SizeRegs = (getContext().getTypeSize(Ty) + 63) / 64; - } - - return ABIArgInfo::getDirect(llvm::ArrayType::get(ElemTy, SizeRegs)); -} - -static bool isIntegerLikeType(QualType Ty, ASTContext &Context, - llvm::LLVMContext &VMContext) { - // APCS, C Language Calling Conventions, Non-Simple Return Values: A structure - // is called integer-like if its size is less than or equal to one word, and - // the offset of each of its addressable sub-fields is zero. - - uint64_t Size = Context.getTypeSize(Ty); - - // Check that the type fits in a word. - if (Size > 32) - return false; - - // FIXME: Handle vector types! - if (Ty->isVectorType()) - return false; - - // Float types are never treated as "integer like". - if (Ty->isRealFloatingType()) - return false; - - // If this is a builtin or pointer type then it is ok. - if (Ty->getAs() || Ty->isPointerType()) - return true; - - // Small complex integer types are "integer like". - if (const ComplexType *CT = Ty->getAs()) - return isIntegerLikeType(CT->getElementType(), Context, VMContext); - - // Single element and zero sized arrays should be allowed, by the definition - // above, but they are not. - - // Otherwise, it must be a record type. - const RecordType *RT = Ty->getAs(); - if (!RT) return false; - - // Ignore records with flexible arrays. - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return false; - - // Check that all sub-fields are at offset 0, and are themselves "integer - // like". - const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); - - bool HadField = false; - unsigned idx = 0; - for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); - i != e; ++i, ++idx) { - const FieldDecl *FD = *i; - - // Bit-fields are not addressable, we only need to verify they are "integer - // like". We still have to disallow a subsequent non-bitfield, for example: - // struct { int : 0; int x } - // is non-integer like according to gcc. - if (FD->isBitField()) { - if (!RD->isUnion()) - HadField = true; - - if (!isIntegerLikeType(FD->getType(), Context, VMContext)) - return false; - - continue; - } - - // Check if this field is at offset 0. - if (Layout.getFieldOffset(idx) != 0) - return false; - - if (!isIntegerLikeType(FD->getType(), Context, VMContext)) - return false; - - // Only allow at most one field in a structure. This doesn't match the - // wording above, but follows gcc in situations with a field following an - // empty structure. - if (!RD->isUnion()) { - if (HadField) - return false; - - HadField = true; - } - } - - return true; -} - -ABIArgInfo ARMABIInfo::classifyReturnType(QualType RetTy, bool isVariadic, - unsigned functionCallConv) const { - - // Variadic functions should always marshal to the base standard. - bool IsAAPCS_VFP = - !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv, /* AAPCS16 */ true); - - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (const VectorType *VT = RetTy->getAs()) { - // Large vector types should be returned via memory. - if (getContext().getTypeSize(RetTy) > 128) - return getNaturalAlignIndirect(RetTy); - // TODO: FP16/BF16 vectors should be converted to integer vectors - // This check is similar to isIllegalVectorType - refactor? - if ((!getTarget().hasLegalHalfType() && - (VT->getElementType()->isFloat16Type() || - VT->getElementType()->isHalfType())) || - (IsFloatABISoftFP && - VT->getElementType()->isBFloat16Type())) - return coerceIllegalVector(RetTy); - } - - if (!isAggregateTypeForABI(RetTy)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > 64) - return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); - - return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect(); - } - - // Are we following APCS? - if (getABIKind() == ARMABIKind::APCS) { - if (isEmptyRecord(getContext(), RetTy, false)) - return ABIArgInfo::getIgnore(); - - // Complex types are all returned as packed integers. - // - // FIXME: Consider using 2 x vector types if the back end handles them - // correctly. - if (RetTy->isAnyComplexType()) - return ABIArgInfo::getDirect(llvm::IntegerType::get( - getVMContext(), getContext().getTypeSize(RetTy))); - - // Integer like structures are returned in r0. - if (isIntegerLikeType(RetTy, getContext(), getVMContext())) { - // Return in the smallest viable integer type. - uint64_t Size = getContext().getTypeSize(RetTy); - if (Size <= 8) - return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); - if (Size <= 16) - return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); - return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); - } - - // Otherwise return in memory. - return getNaturalAlignIndirect(RetTy); - } - - // Otherwise this is an AAPCS variant. - - if (isEmptyRecord(getContext(), RetTy, true)) - return ABIArgInfo::getIgnore(); - - // Check for homogeneous aggregates with AAPCS-VFP. - if (IsAAPCS_VFP) { - const Type *Base = nullptr; - uint64_t Members = 0; - if (isHomogeneousAggregate(RetTy, Base, Members)) - return classifyHomogeneousAggregate(RetTy, Base, Members); - } - - // Aggregates <= 4 bytes are returned in r0; other aggregates - // are returned indirectly. - uint64_t Size = getContext().getTypeSize(RetTy); - if (Size <= 32) { - // On RenderScript, coerce Aggregates <= 4 bytes to an integer array of - // same size and alignment. - if (getTarget().isRenderScriptTarget()) { - return coerceToIntArray(RetTy, getContext(), getVMContext()); - } - if (getDataLayout().isBigEndian()) - // Return in 32 bit integer integer type (as if loaded by LDR, AAPCS 5.4) - return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); - - // Return in the smallest viable integer type. - if (Size <= 8) - return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); - if (Size <= 16) - return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); - return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); - } else if (Size <= 128 && getABIKind() == ARMABIKind::AAPCS16_VFP) { - llvm::Type *Int32Ty = llvm::Type::getInt32Ty(getVMContext()); - llvm::Type *CoerceTy = - llvm::ArrayType::get(Int32Ty, llvm::alignTo(Size, 32) / 32); - return ABIArgInfo::getDirect(CoerceTy); - } - - return getNaturalAlignIndirect(RetTy); -} - -/// isIllegalVector - check whether Ty is an illegal vector type. -bool ARMABIInfo::isIllegalVectorType(QualType Ty) const { - if (const VectorType *VT = Ty->getAs ()) { - // On targets that don't support half, fp16 or bfloat, they are expanded - // into float, and we don't want the ABI to depend on whether or not they - // are supported in hardware. Thus return false to coerce vectors of these - // types into integer vectors. - // We do not depend on hasLegalHalfType for bfloat as it is a - // separate IR type. - if ((!getTarget().hasLegalHalfType() && - (VT->getElementType()->isFloat16Type() || - VT->getElementType()->isHalfType())) || - (IsFloatABISoftFP && - VT->getElementType()->isBFloat16Type())) - return true; - if (isAndroid()) { - // Android shipped using Clang 3.1, which supported a slightly different - // vector ABI. The primary differences were that 3-element vector types - // were legal, and so were sub 32-bit vectors (i.e. <2 x i8>). This path - // accepts that legacy behavior for Android only. - // Check whether VT is legal. - unsigned NumElements = VT->getNumElements(); - // NumElements should be power of 2 or equal to 3. - if (!llvm::isPowerOf2_32(NumElements) && NumElements != 3) - return true; - } else { - // Check whether VT is legal. - unsigned NumElements = VT->getNumElements(); - uint64_t Size = getContext().getTypeSize(VT); - // NumElements should be power of 2. - if (!llvm::isPowerOf2_32(NumElements)) - return true; - // Size should be greater than 32 bits. - return Size <= 32; - } - } - return false; -} - -/// Return true if a type contains any 16-bit floating point vectors -bool ARMABIInfo::containsAnyFP16Vectors(QualType Ty) const { - if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) { - uint64_t NElements = AT->getSize().getZExtValue(); - if (NElements == 0) - return false; - return containsAnyFP16Vectors(AT->getElementType()); - } else if (const RecordType *RT = Ty->getAs()) { - const RecordDecl *RD = RT->getDecl(); - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) - if (llvm::any_of(CXXRD->bases(), [this](const CXXBaseSpecifier &B) { - return containsAnyFP16Vectors(B.getType()); - })) - return true; - - if (llvm::any_of(RD->fields(), [this](FieldDecl *FD) { - return FD && containsAnyFP16Vectors(FD->getType()); - })) - return true; - - return false; - } else { - if (const VectorType *VT = Ty->getAs()) - return (VT->getElementType()->isFloat16Type() || - VT->getElementType()->isBFloat16Type() || - VT->getElementType()->isHalfType()); - return false; - } -} - -bool ARMSwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, - unsigned NumElts) const { - if (!llvm::isPowerOf2_32(NumElts)) - return false; - unsigned size = CGT.getDataLayout().getTypeStoreSizeInBits(EltTy); - if (size > 64) - return false; - if (VectorSize.getQuantity() != 8 && - (VectorSize.getQuantity() != 16 || NumElts == 1)) - return false; - return true; -} - -bool ARMABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { - // Homogeneous aggregates for AAPCS-VFP must have base types of float, - // double, or 64-bit or 128-bit vectors. - if (const BuiltinType *BT = Ty->getAs()) { - if (BT->getKind() == BuiltinType::Float || - BT->getKind() == BuiltinType::Double || - BT->getKind() == BuiltinType::LongDouble) - return true; - } else if (const VectorType *VT = Ty->getAs()) { - unsigned VecSize = getContext().getTypeSize(VT); - if (VecSize == 64 || VecSize == 128) - return true; - } - return false; -} - -bool ARMABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base, - uint64_t Members) const { - return Members <= 4; -} - -bool ARMABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const { - // AAPCS32 says that the rule for whether something is a homogeneous - // aggregate is applied to the output of the data layout decision. So - // anything that doesn't affect the data layout also does not affect - // homogeneity. In particular, zero-length bitfields don't stop a struct - // being homogeneous. - return true; -} - -bool ARMABIInfo::isEffectivelyAAPCS_VFP(unsigned callConvention, - bool acceptHalf) const { - // Give precedence to user-specified calling conventions. - if (callConvention != llvm::CallingConv::C) - return (callConvention == llvm::CallingConv::ARM_AAPCS_VFP); - else - return (getABIKind() == ARMABIKind::AAPCS_VFP) || - (acceptHalf && (getABIKind() == ARMABIKind::AAPCS16_VFP)); -} - -Address ARMABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - CharUnits SlotSize = CharUnits::fromQuantity(4); - - // Empty records are ignored for parameter passing purposes. - if (isEmptyRecord(getContext(), Ty, true)) { - VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy); - auto *Load = CGF.Builder.CreateLoad(VAListAddr); - Address Addr = Address(Load, CGF.Int8Ty, SlotSize); - return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); - } - - CharUnits TySize = getContext().getTypeSizeInChars(Ty); - CharUnits TyAlignForABI = getContext().getTypeUnadjustedAlignInChars(Ty); - - // Use indirect if size of the illegal vector is bigger than 16 bytes. - bool IsIndirect = false; - const Type *Base = nullptr; - uint64_t Members = 0; - if (TySize > CharUnits::fromQuantity(16) && isIllegalVectorType(Ty)) { - IsIndirect = true; - - // ARMv7k passes structs bigger than 16 bytes indirectly, in space - // allocated by the caller. - } else if (TySize > CharUnits::fromQuantity(16) && - getABIKind() == ARMABIKind::AAPCS16_VFP && - !isHomogeneousAggregate(Ty, Base, Members)) { - IsIndirect = true; - - // Otherwise, bound the type's ABI alignment. - // The ABI alignment for 64-bit or 128-bit vectors is 8 for AAPCS and 4 for - // APCS. For AAPCS, the ABI alignment is at least 4-byte and at most 8-byte. - // Our callers should be prepared to handle an under-aligned address. - } else if (getABIKind() == ARMABIKind::AAPCS_VFP || - getABIKind() == ARMABIKind::AAPCS) { - TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4)); - TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(8)); - } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) { - // ARMv7k allows type alignment up to 16 bytes. - TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4)); - TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(16)); - } else { - TyAlignForABI = CharUnits::fromQuantity(4); - } - - TypeInfoChars TyInfo(TySize, TyAlignForABI, AlignRequirementKind::None); - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TyInfo, - SlotSize, /*AllowHigherAlign*/ true); -} - -//===----------------------------------------------------------------------===// -// NVPTX ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class NVPTXTargetCodeGenInfo; - -class NVPTXABIInfo : public ABIInfo { - NVPTXTargetCodeGenInfo &CGInfo; - -public: - NVPTXABIInfo(CodeGenTypes &CGT, NVPTXTargetCodeGenInfo &Info) - : ABIInfo(CGT), CGInfo(Info) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType Ty) const; - - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - bool isUnsupportedType(QualType T) const; - ABIArgInfo coerceToIntArrayWithLimit(QualType Ty, unsigned MaxSize) const; -}; - -class NVPTXTargetCodeGenInfo : public TargetCodeGenInfo { -public: - NVPTXTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT, *this)) {} - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &M) const override; - bool shouldEmitStaticExternCAliases() const override; - - llvm::Type *getCUDADeviceBuiltinSurfaceDeviceType() const override { - // On the device side, surface reference is represented as an object handle - // in 64-bit integer. - return llvm::Type::getInt64Ty(getABIInfo().getVMContext()); - } - - llvm::Type *getCUDADeviceBuiltinTextureDeviceType() const override { - // On the device side, texture reference is represented as an object handle - // in 64-bit integer. - return llvm::Type::getInt64Ty(getABIInfo().getVMContext()); - } - - bool emitCUDADeviceBuiltinSurfaceDeviceCopy(CodeGenFunction &CGF, LValue Dst, - LValue Src) const override { - emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src); - return true; - } - - bool emitCUDADeviceBuiltinTextureDeviceCopy(CodeGenFunction &CGF, LValue Dst, - LValue Src) const override { - emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src); - return true; - } - -private: - // Adds a NamedMDNode with GV, Name, and Operand as operands, and adds the - // resulting MDNode to the nvvm.annotations MDNode. - static void addNVVMMetadata(llvm::GlobalValue *GV, StringRef Name, - int Operand); - - static void emitBuiltinSurfTexDeviceCopy(CodeGenFunction &CGF, LValue Dst, - LValue Src) { - llvm::Value *Handle = nullptr; - llvm::Constant *C = - llvm::dyn_cast(Src.getAddress(CGF).getPointer()); - // Lookup `addrspacecast` through the constant pointer if any. - if (auto *ASC = llvm::dyn_cast_or_null(C)) - C = llvm::cast(ASC->getPointerOperand()); - if (auto *GV = llvm::dyn_cast_or_null(C)) { - // Load the handle from the specific global variable using - // `nvvm.texsurf.handle.internal` intrinsic. - Handle = CGF.EmitRuntimeCall( - CGF.CGM.getIntrinsic(llvm::Intrinsic::nvvm_texsurf_handle_internal, - {GV->getType()}), - {GV}, "texsurf_handle"); - } else - Handle = CGF.EmitLoadOfScalar(Src, SourceLocation()); - CGF.EmitStoreOfScalar(Handle, Dst); - } -}; - -/// Checks if the type is unsupported directly by the current target. -bool NVPTXABIInfo::isUnsupportedType(QualType T) const { - ASTContext &Context = getContext(); - if (!Context.getTargetInfo().hasFloat16Type() && T->isFloat16Type()) - return true; - if (!Context.getTargetInfo().hasFloat128Type() && - (T->isFloat128Type() || - (T->isRealFloatingType() && Context.getTypeSize(T) == 128))) - return true; - if (const auto *EIT = T->getAs()) - return EIT->getNumBits() > - (Context.getTargetInfo().hasInt128Type() ? 128U : 64U); - if (!Context.getTargetInfo().hasInt128Type() && T->isIntegerType() && - Context.getTypeSize(T) > 64U) - return true; - if (const auto *AT = T->getAsArrayTypeUnsafe()) - return isUnsupportedType(AT->getElementType()); - const auto *RT = T->getAs(); - if (!RT) - return false; - const RecordDecl *RD = RT->getDecl(); - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) - for (const CXXBaseSpecifier &I : CXXRD->bases()) - if (isUnsupportedType(I.getType())) - return true; - - for (const FieldDecl *I : RD->fields()) - if (isUnsupportedType(I->getType())) - return true; - return false; -} - -/// Coerce the given type into an array with maximum allowed size of elements. -ABIArgInfo NVPTXABIInfo::coerceToIntArrayWithLimit(QualType Ty, - unsigned MaxSize) const { - // Alignment and Size are measured in bits. - const uint64_t Size = getContext().getTypeSize(Ty); - const uint64_t Alignment = getContext().getTypeAlign(Ty); - const unsigned Div = std::min(MaxSize, Alignment); - llvm::Type *IntType = llvm::Type::getIntNTy(getVMContext(), Div); - const uint64_t NumElements = (Size + Div - 1) / Div; - return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements)); -} - -ABIArgInfo NVPTXABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (getContext().getLangOpts().OpenMP && - getContext().getLangOpts().OpenMPIsDevice && isUnsupportedType(RetTy)) - return coerceToIntArrayWithLimit(RetTy, 64); - - // note: this is different from default ABI - if (!RetTy->isScalarType()) - return ABIArgInfo::getDirect(); - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -ABIArgInfo NVPTXABIInfo::classifyArgumentType(QualType Ty) const { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // Return aggregates type as indirect by value - if (isAggregateTypeForABI(Ty)) { - // Under CUDA device compilation, tex/surf builtin types are replaced with - // object types and passed directly. - if (getContext().getLangOpts().CUDAIsDevice) { - if (Ty->isCUDADeviceBuiltinSurfaceType()) - return ABIArgInfo::getDirect( - CGInfo.getCUDADeviceBuiltinSurfaceDeviceType()); - if (Ty->isCUDADeviceBuiltinTextureType()) - return ABIArgInfo::getDirect( - CGInfo.getCUDADeviceBuiltinTextureDeviceType()); - } - return getNaturalAlignIndirect(Ty, /* byval */ true); - } - - if (const auto *EIT = Ty->getAs()) { - if ((EIT->getNumBits() > 128) || - (!getContext().getTargetInfo().hasInt128Type() && - EIT->getNumBits() > 64)) - return getNaturalAlignIndirect(Ty, /* byval */ true); - } - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); -} - -void NVPTXABIInfo::computeInfo(CGFunctionInfo &FI) const { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); - - // Always honor user-specified calling convention. - if (FI.getCallingConvention() != llvm::CallingConv::C) - return; - - FI.setEffectiveCallingConvention(getRuntimeCC()); -} - -Address NVPTXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - llvm_unreachable("NVPTX does not support varargs"); -} - -void NVPTXTargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { - if (GV->isDeclaration()) - return; - const VarDecl *VD = dyn_cast_or_null(D); - if (VD) { - if (M.getLangOpts().CUDA) { - if (VD->getType()->isCUDADeviceBuiltinSurfaceType()) - addNVVMMetadata(GV, "surface", 1); - else if (VD->getType()->isCUDADeviceBuiltinTextureType()) - addNVVMMetadata(GV, "texture", 1); - return; - } - } - - const FunctionDecl *FD = dyn_cast_or_null(D); - if (!FD) return; - - llvm::Function *F = cast(GV); - - // Perform special handling in OpenCL mode - if (M.getLangOpts().OpenCL) { - // Use OpenCL function attributes to check for kernel functions - // By default, all functions are device functions - if (FD->hasAttr()) { - // OpenCL __kernel functions get kernel metadata - // Create !{, metadata !"kernel", i32 1} node - addNVVMMetadata(F, "kernel", 1); - // And kernel functions are not subject to inlining - F->addFnAttr(llvm::Attribute::NoInline); - } - } - - // Perform special handling in CUDA mode. - if (M.getLangOpts().CUDA) { - // CUDA __global__ functions get a kernel metadata entry. Since - // __global__ functions cannot be called from the device, we do not - // need to set the noinline attribute. - if (FD->hasAttr()) { - // Create !{, metadata !"kernel", i32 1} node - addNVVMMetadata(F, "kernel", 1); - } - if (CUDALaunchBoundsAttr *Attr = FD->getAttr()) { - // Create !{, metadata !"maxntidx", i32 } node - llvm::APSInt MaxThreads(32); - MaxThreads = Attr->getMaxThreads()->EvaluateKnownConstInt(M.getContext()); - if (MaxThreads > 0) - addNVVMMetadata(F, "maxntidx", MaxThreads.getExtValue()); - - // min blocks is an optional argument for CUDALaunchBoundsAttr. If it was - // not specified in __launch_bounds__ or if the user specified a 0 value, - // we don't have to add a PTX directive. - if (Attr->getMinBlocks()) { - llvm::APSInt MinBlocks(32); - MinBlocks = Attr->getMinBlocks()->EvaluateKnownConstInt(M.getContext()); - if (MinBlocks > 0) - // Create !{, metadata !"minctasm", i32 } node - addNVVMMetadata(F, "minctasm", MinBlocks.getExtValue()); - } - } - } - - // Attach kernel metadata directly if compiling for NVPTX. - if (FD->hasAttr()) { - addNVVMMetadata(F, "kernel", 1); - } -} - -void NVPTXTargetCodeGenInfo::addNVVMMetadata(llvm::GlobalValue *GV, - StringRef Name, int Operand) { - llvm::Module *M = GV->getParent(); - llvm::LLVMContext &Ctx = M->getContext(); - - // Get "nvvm.annotations" metadata node - llvm::NamedMDNode *MD = M->getOrInsertNamedMetadata("nvvm.annotations"); - - llvm::Metadata *MDVals[] = { - llvm::ConstantAsMetadata::get(GV), llvm::MDString::get(Ctx, Name), - llvm::ConstantAsMetadata::get( - llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), Operand))}; - // Append metadata to nvvm.annotations - MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); -} - -bool NVPTXTargetCodeGenInfo::shouldEmitStaticExternCAliases() const { - return false; -} -} - -//===----------------------------------------------------------------------===// -// SystemZ ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class SystemZABIInfo : public ABIInfo { - bool HasVector; - bool IsSoftFloatABI; - -public: - SystemZABIInfo(CodeGenTypes &CGT, bool HV, bool SF) - : ABIInfo(CGT), HasVector(HV), IsSoftFloatABI(SF) {} - - bool isPromotableIntegerTypeForABI(QualType Ty) const; - bool isCompoundType(QualType Ty) const; - bool isVectorArgumentType(QualType Ty) const; - bool isFPArgumentType(QualType Ty) const; - QualType GetSingleElementType(QualType Ty) const; - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType ArgTy) const; - - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -class SystemZTargetCodeGenInfo : public TargetCodeGenInfo { - ASTContext &Ctx; - - // These are used for speeding up the search for a visible vector ABI. - mutable bool HasVisibleVecABIFlag = false; - mutable std::set SeenTypes; - - // Returns true (the first time) if Ty is, or is found to include, a vector - // type that exposes the vector ABI. This is any vector >=16 bytes which - // with vector support are aligned to only 8 bytes. When IsParam is true, - // the type belongs to a value as passed between functions. If it is a - // vector <=16 bytes it will be passed in a vector register (if supported). - bool isVectorTypeBased(const Type *Ty, bool IsParam) const; - -public: - SystemZTargetCodeGenInfo(CodeGenTypes &CGT, bool HasVector, bool SoftFloatABI) - : TargetCodeGenInfo( - std::make_unique(CGT, HasVector, SoftFloatABI)), - Ctx(CGT.getContext()) { - SwiftInfo = - std::make_unique(CGT, /*SwiftErrorInRegister=*/false); - } - - // The vector ABI is different when the vector facility is present and when - // a module e.g. defines an externally visible vector variable, a flag - // indicating a visible vector ABI is added. Eventually this will result in - // a GNU attribute indicating the vector ABI of the module. Ty is the type - // of a variable or function parameter that is globally visible. - void handleExternallyVisibleObjABI(const Type *Ty, CodeGen::CodeGenModule &M, - bool IsParam) const { - if (!HasVisibleVecABIFlag && isVectorTypeBased(Ty, IsParam)) { - M.getModule().addModuleFlag(llvm::Module::Warning, - "s390x-visible-vector-ABI", 1); - HasVisibleVecABIFlag = true; - } - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &M) const override { - if (!D) - return; - - // Check if the vector ABI becomes visible by an externally visible - // variable or function. - if (const auto *VD = dyn_cast(D)) { - if (VD->isExternallyVisible()) - handleExternallyVisibleObjABI(VD->getType().getTypePtr(), M, - /*IsParam*/false); - } - else if (const FunctionDecl *FD = dyn_cast(D)) { - if (FD->isExternallyVisible()) - handleExternallyVisibleObjABI(FD->getType().getTypePtr(), M, - /*IsParam*/false); - } - } - - llvm::Value *testFPKind(llvm::Value *V, unsigned BuiltinID, - CGBuilderTy &Builder, - CodeGenModule &CGM) const override { - assert(V->getType()->isFloatingPointTy() && "V should have an FP type."); - // Only use TDC in constrained FP mode. - if (!Builder.getIsFPConstrained()) - return nullptr; - - llvm::Type *Ty = V->getType(); - if (Ty->isFloatTy() || Ty->isDoubleTy() || Ty->isFP128Ty()) { - llvm::Module &M = CGM.getModule(); - auto &Ctx = M.getContext(); - llvm::Function *TDCFunc = - llvm::Intrinsic::getDeclaration(&M, llvm::Intrinsic::s390_tdc, Ty); - unsigned TDCBits = 0; - switch (BuiltinID) { - case Builtin::BI__builtin_isnan: - TDCBits = 0xf; - break; - case Builtin::BIfinite: - case Builtin::BI__finite: - case Builtin::BIfinitef: - case Builtin::BI__finitef: - case Builtin::BIfinitel: - case Builtin::BI__finitel: - case Builtin::BI__builtin_isfinite: - TDCBits = 0xfc0; - break; - case Builtin::BI__builtin_isinf: - TDCBits = 0x30; - break; - default: - break; - } - if (TDCBits) - return Builder.CreateCall( - TDCFunc, - {V, llvm::ConstantInt::get(llvm::Type::getInt64Ty(Ctx), TDCBits)}); - } - return nullptr; - } -}; -} - -bool SystemZABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // Promotable integer types are required to be promoted by the ABI. - if (ABIInfo::isPromotableIntegerTypeForABI(Ty)) - return true; - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() < 64) - return true; - - // 32-bit values must also be promoted. - if (const BuiltinType *BT = Ty->getAs()) - switch (BT->getKind()) { - case BuiltinType::Int: - case BuiltinType::UInt: - return true; - default: - return false; - } - return false; -} - -bool SystemZABIInfo::isCompoundType(QualType Ty) const { - return (Ty->isAnyComplexType() || - Ty->isVectorType() || - isAggregateTypeForABI(Ty)); -} - -bool SystemZABIInfo::isVectorArgumentType(QualType Ty) const { - return (HasVector && - Ty->isVectorType() && - getContext().getTypeSize(Ty) <= 128); -} - -bool SystemZABIInfo::isFPArgumentType(QualType Ty) const { - if (IsSoftFloatABI) - return false; - - if (const BuiltinType *BT = Ty->getAs()) - switch (BT->getKind()) { - case BuiltinType::Float: - case BuiltinType::Double: - return true; - default: - return false; - } - - return false; -} - -QualType SystemZABIInfo::GetSingleElementType(QualType Ty) const { - const RecordType *RT = Ty->getAs(); - - if (RT && RT->isStructureOrClassType()) { - const RecordDecl *RD = RT->getDecl(); - QualType Found; - - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) - if (CXXRD->hasDefinition()) - for (const auto &I : CXXRD->bases()) { - QualType Base = I.getType(); - - // Empty bases don't affect things either way. - if (isEmptyRecord(getContext(), Base, true)) - continue; - - if (!Found.isNull()) - return Ty; - Found = GetSingleElementType(Base); - } - - // Check the fields. - for (const auto *FD : RD->fields()) { - // Unlike isSingleElementStruct(), empty structure and array fields - // do count. So do anonymous bitfields that aren't zero-sized. - - // Like isSingleElementStruct(), ignore C++20 empty data members. - if (FD->hasAttr() && - isEmptyRecord(getContext(), FD->getType(), true)) - continue; - - // Unlike isSingleElementStruct(), arrays do not count. - // Nested structures still do though. - if (!Found.isNull()) - return Ty; - Found = GetSingleElementType(FD->getType()); - } - - // Unlike isSingleElementStruct(), trailing padding is allowed. - // An 8-byte aligned struct s { float f; } is passed as a double. - if (!Found.isNull()) - return Found; - } - - return Ty; -} - -Address SystemZABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - // Assume that va_list type is correct; should be pointer to LLVM type: - // struct { - // i64 __gpr; - // i64 __fpr; - // i8 *__overflow_arg_area; - // i8 *__reg_save_area; - // }; - - // Every non-vector argument occupies 8 bytes and is passed by preference - // in either GPRs or FPRs. Vector arguments occupy 8 or 16 bytes and are - // always passed on the stack. - const SystemZTargetCodeGenInfo &SZCGI = - static_cast( - CGT.getCGM().getTargetCodeGenInfo()); - Ty = getContext().getCanonicalType(Ty); - auto TyInfo = getContext().getTypeInfoInChars(Ty); - llvm::Type *ArgTy = CGF.ConvertTypeForMem(Ty); - llvm::Type *DirectTy = ArgTy; - ABIArgInfo AI = classifyArgumentType(Ty); - bool IsIndirect = AI.isIndirect(); - bool InFPRs = false; - bool IsVector = false; - CharUnits UnpaddedSize; - CharUnits DirectAlign; - SZCGI.handleExternallyVisibleObjABI(Ty.getTypePtr(), CGT.getCGM(), - /*IsParam*/true); - if (IsIndirect) { - DirectTy = llvm::PointerType::getUnqual(DirectTy); - UnpaddedSize = DirectAlign = CharUnits::fromQuantity(8); - } else { - if (AI.getCoerceToType()) - ArgTy = AI.getCoerceToType(); - InFPRs = (!IsSoftFloatABI && (ArgTy->isFloatTy() || ArgTy->isDoubleTy())); - IsVector = ArgTy->isVectorTy(); - UnpaddedSize = TyInfo.Width; - DirectAlign = TyInfo.Align; - } - CharUnits PaddedSize = CharUnits::fromQuantity(8); - if (IsVector && UnpaddedSize > PaddedSize) - PaddedSize = CharUnits::fromQuantity(16); - assert((UnpaddedSize <= PaddedSize) && "Invalid argument size."); - - CharUnits Padding = (PaddedSize - UnpaddedSize); - - llvm::Type *IndexTy = CGF.Int64Ty; - llvm::Value *PaddedSizeV = - llvm::ConstantInt::get(IndexTy, PaddedSize.getQuantity()); - - if (IsVector) { - // Work out the address of a vector argument on the stack. - // Vector arguments are always passed in the high bits of a - // single (8 byte) or double (16 byte) stack slot. - Address OverflowArgAreaPtr = - CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr"); - Address OverflowArgArea = - Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"), - CGF.Int8Ty, TyInfo.Align); - Address MemAddr = - CGF.Builder.CreateElementBitCast(OverflowArgArea, DirectTy, "mem_addr"); - - // Update overflow_arg_area_ptr pointer - llvm::Value *NewOverflowArgArea = CGF.Builder.CreateGEP( - OverflowArgArea.getElementType(), OverflowArgArea.getPointer(), - PaddedSizeV, "overflow_arg_area"); - CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr); - - return MemAddr; - } - - assert(PaddedSize.getQuantity() == 8); - - unsigned MaxRegs, RegCountField, RegSaveIndex; - CharUnits RegPadding; - if (InFPRs) { - MaxRegs = 4; // Maximum of 4 FPR arguments - RegCountField = 1; // __fpr - RegSaveIndex = 16; // save offset for f0 - RegPadding = CharUnits(); // floats are passed in the high bits of an FPR - } else { - MaxRegs = 5; // Maximum of 5 GPR arguments - RegCountField = 0; // __gpr - RegSaveIndex = 2; // save offset for r2 - RegPadding = Padding; // values are passed in the low bits of a GPR - } - - Address RegCountPtr = - CGF.Builder.CreateStructGEP(VAListAddr, RegCountField, "reg_count_ptr"); - llvm::Value *RegCount = CGF.Builder.CreateLoad(RegCountPtr, "reg_count"); - llvm::Value *MaxRegsV = llvm::ConstantInt::get(IndexTy, MaxRegs); - llvm::Value *InRegs = CGF.Builder.CreateICmpULT(RegCount, MaxRegsV, - "fits_in_regs"); - - llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); - llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem"); - llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); - CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock); - - // Emit code to load the value if it was passed in registers. - CGF.EmitBlock(InRegBlock); - - // Work out the address of an argument register. - llvm::Value *ScaledRegCount = - CGF.Builder.CreateMul(RegCount, PaddedSizeV, "scaled_reg_count"); - llvm::Value *RegBase = - llvm::ConstantInt::get(IndexTy, RegSaveIndex * PaddedSize.getQuantity() - + RegPadding.getQuantity()); - llvm::Value *RegOffset = - CGF.Builder.CreateAdd(ScaledRegCount, RegBase, "reg_offset"); - Address RegSaveAreaPtr = - CGF.Builder.CreateStructGEP(VAListAddr, 3, "reg_save_area_ptr"); - llvm::Value *RegSaveArea = - CGF.Builder.CreateLoad(RegSaveAreaPtr, "reg_save_area"); - Address RawRegAddr( - CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, RegOffset, "raw_reg_addr"), - CGF.Int8Ty, PaddedSize); - Address RegAddr = - CGF.Builder.CreateElementBitCast(RawRegAddr, DirectTy, "reg_addr"); - - // Update the register count - llvm::Value *One = llvm::ConstantInt::get(IndexTy, 1); - llvm::Value *NewRegCount = - CGF.Builder.CreateAdd(RegCount, One, "reg_count"); - CGF.Builder.CreateStore(NewRegCount, RegCountPtr); - CGF.EmitBranch(ContBlock); - - // Emit code to load the value if it was passed in memory. - CGF.EmitBlock(InMemBlock); - - // Work out the address of a stack argument. - Address OverflowArgAreaPtr = - CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr"); - Address OverflowArgArea = - Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"), - CGF.Int8Ty, PaddedSize); - Address RawMemAddr = - CGF.Builder.CreateConstByteGEP(OverflowArgArea, Padding, "raw_mem_addr"); - Address MemAddr = - CGF.Builder.CreateElementBitCast(RawMemAddr, DirectTy, "mem_addr"); - - // Update overflow_arg_area_ptr pointer - llvm::Value *NewOverflowArgArea = - CGF.Builder.CreateGEP(OverflowArgArea.getElementType(), - OverflowArgArea.getPointer(), PaddedSizeV, - "overflow_arg_area"); - CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr); - CGF.EmitBranch(ContBlock); - - // Return the appropriate result. - CGF.EmitBlock(ContBlock); - Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock, - "va_arg.addr"); - - if (IsIndirect) - ResAddr = Address(CGF.Builder.CreateLoad(ResAddr, "indirect_arg"), ArgTy, - TyInfo.Align); - - return ResAddr; -} - -ABIArgInfo SystemZABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - if (isVectorArgumentType(RetTy)) - return ABIArgInfo::getDirect(); - if (isCompoundType(RetTy) || getContext().getTypeSize(RetTy) > 64) - return getNaturalAlignIndirect(RetTy); - return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect()); -} - -ABIArgInfo SystemZABIInfo::classifyArgumentType(QualType Ty) const { - // Handle the generic C++ ABI. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - // Integers and enums are extended to full register width. - if (isPromotableIntegerTypeForABI(Ty)) - return ABIArgInfo::getExtend(Ty); - - // Handle vector types and vector-like structure types. Note that - // as opposed to float-like structure types, we do not allow any - // padding for vector-like structures, so verify the sizes match. - uint64_t Size = getContext().getTypeSize(Ty); - QualType SingleElementTy = GetSingleElementType(Ty); - if (isVectorArgumentType(SingleElementTy) && - getContext().getTypeSize(SingleElementTy) == Size) - return ABIArgInfo::getDirect(CGT.ConvertType(SingleElementTy)); - - // Values that are not 1, 2, 4 or 8 bytes in size are passed indirectly. - if (Size != 8 && Size != 16 && Size != 32 && Size != 64) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - - // Handle small structures. - if (const RecordType *RT = Ty->getAs()) { - // Structures with flexible arrays have variable length, so really - // fail the size test above. - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - - // The structure is passed as an unextended integer, a float, or a double. - llvm::Type *PassTy; - if (isFPArgumentType(SingleElementTy)) { - assert(Size == 32 || Size == 64); - if (Size == 32) - PassTy = llvm::Type::getFloatTy(getVMContext()); - else - PassTy = llvm::Type::getDoubleTy(getVMContext()); - } else - PassTy = llvm::IntegerType::get(getVMContext(), Size); - return ABIArgInfo::getDirect(PassTy); - } - - // Non-structure compounds are passed indirectly. - if (isCompoundType(Ty)) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - - return ABIArgInfo::getDirect(nullptr); -} - -void SystemZABIInfo::computeInfo(CGFunctionInfo &FI) const { - const SystemZTargetCodeGenInfo &SZCGI = - static_cast( - CGT.getCGM().getTargetCodeGenInfo()); - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - unsigned Idx = 0; - for (auto &I : FI.arguments()) { - I.info = classifyArgumentType(I.type); - if (FI.isVariadic() && Idx++ >= FI.getNumRequiredArgs()) - // Check if a vararg vector argument is passed, in which case the - // vector ABI becomes visible as the va_list could be passed on to - // other functions. - SZCGI.handleExternallyVisibleObjABI(I.type.getTypePtr(), CGT.getCGM(), - /*IsParam*/true); - } -} - -bool SystemZTargetCodeGenInfo::isVectorTypeBased(const Type *Ty, - bool IsParam) const { - if (!SeenTypes.insert(Ty).second) - return false; - - if (IsParam) { - // A narrow (<16 bytes) vector will as a parameter also expose the ABI as - // it will be passed in a vector register. A wide (>16 bytes) vector will - // be passed via "hidden" pointer where any extra alignment is not - // required (per GCC). - const Type *SingleEltTy = getABIInfo() - .GetSingleElementType(QualType(Ty, 0)) - .getTypePtr(); - bool SingleVecEltStruct = SingleEltTy != Ty && SingleEltTy->isVectorType() && - Ctx.getTypeSize(SingleEltTy) == Ctx.getTypeSize(Ty); - if (Ty->isVectorType() || SingleVecEltStruct) - return Ctx.getTypeSize(Ty) / 8 <= 16; - } - - // Assume pointers are dereferenced. - while (Ty->isPointerType() || Ty->isArrayType()) - Ty = Ty->getPointeeOrArrayElementType(); - - // Vectors >= 16 bytes expose the ABI through alignment requirements. - if (Ty->isVectorType() && Ctx.getTypeSize(Ty) / 8 >= 16) - return true; - - if (const auto *RecordTy = Ty->getAs()) { - const RecordDecl *RD = RecordTy->getDecl(); - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) - if (CXXRD->hasDefinition()) - for (const auto &I : CXXRD->bases()) - if (isVectorTypeBased(I.getType().getTypePtr(), /*IsParam*/false)) - return true; - for (const auto *FD : RD->fields()) - if (isVectorTypeBased(FD->getType().getTypePtr(), /*IsParam*/false)) - return true; - } - - if (const auto *FT = Ty->getAs()) - if (isVectorTypeBased(FT->getReturnType().getTypePtr(), /*IsParam*/true)) - return true; - if (const FunctionProtoType *Proto = Ty->getAs()) - for (const auto &ParamType : Proto->getParamTypes()) - if (isVectorTypeBased(ParamType.getTypePtr(), /*IsParam*/true)) - return true; - - return false; -} - -//===----------------------------------------------------------------------===// -// MSP430 ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class MSP430ABIInfo : public DefaultABIInfo { - static ABIArgInfo complexArgInfo() { - ABIArgInfo Info = ABIArgInfo::getDirect(); - Info.setCanBeFlattened(false); - return Info; - } - -public: - MSP430ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const { - if (RetTy->isAnyComplexType()) - return complexArgInfo(); - - return DefaultABIInfo::classifyReturnType(RetTy); - } - - ABIArgInfo classifyArgumentType(QualType RetTy) const { - if (RetTy->isAnyComplexType()) - return complexArgInfo(); - - return DefaultABIInfo::classifyArgumentType(RetTy); - } - - // Just copy the original implementations because - // DefaultABIInfo::classify{Return,Argument}Type() are not virtual - void computeInfo(CGFunctionInfo &FI) const override { - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); - } - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override { - return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty)); - } -}; - -class MSP430TargetCodeGenInfo : public TargetCodeGenInfo { -public: - MSP430TargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &M) const override; -}; - -} - -void MSP430TargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { - if (GV->isDeclaration()) - return; - if (const FunctionDecl *FD = dyn_cast_or_null(D)) { - const auto *InterruptAttr = FD->getAttr(); - if (!InterruptAttr) - return; - - // Handle 'interrupt' attribute: - llvm::Function *F = cast(GV); - - // Step 1: Set ISR calling convention. - F->setCallingConv(llvm::CallingConv::MSP430_INTR); - - // Step 2: Add attributes goodness. - F->addFnAttr(llvm::Attribute::NoInline); - F->addFnAttr("interrupt", llvm::utostr(InterruptAttr->getNumber())); - } -} - -//===----------------------------------------------------------------------===// -// MIPS ABI Implementation. This works for both little-endian and -// big-endian variants. -//===----------------------------------------------------------------------===// - -namespace { -class MipsABIInfo : public ABIInfo { - bool IsO32; - const unsigned MinABIStackAlignInBytes, StackAlignInBytes; - void CoerceToIntArgs(uint64_t TySize, - SmallVectorImpl &ArgList) const; - llvm::Type* HandleAggregates(QualType Ty, uint64_t TySize) const; - llvm::Type* returnAggregateInRegs(QualType RetTy, uint64_t Size) const; - llvm::Type* getPaddingType(uint64_t Align, uint64_t Offset) const; -public: - MipsABIInfo(CodeGenTypes &CGT, bool _IsO32) : - ABIInfo(CGT), IsO32(_IsO32), MinABIStackAlignInBytes(IsO32 ? 4 : 8), - StackAlignInBytes(IsO32 ? 8 : 16) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType RetTy, uint64_t &Offset) const; - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - ABIArgInfo extendType(QualType Ty) const; -}; - -class MIPSTargetCodeGenInfo : public TargetCodeGenInfo { - unsigned SizeOfUnwindException; -public: - MIPSTargetCodeGenInfo(CodeGenTypes &CGT, bool IsO32) - : TargetCodeGenInfo(std::make_unique(CGT, IsO32)), - SizeOfUnwindException(IsO32 ? 24 : 32) {} - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { - return 29; - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - const FunctionDecl *FD = dyn_cast_or_null(D); - if (!FD) return; - llvm::Function *Fn = cast(GV); - - if (FD->hasAttr()) - Fn->addFnAttr("long-call"); - else if (FD->hasAttr()) - Fn->addFnAttr("short-call"); - - // Other attributes do not have a meaning for declarations. - if (GV->isDeclaration()) - return; - - if (FD->hasAttr()) { - Fn->addFnAttr("mips16"); - } - else if (FD->hasAttr()) { - Fn->addFnAttr("nomips16"); - } - - if (FD->hasAttr()) - Fn->addFnAttr("micromips"); - else if (FD->hasAttr()) - Fn->addFnAttr("nomicromips"); - - const MipsInterruptAttr *Attr = FD->getAttr(); - if (!Attr) - return; - - const char *Kind; - switch (Attr->getInterrupt()) { - case MipsInterruptAttr::eic: Kind = "eic"; break; - case MipsInterruptAttr::sw0: Kind = "sw0"; break; - case MipsInterruptAttr::sw1: Kind = "sw1"; break; - case MipsInterruptAttr::hw0: Kind = "hw0"; break; - case MipsInterruptAttr::hw1: Kind = "hw1"; break; - case MipsInterruptAttr::hw2: Kind = "hw2"; break; - case MipsInterruptAttr::hw3: Kind = "hw3"; break; - case MipsInterruptAttr::hw4: Kind = "hw4"; break; - case MipsInterruptAttr::hw5: Kind = "hw5"; break; - } - - Fn->addFnAttr("interrupt", Kind); - - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; - - unsigned getSizeOfUnwindException() const override { - return SizeOfUnwindException; - } -}; -} - -void MipsABIInfo::CoerceToIntArgs( - uint64_t TySize, SmallVectorImpl &ArgList) const { - llvm::IntegerType *IntTy = - llvm::IntegerType::get(getVMContext(), MinABIStackAlignInBytes * 8); - - // Add (TySize / MinABIStackAlignInBytes) args of IntTy. - for (unsigned N = TySize / (MinABIStackAlignInBytes * 8); N; --N) - ArgList.push_back(IntTy); - - // If necessary, add one more integer type to ArgList. - unsigned R = TySize % (MinABIStackAlignInBytes * 8); - - if (R) - ArgList.push_back(llvm::IntegerType::get(getVMContext(), R)); -} - -// In N32/64, an aligned double precision floating point field is passed in -// a register. -llvm::Type* MipsABIInfo::HandleAggregates(QualType Ty, uint64_t TySize) const { - SmallVector ArgList, IntArgList; - - if (IsO32) { - CoerceToIntArgs(TySize, ArgList); - return llvm::StructType::get(getVMContext(), ArgList); - } - - if (Ty->isComplexType()) - return CGT.ConvertType(Ty); - - const RecordType *RT = Ty->getAs(); - - // Unions/vectors are passed in integer registers. - if (!RT || !RT->isStructureOrClassType()) { - CoerceToIntArgs(TySize, ArgList); - return llvm::StructType::get(getVMContext(), ArgList); - } - - const RecordDecl *RD = RT->getDecl(); - const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); - assert(!(TySize % 8) && "Size of structure must be multiple of 8."); - - uint64_t LastOffset = 0; - unsigned idx = 0; - llvm::IntegerType *I64 = llvm::IntegerType::get(getVMContext(), 64); - - // Iterate over fields in the struct/class and check if there are any aligned - // double fields. - for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); - i != e; ++i, ++idx) { - const QualType Ty = i->getType(); - const BuiltinType *BT = Ty->getAs(); - - if (!BT || BT->getKind() != BuiltinType::Double) - continue; - - uint64_t Offset = Layout.getFieldOffset(idx); - if (Offset % 64) // Ignore doubles that are not aligned. - continue; - - // Add ((Offset - LastOffset) / 64) args of type i64. - for (unsigned j = (Offset - LastOffset) / 64; j > 0; --j) - ArgList.push_back(I64); - - // Add double type. - ArgList.push_back(llvm::Type::getDoubleTy(getVMContext())); - LastOffset = Offset + 64; - } - - CoerceToIntArgs(TySize - LastOffset, IntArgList); - ArgList.append(IntArgList.begin(), IntArgList.end()); - - return llvm::StructType::get(getVMContext(), ArgList); -} - -llvm::Type *MipsABIInfo::getPaddingType(uint64_t OrigOffset, - uint64_t Offset) const { - if (OrigOffset + MinABIStackAlignInBytes > Offset) - return nullptr; - - return llvm::IntegerType::get(getVMContext(), (Offset - OrigOffset) * 8); -} - -ABIArgInfo -MipsABIInfo::classifyArgumentType(QualType Ty, uint64_t &Offset) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - uint64_t OrigOffset = Offset; - uint64_t TySize = getContext().getTypeSize(Ty); - uint64_t Align = getContext().getTypeAlign(Ty) / 8; - - Align = std::clamp(Align, (uint64_t)MinABIStackAlignInBytes, - (uint64_t)StackAlignInBytes); - unsigned CurrOffset = llvm::alignTo(Offset, Align); - Offset = CurrOffset + llvm::alignTo(TySize, Align * 8) / 8; - - if (isAggregateTypeForABI(Ty) || Ty->isVectorType()) { - // Ignore empty aggregates. - if (TySize == 0) - return ABIArgInfo::getIgnore(); - - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { - Offset = OrigOffset + MinABIStackAlignInBytes; - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - } - - // If we have reached here, aggregates are passed directly by coercing to - // another structure type. Padding is inserted if the offset of the - // aggregate is unaligned. - ABIArgInfo ArgInfo = - ABIArgInfo::getDirect(HandleAggregates(Ty, TySize), 0, - getPaddingType(OrigOffset, CurrOffset)); - ArgInfo.setInReg(true); - return ArgInfo; - } - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // Make sure we pass indirectly things that are too large. - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > 128 || - (EIT->getNumBits() > 64 && - !getContext().getTargetInfo().hasInt128Type())) - return getNaturalAlignIndirect(Ty); - - // All integral types are promoted to the GPR width. - if (Ty->isIntegralOrEnumerationType()) - return extendType(Ty); - - return ABIArgInfo::getDirect( - nullptr, 0, IsO32 ? nullptr : getPaddingType(OrigOffset, CurrOffset)); -} - -llvm::Type* -MipsABIInfo::returnAggregateInRegs(QualType RetTy, uint64_t Size) const { - const RecordType *RT = RetTy->getAs(); - SmallVector RTList; - - if (RT && RT->isStructureOrClassType()) { - const RecordDecl *RD = RT->getDecl(); - const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); - unsigned FieldCnt = Layout.getFieldCount(); - - // N32/64 returns struct/classes in floating point registers if the - // following conditions are met: - // 1. The size of the struct/class is no larger than 128-bit. - // 2. The struct/class has one or two fields all of which are floating - // point types. - // 3. The offset of the first field is zero (this follows what gcc does). - // - // Any other composite results are returned in integer registers. - // - if (FieldCnt && (FieldCnt <= 2) && !Layout.getFieldOffset(0)) { - RecordDecl::field_iterator b = RD->field_begin(), e = RD->field_end(); - for (; b != e; ++b) { - const BuiltinType *BT = b->getType()->getAs(); - - if (!BT || !BT->isFloatingPoint()) - break; - - RTList.push_back(CGT.ConvertType(b->getType())); - } - - if (b == e) - return llvm::StructType::get(getVMContext(), RTList, - RD->hasAttr()); - - RTList.clear(); - } - } - - CoerceToIntArgs(Size, RTList); - return llvm::StructType::get(getVMContext(), RTList); -} - -ABIArgInfo MipsABIInfo::classifyReturnType(QualType RetTy) const { - uint64_t Size = getContext().getTypeSize(RetTy); - - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - // O32 doesn't treat zero-sized structs differently from other structs. - // However, N32/N64 ignores zero sized return values. - if (!IsO32 && Size == 0) - return ABIArgInfo::getIgnore(); - - if (isAggregateTypeForABI(RetTy) || RetTy->isVectorType()) { - if (Size <= 128) { - if (RetTy->isAnyComplexType()) - return ABIArgInfo::getDirect(); - - // O32 returns integer vectors in registers and N32/N64 returns all small - // aggregates in registers. - if (!IsO32 || - (RetTy->isVectorType() && !RetTy->hasFloatingRepresentation())) { - ABIArgInfo ArgInfo = - ABIArgInfo::getDirect(returnAggregateInRegs(RetTy, Size)); - ArgInfo.setInReg(true); - return ArgInfo; - } - } - - return getNaturalAlignIndirect(RetTy); - } - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - // Make sure we pass indirectly things that are too large. - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > 128 || - (EIT->getNumBits() > 64 && - !getContext().getTargetInfo().hasInt128Type())) - return getNaturalAlignIndirect(RetTy); - - if (isPromotableIntegerTypeForABI(RetTy)) - return ABIArgInfo::getExtend(RetTy); - - if ((RetTy->isUnsignedIntegerOrEnumerationType() || - RetTy->isSignedIntegerOrEnumerationType()) && Size == 32 && !IsO32) - return ABIArgInfo::getSignExtend(RetTy); - - return ABIArgInfo::getDirect(); -} - -void MipsABIInfo::computeInfo(CGFunctionInfo &FI) const { - ABIArgInfo &RetInfo = FI.getReturnInfo(); - if (!getCXXABI().classifyReturnType(FI)) - RetInfo = classifyReturnType(FI.getReturnType()); - - // Check if a pointer to an aggregate is passed as a hidden argument. - uint64_t Offset = RetInfo.isIndirect() ? MinABIStackAlignInBytes : 0; - - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type, Offset); -} - -Address MipsABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType OrigTy) const { - QualType Ty = OrigTy; - - // Integer arguments are promoted to 32-bit on O32 and 64-bit on N32/N64. - // Pointers are also promoted in the same way but this only matters for N32. - unsigned SlotSizeInBits = IsO32 ? 32 : 64; - unsigned PtrWidth = getTarget().getPointerWidth(LangAS::Default); - bool DidPromote = false; - if ((Ty->isIntegerType() && - getContext().getIntWidth(Ty) < SlotSizeInBits) || - (Ty->isPointerType() && PtrWidth < SlotSizeInBits)) { - DidPromote = true; - Ty = getContext().getIntTypeForBitwidth(SlotSizeInBits, - Ty->isSignedIntegerType()); - } - - auto TyInfo = getContext().getTypeInfoInChars(Ty); - - // The alignment of things in the argument area is never larger than - // StackAlignInBytes. - TyInfo.Align = - std::min(TyInfo.Align, CharUnits::fromQuantity(StackAlignInBytes)); - - // MinABIStackAlignInBytes is the size of argument slots on the stack. - CharUnits ArgSlotSize = CharUnits::fromQuantity(MinABIStackAlignInBytes); - - Address Addr = emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false, - TyInfo, ArgSlotSize, /*AllowHigherAlign*/ true); - - - // If there was a promotion, "unpromote" into a temporary. - // TODO: can we just use a pointer into a subset of the original slot? - if (DidPromote) { - Address Temp = CGF.CreateMemTemp(OrigTy, "vaarg.promotion-temp"); - llvm::Value *Promoted = CGF.Builder.CreateLoad(Addr); - - // Truncate down to the right width. - llvm::Type *IntTy = (OrigTy->isIntegerType() ? Temp.getElementType() - : CGF.IntPtrTy); - llvm::Value *V = CGF.Builder.CreateTrunc(Promoted, IntTy); - if (OrigTy->isPointerType()) - V = CGF.Builder.CreateIntToPtr(V, Temp.getElementType()); - - CGF.Builder.CreateStore(V, Temp); - Addr = Temp; - } - - return Addr; -} - -ABIArgInfo MipsABIInfo::extendType(QualType Ty) const { - int TySize = getContext().getTypeSize(Ty); - - // MIPS64 ABI requires unsigned 32 bit integers to be sign extended. - if (Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32) - return ABIArgInfo::getSignExtend(Ty); - - return ABIArgInfo::getExtend(Ty); -} - -bool -MIPSTargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const { - // This information comes from gcc's implementation, which seems to - // as canonical as it gets. - - // Everything on MIPS is 4 bytes. Double-precision FP registers - // are aliased to pairs of single-precision FP registers. - llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4); - - // 0-31 are the general purpose registers, $0 - $31. - // 32-63 are the floating-point registers, $f0 - $f31. - // 64 and 65 are the multiply/divide registers, $hi and $lo. - // 66 is the (notional, I think) register for signal-handler return. - AssignToArrayRange(CGF.Builder, Address, Four8, 0, 65); - - // 67-74 are the floating-point status registers, $fcc0 - $fcc7. - // They are one bit wide and ignored here. - - // 80-111 are the coprocessor 0 registers, $c0r0 - $c0r31. - // (coprocessor 1 is the FP unit) - // 112-143 are the coprocessor 2 registers, $c2r0 - $c2r31. - // 144-175 are the coprocessor 3 registers, $c3r0 - $c3r31. - // 176-181 are the DSP accumulator registers. - AssignToArrayRange(CGF.Builder, Address, Four8, 80, 181); - return false; -} - -//===----------------------------------------------------------------------===// -// M68k ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class M68kTargetCodeGenInfo : public TargetCodeGenInfo { -public: - M68kTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &M) const override; -}; - -} // namespace - -void M68kTargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { - if (const auto *FD = dyn_cast_or_null(D)) { - if (const auto *attr = FD->getAttr()) { - // Handle 'interrupt' attribute: - llvm::Function *F = cast(GV); - - // Step 1: Set ISR calling convention. - F->setCallingConv(llvm::CallingConv::M68k_INTR); - - // Step 2: Add attributes goodness. - F->addFnAttr(llvm::Attribute::NoInline); - - // Step 3: Emit ISR vector alias. - unsigned Num = attr->getNumber() / 2; - llvm::GlobalAlias::create(llvm::Function::ExternalLinkage, - "__isr_" + Twine(Num), F); - } - } -} - -//===----------------------------------------------------------------------===// -// AVR ABI Implementation. Documented at -// https://gcc.gnu.org/wiki/avr-gcc#Calling_Convention -// https://gcc.gnu.org/wiki/avr-gcc#Reduced_Tiny -//===----------------------------------------------------------------------===// - -namespace { -class AVRABIInfo : public DefaultABIInfo { -private: - // The total amount of registers can be used to pass parameters. It is 18 on - // AVR, or 6 on AVRTiny. - const unsigned ParamRegs; - // The total amount of registers can be used to pass return value. It is 8 on - // AVR, or 4 on AVRTiny. - const unsigned RetRegs; - -public: - AVRABIInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR) - : DefaultABIInfo(CGT), ParamRegs(NPR), RetRegs(NRR) {} - - ABIArgInfo classifyReturnType(QualType Ty, bool &LargeRet) const { - // On AVR, a return struct with size less than or equals to 8 bytes is - // returned directly via registers R18-R25. On AVRTiny, a return struct - // with size less than or equals to 4 bytes is returned directly via - // registers R22-R25. - if (isAggregateTypeForABI(Ty) && - getContext().getTypeSize(Ty) <= RetRegs * 8) - return ABIArgInfo::getDirect(); - // A return value (struct or scalar) with larger size is returned via a - // stack slot, along with a pointer as the function's implicit argument. - if (getContext().getTypeSize(Ty) > RetRegs * 8) { - LargeRet = true; - return getNaturalAlignIndirect(Ty); - } - // An i8 return value should not be extended to i16, since AVR has 8-bit - // registers. - if (Ty->isIntegralOrEnumerationType() && getContext().getTypeSize(Ty) <= 8) - return ABIArgInfo::getDirect(); - // Otherwise we follow the default way which is compatible. - return DefaultABIInfo::classifyReturnType(Ty); - } - - ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegs) const { - unsigned TySize = getContext().getTypeSize(Ty); - - // An int8 type argument always costs two registers like an int16. - if (TySize == 8 && NumRegs >= 2) { - NumRegs -= 2; - return ABIArgInfo::getExtend(Ty); - } - - // If the argument size is an odd number of bytes, round up the size - // to the next even number. - TySize = llvm::alignTo(TySize, 16); - - // Any type including an array/struct type can be passed in rgisters, - // if there are enough registers left. - if (TySize <= NumRegs * 8) { - NumRegs -= TySize / 8; - return ABIArgInfo::getDirect(); - } - - // An argument is passed either completely in registers or completely in - // memory. Since there are not enough registers left, current argument - // and all other unprocessed arguments should be passed in memory. - // However we still need to return `ABIArgInfo::getDirect()` other than - // `ABIInfo::getNaturalAlignIndirect(Ty)`, otherwise an extra stack slot - // will be allocated, so the stack frame layout will be incompatible with - // avr-gcc. - NumRegs = 0; - return ABIArgInfo::getDirect(); - } - - void computeInfo(CGFunctionInfo &FI) const override { - // Decide the return type. - bool LargeRet = false; - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), LargeRet); - - // Decide each argument type. The total number of registers can be used for - // arguments depends on several factors: - // 1. Arguments of varargs functions are passed on the stack. This applies - // even to the named arguments. So no register can be used. - // 2. Total 18 registers can be used on avr and 6 ones on avrtiny. - // 3. If the return type is a struct with too large size, two registers - // (out of 18/6) will be cost as an implicit pointer argument. - unsigned NumRegs = ParamRegs; - if (FI.isVariadic()) - NumRegs = 0; - else if (LargeRet) - NumRegs -= 2; - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type, NumRegs); - } -}; - -class AVRTargetCodeGenInfo : public TargetCodeGenInfo { -public: - AVRTargetCodeGenInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR) - : TargetCodeGenInfo(std::make_unique(CGT, NPR, NRR)) {} - - LangAS getGlobalVarAddressSpace(CodeGenModule &CGM, - const VarDecl *D) const override { - // Check if global/static variable is defined in address space - // 1~6 (__flash, __flash1, __flash2, __flash3, __flash4, __flash5) - // but not constant. - if (D) { - LangAS AS = D->getType().getAddressSpace(); - if (isTargetAddressSpace(AS) && 1 <= toTargetAddressSpace(AS) && - toTargetAddressSpace(AS) <= 6 && !D->getType().isConstQualified()) - CGM.getDiags().Report(D->getLocation(), - diag::err_verify_nonconst_addrspace) - << "__flash*"; - } - return TargetCodeGenInfo::getGlobalVarAddressSpace(CGM, D); - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - if (GV->isDeclaration()) - return; - const auto *FD = dyn_cast_or_null(D); - if (!FD) return; - auto *Fn = cast(GV); - - if (FD->getAttr()) - Fn->addFnAttr("interrupt"); - - if (FD->getAttr()) - Fn->addFnAttr("signal"); - } -}; -} - -//===----------------------------------------------------------------------===// -// TCE ABI Implementation (see http://tce.cs.tut.fi). Uses mostly the defaults. -// Currently subclassed only to implement custom OpenCL C function attribute -// handling. -//===----------------------------------------------------------------------===// - -namespace { - -class TCETargetCodeGenInfo : public TargetCodeGenInfo { -public: - TCETargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &M) const override; -}; - -void TCETargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { - if (GV->isDeclaration()) - return; - const FunctionDecl *FD = dyn_cast_or_null(D); - if (!FD) return; - - llvm::Function *F = cast(GV); - - if (M.getLangOpts().OpenCL) { - if (FD->hasAttr()) { - // OpenCL C Kernel functions are not subject to inlining - F->addFnAttr(llvm::Attribute::NoInline); - const ReqdWorkGroupSizeAttr *Attr = FD->getAttr(); - if (Attr) { - // Convert the reqd_work_group_size() attributes to metadata. - llvm::LLVMContext &Context = F->getContext(); - llvm::NamedMDNode *OpenCLMetadata = - M.getModule().getOrInsertNamedMetadata( - "opencl.kernel_wg_size_info"); - - SmallVector Operands; - Operands.push_back(llvm::ConstantAsMetadata::get(F)); - - Operands.push_back( - llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue( - M.Int32Ty, llvm::APInt(32, Attr->getXDim())))); - Operands.push_back( - llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue( - M.Int32Ty, llvm::APInt(32, Attr->getYDim())))); - Operands.push_back( - llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue( - M.Int32Ty, llvm::APInt(32, Attr->getZDim())))); - - // Add a boolean constant operand for "required" (true) or "hint" - // (false) for implementing the work_group_size_hint attr later. - // Currently always true as the hint is not yet implemented. - Operands.push_back( - llvm::ConstantAsMetadata::get(llvm::ConstantInt::getTrue(Context))); - OpenCLMetadata->addOperand(llvm::MDNode::get(Context, Operands)); - } - } - } -} - -} - -//===----------------------------------------------------------------------===// -// Hexagon ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class HexagonABIInfo : public DefaultABIInfo { -public: - HexagonABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - -private: - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType RetTy, unsigned *RegsLeft) const; - - void computeInfo(CGFunctionInfo &FI) const override; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - Address EmitVAArgFromMemory(CodeGenFunction &CFG, Address VAListAddr, - QualType Ty) const; - Address EmitVAArgForHexagon(CodeGenFunction &CFG, Address VAListAddr, - QualType Ty) const; - Address EmitVAArgForHexagonLinux(CodeGenFunction &CFG, Address VAListAddr, - QualType Ty) const; -}; - -class HexagonTargetCodeGenInfo : public TargetCodeGenInfo { -public: - HexagonTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - return 29; - } - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &GCM) const override { - if (GV->isDeclaration()) - return; - const FunctionDecl *FD = dyn_cast_or_null(D); - if (!FD) - return; - } -}; - -} // namespace - -void HexagonABIInfo::computeInfo(CGFunctionInfo &FI) const { - unsigned RegsLeft = 6; - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type, &RegsLeft); -} - -static bool HexagonAdjustRegsLeft(uint64_t Size, unsigned *RegsLeft) { - assert(Size <= 64 && "Not expecting to pass arguments larger than 64 bits" - " through registers"); - - if (*RegsLeft == 0) - return false; - - if (Size <= 32) { - (*RegsLeft)--; - return true; - } - - if (2 <= (*RegsLeft & (~1U))) { - *RegsLeft = (*RegsLeft & (~1U)) - 2; - return true; - } - - // Next available register was r5 but candidate was greater than 32-bits so it - // has to go on the stack. However we still consume r5 - if (*RegsLeft == 1) - *RegsLeft = 0; - - return false; -} - -ABIArgInfo HexagonABIInfo::classifyArgumentType(QualType Ty, - unsigned *RegsLeft) const { - if (!isAggregateTypeForABI(Ty)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - uint64_t Size = getContext().getTypeSize(Ty); - if (Size <= 64) - HexagonAdjustRegsLeft(Size, RegsLeft); - - if (Size > 64 && Ty->isBitIntType()) - return getNaturalAlignIndirect(Ty, /*ByVal=*/true); - - return isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect(); - } - - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - // Ignore empty records. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - uint64_t Size = getContext().getTypeSize(Ty); - unsigned Align = getContext().getTypeAlign(Ty); - - if (Size > 64) - return getNaturalAlignIndirect(Ty, /*ByVal=*/true); - - if (HexagonAdjustRegsLeft(Size, RegsLeft)) - Align = Size <= 32 ? 32 : 64; - if (Size <= Align) { - // Pass in the smallest viable integer type. - Size = llvm::bit_ceil(Size); - return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size)); - } - return DefaultABIInfo::classifyArgumentType(Ty); -} - -ABIArgInfo HexagonABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - const TargetInfo &T = CGT.getTarget(); - uint64_t Size = getContext().getTypeSize(RetTy); - - if (RetTy->getAs()) { - // HVX vectors are returned in vector registers or register pairs. - if (T.hasFeature("hvx")) { - assert(T.hasFeature("hvx-length64b") || T.hasFeature("hvx-length128b")); - uint64_t VecSize = T.hasFeature("hvx-length64b") ? 64*8 : 128*8; - if (Size == VecSize || Size == 2*VecSize) - return ABIArgInfo::getDirectInReg(); - } - // Large vector types should be returned via memory. - if (Size > 64) - return getNaturalAlignIndirect(RetTy); - } - - if (!isAggregateTypeForABI(RetTy)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - if (Size > 64 && RetTy->isBitIntType()) - return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); - - return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) - : ABIArgInfo::getDirect(); - } - - if (isEmptyRecord(getContext(), RetTy, true)) - return ABIArgInfo::getIgnore(); - - // Aggregates <= 8 bytes are returned in registers, other aggregates - // are returned indirectly. - if (Size <= 64) { - // Return in the smallest viable integer type. - Size = llvm::bit_ceil(Size); - return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size)); - } - return getNaturalAlignIndirect(RetTy, /*ByVal=*/true); -} - -Address HexagonABIInfo::EmitVAArgFromMemory(CodeGenFunction &CGF, - Address VAListAddr, - QualType Ty) const { - // Load the overflow area pointer. - Address __overflow_area_pointer_p = - CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p"); - llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad( - __overflow_area_pointer_p, "__overflow_area_pointer"); - - uint64_t Align = CGF.getContext().getTypeAlign(Ty) / 8; - if (Align > 4) { - // Alignment should be a power of 2. - assert((Align & (Align - 1)) == 0 && "Alignment is not power of 2!"); - - // overflow_arg_area = (overflow_arg_area + align - 1) & -align; - llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int64Ty, Align - 1); - - // Add offset to the current pointer to access the argument. - __overflow_area_pointer = - CGF.Builder.CreateGEP(CGF.Int8Ty, __overflow_area_pointer, Offset); - llvm::Value *AsInt = - CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty); - - // Create a mask which should be "AND"ed - // with (overflow_arg_area + align - 1) - llvm::Value *Mask = llvm::ConstantInt::get(CGF.Int32Ty, -(int)Align); - __overflow_area_pointer = CGF.Builder.CreateIntToPtr( - CGF.Builder.CreateAnd(AsInt, Mask), __overflow_area_pointer->getType(), - "__overflow_area_pointer.align"); - } - - // Get the type of the argument from memory and bitcast - // overflow area pointer to the argument type. - llvm::Type *PTy = CGF.ConvertTypeForMem(Ty); - Address AddrTyped = CGF.Builder.CreateElementBitCast( - Address(__overflow_area_pointer, CGF.Int8Ty, - CharUnits::fromQuantity(Align)), - PTy); - - // Round up to the minimum stack alignment for varargs which is 4 bytes. - uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4); - - __overflow_area_pointer = CGF.Builder.CreateGEP( - CGF.Int8Ty, __overflow_area_pointer, - llvm::ConstantInt::get(CGF.Int32Ty, Offset), - "__overflow_area_pointer.next"); - CGF.Builder.CreateStore(__overflow_area_pointer, __overflow_area_pointer_p); - - return AddrTyped; -} - -Address HexagonABIInfo::EmitVAArgForHexagon(CodeGenFunction &CGF, - Address VAListAddr, - QualType Ty) const { - // FIXME: Need to handle alignment - llvm::Type *BP = CGF.Int8PtrTy; - CGBuilderTy &Builder = CGF.Builder; - Address VAListAddrAsBPP = Builder.CreateElementBitCast(VAListAddr, BP, "ap"); - llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur"); - // Handle address alignment for type alignment > 32 bits - uint64_t TyAlign = CGF.getContext().getTypeAlign(Ty) / 8; - if (TyAlign > 4) { - assert((TyAlign & (TyAlign - 1)) == 0 && "Alignment is not power of 2!"); - llvm::Value *AddrAsInt = Builder.CreatePtrToInt(Addr, CGF.Int32Ty); - AddrAsInt = Builder.CreateAdd(AddrAsInt, Builder.getInt32(TyAlign - 1)); - AddrAsInt = Builder.CreateAnd(AddrAsInt, Builder.getInt32(~(TyAlign - 1))); - Addr = Builder.CreateIntToPtr(AddrAsInt, BP); - } - Address AddrTyped = Builder.CreateElementBitCast( - Address(Addr, CGF.Int8Ty, CharUnits::fromQuantity(TyAlign)), - CGF.ConvertType(Ty)); - - uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4); - llvm::Value *NextAddr = Builder.CreateGEP( - CGF.Int8Ty, Addr, llvm::ConstantInt::get(CGF.Int32Ty, Offset), "ap.next"); - Builder.CreateStore(NextAddr, VAListAddrAsBPP); - - return AddrTyped; -} - -Address HexagonABIInfo::EmitVAArgForHexagonLinux(CodeGenFunction &CGF, - Address VAListAddr, - QualType Ty) const { - int ArgSize = CGF.getContext().getTypeSize(Ty) / 8; - - if (ArgSize > 8) - return EmitVAArgFromMemory(CGF, VAListAddr, Ty); - - // Here we have check if the argument is in register area or - // in overflow area. - // If the saved register area pointer + argsize rounded up to alignment > - // saved register area end pointer, argument is in overflow area. - unsigned RegsLeft = 6; - Ty = CGF.getContext().getCanonicalType(Ty); - (void)classifyArgumentType(Ty, &RegsLeft); - - llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg"); - llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); - llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack"); - llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); - - // Get rounded size of the argument.GCC does not allow vararg of - // size < 4 bytes. We follow the same logic here. - ArgSize = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8; - int ArgAlign = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8; - - // Argument may be in saved register area - CGF.EmitBlock(MaybeRegBlock); - - // Load the current saved register area pointer. - Address __current_saved_reg_area_pointer_p = CGF.Builder.CreateStructGEP( - VAListAddr, 0, "__current_saved_reg_area_pointer_p"); - llvm::Value *__current_saved_reg_area_pointer = CGF.Builder.CreateLoad( - __current_saved_reg_area_pointer_p, "__current_saved_reg_area_pointer"); - - // Load the saved register area end pointer. - Address __saved_reg_area_end_pointer_p = CGF.Builder.CreateStructGEP( - VAListAddr, 1, "__saved_reg_area_end_pointer_p"); - llvm::Value *__saved_reg_area_end_pointer = CGF.Builder.CreateLoad( - __saved_reg_area_end_pointer_p, "__saved_reg_area_end_pointer"); - - // If the size of argument is > 4 bytes, check if the stack - // location is aligned to 8 bytes - if (ArgAlign > 4) { - - llvm::Value *__current_saved_reg_area_pointer_int = - CGF.Builder.CreatePtrToInt(__current_saved_reg_area_pointer, - CGF.Int32Ty); - - __current_saved_reg_area_pointer_int = CGF.Builder.CreateAdd( - __current_saved_reg_area_pointer_int, - llvm::ConstantInt::get(CGF.Int32Ty, (ArgAlign - 1)), - "align_current_saved_reg_area_pointer"); - - __current_saved_reg_area_pointer_int = - CGF.Builder.CreateAnd(__current_saved_reg_area_pointer_int, - llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign), - "align_current_saved_reg_area_pointer"); - - __current_saved_reg_area_pointer = - CGF.Builder.CreateIntToPtr(__current_saved_reg_area_pointer_int, - __current_saved_reg_area_pointer->getType(), - "align_current_saved_reg_area_pointer"); - } - - llvm::Value *__new_saved_reg_area_pointer = - CGF.Builder.CreateGEP(CGF.Int8Ty, __current_saved_reg_area_pointer, - llvm::ConstantInt::get(CGF.Int32Ty, ArgSize), - "__new_saved_reg_area_pointer"); - - llvm::Value *UsingStack = nullptr; - UsingStack = CGF.Builder.CreateICmpSGT(__new_saved_reg_area_pointer, - __saved_reg_area_end_pointer); - - CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, InRegBlock); - - // Argument in saved register area - // Implement the block where argument is in register saved area - CGF.EmitBlock(InRegBlock); - - llvm::Type *PTy = CGF.ConvertType(Ty); - llvm::Value *__saved_reg_area_p = CGF.Builder.CreateBitCast( - __current_saved_reg_area_pointer, llvm::PointerType::getUnqual(PTy)); - - CGF.Builder.CreateStore(__new_saved_reg_area_pointer, - __current_saved_reg_area_pointer_p); - - CGF.EmitBranch(ContBlock); - - // Argument in overflow area - // Implement the block where the argument is in overflow area. - CGF.EmitBlock(OnStackBlock); - - // Load the overflow area pointer - Address __overflow_area_pointer_p = - CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p"); - llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad( - __overflow_area_pointer_p, "__overflow_area_pointer"); - - // Align the overflow area pointer according to the alignment of the argument - if (ArgAlign > 4) { - llvm::Value *__overflow_area_pointer_int = - CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty); - - __overflow_area_pointer_int = - CGF.Builder.CreateAdd(__overflow_area_pointer_int, - llvm::ConstantInt::get(CGF.Int32Ty, ArgAlign - 1), - "align_overflow_area_pointer"); - - __overflow_area_pointer_int = - CGF.Builder.CreateAnd(__overflow_area_pointer_int, - llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign), - "align_overflow_area_pointer"); - - __overflow_area_pointer = CGF.Builder.CreateIntToPtr( - __overflow_area_pointer_int, __overflow_area_pointer->getType(), - "align_overflow_area_pointer"); - } - - // Get the pointer for next argument in overflow area and store it - // to overflow area pointer. - llvm::Value *__new_overflow_area_pointer = CGF.Builder.CreateGEP( - CGF.Int8Ty, __overflow_area_pointer, - llvm::ConstantInt::get(CGF.Int32Ty, ArgSize), - "__overflow_area_pointer.next"); - - CGF.Builder.CreateStore(__new_overflow_area_pointer, - __overflow_area_pointer_p); - - CGF.Builder.CreateStore(__new_overflow_area_pointer, - __current_saved_reg_area_pointer_p); - - // Bitcast the overflow area pointer to the type of argument. - llvm::Type *OverflowPTy = CGF.ConvertTypeForMem(Ty); - llvm::Value *__overflow_area_p = CGF.Builder.CreateBitCast( - __overflow_area_pointer, llvm::PointerType::getUnqual(OverflowPTy)); - - CGF.EmitBranch(ContBlock); - - // Get the correct pointer to load the variable argument - // Implement the ContBlock - CGF.EmitBlock(ContBlock); - - llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty); - llvm::Type *MemPTy = llvm::PointerType::getUnqual(MemTy); - llvm::PHINode *ArgAddr = CGF.Builder.CreatePHI(MemPTy, 2, "vaarg.addr"); - ArgAddr->addIncoming(__saved_reg_area_p, InRegBlock); - ArgAddr->addIncoming(__overflow_area_p, OnStackBlock); - - return Address(ArgAddr, MemTy, CharUnits::fromQuantity(ArgAlign)); -} - -Address HexagonABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - - if (getTarget().getTriple().isMusl()) - return EmitVAArgForHexagonLinux(CGF, VAListAddr, Ty); - - return EmitVAArgForHexagon(CGF, VAListAddr, Ty); -} - -//===----------------------------------------------------------------------===// -// Lanai ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { -class LanaiABIInfo : public DefaultABIInfo { - struct CCState { - unsigned FreeRegs; - }; - -public: - LanaiABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - - bool shouldUseInReg(QualType Ty, CCState &State) const; - - void computeInfo(CGFunctionInfo &FI) const override { - CCState State; - // Lanai uses 4 registers to pass arguments unless the function has the - // regparm attribute set. - if (FI.getHasRegParm()) { - State.FreeRegs = FI.getRegParm(); - } else { - State.FreeRegs = 4; - } - - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type, State); - } - - ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const; - ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const; -}; -} // end anonymous namespace - -bool LanaiABIInfo::shouldUseInReg(QualType Ty, CCState &State) const { - unsigned Size = getContext().getTypeSize(Ty); - unsigned SizeInRegs = llvm::alignTo(Size, 32U) / 32U; - - if (SizeInRegs == 0) - return false; - - if (SizeInRegs > State.FreeRegs) { - State.FreeRegs = 0; - return false; - } - - State.FreeRegs -= SizeInRegs; - - return true; -} - -ABIArgInfo LanaiABIInfo::getIndirectResult(QualType Ty, bool ByVal, - CCState &State) const { - if (!ByVal) { - if (State.FreeRegs) { - --State.FreeRegs; // Non-byval indirects just use one pointer. - return getNaturalAlignIndirectInReg(Ty); - } - return getNaturalAlignIndirect(Ty, false); - } - - // Compute the byval alignment. - const unsigned MinABIStackAlignInBytes = 4; - unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8; - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true, - /*Realign=*/TypeAlign > - MinABIStackAlignInBytes); -} - -ABIArgInfo LanaiABIInfo::classifyArgumentType(QualType Ty, - CCState &State) const { - // Check with the C++ ABI first. - const RecordType *RT = Ty->getAs(); - if (RT) { - CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()); - if (RAA == CGCXXABI::RAA_Indirect) { - return getIndirectResult(Ty, /*ByVal=*/false, State); - } else if (RAA == CGCXXABI::RAA_DirectInMemory) { - return getNaturalAlignIndirect(Ty, /*ByVal=*/true); - } - } - - if (isAggregateTypeForABI(Ty)) { - // Structures with flexible arrays are always indirect. - if (RT && RT->getDecl()->hasFlexibleArrayMember()) - return getIndirectResult(Ty, /*ByVal=*/true, State); - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - llvm::LLVMContext &LLVMContext = getVMContext(); - unsigned SizeInRegs = (getContext().getTypeSize(Ty) + 31) / 32; - if (SizeInRegs <= State.FreeRegs) { - llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext); - SmallVector Elements(SizeInRegs, Int32); - llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements); - State.FreeRegs -= SizeInRegs; - return ABIArgInfo::getDirectInReg(Result); - } else { - State.FreeRegs = 0; - } - return getIndirectResult(Ty, true, State); - } - - // Treat an enum type as its underlying type. - if (const auto *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - bool InReg = shouldUseInReg(Ty, State); - - // Don't pass >64 bit integers in registers. - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > 64) - return getIndirectResult(Ty, /*ByVal=*/true, State); - - if (isPromotableIntegerTypeForABI(Ty)) { - if (InReg) - return ABIArgInfo::getDirectInReg(); - return ABIArgInfo::getExtend(Ty); - } - if (InReg) - return ABIArgInfo::getDirectInReg(); - return ABIArgInfo::getDirect(); -} - -namespace { -class LanaiTargetCodeGenInfo : public TargetCodeGenInfo { -public: - LanaiTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} -}; -} - -//===----------------------------------------------------------------------===// -// AMDGPU ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class AMDGPUABIInfo final : public DefaultABIInfo { -private: - static const unsigned MaxNumRegsForArgsRet = 16; - - unsigned numRegsForType(QualType Ty) const; - - bool isHomogeneousAggregateBaseType(QualType Ty) const override; - bool isHomogeneousAggregateSmallEnough(const Type *Base, - uint64_t Members) const override; - - // Coerce HIP scalar pointer arguments from generic pointers to global ones. - llvm::Type *coerceKernelArgumentType(llvm::Type *Ty, unsigned FromAS, - unsigned ToAS) const { - // Single value types. - auto *PtrTy = llvm::dyn_cast(Ty); - if (PtrTy && PtrTy->getAddressSpace() == FromAS) - return llvm::PointerType::get(Ty->getContext(), ToAS); - return Ty; - } - -public: - explicit AMDGPUABIInfo(CodeGen::CodeGenTypes &CGT) : - DefaultABIInfo(CGT) {} - - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyKernelArgumentType(QualType Ty) const; - ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegsLeft) const; - - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -bool AMDGPUABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { - return true; -} - -bool AMDGPUABIInfo::isHomogeneousAggregateSmallEnough( - const Type *Base, uint64_t Members) const { - uint32_t NumRegs = (getContext().getTypeSize(Base) + 31) / 32; - - // Homogeneous Aggregates may occupy at most 16 registers. - return Members * NumRegs <= MaxNumRegsForArgsRet; -} - -/// Estimate number of registers the type will use when passed in registers. -unsigned AMDGPUABIInfo::numRegsForType(QualType Ty) const { - unsigned NumRegs = 0; - - if (const VectorType *VT = Ty->getAs()) { - // Compute from the number of elements. The reported size is based on the - // in-memory size, which includes the padding 4th element for 3-vectors. - QualType EltTy = VT->getElementType(); - unsigned EltSize = getContext().getTypeSize(EltTy); - - // 16-bit element vectors should be passed as packed. - if (EltSize == 16) - return (VT->getNumElements() + 1) / 2; - - unsigned EltNumRegs = (EltSize + 31) / 32; - return EltNumRegs * VT->getNumElements(); - } - - if (const RecordType *RT = Ty->getAs()) { - const RecordDecl *RD = RT->getDecl(); - assert(!RD->hasFlexibleArrayMember()); - - for (const FieldDecl *Field : RD->fields()) { - QualType FieldTy = Field->getType(); - NumRegs += numRegsForType(FieldTy); - } - - return NumRegs; - } - - return (getContext().getTypeSize(Ty) + 31) / 32; -} - -void AMDGPUABIInfo::computeInfo(CGFunctionInfo &FI) const { - llvm::CallingConv::ID CC = FI.getCallingConvention(); - - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - - unsigned NumRegsLeft = MaxNumRegsForArgsRet; - for (auto &Arg : FI.arguments()) { - if (CC == llvm::CallingConv::AMDGPU_KERNEL) { - Arg.info = classifyKernelArgumentType(Arg.type); - } else { - Arg.info = classifyArgumentType(Arg.type, NumRegsLeft); - } - } -} - -Address AMDGPUABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - llvm_unreachable("AMDGPU does not support varargs"); -} - -ABIArgInfo AMDGPUABIInfo::classifyReturnType(QualType RetTy) const { - if (isAggregateTypeForABI(RetTy)) { - // Records with non-trivial destructors/copy-constructors should not be - // returned by value. - if (!getRecordArgABI(RetTy, getCXXABI())) { - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), RetTy, true)) - return ABIArgInfo::getIgnore(); - - // Lower single-element structs to just return a regular value. - if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext())) - return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); - - if (const RecordType *RT = RetTy->getAs()) { - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return DefaultABIInfo::classifyReturnType(RetTy); - } - - // Pack aggregates <= 4 bytes into single VGPR or pair. - uint64_t Size = getContext().getTypeSize(RetTy); - if (Size <= 16) - return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); - - if (Size <= 32) - return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); - - if (Size <= 64) { - llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext()); - return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2)); - } - - if (numRegsForType(RetTy) <= MaxNumRegsForArgsRet) - return ABIArgInfo::getDirect(); - } - } - - // Otherwise just do the default thing. - return DefaultABIInfo::classifyReturnType(RetTy); -} - -/// For kernels all parameters are really passed in a special buffer. It doesn't -/// make sense to pass anything byval, so everything must be direct. -ABIArgInfo AMDGPUABIInfo::classifyKernelArgumentType(QualType Ty) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - // TODO: Can we omit empty structs? - - if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) - Ty = QualType(SeltTy, 0); - - llvm::Type *OrigLTy = CGT.ConvertType(Ty); - llvm::Type *LTy = OrigLTy; - if (getContext().getLangOpts().HIP) { - LTy = coerceKernelArgumentType( - OrigLTy, /*FromAS=*/getContext().getTargetAddressSpace(LangAS::Default), - /*ToAS=*/getContext().getTargetAddressSpace(LangAS::cuda_device)); - } - - // FIXME: Should also use this for OpenCL, but it requires addressing the - // problem of kernels being called. - // - // FIXME: This doesn't apply the optimization of coercing pointers in structs - // to global address space when using byref. This would require implementing a - // new kind of coercion of the in-memory type when for indirect arguments. - if (!getContext().getLangOpts().OpenCL && LTy == OrigLTy && - isAggregateTypeForABI(Ty)) { - return ABIArgInfo::getIndirectAliased( - getContext().getTypeAlignInChars(Ty), - getContext().getTargetAddressSpace(LangAS::opencl_constant), - false /*Realign*/, nullptr /*Padding*/); - } - - // If we set CanBeFlattened to true, CodeGen will expand the struct to its - // individual elements, which confuses the Clover OpenCL backend; therefore we - // have to set it to false here. Other args of getDirect() are just defaults. - return ABIArgInfo::getDirect(LTy, 0, nullptr, false); -} - -ABIArgInfo AMDGPUABIInfo::classifyArgumentType(QualType Ty, - unsigned &NumRegsLeft) const { - assert(NumRegsLeft <= MaxNumRegsForArgsRet && "register estimate underflow"); - - Ty = useFirstFieldIfTransparentUnion(Ty); - - if (isAggregateTypeForABI(Ty)) { - // Records with non-trivial destructors/copy-constructors should not be - // passed by value. - if (auto RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - // Lower single-element structs to just pass a regular value. TODO: We - // could do reasonable-size multiple-element structs too, using getExpand(), - // though watch out for things like bitfields. - if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) - return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); - - if (const RecordType *RT = Ty->getAs()) { - const RecordDecl *RD = RT->getDecl(); - if (RD->hasFlexibleArrayMember()) - return DefaultABIInfo::classifyArgumentType(Ty); - } - - // Pack aggregates <= 8 bytes into single VGPR or pair. - uint64_t Size = getContext().getTypeSize(Ty); - if (Size <= 64) { - unsigned NumRegs = (Size + 31) / 32; - NumRegsLeft -= std::min(NumRegsLeft, NumRegs); - - if (Size <= 16) - return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); - - if (Size <= 32) - return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); - - // XXX: Should this be i64 instead, and should the limit increase? - llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext()); - return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2)); - } - - if (NumRegsLeft > 0) { - unsigned NumRegs = numRegsForType(Ty); - if (NumRegsLeft >= NumRegs) { - NumRegsLeft -= NumRegs; - return ABIArgInfo::getDirect(); - } - } - } - - // Otherwise just do the default thing. - ABIArgInfo ArgInfo = DefaultABIInfo::classifyArgumentType(Ty); - if (!ArgInfo.isIndirect()) { - unsigned NumRegs = numRegsForType(Ty); - NumRegsLeft -= std::min(NumRegs, NumRegsLeft); - } - - return ArgInfo; -} - -class AMDGPUTargetCodeGenInfo : public TargetCodeGenInfo { -public: - AMDGPUTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - - void setFunctionDeclAttributes(const FunctionDecl *FD, llvm::Function *F, - CodeGenModule &CGM) const; - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &M) const override; - unsigned getOpenCLKernelCallingConv() const override; - - llvm::Constant *getNullPointer(const CodeGen::CodeGenModule &CGM, - llvm::PointerType *T, QualType QT) const override; - - LangAS getASTAllocaAddressSpace() const override { - return getLangASFromTargetAS( - getABIInfo().getDataLayout().getAllocaAddrSpace()); - } - LangAS getGlobalVarAddressSpace(CodeGenModule &CGM, - const VarDecl *D) const override; - llvm::SyncScope::ID getLLVMSyncScopeID(const LangOptions &LangOpts, - SyncScope Scope, - llvm::AtomicOrdering Ordering, - llvm::LLVMContext &Ctx) const override; - llvm::Value *createEnqueuedBlockKernel(CodeGenFunction &CGF, - llvm::Function *BlockInvokeFunc, - llvm::Type *BlockTy) const override; - bool shouldEmitStaticExternCAliases() const override; - bool shouldEmitDWARFBitFieldSeparators() const override; - void setCUDAKernelCallingConvention(const FunctionType *&FT) const override; -}; -} - -static bool requiresAMDGPUProtectedVisibility(const Decl *D, - llvm::GlobalValue *GV) { - if (GV->getVisibility() != llvm::GlobalValue::HiddenVisibility) - return false; - - return D->hasAttr() || - (isa(D) && D->hasAttr()) || - (isa(D) && - (D->hasAttr() || D->hasAttr() || - cast(D)->getType()->isCUDADeviceBuiltinSurfaceType() || - cast(D)->getType()->isCUDADeviceBuiltinTextureType())); -} - -void AMDGPUTargetCodeGenInfo::setFunctionDeclAttributes( - const FunctionDecl *FD, llvm::Function *F, CodeGenModule &M) const { - const auto *ReqdWGS = - M.getLangOpts().OpenCL ? FD->getAttr() : nullptr; - const bool IsOpenCLKernel = - M.getLangOpts().OpenCL && FD->hasAttr(); - const bool IsHIPKernel = M.getLangOpts().HIP && FD->hasAttr(); - - const auto *FlatWGS = FD->getAttr(); - if (ReqdWGS || FlatWGS) { - unsigned Min = 0; - unsigned Max = 0; - if (FlatWGS) { - Min = FlatWGS->getMin() - ->EvaluateKnownConstInt(M.getContext()) - .getExtValue(); - Max = FlatWGS->getMax() - ->EvaluateKnownConstInt(M.getContext()) - .getExtValue(); - } - if (ReqdWGS && Min == 0 && Max == 0) - Min = Max = ReqdWGS->getXDim() * ReqdWGS->getYDim() * ReqdWGS->getZDim(); - - if (Min != 0) { - assert(Min <= Max && "Min must be less than or equal Max"); - - std::string AttrVal = llvm::utostr(Min) + "," + llvm::utostr(Max); - F->addFnAttr("amdgpu-flat-work-group-size", AttrVal); - } else - assert(Max == 0 && "Max must be zero"); - } else if (IsOpenCLKernel || IsHIPKernel) { - // By default, restrict the maximum size to a value specified by - // --gpu-max-threads-per-block=n or its default value for HIP. - const unsigned OpenCLDefaultMaxWorkGroupSize = 256; - const unsigned DefaultMaxWorkGroupSize = - IsOpenCLKernel ? OpenCLDefaultMaxWorkGroupSize - : M.getLangOpts().GPUMaxThreadsPerBlock; - std::string AttrVal = - std::string("1,") + llvm::utostr(DefaultMaxWorkGroupSize); - F->addFnAttr("amdgpu-flat-work-group-size", AttrVal); - } - - if (const auto *Attr = FD->getAttr()) { - unsigned Min = - Attr->getMin()->EvaluateKnownConstInt(M.getContext()).getExtValue(); - unsigned Max = Attr->getMax() ? Attr->getMax() - ->EvaluateKnownConstInt(M.getContext()) - .getExtValue() - : 0; - - if (Min != 0) { - assert((Max == 0 || Min <= Max) && "Min must be less than or equal Max"); - - std::string AttrVal = llvm::utostr(Min); - if (Max != 0) - AttrVal = AttrVal + "," + llvm::utostr(Max); - F->addFnAttr("amdgpu-waves-per-eu", AttrVal); - } else - assert(Max == 0 && "Max must be zero"); - } - - if (const auto *Attr = FD->getAttr()) { - unsigned NumSGPR = Attr->getNumSGPR(); - - if (NumSGPR != 0) - F->addFnAttr("amdgpu-num-sgpr", llvm::utostr(NumSGPR)); - } - - if (const auto *Attr = FD->getAttr()) { - uint32_t NumVGPR = Attr->getNumVGPR(); - - if (NumVGPR != 0) - F->addFnAttr("amdgpu-num-vgpr", llvm::utostr(NumVGPR)); - } -} - -void AMDGPUTargetCodeGenInfo::setTargetAttributes( - const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { - if (requiresAMDGPUProtectedVisibility(D, GV)) { - GV->setVisibility(llvm::GlobalValue::ProtectedVisibility); - GV->setDSOLocal(true); - } - - if (GV->isDeclaration()) - return; - - llvm::Function *F = dyn_cast(GV); - if (!F) - return; - - const FunctionDecl *FD = dyn_cast_or_null(D); - if (FD) - setFunctionDeclAttributes(FD, F, M); - - const bool IsHIPKernel = - M.getLangOpts().HIP && FD && FD->hasAttr(); - - // TODO: This should be moved to language specific attributes instead. - if (IsHIPKernel) - F->addFnAttr("uniform-work-group-size", "true"); - - if (M.getContext().getTargetInfo().allowAMDGPUUnsafeFPAtomics()) - F->addFnAttr("amdgpu-unsafe-fp-atomics", "true"); - - if (!getABIInfo().getCodeGenOpts().EmitIEEENaNCompliantInsts) - F->addFnAttr("amdgpu-ieee", "false"); -} - -unsigned AMDGPUTargetCodeGenInfo::getOpenCLKernelCallingConv() const { - return llvm::CallingConv::AMDGPU_KERNEL; -} - -// Currently LLVM assumes null pointers always have value 0, -// which results in incorrectly transformed IR. Therefore, instead of -// emitting null pointers in private and local address spaces, a null -// pointer in generic address space is emitted which is casted to a -// pointer in local or private address space. -llvm::Constant *AMDGPUTargetCodeGenInfo::getNullPointer( - const CodeGen::CodeGenModule &CGM, llvm::PointerType *PT, - QualType QT) const { - if (CGM.getContext().getTargetNullPointerValue(QT) == 0) - return llvm::ConstantPointerNull::get(PT); - - auto &Ctx = CGM.getContext(); - auto NPT = llvm::PointerType::get( - PT->getContext(), Ctx.getTargetAddressSpace(LangAS::opencl_generic)); - return llvm::ConstantExpr::getAddrSpaceCast( - llvm::ConstantPointerNull::get(NPT), PT); -} - -LangAS -AMDGPUTargetCodeGenInfo::getGlobalVarAddressSpace(CodeGenModule &CGM, - const VarDecl *D) const { - assert(!CGM.getLangOpts().OpenCL && - !(CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) && - "Address space agnostic languages only"); - LangAS DefaultGlobalAS = getLangASFromTargetAS( - CGM.getContext().getTargetAddressSpace(LangAS::opencl_global)); - if (!D) - return DefaultGlobalAS; - - LangAS AddrSpace = D->getType().getAddressSpace(); - assert(AddrSpace == LangAS::Default || isTargetAddressSpace(AddrSpace)); - if (AddrSpace != LangAS::Default) - return AddrSpace; - - // Only promote to address space 4 if VarDecl has constant initialization. - if (CGM.isTypeConstant(D->getType(), false, false) && - D->hasConstantInitialization()) { - if (auto ConstAS = CGM.getTarget().getConstantAddressSpace()) - return *ConstAS; - } - return DefaultGlobalAS; -} - -llvm::SyncScope::ID -AMDGPUTargetCodeGenInfo::getLLVMSyncScopeID(const LangOptions &LangOpts, - SyncScope Scope, - llvm::AtomicOrdering Ordering, - llvm::LLVMContext &Ctx) const { - std::string Name; - switch (Scope) { - case SyncScope::HIPSingleThread: - Name = "singlethread"; - break; - case SyncScope::HIPWavefront: - case SyncScope::OpenCLSubGroup: - Name = "wavefront"; - break; - case SyncScope::HIPWorkgroup: - case SyncScope::OpenCLWorkGroup: - Name = "workgroup"; - break; - case SyncScope::HIPAgent: - case SyncScope::OpenCLDevice: - Name = "agent"; - break; - case SyncScope::HIPSystem: - case SyncScope::OpenCLAllSVMDevices: - Name = ""; - break; - } - - if (Ordering != llvm::AtomicOrdering::SequentiallyConsistent) { - if (!Name.empty()) - Name = Twine(Twine(Name) + Twine("-")).str(); - - Name = Twine(Twine(Name) + Twine("one-as")).str(); - } - - return Ctx.getOrInsertSyncScopeID(Name); -} - -bool AMDGPUTargetCodeGenInfo::shouldEmitStaticExternCAliases() const { - return false; -} - -bool AMDGPUTargetCodeGenInfo::shouldEmitDWARFBitFieldSeparators() const { - return true; -} - -void AMDGPUTargetCodeGenInfo::setCUDAKernelCallingConvention( - const FunctionType *&FT) const { - FT = getABIInfo().getContext().adjustFunctionType( - FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel)); -} - -//===----------------------------------------------------------------------===// -// SPARC v8 ABI Implementation. -// Based on the SPARC Compliance Definition version 2.4.1. -// -// Ensures that complex values are passed in registers. -// -namespace { -class SparcV8ABIInfo : public DefaultABIInfo { -public: - SparcV8ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - -private: - ABIArgInfo classifyReturnType(QualType RetTy) const; - void computeInfo(CGFunctionInfo &FI) const override; -}; -} // end anonymous namespace - - -ABIArgInfo -SparcV8ABIInfo::classifyReturnType(QualType Ty) const { - if (Ty->isAnyComplexType()) { - return ABIArgInfo::getDirect(); - } - else { - return DefaultABIInfo::classifyReturnType(Ty); - } -} - -void SparcV8ABIInfo::computeInfo(CGFunctionInfo &FI) const { - - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &Arg : FI.arguments()) - Arg.info = classifyArgumentType(Arg.type); -} - -namespace { -class SparcV8TargetCodeGenInfo : public TargetCodeGenInfo { -public: - SparcV8TargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - - llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - int Offset; - if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType())) - Offset = 12; - else - Offset = 8; - return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, - llvm::ConstantInt::get(CGF.Int32Ty, Offset)); - } - - llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - int Offset; - if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType())) - Offset = -12; - else - Offset = -8; - return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, - llvm::ConstantInt::get(CGF.Int32Ty, Offset)); - } -}; -} // end anonymous namespace - -//===----------------------------------------------------------------------===// -// SPARC v9 ABI Implementation. -// Based on the SPARC Compliance Definition version 2.4.1. -// -// Function arguments a mapped to a nominal "parameter array" and promoted to -// registers depending on their type. Each argument occupies 8 or 16 bytes in -// the array, structs larger than 16 bytes are passed indirectly. -// -// One case requires special care: -// -// struct mixed { -// int i; -// float f; -// }; -// -// When a struct mixed is passed by value, it only occupies 8 bytes in the -// parameter array, but the int is passed in an integer register, and the float -// is passed in a floating point register. This is represented as two arguments -// with the LLVM IR inreg attribute: -// -// declare void f(i32 inreg %i, float inreg %f) -// -// The code generator will only allocate 4 bytes from the parameter array for -// the inreg arguments. All other arguments are allocated a multiple of 8 -// bytes. -// -namespace { -class SparcV9ABIInfo : public ABIInfo { -public: - SparcV9ABIInfo(CodeGenTypes &CGT) : ABIInfo(CGT) {} - -private: - ABIArgInfo classifyType(QualType RetTy, unsigned SizeLimit) const; - void computeInfo(CGFunctionInfo &FI) const override; - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - // Coercion type builder for structs passed in registers. The coercion type - // serves two purposes: - // - // 1. Pad structs to a multiple of 64 bits, so they are passed 'left-aligned' - // in registers. - // 2. Expose aligned floating point elements as first-level elements, so the - // code generator knows to pass them in floating point registers. - // - // We also compute the InReg flag which indicates that the struct contains - // aligned 32-bit floats. - // - struct CoerceBuilder { - llvm::LLVMContext &Context; - const llvm::DataLayout &DL; - SmallVector Elems; - uint64_t Size; - bool InReg; - - CoerceBuilder(llvm::LLVMContext &c, const llvm::DataLayout &dl) - : Context(c), DL(dl), Size(0), InReg(false) {} - - // Pad Elems with integers until Size is ToSize. - void pad(uint64_t ToSize) { - assert(ToSize >= Size && "Cannot remove elements"); - if (ToSize == Size) - return; - - // Finish the current 64-bit word. - uint64_t Aligned = llvm::alignTo(Size, 64); - if (Aligned > Size && Aligned <= ToSize) { - Elems.push_back(llvm::IntegerType::get(Context, Aligned - Size)); - Size = Aligned; - } - - // Add whole 64-bit words. - while (Size + 64 <= ToSize) { - Elems.push_back(llvm::Type::getInt64Ty(Context)); - Size += 64; - } - - // Final in-word padding. - if (Size < ToSize) { - Elems.push_back(llvm::IntegerType::get(Context, ToSize - Size)); - Size = ToSize; - } - } - - // Add a floating point element at Offset. - void addFloat(uint64_t Offset, llvm::Type *Ty, unsigned Bits) { - // Unaligned floats are treated as integers. - if (Offset % Bits) - return; - // The InReg flag is only required if there are any floats < 64 bits. - if (Bits < 64) - InReg = true; - pad(Offset); - Elems.push_back(Ty); - Size = Offset + Bits; - } - - // Add a struct type to the coercion type, starting at Offset (in bits). - void addStruct(uint64_t Offset, llvm::StructType *StrTy) { - const llvm::StructLayout *Layout = DL.getStructLayout(StrTy); - for (unsigned i = 0, e = StrTy->getNumElements(); i != e; ++i) { - llvm::Type *ElemTy = StrTy->getElementType(i); - uint64_t ElemOffset = Offset + Layout->getElementOffsetInBits(i); - switch (ElemTy->getTypeID()) { - case llvm::Type::StructTyID: - addStruct(ElemOffset, cast(ElemTy)); - break; - case llvm::Type::FloatTyID: - addFloat(ElemOffset, ElemTy, 32); - break; - case llvm::Type::DoubleTyID: - addFloat(ElemOffset, ElemTy, 64); - break; - case llvm::Type::FP128TyID: - addFloat(ElemOffset, ElemTy, 128); - break; - case llvm::Type::PointerTyID: - if (ElemOffset % 64 == 0) { - pad(ElemOffset); - Elems.push_back(ElemTy); - Size += 64; - } - break; - default: - break; - } - } - } - - // Check if Ty is a usable substitute for the coercion type. - bool isUsableType(llvm::StructType *Ty) const { - return llvm::ArrayRef(Elems) == Ty->elements(); - } - - // Get the coercion type as a literal struct type. - llvm::Type *getType() const { - if (Elems.size() == 1) - return Elems.front(); - else - return llvm::StructType::get(Context, Elems); - } - }; -}; -} // end anonymous namespace - -ABIArgInfo -SparcV9ABIInfo::classifyType(QualType Ty, unsigned SizeLimit) const { - if (Ty->isVoidType()) - return ABIArgInfo::getIgnore(); - - uint64_t Size = getContext().getTypeSize(Ty); - - // Anything too big to fit in registers is passed with an explicit indirect - // pointer / sret pointer. - if (Size > SizeLimit) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // Integer types smaller than a register are extended. - if (Size < 64 && Ty->isIntegerType()) - return ABIArgInfo::getExtend(Ty); - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() < 64) - return ABIArgInfo::getExtend(Ty); - - // Other non-aggregates go in registers. - if (!isAggregateTypeForABI(Ty)) - return ABIArgInfo::getDirect(); - - // If a C++ object has either a non-trivial copy constructor or a non-trivial - // destructor, it is passed with an explicit indirect pointer / sret pointer. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) - return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); - - // This is a small aggregate type that should be passed in registers. - // Build a coercion type from the LLVM struct type. - llvm::StructType *StrTy = dyn_cast(CGT.ConvertType(Ty)); - if (!StrTy) - return ABIArgInfo::getDirect(); - - CoerceBuilder CB(getVMContext(), getDataLayout()); - CB.addStruct(0, StrTy); - CB.pad(llvm::alignTo(CB.DL.getTypeSizeInBits(StrTy), 64)); - - // Try to use the original type for coercion. - llvm::Type *CoerceTy = CB.isUsableType(StrTy) ? StrTy : CB.getType(); - - if (CB.InReg) - return ABIArgInfo::getDirectInReg(CoerceTy); - else - return ABIArgInfo::getDirect(CoerceTy); -} - -Address SparcV9ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - ABIArgInfo AI = classifyType(Ty, 16 * 8); - llvm::Type *ArgTy = CGT.ConvertType(Ty); - if (AI.canHaveCoerceToType() && !AI.getCoerceToType()) - AI.setCoerceToType(ArgTy); - - CharUnits SlotSize = CharUnits::fromQuantity(8); - - CGBuilderTy &Builder = CGF.Builder; - Address Addr = Address(Builder.CreateLoad(VAListAddr, "ap.cur"), - getVAListElementType(CGF), SlotSize); - llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy); - - auto TypeInfo = getContext().getTypeInfoInChars(Ty); - - Address ArgAddr = Address::invalid(); - CharUnits Stride; - switch (AI.getKind()) { - case ABIArgInfo::Expand: - case ABIArgInfo::CoerceAndExpand: - case ABIArgInfo::InAlloca: - llvm_unreachable("Unsupported ABI kind for va_arg"); - - case ABIArgInfo::Extend: { - Stride = SlotSize; - CharUnits Offset = SlotSize - TypeInfo.Width; - ArgAddr = Builder.CreateConstInBoundsByteGEP(Addr, Offset, "extend"); - break; - } - - case ABIArgInfo::Direct: { - auto AllocSize = getDataLayout().getTypeAllocSize(AI.getCoerceToType()); - Stride = CharUnits::fromQuantity(AllocSize).alignTo(SlotSize); - ArgAddr = Addr; - break; - } - - case ABIArgInfo::Indirect: - case ABIArgInfo::IndirectAliased: - Stride = SlotSize; - ArgAddr = Builder.CreateElementBitCast(Addr, ArgPtrTy, "indirect"); - ArgAddr = Address(Builder.CreateLoad(ArgAddr, "indirect.arg"), ArgTy, - TypeInfo.Align); - break; - - case ABIArgInfo::Ignore: - return Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeInfo.Align); - } - - // Update VAList. - Address NextPtr = Builder.CreateConstInBoundsByteGEP(Addr, Stride, "ap.next"); - Builder.CreateStore(NextPtr.getPointer(), VAListAddr); - - return Builder.CreateElementBitCast(ArgAddr, ArgTy, "arg.addr"); -} - -void SparcV9ABIInfo::computeInfo(CGFunctionInfo &FI) const { - FI.getReturnInfo() = classifyType(FI.getReturnType(), 32 * 8); - for (auto &I : FI.arguments()) - I.info = classifyType(I.type, 16 * 8); -} - -namespace { -class SparcV9TargetCodeGenInfo : public TargetCodeGenInfo { -public: - SparcV9TargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - - int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { - return 14; - } - - bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override; - - llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, - llvm::ConstantInt::get(CGF.Int32Ty, 8)); - } - - llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const override { - return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, - llvm::ConstantInt::get(CGF.Int32Ty, -8)); - } -}; -} // end anonymous namespace - -bool -SparcV9TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, - llvm::Value *Address) const { - // This is calculated from the LLVM and GCC tables and verified - // against gcc output. AFAIK all ABIs use the same encoding. - - CodeGen::CGBuilderTy &Builder = CGF.Builder; - - llvm::IntegerType *i8 = CGF.Int8Ty; - llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4); - llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8); - - // 0-31: the 8-byte general-purpose registers - AssignToArrayRange(Builder, Address, Eight8, 0, 31); - - // 32-63: f0-31, the 4-byte floating-point registers - AssignToArrayRange(Builder, Address, Four8, 32, 63); - - // Y = 64 - // PSR = 65 - // WIM = 66 - // TBR = 67 - // PC = 68 - // NPC = 69 - // FSR = 70 - // CSR = 71 - AssignToArrayRange(Builder, Address, Eight8, 64, 71); - - // 72-87: d0-15, the 8-byte floating-point registers - AssignToArrayRange(Builder, Address, Eight8, 72, 87); - - return false; -} - -// ARC ABI implementation. -namespace { - -class ARCABIInfo : public DefaultABIInfo { - struct CCState { - unsigned FreeRegs; - }; - -public: - using DefaultABIInfo::DefaultABIInfo; - -private: - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - void updateState(const ABIArgInfo &Info, QualType Ty, CCState &State) const { - if (!State.FreeRegs) - return; - if (Info.isIndirect() && Info.getInReg()) - State.FreeRegs--; - else if (Info.isDirect() && Info.getInReg()) { - unsigned sz = (getContext().getTypeSize(Ty) + 31) / 32; - if (sz < State.FreeRegs) - State.FreeRegs -= sz; - else - State.FreeRegs = 0; - } - } - - void computeInfo(CGFunctionInfo &FI) const override { - CCState State; - // ARC uses 8 registers to pass arguments. - State.FreeRegs = 8; - - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - updateState(FI.getReturnInfo(), FI.getReturnType(), State); - for (auto &I : FI.arguments()) { - I.info = classifyArgumentType(I.type, State.FreeRegs); - updateState(I.info, I.type, State); - } - } - - ABIArgInfo getIndirectByRef(QualType Ty, bool HasFreeRegs) const; - ABIArgInfo getIndirectByValue(QualType Ty) const; - ABIArgInfo classifyArgumentType(QualType Ty, uint8_t FreeRegs) const; - ABIArgInfo classifyReturnType(QualType RetTy) const; -}; - -class ARCTargetCodeGenInfo : public TargetCodeGenInfo { -public: - ARCTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} -}; - - -ABIArgInfo ARCABIInfo::getIndirectByRef(QualType Ty, bool HasFreeRegs) const { - return HasFreeRegs ? getNaturalAlignIndirectInReg(Ty) : - getNaturalAlignIndirect(Ty, false); -} - -ABIArgInfo ARCABIInfo::getIndirectByValue(QualType Ty) const { - // Compute the byval alignment. - const unsigned MinABIStackAlignInBytes = 4; - unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8; - return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true, - TypeAlign > MinABIStackAlignInBytes); -} - -Address ARCABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false, - getContext().getTypeInfoInChars(Ty), - CharUnits::fromQuantity(4), true); -} - -ABIArgInfo ARCABIInfo::classifyArgumentType(QualType Ty, - uint8_t FreeRegs) const { - // Handle the generic C++ ABI. - const RecordType *RT = Ty->getAs(); - if (RT) { - CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()); - if (RAA == CGCXXABI::RAA_Indirect) - return getIndirectByRef(Ty, FreeRegs > 0); - - if (RAA == CGCXXABI::RAA_DirectInMemory) - return getIndirectByValue(Ty); - } - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - auto SizeInRegs = llvm::alignTo(getContext().getTypeSize(Ty), 32) / 32; - - if (isAggregateTypeForABI(Ty)) { - // Structures with flexible arrays are always indirect. - if (RT && RT->getDecl()->hasFlexibleArrayMember()) - return getIndirectByValue(Ty); - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - llvm::LLVMContext &LLVMContext = getVMContext(); - - llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext); - SmallVector Elements(SizeInRegs, Int32); - llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements); - - return FreeRegs >= SizeInRegs ? - ABIArgInfo::getDirectInReg(Result) : - ABIArgInfo::getDirect(Result, 0, nullptr, false); - } - - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > 64) - return getIndirectByValue(Ty); - - return isPromotableIntegerTypeForABI(Ty) - ? (FreeRegs >= SizeInRegs ? ABIArgInfo::getExtendInReg(Ty) - : ABIArgInfo::getExtend(Ty)) - : (FreeRegs >= SizeInRegs ? ABIArgInfo::getDirectInReg() - : ABIArgInfo::getDirect()); -} - -ABIArgInfo ARCABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isAnyComplexType()) - return ABIArgInfo::getDirectInReg(); - - // Arguments of size > 4 registers are indirect. - auto RetSize = llvm::alignTo(getContext().getTypeSize(RetTy), 32) / 32; - if (RetSize > 4) - return getIndirectByRef(RetTy, /*HasFreeRegs*/ true); - - return DefaultABIInfo::classifyReturnType(RetTy); -} - -} // End anonymous namespace. - -//===----------------------------------------------------------------------===// -// XCore ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -/// A SmallStringEnc instance is used to build up the TypeString by passing -/// it by reference between functions that append to it. -typedef llvm::SmallString<128> SmallStringEnc; - -/// TypeStringCache caches the meta encodings of Types. -/// -/// The reason for caching TypeStrings is two fold: -/// 1. To cache a type's encoding for later uses; -/// 2. As a means to break recursive member type inclusion. -/// -/// A cache Entry can have a Status of: -/// NonRecursive: The type encoding is not recursive; -/// Recursive: The type encoding is recursive; -/// Incomplete: An incomplete TypeString; -/// IncompleteUsed: An incomplete TypeString that has been used in a -/// Recursive type encoding. -/// -/// A NonRecursive entry will have all of its sub-members expanded as fully -/// as possible. Whilst it may contain types which are recursive, the type -/// itself is not recursive and thus its encoding may be safely used whenever -/// the type is encountered. -/// -/// A Recursive entry will have all of its sub-members expanded as fully as -/// possible. The type itself is recursive and it may contain other types which -/// are recursive. The Recursive encoding must not be used during the expansion -/// of a recursive type's recursive branch. For simplicity the code uses -/// IncompleteCount to reject all usage of Recursive encodings for member types. -/// -/// An Incomplete entry is always a RecordType and only encodes its -/// identifier e.g. "s(S){}". Incomplete 'StubEnc' entries are ephemeral and -/// are placed into the cache during type expansion as a means to identify and -/// handle recursive inclusion of types as sub-members. If there is recursion -/// the entry becomes IncompleteUsed. -/// -/// During the expansion of a RecordType's members: -/// -/// If the cache contains a NonRecursive encoding for the member type, the -/// cached encoding is used; -/// -/// If the cache contains a Recursive encoding for the member type, the -/// cached encoding is 'Swapped' out, as it may be incorrect, and... -/// -/// If the member is a RecordType, an Incomplete encoding is placed into the -/// cache to break potential recursive inclusion of itself as a sub-member; -/// -/// Once a member RecordType has been expanded, its temporary incomplete -/// entry is removed from the cache. If a Recursive encoding was swapped out -/// it is swapped back in; -/// -/// If an incomplete entry is used to expand a sub-member, the incomplete -/// entry is marked as IncompleteUsed. The cache keeps count of how many -/// IncompleteUsed entries it currently contains in IncompleteUsedCount; -/// -/// If a member's encoding is found to be a NonRecursive or Recursive viz: -/// IncompleteUsedCount==0, the member's encoding is added to the cache. -/// Else the member is part of a recursive type and thus the recursion has -/// been exited too soon for the encoding to be correct for the member. -/// -class TypeStringCache { - enum Status {NonRecursive, Recursive, Incomplete, IncompleteUsed}; - struct Entry { - std::string Str; // The encoded TypeString for the type. - enum Status State; // Information about the encoding in 'Str'. - std::string Swapped; // A temporary place holder for a Recursive encoding - // during the expansion of RecordType's members. - }; - std::map Map; - unsigned IncompleteCount; // Number of Incomplete entries in the Map. - unsigned IncompleteUsedCount; // Number of IncompleteUsed entries in the Map. -public: - TypeStringCache() : IncompleteCount(0), IncompleteUsedCount(0) {} - void addIncomplete(const IdentifierInfo *ID, std::string StubEnc); - bool removeIncomplete(const IdentifierInfo *ID); - void addIfComplete(const IdentifierInfo *ID, StringRef Str, - bool IsRecursive); - StringRef lookupStr(const IdentifierInfo *ID); -}; - -/// TypeString encodings for enum & union fields must be order. -/// FieldEncoding is a helper for this ordering process. -class FieldEncoding { - bool HasName; - std::string Enc; -public: - FieldEncoding(bool b, SmallStringEnc &e) : HasName(b), Enc(e.c_str()) {} - StringRef str() { return Enc; } - bool operator<(const FieldEncoding &rhs) const { - if (HasName != rhs.HasName) return HasName; - return Enc < rhs.Enc; - } -}; - -class XCoreABIInfo : public DefaultABIInfo { -public: - XCoreABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -class XCoreTargetCodeGenInfo : public TargetCodeGenInfo { - mutable TypeStringCache TSC; - void emitTargetMD(const Decl *D, llvm::GlobalValue *GV, - const CodeGen::CodeGenModule &M) const; - -public: - XCoreTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - void emitTargetMetadata(CodeGen::CodeGenModule &CGM, - const llvm::MapVector - &MangledDeclNames) const override; -}; - -} // End anonymous namespace. - -// TODO: this implementation is likely now redundant with the default -// EmitVAArg. -Address XCoreABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - CGBuilderTy &Builder = CGF.Builder; - - // Get the VAList. - CharUnits SlotSize = CharUnits::fromQuantity(4); - Address AP = Address(Builder.CreateLoad(VAListAddr), - getVAListElementType(CGF), SlotSize); - - // Handle the argument. - ABIArgInfo AI = classifyArgumentType(Ty); - CharUnits TypeAlign = getContext().getTypeAlignInChars(Ty); - llvm::Type *ArgTy = CGT.ConvertType(Ty); - if (AI.canHaveCoerceToType() && !AI.getCoerceToType()) - AI.setCoerceToType(ArgTy); - llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy); - - Address Val = Address::invalid(); - CharUnits ArgSize = CharUnits::Zero(); - switch (AI.getKind()) { - case ABIArgInfo::Expand: - case ABIArgInfo::CoerceAndExpand: - case ABIArgInfo::InAlloca: - llvm_unreachable("Unsupported ABI kind for va_arg"); - case ABIArgInfo::Ignore: - Val = Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeAlign); - ArgSize = CharUnits::Zero(); - break; - case ABIArgInfo::Extend: - case ABIArgInfo::Direct: - Val = Builder.CreateElementBitCast(AP, ArgTy); - ArgSize = CharUnits::fromQuantity( - getDataLayout().getTypeAllocSize(AI.getCoerceToType())); - ArgSize = ArgSize.alignTo(SlotSize); - break; - case ABIArgInfo::Indirect: - case ABIArgInfo::IndirectAliased: - Val = Builder.CreateElementBitCast(AP, ArgPtrTy); - Val = Address(Builder.CreateLoad(Val), ArgTy, TypeAlign); - ArgSize = SlotSize; - break; - } - - // Increment the VAList. - if (!ArgSize.isZero()) { - Address APN = Builder.CreateConstInBoundsByteGEP(AP, ArgSize); - Builder.CreateStore(APN.getPointer(), VAListAddr); - } - - return Val; -} - -/// During the expansion of a RecordType, an incomplete TypeString is placed -/// into the cache as a means to identify and break recursion. -/// If there is a Recursive encoding in the cache, it is swapped out and will -/// be reinserted by removeIncomplete(). -/// All other types of encoding should have been used rather than arriving here. -void TypeStringCache::addIncomplete(const IdentifierInfo *ID, - std::string StubEnc) { - if (!ID) - return; - Entry &E = Map[ID]; - assert( (E.Str.empty() || E.State == Recursive) && - "Incorrectly use of addIncomplete"); - assert(!StubEnc.empty() && "Passing an empty string to addIncomplete()"); - E.Swapped.swap(E.Str); // swap out the Recursive - E.Str.swap(StubEnc); - E.State = Incomplete; - ++IncompleteCount; -} - -/// Once the RecordType has been expanded, the temporary incomplete TypeString -/// must be removed from the cache. -/// If a Recursive was swapped out by addIncomplete(), it will be replaced. -/// Returns true if the RecordType was defined recursively. -bool TypeStringCache::removeIncomplete(const IdentifierInfo *ID) { - if (!ID) - return false; - auto I = Map.find(ID); - assert(I != Map.end() && "Entry not present"); - Entry &E = I->second; - assert( (E.State == Incomplete || - E.State == IncompleteUsed) && - "Entry must be an incomplete type"); - bool IsRecursive = false; - if (E.State == IncompleteUsed) { - // We made use of our Incomplete encoding, thus we are recursive. - IsRecursive = true; - --IncompleteUsedCount; - } - if (E.Swapped.empty()) - Map.erase(I); - else { - // Swap the Recursive back. - E.Swapped.swap(E.Str); - E.Swapped.clear(); - E.State = Recursive; - } - --IncompleteCount; - return IsRecursive; -} - -/// Add the encoded TypeString to the cache only if it is NonRecursive or -/// Recursive (viz: all sub-members were expanded as fully as possible). -void TypeStringCache::addIfComplete(const IdentifierInfo *ID, StringRef Str, - bool IsRecursive) { - if (!ID || IncompleteUsedCount) - return; // No key or it is an incomplete sub-type so don't add. - Entry &E = Map[ID]; - if (IsRecursive && !E.Str.empty()) { - assert(E.State==Recursive && E.Str.size() == Str.size() && - "This is not the same Recursive entry"); - // The parent container was not recursive after all, so we could have used - // this Recursive sub-member entry after all, but we assumed the worse when - // we started viz: IncompleteCount!=0. - return; - } - assert(E.Str.empty() && "Entry already present"); - E.Str = Str.str(); - E.State = IsRecursive? Recursive : NonRecursive; -} - -/// Return a cached TypeString encoding for the ID. If there isn't one, or we -/// are recursively expanding a type (IncompleteCount != 0) and the cached -/// encoding is Recursive, return an empty StringRef. -StringRef TypeStringCache::lookupStr(const IdentifierInfo *ID) { - if (!ID) - return StringRef(); // We have no key. - auto I = Map.find(ID); - if (I == Map.end()) - return StringRef(); // We have no encoding. - Entry &E = I->second; - if (E.State == Recursive && IncompleteCount) - return StringRef(); // We don't use Recursive encodings for member types. - - if (E.State == Incomplete) { - // The incomplete type is being used to break out of recursion. - E.State = IncompleteUsed; - ++IncompleteUsedCount; - } - return E.Str; -} - -/// The XCore ABI includes a type information section that communicates symbol -/// type information to the linker. The linker uses this information to verify -/// safety/correctness of things such as array bound and pointers et al. -/// The ABI only requires C (and XC) language modules to emit TypeStrings. -/// This type information (TypeString) is emitted into meta data for all global -/// symbols: definitions, declarations, functions & variables. -/// -/// The TypeString carries type, qualifier, name, size & value details. -/// Please see 'Tools Development Guide' section 2.16.2 for format details: -/// https://www.xmos.com/download/public/Tools-Development-Guide%28X9114A%29.pdf -/// The output is tested by test/CodeGen/xcore-stringtype.c. -/// -static bool getTypeString(SmallStringEnc &Enc, const Decl *D, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC); - -/// XCore uses emitTargetMD to emit TypeString metadata for global symbols. -void XCoreTargetCodeGenInfo::emitTargetMD( - const Decl *D, llvm::GlobalValue *GV, - const CodeGen::CodeGenModule &CGM) const { - SmallStringEnc Enc; - if (getTypeString(Enc, D, CGM, TSC)) { - llvm::LLVMContext &Ctx = CGM.getModule().getContext(); - llvm::Metadata *MDVals[] = {llvm::ConstantAsMetadata::get(GV), - llvm::MDString::get(Ctx, Enc.str())}; - llvm::NamedMDNode *MD = - CGM.getModule().getOrInsertNamedMetadata("xcore.typestrings"); - MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); - } -} - -void XCoreTargetCodeGenInfo::emitTargetMetadata( - CodeGen::CodeGenModule &CGM, - const llvm::MapVector &MangledDeclNames) const { - // Warning, new MangledDeclNames may be appended within this loop. - // We rely on MapVector insertions adding new elements to the end - // of the container. - for (unsigned I = 0; I != MangledDeclNames.size(); ++I) { - auto Val = *(MangledDeclNames.begin() + I); - llvm::GlobalValue *GV = CGM.GetGlobalValue(Val.second); - if (GV) { - const Decl *D = Val.first.getDecl()->getMostRecentDecl(); - emitTargetMD(D, GV, CGM); - } - } -} - -//===----------------------------------------------------------------------===// -// Base ABI and target codegen info implementation common between SPIR and -// SPIR-V. -//===----------------------------------------------------------------------===// - -namespace { -class CommonSPIRABIInfo : public DefaultABIInfo { -public: - CommonSPIRABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) { setCCs(); } - -private: - void setCCs(); -}; - -class SPIRVABIInfo : public CommonSPIRABIInfo { -public: - SPIRVABIInfo(CodeGenTypes &CGT) : CommonSPIRABIInfo(CGT) {} - void computeInfo(CGFunctionInfo &FI) const override; - -private: - ABIArgInfo classifyKernelArgumentType(QualType Ty) const; -}; -} // end anonymous namespace -namespace { -class CommonSPIRTargetCodeGenInfo : public TargetCodeGenInfo { -public: - CommonSPIRTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - CommonSPIRTargetCodeGenInfo(std::unique_ptr ABIInfo) - : TargetCodeGenInfo(std::move(ABIInfo)) {} - - LangAS getASTAllocaAddressSpace() const override { - return getLangASFromTargetAS( - getABIInfo().getDataLayout().getAllocaAddrSpace()); - } - - unsigned getOpenCLKernelCallingConv() const override; - llvm::Type *getOpenCLType(CodeGenModule &CGM, const Type *T) const override; -}; -class SPIRVTargetCodeGenInfo : public CommonSPIRTargetCodeGenInfo { -public: - SPIRVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) - : CommonSPIRTargetCodeGenInfo(std::make_unique(CGT)) {} - void setCUDAKernelCallingConvention(const FunctionType *&FT) const override; -}; -} // End anonymous namespace. - -void CommonSPIRABIInfo::setCCs() { - assert(getRuntimeCC() == llvm::CallingConv::C); - RuntimeCC = llvm::CallingConv::SPIR_FUNC; -} - -ABIArgInfo SPIRVABIInfo::classifyKernelArgumentType(QualType Ty) const { - if (getContext().getLangOpts().CUDAIsDevice) { - // Coerce pointer arguments with default address space to CrossWorkGroup - // pointers for HIPSPV/CUDASPV. When the language mode is HIP/CUDA, the - // SPIRTargetInfo maps cuda_device to SPIR-V's CrossWorkGroup address space. - llvm::Type *LTy = CGT.ConvertType(Ty); - auto DefaultAS = getContext().getTargetAddressSpace(LangAS::Default); - auto GlobalAS = getContext().getTargetAddressSpace(LangAS::cuda_device); - auto *PtrTy = llvm::dyn_cast(LTy); - if (PtrTy && PtrTy->getAddressSpace() == DefaultAS) { - LTy = llvm::PointerType::get(PtrTy->getContext(), GlobalAS); - return ABIArgInfo::getDirect(LTy, 0, nullptr, false); - } - - // Force copying aggregate type in kernel arguments by value when - // compiling CUDA targeting SPIR-V. This is required for the object - // copied to be valid on the device. - // This behavior follows the CUDA spec - // https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#global-function-argument-processing, - // and matches the NVPTX implementation. - if (isAggregateTypeForABI(Ty)) - return getNaturalAlignIndirect(Ty, /* byval */ true); - } - return classifyArgumentType(Ty); -} - -void SPIRVABIInfo::computeInfo(CGFunctionInfo &FI) const { - // The logic is same as in DefaultABIInfo with an exception on the kernel - // arguments handling. - llvm::CallingConv::ID CC = FI.getCallingConvention(); - - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - - for (auto &I : FI.arguments()) { - if (CC == llvm::CallingConv::SPIR_KERNEL) { - I.info = classifyKernelArgumentType(I.type); - } else { - I.info = classifyArgumentType(I.type); - } - } -} - -namespace clang { -namespace CodeGen { -void computeSPIRKernelABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI) { - if (CGM.getTarget().getTriple().isSPIRV()) - SPIRVABIInfo(CGM.getTypes()).computeInfo(FI); - else - CommonSPIRABIInfo(CGM.getTypes()).computeInfo(FI); -} -} -} - -unsigned CommonSPIRTargetCodeGenInfo::getOpenCLKernelCallingConv() const { - return llvm::CallingConv::SPIR_KERNEL; -} - -void SPIRVTargetCodeGenInfo::setCUDAKernelCallingConvention( - const FunctionType *&FT) const { - // Convert HIP kernels to SPIR-V kernels. - if (getABIInfo().getContext().getLangOpts().HIP) { - FT = getABIInfo().getContext().adjustFunctionType( - FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel)); - return; - } -} - -static bool appendType(SmallStringEnc &Enc, QualType QType, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC); - -/// Helper function for appendRecordType(). -/// Builds a SmallVector containing the encoded field types in declaration -/// order. -static bool extractFieldType(SmallVectorImpl &FE, - const RecordDecl *RD, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC) { - for (const auto *Field : RD->fields()) { - SmallStringEnc Enc; - Enc += "m("; - Enc += Field->getName(); - Enc += "){"; - if (Field->isBitField()) { - Enc += "b("; - llvm::raw_svector_ostream OS(Enc); - OS << Field->getBitWidthValue(CGM.getContext()); - Enc += ':'; - } - if (!appendType(Enc, Field->getType(), CGM, TSC)) - return false; - if (Field->isBitField()) - Enc += ')'; - Enc += '}'; - FE.emplace_back(!Field->getName().empty(), Enc); - } - return true; -} - -/// Appends structure and union types to Enc and adds encoding to cache. -/// Recursively calls appendType (via extractFieldType) for each field. -/// Union types have their fields ordered according to the ABI. -static bool appendRecordType(SmallStringEnc &Enc, const RecordType *RT, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC, const IdentifierInfo *ID) { - // Append the cached TypeString if we have one. - StringRef TypeString = TSC.lookupStr(ID); - if (!TypeString.empty()) { - Enc += TypeString; - return true; - } - - // Start to emit an incomplete TypeString. - size_t Start = Enc.size(); - Enc += (RT->isUnionType()? 'u' : 's'); - Enc += '('; - if (ID) - Enc += ID->getName(); - Enc += "){"; - - // We collect all encoded fields and order as necessary. - bool IsRecursive = false; - const RecordDecl *RD = RT->getDecl()->getDefinition(); - if (RD && !RD->field_empty()) { - // An incomplete TypeString stub is placed in the cache for this RecordType - // so that recursive calls to this RecordType will use it whilst building a - // complete TypeString for this RecordType. - SmallVector FE; - std::string StubEnc(Enc.substr(Start).str()); - StubEnc += '}'; // StubEnc now holds a valid incomplete TypeString. - TSC.addIncomplete(ID, std::move(StubEnc)); - if (!extractFieldType(FE, RD, CGM, TSC)) { - (void) TSC.removeIncomplete(ID); - return false; - } - IsRecursive = TSC.removeIncomplete(ID); - // The ABI requires unions to be sorted but not structures. - // See FieldEncoding::operator< for sort algorithm. - if (RT->isUnionType()) - llvm::sort(FE); - // We can now complete the TypeString. - unsigned E = FE.size(); - for (unsigned I = 0; I != E; ++I) { - if (I) - Enc += ','; - Enc += FE[I].str(); - } - } - Enc += '}'; - TSC.addIfComplete(ID, Enc.substr(Start), IsRecursive); - return true; -} - -/// Appends enum types to Enc and adds the encoding to the cache. -static bool appendEnumType(SmallStringEnc &Enc, const EnumType *ET, - TypeStringCache &TSC, - const IdentifierInfo *ID) { - // Append the cached TypeString if we have one. - StringRef TypeString = TSC.lookupStr(ID); - if (!TypeString.empty()) { - Enc += TypeString; - return true; - } - - size_t Start = Enc.size(); - Enc += "e("; - if (ID) - Enc += ID->getName(); - Enc += "){"; - - // We collect all encoded enumerations and order them alphanumerically. - if (const EnumDecl *ED = ET->getDecl()->getDefinition()) { - SmallVector FE; - for (auto I = ED->enumerator_begin(), E = ED->enumerator_end(); I != E; - ++I) { - SmallStringEnc EnumEnc; - EnumEnc += "m("; - EnumEnc += I->getName(); - EnumEnc += "){"; - I->getInitVal().toString(EnumEnc); - EnumEnc += '}'; - FE.push_back(FieldEncoding(!I->getName().empty(), EnumEnc)); - } - llvm::sort(FE); - unsigned E = FE.size(); - for (unsigned I = 0; I != E; ++I) { - if (I) - Enc += ','; - Enc += FE[I].str(); - } - } - Enc += '}'; - TSC.addIfComplete(ID, Enc.substr(Start), false); - return true; -} - -/// Appends type's qualifier to Enc. -/// This is done prior to appending the type's encoding. -static void appendQualifier(SmallStringEnc &Enc, QualType QT) { - // Qualifiers are emitted in alphabetical order. - static const char *const Table[]={"","c:","r:","cr:","v:","cv:","rv:","crv:"}; - int Lookup = 0; - if (QT.isConstQualified()) - Lookup += 1<<0; - if (QT.isRestrictQualified()) - Lookup += 1<<1; - if (QT.isVolatileQualified()) - Lookup += 1<<2; - Enc += Table[Lookup]; -} - -/// Appends built-in types to Enc. -static bool appendBuiltinType(SmallStringEnc &Enc, const BuiltinType *BT) { - const char *EncType; - switch (BT->getKind()) { - case BuiltinType::Void: - EncType = "0"; - break; - case BuiltinType::Bool: - EncType = "b"; - break; - case BuiltinType::Char_U: - EncType = "uc"; - break; - case BuiltinType::UChar: - EncType = "uc"; - break; - case BuiltinType::SChar: - EncType = "sc"; - break; - case BuiltinType::UShort: - EncType = "us"; - break; - case BuiltinType::Short: - EncType = "ss"; - break; - case BuiltinType::UInt: - EncType = "ui"; - break; - case BuiltinType::Int: - EncType = "si"; - break; - case BuiltinType::ULong: - EncType = "ul"; - break; - case BuiltinType::Long: - EncType = "sl"; - break; - case BuiltinType::ULongLong: - EncType = "ull"; - break; - case BuiltinType::LongLong: - EncType = "sll"; - break; - case BuiltinType::Float: - EncType = "ft"; - break; - case BuiltinType::Double: - EncType = "d"; - break; - case BuiltinType::LongDouble: - EncType = "ld"; - break; - default: - return false; - } - Enc += EncType; - return true; -} - -/// Appends a pointer encoding to Enc before calling appendType for the pointee. -static bool appendPointerType(SmallStringEnc &Enc, const PointerType *PT, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC) { - Enc += "p("; - if (!appendType(Enc, PT->getPointeeType(), CGM, TSC)) - return false; - Enc += ')'; - return true; -} - -/// Appends array encoding to Enc before calling appendType for the element. -static bool appendArrayType(SmallStringEnc &Enc, QualType QT, - const ArrayType *AT, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC, StringRef NoSizeEnc) { - if (AT->getSizeModifier() != ArrayType::Normal) - return false; - Enc += "a("; - if (const ConstantArrayType *CAT = dyn_cast(AT)) - CAT->getSize().toStringUnsigned(Enc); - else - Enc += NoSizeEnc; // Global arrays use "*", otherwise it is "". - Enc += ':'; - // The Qualifiers should be attached to the type rather than the array. - appendQualifier(Enc, QT); - if (!appendType(Enc, AT->getElementType(), CGM, TSC)) - return false; - Enc += ')'; - return true; -} - -/// Appends a function encoding to Enc, calling appendType for the return type -/// and the arguments. -static bool appendFunctionType(SmallStringEnc &Enc, const FunctionType *FT, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC) { - Enc += "f{"; - if (!appendType(Enc, FT->getReturnType(), CGM, TSC)) - return false; - Enc += "}("; - if (const FunctionProtoType *FPT = FT->getAs()) { - // N.B. we are only interested in the adjusted param types. - auto I = FPT->param_type_begin(); - auto E = FPT->param_type_end(); - if (I != E) { - do { - if (!appendType(Enc, *I, CGM, TSC)) - return false; - ++I; - if (I != E) - Enc += ','; - } while (I != E); - if (FPT->isVariadic()) - Enc += ",va"; - } else { - if (FPT->isVariadic()) - Enc += "va"; - else - Enc += '0'; - } - } - Enc += ')'; - return true; -} - -/// Handles the type's qualifier before dispatching a call to handle specific -/// type encodings. -static bool appendType(SmallStringEnc &Enc, QualType QType, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC) { - - QualType QT = QType.getCanonicalType(); - - if (const ArrayType *AT = QT->getAsArrayTypeUnsafe()) - // The Qualifiers should be attached to the type rather than the array. - // Thus we don't call appendQualifier() here. - return appendArrayType(Enc, QT, AT, CGM, TSC, ""); - - appendQualifier(Enc, QT); - - if (const BuiltinType *BT = QT->getAs()) - return appendBuiltinType(Enc, BT); - - if (const PointerType *PT = QT->getAs()) - return appendPointerType(Enc, PT, CGM, TSC); - - if (const EnumType *ET = QT->getAs()) - return appendEnumType(Enc, ET, TSC, QT.getBaseTypeIdentifier()); - - if (const RecordType *RT = QT->getAsStructureType()) - return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier()); - - if (const RecordType *RT = QT->getAsUnionType()) - return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier()); - - if (const FunctionType *FT = QT->getAs()) - return appendFunctionType(Enc, FT, CGM, TSC); - - return false; -} - -static bool getTypeString(SmallStringEnc &Enc, const Decl *D, - const CodeGen::CodeGenModule &CGM, - TypeStringCache &TSC) { - if (!D) - return false; - - if (const FunctionDecl *FD = dyn_cast(D)) { - if (FD->getLanguageLinkage() != CLanguageLinkage) - return false; - return appendType(Enc, FD->getType(), CGM, TSC); - } - - if (const VarDecl *VD = dyn_cast(D)) { - if (VD->getLanguageLinkage() != CLanguageLinkage) - return false; - QualType QT = VD->getType().getCanonicalType(); - if (const ArrayType *AT = QT->getAsArrayTypeUnsafe()) { - // Global ArrayTypes are given a size of '*' if the size is unknown. - // The Qualifiers should be attached to the type rather than the array. - // Thus we don't call appendQualifier() here. - return appendArrayType(Enc, QT, AT, CGM, TSC, "*"); - } - return appendType(Enc, QT, CGM, TSC); - } - return false; -} - -/// Construct a SPIR-V target extension type for the given OpenCL image type. -static llvm::Type *getSPIRVImageType(llvm::LLVMContext &Ctx, StringRef BaseType, - StringRef OpenCLName, - unsigned AccessQualifier) { - // These parameters compare to the operands of OpTypeImage (see - // https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpTypeImage - // for more details). The first 6 integer parameters all default to 0, and - // will be changed to 1 only for the image type(s) that set the parameter to - // one. The 7th integer parameter is the access qualifier, which is tacked on - // at the end. - SmallVector IntParams = {0, 0, 0, 0, 0, 0}; - - // Choose the dimension of the image--this corresponds to the Dim enum in - // SPIR-V (first integer parameter of OpTypeImage). - if (OpenCLName.startswith("image2d")) - IntParams[0] = 1; // 1D - else if (OpenCLName.startswith("image3d")) - IntParams[0] = 2; // 2D - else if (OpenCLName == "image1d_buffer") - IntParams[0] = 5; // Buffer - else - assert(OpenCLName.startswith("image1d") && "Unknown image type"); - - // Set the other integer parameters of OpTypeImage if necessary. Note that the - // OpenCL image types don't provide any information for the Sampled or - // Image Format parameters. - if (OpenCLName.contains("_depth")) - IntParams[1] = 1; - if (OpenCLName.contains("_array")) - IntParams[2] = 1; - if (OpenCLName.contains("_msaa")) - IntParams[3] = 1; - - // Access qualifier - IntParams.push_back(AccessQualifier); - - return llvm::TargetExtType::get(Ctx, BaseType, {llvm::Type::getVoidTy(Ctx)}, - IntParams); -} - -llvm::Type *CommonSPIRTargetCodeGenInfo::getOpenCLType(CodeGenModule &CGM, - const Type *Ty) const { - llvm::LLVMContext &Ctx = CGM.getLLVMContext(); - if (auto *PipeTy = dyn_cast(Ty)) - return llvm::TargetExtType::get(Ctx, "spirv.Pipe", {}, - {!PipeTy->isReadOnly()}); - if (auto *BuiltinTy = dyn_cast(Ty)) { - enum AccessQualifier : unsigned { AQ_ro = 0, AQ_wo = 1, AQ_rw = 2 }; - switch (BuiltinTy->getKind()) { -#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ - case BuiltinType::Id: \ - return getSPIRVImageType(Ctx, "spirv.Image", #ImgType, AQ_##Suffix); -#include "clang/Basic/OpenCLImageTypes.def" - case BuiltinType::OCLSampler: - return llvm::TargetExtType::get(Ctx, "spirv.Sampler"); - case BuiltinType::OCLEvent: - return llvm::TargetExtType::get(Ctx, "spirv.Event"); - case BuiltinType::OCLClkEvent: - return llvm::TargetExtType::get(Ctx, "spirv.DeviceEvent"); - case BuiltinType::OCLQueue: - return llvm::TargetExtType::get(Ctx, "spirv.Queue"); - case BuiltinType::OCLReserveID: - return llvm::TargetExtType::get(Ctx, "spirv.ReserveId"); -#define INTEL_SUBGROUP_AVC_TYPE(Name, Id) \ - case BuiltinType::OCLIntelSubgroupAVC##Id: \ - return llvm::TargetExtType::get(Ctx, "spirv.Avc" #Id "INTEL"); -#include "clang/Basic/OpenCLExtensionTypes.def" - default: - return nullptr; - } - } - - return nullptr; -} -//===----------------------------------------------------------------------===// -// RISC-V ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { -class RISCVABIInfo : public DefaultABIInfo { -private: - // Size of the integer ('x') registers in bits. - unsigned XLen; - // Size of the floating point ('f') registers in bits. Note that the target - // ISA might have a wider FLen than the selected ABI (e.g. an RV32IF target - // with soft float ABI has FLen==0). - unsigned FLen; - static const int NumArgGPRs = 8; - static const int NumArgFPRs = 8; - bool detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff, - llvm::Type *&Field1Ty, - CharUnits &Field1Off, - llvm::Type *&Field2Ty, - CharUnits &Field2Off) const; - -public: - RISCVABIInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen, unsigned FLen) - : DefaultABIInfo(CGT), XLen(XLen), FLen(FLen) {} - - // DefaultABIInfo's classifyReturnType and classifyArgumentType are - // non-virtual, but computeInfo is virtual, so we overload it. - void computeInfo(CGFunctionInfo &FI) const override; - - ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &ArgGPRsLeft, - int &ArgFPRsLeft) const; - ABIArgInfo classifyReturnType(QualType RetTy) const; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - ABIArgInfo extendType(QualType Ty) const; - - bool detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty, - CharUnits &Field1Off, llvm::Type *&Field2Ty, - CharUnits &Field2Off, int &NeededArgGPRs, - int &NeededArgFPRs) const; - ABIArgInfo coerceAndExpandFPCCEligibleStruct(llvm::Type *Field1Ty, - CharUnits Field1Off, - llvm::Type *Field2Ty, - CharUnits Field2Off) const; - - ABIArgInfo coerceVLSVector(QualType Ty) const; -}; -} // end anonymous namespace - -void RISCVABIInfo::computeInfo(CGFunctionInfo &FI) const { - QualType RetTy = FI.getReturnType(); - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(RetTy); - - // IsRetIndirect is true if classifyArgumentType indicated the value should - // be passed indirect, or if the type size is a scalar greater than 2*XLen - // and not a complex type with elements <= FLen. e.g. fp128 is passed direct - // in LLVM IR, relying on the backend lowering code to rewrite the argument - // list and pass indirectly on RV32. - bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect; - if (!IsRetIndirect && RetTy->isScalarType() && - getContext().getTypeSize(RetTy) > (2 * XLen)) { - if (RetTy->isComplexType() && FLen) { - QualType EltTy = RetTy->castAs()->getElementType(); - IsRetIndirect = getContext().getTypeSize(EltTy) > FLen; - } else { - // This is a normal scalar > 2*XLen, such as fp128 on RV32. - IsRetIndirect = true; - } - } - - int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs; - int ArgFPRsLeft = FLen ? NumArgFPRs : 0; - int NumFixedArgs = FI.getNumRequiredArgs(); - - int ArgNum = 0; - for (auto &ArgInfo : FI.arguments()) { - bool IsFixed = ArgNum < NumFixedArgs; - ArgInfo.info = - classifyArgumentType(ArgInfo.type, IsFixed, ArgGPRsLeft, ArgFPRsLeft); - ArgNum++; - } -} - -// Returns true if the struct is a potential candidate for the floating point -// calling convention. If this function returns true, the caller is -// responsible for checking that if there is only a single field then that -// field is a float. -bool RISCVABIInfo::detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff, - llvm::Type *&Field1Ty, - CharUnits &Field1Off, - llvm::Type *&Field2Ty, - CharUnits &Field2Off) const { - bool IsInt = Ty->isIntegralOrEnumerationType(); - bool IsFloat = Ty->isRealFloatingType(); - - if (IsInt || IsFloat) { - uint64_t Size = getContext().getTypeSize(Ty); - if (IsInt && Size > XLen) - return false; - // Can't be eligible if larger than the FP registers. Handling of half - // precision values has been specified in the ABI, so don't block those. - if (IsFloat && Size > FLen) - return false; - // Can't be eligible if an integer type was already found (int+int pairs - // are not eligible). - if (IsInt && Field1Ty && Field1Ty->isIntegerTy()) - return false; - if (!Field1Ty) { - Field1Ty = CGT.ConvertType(Ty); - Field1Off = CurOff; - return true; - } - if (!Field2Ty) { - Field2Ty = CGT.ConvertType(Ty); - Field2Off = CurOff; - return true; - } - return false; - } - - if (auto CTy = Ty->getAs()) { - if (Field1Ty) - return false; - QualType EltTy = CTy->getElementType(); - if (getContext().getTypeSize(EltTy) > FLen) - return false; - Field1Ty = CGT.ConvertType(EltTy); - Field1Off = CurOff; - Field2Ty = Field1Ty; - Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy); - return true; - } - - if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) { - uint64_t ArraySize = ATy->getSize().getZExtValue(); - QualType EltTy = ATy->getElementType(); - CharUnits EltSize = getContext().getTypeSizeInChars(EltTy); - for (uint64_t i = 0; i < ArraySize; ++i) { - bool Ret = detectFPCCEligibleStructHelper(EltTy, CurOff, Field1Ty, - Field1Off, Field2Ty, Field2Off); - if (!Ret) - return false; - CurOff += EltSize; - } - return true; - } - - if (const auto *RTy = Ty->getAs()) { - // Structures with either a non-trivial destructor or a non-trivial - // copy constructor are not eligible for the FP calling convention. - if (getRecordArgABI(Ty, CGT.getCXXABI())) - return false; - if (isEmptyRecord(getContext(), Ty, true)) - return true; - const RecordDecl *RD = RTy->getDecl(); - // Unions aren't eligible unless they're empty (which is caught above). - if (RD->isUnion()) - return false; - const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - for (const CXXBaseSpecifier &B : CXXRD->bases()) { - const auto *BDecl = - cast(B.getType()->castAs()->getDecl()); - CharUnits BaseOff = Layout.getBaseClassOffset(BDecl); - bool Ret = detectFPCCEligibleStructHelper(B.getType(), CurOff + BaseOff, - Field1Ty, Field1Off, Field2Ty, - Field2Off); - if (!Ret) - return false; - } - } - int ZeroWidthBitFieldCount = 0; - for (const FieldDecl *FD : RD->fields()) { - uint64_t FieldOffInBits = Layout.getFieldOffset(FD->getFieldIndex()); - QualType QTy = FD->getType(); - if (FD->isBitField()) { - unsigned BitWidth = FD->getBitWidthValue(getContext()); - // Allow a bitfield with a type greater than XLen as long as the - // bitwidth is XLen or less. - if (getContext().getTypeSize(QTy) > XLen && BitWidth <= XLen) - QTy = getContext().getIntTypeForBitwidth(XLen, false); - if (BitWidth == 0) { - ZeroWidthBitFieldCount++; - continue; - } - } - - bool Ret = detectFPCCEligibleStructHelper( - QTy, CurOff + getContext().toCharUnitsFromBits(FieldOffInBits), - Field1Ty, Field1Off, Field2Ty, Field2Off); - if (!Ret) - return false; - - // As a quirk of the ABI, zero-width bitfields aren't ignored for fp+fp - // or int+fp structs, but are ignored for a struct with an fp field and - // any number of zero-width bitfields. - if (Field2Ty && ZeroWidthBitFieldCount > 0) - return false; - } - return Field1Ty != nullptr; - } - - return false; -} - -// Determine if a struct is eligible for passing according to the floating -// point calling convention (i.e., when flattened it contains a single fp -// value, fp+fp, or int+fp of appropriate size). If so, NeededArgFPRs and -// NeededArgGPRs are incremented appropriately. -bool RISCVABIInfo::detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty, - CharUnits &Field1Off, - llvm::Type *&Field2Ty, - CharUnits &Field2Off, - int &NeededArgGPRs, - int &NeededArgFPRs) const { - Field1Ty = nullptr; - Field2Ty = nullptr; - NeededArgGPRs = 0; - NeededArgFPRs = 0; - bool IsCandidate = detectFPCCEligibleStructHelper( - Ty, CharUnits::Zero(), Field1Ty, Field1Off, Field2Ty, Field2Off); - // Not really a candidate if we have a single int but no float. - if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy()) - return false; - if (!IsCandidate) - return false; - if (Field1Ty && Field1Ty->isFloatingPointTy()) - NeededArgFPRs++; - else if (Field1Ty) - NeededArgGPRs++; - if (Field2Ty && Field2Ty->isFloatingPointTy()) - NeededArgFPRs++; - else if (Field2Ty) - NeededArgGPRs++; - return true; -} - -// Call getCoerceAndExpand for the two-element flattened struct described by -// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an -// appropriate coerceToType and unpaddedCoerceToType. -ABIArgInfo RISCVABIInfo::coerceAndExpandFPCCEligibleStruct( - llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty, - CharUnits Field2Off) const { - SmallVector CoerceElts; - SmallVector UnpaddedCoerceElts; - if (!Field1Off.isZero()) - CoerceElts.push_back(llvm::ArrayType::get( - llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity())); - - CoerceElts.push_back(Field1Ty); - UnpaddedCoerceElts.push_back(Field1Ty); - - if (!Field2Ty) { - return ABIArgInfo::getCoerceAndExpand( - llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()), - UnpaddedCoerceElts[0]); - } - - CharUnits Field2Align = - CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty)); - CharUnits Field1End = Field1Off + - CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty)); - CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align); - - CharUnits Padding = CharUnits::Zero(); - if (Field2Off > Field2OffNoPadNoPack) - Padding = Field2Off - Field2OffNoPadNoPack; - else if (Field2Off != Field2Align && Field2Off > Field1End) - Padding = Field2Off - Field1End; - - bool IsPacked = !Field2Off.isMultipleOf(Field2Align); - - if (!Padding.isZero()) - CoerceElts.push_back(llvm::ArrayType::get( - llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity())); - - CoerceElts.push_back(Field2Ty); - UnpaddedCoerceElts.push_back(Field2Ty); - - auto CoerceToType = - llvm::StructType::get(getVMContext(), CoerceElts, IsPacked); - auto UnpaddedCoerceToType = - llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked); - - return ABIArgInfo::getCoerceAndExpand(CoerceToType, UnpaddedCoerceToType); -} - -// Fixed-length RVV vectors are represented as scalable vectors in function -// args/return and must be coerced from fixed vectors. -ABIArgInfo RISCVABIInfo::coerceVLSVector(QualType Ty) const { - assert(Ty->isVectorType() && "expected vector type!"); - - const auto *VT = Ty->castAs(); - assert(VT->getVectorKind() == VectorType::RVVFixedLengthDataVector && - "Unexpected vector kind"); - - assert(VT->getElementType()->isBuiltinType() && "expected builtin type!"); - - const auto *BT = VT->getElementType()->castAs(); - unsigned EltSize = getContext().getTypeSize(BT); - llvm::ScalableVectorType *ResType = - llvm::ScalableVectorType::get(CGT.ConvertType(VT->getElementType()), - llvm::RISCV::RVVBitsPerBlock / EltSize); - return ABIArgInfo::getDirect(ResType); -} - -ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, bool IsFixed, - int &ArgGPRsLeft, - int &ArgFPRsLeft) const { - assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow"); - Ty = useFirstFieldIfTransparentUnion(Ty); - - // Structures with either a non-trivial destructor or a non-trivial - // copy constructor are always passed indirectly. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { - if (ArgGPRsLeft) - ArgGPRsLeft -= 1; - return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == - CGCXXABI::RAA_DirectInMemory); - } - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - uint64_t Size = getContext().getTypeSize(Ty); - - // Pass floating point values via FPRs if possible. - if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() && - FLen >= Size && ArgFPRsLeft) { - ArgFPRsLeft--; - return ABIArgInfo::getDirect(); - } - - // Complex types for the hard float ABI must be passed direct rather than - // using CoerceAndExpand. - if (IsFixed && Ty->isComplexType() && FLen && ArgFPRsLeft >= 2) { - QualType EltTy = Ty->castAs()->getElementType(); - if (getContext().getTypeSize(EltTy) <= FLen) { - ArgFPRsLeft -= 2; - return ABIArgInfo::getDirect(); - } - } - - if (IsFixed && FLen && Ty->isStructureOrClassType()) { - llvm::Type *Field1Ty = nullptr; - llvm::Type *Field2Ty = nullptr; - CharUnits Field1Off = CharUnits::Zero(); - CharUnits Field2Off = CharUnits::Zero(); - int NeededArgGPRs = 0; - int NeededArgFPRs = 0; - bool IsCandidate = - detectFPCCEligibleStruct(Ty, Field1Ty, Field1Off, Field2Ty, Field2Off, - NeededArgGPRs, NeededArgFPRs); - if (IsCandidate && NeededArgGPRs <= ArgGPRsLeft && - NeededArgFPRs <= ArgFPRsLeft) { - ArgGPRsLeft -= NeededArgGPRs; - ArgFPRsLeft -= NeededArgFPRs; - return coerceAndExpandFPCCEligibleStruct(Field1Ty, Field1Off, Field2Ty, - Field2Off); - } - } - - uint64_t NeededAlign = getContext().getTypeAlign(Ty); - // Determine the number of GPRs needed to pass the current argument - // according to the ABI. 2*XLen-aligned varargs are passed in "aligned" - // register pairs, so may consume 3 registers. - int NeededArgGPRs = 1; - if (!IsFixed && NeededAlign == 2 * XLen) - NeededArgGPRs = 2 + (ArgGPRsLeft % 2); - else if (Size > XLen && Size <= 2 * XLen) - NeededArgGPRs = 2; - - if (NeededArgGPRs > ArgGPRsLeft) { - NeededArgGPRs = ArgGPRsLeft; - } - - ArgGPRsLeft -= NeededArgGPRs; - - if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // All integral types are promoted to XLen width - if (Size < XLen && Ty->isIntegralOrEnumerationType()) { - return extendType(Ty); - } - - if (const auto *EIT = Ty->getAs()) { - if (EIT->getNumBits() < XLen) - return extendType(Ty); - if (EIT->getNumBits() > 128 || - (!getContext().getTargetInfo().hasInt128Type() && - EIT->getNumBits() > 64)) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - } - - return ABIArgInfo::getDirect(); - } - - if (const VectorType *VT = Ty->getAs()) - if (VT->getVectorKind() == VectorType::RVVFixedLengthDataVector) - return coerceVLSVector(Ty); - - // Aggregates which are <= 2*XLen will be passed in registers if possible, - // so coerce to integers. - if (Size <= 2 * XLen) { - unsigned Alignment = getContext().getTypeAlign(Ty); - - // Use a single XLen int if possible, 2*XLen if 2*XLen alignment is - // required, and a 2-element XLen array if only XLen alignment is required. - if (Size <= XLen) { - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), XLen)); - } else if (Alignment == 2 * XLen) { - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), 2 * XLen)); - } else { - return ABIArgInfo::getDirect(llvm::ArrayType::get( - llvm::IntegerType::get(getVMContext(), XLen), 2)); - } - } - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); -} - -ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - int ArgGPRsLeft = 2; - int ArgFPRsLeft = FLen ? 2 : 0; - - // The rules for return and argument types are the same, so defer to - // classifyArgumentType. - return classifyArgumentType(RetTy, /*IsFixed=*/true, ArgGPRsLeft, - ArgFPRsLeft); -} - -Address RISCVABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8); - - // Empty records are ignored for parameter passing purposes. - if (isEmptyRecord(getContext(), Ty, true)) { - Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr), - getVAListElementType(CGF), SlotSize); - Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); - return Addr; - } - - auto TInfo = getContext().getTypeInfoInChars(Ty); - - // Arguments bigger than 2*Xlen bytes are passed indirectly. - bool IsIndirect = TInfo.Width > 2 * SlotSize; - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TInfo, - SlotSize, /*AllowHigherAlign=*/true); -} - -ABIArgInfo RISCVABIInfo::extendType(QualType Ty) const { - int TySize = getContext().getTypeSize(Ty); - // RV64 ABI requires unsigned 32 bit integers to be sign extended. - if (XLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32) - return ABIArgInfo::getSignExtend(Ty); - return ABIArgInfo::getExtend(Ty); -} - -namespace { -class RISCVTargetCodeGenInfo : public TargetCodeGenInfo { -public: - RISCVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen, - unsigned FLen) - : TargetCodeGenInfo(std::make_unique(CGT, XLen, FLen)) {} - - void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, - CodeGen::CodeGenModule &CGM) const override { - const auto *FD = dyn_cast_or_null(D); - if (!FD) return; - - const auto *Attr = FD->getAttr(); - if (!Attr) - return; - - const char *Kind; - switch (Attr->getInterrupt()) { - case RISCVInterruptAttr::supervisor: Kind = "supervisor"; break; - case RISCVInterruptAttr::machine: Kind = "machine"; break; - } - - auto *Fn = cast(GV); - - Fn->addFnAttr("interrupt", Kind); - } -}; -} // namespace - -//===----------------------------------------------------------------------===// -// VE ABI Implementation. -// -namespace { -class VEABIInfo : public DefaultABIInfo { -public: - VEABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - -private: - ABIArgInfo classifyReturnType(QualType RetTy) const; - ABIArgInfo classifyArgumentType(QualType RetTy) const; - void computeInfo(CGFunctionInfo &FI) const override; -}; -} // end anonymous namespace - -ABIArgInfo VEABIInfo::classifyReturnType(QualType Ty) const { - if (Ty->isAnyComplexType()) - return ABIArgInfo::getDirect(); - uint64_t Size = getContext().getTypeSize(Ty); - if (Size < 64 && Ty->isIntegerType()) - return ABIArgInfo::getExtend(Ty); - return DefaultABIInfo::classifyReturnType(Ty); -} - -ABIArgInfo VEABIInfo::classifyArgumentType(QualType Ty) const { - if (Ty->isAnyComplexType()) - return ABIArgInfo::getDirect(); - uint64_t Size = getContext().getTypeSize(Ty); - if (Size < 64 && Ty->isIntegerType()) - return ABIArgInfo::getExtend(Ty); - return DefaultABIInfo::classifyArgumentType(Ty); -} - -void VEABIInfo::computeInfo(CGFunctionInfo &FI) const { - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &Arg : FI.arguments()) - Arg.info = classifyArgumentType(Arg.type); -} - -namespace { -class VETargetCodeGenInfo : public TargetCodeGenInfo { -public: - VETargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} - // VE ABI requires the arguments of variadic and prototype-less functions - // are passed in both registers and memory. - bool isNoProtoCallVariadic(const CallArgList &args, - const FunctionNoProtoType *fnType) const override { - return true; - } -}; -} // end anonymous namespace - -//===----------------------------------------------------------------------===// -// CSKY ABI Implementation -//===----------------------------------------------------------------------===// -namespace { -class CSKYABIInfo : public DefaultABIInfo { - static const int NumArgGPRs = 4; - static const int NumArgFPRs = 4; - - static const unsigned XLen = 32; - unsigned FLen; - -public: - CSKYABIInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen) - : DefaultABIInfo(CGT), FLen(FLen) {} - - void computeInfo(CGFunctionInfo &FI) const override; - ABIArgInfo classifyArgumentType(QualType Ty, int &ArgGPRsLeft, - int &ArgFPRsLeft, - bool isReturnType = false) const; - ABIArgInfo classifyReturnType(QualType RetTy) const; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; -}; - -} // end anonymous namespace - -void CSKYABIInfo::computeInfo(CGFunctionInfo &FI) const { - QualType RetTy = FI.getReturnType(); - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(RetTy); - - bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect; - - // We must track the number of GPRs used in order to conform to the CSKY - // ABI, as integer scalars passed in registers should have signext/zeroext - // when promoted. - int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs; - int ArgFPRsLeft = FLen ? NumArgFPRs : 0; - - for (auto &ArgInfo : FI.arguments()) { - ArgInfo.info = classifyArgumentType(ArgInfo.type, ArgGPRsLeft, ArgFPRsLeft); - } -} - -Address CSKYABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8); - - // Empty records are ignored for parameter passing purposes. - if (isEmptyRecord(getContext(), Ty, true)) { - Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr), - getVAListElementType(CGF), SlotSize); - Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); - return Addr; - } - - auto TInfo = getContext().getTypeInfoInChars(Ty); - - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, false, TInfo, SlotSize, - /*AllowHigherAlign=*/true); -} - -ABIArgInfo CSKYABIInfo::classifyArgumentType(QualType Ty, int &ArgGPRsLeft, - int &ArgFPRsLeft, - bool isReturnType) const { - assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow"); - Ty = useFirstFieldIfTransparentUnion(Ty); - - // Structures with either a non-trivial destructor or a non-trivial - // copy constructor are always passed indirectly. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { - if (ArgGPRsLeft) - ArgGPRsLeft -= 1; - return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == - CGCXXABI::RAA_DirectInMemory); - } - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - if (!Ty->getAsUnionType()) - if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) - return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); - - uint64_t Size = getContext().getTypeSize(Ty); - // Pass floating point values via FPRs if possible. - if (Ty->isFloatingType() && !Ty->isComplexType() && FLen >= Size && - ArgFPRsLeft) { - ArgFPRsLeft--; - return ABIArgInfo::getDirect(); - } - - // Complex types for the hard float ABI must be passed direct rather than - // using CoerceAndExpand. - if (Ty->isComplexType() && FLen && !isReturnType) { - QualType EltTy = Ty->castAs()->getElementType(); - if (getContext().getTypeSize(EltTy) <= FLen) { - ArgFPRsLeft -= 2; - return ABIArgInfo::getDirect(); - } - } - - if (!isAggregateTypeForABI(Ty)) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // All integral types are promoted to XLen width, unless passed on the - // stack. - if (Size < XLen && Ty->isIntegralOrEnumerationType()) - return ABIArgInfo::getExtend(Ty); - - if (const auto *EIT = Ty->getAs()) { - if (EIT->getNumBits() < XLen) - return ABIArgInfo::getExtend(Ty); - } - - return ABIArgInfo::getDirect(); - } - - // For argument type, the first 4*XLen parts of aggregate will be passed - // in registers, and the rest will be passed in stack. - // So we can coerce to integers directly and let backend handle it correctly. - // For return type, aggregate which <= 2*XLen will be returned in registers. - // Otherwise, aggregate will be returned indirectly. - if (!isReturnType || (isReturnType && Size <= 2 * XLen)) { - if (Size <= XLen) { - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), XLen)); - } else { - return ABIArgInfo::getDirect(llvm::ArrayType::get( - llvm::IntegerType::get(getVMContext(), XLen), (Size + 31) / XLen)); - } - } - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); -} - -ABIArgInfo CSKYABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - int ArgGPRsLeft = 2; - int ArgFPRsLeft = FLen ? 1 : 0; - - // The rules for return and argument types are the same, so defer to - // classifyArgumentType. - return classifyArgumentType(RetTy, ArgGPRsLeft, ArgFPRsLeft, true); -} - -namespace { -class CSKYTargetCodeGenInfo : public TargetCodeGenInfo { -public: - CSKYTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen) - : TargetCodeGenInfo(std::make_unique(CGT, FLen)) {} -}; -} // end anonymous namespace - -//===----------------------------------------------------------------------===// -// BPF ABI Implementation -//===----------------------------------------------------------------------===// - -namespace { - -class BPFABIInfo : public DefaultABIInfo { -public: - BPFABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} - - ABIArgInfo classifyArgumentType(QualType Ty) const { - Ty = useFirstFieldIfTransparentUnion(Ty); - - if (isAggregateTypeForABI(Ty)) { - uint64_t Bits = getContext().getTypeSize(Ty); - if (Bits == 0) - return ABIArgInfo::getIgnore(); - - // If the aggregate needs 1 or 2 registers, do not use reference. - if (Bits <= 128) { - llvm::Type *CoerceTy; - if (Bits <= 64) { - CoerceTy = - llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8)); - } else { - llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), 64); - CoerceTy = llvm::ArrayType::get(RegTy, 2); - } - return ABIArgInfo::getDirect(CoerceTy); - } else { - return getNaturalAlignIndirect(Ty); - } - } - - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - ASTContext &Context = getContext(); - if (const auto *EIT = Ty->getAs()) - if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty)) - return getNaturalAlignIndirect(Ty); - - return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) - : ABIArgInfo::getDirect()); - } - - ABIArgInfo classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - - if (isAggregateTypeForABI(RetTy)) - return getNaturalAlignIndirect(RetTy); - - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = RetTy->getAs()) - RetTy = EnumTy->getDecl()->getIntegerType(); - - ASTContext &Context = getContext(); - if (const auto *EIT = RetTy->getAs()) - if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty)) - return getNaturalAlignIndirect(RetTy); - - // Caller will do necessary sign/zero extension. - return ABIArgInfo::getDirect(); - } - - void computeInfo(CGFunctionInfo &FI) const override { - FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); - for (auto &I : FI.arguments()) - I.info = classifyArgumentType(I.type); - } - -}; - -class BPFTargetCodeGenInfo : public TargetCodeGenInfo { -public: - BPFTargetCodeGenInfo(CodeGenTypes &CGT) - : TargetCodeGenInfo(std::make_unique(CGT)) {} -}; - -} - -// LoongArch ABI Implementation. Documented at -// https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html -// -//===----------------------------------------------------------------------===// - -namespace { -class LoongArchABIInfo : public DefaultABIInfo { -private: - // Size of the integer ('r') registers in bits. - unsigned GRLen; - // Size of the floating point ('f') registers in bits. - unsigned FRLen; - // Number of general-purpose argument registers. - static const int NumGARs = 8; - // Number of floating-point argument registers. - static const int NumFARs = 8; - bool detectFARsEligibleStructHelper(QualType Ty, CharUnits CurOff, - llvm::Type *&Field1Ty, - CharUnits &Field1Off, - llvm::Type *&Field2Ty, - CharUnits &Field2Off) const; - -public: - LoongArchABIInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen, unsigned FRLen) - : DefaultABIInfo(CGT), GRLen(GRLen), FRLen(FRLen) {} - - void computeInfo(CGFunctionInfo &FI) const override; - - ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &GARsLeft, - int &FARsLeft) const; - ABIArgInfo classifyReturnType(QualType RetTy) const; - - Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const override; - - ABIArgInfo extendType(QualType Ty) const; - - bool detectFARsEligibleStruct(QualType Ty, llvm::Type *&Field1Ty, - CharUnits &Field1Off, llvm::Type *&Field2Ty, - CharUnits &Field2Off, int &NeededArgGPRs, - int &NeededArgFPRs) const; - ABIArgInfo coerceAndExpandFARsEligibleStruct(llvm::Type *Field1Ty, - CharUnits Field1Off, - llvm::Type *Field2Ty, - CharUnits Field2Off) const; -}; -} // end anonymous namespace - -void LoongArchABIInfo::computeInfo(CGFunctionInfo &FI) const { - QualType RetTy = FI.getReturnType(); - if (!getCXXABI().classifyReturnType(FI)) - FI.getReturnInfo() = classifyReturnType(RetTy); - - // IsRetIndirect is true if classifyArgumentType indicated the value should - // be passed indirect, or if the type size is a scalar greater than 2*GRLen - // and not a complex type with elements <= FRLen. e.g. fp128 is passed direct - // in LLVM IR, relying on the backend lowering code to rewrite the argument - // list and pass indirectly on LA32. - bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect; - if (!IsRetIndirect && RetTy->isScalarType() && - getContext().getTypeSize(RetTy) > (2 * GRLen)) { - if (RetTy->isComplexType() && FRLen) { - QualType EltTy = RetTy->castAs()->getElementType(); - IsRetIndirect = getContext().getTypeSize(EltTy) > FRLen; - } else { - // This is a normal scalar > 2*GRLen, such as fp128 on LA32. - IsRetIndirect = true; - } - } - - // We must track the number of GARs and FARs used in order to conform to the - // LoongArch ABI. As GAR usage is different for variadic arguments, we must - // also track whether we are examining a vararg or not. - int GARsLeft = IsRetIndirect ? NumGARs - 1 : NumGARs; - int FARsLeft = FRLen ? NumFARs : 0; - int NumFixedArgs = FI.getNumRequiredArgs(); - - int ArgNum = 0; - for (auto &ArgInfo : FI.arguments()) { - ArgInfo.info = classifyArgumentType( - ArgInfo.type, /*IsFixed=*/ArgNum < NumFixedArgs, GARsLeft, FARsLeft); - ArgNum++; - } -} - -// Returns true if the struct is a potential candidate to be passed in FARs (and -// GARs). If this function returns true, the caller is responsible for checking -// that if there is only a single field then that field is a float. -bool LoongArchABIInfo::detectFARsEligibleStructHelper( - QualType Ty, CharUnits CurOff, llvm::Type *&Field1Ty, CharUnits &Field1Off, - llvm::Type *&Field2Ty, CharUnits &Field2Off) const { - bool IsInt = Ty->isIntegralOrEnumerationType(); - bool IsFloat = Ty->isRealFloatingType(); - - if (IsInt || IsFloat) { - uint64_t Size = getContext().getTypeSize(Ty); - if (IsInt && Size > GRLen) - return false; - // Can't be eligible if larger than the FP registers. Half precision isn't - // currently supported on LoongArch and the ABI hasn't been confirmed, so - // default to the integer ABI in that case. - if (IsFloat && (Size > FRLen || Size < 32)) - return false; - // Can't be eligible if an integer type was already found (int+int pairs - // are not eligible). - if (IsInt && Field1Ty && Field1Ty->isIntegerTy()) - return false; - if (!Field1Ty) { - Field1Ty = CGT.ConvertType(Ty); - Field1Off = CurOff; - return true; - } - if (!Field2Ty) { - Field2Ty = CGT.ConvertType(Ty); - Field2Off = CurOff; - return true; - } - return false; - } - - if (auto CTy = Ty->getAs()) { - if (Field1Ty) - return false; - QualType EltTy = CTy->getElementType(); - if (getContext().getTypeSize(EltTy) > FRLen) - return false; - Field1Ty = CGT.ConvertType(EltTy); - Field1Off = CurOff; - Field2Ty = Field1Ty; - Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy); - return true; - } - - if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) { - uint64_t ArraySize = ATy->getSize().getZExtValue(); - QualType EltTy = ATy->getElementType(); - CharUnits EltSize = getContext().getTypeSizeInChars(EltTy); - for (uint64_t i = 0; i < ArraySize; ++i) { - if (!detectFARsEligibleStructHelper(EltTy, CurOff, Field1Ty, Field1Off, - Field2Ty, Field2Off)) - return false; - CurOff += EltSize; - } - return true; - } - - if (const auto *RTy = Ty->getAs()) { - // Structures with either a non-trivial destructor or a non-trivial - // copy constructor are not eligible for the FP calling convention. - if (getRecordArgABI(Ty, CGT.getCXXABI())) - return false; - if (isEmptyRecord(getContext(), Ty, true)) - return true; - const RecordDecl *RD = RTy->getDecl(); - // Unions aren't eligible unless they're empty (which is caught above). - if (RD->isUnion()) - return false; - const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); - // If this is a C++ record, check the bases first. - if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { - for (const CXXBaseSpecifier &B : CXXRD->bases()) { - const auto *BDecl = - cast(B.getType()->castAs()->getDecl()); - if (!detectFARsEligibleStructHelper( - B.getType(), CurOff + Layout.getBaseClassOffset(BDecl), - Field1Ty, Field1Off, Field2Ty, Field2Off)) - return false; - } - } - for (const FieldDecl *FD : RD->fields()) { - QualType QTy = FD->getType(); - if (FD->isBitField()) { - unsigned BitWidth = FD->getBitWidthValue(getContext()); - // Zero-width bitfields are ignored. - if (BitWidth == 0) - continue; - // Allow a bitfield with a type greater than GRLen as long as the - // bitwidth is GRLen or less. - if (getContext().getTypeSize(QTy) > GRLen && BitWidth <= GRLen) { - QTy = getContext().getIntTypeForBitwidth(GRLen, false); - } - } - - if (!detectFARsEligibleStructHelper( - QTy, - CurOff + getContext().toCharUnitsFromBits( - Layout.getFieldOffset(FD->getFieldIndex())), - Field1Ty, Field1Off, Field2Ty, Field2Off)) - return false; - } - return Field1Ty != nullptr; - } - - return false; -} - -// Determine if a struct is eligible to be passed in FARs (and GARs) (i.e., when -// flattened it contains a single fp value, fp+fp, or int+fp of appropriate -// size). If so, NeededFARs and NeededGARs are incremented appropriately. -bool LoongArchABIInfo::detectFARsEligibleStruct( - QualType Ty, llvm::Type *&Field1Ty, CharUnits &Field1Off, - llvm::Type *&Field2Ty, CharUnits &Field2Off, int &NeededGARs, - int &NeededFARs) const { - Field1Ty = nullptr; - Field2Ty = nullptr; - NeededGARs = 0; - NeededFARs = 0; - if (!detectFARsEligibleStructHelper(Ty, CharUnits::Zero(), Field1Ty, - Field1Off, Field2Ty, Field2Off)) - return false; - // Not really a candidate if we have a single int but no float. - if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy()) - return false; - if (Field1Ty && Field1Ty->isFloatingPointTy()) - NeededFARs++; - else if (Field1Ty) - NeededGARs++; - if (Field2Ty && Field2Ty->isFloatingPointTy()) - NeededFARs++; - else if (Field2Ty) - NeededGARs++; - return true; -} - -// Call getCoerceAndExpand for the two-element flattened struct described by -// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an -// appropriate coerceToType and unpaddedCoerceToType. -ABIArgInfo LoongArchABIInfo::coerceAndExpandFARsEligibleStruct( - llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty, - CharUnits Field2Off) const { - SmallVector CoerceElts; - SmallVector UnpaddedCoerceElts; - if (!Field1Off.isZero()) - CoerceElts.push_back(llvm::ArrayType::get( - llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity())); - - CoerceElts.push_back(Field1Ty); - UnpaddedCoerceElts.push_back(Field1Ty); - - if (!Field2Ty) { - return ABIArgInfo::getCoerceAndExpand( - llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()), - UnpaddedCoerceElts[0]); - } - - CharUnits Field2Align = - CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty)); - CharUnits Field1End = - Field1Off + - CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty)); - CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align); - - CharUnits Padding = CharUnits::Zero(); - if (Field2Off > Field2OffNoPadNoPack) - Padding = Field2Off - Field2OffNoPadNoPack; - else if (Field2Off != Field2Align && Field2Off > Field1End) - Padding = Field2Off - Field1End; - - bool IsPacked = !Field2Off.isMultipleOf(Field2Align); - - if (!Padding.isZero()) - CoerceElts.push_back(llvm::ArrayType::get( - llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity())); - - CoerceElts.push_back(Field2Ty); - UnpaddedCoerceElts.push_back(Field2Ty); - - return ABIArgInfo::getCoerceAndExpand( - llvm::StructType::get(getVMContext(), CoerceElts, IsPacked), - llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked)); -} - -ABIArgInfo LoongArchABIInfo::classifyArgumentType(QualType Ty, bool IsFixed, - int &GARsLeft, - int &FARsLeft) const { - assert(GARsLeft <= NumGARs && "GAR tracking underflow"); - Ty = useFirstFieldIfTransparentUnion(Ty); - - // Structures with either a non-trivial destructor or a non-trivial - // copy constructor are always passed indirectly. - if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { - if (GARsLeft) - GARsLeft -= 1; - return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == - CGCXXABI::RAA_DirectInMemory); - } - - // Ignore empty structs/unions. - if (isEmptyRecord(getContext(), Ty, true)) - return ABIArgInfo::getIgnore(); - - uint64_t Size = getContext().getTypeSize(Ty); - - // Pass floating point values via FARs if possible. - if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() && - FRLen >= Size && FARsLeft) { - FARsLeft--; - return ABIArgInfo::getDirect(); - } - - // Complex types for the *f or *d ABI must be passed directly rather than - // using CoerceAndExpand. - if (IsFixed && Ty->isComplexType() && FRLen && FARsLeft >= 2) { - QualType EltTy = Ty->castAs()->getElementType(); - if (getContext().getTypeSize(EltTy) <= FRLen) { - FARsLeft -= 2; - return ABIArgInfo::getDirect(); - } - } - - if (IsFixed && FRLen && Ty->isStructureOrClassType()) { - llvm::Type *Field1Ty = nullptr; - llvm::Type *Field2Ty = nullptr; - CharUnits Field1Off = CharUnits::Zero(); - CharUnits Field2Off = CharUnits::Zero(); - int NeededGARs = 0; - int NeededFARs = 0; - bool IsCandidate = detectFARsEligibleStruct( - Ty, Field1Ty, Field1Off, Field2Ty, Field2Off, NeededGARs, NeededFARs); - if (IsCandidate && NeededGARs <= GARsLeft && NeededFARs <= FARsLeft) { - GARsLeft -= NeededGARs; - FARsLeft -= NeededFARs; - return coerceAndExpandFARsEligibleStruct(Field1Ty, Field1Off, Field2Ty, - Field2Off); - } - } - - uint64_t NeededAlign = getContext().getTypeAlign(Ty); - // Determine the number of GARs needed to pass the current argument - // according to the ABI. 2*GRLen-aligned varargs are passed in "aligned" - // register pairs, so may consume 3 registers. - int NeededGARs = 1; - if (!IsFixed && NeededAlign == 2 * GRLen) - NeededGARs = 2 + (GARsLeft % 2); - else if (Size > GRLen && Size <= 2 * GRLen) - NeededGARs = 2; - - if (NeededGARs > GARsLeft) - NeededGARs = GARsLeft; - - GARsLeft -= NeededGARs; - - if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) { - // Treat an enum type as its underlying type. - if (const EnumType *EnumTy = Ty->getAs()) - Ty = EnumTy->getDecl()->getIntegerType(); - - // All integral types are promoted to GRLen width. - if (Size < GRLen && Ty->isIntegralOrEnumerationType()) - return extendType(Ty); - - if (const auto *EIT = Ty->getAs()) { - if (EIT->getNumBits() < GRLen) - return extendType(Ty); - if (EIT->getNumBits() > 128 || - (!getContext().getTargetInfo().hasInt128Type() && - EIT->getNumBits() > 64)) - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); - } - - return ABIArgInfo::getDirect(); - } - - // Aggregates which are <= 2*GRLen will be passed in registers if possible, - // so coerce to integers. - if (Size <= 2 * GRLen) { - // Use a single GRLen int if possible, 2*GRLen if 2*GRLen alignment is - // required, and a 2-element GRLen array if only GRLen alignment is - // required. - if (Size <= GRLen) { - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), GRLen)); - } - if (getContext().getTypeAlign(Ty) == 2 * GRLen) { - return ABIArgInfo::getDirect( - llvm::IntegerType::get(getVMContext(), 2 * GRLen)); - } - return ABIArgInfo::getDirect( - llvm::ArrayType::get(llvm::IntegerType::get(getVMContext(), GRLen), 2)); - } - return getNaturalAlignIndirect(Ty, /*ByVal=*/false); -} - -ABIArgInfo LoongArchABIInfo::classifyReturnType(QualType RetTy) const { - if (RetTy->isVoidType()) - return ABIArgInfo::getIgnore(); - // The rules for return and argument types are the same, so defer to - // classifyArgumentType. - int GARsLeft = 2; - int FARsLeft = FRLen ? 2 : 0; - return classifyArgumentType(RetTy, /*IsFixed=*/true, GARsLeft, FARsLeft); -} - -Address LoongArchABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, - QualType Ty) const { - CharUnits SlotSize = CharUnits::fromQuantity(GRLen / 8); - - // Empty records are ignored for parameter passing purposes. - if (isEmptyRecord(getContext(), Ty, true)) { - Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr), - getVAListElementType(CGF), SlotSize); - Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); - return Addr; - } - - auto TInfo = getContext().getTypeInfoInChars(Ty); - - // Arguments bigger than 2*GRLen bytes are passed indirectly. - return emitVoidPtrVAArg(CGF, VAListAddr, Ty, - /*IsIndirect=*/TInfo.Width > 2 * SlotSize, TInfo, - SlotSize, - /*AllowHigherAlign=*/true); -} - -ABIArgInfo LoongArchABIInfo::extendType(QualType Ty) const { - int TySize = getContext().getTypeSize(Ty); - // LA64 ABI requires unsigned 32 bit integers to be sign extended. - if (GRLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32) - return ABIArgInfo::getSignExtend(Ty); - return ABIArgInfo::getExtend(Ty); -} - -namespace { -class LoongArchTargetCodeGenInfo : public TargetCodeGenInfo { -public: - LoongArchTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen, - unsigned FRLen) - : TargetCodeGenInfo( - std::make_unique(CGT, GRLen, FRLen)) {} -}; -} // namespace - -//===----------------------------------------------------------------------===// -// Driver code -//===----------------------------------------------------------------------===// - -// TODO: Move to CodeGenModule.cpp. -bool CodeGenModule::supportsCOMDAT() const { - return getTriple().supportsCOMDAT(); -} - -// TODO: Move to CodeGenModule.cpp. -static std::unique_ptr -createTargetCodeGenInfo(CodeGenModule &CGM) { - const TargetInfo &Target = CGM.getTarget(); - const llvm::Triple &Triple = Target.getTriple(); - const CodeGenOptions &CodeGenOpts = CGM.getCodeGenOpts(); - - switch (Triple.getArch()) { - default: - return createDefaultTargetCodeGenInfo(CGM); - - case llvm::Triple::le32: - return createPNaClTargetCodeGenInfo(CGM); - case llvm::Triple::m68k: - return createM68kTargetCodeGenInfo(CGM); - case llvm::Triple::mips: - case llvm::Triple::mipsel: - if (Triple.getOS() == llvm::Triple::NaCl) - return createPNaClTargetCodeGenInfo(CGM); - return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/true); - - case llvm::Triple::mips64: - case llvm::Triple::mips64el: - return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/false); - - case llvm::Triple::avr: { - // For passing parameters, R8~R25 are used on avr, and R18~R25 are used - // on avrtiny. For passing return value, R18~R25 are used on avr, and - // R22~R25 are used on avrtiny. - unsigned NPR = Target.getABI() == "avrtiny" ? 6 : 18; - unsigned NRR = Target.getABI() == "avrtiny" ? 4 : 8; - return createAVRTargetCodeGenInfo(CGM, NPR, NRR); - } - - case llvm::Triple::aarch64: - case llvm::Triple::aarch64_32: - case llvm::Triple::aarch64_be: { - AArch64ABIKind Kind = AArch64ABIKind::AAPCS; - if (Target.getABI() == "darwinpcs") - Kind = AArch64ABIKind::DarwinPCS; - else if (Triple.isOSWindows()) - return createWindowsAArch64TargetCodeGenInfo(CGM, AArch64ABIKind::Win64); - - return createAArch64TargetCodeGenInfo(CGM, Kind); - } - - case llvm::Triple::wasm32: - case llvm::Triple::wasm64: { - WebAssemblyABIKind Kind = WebAssemblyABIKind::MVP; - if (Target.getABI() == "experimental-mv") - Kind = WebAssemblyABIKind::ExperimentalMV; - return createWebAssemblyTargetCodeGenInfo(CGM, Kind); - } - - case llvm::Triple::arm: - case llvm::Triple::armeb: - case llvm::Triple::thumb: - case llvm::Triple::thumbeb: { - if (Triple.getOS() == llvm::Triple::Win32) - return createWindowsARMTargetCodeGenInfo(CGM, ARMABIKind::AAPCS_VFP); - - ARMABIKind Kind = ARMABIKind::AAPCS; - StringRef ABIStr = Target.getABI(); - if (ABIStr == "apcs-gnu") - Kind = ARMABIKind::APCS; - else if (ABIStr == "aapcs16") - Kind = ARMABIKind::AAPCS16_VFP; - else if (CodeGenOpts.FloatABI == "hard" || - (CodeGenOpts.FloatABI != "soft" && - (Triple.getEnvironment() == llvm::Triple::GNUEABIHF || - Triple.getEnvironment() == llvm::Triple::MuslEABIHF || - Triple.getEnvironment() == llvm::Triple::EABIHF))) - Kind = ARMABIKind::AAPCS_VFP; - - return createARMTargetCodeGenInfo(CGM, Kind); - } - - case llvm::Triple::ppc: { - if (Triple.isOSAIX()) - return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/false); - - bool IsSoftFloat = - CodeGenOpts.FloatABI == "soft" || Target.hasFeature("spe"); - return createPPC32TargetCodeGenInfo(CGM, IsSoftFloat); - } - case llvm::Triple::ppcle: { - bool IsSoftFloat = CodeGenOpts.FloatABI == "soft"; - return createPPC32TargetCodeGenInfo(CGM, IsSoftFloat); - } - case llvm::Triple::ppc64: - if (Triple.isOSAIX()) - return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/true); - - if (Triple.isOSBinFormatELF()) { - PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv1; - if (Target.getABI() == "elfv2") - Kind = PPC64_SVR4_ABIKind::ELFv2; - bool IsSoftFloat = CodeGenOpts.FloatABI == "soft"; - - return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, IsSoftFloat); - } - return createPPC64TargetCodeGenInfo(CGM); - case llvm::Triple::ppc64le: { - assert(Triple.isOSBinFormatELF() && "PPC64 LE non-ELF not supported!"); - PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv2; - if (Target.getABI() == "elfv1") - Kind = PPC64_SVR4_ABIKind::ELFv1; - bool IsSoftFloat = CodeGenOpts.FloatABI == "soft"; - - return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, IsSoftFloat); - } - - case llvm::Triple::nvptx: - case llvm::Triple::nvptx64: - return createNVPTXTargetCodeGenInfo(CGM); - - case llvm::Triple::msp430: - return createMSP430TargetCodeGenInfo(CGM); - - case llvm::Triple::riscv32: - case llvm::Triple::riscv64: { - StringRef ABIStr = Target.getABI(); - unsigned XLen = Target.getPointerWidth(LangAS::Default); - unsigned ABIFLen = 0; - if (ABIStr.endswith("f")) - ABIFLen = 32; - else if (ABIStr.endswith("d")) - ABIFLen = 64; - return createRISCVTargetCodeGenInfo(CGM, XLen, ABIFLen); - } - - case llvm::Triple::systemz: { - bool SoftFloat = CodeGenOpts.FloatABI == "soft"; - bool HasVector = !SoftFloat && Target.getABI() == "vector"; - return createSystemZTargetCodeGenInfo(CGM, HasVector, SoftFloat); - } - - case llvm::Triple::tce: - case llvm::Triple::tcele: - return createTCETargetCodeGenInfo(CGM); - - case llvm::Triple::x86: { - bool IsDarwinVectorABI = Triple.isOSDarwin(); - bool IsWin32FloatStructABI = Triple.isOSWindows() && !Triple.isOSCygMing(); - - if (Triple.getOS() == llvm::Triple::Win32) { - return createWinX86_32TargetCodeGenInfo( - CGM, IsDarwinVectorABI, IsWin32FloatStructABI, - CodeGenOpts.NumRegisterParameters); - } - return createX86_32TargetCodeGenInfo( - CGM, IsDarwinVectorABI, IsWin32FloatStructABI, - CodeGenOpts.NumRegisterParameters, CodeGenOpts.FloatABI == "soft"); - } - - case llvm::Triple::x86_64: { - StringRef ABI = Target.getABI(); - X86AVXABILevel AVXLevel = (ABI == "avx512" ? X86AVXABILevel::AVX512 - : ABI == "avx" ? X86AVXABILevel::AVX - : X86AVXABILevel::None); - - switch (Triple.getOS()) { - case llvm::Triple::Win32: - return createWinX86_64TargetCodeGenInfo(CGM, AVXLevel); - default: - return createX86_64TargetCodeGenInfo(CGM, AVXLevel); - } - } - case llvm::Triple::hexagon: - return createHexagonTargetCodeGenInfo(CGM); - case llvm::Triple::lanai: - return createLanaiTargetCodeGenInfo(CGM); - case llvm::Triple::r600: - return createAMDGPUTargetCodeGenInfo(CGM); - case llvm::Triple::amdgcn: - return createAMDGPUTargetCodeGenInfo(CGM); - case llvm::Triple::sparc: - return createSparcV8TargetCodeGenInfo(CGM); - case llvm::Triple::sparcv9: - return createSparcV9TargetCodeGenInfo(CGM); - case llvm::Triple::xcore: - return createXCoreTargetCodeGenInfo(CGM); - case llvm::Triple::arc: - return createARCTargetCodeGenInfo(CGM); - case llvm::Triple::spir: - case llvm::Triple::spir64: - return createCommonSPIRTargetCodeGenInfo(CGM); - case llvm::Triple::spirv32: - case llvm::Triple::spirv64: - return createSPIRVTargetCodeGenInfo(CGM); - case llvm::Triple::ve: - return createVETargetCodeGenInfo(CGM); - case llvm::Triple::csky: { - bool IsSoftFloat = !Target.hasFeature("hard-float-abi"); - bool hasFP64 = - Target.hasFeature("fpuv2_df") || Target.hasFeature("fpuv3_df"); - return createCSKYTargetCodeGenInfo(CGM, IsSoftFloat ? 0 - : hasFP64 ? 64 - : 32); - } - case llvm::Triple::bpfeb: - case llvm::Triple::bpfel: - return createBPFTargetCodeGenInfo(CGM); - case llvm::Triple::loongarch32: - case llvm::Triple::loongarch64: { - StringRef ABIStr = Target.getABI(); - unsigned ABIFRLen = 0; - if (ABIStr.endswith("f")) - ABIFRLen = 32; - else if (ABIStr.endswith("d")) - ABIFRLen = 64; - return createLoongArchTargetCodeGenInfo( - CGM, Target.getPointerWidth(LangAS::Default), ABIFRLen); - } - } -} - -// TODO: Move to CodeGenModule.cpp. -const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() { - if (!TheTargetCodeGenInfo) - TheTargetCodeGenInfo = createTargetCodeGenInfo(*this); - return *TheTargetCodeGenInfo; -} - -/// Create an OpenCL kernel for an enqueued block. -/// -/// The kernel has the same function type as the block invoke function. Its -/// name is the name of the block invoke function postfixed with "_kernel". -/// It simply calls the block invoke function then returns. -llvm::Value *TargetCodeGenInfo::createEnqueuedBlockKernel( - CodeGenFunction &CGF, llvm::Function *Invoke, llvm::Type *BlockTy) const { - auto *InvokeFT = Invoke->getFunctionType(); - auto &C = CGF.getLLVMContext(); - std::string Name = Invoke->getName().str() + "_kernel"; - auto *FT = llvm::FunctionType::get(llvm::Type::getVoidTy(C), - InvokeFT->params(), false); - auto *F = llvm::Function::Create(FT, llvm::GlobalValue::ExternalLinkage, Name, - &CGF.CGM.getModule()); - llvm::CallingConv::ID KernelCC = - CGF.getTypes().ClangCallConvToLLVMCallConv(CallingConv::CC_OpenCLKernel); - F->setCallingConv(KernelCC); - - llvm::AttrBuilder KernelAttrs(C); - - // FIXME: This is missing setTargetAttributes - CGF.CGM.addDefaultFunctionDefinitionAttributes(KernelAttrs); - F->addFnAttrs(KernelAttrs); - - auto IP = CGF.Builder.saveIP(); - auto *BB = llvm::BasicBlock::Create(C, "entry", F); - auto &Builder = CGF.Builder; - Builder.SetInsertPoint(BB); - llvm::SmallVector Args(llvm::make_pointer_range(F->args())); - llvm::CallInst *Call = Builder.CreateCall(Invoke, Args); - Call->setCallingConv(Invoke->getCallingConv()); - - Builder.CreateRetVoid(); - Builder.restoreIP(IP); - return F; -} - -/// Create an OpenCL kernel for an enqueued block. -/// -/// The type of the first argument (the block literal) is the struct type -/// of the block literal instead of a pointer type. The first argument -/// (block literal) is passed directly by value to the kernel. The kernel -/// allocates the same type of struct on stack and stores the block literal -/// to it and passes its pointer to the block invoke function. The kernel -/// has "enqueued-block" function attribute and kernel argument metadata. -llvm::Value *AMDGPUTargetCodeGenInfo::createEnqueuedBlockKernel( - CodeGenFunction &CGF, llvm::Function *Invoke, llvm::Type *BlockTy) const { - auto &Builder = CGF.Builder; - auto &C = CGF.getLLVMContext(); - - auto *InvokeFT = Invoke->getFunctionType(); - llvm::SmallVector ArgTys; - llvm::SmallVector AddressQuals; - llvm::SmallVector AccessQuals; - llvm::SmallVector ArgTypeNames; - llvm::SmallVector ArgBaseTypeNames; - llvm::SmallVector ArgTypeQuals; - llvm::SmallVector ArgNames; - - ArgTys.push_back(BlockTy); - ArgTypeNames.push_back(llvm::MDString::get(C, "__block_literal")); - AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(0))); - ArgBaseTypeNames.push_back(llvm::MDString::get(C, "__block_literal")); - ArgTypeQuals.push_back(llvm::MDString::get(C, "")); - AccessQuals.push_back(llvm::MDString::get(C, "none")); - ArgNames.push_back(llvm::MDString::get(C, "block_literal")); - for (unsigned I = 1, E = InvokeFT->getNumParams(); I < E; ++I) { - ArgTys.push_back(InvokeFT->getParamType(I)); - ArgTypeNames.push_back(llvm::MDString::get(C, "void*")); - AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(3))); - AccessQuals.push_back(llvm::MDString::get(C, "none")); - ArgBaseTypeNames.push_back(llvm::MDString::get(C, "void*")); - ArgTypeQuals.push_back(llvm::MDString::get(C, "")); - ArgNames.push_back( - llvm::MDString::get(C, (Twine("local_arg") + Twine(I)).str())); - } - std::string Name = Invoke->getName().str() + "_kernel"; - auto *FT = llvm::FunctionType::get(llvm::Type::getVoidTy(C), ArgTys, false); - auto *F = llvm::Function::Create(FT, llvm::GlobalValue::InternalLinkage, Name, - &CGF.CGM.getModule()); - F->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL); - - llvm::AttrBuilder KernelAttrs(C); - // FIXME: The invoke isn't applying the right attributes either - // FIXME: This is missing setTargetAttributes - CGF.CGM.addDefaultFunctionDefinitionAttributes(KernelAttrs); - KernelAttrs.addAttribute("enqueued-block"); - F->addFnAttrs(KernelAttrs); - - auto IP = CGF.Builder.saveIP(); - auto *BB = llvm::BasicBlock::Create(C, "entry", F); - Builder.SetInsertPoint(BB); - const auto BlockAlign = CGF.CGM.getDataLayout().getPrefTypeAlign(BlockTy); - auto *BlockPtr = Builder.CreateAlloca(BlockTy, nullptr); - BlockPtr->setAlignment(BlockAlign); - Builder.CreateAlignedStore(F->arg_begin(), BlockPtr, BlockAlign); - auto *Cast = Builder.CreatePointerCast(BlockPtr, InvokeFT->getParamType(0)); - llvm::SmallVector Args; - Args.push_back(Cast); - for (llvm::Argument &A : llvm::drop_begin(F->args())) - Args.push_back(&A); - llvm::CallInst *call = Builder.CreateCall(Invoke, Args); - call->setCallingConv(Invoke->getCallingConv()); - Builder.CreateRetVoid(); - Builder.restoreIP(IP); - - F->setMetadata("kernel_arg_addr_space", llvm::MDNode::get(C, AddressQuals)); - F->setMetadata("kernel_arg_access_qual", llvm::MDNode::get(C, AccessQuals)); - F->setMetadata("kernel_arg_type", llvm::MDNode::get(C, ArgTypeNames)); - F->setMetadata("kernel_arg_base_type", - llvm::MDNode::get(C, ArgBaseTypeNames)); - F->setMetadata("kernel_arg_type_qual", llvm::MDNode::get(C, ArgTypeQuals)); - if (CGF.CGM.getCodeGenOpts().EmitOpenCLArgMetadata) - F->setMetadata("kernel_arg_name", llvm::MDNode::get(C, ArgNames)); - - return F; -} +} // namespace std::unique_ptr CodeGen::createDefaultTargetCodeGenInfo(CodeGenModule &CGM) { return std::make_unique(CGM.getTypes()); } - -std::unique_ptr -CodeGen::createAArch64TargetCodeGenInfo(CodeGenModule &CGM, - AArch64ABIKind Kind) { - return std::make_unique(CGM.getTypes(), Kind); -} - -std::unique_ptr -CodeGen::createWindowsAArch64TargetCodeGenInfo(CodeGenModule &CGM, - AArch64ABIKind K) { - return std::make_unique(CGM.getTypes(), K); -} - -std::unique_ptr -CodeGen::createAMDGPUTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createARCTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createARMTargetCodeGenInfo(CodeGenModule &CGM, ARMABIKind Kind) { - return std::make_unique(CGM.getTypes(), Kind); -} - -std::unique_ptr -CodeGen::createWindowsARMTargetCodeGenInfo(CodeGenModule &CGM, ARMABIKind K) { - return std::make_unique(CGM.getTypes(), K); -} - -std::unique_ptr -CodeGen::createAVRTargetCodeGenInfo(CodeGenModule &CGM, unsigned NPR, - unsigned NRR) { - return std::make_unique(CGM.getTypes(), NPR, NRR); -} - -std::unique_ptr -CodeGen::createBPFTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createCSKYTargetCodeGenInfo(CodeGenModule &CGM, unsigned FLen) { - return std::make_unique(CGM.getTypes(), FLen); -} - -std::unique_ptr -CodeGen::createHexagonTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createLanaiTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createLoongArchTargetCodeGenInfo(CodeGenModule &CGM, unsigned GRLen, - unsigned FLen) { - return std::make_unique(CGM.getTypes(), GRLen, - FLen); -} - -std::unique_ptr -CodeGen::createM68kTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createMIPSTargetCodeGenInfo(CodeGenModule &CGM, bool IsOS32) { - return std::make_unique(CGM.getTypes(), IsOS32); -} - -std::unique_ptr -CodeGen::createMSP430TargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createNVPTXTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createPNaClTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createAIXTargetCodeGenInfo(CodeGenModule &CGM, bool Is64Bit) { - return std::make_unique(CGM.getTypes(), Is64Bit); -} - -std::unique_ptr -CodeGen::createPPC32TargetCodeGenInfo(CodeGenModule &CGM, bool SoftFloatABI) { - bool RetSmallStructInRegABI = PPC32TargetCodeGenInfo::isStructReturnInRegABI( - CGM.getTriple(), CGM.getCodeGenOpts()); - return std::make_unique(CGM.getTypes(), SoftFloatABI, - RetSmallStructInRegABI); -} - -std::unique_ptr -CodeGen::createPPC64TargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr CodeGen::createPPC64_SVR4_TargetCodeGenInfo( - CodeGenModule &CGM, PPC64_SVR4_ABIKind Kind, bool SoftFloatABI) { - return std::make_unique(CGM.getTypes(), Kind, - SoftFloatABI); -} - -std::unique_ptr -CodeGen::createRISCVTargetCodeGenInfo(CodeGenModule &CGM, unsigned XLen, - unsigned FLen) { - return std::make_unique(CGM.getTypes(), XLen, FLen); -} - -std::unique_ptr -CodeGen::createCommonSPIRTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createSPIRVTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createSparcV8TargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createSparcV9TargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createSystemZTargetCodeGenInfo(CodeGenModule &CGM, bool HasVector, - bool SoftFloatABI) { - return std::make_unique(CGM.getTypes(), HasVector, - SoftFloatABI); -} - -std::unique_ptr -CodeGen::createTCETargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createVETargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} - -std::unique_ptr -CodeGen::createWebAssemblyTargetCodeGenInfo(CodeGenModule &CGM, - WebAssemblyABIKind K) { - return std::make_unique(CGM.getTypes(), K); -} - -std::unique_ptr CodeGen::createX86_32TargetCodeGenInfo( - CodeGenModule &CGM, bool DarwinVectorABI, bool Win32StructABI, - unsigned NumRegisterParameters, bool SoftFloatABI) { - bool RetSmallStructInRegABI = X86_32TargetCodeGenInfo::isStructReturnInRegABI( - CGM.getTriple(), CGM.getCodeGenOpts()); - return std::make_unique( - CGM.getTypes(), DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI, - NumRegisterParameters, SoftFloatABI); -} - -std::unique_ptr CodeGen::createWinX86_32TargetCodeGenInfo( - CodeGenModule &CGM, bool DarwinVectorABI, bool Win32StructABI, - unsigned NumRegisterParameters) { - bool RetSmallStructInRegABI = X86_32TargetCodeGenInfo::isStructReturnInRegABI( - CGM.getTriple(), CGM.getCodeGenOpts()); - return std::make_unique( - CGM.getTypes(), DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI, - NumRegisterParameters); -} - -std::unique_ptr -CodeGen::createX86_64TargetCodeGenInfo(CodeGenModule &CGM, - X86AVXABILevel AVXLevel) { - return std::make_unique(CGM.getTypes(), AVXLevel); -} - -std::unique_ptr -CodeGen::createWinX86_64TargetCodeGenInfo(CodeGenModule &CGM, - X86AVXABILevel AVXLevel) { - return std::make_unique(CGM.getTypes(), AVXLevel); -} - -std::unique_ptr -CodeGen::createXCoreTargetCodeGenInfo(CodeGenModule &CGM) { - return std::make_unique(CGM.getTypes()); -} diff --git a/clang/lib/CodeGen/Targets/AArch64.cpp b/clang/lib/CodeGen/Targets/AArch64.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/AArch64.cpp @@ -0,0 +1,828 @@ +//===- AArch64.cpp --------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// AArch64 ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class AArch64ABIInfo : public ABIInfo { + AArch64ABIKind Kind; + +public: + AArch64ABIInfo(CodeGenTypes &CGT, AArch64ABIKind Kind) + : ABIInfo(CGT), Kind(Kind) {} + +private: + AArch64ABIKind getABIKind() const { return Kind; } + bool isDarwinPCS() const { return Kind == AArch64ABIKind::DarwinPCS; } + + ABIArgInfo classifyReturnType(QualType RetTy, bool IsVariadic) const; + ABIArgInfo classifyArgumentType(QualType RetTy, bool IsVariadic, + unsigned CallingConvention) const; + ABIArgInfo coerceIllegalVector(QualType Ty) const; + bool isHomogeneousAggregateBaseType(QualType Ty) const override; + bool isHomogeneousAggregateSmallEnough(const Type *Ty, + uint64_t Members) const override; + bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override; + + bool isIllegalVectorType(QualType Ty) const; + + void computeInfo(CGFunctionInfo &FI) const override { + if (!::classifyReturnType(getCXXABI(), FI, *this)) + FI.getReturnInfo() = + classifyReturnType(FI.getReturnType(), FI.isVariadic()); + + for (auto &it : FI.arguments()) + it.info = classifyArgumentType(it.type, FI.isVariadic(), + FI.getCallingConvention()); + } + + Address EmitDarwinVAArg(Address VAListAddr, QualType Ty, + CodeGenFunction &CGF) const; + + Address EmitAAPCSVAArg(Address VAListAddr, QualType Ty, + CodeGenFunction &CGF) const; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override { + llvm::Type *BaseTy = CGF.ConvertType(Ty); + if (isa(BaseTy)) + llvm::report_fatal_error("Passing SVE types to variadic functions is " + "currently not supported"); + + return Kind == AArch64ABIKind::Win64 ? EmitMSVAArg(CGF, VAListAddr, Ty) + : isDarwinPCS() ? EmitDarwinVAArg(VAListAddr, Ty, CGF) + : EmitAAPCSVAArg(VAListAddr, Ty, CGF); + } + + Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + bool allowBFloatArgsAndRet() const override { + return getTarget().hasBFloat16Type(); + } +}; + +class AArch64SwiftABIInfo : public SwiftABIInfo { +public: + explicit AArch64SwiftABIInfo(CodeGenTypes &CGT) + : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {} + + bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, + unsigned NumElts) const override; +}; + +class AArch64TargetCodeGenInfo : public TargetCodeGenInfo { +public: + AArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind Kind) + : TargetCodeGenInfo(std::make_unique(CGT, Kind)) { + SwiftInfo = std::make_unique(CGT); + } + + StringRef getARCRetainAutoreleasedReturnValueMarker() const override { + return "mov\tfp, fp\t\t// marker for objc_retainAutoreleaseReturnValue"; + } + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + return 31; + } + + bool doesReturnSlotInterfereWithArgs() const override { return false; } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + const FunctionDecl *FD = dyn_cast_or_null(D); + if (!FD) + return; + + const auto *TA = FD->getAttr(); + if (TA == nullptr) + return; + + ParsedTargetAttr Attr = + CGM.getTarget().parseTargetAttr(TA->getFeaturesStr()); + if (Attr.BranchProtection.empty()) + return; + + TargetInfo::BranchProtectionInfo BPI; + StringRef Error; + (void)CGM.getTarget().validateBranchProtection(Attr.BranchProtection, + Attr.CPU, BPI, Error); + assert(Error.empty()); + + auto *Fn = cast(GV); + static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"}; + Fn->addFnAttr("sign-return-address", SignReturnAddrStr[static_cast(BPI.SignReturnAddr)]); + + if (BPI.SignReturnAddr != LangOptions::SignReturnAddressScopeKind::None) { + Fn->addFnAttr("sign-return-address-key", + BPI.SignKey == LangOptions::SignReturnAddressKeyKind::AKey + ? "a_key" + : "b_key"); + } + + Fn->addFnAttr("branch-target-enforcement", + BPI.BranchTargetEnforcement ? "true" : "false"); + } + + bool isScalarizableAsmOperand(CodeGen::CodeGenFunction &CGF, + llvm::Type *Ty) const override { + if (CGF.getTarget().hasFeature("ls64")) { + auto *ST = dyn_cast(Ty); + if (ST && ST->getNumElements() == 1) { + auto *AT = dyn_cast(ST->getElementType(0)); + if (AT && AT->getNumElements() == 8 && + AT->getElementType()->isIntegerTy(64)) + return true; + } + } + return TargetCodeGenInfo::isScalarizableAsmOperand(CGF, Ty); + } +}; + +class WindowsAArch64TargetCodeGenInfo : public AArch64TargetCodeGenInfo { +public: + WindowsAArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind K) + : AArch64TargetCodeGenInfo(CGT, K) {} + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override; + + void getDependentLibraryOption(llvm::StringRef Lib, + llvm::SmallString<24> &Opt) const override { + Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib); + } + + void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value, + llvm::SmallString<32> &Opt) const override { + Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; + } +}; + +void WindowsAArch64TargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { + AArch64TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); + if (GV->isDeclaration()) + return; + addStackProbeTargetAttributes(D, GV, CGM); +} +} + +ABIArgInfo AArch64ABIInfo::coerceIllegalVector(QualType Ty) const { + assert(Ty->isVectorType() && "expected vector type!"); + + const auto *VT = Ty->castAs(); + if (VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) { + assert(VT->getElementType()->isBuiltinType() && "expected builtin type!"); + assert(VT->getElementType()->castAs()->getKind() == + BuiltinType::UChar && + "unexpected builtin type for SVE predicate!"); + return ABIArgInfo::getDirect(llvm::ScalableVectorType::get( + llvm::Type::getInt1Ty(getVMContext()), 16)); + } + + if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector) { + assert(VT->getElementType()->isBuiltinType() && "expected builtin type!"); + + const auto *BT = VT->getElementType()->castAs(); + llvm::ScalableVectorType *ResType = nullptr; + switch (BT->getKind()) { + default: + llvm_unreachable("unexpected builtin type for SVE vector!"); + case BuiltinType::SChar: + case BuiltinType::UChar: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getInt8Ty(getVMContext()), 16); + break; + case BuiltinType::Short: + case BuiltinType::UShort: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getInt16Ty(getVMContext()), 8); + break; + case BuiltinType::Int: + case BuiltinType::UInt: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getInt32Ty(getVMContext()), 4); + break; + case BuiltinType::Long: + case BuiltinType::ULong: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getInt64Ty(getVMContext()), 2); + break; + case BuiltinType::Half: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getHalfTy(getVMContext()), 8); + break; + case BuiltinType::Float: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getFloatTy(getVMContext()), 4); + break; + case BuiltinType::Double: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getDoubleTy(getVMContext()), 2); + break; + case BuiltinType::BFloat16: + ResType = llvm::ScalableVectorType::get( + llvm::Type::getBFloatTy(getVMContext()), 8); + break; + } + return ABIArgInfo::getDirect(ResType); + } + + uint64_t Size = getContext().getTypeSize(Ty); + // Android promotes <2 x i8> to i16, not i32 + if ((isAndroid() || isOHOSFamily()) && (Size <= 16)) { + llvm::Type *ResType = llvm::Type::getInt16Ty(getVMContext()); + return ABIArgInfo::getDirect(ResType); + } + if (Size <= 32) { + llvm::Type *ResType = llvm::Type::getInt32Ty(getVMContext()); + return ABIArgInfo::getDirect(ResType); + } + if (Size == 64) { + auto *ResType = + llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 2); + return ABIArgInfo::getDirect(ResType); + } + if (Size == 128) { + auto *ResType = + llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 4); + return ABIArgInfo::getDirect(ResType); + } + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); +} + +ABIArgInfo +AArch64ABIInfo::classifyArgumentType(QualType Ty, bool IsVariadic, + unsigned CallingConvention) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + // Handle illegal vector types here. + if (isIllegalVectorType(Ty)) + return coerceIllegalVector(Ty); + + if (!isAggregateTypeForABI(Ty)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > 128) + return getNaturalAlignIndirect(Ty); + + return (isPromotableIntegerTypeForABI(Ty) && isDarwinPCS() + ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); + } + + // Structures with either a non-trivial destructor or a non-trivial + // copy constructor are always indirect. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { + return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == + CGCXXABI::RAA_DirectInMemory); + } + + // Empty records are always ignored on Darwin, but actually passed in C++ mode + // elsewhere for GNU compatibility. + uint64_t Size = getContext().getTypeSize(Ty); + bool IsEmpty = isEmptyRecord(getContext(), Ty, true); + if (IsEmpty || Size == 0) { + if (!getContext().getLangOpts().CPlusPlus || isDarwinPCS()) + return ABIArgInfo::getIgnore(); + + // GNU C mode. The only argument that gets ignored is an empty one with size + // 0. + if (IsEmpty && Size == 0) + return ABIArgInfo::getIgnore(); + return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); + } + + // Homogeneous Floating-point Aggregates (HFAs) need to be expanded. + const Type *Base = nullptr; + uint64_t Members = 0; + bool IsWin64 = Kind == AArch64ABIKind::Win64 || + CallingConvention == llvm::CallingConv::Win64; + bool IsWinVariadic = IsWin64 && IsVariadic; + // In variadic functions on Windows, all composite types are treated alike, + // no special handling of HFAs/HVAs. + if (!IsWinVariadic && isHomogeneousAggregate(Ty, Base, Members)) { + if (Kind != AArch64ABIKind::AAPCS) + return ABIArgInfo::getDirect( + llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members)); + + // For alignment adjusted HFAs, cap the argument alignment to 16, leave it + // default otherwise. + unsigned Align = + getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity(); + unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity(); + Align = (Align > BaseAlign && Align >= 16) ? 16 : 0; + return ABIArgInfo::getDirect( + llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members), 0, + nullptr, true, Align); + } + + // Aggregates <= 16 bytes are passed directly in registers or on the stack. + if (Size <= 128) { + // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of + // same size and alignment. + if (getTarget().isRenderScriptTarget()) { + return coerceToIntArray(Ty, getContext(), getVMContext()); + } + unsigned Alignment; + if (Kind == AArch64ABIKind::AAPCS) { + Alignment = getContext().getTypeUnadjustedAlign(Ty); + Alignment = Alignment < 128 ? 64 : 128; + } else { + Alignment = + std::max(getContext().getTypeAlign(Ty), + (unsigned)getTarget().getPointerWidth(LangAS::Default)); + } + Size = llvm::alignTo(Size, Alignment); + + // We use a pair of i64 for 16-byte aggregate with 8-byte alignment. + // For aggregates with 16-byte alignment, we use i128. + llvm::Type *BaseTy = llvm::Type::getIntNTy(getVMContext(), Alignment); + return ABIArgInfo::getDirect( + Size == Alignment ? BaseTy + : llvm::ArrayType::get(BaseTy, Size / Alignment)); + } + + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); +} + +ABIArgInfo AArch64ABIInfo::classifyReturnType(QualType RetTy, + bool IsVariadic) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (const auto *VT = RetTy->getAs()) { + if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector || + VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) + return coerceIllegalVector(RetTy); + } + + // Large vector types should be returned via memory. + if (RetTy->isVectorType() && getContext().getTypeSize(RetTy) > 128) + return getNaturalAlignIndirect(RetTy); + + if (!isAggregateTypeForABI(RetTy)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > 128) + return getNaturalAlignIndirect(RetTy); + + return (isPromotableIntegerTypeForABI(RetTy) && isDarwinPCS() + ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); + } + + uint64_t Size = getContext().getTypeSize(RetTy); + if (isEmptyRecord(getContext(), RetTy, true) || Size == 0) + return ABIArgInfo::getIgnore(); + + const Type *Base = nullptr; + uint64_t Members = 0; + if (isHomogeneousAggregate(RetTy, Base, Members) && + !(getTarget().getTriple().getArch() == llvm::Triple::aarch64_32 && + IsVariadic)) + // Homogeneous Floating-point Aggregates (HFAs) are returned directly. + return ABIArgInfo::getDirect(); + + // Aggregates <= 16 bytes are returned directly in registers or on the stack. + if (Size <= 128) { + // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of + // same size and alignment. + if (getTarget().isRenderScriptTarget()) { + return coerceToIntArray(RetTy, getContext(), getVMContext()); + } + + if (Size <= 64 && getDataLayout().isLittleEndian()) { + // Composite types are returned in lower bits of a 64-bit register for LE, + // and in higher bits for BE. However, integer types are always returned + // in lower bits for both LE and BE, and they are not rounded up to + // 64-bits. We can skip rounding up of composite types for LE, but not for + // BE, otherwise composite types will be indistinguishable from integer + // types. + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), Size)); + } + + unsigned Alignment = getContext().getTypeAlign(RetTy); + Size = llvm::alignTo(Size, 64); // round up to multiple of 8 bytes + + // We use a pair of i64 for 16-byte aggregate with 8-byte alignment. + // For aggregates with 16-byte alignment, we use i128. + if (Alignment < 128 && Size == 128) { + llvm::Type *BaseTy = llvm::Type::getInt64Ty(getVMContext()); + return ABIArgInfo::getDirect(llvm::ArrayType::get(BaseTy, Size / 64)); + } + return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Size)); + } + + return getNaturalAlignIndirect(RetTy); +} + +/// isIllegalVectorType - check whether the vector type is legal for AArch64. +bool AArch64ABIInfo::isIllegalVectorType(QualType Ty) const { + if (const VectorType *VT = Ty->getAs()) { + // Check whether VT is a fixed-length SVE vector. These types are + // represented as scalable vectors in function args/return and must be + // coerced from fixed vectors. + if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector || + VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) + return true; + + // Check whether VT is legal. + unsigned NumElements = VT->getNumElements(); + uint64_t Size = getContext().getTypeSize(VT); + // NumElements should be power of 2. + if (!llvm::isPowerOf2_32(NumElements)) + return true; + + // arm64_32 has to be compatible with the ARM logic here, which allows huge + // vectors for some reason. + llvm::Triple Triple = getTarget().getTriple(); + if (Triple.getArch() == llvm::Triple::aarch64_32 && + Triple.isOSBinFormatMachO()) + return Size <= 32; + + return Size != 64 && (Size != 128 || NumElements == 1); + } + return false; +} + +bool AArch64SwiftABIInfo::isLegalVectorType(CharUnits VectorSize, + llvm::Type *EltTy, + unsigned NumElts) const { + if (!llvm::isPowerOf2_32(NumElts)) + return false; + if (VectorSize.getQuantity() != 8 && + (VectorSize.getQuantity() != 16 || NumElts == 1)) + return false; + return true; +} + +bool AArch64ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { + // Homogeneous aggregates for AAPCS64 must have base types of a floating + // point type or a short-vector type. This is the same as the 32-bit ABI, + // but with the difference that any floating-point type is allowed, + // including __fp16. + if (const BuiltinType *BT = Ty->getAs()) { + if (BT->isFloatingPoint()) + return true; + } else if (const VectorType *VT = Ty->getAs()) { + unsigned VecSize = getContext().getTypeSize(VT); + if (VecSize == 64 || VecSize == 128) + return true; + } + return false; +} + +bool AArch64ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base, + uint64_t Members) const { + return Members <= 4; +} + +bool AArch64ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() + const { + // AAPCS64 says that the rule for whether something is a homogeneous + // aggregate is applied to the output of the data layout decision. So + // anything that doesn't affect the data layout also does not affect + // homogeneity. In particular, zero-length bitfields don't stop a struct + // being homogeneous. + return true; +} + +Address AArch64ABIInfo::EmitAAPCSVAArg(Address VAListAddr, QualType Ty, + CodeGenFunction &CGF) const { + ABIArgInfo AI = classifyArgumentType(Ty, /*IsVariadic=*/true, + CGF.CurFnInfo->getCallingConvention()); + // Empty records are ignored for parameter passing purposes. + if (AI.isIgnore()) { + uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8; + CharUnits SlotSize = CharUnits::fromQuantity(PointerSize); + VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy); + auto *Load = CGF.Builder.CreateLoad(VAListAddr); + Address Addr = Address(Load, CGF.Int8Ty, SlotSize); + return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); + } + + bool IsIndirect = AI.isIndirect(); + + llvm::Type *BaseTy = CGF.ConvertType(Ty); + if (IsIndirect) + BaseTy = llvm::PointerType::getUnqual(BaseTy); + else if (AI.getCoerceToType()) + BaseTy = AI.getCoerceToType(); + + unsigned NumRegs = 1; + if (llvm::ArrayType *ArrTy = dyn_cast(BaseTy)) { + BaseTy = ArrTy->getElementType(); + NumRegs = ArrTy->getNumElements(); + } + bool IsFPR = BaseTy->isFloatingPointTy() || BaseTy->isVectorTy(); + + // The AArch64 va_list type and handling is specified in the Procedure Call + // Standard, section B.4: + // + // struct { + // void *__stack; + // void *__gr_top; + // void *__vr_top; + // int __gr_offs; + // int __vr_offs; + // }; + + llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg"); + llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); + llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack"); + llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); + + CharUnits TySize = getContext().getTypeSizeInChars(Ty); + CharUnits TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty); + + Address reg_offs_p = Address::invalid(); + llvm::Value *reg_offs = nullptr; + int reg_top_index; + int RegSize = IsIndirect ? 8 : TySize.getQuantity(); + if (!IsFPR) { + // 3 is the field number of __gr_offs + reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 3, "gr_offs_p"); + reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "gr_offs"); + reg_top_index = 1; // field number for __gr_top + RegSize = llvm::alignTo(RegSize, 8); + } else { + // 4 is the field number of __vr_offs. + reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 4, "vr_offs_p"); + reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "vr_offs"); + reg_top_index = 2; // field number for __vr_top + RegSize = 16 * NumRegs; + } + + //======================================= + // Find out where argument was passed + //======================================= + + // If reg_offs >= 0 we're already using the stack for this type of + // argument. We don't want to keep updating reg_offs (in case it overflows, + // though anyone passing 2GB of arguments, each at most 16 bytes, deserves + // whatever they get). + llvm::Value *UsingStack = nullptr; + UsingStack = CGF.Builder.CreateICmpSGE( + reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, 0)); + + CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, MaybeRegBlock); + + // Otherwise, at least some kind of argument could go in these registers, the + // question is whether this particular type is too big. + CGF.EmitBlock(MaybeRegBlock); + + // Integer arguments may need to correct register alignment (for example a + // "struct { __int128 a; };" gets passed in x_2N, x_{2N+1}). In this case we + // align __gr_offs to calculate the potential address. + if (!IsFPR && !IsIndirect && TyAlign.getQuantity() > 8) { + int Align = TyAlign.getQuantity(); + + reg_offs = CGF.Builder.CreateAdd( + reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, Align - 1), + "align_regoffs"); + reg_offs = CGF.Builder.CreateAnd( + reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, -Align), + "aligned_regoffs"); + } + + // Update the gr_offs/vr_offs pointer for next call to va_arg on this va_list. + // The fact that this is done unconditionally reflects the fact that + // allocating an argument to the stack also uses up all the remaining + // registers of the appropriate kind. + llvm::Value *NewOffset = nullptr; + NewOffset = CGF.Builder.CreateAdd( + reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, RegSize), "new_reg_offs"); + CGF.Builder.CreateStore(NewOffset, reg_offs_p); + + // Now we're in a position to decide whether this argument really was in + // registers or not. + llvm::Value *InRegs = nullptr; + InRegs = CGF.Builder.CreateICmpSLE( + NewOffset, llvm::ConstantInt::get(CGF.Int32Ty, 0), "inreg"); + + CGF.Builder.CreateCondBr(InRegs, InRegBlock, OnStackBlock); + + //======================================= + // Argument was in registers + //======================================= + + // Now we emit the code for if the argument was originally passed in + // registers. First start the appropriate block: + CGF.EmitBlock(InRegBlock); + + llvm::Value *reg_top = nullptr; + Address reg_top_p = + CGF.Builder.CreateStructGEP(VAListAddr, reg_top_index, "reg_top_p"); + reg_top = CGF.Builder.CreateLoad(reg_top_p, "reg_top"); + Address BaseAddr(CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, reg_top, reg_offs), + CGF.Int8Ty, CharUnits::fromQuantity(IsFPR ? 16 : 8)); + Address RegAddr = Address::invalid(); + llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty), *ElementTy = MemTy; + + if (IsIndirect) { + // If it's been passed indirectly (actually a struct), whatever we find from + // stored registers or on the stack will actually be a struct **. + MemTy = llvm::PointerType::getUnqual(MemTy); + } + + const Type *Base = nullptr; + uint64_t NumMembers = 0; + bool IsHFA = isHomogeneousAggregate(Ty, Base, NumMembers); + if (IsHFA && NumMembers > 1) { + // Homogeneous aggregates passed in registers will have their elements split + // and stored 16-bytes apart regardless of size (they're notionally in qN, + // qN+1, ...). We reload and store into a temporary local variable + // contiguously. + assert(!IsIndirect && "Homogeneous aggregates should be passed directly"); + auto BaseTyInfo = getContext().getTypeInfoInChars(QualType(Base, 0)); + llvm::Type *BaseTy = CGF.ConvertType(QualType(Base, 0)); + llvm::Type *HFATy = llvm::ArrayType::get(BaseTy, NumMembers); + Address Tmp = CGF.CreateTempAlloca(HFATy, + std::max(TyAlign, BaseTyInfo.Align)); + + // On big-endian platforms, the value will be right-aligned in its slot. + int Offset = 0; + if (CGF.CGM.getDataLayout().isBigEndian() && + BaseTyInfo.Width.getQuantity() < 16) + Offset = 16 - BaseTyInfo.Width.getQuantity(); + + for (unsigned i = 0; i < NumMembers; ++i) { + CharUnits BaseOffset = CharUnits::fromQuantity(16 * i + Offset); + Address LoadAddr = + CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, BaseOffset); + LoadAddr = CGF.Builder.CreateElementBitCast(LoadAddr, BaseTy); + + Address StoreAddr = CGF.Builder.CreateConstArrayGEP(Tmp, i); + + llvm::Value *Elem = CGF.Builder.CreateLoad(LoadAddr); + CGF.Builder.CreateStore(Elem, StoreAddr); + } + + RegAddr = CGF.Builder.CreateElementBitCast(Tmp, MemTy); + } else { + // Otherwise the object is contiguous in memory. + + // It might be right-aligned in its slot. + CharUnits SlotSize = BaseAddr.getAlignment(); + if (CGF.CGM.getDataLayout().isBigEndian() && !IsIndirect && + (IsHFA || !isAggregateTypeForABI(Ty)) && + TySize < SlotSize) { + CharUnits Offset = SlotSize - TySize; + BaseAddr = CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, Offset); + } + + RegAddr = CGF.Builder.CreateElementBitCast(BaseAddr, MemTy); + } + + CGF.EmitBranch(ContBlock); + + //======================================= + // Argument was on the stack + //======================================= + CGF.EmitBlock(OnStackBlock); + + Address stack_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "stack_p"); + llvm::Value *OnStackPtr = CGF.Builder.CreateLoad(stack_p, "stack"); + + // Again, stack arguments may need realignment. In this case both integer and + // floating-point ones might be affected. + if (!IsIndirect && TyAlign.getQuantity() > 8) { + int Align = TyAlign.getQuantity(); + + OnStackPtr = CGF.Builder.CreatePtrToInt(OnStackPtr, CGF.Int64Ty); + + OnStackPtr = CGF.Builder.CreateAdd( + OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, Align - 1), + "align_stack"); + OnStackPtr = CGF.Builder.CreateAnd( + OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, -Align), + "align_stack"); + + OnStackPtr = CGF.Builder.CreateIntToPtr(OnStackPtr, CGF.Int8PtrTy); + } + Address OnStackAddr = Address(OnStackPtr, CGF.Int8Ty, + std::max(CharUnits::fromQuantity(8), TyAlign)); + + // All stack slots are multiples of 8 bytes. + CharUnits StackSlotSize = CharUnits::fromQuantity(8); + CharUnits StackSize; + if (IsIndirect) + StackSize = StackSlotSize; + else + StackSize = TySize.alignTo(StackSlotSize); + + llvm::Value *StackSizeC = CGF.Builder.getSize(StackSize); + llvm::Value *NewStack = CGF.Builder.CreateInBoundsGEP( + CGF.Int8Ty, OnStackPtr, StackSizeC, "new_stack"); + + // Write the new value of __stack for the next call to va_arg + CGF.Builder.CreateStore(NewStack, stack_p); + + if (CGF.CGM.getDataLayout().isBigEndian() && !isAggregateTypeForABI(Ty) && + TySize < StackSlotSize) { + CharUnits Offset = StackSlotSize - TySize; + OnStackAddr = CGF.Builder.CreateConstInBoundsByteGEP(OnStackAddr, Offset); + } + + OnStackAddr = CGF.Builder.CreateElementBitCast(OnStackAddr, MemTy); + + CGF.EmitBranch(ContBlock); + + //======================================= + // Tidy up + //======================================= + CGF.EmitBlock(ContBlock); + + Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, OnStackAddr, + OnStackBlock, "vaargs.addr"); + + if (IsIndirect) + return Address(CGF.Builder.CreateLoad(ResAddr, "vaarg.addr"), ElementTy, + TyAlign); + + return ResAddr; +} + +Address AArch64ABIInfo::EmitDarwinVAArg(Address VAListAddr, QualType Ty, + CodeGenFunction &CGF) const { + // The backend's lowering doesn't support va_arg for aggregates or + // illegal vector types. Lower VAArg here for these cases and use + // the LLVM va_arg instruction for everything else. + if (!isAggregateTypeForABI(Ty) && !isIllegalVectorType(Ty)) + return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect()); + + uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8; + CharUnits SlotSize = CharUnits::fromQuantity(PointerSize); + + // Empty records are ignored for parameter passing purposes. + if (isEmptyRecord(getContext(), Ty, true)) { + Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr, "ap.cur"), + getVAListElementType(CGF), SlotSize); + Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); + return Addr; + } + + // The size of the actual thing passed, which might end up just + // being a pointer for indirect types. + auto TyInfo = getContext().getTypeInfoInChars(Ty); + + // Arguments bigger than 16 bytes which aren't homogeneous + // aggregates should be passed indirectly. + bool IsIndirect = false; + if (TyInfo.Width.getQuantity() > 16) { + const Type *Base = nullptr; + uint64_t Members = 0; + IsIndirect = !isHomogeneousAggregate(Ty, Base, Members); + } + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, + TyInfo, SlotSize, /*AllowHigherAlign*/ true); +} + +Address AArch64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + bool IsIndirect = false; + + // Composites larger than 16 bytes are passed by reference. + if (isAggregateTypeForABI(Ty) && getContext().getTypeSize(Ty) > 128) + IsIndirect = true; + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, + CGF.getContext().getTypeInfoInChars(Ty), + CharUnits::fromQuantity(8), + /*allowHigherAlign*/ false); +} + +std::unique_ptr +CodeGen::createAArch64TargetCodeGenInfo(CodeGenModule &CGM, + AArch64ABIKind Kind) { + return std::make_unique(CGM.getTypes(), Kind); +} + +std::unique_ptr +CodeGen::createWindowsAArch64TargetCodeGenInfo(CodeGenModule &CGM, + AArch64ABIKind K) { + return std::make_unique(CGM.getTypes(), K); +} diff --git a/clang/lib/CodeGen/Targets/AMDGPU.cpp b/clang/lib/CodeGen/Targets/AMDGPU.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/AMDGPU.cpp @@ -0,0 +1,601 @@ +//===- AMDGPU.cpp ---------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// AMDGPU ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class AMDGPUABIInfo final : public DefaultABIInfo { +private: + static const unsigned MaxNumRegsForArgsRet = 16; + + unsigned numRegsForType(QualType Ty) const; + + bool isHomogeneousAggregateBaseType(QualType Ty) const override; + bool isHomogeneousAggregateSmallEnough(const Type *Base, + uint64_t Members) const override; + + // Coerce HIP scalar pointer arguments from generic pointers to global ones. + llvm::Type *coerceKernelArgumentType(llvm::Type *Ty, unsigned FromAS, + unsigned ToAS) const { + // Single value types. + auto *PtrTy = llvm::dyn_cast(Ty); + if (PtrTy && PtrTy->getAddressSpace() == FromAS) + return llvm::PointerType::get(Ty->getContext(), ToAS); + return Ty; + } + +public: + explicit AMDGPUABIInfo(CodeGen::CodeGenTypes &CGT) : + DefaultABIInfo(CGT) {} + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyKernelArgumentType(QualType Ty) const; + ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegsLeft) const; + + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +bool AMDGPUABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { + return true; +} + +bool AMDGPUABIInfo::isHomogeneousAggregateSmallEnough( + const Type *Base, uint64_t Members) const { + uint32_t NumRegs = (getContext().getTypeSize(Base) + 31) / 32; + + // Homogeneous Aggregates may occupy at most 16 registers. + return Members * NumRegs <= MaxNumRegsForArgsRet; +} + +/// Estimate number of registers the type will use when passed in registers. +unsigned AMDGPUABIInfo::numRegsForType(QualType Ty) const { + unsigned NumRegs = 0; + + if (const VectorType *VT = Ty->getAs()) { + // Compute from the number of elements. The reported size is based on the + // in-memory size, which includes the padding 4th element for 3-vectors. + QualType EltTy = VT->getElementType(); + unsigned EltSize = getContext().getTypeSize(EltTy); + + // 16-bit element vectors should be passed as packed. + if (EltSize == 16) + return (VT->getNumElements() + 1) / 2; + + unsigned EltNumRegs = (EltSize + 31) / 32; + return EltNumRegs * VT->getNumElements(); + } + + if (const RecordType *RT = Ty->getAs()) { + const RecordDecl *RD = RT->getDecl(); + assert(!RD->hasFlexibleArrayMember()); + + for (const FieldDecl *Field : RD->fields()) { + QualType FieldTy = Field->getType(); + NumRegs += numRegsForType(FieldTy); + } + + return NumRegs; + } + + return (getContext().getTypeSize(Ty) + 31) / 32; +} + +void AMDGPUABIInfo::computeInfo(CGFunctionInfo &FI) const { + llvm::CallingConv::ID CC = FI.getCallingConvention(); + + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + + unsigned NumRegsLeft = MaxNumRegsForArgsRet; + for (auto &Arg : FI.arguments()) { + if (CC == llvm::CallingConv::AMDGPU_KERNEL) { + Arg.info = classifyKernelArgumentType(Arg.type); + } else { + Arg.info = classifyArgumentType(Arg.type, NumRegsLeft); + } + } +} + +Address AMDGPUABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + llvm_unreachable("AMDGPU does not support varargs"); +} + +ABIArgInfo AMDGPUABIInfo::classifyReturnType(QualType RetTy) const { + if (isAggregateTypeForABI(RetTy)) { + // Records with non-trivial destructors/copy-constructors should not be + // returned by value. + if (!getRecordArgABI(RetTy, getCXXABI())) { + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), RetTy, true)) + return ABIArgInfo::getIgnore(); + + // Lower single-element structs to just return a regular value. + if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext())) + return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); + + if (const RecordType *RT = RetTy->getAs()) { + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return DefaultABIInfo::classifyReturnType(RetTy); + } + + // Pack aggregates <= 4 bytes into single VGPR or pair. + uint64_t Size = getContext().getTypeSize(RetTy); + if (Size <= 16) + return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); + + if (Size <= 32) + return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); + + if (Size <= 64) { + llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext()); + return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2)); + } + + if (numRegsForType(RetTy) <= MaxNumRegsForArgsRet) + return ABIArgInfo::getDirect(); + } + } + + // Otherwise just do the default thing. + return DefaultABIInfo::classifyReturnType(RetTy); +} + +/// For kernels all parameters are really passed in a special buffer. It doesn't +/// make sense to pass anything byval, so everything must be direct. +ABIArgInfo AMDGPUABIInfo::classifyKernelArgumentType(QualType Ty) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + // TODO: Can we omit empty structs? + + if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) + Ty = QualType(SeltTy, 0); + + llvm::Type *OrigLTy = CGT.ConvertType(Ty); + llvm::Type *LTy = OrigLTy; + if (getContext().getLangOpts().HIP) { + LTy = coerceKernelArgumentType( + OrigLTy, /*FromAS=*/getContext().getTargetAddressSpace(LangAS::Default), + /*ToAS=*/getContext().getTargetAddressSpace(LangAS::cuda_device)); + } + + // FIXME: Should also use this for OpenCL, but it requires addressing the + // problem of kernels being called. + // + // FIXME: This doesn't apply the optimization of coercing pointers in structs + // to global address space when using byref. This would require implementing a + // new kind of coercion of the in-memory type when for indirect arguments. + if (!getContext().getLangOpts().OpenCL && LTy == OrigLTy && + isAggregateTypeForABI(Ty)) { + return ABIArgInfo::getIndirectAliased( + getContext().getTypeAlignInChars(Ty), + getContext().getTargetAddressSpace(LangAS::opencl_constant), + false /*Realign*/, nullptr /*Padding*/); + } + + // If we set CanBeFlattened to true, CodeGen will expand the struct to its + // individual elements, which confuses the Clover OpenCL backend; therefore we + // have to set it to false here. Other args of getDirect() are just defaults. + return ABIArgInfo::getDirect(LTy, 0, nullptr, false); +} + +ABIArgInfo AMDGPUABIInfo::classifyArgumentType(QualType Ty, + unsigned &NumRegsLeft) const { + assert(NumRegsLeft <= MaxNumRegsForArgsRet && "register estimate underflow"); + + Ty = useFirstFieldIfTransparentUnion(Ty); + + if (isAggregateTypeForABI(Ty)) { + // Records with non-trivial destructors/copy-constructors should not be + // passed by value. + if (auto RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + // Lower single-element structs to just pass a regular value. TODO: We + // could do reasonable-size multiple-element structs too, using getExpand(), + // though watch out for things like bitfields. + if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) + return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); + + if (const RecordType *RT = Ty->getAs()) { + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return DefaultABIInfo::classifyArgumentType(Ty); + } + + // Pack aggregates <= 8 bytes into single VGPR or pair. + uint64_t Size = getContext().getTypeSize(Ty); + if (Size <= 64) { + unsigned NumRegs = (Size + 31) / 32; + NumRegsLeft -= std::min(NumRegsLeft, NumRegs); + + if (Size <= 16) + return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); + + if (Size <= 32) + return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); + + // XXX: Should this be i64 instead, and should the limit increase? + llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext()); + return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2)); + } + + if (NumRegsLeft > 0) { + unsigned NumRegs = numRegsForType(Ty); + if (NumRegsLeft >= NumRegs) { + NumRegsLeft -= NumRegs; + return ABIArgInfo::getDirect(); + } + } + } + + // Otherwise just do the default thing. + ABIArgInfo ArgInfo = DefaultABIInfo::classifyArgumentType(Ty); + if (!ArgInfo.isIndirect()) { + unsigned NumRegs = numRegsForType(Ty); + NumRegsLeft -= std::min(NumRegs, NumRegsLeft); + } + + return ArgInfo; +} + +class AMDGPUTargetCodeGenInfo : public TargetCodeGenInfo { +public: + AMDGPUTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + + void setFunctionDeclAttributes(const FunctionDecl *FD, llvm::Function *F, + CodeGenModule &CGM) const; + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &M) const override; + unsigned getOpenCLKernelCallingConv() const override; + + llvm::Constant *getNullPointer(const CodeGen::CodeGenModule &CGM, + llvm::PointerType *T, QualType QT) const override; + + LangAS getASTAllocaAddressSpace() const override { + return getLangASFromTargetAS( + getABIInfo().getDataLayout().getAllocaAddrSpace()); + } + LangAS getGlobalVarAddressSpace(CodeGenModule &CGM, + const VarDecl *D) const override; + llvm::SyncScope::ID getLLVMSyncScopeID(const LangOptions &LangOpts, + SyncScope Scope, + llvm::AtomicOrdering Ordering, + llvm::LLVMContext &Ctx) const override; + llvm::Value *createEnqueuedBlockKernel(CodeGenFunction &CGF, + llvm::Function *BlockInvokeFunc, + llvm::Type *BlockTy) const override; + bool shouldEmitStaticExternCAliases() const override; + bool shouldEmitDWARFBitFieldSeparators() const override; + void setCUDAKernelCallingConvention(const FunctionType *&FT) const override; +}; +} + +static bool requiresAMDGPUProtectedVisibility(const Decl *D, + llvm::GlobalValue *GV) { + if (GV->getVisibility() != llvm::GlobalValue::HiddenVisibility) + return false; + + return D->hasAttr() || + (isa(D) && D->hasAttr()) || + (isa(D) && + (D->hasAttr() || D->hasAttr() || + cast(D)->getType()->isCUDADeviceBuiltinSurfaceType() || + cast(D)->getType()->isCUDADeviceBuiltinTextureType())); +} + +void AMDGPUTargetCodeGenInfo::setFunctionDeclAttributes( + const FunctionDecl *FD, llvm::Function *F, CodeGenModule &M) const { + const auto *ReqdWGS = + M.getLangOpts().OpenCL ? FD->getAttr() : nullptr; + const bool IsOpenCLKernel = + M.getLangOpts().OpenCL && FD->hasAttr(); + const bool IsHIPKernel = M.getLangOpts().HIP && FD->hasAttr(); + + const auto *FlatWGS = FD->getAttr(); + if (ReqdWGS || FlatWGS) { + unsigned Min = 0; + unsigned Max = 0; + if (FlatWGS) { + Min = FlatWGS->getMin() + ->EvaluateKnownConstInt(M.getContext()) + .getExtValue(); + Max = FlatWGS->getMax() + ->EvaluateKnownConstInt(M.getContext()) + .getExtValue(); + } + if (ReqdWGS && Min == 0 && Max == 0) + Min = Max = ReqdWGS->getXDim() * ReqdWGS->getYDim() * ReqdWGS->getZDim(); + + if (Min != 0) { + assert(Min <= Max && "Min must be less than or equal Max"); + + std::string AttrVal = llvm::utostr(Min) + "," + llvm::utostr(Max); + F->addFnAttr("amdgpu-flat-work-group-size", AttrVal); + } else + assert(Max == 0 && "Max must be zero"); + } else if (IsOpenCLKernel || IsHIPKernel) { + // By default, restrict the maximum size to a value specified by + // --gpu-max-threads-per-block=n or its default value for HIP. + const unsigned OpenCLDefaultMaxWorkGroupSize = 256; + const unsigned DefaultMaxWorkGroupSize = + IsOpenCLKernel ? OpenCLDefaultMaxWorkGroupSize + : M.getLangOpts().GPUMaxThreadsPerBlock; + std::string AttrVal = + std::string("1,") + llvm::utostr(DefaultMaxWorkGroupSize); + F->addFnAttr("amdgpu-flat-work-group-size", AttrVal); + } + + if (const auto *Attr = FD->getAttr()) { + unsigned Min = + Attr->getMin()->EvaluateKnownConstInt(M.getContext()).getExtValue(); + unsigned Max = Attr->getMax() ? Attr->getMax() + ->EvaluateKnownConstInt(M.getContext()) + .getExtValue() + : 0; + + if (Min != 0) { + assert((Max == 0 || Min <= Max) && "Min must be less than or equal Max"); + + std::string AttrVal = llvm::utostr(Min); + if (Max != 0) + AttrVal = AttrVal + "," + llvm::utostr(Max); + F->addFnAttr("amdgpu-waves-per-eu", AttrVal); + } else + assert(Max == 0 && "Max must be zero"); + } + + if (const auto *Attr = FD->getAttr()) { + unsigned NumSGPR = Attr->getNumSGPR(); + + if (NumSGPR != 0) + F->addFnAttr("amdgpu-num-sgpr", llvm::utostr(NumSGPR)); + } + + if (const auto *Attr = FD->getAttr()) { + uint32_t NumVGPR = Attr->getNumVGPR(); + + if (NumVGPR != 0) + F->addFnAttr("amdgpu-num-vgpr", llvm::utostr(NumVGPR)); + } +} + +void AMDGPUTargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { + if (requiresAMDGPUProtectedVisibility(D, GV)) { + GV->setVisibility(llvm::GlobalValue::ProtectedVisibility); + GV->setDSOLocal(true); + } + + if (GV->isDeclaration()) + return; + + llvm::Function *F = dyn_cast(GV); + if (!F) + return; + + const FunctionDecl *FD = dyn_cast_or_null(D); + if (FD) + setFunctionDeclAttributes(FD, F, M); + + const bool IsHIPKernel = + M.getLangOpts().HIP && FD && FD->hasAttr(); + + // TODO: This should be moved to language specific attributes instead. + if (IsHIPKernel) + F->addFnAttr("uniform-work-group-size", "true"); + + if (M.getContext().getTargetInfo().allowAMDGPUUnsafeFPAtomics()) + F->addFnAttr("amdgpu-unsafe-fp-atomics", "true"); + + if (!getABIInfo().getCodeGenOpts().EmitIEEENaNCompliantInsts) + F->addFnAttr("amdgpu-ieee", "false"); +} + +unsigned AMDGPUTargetCodeGenInfo::getOpenCLKernelCallingConv() const { + return llvm::CallingConv::AMDGPU_KERNEL; +} + +// Currently LLVM assumes null pointers always have value 0, +// which results in incorrectly transformed IR. Therefore, instead of +// emitting null pointers in private and local address spaces, a null +// pointer in generic address space is emitted which is casted to a +// pointer in local or private address space. +llvm::Constant *AMDGPUTargetCodeGenInfo::getNullPointer( + const CodeGen::CodeGenModule &CGM, llvm::PointerType *PT, + QualType QT) const { + if (CGM.getContext().getTargetNullPointerValue(QT) == 0) + return llvm::ConstantPointerNull::get(PT); + + auto &Ctx = CGM.getContext(); + auto NPT = llvm::PointerType::get( + PT->getContext(), Ctx.getTargetAddressSpace(LangAS::opencl_generic)); + return llvm::ConstantExpr::getAddrSpaceCast( + llvm::ConstantPointerNull::get(NPT), PT); +} + +LangAS +AMDGPUTargetCodeGenInfo::getGlobalVarAddressSpace(CodeGenModule &CGM, + const VarDecl *D) const { + assert(!CGM.getLangOpts().OpenCL && + !(CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) && + "Address space agnostic languages only"); + LangAS DefaultGlobalAS = getLangASFromTargetAS( + CGM.getContext().getTargetAddressSpace(LangAS::opencl_global)); + if (!D) + return DefaultGlobalAS; + + LangAS AddrSpace = D->getType().getAddressSpace(); + assert(AddrSpace == LangAS::Default || isTargetAddressSpace(AddrSpace)); + if (AddrSpace != LangAS::Default) + return AddrSpace; + + // Only promote to address space 4 if VarDecl has constant initialization. + if (CGM.isTypeConstant(D->getType(), false, false) && + D->hasConstantInitialization()) { + if (auto ConstAS = CGM.getTarget().getConstantAddressSpace()) + return *ConstAS; + } + return DefaultGlobalAS; +} + +llvm::SyncScope::ID +AMDGPUTargetCodeGenInfo::getLLVMSyncScopeID(const LangOptions &LangOpts, + SyncScope Scope, + llvm::AtomicOrdering Ordering, + llvm::LLVMContext &Ctx) const { + std::string Name; + switch (Scope) { + case SyncScope::HIPSingleThread: + Name = "singlethread"; + break; + case SyncScope::HIPWavefront: + case SyncScope::OpenCLSubGroup: + Name = "wavefront"; + break; + case SyncScope::HIPWorkgroup: + case SyncScope::OpenCLWorkGroup: + Name = "workgroup"; + break; + case SyncScope::HIPAgent: + case SyncScope::OpenCLDevice: + Name = "agent"; + break; + case SyncScope::HIPSystem: + case SyncScope::OpenCLAllSVMDevices: + Name = ""; + break; + } + + if (Ordering != llvm::AtomicOrdering::SequentiallyConsistent) { + if (!Name.empty()) + Name = Twine(Twine(Name) + Twine("-")).str(); + + Name = Twine(Twine(Name) + Twine("one-as")).str(); + } + + return Ctx.getOrInsertSyncScopeID(Name); +} + +bool AMDGPUTargetCodeGenInfo::shouldEmitStaticExternCAliases() const { + return false; +} + +bool AMDGPUTargetCodeGenInfo::shouldEmitDWARFBitFieldSeparators() const { + return true; +} + +void AMDGPUTargetCodeGenInfo::setCUDAKernelCallingConvention( + const FunctionType *&FT) const { + FT = getABIInfo().getContext().adjustFunctionType( + FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel)); +} + +/// Create an OpenCL kernel for an enqueued block. +/// +/// The type of the first argument (the block literal) is the struct type +/// of the block literal instead of a pointer type. The first argument +/// (block literal) is passed directly by value to the kernel. The kernel +/// allocates the same type of struct on stack and stores the block literal +/// to it and passes its pointer to the block invoke function. The kernel +/// has "enqueued-block" function attribute and kernel argument metadata. +llvm::Value *AMDGPUTargetCodeGenInfo::createEnqueuedBlockKernel( + CodeGenFunction &CGF, llvm::Function *Invoke, llvm::Type *BlockTy) const { + auto &Builder = CGF.Builder; + auto &C = CGF.getLLVMContext(); + + auto *InvokeFT = Invoke->getFunctionType(); + llvm::SmallVector ArgTys; + llvm::SmallVector AddressQuals; + llvm::SmallVector AccessQuals; + llvm::SmallVector ArgTypeNames; + llvm::SmallVector ArgBaseTypeNames; + llvm::SmallVector ArgTypeQuals; + llvm::SmallVector ArgNames; + + ArgTys.push_back(BlockTy); + ArgTypeNames.push_back(llvm::MDString::get(C, "__block_literal")); + AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(0))); + ArgBaseTypeNames.push_back(llvm::MDString::get(C, "__block_literal")); + ArgTypeQuals.push_back(llvm::MDString::get(C, "")); + AccessQuals.push_back(llvm::MDString::get(C, "none")); + ArgNames.push_back(llvm::MDString::get(C, "block_literal")); + for (unsigned I = 1, E = InvokeFT->getNumParams(); I < E; ++I) { + ArgTys.push_back(InvokeFT->getParamType(I)); + ArgTypeNames.push_back(llvm::MDString::get(C, "void*")); + AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(3))); + AccessQuals.push_back(llvm::MDString::get(C, "none")); + ArgBaseTypeNames.push_back(llvm::MDString::get(C, "void*")); + ArgTypeQuals.push_back(llvm::MDString::get(C, "")); + ArgNames.push_back( + llvm::MDString::get(C, (Twine("local_arg") + Twine(I)).str())); + } + std::string Name = Invoke->getName().str() + "_kernel"; + auto *FT = llvm::FunctionType::get(llvm::Type::getVoidTy(C), ArgTys, false); + auto *F = llvm::Function::Create(FT, llvm::GlobalValue::InternalLinkage, Name, + &CGF.CGM.getModule()); + F->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL); + + llvm::AttrBuilder KernelAttrs(C); + // FIXME: The invoke isn't applying the right attributes either + // FIXME: This is missing setTargetAttributes + CGF.CGM.addDefaultFunctionDefinitionAttributes(KernelAttrs); + KernelAttrs.addAttribute("enqueued-block"); + F->addFnAttrs(KernelAttrs); + + auto IP = CGF.Builder.saveIP(); + auto *BB = llvm::BasicBlock::Create(C, "entry", F); + Builder.SetInsertPoint(BB); + const auto BlockAlign = CGF.CGM.getDataLayout().getPrefTypeAlign(BlockTy); + auto *BlockPtr = Builder.CreateAlloca(BlockTy, nullptr); + BlockPtr->setAlignment(BlockAlign); + Builder.CreateAlignedStore(F->arg_begin(), BlockPtr, BlockAlign); + auto *Cast = Builder.CreatePointerCast(BlockPtr, InvokeFT->getParamType(0)); + llvm::SmallVector Args; + Args.push_back(Cast); + for (llvm::Argument &A : llvm::drop_begin(F->args())) + Args.push_back(&A); + llvm::CallInst *call = Builder.CreateCall(Invoke, Args); + call->setCallingConv(Invoke->getCallingConv()); + Builder.CreateRetVoid(); + Builder.restoreIP(IP); + + F->setMetadata("kernel_arg_addr_space", llvm::MDNode::get(C, AddressQuals)); + F->setMetadata("kernel_arg_access_qual", llvm::MDNode::get(C, AccessQuals)); + F->setMetadata("kernel_arg_type", llvm::MDNode::get(C, ArgTypeNames)); + F->setMetadata("kernel_arg_base_type", + llvm::MDNode::get(C, ArgBaseTypeNames)); + F->setMetadata("kernel_arg_type_qual", llvm::MDNode::get(C, ArgTypeQuals)); + if (CGF.CGM.getCodeGenOpts().EmitOpenCLArgMetadata) + F->setMetadata("kernel_arg_name", llvm::MDNode::get(C, ArgNames)); + + return F; +} + +std::unique_ptr +CodeGen::createAMDGPUTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/ARC.cpp b/clang/lib/CodeGen/Targets/ARC.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/ARC.cpp @@ -0,0 +1,158 @@ +//===- ARC.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +// ARC ABI implementation. +namespace { + +class ARCABIInfo : public DefaultABIInfo { + struct CCState { + unsigned FreeRegs; + }; + +public: + using DefaultABIInfo::DefaultABIInfo; + +private: + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + void updateState(const ABIArgInfo &Info, QualType Ty, CCState &State) const { + if (!State.FreeRegs) + return; + if (Info.isIndirect() && Info.getInReg()) + State.FreeRegs--; + else if (Info.isDirect() && Info.getInReg()) { + unsigned sz = (getContext().getTypeSize(Ty) + 31) / 32; + if (sz < State.FreeRegs) + State.FreeRegs -= sz; + else + State.FreeRegs = 0; + } + } + + void computeInfo(CGFunctionInfo &FI) const override { + CCState State; + // ARC uses 8 registers to pass arguments. + State.FreeRegs = 8; + + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + updateState(FI.getReturnInfo(), FI.getReturnType(), State); + for (auto &I : FI.arguments()) { + I.info = classifyArgumentType(I.type, State.FreeRegs); + updateState(I.info, I.type, State); + } + } + + ABIArgInfo getIndirectByRef(QualType Ty, bool HasFreeRegs) const; + ABIArgInfo getIndirectByValue(QualType Ty) const; + ABIArgInfo classifyArgumentType(QualType Ty, uint8_t FreeRegs) const; + ABIArgInfo classifyReturnType(QualType RetTy) const; +}; + +class ARCTargetCodeGenInfo : public TargetCodeGenInfo { +public: + ARCTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} +}; + + +ABIArgInfo ARCABIInfo::getIndirectByRef(QualType Ty, bool HasFreeRegs) const { + return HasFreeRegs ? getNaturalAlignIndirectInReg(Ty) : + getNaturalAlignIndirect(Ty, false); +} + +ABIArgInfo ARCABIInfo::getIndirectByValue(QualType Ty) const { + // Compute the byval alignment. + const unsigned MinABIStackAlignInBytes = 4; + unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8; + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true, + TypeAlign > MinABIStackAlignInBytes); +} + +Address ARCABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false, + getContext().getTypeInfoInChars(Ty), + CharUnits::fromQuantity(4), true); +} + +ABIArgInfo ARCABIInfo::classifyArgumentType(QualType Ty, + uint8_t FreeRegs) const { + // Handle the generic C++ ABI. + const RecordType *RT = Ty->getAs(); + if (RT) { + CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()); + if (RAA == CGCXXABI::RAA_Indirect) + return getIndirectByRef(Ty, FreeRegs > 0); + + if (RAA == CGCXXABI::RAA_DirectInMemory) + return getIndirectByValue(Ty); + } + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + auto SizeInRegs = llvm::alignTo(getContext().getTypeSize(Ty), 32) / 32; + + if (isAggregateTypeForABI(Ty)) { + // Structures with flexible arrays are always indirect. + if (RT && RT->getDecl()->hasFlexibleArrayMember()) + return getIndirectByValue(Ty); + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + llvm::LLVMContext &LLVMContext = getVMContext(); + + llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext); + SmallVector Elements(SizeInRegs, Int32); + llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements); + + return FreeRegs >= SizeInRegs ? + ABIArgInfo::getDirectInReg(Result) : + ABIArgInfo::getDirect(Result, 0, nullptr, false); + } + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > 64) + return getIndirectByValue(Ty); + + return isPromotableIntegerTypeForABI(Ty) + ? (FreeRegs >= SizeInRegs ? ABIArgInfo::getExtendInReg(Ty) + : ABIArgInfo::getExtend(Ty)) + : (FreeRegs >= SizeInRegs ? ABIArgInfo::getDirectInReg() + : ABIArgInfo::getDirect()); +} + +ABIArgInfo ARCABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isAnyComplexType()) + return ABIArgInfo::getDirectInReg(); + + // Arguments of size > 4 registers are indirect. + auto RetSize = llvm::alignTo(getContext().getTypeSize(RetTy), 32) / 32; + if (RetSize > 4) + return getIndirectByRef(RetTy, /*HasFreeRegs*/ true); + + return DefaultABIInfo::classifyReturnType(RetTy); +} + +} // End anonymous namespace. + +std::unique_ptr +CodeGen::createARCTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/ARM.cpp b/clang/lib/CodeGen/Targets/ARM.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/ARM.cpp @@ -0,0 +1,820 @@ +//===- ARM.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// ARM ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class ARMABIInfo : public ABIInfo { + ARMABIKind Kind; + bool IsFloatABISoftFP; + +public: + ARMABIInfo(CodeGenTypes &CGT, ARMABIKind Kind) : ABIInfo(CGT), Kind(Kind) { + setCCs(); + IsFloatABISoftFP = CGT.getCodeGenOpts().FloatABI == "softfp" || + CGT.getCodeGenOpts().FloatABI == ""; // default + } + + bool isEABI() const { + switch (getTarget().getTriple().getEnvironment()) { + case llvm::Triple::Android: + case llvm::Triple::EABI: + case llvm::Triple::EABIHF: + case llvm::Triple::GNUEABI: + case llvm::Triple::GNUEABIHF: + case llvm::Triple::MuslEABI: + case llvm::Triple::MuslEABIHF: + return true; + default: + return getTarget().getTriple().isOHOSFamily(); + } + } + + bool isEABIHF() const { + switch (getTarget().getTriple().getEnvironment()) { + case llvm::Triple::EABIHF: + case llvm::Triple::GNUEABIHF: + case llvm::Triple::MuslEABIHF: + return true; + default: + return false; + } + } + + ARMABIKind getABIKind() const { return Kind; } + + bool allowBFloatArgsAndRet() const override { + return !IsFloatABISoftFP && getTarget().hasBFloat16Type(); + } + +private: + ABIArgInfo classifyReturnType(QualType RetTy, bool isVariadic, + unsigned functionCallConv) const; + ABIArgInfo classifyArgumentType(QualType RetTy, bool isVariadic, + unsigned functionCallConv) const; + ABIArgInfo classifyHomogeneousAggregate(QualType Ty, const Type *Base, + uint64_t Members) const; + ABIArgInfo coerceIllegalVector(QualType Ty) const; + bool isIllegalVectorType(QualType Ty) const; + bool containsAnyFP16Vectors(QualType Ty) const; + + bool isHomogeneousAggregateBaseType(QualType Ty) const override; + bool isHomogeneousAggregateSmallEnough(const Type *Ty, + uint64_t Members) const override; + bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override; + + bool isEffectivelyAAPCS_VFP(unsigned callConvention, bool acceptHalf) const; + + void computeInfo(CGFunctionInfo &FI) const override; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + llvm::CallingConv::ID getLLVMDefaultCC() const; + llvm::CallingConv::ID getABIDefaultCC() const; + void setCCs(); +}; + +class ARMSwiftABIInfo : public SwiftABIInfo { +public: + explicit ARMSwiftABIInfo(CodeGenTypes &CGT) + : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {} + + bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, + unsigned NumElts) const override; +}; + +class ARMTargetCodeGenInfo : public TargetCodeGenInfo { +public: + ARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K) + : TargetCodeGenInfo(std::make_unique(CGT, K)) { + SwiftInfo = std::make_unique(CGT); + } + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + return 13; + } + + StringRef getARCRetainAutoreleasedReturnValueMarker() const override { + return "mov\tr7, r7\t\t// marker for objc_retainAutoreleaseReturnValue"; + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4); + + // 0-15 are the 16 integer registers. + AssignToArrayRange(CGF.Builder, Address, Four8, 0, 15); + return false; + } + + unsigned getSizeOfUnwindException() const override { + if (getABIInfo().isEABI()) + return 88; + return TargetCodeGenInfo::getSizeOfUnwindException(); + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + if (GV->isDeclaration()) + return; + const FunctionDecl *FD = dyn_cast_or_null(D); + if (!FD) + return; + auto *Fn = cast(GV); + + if (const auto *TA = FD->getAttr()) { + ParsedTargetAttr Attr = + CGM.getTarget().parseTargetAttr(TA->getFeaturesStr()); + if (!Attr.BranchProtection.empty()) { + TargetInfo::BranchProtectionInfo BPI; + StringRef DiagMsg; + StringRef Arch = + Attr.CPU.empty() ? CGM.getTarget().getTargetOpts().CPU : Attr.CPU; + if (!CGM.getTarget().validateBranchProtection(Attr.BranchProtection, + Arch, BPI, DiagMsg)) { + CGM.getDiags().Report( + D->getLocation(), + diag::warn_target_unsupported_branch_protection_attribute) + << Arch; + } else { + static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"}; + assert(static_cast(BPI.SignReturnAddr) <= 2 && + "Unexpected SignReturnAddressScopeKind"); + Fn->addFnAttr( + "sign-return-address", + SignReturnAddrStr[static_cast(BPI.SignReturnAddr)]); + + Fn->addFnAttr("branch-target-enforcement", + BPI.BranchTargetEnforcement ? "true" : "false"); + } + } else if (CGM.getLangOpts().BranchTargetEnforcement || + CGM.getLangOpts().hasSignReturnAddress()) { + // If the Branch Protection attribute is missing, validate the target + // Architecture attribute against Branch Protection command line + // settings. + if (!CGM.getTarget().isBranchProtectionSupportedArch(Attr.CPU)) + CGM.getDiags().Report( + D->getLocation(), + diag::warn_target_unsupported_branch_protection_attribute) + << Attr.CPU; + } + } + + const ARMInterruptAttr *Attr = FD->getAttr(); + if (!Attr) + return; + + const char *Kind; + switch (Attr->getInterrupt()) { + case ARMInterruptAttr::Generic: Kind = ""; break; + case ARMInterruptAttr::IRQ: Kind = "IRQ"; break; + case ARMInterruptAttr::FIQ: Kind = "FIQ"; break; + case ARMInterruptAttr::SWI: Kind = "SWI"; break; + case ARMInterruptAttr::ABORT: Kind = "ABORT"; break; + case ARMInterruptAttr::UNDEF: Kind = "UNDEF"; break; + } + + Fn->addFnAttr("interrupt", Kind); + + ARMABIKind ABI = getABIInfo().getABIKind(); + if (ABI == ARMABIKind::APCS) + return; + + // AAPCS guarantees that sp will be 8-byte aligned on any public interface, + // however this is not necessarily true on taking any interrupt. Instruct + // the backend to perform a realignment as part of the function prologue. + llvm::AttrBuilder B(Fn->getContext()); + B.addStackAlignmentAttr(8); + Fn->addFnAttrs(B); + } +}; + +class WindowsARMTargetCodeGenInfo : public ARMTargetCodeGenInfo { +public: + WindowsARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K) + : ARMTargetCodeGenInfo(CGT, K) {} + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override; + + void getDependentLibraryOption(llvm::StringRef Lib, + llvm::SmallString<24> &Opt) const override { + Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib); + } + + void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value, + llvm::SmallString<32> &Opt) const override { + Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; + } +}; + +void WindowsARMTargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { + ARMTargetCodeGenInfo::setTargetAttributes(D, GV, CGM); + if (GV->isDeclaration()) + return; + addStackProbeTargetAttributes(D, GV, CGM); +} +} + +void ARMABIInfo::computeInfo(CGFunctionInfo &FI) const { + if (!::classifyReturnType(getCXXABI(), FI, *this)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), FI.isVariadic(), + FI.getCallingConvention()); + + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type, FI.isVariadic(), + FI.getCallingConvention()); + + + // Always honor user-specified calling convention. + if (FI.getCallingConvention() != llvm::CallingConv::C) + return; + + llvm::CallingConv::ID cc = getRuntimeCC(); + if (cc != llvm::CallingConv::C) + FI.setEffectiveCallingConvention(cc); +} + +/// Return the default calling convention that LLVM will use. +llvm::CallingConv::ID ARMABIInfo::getLLVMDefaultCC() const { + // The default calling convention that LLVM will infer. + if (isEABIHF() || getTarget().getTriple().isWatchABI()) + return llvm::CallingConv::ARM_AAPCS_VFP; + else if (isEABI()) + return llvm::CallingConv::ARM_AAPCS; + else + return llvm::CallingConv::ARM_APCS; +} + +/// Return the calling convention that our ABI would like us to use +/// as the C calling convention. +llvm::CallingConv::ID ARMABIInfo::getABIDefaultCC() const { + switch (getABIKind()) { + case ARMABIKind::APCS: + return llvm::CallingConv::ARM_APCS; + case ARMABIKind::AAPCS: + return llvm::CallingConv::ARM_AAPCS; + case ARMABIKind::AAPCS_VFP: + return llvm::CallingConv::ARM_AAPCS_VFP; + case ARMABIKind::AAPCS16_VFP: + return llvm::CallingConv::ARM_AAPCS_VFP; + } + llvm_unreachable("bad ABI kind"); +} + +void ARMABIInfo::setCCs() { + assert(getRuntimeCC() == llvm::CallingConv::C); + + // Don't muddy up the IR with a ton of explicit annotations if + // they'd just match what LLVM will infer from the triple. + llvm::CallingConv::ID abiCC = getABIDefaultCC(); + if (abiCC != getLLVMDefaultCC()) + RuntimeCC = abiCC; +} + +ABIArgInfo ARMABIInfo::coerceIllegalVector(QualType Ty) const { + uint64_t Size = getContext().getTypeSize(Ty); + if (Size <= 32) { + llvm::Type *ResType = + llvm::Type::getInt32Ty(getVMContext()); + return ABIArgInfo::getDirect(ResType); + } + if (Size == 64 || Size == 128) { + auto *ResType = llvm::FixedVectorType::get( + llvm::Type::getInt32Ty(getVMContext()), Size / 32); + return ABIArgInfo::getDirect(ResType); + } + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); +} + +ABIArgInfo ARMABIInfo::classifyHomogeneousAggregate(QualType Ty, + const Type *Base, + uint64_t Members) const { + assert(Base && "Base class should be set for homogeneous aggregate"); + // Base can be a floating-point or a vector. + if (const VectorType *VT = Base->getAs()) { + // FP16 vectors should be converted to integer vectors + if (!getTarget().hasLegalHalfType() && containsAnyFP16Vectors(Ty)) { + uint64_t Size = getContext().getTypeSize(VT); + auto *NewVecTy = llvm::FixedVectorType::get( + llvm::Type::getInt32Ty(getVMContext()), Size / 32); + llvm::Type *Ty = llvm::ArrayType::get(NewVecTy, Members); + return ABIArgInfo::getDirect(Ty, 0, nullptr, false); + } + } + unsigned Align = 0; + if (getABIKind() == ARMABIKind::AAPCS || + getABIKind() == ARMABIKind::AAPCS_VFP) { + // For alignment adjusted HFAs, cap the argument alignment to 8, leave it + // default otherwise. + Align = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity(); + unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity(); + Align = (Align > BaseAlign && Align >= 8) ? 8 : 0; + } + return ABIArgInfo::getDirect(nullptr, 0, nullptr, false, Align); +} + +ABIArgInfo ARMABIInfo::classifyArgumentType(QualType Ty, bool isVariadic, + unsigned functionCallConv) const { + // 6.1.2.1 The following argument types are VFP CPRCs: + // A single-precision floating-point type (including promoted + // half-precision types); A double-precision floating-point type; + // A 64-bit or 128-bit containerized vector type; Homogeneous Aggregate + // with a Base Type of a single- or double-precision floating-point type, + // 64-bit containerized vectors or 128-bit containerized vectors with one + // to four Elements. + // Variadic functions should always marshal to the base standard. + bool IsAAPCS_VFP = + !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv, /* AAPCS16 */ false); + + Ty = useFirstFieldIfTransparentUnion(Ty); + + // Handle illegal vector types here. + if (isIllegalVectorType(Ty)) + return coerceIllegalVector(Ty); + + if (!isAggregateTypeForABI(Ty)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) { + Ty = EnumTy->getDecl()->getIntegerType(); + } + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > 64) + return getNaturalAlignIndirect(Ty, /*ByVal=*/true); + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); + } + + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + } + + // Ignore empty records. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + if (IsAAPCS_VFP) { + // Homogeneous Aggregates need to be expanded when we can fit the aggregate + // into VFP registers. + const Type *Base = nullptr; + uint64_t Members = 0; + if (isHomogeneousAggregate(Ty, Base, Members)) + return classifyHomogeneousAggregate(Ty, Base, Members); + } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) { + // WatchOS does have homogeneous aggregates. Note that we intentionally use + // this convention even for a variadic function: the backend will use GPRs + // if needed. + const Type *Base = nullptr; + uint64_t Members = 0; + if (isHomogeneousAggregate(Ty, Base, Members)) { + assert(Base && Members <= 4 && "unexpected homogeneous aggregate"); + llvm::Type *Ty = + llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members); + return ABIArgInfo::getDirect(Ty, 0, nullptr, false); + } + } + + if (getABIKind() == ARMABIKind::AAPCS16_VFP && + getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(16)) { + // WatchOS is adopting the 64-bit AAPCS rule on composite types: if they're + // bigger than 128-bits, they get placed in space allocated by the caller, + // and a pointer is passed. + return ABIArgInfo::getIndirect( + CharUnits::fromQuantity(getContext().getTypeAlign(Ty) / 8), false); + } + + // Support byval for ARM. + // The ABI alignment for APCS is 4-byte and for AAPCS at least 4-byte and at + // most 8-byte. We realign the indirect argument if type alignment is bigger + // than ABI alignment. + uint64_t ABIAlign = 4; + uint64_t TyAlign; + if (getABIKind() == ARMABIKind::AAPCS_VFP || + getABIKind() == ARMABIKind::AAPCS) { + TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity(); + ABIAlign = std::clamp(TyAlign, (uint64_t)4, (uint64_t)8); + } else { + TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity(); + } + if (getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(64)) { + assert(getABIKind() != ARMABIKind::AAPCS16_VFP && "unexpected byval"); + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign), + /*ByVal=*/true, + /*Realign=*/TyAlign > ABIAlign); + } + + // On RenderScript, coerce Aggregates <= 64 bytes to an integer array of + // same size and alignment. + if (getTarget().isRenderScriptTarget()) { + return coerceToIntArray(Ty, getContext(), getVMContext()); + } + + // Otherwise, pass by coercing to a structure of the appropriate size. + llvm::Type* ElemTy; + unsigned SizeRegs; + // FIXME: Try to match the types of the arguments more accurately where + // we can. + if (TyAlign <= 4) { + ElemTy = llvm::Type::getInt32Ty(getVMContext()); + SizeRegs = (getContext().getTypeSize(Ty) + 31) / 32; + } else { + ElemTy = llvm::Type::getInt64Ty(getVMContext()); + SizeRegs = (getContext().getTypeSize(Ty) + 63) / 64; + } + + return ABIArgInfo::getDirect(llvm::ArrayType::get(ElemTy, SizeRegs)); +} + +static bool isIntegerLikeType(QualType Ty, ASTContext &Context, + llvm::LLVMContext &VMContext) { + // APCS, C Language Calling Conventions, Non-Simple Return Values: A structure + // is called integer-like if its size is less than or equal to one word, and + // the offset of each of its addressable sub-fields is zero. + + uint64_t Size = Context.getTypeSize(Ty); + + // Check that the type fits in a word. + if (Size > 32) + return false; + + // FIXME: Handle vector types! + if (Ty->isVectorType()) + return false; + + // Float types are never treated as "integer like". + if (Ty->isRealFloatingType()) + return false; + + // If this is a builtin or pointer type then it is ok. + if (Ty->getAs() || Ty->isPointerType()) + return true; + + // Small complex integer types are "integer like". + if (const ComplexType *CT = Ty->getAs()) + return isIntegerLikeType(CT->getElementType(), Context, VMContext); + + // Single element and zero sized arrays should be allowed, by the definition + // above, but they are not. + + // Otherwise, it must be a record type. + const RecordType *RT = Ty->getAs(); + if (!RT) return false; + + // Ignore records with flexible arrays. + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return false; + + // Check that all sub-fields are at offset 0, and are themselves "integer + // like". + const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); + + bool HadField = false; + unsigned idx = 0; + for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); + i != e; ++i, ++idx) { + const FieldDecl *FD = *i; + + // Bit-fields are not addressable, we only need to verify they are "integer + // like". We still have to disallow a subsequent non-bitfield, for example: + // struct { int : 0; int x } + // is non-integer like according to gcc. + if (FD->isBitField()) { + if (!RD->isUnion()) + HadField = true; + + if (!isIntegerLikeType(FD->getType(), Context, VMContext)) + return false; + + continue; + } + + // Check if this field is at offset 0. + if (Layout.getFieldOffset(idx) != 0) + return false; + + if (!isIntegerLikeType(FD->getType(), Context, VMContext)) + return false; + + // Only allow at most one field in a structure. This doesn't match the + // wording above, but follows gcc in situations with a field following an + // empty structure. + if (!RD->isUnion()) { + if (HadField) + return false; + + HadField = true; + } + } + + return true; +} + +ABIArgInfo ARMABIInfo::classifyReturnType(QualType RetTy, bool isVariadic, + unsigned functionCallConv) const { + + // Variadic functions should always marshal to the base standard. + bool IsAAPCS_VFP = + !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv, /* AAPCS16 */ true); + + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (const VectorType *VT = RetTy->getAs()) { + // Large vector types should be returned via memory. + if (getContext().getTypeSize(RetTy) > 128) + return getNaturalAlignIndirect(RetTy); + // TODO: FP16/BF16 vectors should be converted to integer vectors + // This check is similar to isIllegalVectorType - refactor? + if ((!getTarget().hasLegalHalfType() && + (VT->getElementType()->isFloat16Type() || + VT->getElementType()->isHalfType())) || + (IsFloatABISoftFP && + VT->getElementType()->isBFloat16Type())) + return coerceIllegalVector(RetTy); + } + + if (!isAggregateTypeForABI(RetTy)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > 64) + return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); + + return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect(); + } + + // Are we following APCS? + if (getABIKind() == ARMABIKind::APCS) { + if (isEmptyRecord(getContext(), RetTy, false)) + return ABIArgInfo::getIgnore(); + + // Complex types are all returned as packed integers. + // + // FIXME: Consider using 2 x vector types if the back end handles them + // correctly. + if (RetTy->isAnyComplexType()) + return ABIArgInfo::getDirect(llvm::IntegerType::get( + getVMContext(), getContext().getTypeSize(RetTy))); + + // Integer like structures are returned in r0. + if (isIntegerLikeType(RetTy, getContext(), getVMContext())) { + // Return in the smallest viable integer type. + uint64_t Size = getContext().getTypeSize(RetTy); + if (Size <= 8) + return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); + if (Size <= 16) + return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); + return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); + } + + // Otherwise return in memory. + return getNaturalAlignIndirect(RetTy); + } + + // Otherwise this is an AAPCS variant. + + if (isEmptyRecord(getContext(), RetTy, true)) + return ABIArgInfo::getIgnore(); + + // Check for homogeneous aggregates with AAPCS-VFP. + if (IsAAPCS_VFP) { + const Type *Base = nullptr; + uint64_t Members = 0; + if (isHomogeneousAggregate(RetTy, Base, Members)) + return classifyHomogeneousAggregate(RetTy, Base, Members); + } + + // Aggregates <= 4 bytes are returned in r0; other aggregates + // are returned indirectly. + uint64_t Size = getContext().getTypeSize(RetTy); + if (Size <= 32) { + // On RenderScript, coerce Aggregates <= 4 bytes to an integer array of + // same size and alignment. + if (getTarget().isRenderScriptTarget()) { + return coerceToIntArray(RetTy, getContext(), getVMContext()); + } + if (getDataLayout().isBigEndian()) + // Return in 32 bit integer integer type (as if loaded by LDR, AAPCS 5.4) + return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); + + // Return in the smallest viable integer type. + if (Size <= 8) + return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); + if (Size <= 16) + return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext())); + return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext())); + } else if (Size <= 128 && getABIKind() == ARMABIKind::AAPCS16_VFP) { + llvm::Type *Int32Ty = llvm::Type::getInt32Ty(getVMContext()); + llvm::Type *CoerceTy = + llvm::ArrayType::get(Int32Ty, llvm::alignTo(Size, 32) / 32); + return ABIArgInfo::getDirect(CoerceTy); + } + + return getNaturalAlignIndirect(RetTy); +} + +/// isIllegalVector - check whether Ty is an illegal vector type. +bool ARMABIInfo::isIllegalVectorType(QualType Ty) const { + if (const VectorType *VT = Ty->getAs ()) { + // On targets that don't support half, fp16 or bfloat, they are expanded + // into float, and we don't want the ABI to depend on whether or not they + // are supported in hardware. Thus return false to coerce vectors of these + // types into integer vectors. + // We do not depend on hasLegalHalfType for bfloat as it is a + // separate IR type. + if ((!getTarget().hasLegalHalfType() && + (VT->getElementType()->isFloat16Type() || + VT->getElementType()->isHalfType())) || + (IsFloatABISoftFP && + VT->getElementType()->isBFloat16Type())) + return true; + if (isAndroid()) { + // Android shipped using Clang 3.1, which supported a slightly different + // vector ABI. The primary differences were that 3-element vector types + // were legal, and so were sub 32-bit vectors (i.e. <2 x i8>). This path + // accepts that legacy behavior for Android only. + // Check whether VT is legal. + unsigned NumElements = VT->getNumElements(); + // NumElements should be power of 2 or equal to 3. + if (!llvm::isPowerOf2_32(NumElements) && NumElements != 3) + return true; + } else { + // Check whether VT is legal. + unsigned NumElements = VT->getNumElements(); + uint64_t Size = getContext().getTypeSize(VT); + // NumElements should be power of 2. + if (!llvm::isPowerOf2_32(NumElements)) + return true; + // Size should be greater than 32 bits. + return Size <= 32; + } + } + return false; +} + +/// Return true if a type contains any 16-bit floating point vectors +bool ARMABIInfo::containsAnyFP16Vectors(QualType Ty) const { + if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) { + uint64_t NElements = AT->getSize().getZExtValue(); + if (NElements == 0) + return false; + return containsAnyFP16Vectors(AT->getElementType()); + } else if (const RecordType *RT = Ty->getAs()) { + const RecordDecl *RD = RT->getDecl(); + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) + if (llvm::any_of(CXXRD->bases(), [this](const CXXBaseSpecifier &B) { + return containsAnyFP16Vectors(B.getType()); + })) + return true; + + if (llvm::any_of(RD->fields(), [this](FieldDecl *FD) { + return FD && containsAnyFP16Vectors(FD->getType()); + })) + return true; + + return false; + } else { + if (const VectorType *VT = Ty->getAs()) + return (VT->getElementType()->isFloat16Type() || + VT->getElementType()->isBFloat16Type() || + VT->getElementType()->isHalfType()); + return false; + } +} + +bool ARMSwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy, + unsigned NumElts) const { + if (!llvm::isPowerOf2_32(NumElts)) + return false; + unsigned size = CGT.getDataLayout().getTypeStoreSizeInBits(EltTy); + if (size > 64) + return false; + if (VectorSize.getQuantity() != 8 && + (VectorSize.getQuantity() != 16 || NumElts == 1)) + return false; + return true; +} + +bool ARMABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { + // Homogeneous aggregates for AAPCS-VFP must have base types of float, + // double, or 64-bit or 128-bit vectors. + if (const BuiltinType *BT = Ty->getAs()) { + if (BT->getKind() == BuiltinType::Float || + BT->getKind() == BuiltinType::Double || + BT->getKind() == BuiltinType::LongDouble) + return true; + } else if (const VectorType *VT = Ty->getAs()) { + unsigned VecSize = getContext().getTypeSize(VT); + if (VecSize == 64 || VecSize == 128) + return true; + } + return false; +} + +bool ARMABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base, + uint64_t Members) const { + return Members <= 4; +} + +bool ARMABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const { + // AAPCS32 says that the rule for whether something is a homogeneous + // aggregate is applied to the output of the data layout decision. So + // anything that doesn't affect the data layout also does not affect + // homogeneity. In particular, zero-length bitfields don't stop a struct + // being homogeneous. + return true; +} + +bool ARMABIInfo::isEffectivelyAAPCS_VFP(unsigned callConvention, + bool acceptHalf) const { + // Give precedence to user-specified calling conventions. + if (callConvention != llvm::CallingConv::C) + return (callConvention == llvm::CallingConv::ARM_AAPCS_VFP); + else + return (getABIKind() == ARMABIKind::AAPCS_VFP) || + (acceptHalf && (getABIKind() == ARMABIKind::AAPCS16_VFP)); +} + +Address ARMABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + CharUnits SlotSize = CharUnits::fromQuantity(4); + + // Empty records are ignored for parameter passing purposes. + if (isEmptyRecord(getContext(), Ty, true)) { + VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy); + auto *Load = CGF.Builder.CreateLoad(VAListAddr); + Address Addr = Address(Load, CGF.Int8Ty, SlotSize); + return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); + } + + CharUnits TySize = getContext().getTypeSizeInChars(Ty); + CharUnits TyAlignForABI = getContext().getTypeUnadjustedAlignInChars(Ty); + + // Use indirect if size of the illegal vector is bigger than 16 bytes. + bool IsIndirect = false; + const Type *Base = nullptr; + uint64_t Members = 0; + if (TySize > CharUnits::fromQuantity(16) && isIllegalVectorType(Ty)) { + IsIndirect = true; + + // ARMv7k passes structs bigger than 16 bytes indirectly, in space + // allocated by the caller. + } else if (TySize > CharUnits::fromQuantity(16) && + getABIKind() == ARMABIKind::AAPCS16_VFP && + !isHomogeneousAggregate(Ty, Base, Members)) { + IsIndirect = true; + + // Otherwise, bound the type's ABI alignment. + // The ABI alignment for 64-bit or 128-bit vectors is 8 for AAPCS and 4 for + // APCS. For AAPCS, the ABI alignment is at least 4-byte and at most 8-byte. + // Our callers should be prepared to handle an under-aligned address. + } else if (getABIKind() == ARMABIKind::AAPCS_VFP || + getABIKind() == ARMABIKind::AAPCS) { + TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4)); + TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(8)); + } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) { + // ARMv7k allows type alignment up to 16 bytes. + TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4)); + TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(16)); + } else { + TyAlignForABI = CharUnits::fromQuantity(4); + } + + TypeInfoChars TyInfo(TySize, TyAlignForABI, AlignRequirementKind::None); + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TyInfo, + SlotSize, /*AllowHigherAlign*/ true); +} + +std::unique_ptr +CodeGen::createARMTargetCodeGenInfo(CodeGenModule &CGM, ARMABIKind Kind) { + return std::make_unique(CGM.getTypes(), Kind); +} + +std::unique_ptr +CodeGen::createWindowsARMTargetCodeGenInfo(CodeGenModule &CGM, ARMABIKind K) { + return std::make_unique(CGM.getTypes(), K); +} diff --git a/clang/lib/CodeGen/Targets/AVR.cpp b/clang/lib/CodeGen/Targets/AVR.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/AVR.cpp @@ -0,0 +1,154 @@ +//===- AVR.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" +#include "clang/Basic/DiagnosticFrontend.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// AVR ABI Implementation. Documented at +// https://gcc.gnu.org/wiki/avr-gcc#Calling_Convention +// https://gcc.gnu.org/wiki/avr-gcc#Reduced_Tiny +//===----------------------------------------------------------------------===// + +namespace { +class AVRABIInfo : public DefaultABIInfo { +private: + // The total amount of registers can be used to pass parameters. It is 18 on + // AVR, or 6 on AVRTiny. + const unsigned ParamRegs; + // The total amount of registers can be used to pass return value. It is 8 on + // AVR, or 4 on AVRTiny. + const unsigned RetRegs; + +public: + AVRABIInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR) + : DefaultABIInfo(CGT), ParamRegs(NPR), RetRegs(NRR) {} + + ABIArgInfo classifyReturnType(QualType Ty, bool &LargeRet) const { + // On AVR, a return struct with size less than or equals to 8 bytes is + // returned directly via registers R18-R25. On AVRTiny, a return struct + // with size less than or equals to 4 bytes is returned directly via + // registers R22-R25. + if (isAggregateTypeForABI(Ty) && + getContext().getTypeSize(Ty) <= RetRegs * 8) + return ABIArgInfo::getDirect(); + // A return value (struct or scalar) with larger size is returned via a + // stack slot, along with a pointer as the function's implicit argument. + if (getContext().getTypeSize(Ty) > RetRegs * 8) { + LargeRet = true; + return getNaturalAlignIndirect(Ty); + } + // An i8 return value should not be extended to i16, since AVR has 8-bit + // registers. + if (Ty->isIntegralOrEnumerationType() && getContext().getTypeSize(Ty) <= 8) + return ABIArgInfo::getDirect(); + // Otherwise we follow the default way which is compatible. + return DefaultABIInfo::classifyReturnType(Ty); + } + + ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegs) const { + unsigned TySize = getContext().getTypeSize(Ty); + + // An int8 type argument always costs two registers like an int16. + if (TySize == 8 && NumRegs >= 2) { + NumRegs -= 2; + return ABIArgInfo::getExtend(Ty); + } + + // If the argument size is an odd number of bytes, round up the size + // to the next even number. + TySize = llvm::alignTo(TySize, 16); + + // Any type including an array/struct type can be passed in rgisters, + // if there are enough registers left. + if (TySize <= NumRegs * 8) { + NumRegs -= TySize / 8; + return ABIArgInfo::getDirect(); + } + + // An argument is passed either completely in registers or completely in + // memory. Since there are not enough registers left, current argument + // and all other unprocessed arguments should be passed in memory. + // However we still need to return `ABIArgInfo::getDirect()` other than + // `ABIInfo::getNaturalAlignIndirect(Ty)`, otherwise an extra stack slot + // will be allocated, so the stack frame layout will be incompatible with + // avr-gcc. + NumRegs = 0; + return ABIArgInfo::getDirect(); + } + + void computeInfo(CGFunctionInfo &FI) const override { + // Decide the return type. + bool LargeRet = false; + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), LargeRet); + + // Decide each argument type. The total number of registers can be used for + // arguments depends on several factors: + // 1. Arguments of varargs functions are passed on the stack. This applies + // even to the named arguments. So no register can be used. + // 2. Total 18 registers can be used on avr and 6 ones on avrtiny. + // 3. If the return type is a struct with too large size, two registers + // (out of 18/6) will be cost as an implicit pointer argument. + unsigned NumRegs = ParamRegs; + if (FI.isVariadic()) + NumRegs = 0; + else if (LargeRet) + NumRegs -= 2; + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type, NumRegs); + } +}; + +class AVRTargetCodeGenInfo : public TargetCodeGenInfo { +public: + AVRTargetCodeGenInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR) + : TargetCodeGenInfo(std::make_unique(CGT, NPR, NRR)) {} + + LangAS getGlobalVarAddressSpace(CodeGenModule &CGM, + const VarDecl *D) const override { + // Check if global/static variable is defined in address space + // 1~6 (__flash, __flash1, __flash2, __flash3, __flash4, __flash5) + // but not constant. + if (D) { + LangAS AS = D->getType().getAddressSpace(); + if (isTargetAddressSpace(AS) && 1 <= toTargetAddressSpace(AS) && + toTargetAddressSpace(AS) <= 6 && !D->getType().isConstQualified()) + CGM.getDiags().Report(D->getLocation(), + diag::err_verify_nonconst_addrspace) + << "__flash*"; + } + return TargetCodeGenInfo::getGlobalVarAddressSpace(CGM, D); + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + if (GV->isDeclaration()) + return; + const auto *FD = dyn_cast_or_null(D); + if (!FD) return; + auto *Fn = cast(GV); + + if (FD->getAttr()) + Fn->addFnAttr("interrupt"); + + if (FD->getAttr()) + Fn->addFnAttr("signal"); + } +}; +} + +std::unique_ptr +CodeGen::createAVRTargetCodeGenInfo(CodeGenModule &CGM, unsigned NPR, + unsigned NRR) { + return std::make_unique(CGM.getTypes(), NPR, NRR); +} diff --git a/clang/lib/CodeGen/Targets/BPF.cpp b/clang/lib/CodeGen/Targets/BPF.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/BPF.cpp @@ -0,0 +1,100 @@ +//===- BPF.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// BPF ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class BPFABIInfo : public DefaultABIInfo { +public: + BPFABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + + ABIArgInfo classifyArgumentType(QualType Ty) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + if (isAggregateTypeForABI(Ty)) { + uint64_t Bits = getContext().getTypeSize(Ty); + if (Bits == 0) + return ABIArgInfo::getIgnore(); + + // If the aggregate needs 1 or 2 registers, do not use reference. + if (Bits <= 128) { + llvm::Type *CoerceTy; + if (Bits <= 64) { + CoerceTy = + llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8)); + } else { + llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), 64); + CoerceTy = llvm::ArrayType::get(RegTy, 2); + } + return ABIArgInfo::getDirect(CoerceTy); + } else { + return getNaturalAlignIndirect(Ty); + } + } + + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + ASTContext &Context = getContext(); + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty)) + return getNaturalAlignIndirect(Ty); + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); + } + + ABIArgInfo classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (isAggregateTypeForABI(RetTy)) + return getNaturalAlignIndirect(RetTy); + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + ASTContext &Context = getContext(); + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty)) + return getNaturalAlignIndirect(RetTy); + + // Caller will do necessary sign/zero extension. + return ABIArgInfo::getDirect(); + } + + void computeInfo(CGFunctionInfo &FI) const override { + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); + } + +}; + +class BPFTargetCodeGenInfo : public TargetCodeGenInfo { +public: + BPFTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} +}; + +} + +std::unique_ptr +CodeGen::createBPFTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/CSKY.cpp b/clang/lib/CodeGen/Targets/CSKY.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/CSKY.cpp @@ -0,0 +1,177 @@ +//===- CSKY.cpp -----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// CSKY ABI Implementation +//===----------------------------------------------------------------------===// +namespace { +class CSKYABIInfo : public DefaultABIInfo { + static const int NumArgGPRs = 4; + static const int NumArgFPRs = 4; + + static const unsigned XLen = 32; + unsigned FLen; + +public: + CSKYABIInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen) + : DefaultABIInfo(CGT), FLen(FLen) {} + + void computeInfo(CGFunctionInfo &FI) const override; + ABIArgInfo classifyArgumentType(QualType Ty, int &ArgGPRsLeft, + int &ArgFPRsLeft, + bool isReturnType = false) const; + ABIArgInfo classifyReturnType(QualType RetTy) const; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +} // end anonymous namespace + +void CSKYABIInfo::computeInfo(CGFunctionInfo &FI) const { + QualType RetTy = FI.getReturnType(); + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(RetTy); + + bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect; + + // We must track the number of GPRs used in order to conform to the CSKY + // ABI, as integer scalars passed in registers should have signext/zeroext + // when promoted. + int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs; + int ArgFPRsLeft = FLen ? NumArgFPRs : 0; + + for (auto &ArgInfo : FI.arguments()) { + ArgInfo.info = classifyArgumentType(ArgInfo.type, ArgGPRsLeft, ArgFPRsLeft); + } +} + +Address CSKYABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8); + + // Empty records are ignored for parameter passing purposes. + if (isEmptyRecord(getContext(), Ty, true)) { + Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr), + getVAListElementType(CGF), SlotSize); + Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); + return Addr; + } + + auto TInfo = getContext().getTypeInfoInChars(Ty); + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, false, TInfo, SlotSize, + /*AllowHigherAlign=*/true); +} + +ABIArgInfo CSKYABIInfo::classifyArgumentType(QualType Ty, int &ArgGPRsLeft, + int &ArgFPRsLeft, + bool isReturnType) const { + assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow"); + Ty = useFirstFieldIfTransparentUnion(Ty); + + // Structures with either a non-trivial destructor or a non-trivial + // copy constructor are always passed indirectly. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { + if (ArgGPRsLeft) + ArgGPRsLeft -= 1; + return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == + CGCXXABI::RAA_DirectInMemory); + } + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + if (!Ty->getAsUnionType()) + if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) + return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); + + uint64_t Size = getContext().getTypeSize(Ty); + // Pass floating point values via FPRs if possible. + if (Ty->isFloatingType() && !Ty->isComplexType() && FLen >= Size && + ArgFPRsLeft) { + ArgFPRsLeft--; + return ABIArgInfo::getDirect(); + } + + // Complex types for the hard float ABI must be passed direct rather than + // using CoerceAndExpand. + if (Ty->isComplexType() && FLen && !isReturnType) { + QualType EltTy = Ty->castAs()->getElementType(); + if (getContext().getTypeSize(EltTy) <= FLen) { + ArgFPRsLeft -= 2; + return ABIArgInfo::getDirect(); + } + } + + if (!isAggregateTypeForABI(Ty)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // All integral types are promoted to XLen width, unless passed on the + // stack. + if (Size < XLen && Ty->isIntegralOrEnumerationType()) + return ABIArgInfo::getExtend(Ty); + + if (const auto *EIT = Ty->getAs()) { + if (EIT->getNumBits() < XLen) + return ABIArgInfo::getExtend(Ty); + } + + return ABIArgInfo::getDirect(); + } + + // For argument type, the first 4*XLen parts of aggregate will be passed + // in registers, and the rest will be passed in stack. + // So we can coerce to integers directly and let backend handle it correctly. + // For return type, aggregate which <= 2*XLen will be returned in registers. + // Otherwise, aggregate will be returned indirectly. + if (!isReturnType || (isReturnType && Size <= 2 * XLen)) { + if (Size <= XLen) { + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), XLen)); + } else { + return ABIArgInfo::getDirect(llvm::ArrayType::get( + llvm::IntegerType::get(getVMContext(), XLen), (Size + 31) / XLen)); + } + } + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); +} + +ABIArgInfo CSKYABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + int ArgGPRsLeft = 2; + int ArgFPRsLeft = FLen ? 1 : 0; + + // The rules for return and argument types are the same, so defer to + // classifyArgumentType. + return classifyArgumentType(RetTy, ArgGPRsLeft, ArgFPRsLeft, true); +} + +namespace { +class CSKYTargetCodeGenInfo : public TargetCodeGenInfo { +public: + CSKYTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen) + : TargetCodeGenInfo(std::make_unique(CGT, FLen)) {} +}; +} // end anonymous namespace + +std::unique_ptr +CodeGen::createCSKYTargetCodeGenInfo(CodeGenModule &CGM, unsigned FLen) { + return std::make_unique(CGM.getTypes(), FLen); +} diff --git a/clang/lib/CodeGen/Targets/Hexagon.cpp b/clang/lib/CodeGen/Targets/Hexagon.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/Hexagon.cpp @@ -0,0 +1,426 @@ +//===- Hexagon.cpp --------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// Hexagon ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class HexagonABIInfo : public DefaultABIInfo { +public: + HexagonABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + +private: + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType RetTy, unsigned *RegsLeft) const; + + void computeInfo(CGFunctionInfo &FI) const override; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + Address EmitVAArgFromMemory(CodeGenFunction &CFG, Address VAListAddr, + QualType Ty) const; + Address EmitVAArgForHexagon(CodeGenFunction &CFG, Address VAListAddr, + QualType Ty) const; + Address EmitVAArgForHexagonLinux(CodeGenFunction &CFG, Address VAListAddr, + QualType Ty) const; +}; + +class HexagonTargetCodeGenInfo : public TargetCodeGenInfo { +public: + HexagonTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + return 29; + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &GCM) const override { + if (GV->isDeclaration()) + return; + const FunctionDecl *FD = dyn_cast_or_null(D); + if (!FD) + return; + } +}; + +} // namespace + +void HexagonABIInfo::computeInfo(CGFunctionInfo &FI) const { + unsigned RegsLeft = 6; + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type, &RegsLeft); +} + +static bool HexagonAdjustRegsLeft(uint64_t Size, unsigned *RegsLeft) { + assert(Size <= 64 && "Not expecting to pass arguments larger than 64 bits" + " through registers"); + + if (*RegsLeft == 0) + return false; + + if (Size <= 32) { + (*RegsLeft)--; + return true; + } + + if (2 <= (*RegsLeft & (~1U))) { + *RegsLeft = (*RegsLeft & (~1U)) - 2; + return true; + } + + // Next available register was r5 but candidate was greater than 32-bits so it + // has to go on the stack. However we still consume r5 + if (*RegsLeft == 1) + *RegsLeft = 0; + + return false; +} + +ABIArgInfo HexagonABIInfo::classifyArgumentType(QualType Ty, + unsigned *RegsLeft) const { + if (!isAggregateTypeForABI(Ty)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + uint64_t Size = getContext().getTypeSize(Ty); + if (Size <= 64) + HexagonAdjustRegsLeft(Size, RegsLeft); + + if (Size > 64 && Ty->isBitIntType()) + return getNaturalAlignIndirect(Ty, /*ByVal=*/true); + + return isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect(); + } + + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + // Ignore empty records. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + uint64_t Size = getContext().getTypeSize(Ty); + unsigned Align = getContext().getTypeAlign(Ty); + + if (Size > 64) + return getNaturalAlignIndirect(Ty, /*ByVal=*/true); + + if (HexagonAdjustRegsLeft(Size, RegsLeft)) + Align = Size <= 32 ? 32 : 64; + if (Size <= Align) { + // Pass in the smallest viable integer type. + Size = llvm::bit_ceil(Size); + return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size)); + } + return DefaultABIInfo::classifyArgumentType(Ty); +} + +ABIArgInfo HexagonABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + const TargetInfo &T = CGT.getTarget(); + uint64_t Size = getContext().getTypeSize(RetTy); + + if (RetTy->getAs()) { + // HVX vectors are returned in vector registers or register pairs. + if (T.hasFeature("hvx")) { + assert(T.hasFeature("hvx-length64b") || T.hasFeature("hvx-length128b")); + uint64_t VecSize = T.hasFeature("hvx-length64b") ? 64*8 : 128*8; + if (Size == VecSize || Size == 2*VecSize) + return ABIArgInfo::getDirectInReg(); + } + // Large vector types should be returned via memory. + if (Size > 64) + return getNaturalAlignIndirect(RetTy); + } + + if (!isAggregateTypeForABI(RetTy)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + if (Size > 64 && RetTy->isBitIntType()) + return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); + + return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect(); + } + + if (isEmptyRecord(getContext(), RetTy, true)) + return ABIArgInfo::getIgnore(); + + // Aggregates <= 8 bytes are returned in registers, other aggregates + // are returned indirectly. + if (Size <= 64) { + // Return in the smallest viable integer type. + Size = llvm::bit_ceil(Size); + return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size)); + } + return getNaturalAlignIndirect(RetTy, /*ByVal=*/true); +} + +Address HexagonABIInfo::EmitVAArgFromMemory(CodeGenFunction &CGF, + Address VAListAddr, + QualType Ty) const { + // Load the overflow area pointer. + Address __overflow_area_pointer_p = + CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p"); + llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad( + __overflow_area_pointer_p, "__overflow_area_pointer"); + + uint64_t Align = CGF.getContext().getTypeAlign(Ty) / 8; + if (Align > 4) { + // Alignment should be a power of 2. + assert((Align & (Align - 1)) == 0 && "Alignment is not power of 2!"); + + // overflow_arg_area = (overflow_arg_area + align - 1) & -align; + llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int64Ty, Align - 1); + + // Add offset to the current pointer to access the argument. + __overflow_area_pointer = + CGF.Builder.CreateGEP(CGF.Int8Ty, __overflow_area_pointer, Offset); + llvm::Value *AsInt = + CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty); + + // Create a mask which should be "AND"ed + // with (overflow_arg_area + align - 1) + llvm::Value *Mask = llvm::ConstantInt::get(CGF.Int32Ty, -(int)Align); + __overflow_area_pointer = CGF.Builder.CreateIntToPtr( + CGF.Builder.CreateAnd(AsInt, Mask), __overflow_area_pointer->getType(), + "__overflow_area_pointer.align"); + } + + // Get the type of the argument from memory and bitcast + // overflow area pointer to the argument type. + llvm::Type *PTy = CGF.ConvertTypeForMem(Ty); + Address AddrTyped = CGF.Builder.CreateElementBitCast( + Address(__overflow_area_pointer, CGF.Int8Ty, + CharUnits::fromQuantity(Align)), + PTy); + + // Round up to the minimum stack alignment for varargs which is 4 bytes. + uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4); + + __overflow_area_pointer = CGF.Builder.CreateGEP( + CGF.Int8Ty, __overflow_area_pointer, + llvm::ConstantInt::get(CGF.Int32Ty, Offset), + "__overflow_area_pointer.next"); + CGF.Builder.CreateStore(__overflow_area_pointer, __overflow_area_pointer_p); + + return AddrTyped; +} + +Address HexagonABIInfo::EmitVAArgForHexagon(CodeGenFunction &CGF, + Address VAListAddr, + QualType Ty) const { + // FIXME: Need to handle alignment + llvm::Type *BP = CGF.Int8PtrTy; + CGBuilderTy &Builder = CGF.Builder; + Address VAListAddrAsBPP = Builder.CreateElementBitCast(VAListAddr, BP, "ap"); + llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur"); + // Handle address alignment for type alignment > 32 bits + uint64_t TyAlign = CGF.getContext().getTypeAlign(Ty) / 8; + if (TyAlign > 4) { + assert((TyAlign & (TyAlign - 1)) == 0 && "Alignment is not power of 2!"); + llvm::Value *AddrAsInt = Builder.CreatePtrToInt(Addr, CGF.Int32Ty); + AddrAsInt = Builder.CreateAdd(AddrAsInt, Builder.getInt32(TyAlign - 1)); + AddrAsInt = Builder.CreateAnd(AddrAsInt, Builder.getInt32(~(TyAlign - 1))); + Addr = Builder.CreateIntToPtr(AddrAsInt, BP); + } + Address AddrTyped = Builder.CreateElementBitCast( + Address(Addr, CGF.Int8Ty, CharUnits::fromQuantity(TyAlign)), + CGF.ConvertType(Ty)); + + uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4); + llvm::Value *NextAddr = Builder.CreateGEP( + CGF.Int8Ty, Addr, llvm::ConstantInt::get(CGF.Int32Ty, Offset), "ap.next"); + Builder.CreateStore(NextAddr, VAListAddrAsBPP); + + return AddrTyped; +} + +Address HexagonABIInfo::EmitVAArgForHexagonLinux(CodeGenFunction &CGF, + Address VAListAddr, + QualType Ty) const { + int ArgSize = CGF.getContext().getTypeSize(Ty) / 8; + + if (ArgSize > 8) + return EmitVAArgFromMemory(CGF, VAListAddr, Ty); + + // Here we have check if the argument is in register area or + // in overflow area. + // If the saved register area pointer + argsize rounded up to alignment > + // saved register area end pointer, argument is in overflow area. + unsigned RegsLeft = 6; + Ty = CGF.getContext().getCanonicalType(Ty); + (void)classifyArgumentType(Ty, &RegsLeft); + + llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg"); + llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); + llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack"); + llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); + + // Get rounded size of the argument.GCC does not allow vararg of + // size < 4 bytes. We follow the same logic here. + ArgSize = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8; + int ArgAlign = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8; + + // Argument may be in saved register area + CGF.EmitBlock(MaybeRegBlock); + + // Load the current saved register area pointer. + Address __current_saved_reg_area_pointer_p = CGF.Builder.CreateStructGEP( + VAListAddr, 0, "__current_saved_reg_area_pointer_p"); + llvm::Value *__current_saved_reg_area_pointer = CGF.Builder.CreateLoad( + __current_saved_reg_area_pointer_p, "__current_saved_reg_area_pointer"); + + // Load the saved register area end pointer. + Address __saved_reg_area_end_pointer_p = CGF.Builder.CreateStructGEP( + VAListAddr, 1, "__saved_reg_area_end_pointer_p"); + llvm::Value *__saved_reg_area_end_pointer = CGF.Builder.CreateLoad( + __saved_reg_area_end_pointer_p, "__saved_reg_area_end_pointer"); + + // If the size of argument is > 4 bytes, check if the stack + // location is aligned to 8 bytes + if (ArgAlign > 4) { + + llvm::Value *__current_saved_reg_area_pointer_int = + CGF.Builder.CreatePtrToInt(__current_saved_reg_area_pointer, + CGF.Int32Ty); + + __current_saved_reg_area_pointer_int = CGF.Builder.CreateAdd( + __current_saved_reg_area_pointer_int, + llvm::ConstantInt::get(CGF.Int32Ty, (ArgAlign - 1)), + "align_current_saved_reg_area_pointer"); + + __current_saved_reg_area_pointer_int = + CGF.Builder.CreateAnd(__current_saved_reg_area_pointer_int, + llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign), + "align_current_saved_reg_area_pointer"); + + __current_saved_reg_area_pointer = + CGF.Builder.CreateIntToPtr(__current_saved_reg_area_pointer_int, + __current_saved_reg_area_pointer->getType(), + "align_current_saved_reg_area_pointer"); + } + + llvm::Value *__new_saved_reg_area_pointer = + CGF.Builder.CreateGEP(CGF.Int8Ty, __current_saved_reg_area_pointer, + llvm::ConstantInt::get(CGF.Int32Ty, ArgSize), + "__new_saved_reg_area_pointer"); + + llvm::Value *UsingStack = nullptr; + UsingStack = CGF.Builder.CreateICmpSGT(__new_saved_reg_area_pointer, + __saved_reg_area_end_pointer); + + CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, InRegBlock); + + // Argument in saved register area + // Implement the block where argument is in register saved area + CGF.EmitBlock(InRegBlock); + + llvm::Type *PTy = CGF.ConvertType(Ty); + llvm::Value *__saved_reg_area_p = CGF.Builder.CreateBitCast( + __current_saved_reg_area_pointer, llvm::PointerType::getUnqual(PTy)); + + CGF.Builder.CreateStore(__new_saved_reg_area_pointer, + __current_saved_reg_area_pointer_p); + + CGF.EmitBranch(ContBlock); + + // Argument in overflow area + // Implement the block where the argument is in overflow area. + CGF.EmitBlock(OnStackBlock); + + // Load the overflow area pointer + Address __overflow_area_pointer_p = + CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p"); + llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad( + __overflow_area_pointer_p, "__overflow_area_pointer"); + + // Align the overflow area pointer according to the alignment of the argument + if (ArgAlign > 4) { + llvm::Value *__overflow_area_pointer_int = + CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty); + + __overflow_area_pointer_int = + CGF.Builder.CreateAdd(__overflow_area_pointer_int, + llvm::ConstantInt::get(CGF.Int32Ty, ArgAlign - 1), + "align_overflow_area_pointer"); + + __overflow_area_pointer_int = + CGF.Builder.CreateAnd(__overflow_area_pointer_int, + llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign), + "align_overflow_area_pointer"); + + __overflow_area_pointer = CGF.Builder.CreateIntToPtr( + __overflow_area_pointer_int, __overflow_area_pointer->getType(), + "align_overflow_area_pointer"); + } + + // Get the pointer for next argument in overflow area and store it + // to overflow area pointer. + llvm::Value *__new_overflow_area_pointer = CGF.Builder.CreateGEP( + CGF.Int8Ty, __overflow_area_pointer, + llvm::ConstantInt::get(CGF.Int32Ty, ArgSize), + "__overflow_area_pointer.next"); + + CGF.Builder.CreateStore(__new_overflow_area_pointer, + __overflow_area_pointer_p); + + CGF.Builder.CreateStore(__new_overflow_area_pointer, + __current_saved_reg_area_pointer_p); + + // Bitcast the overflow area pointer to the type of argument. + llvm::Type *OverflowPTy = CGF.ConvertTypeForMem(Ty); + llvm::Value *__overflow_area_p = CGF.Builder.CreateBitCast( + __overflow_area_pointer, llvm::PointerType::getUnqual(OverflowPTy)); + + CGF.EmitBranch(ContBlock); + + // Get the correct pointer to load the variable argument + // Implement the ContBlock + CGF.EmitBlock(ContBlock); + + llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty); + llvm::Type *MemPTy = llvm::PointerType::getUnqual(MemTy); + llvm::PHINode *ArgAddr = CGF.Builder.CreatePHI(MemPTy, 2, "vaarg.addr"); + ArgAddr->addIncoming(__saved_reg_area_p, InRegBlock); + ArgAddr->addIncoming(__overflow_area_p, OnStackBlock); + + return Address(ArgAddr, MemTy, CharUnits::fromQuantity(ArgAlign)); +} + +Address HexagonABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + + if (getTarget().getTriple().isMusl()) + return EmitVAArgForHexagonLinux(CGF, VAListAddr, Ty); + + return EmitVAArgForHexagon(CGF, VAListAddr, Ty); +} + +std::unique_ptr +CodeGen::createHexagonTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/Lanai.cpp b/clang/lib/CodeGen/Targets/Lanai.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/Lanai.cpp @@ -0,0 +1,154 @@ +//===- Lanai.cpp ----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// Lanai ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { +class LanaiABIInfo : public DefaultABIInfo { + struct CCState { + unsigned FreeRegs; + }; + +public: + LanaiABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + + bool shouldUseInReg(QualType Ty, CCState &State) const; + + void computeInfo(CGFunctionInfo &FI) const override { + CCState State; + // Lanai uses 4 registers to pass arguments unless the function has the + // regparm attribute set. + if (FI.getHasRegParm()) { + State.FreeRegs = FI.getRegParm(); + } else { + State.FreeRegs = 4; + } + + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type, State); + } + + ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const; + ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const; +}; +} // end anonymous namespace + +bool LanaiABIInfo::shouldUseInReg(QualType Ty, CCState &State) const { + unsigned Size = getContext().getTypeSize(Ty); + unsigned SizeInRegs = llvm::alignTo(Size, 32U) / 32U; + + if (SizeInRegs == 0) + return false; + + if (SizeInRegs > State.FreeRegs) { + State.FreeRegs = 0; + return false; + } + + State.FreeRegs -= SizeInRegs; + + return true; +} + +ABIArgInfo LanaiABIInfo::getIndirectResult(QualType Ty, bool ByVal, + CCState &State) const { + if (!ByVal) { + if (State.FreeRegs) { + --State.FreeRegs; // Non-byval indirects just use one pointer. + return getNaturalAlignIndirectInReg(Ty); + } + return getNaturalAlignIndirect(Ty, false); + } + + // Compute the byval alignment. + const unsigned MinABIStackAlignInBytes = 4; + unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8; + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true, + /*Realign=*/TypeAlign > + MinABIStackAlignInBytes); +} + +ABIArgInfo LanaiABIInfo::classifyArgumentType(QualType Ty, + CCState &State) const { + // Check with the C++ ABI first. + const RecordType *RT = Ty->getAs(); + if (RT) { + CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()); + if (RAA == CGCXXABI::RAA_Indirect) { + return getIndirectResult(Ty, /*ByVal=*/false, State); + } else if (RAA == CGCXXABI::RAA_DirectInMemory) { + return getNaturalAlignIndirect(Ty, /*ByVal=*/true); + } + } + + if (isAggregateTypeForABI(Ty)) { + // Structures with flexible arrays are always indirect. + if (RT && RT->getDecl()->hasFlexibleArrayMember()) + return getIndirectResult(Ty, /*ByVal=*/true, State); + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + llvm::LLVMContext &LLVMContext = getVMContext(); + unsigned SizeInRegs = (getContext().getTypeSize(Ty) + 31) / 32; + if (SizeInRegs <= State.FreeRegs) { + llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext); + SmallVector Elements(SizeInRegs, Int32); + llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements); + State.FreeRegs -= SizeInRegs; + return ABIArgInfo::getDirectInReg(Result); + } else { + State.FreeRegs = 0; + } + return getIndirectResult(Ty, true, State); + } + + // Treat an enum type as its underlying type. + if (const auto *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + bool InReg = shouldUseInReg(Ty, State); + + // Don't pass >64 bit integers in registers. + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > 64) + return getIndirectResult(Ty, /*ByVal=*/true, State); + + if (isPromotableIntegerTypeForABI(Ty)) { + if (InReg) + return ABIArgInfo::getDirectInReg(); + return ABIArgInfo::getExtend(Ty); + } + if (InReg) + return ABIArgInfo::getDirectInReg(); + return ABIArgInfo::getDirect(); +} + +namespace { +class LanaiTargetCodeGenInfo : public TargetCodeGenInfo { +public: + LanaiTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} +}; +} + +std::unique_ptr +CodeGen::createLanaiTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/LoongArch.cpp b/clang/lib/CodeGen/Targets/LoongArch.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/LoongArch.cpp @@ -0,0 +1,452 @@ +//===- LoongArch.cpp ------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +// LoongArch ABI Implementation. Documented at +// https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html +// +//===----------------------------------------------------------------------===// + +namespace { +class LoongArchABIInfo : public DefaultABIInfo { +private: + // Size of the integer ('r') registers in bits. + unsigned GRLen; + // Size of the floating point ('f') registers in bits. + unsigned FRLen; + // Number of general-purpose argument registers. + static const int NumGARs = 8; + // Number of floating-point argument registers. + static const int NumFARs = 8; + bool detectFARsEligibleStructHelper(QualType Ty, CharUnits CurOff, + llvm::Type *&Field1Ty, + CharUnits &Field1Off, + llvm::Type *&Field2Ty, + CharUnits &Field2Off) const; + +public: + LoongArchABIInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen, unsigned FRLen) + : DefaultABIInfo(CGT), GRLen(GRLen), FRLen(FRLen) {} + + void computeInfo(CGFunctionInfo &FI) const override; + + ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &GARsLeft, + int &FARsLeft) const; + ABIArgInfo classifyReturnType(QualType RetTy) const; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + ABIArgInfo extendType(QualType Ty) const; + + bool detectFARsEligibleStruct(QualType Ty, llvm::Type *&Field1Ty, + CharUnits &Field1Off, llvm::Type *&Field2Ty, + CharUnits &Field2Off, int &NeededArgGPRs, + int &NeededArgFPRs) const; + ABIArgInfo coerceAndExpandFARsEligibleStruct(llvm::Type *Field1Ty, + CharUnits Field1Off, + llvm::Type *Field2Ty, + CharUnits Field2Off) const; +}; +} // end anonymous namespace + +void LoongArchABIInfo::computeInfo(CGFunctionInfo &FI) const { + QualType RetTy = FI.getReturnType(); + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(RetTy); + + // IsRetIndirect is true if classifyArgumentType indicated the value should + // be passed indirect, or if the type size is a scalar greater than 2*GRLen + // and not a complex type with elements <= FRLen. e.g. fp128 is passed direct + // in LLVM IR, relying on the backend lowering code to rewrite the argument + // list and pass indirectly on LA32. + bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect; + if (!IsRetIndirect && RetTy->isScalarType() && + getContext().getTypeSize(RetTy) > (2 * GRLen)) { + if (RetTy->isComplexType() && FRLen) { + QualType EltTy = RetTy->castAs()->getElementType(); + IsRetIndirect = getContext().getTypeSize(EltTy) > FRLen; + } else { + // This is a normal scalar > 2*GRLen, such as fp128 on LA32. + IsRetIndirect = true; + } + } + + // We must track the number of GARs and FARs used in order to conform to the + // LoongArch ABI. As GAR usage is different for variadic arguments, we must + // also track whether we are examining a vararg or not. + int GARsLeft = IsRetIndirect ? NumGARs - 1 : NumGARs; + int FARsLeft = FRLen ? NumFARs : 0; + int NumFixedArgs = FI.getNumRequiredArgs(); + + int ArgNum = 0; + for (auto &ArgInfo : FI.arguments()) { + ArgInfo.info = classifyArgumentType( + ArgInfo.type, /*IsFixed=*/ArgNum < NumFixedArgs, GARsLeft, FARsLeft); + ArgNum++; + } +} + +// Returns true if the struct is a potential candidate to be passed in FARs (and +// GARs). If this function returns true, the caller is responsible for checking +// that if there is only a single field then that field is a float. +bool LoongArchABIInfo::detectFARsEligibleStructHelper( + QualType Ty, CharUnits CurOff, llvm::Type *&Field1Ty, CharUnits &Field1Off, + llvm::Type *&Field2Ty, CharUnits &Field2Off) const { + bool IsInt = Ty->isIntegralOrEnumerationType(); + bool IsFloat = Ty->isRealFloatingType(); + + if (IsInt || IsFloat) { + uint64_t Size = getContext().getTypeSize(Ty); + if (IsInt && Size > GRLen) + return false; + // Can't be eligible if larger than the FP registers. Half precision isn't + // currently supported on LoongArch and the ABI hasn't been confirmed, so + // default to the integer ABI in that case. + if (IsFloat && (Size > FRLen || Size < 32)) + return false; + // Can't be eligible if an integer type was already found (int+int pairs + // are not eligible). + if (IsInt && Field1Ty && Field1Ty->isIntegerTy()) + return false; + if (!Field1Ty) { + Field1Ty = CGT.ConvertType(Ty); + Field1Off = CurOff; + return true; + } + if (!Field2Ty) { + Field2Ty = CGT.ConvertType(Ty); + Field2Off = CurOff; + return true; + } + return false; + } + + if (auto CTy = Ty->getAs()) { + if (Field1Ty) + return false; + QualType EltTy = CTy->getElementType(); + if (getContext().getTypeSize(EltTy) > FRLen) + return false; + Field1Ty = CGT.ConvertType(EltTy); + Field1Off = CurOff; + Field2Ty = Field1Ty; + Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy); + return true; + } + + if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) { + uint64_t ArraySize = ATy->getSize().getZExtValue(); + QualType EltTy = ATy->getElementType(); + CharUnits EltSize = getContext().getTypeSizeInChars(EltTy); + for (uint64_t i = 0; i < ArraySize; ++i) { + if (!detectFARsEligibleStructHelper(EltTy, CurOff, Field1Ty, Field1Off, + Field2Ty, Field2Off)) + return false; + CurOff += EltSize; + } + return true; + } + + if (const auto *RTy = Ty->getAs()) { + // Structures with either a non-trivial destructor or a non-trivial + // copy constructor are not eligible for the FP calling convention. + if (getRecordArgABI(Ty, CGT.getCXXABI())) + return false; + if (isEmptyRecord(getContext(), Ty, true)) + return true; + const RecordDecl *RD = RTy->getDecl(); + // Unions aren't eligible unless they're empty (which is caught above). + if (RD->isUnion()) + return false; + const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + for (const CXXBaseSpecifier &B : CXXRD->bases()) { + const auto *BDecl = + cast(B.getType()->castAs()->getDecl()); + if (!detectFARsEligibleStructHelper( + B.getType(), CurOff + Layout.getBaseClassOffset(BDecl), + Field1Ty, Field1Off, Field2Ty, Field2Off)) + return false; + } + } + for (const FieldDecl *FD : RD->fields()) { + QualType QTy = FD->getType(); + if (FD->isBitField()) { + unsigned BitWidth = FD->getBitWidthValue(getContext()); + // Zero-width bitfields are ignored. + if (BitWidth == 0) + continue; + // Allow a bitfield with a type greater than GRLen as long as the + // bitwidth is GRLen or less. + if (getContext().getTypeSize(QTy) > GRLen && BitWidth <= GRLen) { + QTy = getContext().getIntTypeForBitwidth(GRLen, false); + } + } + + if (!detectFARsEligibleStructHelper( + QTy, + CurOff + getContext().toCharUnitsFromBits( + Layout.getFieldOffset(FD->getFieldIndex())), + Field1Ty, Field1Off, Field2Ty, Field2Off)) + return false; + } + return Field1Ty != nullptr; + } + + return false; +} + +// Determine if a struct is eligible to be passed in FARs (and GARs) (i.e., when +// flattened it contains a single fp value, fp+fp, or int+fp of appropriate +// size). If so, NeededFARs and NeededGARs are incremented appropriately. +bool LoongArchABIInfo::detectFARsEligibleStruct( + QualType Ty, llvm::Type *&Field1Ty, CharUnits &Field1Off, + llvm::Type *&Field2Ty, CharUnits &Field2Off, int &NeededGARs, + int &NeededFARs) const { + Field1Ty = nullptr; + Field2Ty = nullptr; + NeededGARs = 0; + NeededFARs = 0; + if (!detectFARsEligibleStructHelper(Ty, CharUnits::Zero(), Field1Ty, + Field1Off, Field2Ty, Field2Off)) + return false; + // Not really a candidate if we have a single int but no float. + if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy()) + return false; + if (Field1Ty && Field1Ty->isFloatingPointTy()) + NeededFARs++; + else if (Field1Ty) + NeededGARs++; + if (Field2Ty && Field2Ty->isFloatingPointTy()) + NeededFARs++; + else if (Field2Ty) + NeededGARs++; + return true; +} + +// Call getCoerceAndExpand for the two-element flattened struct described by +// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an +// appropriate coerceToType and unpaddedCoerceToType. +ABIArgInfo LoongArchABIInfo::coerceAndExpandFARsEligibleStruct( + llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty, + CharUnits Field2Off) const { + SmallVector CoerceElts; + SmallVector UnpaddedCoerceElts; + if (!Field1Off.isZero()) + CoerceElts.push_back(llvm::ArrayType::get( + llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity())); + + CoerceElts.push_back(Field1Ty); + UnpaddedCoerceElts.push_back(Field1Ty); + + if (!Field2Ty) { + return ABIArgInfo::getCoerceAndExpand( + llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()), + UnpaddedCoerceElts[0]); + } + + CharUnits Field2Align = + CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty)); + CharUnits Field1End = + Field1Off + + CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty)); + CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align); + + CharUnits Padding = CharUnits::Zero(); + if (Field2Off > Field2OffNoPadNoPack) + Padding = Field2Off - Field2OffNoPadNoPack; + else if (Field2Off != Field2Align && Field2Off > Field1End) + Padding = Field2Off - Field1End; + + bool IsPacked = !Field2Off.isMultipleOf(Field2Align); + + if (!Padding.isZero()) + CoerceElts.push_back(llvm::ArrayType::get( + llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity())); + + CoerceElts.push_back(Field2Ty); + UnpaddedCoerceElts.push_back(Field2Ty); + + return ABIArgInfo::getCoerceAndExpand( + llvm::StructType::get(getVMContext(), CoerceElts, IsPacked), + llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked)); +} + +ABIArgInfo LoongArchABIInfo::classifyArgumentType(QualType Ty, bool IsFixed, + int &GARsLeft, + int &FARsLeft) const { + assert(GARsLeft <= NumGARs && "GAR tracking underflow"); + Ty = useFirstFieldIfTransparentUnion(Ty); + + // Structures with either a non-trivial destructor or a non-trivial + // copy constructor are always passed indirectly. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { + if (GARsLeft) + GARsLeft -= 1; + return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == + CGCXXABI::RAA_DirectInMemory); + } + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + uint64_t Size = getContext().getTypeSize(Ty); + + // Pass floating point values via FARs if possible. + if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() && + FRLen >= Size && FARsLeft) { + FARsLeft--; + return ABIArgInfo::getDirect(); + } + + // Complex types for the *f or *d ABI must be passed directly rather than + // using CoerceAndExpand. + if (IsFixed && Ty->isComplexType() && FRLen && FARsLeft >= 2) { + QualType EltTy = Ty->castAs()->getElementType(); + if (getContext().getTypeSize(EltTy) <= FRLen) { + FARsLeft -= 2; + return ABIArgInfo::getDirect(); + } + } + + if (IsFixed && FRLen && Ty->isStructureOrClassType()) { + llvm::Type *Field1Ty = nullptr; + llvm::Type *Field2Ty = nullptr; + CharUnits Field1Off = CharUnits::Zero(); + CharUnits Field2Off = CharUnits::Zero(); + int NeededGARs = 0; + int NeededFARs = 0; + bool IsCandidate = detectFARsEligibleStruct( + Ty, Field1Ty, Field1Off, Field2Ty, Field2Off, NeededGARs, NeededFARs); + if (IsCandidate && NeededGARs <= GARsLeft && NeededFARs <= FARsLeft) { + GARsLeft -= NeededGARs; + FARsLeft -= NeededFARs; + return coerceAndExpandFARsEligibleStruct(Field1Ty, Field1Off, Field2Ty, + Field2Off); + } + } + + uint64_t NeededAlign = getContext().getTypeAlign(Ty); + // Determine the number of GARs needed to pass the current argument + // according to the ABI. 2*GRLen-aligned varargs are passed in "aligned" + // register pairs, so may consume 3 registers. + int NeededGARs = 1; + if (!IsFixed && NeededAlign == 2 * GRLen) + NeededGARs = 2 + (GARsLeft % 2); + else if (Size > GRLen && Size <= 2 * GRLen) + NeededGARs = 2; + + if (NeededGARs > GARsLeft) + NeededGARs = GARsLeft; + + GARsLeft -= NeededGARs; + + if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // All integral types are promoted to GRLen width. + if (Size < GRLen && Ty->isIntegralOrEnumerationType()) + return extendType(Ty); + + if (const auto *EIT = Ty->getAs()) { + if (EIT->getNumBits() < GRLen) + return extendType(Ty); + if (EIT->getNumBits() > 128 || + (!getContext().getTargetInfo().hasInt128Type() && + EIT->getNumBits() > 64)) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + } + + return ABIArgInfo::getDirect(); + } + + // Aggregates which are <= 2*GRLen will be passed in registers if possible, + // so coerce to integers. + if (Size <= 2 * GRLen) { + // Use a single GRLen int if possible, 2*GRLen if 2*GRLen alignment is + // required, and a 2-element GRLen array if only GRLen alignment is + // required. + if (Size <= GRLen) { + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), GRLen)); + } + if (getContext().getTypeAlign(Ty) == 2 * GRLen) { + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), 2 * GRLen)); + } + return ABIArgInfo::getDirect( + llvm::ArrayType::get(llvm::IntegerType::get(getVMContext(), GRLen), 2)); + } + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); +} + +ABIArgInfo LoongArchABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + // The rules for return and argument types are the same, so defer to + // classifyArgumentType. + int GARsLeft = 2; + int FARsLeft = FRLen ? 2 : 0; + return classifyArgumentType(RetTy, /*IsFixed=*/true, GARsLeft, FARsLeft); +} + +Address LoongArchABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + CharUnits SlotSize = CharUnits::fromQuantity(GRLen / 8); + + // Empty records are ignored for parameter passing purposes. + if (isEmptyRecord(getContext(), Ty, true)) { + Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr), + getVAListElementType(CGF), SlotSize); + Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); + return Addr; + } + + auto TInfo = getContext().getTypeInfoInChars(Ty); + + // Arguments bigger than 2*GRLen bytes are passed indirectly. + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, + /*IsIndirect=*/TInfo.Width > 2 * SlotSize, TInfo, + SlotSize, + /*AllowHigherAlign=*/true); +} + +ABIArgInfo LoongArchABIInfo::extendType(QualType Ty) const { + int TySize = getContext().getTypeSize(Ty); + // LA64 ABI requires unsigned 32 bit integers to be sign extended. + if (GRLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32) + return ABIArgInfo::getSignExtend(Ty); + return ABIArgInfo::getExtend(Ty); +} + +namespace { +class LoongArchTargetCodeGenInfo : public TargetCodeGenInfo { +public: + LoongArchTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen, + unsigned FRLen) + : TargetCodeGenInfo( + std::make_unique(CGT, GRLen, FRLen)) {} +}; +} // namespace + +std::unique_ptr +CodeGen::createLoongArchTargetCodeGenInfo(CodeGenModule &CGM, unsigned GRLen, + unsigned FLen) { + return std::make_unique(CGM.getTypes(), GRLen, + FLen); +} diff --git a/clang/lib/CodeGen/Targets/M68k.cpp b/clang/lib/CodeGen/Targets/M68k.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/M68k.cpp @@ -0,0 +1,55 @@ +//===- M68k.cpp -----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// M68k ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class M68kTargetCodeGenInfo : public TargetCodeGenInfo { +public: + M68kTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &M) const override; +}; + +} // namespace + +void M68kTargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { + if (const auto *FD = dyn_cast_or_null(D)) { + if (const auto *attr = FD->getAttr()) { + // Handle 'interrupt' attribute: + llvm::Function *F = cast(GV); + + // Step 1: Set ISR calling convention. + F->setCallingConv(llvm::CallingConv::M68k_INTR); + + // Step 2: Add attributes goodness. + F->addFnAttr(llvm::Attribute::NoInline); + + // Step 3: Emit ISR vector alias. + unsigned Num = attr->getNumber() / 2; + llvm::GlobalAlias::create(llvm::Function::ExternalLinkage, + "__isr_" + Twine(Num), F); + } + } +} + +std::unique_ptr +CodeGen::createM68kTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/MSP430.cpp b/clang/lib/CodeGen/Targets/MSP430.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/MSP430.cpp @@ -0,0 +1,94 @@ +//===- MSP430.cpp ---------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// MSP430 ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class MSP430ABIInfo : public DefaultABIInfo { + static ABIArgInfo complexArgInfo() { + ABIArgInfo Info = ABIArgInfo::getDirect(); + Info.setCanBeFlattened(false); + return Info; + } + +public: + MSP430ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + + ABIArgInfo classifyReturnType(QualType RetTy) const { + if (RetTy->isAnyComplexType()) + return complexArgInfo(); + + return DefaultABIInfo::classifyReturnType(RetTy); + } + + ABIArgInfo classifyArgumentType(QualType RetTy) const { + if (RetTy->isAnyComplexType()) + return complexArgInfo(); + + return DefaultABIInfo::classifyArgumentType(RetTy); + } + + // Just copy the original implementations because + // DefaultABIInfo::classify{Return,Argument}Type() are not virtual + void computeInfo(CGFunctionInfo &FI) const override { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); + } + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override { + return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty)); + } +}; + +class MSP430TargetCodeGenInfo : public TargetCodeGenInfo { +public: + MSP430TargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &M) const override; +}; + +} + +void MSP430TargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { + if (GV->isDeclaration()) + return; + if (const FunctionDecl *FD = dyn_cast_or_null(D)) { + const auto *InterruptAttr = FD->getAttr(); + if (!InterruptAttr) + return; + + // Handle 'interrupt' attribute: + llvm::Function *F = cast(GV); + + // Step 1: Set ISR calling convention. + F->setCallingConv(llvm::CallingConv::MSP430_INTR); + + // Step 2: Add attributes goodness. + F->addFnAttr(llvm::Attribute::NoInline); + F->addFnAttr("interrupt", llvm::utostr(InterruptAttr->getNumber())); + } +} + +std::unique_ptr +CodeGen::createMSP430TargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/Mips.cpp b/clang/lib/CodeGen/Targets/Mips.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/Mips.cpp @@ -0,0 +1,441 @@ +//===- Mips.cpp -----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// MIPS ABI Implementation. This works for both little-endian and +// big-endian variants. +//===----------------------------------------------------------------------===// + +namespace { +class MipsABIInfo : public ABIInfo { + bool IsO32; + const unsigned MinABIStackAlignInBytes, StackAlignInBytes; + void CoerceToIntArgs(uint64_t TySize, + SmallVectorImpl &ArgList) const; + llvm::Type* HandleAggregates(QualType Ty, uint64_t TySize) const; + llvm::Type* returnAggregateInRegs(QualType RetTy, uint64_t Size) const; + llvm::Type* getPaddingType(uint64_t Align, uint64_t Offset) const; +public: + MipsABIInfo(CodeGenTypes &CGT, bool _IsO32) : + ABIInfo(CGT), IsO32(_IsO32), MinABIStackAlignInBytes(IsO32 ? 4 : 8), + StackAlignInBytes(IsO32 ? 8 : 16) {} + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType RetTy, uint64_t &Offset) const; + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + ABIArgInfo extendType(QualType Ty) const; +}; + +class MIPSTargetCodeGenInfo : public TargetCodeGenInfo { + unsigned SizeOfUnwindException; +public: + MIPSTargetCodeGenInfo(CodeGenTypes &CGT, bool IsO32) + : TargetCodeGenInfo(std::make_unique(CGT, IsO32)), + SizeOfUnwindException(IsO32 ? 24 : 32) {} + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { + return 29; + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + const FunctionDecl *FD = dyn_cast_or_null(D); + if (!FD) return; + llvm::Function *Fn = cast(GV); + + if (FD->hasAttr()) + Fn->addFnAttr("long-call"); + else if (FD->hasAttr()) + Fn->addFnAttr("short-call"); + + // Other attributes do not have a meaning for declarations. + if (GV->isDeclaration()) + return; + + if (FD->hasAttr()) { + Fn->addFnAttr("mips16"); + } + else if (FD->hasAttr()) { + Fn->addFnAttr("nomips16"); + } + + if (FD->hasAttr()) + Fn->addFnAttr("micromips"); + else if (FD->hasAttr()) + Fn->addFnAttr("nomicromips"); + + const MipsInterruptAttr *Attr = FD->getAttr(); + if (!Attr) + return; + + const char *Kind; + switch (Attr->getInterrupt()) { + case MipsInterruptAttr::eic: Kind = "eic"; break; + case MipsInterruptAttr::sw0: Kind = "sw0"; break; + case MipsInterruptAttr::sw1: Kind = "sw1"; break; + case MipsInterruptAttr::hw0: Kind = "hw0"; break; + case MipsInterruptAttr::hw1: Kind = "hw1"; break; + case MipsInterruptAttr::hw2: Kind = "hw2"; break; + case MipsInterruptAttr::hw3: Kind = "hw3"; break; + case MipsInterruptAttr::hw4: Kind = "hw4"; break; + case MipsInterruptAttr::hw5: Kind = "hw5"; break; + } + + Fn->addFnAttr("interrupt", Kind); + + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; + + unsigned getSizeOfUnwindException() const override { + return SizeOfUnwindException; + } +}; +} + +void MipsABIInfo::CoerceToIntArgs( + uint64_t TySize, SmallVectorImpl &ArgList) const { + llvm::IntegerType *IntTy = + llvm::IntegerType::get(getVMContext(), MinABIStackAlignInBytes * 8); + + // Add (TySize / MinABIStackAlignInBytes) args of IntTy. + for (unsigned N = TySize / (MinABIStackAlignInBytes * 8); N; --N) + ArgList.push_back(IntTy); + + // If necessary, add one more integer type to ArgList. + unsigned R = TySize % (MinABIStackAlignInBytes * 8); + + if (R) + ArgList.push_back(llvm::IntegerType::get(getVMContext(), R)); +} + +// In N32/64, an aligned double precision floating point field is passed in +// a register. +llvm::Type* MipsABIInfo::HandleAggregates(QualType Ty, uint64_t TySize) const { + SmallVector ArgList, IntArgList; + + if (IsO32) { + CoerceToIntArgs(TySize, ArgList); + return llvm::StructType::get(getVMContext(), ArgList); + } + + if (Ty->isComplexType()) + return CGT.ConvertType(Ty); + + const RecordType *RT = Ty->getAs(); + + // Unions/vectors are passed in integer registers. + if (!RT || !RT->isStructureOrClassType()) { + CoerceToIntArgs(TySize, ArgList); + return llvm::StructType::get(getVMContext(), ArgList); + } + + const RecordDecl *RD = RT->getDecl(); + const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); + assert(!(TySize % 8) && "Size of structure must be multiple of 8."); + + uint64_t LastOffset = 0; + unsigned idx = 0; + llvm::IntegerType *I64 = llvm::IntegerType::get(getVMContext(), 64); + + // Iterate over fields in the struct/class and check if there are any aligned + // double fields. + for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); + i != e; ++i, ++idx) { + const QualType Ty = i->getType(); + const BuiltinType *BT = Ty->getAs(); + + if (!BT || BT->getKind() != BuiltinType::Double) + continue; + + uint64_t Offset = Layout.getFieldOffset(idx); + if (Offset % 64) // Ignore doubles that are not aligned. + continue; + + // Add ((Offset - LastOffset) / 64) args of type i64. + for (unsigned j = (Offset - LastOffset) / 64; j > 0; --j) + ArgList.push_back(I64); + + // Add double type. + ArgList.push_back(llvm::Type::getDoubleTy(getVMContext())); + LastOffset = Offset + 64; + } + + CoerceToIntArgs(TySize - LastOffset, IntArgList); + ArgList.append(IntArgList.begin(), IntArgList.end()); + + return llvm::StructType::get(getVMContext(), ArgList); +} + +llvm::Type *MipsABIInfo::getPaddingType(uint64_t OrigOffset, + uint64_t Offset) const { + if (OrigOffset + MinABIStackAlignInBytes > Offset) + return nullptr; + + return llvm::IntegerType::get(getVMContext(), (Offset - OrigOffset) * 8); +} + +ABIArgInfo +MipsABIInfo::classifyArgumentType(QualType Ty, uint64_t &Offset) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + uint64_t OrigOffset = Offset; + uint64_t TySize = getContext().getTypeSize(Ty); + uint64_t Align = getContext().getTypeAlign(Ty) / 8; + + Align = std::clamp(Align, (uint64_t)MinABIStackAlignInBytes, + (uint64_t)StackAlignInBytes); + unsigned CurrOffset = llvm::alignTo(Offset, Align); + Offset = CurrOffset + llvm::alignTo(TySize, Align * 8) / 8; + + if (isAggregateTypeForABI(Ty) || Ty->isVectorType()) { + // Ignore empty aggregates. + if (TySize == 0) + return ABIArgInfo::getIgnore(); + + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { + Offset = OrigOffset + MinABIStackAlignInBytes; + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + } + + // If we have reached here, aggregates are passed directly by coercing to + // another structure type. Padding is inserted if the offset of the + // aggregate is unaligned. + ABIArgInfo ArgInfo = + ABIArgInfo::getDirect(HandleAggregates(Ty, TySize), 0, + getPaddingType(OrigOffset, CurrOffset)); + ArgInfo.setInReg(true); + return ArgInfo; + } + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // Make sure we pass indirectly things that are too large. + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > 128 || + (EIT->getNumBits() > 64 && + !getContext().getTargetInfo().hasInt128Type())) + return getNaturalAlignIndirect(Ty); + + // All integral types are promoted to the GPR width. + if (Ty->isIntegralOrEnumerationType()) + return extendType(Ty); + + return ABIArgInfo::getDirect( + nullptr, 0, IsO32 ? nullptr : getPaddingType(OrigOffset, CurrOffset)); +} + +llvm::Type* +MipsABIInfo::returnAggregateInRegs(QualType RetTy, uint64_t Size) const { + const RecordType *RT = RetTy->getAs(); + SmallVector RTList; + + if (RT && RT->isStructureOrClassType()) { + const RecordDecl *RD = RT->getDecl(); + const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); + unsigned FieldCnt = Layout.getFieldCount(); + + // N32/64 returns struct/classes in floating point registers if the + // following conditions are met: + // 1. The size of the struct/class is no larger than 128-bit. + // 2. The struct/class has one or two fields all of which are floating + // point types. + // 3. The offset of the first field is zero (this follows what gcc does). + // + // Any other composite results are returned in integer registers. + // + if (FieldCnt && (FieldCnt <= 2) && !Layout.getFieldOffset(0)) { + RecordDecl::field_iterator b = RD->field_begin(), e = RD->field_end(); + for (; b != e; ++b) { + const BuiltinType *BT = b->getType()->getAs(); + + if (!BT || !BT->isFloatingPoint()) + break; + + RTList.push_back(CGT.ConvertType(b->getType())); + } + + if (b == e) + return llvm::StructType::get(getVMContext(), RTList, + RD->hasAttr()); + + RTList.clear(); + } + } + + CoerceToIntArgs(Size, RTList); + return llvm::StructType::get(getVMContext(), RTList); +} + +ABIArgInfo MipsABIInfo::classifyReturnType(QualType RetTy) const { + uint64_t Size = getContext().getTypeSize(RetTy); + + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + // O32 doesn't treat zero-sized structs differently from other structs. + // However, N32/N64 ignores zero sized return values. + if (!IsO32 && Size == 0) + return ABIArgInfo::getIgnore(); + + if (isAggregateTypeForABI(RetTy) || RetTy->isVectorType()) { + if (Size <= 128) { + if (RetTy->isAnyComplexType()) + return ABIArgInfo::getDirect(); + + // O32 returns integer vectors in registers and N32/N64 returns all small + // aggregates in registers. + if (!IsO32 || + (RetTy->isVectorType() && !RetTy->hasFloatingRepresentation())) { + ABIArgInfo ArgInfo = + ABIArgInfo::getDirect(returnAggregateInRegs(RetTy, Size)); + ArgInfo.setInReg(true); + return ArgInfo; + } + } + + return getNaturalAlignIndirect(RetTy); + } + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + // Make sure we pass indirectly things that are too large. + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > 128 || + (EIT->getNumBits() > 64 && + !getContext().getTargetInfo().hasInt128Type())) + return getNaturalAlignIndirect(RetTy); + + if (isPromotableIntegerTypeForABI(RetTy)) + return ABIArgInfo::getExtend(RetTy); + + if ((RetTy->isUnsignedIntegerOrEnumerationType() || + RetTy->isSignedIntegerOrEnumerationType()) && Size == 32 && !IsO32) + return ABIArgInfo::getSignExtend(RetTy); + + return ABIArgInfo::getDirect(); +} + +void MipsABIInfo::computeInfo(CGFunctionInfo &FI) const { + ABIArgInfo &RetInfo = FI.getReturnInfo(); + if (!getCXXABI().classifyReturnType(FI)) + RetInfo = classifyReturnType(FI.getReturnType()); + + // Check if a pointer to an aggregate is passed as a hidden argument. + uint64_t Offset = RetInfo.isIndirect() ? MinABIStackAlignInBytes : 0; + + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type, Offset); +} + +Address MipsABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType OrigTy) const { + QualType Ty = OrigTy; + + // Integer arguments are promoted to 32-bit on O32 and 64-bit on N32/N64. + // Pointers are also promoted in the same way but this only matters for N32. + unsigned SlotSizeInBits = IsO32 ? 32 : 64; + unsigned PtrWidth = getTarget().getPointerWidth(LangAS::Default); + bool DidPromote = false; + if ((Ty->isIntegerType() && + getContext().getIntWidth(Ty) < SlotSizeInBits) || + (Ty->isPointerType() && PtrWidth < SlotSizeInBits)) { + DidPromote = true; + Ty = getContext().getIntTypeForBitwidth(SlotSizeInBits, + Ty->isSignedIntegerType()); + } + + auto TyInfo = getContext().getTypeInfoInChars(Ty); + + // The alignment of things in the argument area is never larger than + // StackAlignInBytes. + TyInfo.Align = + std::min(TyInfo.Align, CharUnits::fromQuantity(StackAlignInBytes)); + + // MinABIStackAlignInBytes is the size of argument slots on the stack. + CharUnits ArgSlotSize = CharUnits::fromQuantity(MinABIStackAlignInBytes); + + Address Addr = emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false, + TyInfo, ArgSlotSize, /*AllowHigherAlign*/ true); + + + // If there was a promotion, "unpromote" into a temporary. + // TODO: can we just use a pointer into a subset of the original slot? + if (DidPromote) { + Address Temp = CGF.CreateMemTemp(OrigTy, "vaarg.promotion-temp"); + llvm::Value *Promoted = CGF.Builder.CreateLoad(Addr); + + // Truncate down to the right width. + llvm::Type *IntTy = (OrigTy->isIntegerType() ? Temp.getElementType() + : CGF.IntPtrTy); + llvm::Value *V = CGF.Builder.CreateTrunc(Promoted, IntTy); + if (OrigTy->isPointerType()) + V = CGF.Builder.CreateIntToPtr(V, Temp.getElementType()); + + CGF.Builder.CreateStore(V, Temp); + Addr = Temp; + } + + return Addr; +} + +ABIArgInfo MipsABIInfo::extendType(QualType Ty) const { + int TySize = getContext().getTypeSize(Ty); + + // MIPS64 ABI requires unsigned 32 bit integers to be sign extended. + if (Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32) + return ABIArgInfo::getSignExtend(Ty); + + return ABIArgInfo::getExtend(Ty); +} + +bool +MIPSTargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const { + // This information comes from gcc's implementation, which seems to + // as canonical as it gets. + + // Everything on MIPS is 4 bytes. Double-precision FP registers + // are aliased to pairs of single-precision FP registers. + llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4); + + // 0-31 are the general purpose registers, $0 - $31. + // 32-63 are the floating-point registers, $f0 - $f31. + // 64 and 65 are the multiply/divide registers, $hi and $lo. + // 66 is the (notional, I think) register for signal-handler return. + AssignToArrayRange(CGF.Builder, Address, Four8, 0, 65); + + // 67-74 are the floating-point status registers, $fcc0 - $fcc7. + // They are one bit wide and ignored here. + + // 80-111 are the coprocessor 0 registers, $c0r0 - $c0r31. + // (coprocessor 1 is the FP unit) + // 112-143 are the coprocessor 2 registers, $c2r0 - $c2r31. + // 144-175 are the coprocessor 3 registers, $c3r0 - $c3r31. + // 176-181 are the DSP accumulator registers. + AssignToArrayRange(CGF.Builder, Address, Four8, 80, 181); + return false; +} + +std::unique_ptr +CodeGen::createMIPSTargetCodeGenInfo(CodeGenModule &CGM, bool IsOS32) { + return std::make_unique(CGM.getTypes(), IsOS32); +} diff --git a/clang/lib/CodeGen/Targets/NVPTX.cpp b/clang/lib/CodeGen/Targets/NVPTX.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/NVPTX.cpp @@ -0,0 +1,308 @@ +//===- NVPTX.cpp ----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" +#include "llvm/IR/IntrinsicsNVPTX.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// NVPTX ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class NVPTXTargetCodeGenInfo; + +class NVPTXABIInfo : public ABIInfo { + NVPTXTargetCodeGenInfo &CGInfo; + +public: + NVPTXABIInfo(CodeGenTypes &CGT, NVPTXTargetCodeGenInfo &Info) + : ABIInfo(CGT), CGInfo(Info) {} + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType Ty) const; + + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + bool isUnsupportedType(QualType T) const; + ABIArgInfo coerceToIntArrayWithLimit(QualType Ty, unsigned MaxSize) const; +}; + +class NVPTXTargetCodeGenInfo : public TargetCodeGenInfo { +public: + NVPTXTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT, *this)) {} + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &M) const override; + bool shouldEmitStaticExternCAliases() const override; + + llvm::Type *getCUDADeviceBuiltinSurfaceDeviceType() const override { + // On the device side, surface reference is represented as an object handle + // in 64-bit integer. + return llvm::Type::getInt64Ty(getABIInfo().getVMContext()); + } + + llvm::Type *getCUDADeviceBuiltinTextureDeviceType() const override { + // On the device side, texture reference is represented as an object handle + // in 64-bit integer. + return llvm::Type::getInt64Ty(getABIInfo().getVMContext()); + } + + bool emitCUDADeviceBuiltinSurfaceDeviceCopy(CodeGenFunction &CGF, LValue Dst, + LValue Src) const override { + emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src); + return true; + } + + bool emitCUDADeviceBuiltinTextureDeviceCopy(CodeGenFunction &CGF, LValue Dst, + LValue Src) const override { + emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src); + return true; + } + +private: + // Adds a NamedMDNode with GV, Name, and Operand as operands, and adds the + // resulting MDNode to the nvvm.annotations MDNode. + static void addNVVMMetadata(llvm::GlobalValue *GV, StringRef Name, + int Operand); + + static void emitBuiltinSurfTexDeviceCopy(CodeGenFunction &CGF, LValue Dst, + LValue Src) { + llvm::Value *Handle = nullptr; + llvm::Constant *C = + llvm::dyn_cast(Src.getAddress(CGF).getPointer()); + // Lookup `addrspacecast` through the constant pointer if any. + if (auto *ASC = llvm::dyn_cast_or_null(C)) + C = llvm::cast(ASC->getPointerOperand()); + if (auto *GV = llvm::dyn_cast_or_null(C)) { + // Load the handle from the specific global variable using + // `nvvm.texsurf.handle.internal` intrinsic. + Handle = CGF.EmitRuntimeCall( + CGF.CGM.getIntrinsic(llvm::Intrinsic::nvvm_texsurf_handle_internal, + {GV->getType()}), + {GV}, "texsurf_handle"); + } else + Handle = CGF.EmitLoadOfScalar(Src, SourceLocation()); + CGF.EmitStoreOfScalar(Handle, Dst); + } +}; + +/// Checks if the type is unsupported directly by the current target. +bool NVPTXABIInfo::isUnsupportedType(QualType T) const { + ASTContext &Context = getContext(); + if (!Context.getTargetInfo().hasFloat16Type() && T->isFloat16Type()) + return true; + if (!Context.getTargetInfo().hasFloat128Type() && + (T->isFloat128Type() || + (T->isRealFloatingType() && Context.getTypeSize(T) == 128))) + return true; + if (const auto *EIT = T->getAs()) + return EIT->getNumBits() > + (Context.getTargetInfo().hasInt128Type() ? 128U : 64U); + if (!Context.getTargetInfo().hasInt128Type() && T->isIntegerType() && + Context.getTypeSize(T) > 64U) + return true; + if (const auto *AT = T->getAsArrayTypeUnsafe()) + return isUnsupportedType(AT->getElementType()); + const auto *RT = T->getAs(); + if (!RT) + return false; + const RecordDecl *RD = RT->getDecl(); + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) + for (const CXXBaseSpecifier &I : CXXRD->bases()) + if (isUnsupportedType(I.getType())) + return true; + + for (const FieldDecl *I : RD->fields()) + if (isUnsupportedType(I->getType())) + return true; + return false; +} + +/// Coerce the given type into an array with maximum allowed size of elements. +ABIArgInfo NVPTXABIInfo::coerceToIntArrayWithLimit(QualType Ty, + unsigned MaxSize) const { + // Alignment and Size are measured in bits. + const uint64_t Size = getContext().getTypeSize(Ty); + const uint64_t Alignment = getContext().getTypeAlign(Ty); + const unsigned Div = std::min(MaxSize, Alignment); + llvm::Type *IntType = llvm::Type::getIntNTy(getVMContext(), Div); + const uint64_t NumElements = (Size + Div - 1) / Div; + return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements)); +} + +ABIArgInfo NVPTXABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (getContext().getLangOpts().OpenMP && + getContext().getLangOpts().OpenMPIsDevice && isUnsupportedType(RetTy)) + return coerceToIntArrayWithLimit(RetTy, 64); + + // note: this is different from default ABI + if (!RetTy->isScalarType()) + return ABIArgInfo::getDirect(); + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +ABIArgInfo NVPTXABIInfo::classifyArgumentType(QualType Ty) const { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // Return aggregates type as indirect by value + if (isAggregateTypeForABI(Ty)) { + // Under CUDA device compilation, tex/surf builtin types are replaced with + // object types and passed directly. + if (getContext().getLangOpts().CUDAIsDevice) { + if (Ty->isCUDADeviceBuiltinSurfaceType()) + return ABIArgInfo::getDirect( + CGInfo.getCUDADeviceBuiltinSurfaceDeviceType()); + if (Ty->isCUDADeviceBuiltinTextureType()) + return ABIArgInfo::getDirect( + CGInfo.getCUDADeviceBuiltinTextureDeviceType()); + } + return getNaturalAlignIndirect(Ty, /* byval */ true); + } + + if (const auto *EIT = Ty->getAs()) { + if ((EIT->getNumBits() > 128) || + (!getContext().getTargetInfo().hasInt128Type() && + EIT->getNumBits() > 64)) + return getNaturalAlignIndirect(Ty, /* byval */ true); + } + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); +} + +void NVPTXABIInfo::computeInfo(CGFunctionInfo &FI) const { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); + + // Always honor user-specified calling convention. + if (FI.getCallingConvention() != llvm::CallingConv::C) + return; + + FI.setEffectiveCallingConvention(getRuntimeCC()); +} + +Address NVPTXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + llvm_unreachable("NVPTX does not support varargs"); +} + +void NVPTXTargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { + if (GV->isDeclaration()) + return; + const VarDecl *VD = dyn_cast_or_null(D); + if (VD) { + if (M.getLangOpts().CUDA) { + if (VD->getType()->isCUDADeviceBuiltinSurfaceType()) + addNVVMMetadata(GV, "surface", 1); + else if (VD->getType()->isCUDADeviceBuiltinTextureType()) + addNVVMMetadata(GV, "texture", 1); + return; + } + } + + const FunctionDecl *FD = dyn_cast_or_null(D); + if (!FD) return; + + llvm::Function *F = cast(GV); + + // Perform special handling in OpenCL mode + if (M.getLangOpts().OpenCL) { + // Use OpenCL function attributes to check for kernel functions + // By default, all functions are device functions + if (FD->hasAttr()) { + // OpenCL __kernel functions get kernel metadata + // Create !{, metadata !"kernel", i32 1} node + addNVVMMetadata(F, "kernel", 1); + // And kernel functions are not subject to inlining + F->addFnAttr(llvm::Attribute::NoInline); + } + } + + // Perform special handling in CUDA mode. + if (M.getLangOpts().CUDA) { + // CUDA __global__ functions get a kernel metadata entry. Since + // __global__ functions cannot be called from the device, we do not + // need to set the noinline attribute. + if (FD->hasAttr()) { + // Create !{, metadata !"kernel", i32 1} node + addNVVMMetadata(F, "kernel", 1); + } + if (CUDALaunchBoundsAttr *Attr = FD->getAttr()) { + // Create !{, metadata !"maxntidx", i32 } node + llvm::APSInt MaxThreads(32); + MaxThreads = Attr->getMaxThreads()->EvaluateKnownConstInt(M.getContext()); + if (MaxThreads > 0) + addNVVMMetadata(F, "maxntidx", MaxThreads.getExtValue()); + + // min blocks is an optional argument for CUDALaunchBoundsAttr. If it was + // not specified in __launch_bounds__ or if the user specified a 0 value, + // we don't have to add a PTX directive. + if (Attr->getMinBlocks()) { + llvm::APSInt MinBlocks(32); + MinBlocks = Attr->getMinBlocks()->EvaluateKnownConstInt(M.getContext()); + if (MinBlocks > 0) + // Create !{, metadata !"minctasm", i32 } node + addNVVMMetadata(F, "minctasm", MinBlocks.getExtValue()); + } + } + } + + // Attach kernel metadata directly if compiling for NVPTX. + if (FD->hasAttr()) { + addNVVMMetadata(F, "kernel", 1); + } +} + +void NVPTXTargetCodeGenInfo::addNVVMMetadata(llvm::GlobalValue *GV, + StringRef Name, int Operand) { + llvm::Module *M = GV->getParent(); + llvm::LLVMContext &Ctx = M->getContext(); + + // Get "nvvm.annotations" metadata node + llvm::NamedMDNode *MD = M->getOrInsertNamedMetadata("nvvm.annotations"); + + llvm::Metadata *MDVals[] = { + llvm::ConstantAsMetadata::get(GV), llvm::MDString::get(Ctx, Name), + llvm::ConstantAsMetadata::get( + llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), Operand))}; + // Append metadata to nvvm.annotations + MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); +} + +bool NVPTXTargetCodeGenInfo::shouldEmitStaticExternCAliases() const { + return false; +} +} + +std::unique_ptr +CodeGen::createNVPTXTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/PNaCl.cpp b/clang/lib/CodeGen/Targets/PNaCl.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/PNaCl.cpp @@ -0,0 +1,109 @@ +//===- PNaCl.cpp ----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// le32/PNaCl bitcode ABI Implementation +// +// This is a simplified version of the x86_32 ABI. Arguments and return values +// are always passed on the stack. +//===----------------------------------------------------------------------===// + +class PNaClABIInfo : public ABIInfo { + public: + PNaClABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {} + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType RetTy) const; + + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, + Address VAListAddr, QualType Ty) const override; +}; + +class PNaClTargetCodeGenInfo : public TargetCodeGenInfo { + public: + PNaClTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} +}; + +void PNaClABIInfo::computeInfo(CGFunctionInfo &FI) const { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); +} + +Address PNaClABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + // The PNaCL ABI is a bit odd, in that varargs don't use normal + // function classification. Structs get passed directly for varargs + // functions, through a rewriting transform in + // pnacl-llvm/lib/Transforms/NaCl/ExpandVarArgs.cpp, which allows + // this target to actually support a va_arg instructions with an + // aggregate type, unlike other targets. + return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect()); +} + +/// Classify argument of given type \p Ty. +ABIArgInfo PNaClABIInfo::classifyArgumentType(QualType Ty) const { + if (isAggregateTypeForABI(Ty)) { + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + return getNaturalAlignIndirect(Ty); + } else if (const EnumType *EnumTy = Ty->getAs()) { + // Treat an enum type as its underlying type. + Ty = EnumTy->getDecl()->getIntegerType(); + } else if (Ty->isFloatingType()) { + // Floating-point types don't go inreg. + return ABIArgInfo::getDirect(); + } else if (const auto *EIT = Ty->getAs()) { + // Treat bit-precise integers as integers if <= 64, otherwise pass + // indirectly. + if (EIT->getNumBits() > 64) + return getNaturalAlignIndirect(Ty); + return ABIArgInfo::getDirect(); + } + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); +} + +ABIArgInfo PNaClABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + // In the PNaCl ABI we always return records/structures on the stack. + if (isAggregateTypeForABI(RetTy)) + return getNaturalAlignIndirect(RetTy); + + // Treat bit-precise integers as integers if <= 64, otherwise pass indirectly. + if (const auto *EIT = RetTy->getAs()) { + if (EIT->getNumBits() > 64) + return getNaturalAlignIndirect(RetTy); + return ABIArgInfo::getDirect(); + } + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +std::unique_ptr +CodeGen::createPNaClTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/PPC.cpp b/clang/lib/CodeGen/Targets/PPC.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/PPC.cpp @@ -0,0 +1,973 @@ +//===- PPC.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +static Address complexTempStructure(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty, CharUnits SlotSize, + CharUnits EltSize, const ComplexType *CTy) { + Address Addr = + emitVoidPtrDirectVAArg(CGF, VAListAddr, CGF.Int8Ty, SlotSize * 2, + SlotSize, SlotSize, /*AllowHigher*/ true); + + Address RealAddr = Addr; + Address ImagAddr = RealAddr; + if (CGF.CGM.getDataLayout().isBigEndian()) { + RealAddr = + CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize - EltSize); + ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(ImagAddr, + 2 * SlotSize - EltSize); + } else { + ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize); + } + + llvm::Type *EltTy = CGF.ConvertTypeForMem(CTy->getElementType()); + RealAddr = CGF.Builder.CreateElementBitCast(RealAddr, EltTy); + ImagAddr = CGF.Builder.CreateElementBitCast(ImagAddr, EltTy); + llvm::Value *Real = CGF.Builder.CreateLoad(RealAddr, ".vareal"); + llvm::Value *Imag = CGF.Builder.CreateLoad(ImagAddr, ".vaimag"); + + Address Temp = CGF.CreateMemTemp(Ty, "vacplx"); + CGF.EmitStoreOfComplex({Real, Imag}, CGF.MakeAddrLValue(Temp, Ty), + /*init*/ true); + return Temp; +} + +static bool PPC_initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address, bool Is64Bit, + bool IsAIX) { + // This is calculated from the LLVM and GCC tables and verified + // against gcc output. AFAIK all PPC ABIs use the same encoding. + + CodeGen::CGBuilderTy &Builder = CGF.Builder; + + llvm::IntegerType *i8 = CGF.Int8Ty; + llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4); + llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8); + llvm::Value *Sixteen8 = llvm::ConstantInt::get(i8, 16); + + // 0-31: r0-31, the 4-byte or 8-byte general-purpose registers + AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 0, 31); + + // 32-63: fp0-31, the 8-byte floating-point registers + AssignToArrayRange(Builder, Address, Eight8, 32, 63); + + // 64-67 are various 4-byte or 8-byte special-purpose registers: + // 64: mq + // 65: lr + // 66: ctr + // 67: ap + AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 64, 67); + + // 68-76 are various 4-byte special-purpose registers: + // 68-75 cr0-7 + // 76: xer + AssignToArrayRange(Builder, Address, Four8, 68, 76); + + // 77-108: v0-31, the 16-byte vector registers + AssignToArrayRange(Builder, Address, Sixteen8, 77, 108); + + // 109: vrsave + // 110: vscr + AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 109, 110); + + // AIX does not utilize the rest of the registers. + if (IsAIX) + return false; + + // 111: spe_acc + // 112: spefscr + // 113: sfp + AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 111, 113); + + if (!Is64Bit) + return false; + + // TODO: Need to verify if these registers are used on 64 bit AIX with Power8 + // or above CPU. + // 64-bit only registers: + // 114: tfhar + // 115: tfiar + // 116: texasr + AssignToArrayRange(Builder, Address, Eight8, 114, 116); + + return false; +} + +// AIX +namespace { +/// AIXABIInfo - The AIX XCOFF ABI information. +class AIXABIInfo : public ABIInfo { + const bool Is64Bit; + const unsigned PtrByteSize; + CharUnits getParamTypeAlignment(QualType Ty) const; + +public: + AIXABIInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit) + : ABIInfo(CGT), Is64Bit(Is64Bit), PtrByteSize(Is64Bit ? 8 : 4) {} + + bool isPromotableTypeForABI(QualType Ty) const; + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType Ty) const; + + void computeInfo(CGFunctionInfo &FI) const override { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); + } + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +class AIXTargetCodeGenInfo : public TargetCodeGenInfo { + const bool Is64Bit; + +public: + AIXTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit) + : TargetCodeGenInfo(std::make_unique(CGT, Is64Bit)), + Is64Bit(Is64Bit) {} + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + return 1; // r1 is the dedicated stack pointer + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; +}; +} // namespace + +// Return true if the ABI requires Ty to be passed sign- or zero- +// extended to 32/64 bits. +bool AIXABIInfo::isPromotableTypeForABI(QualType Ty) const { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // Promotable integer types are required to be promoted by the ABI. + if (getContext().isPromotableIntegerType(Ty)) + return true; + + if (!Is64Bit) + return false; + + // For 64 bit mode, in addition to the usual promotable integer types, we also + // need to extend all 32-bit types, since the ABI requires promotion to 64 + // bits. + if (const BuiltinType *BT = Ty->getAs()) + switch (BT->getKind()) { + case BuiltinType::Int: + case BuiltinType::UInt: + return true; + default: + break; + } + + return false; +} + +ABIArgInfo AIXABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isAnyComplexType()) + return ABIArgInfo::getDirect(); + + if (RetTy->isVectorType()) + return ABIArgInfo::getDirect(); + + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (isAggregateTypeForABI(RetTy)) + return getNaturalAlignIndirect(RetTy); + + return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +ABIArgInfo AIXABIInfo::classifyArgumentType(QualType Ty) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + if (Ty->isAnyComplexType()) + return ABIArgInfo::getDirect(); + + if (Ty->isVectorType()) + return ABIArgInfo::getDirect(); + + if (isAggregateTypeForABI(Ty)) { + // Records with non-trivial destructors/copy-constructors should not be + // passed by value. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + CharUnits CCAlign = getParamTypeAlignment(Ty); + CharUnits TyAlign = getContext().getTypeAlignInChars(Ty); + + return ABIArgInfo::getIndirect(CCAlign, /*ByVal*/ true, + /*Realign*/ TyAlign > CCAlign); + } + + return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); +} + +CharUnits AIXABIInfo::getParamTypeAlignment(QualType Ty) const { + // Complex types are passed just like their elements. + if (const ComplexType *CTy = Ty->getAs()) + Ty = CTy->getElementType(); + + if (Ty->isVectorType()) + return CharUnits::fromQuantity(16); + + // If the structure contains a vector type, the alignment is 16. + if (isRecordWithSIMDVectorType(getContext(), Ty)) + return CharUnits::fromQuantity(16); + + return CharUnits::fromQuantity(PtrByteSize); +} + +Address AIXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + + auto TypeInfo = getContext().getTypeInfoInChars(Ty); + TypeInfo.Align = getParamTypeAlignment(Ty); + + CharUnits SlotSize = CharUnits::fromQuantity(PtrByteSize); + + // If we have a complex type and the base type is smaller than the register + // size, the ABI calls for the real and imaginary parts to be right-adjusted + // in separate words in 32bit mode or doublewords in 64bit mode. However, + // Clang expects us to produce a pointer to a structure with the two parts + // packed tightly. So generate loads of the real and imaginary parts relative + // to the va_list pointer, and store them to a temporary structure. We do the + // same as the PPC64ABI here. + if (const ComplexType *CTy = Ty->getAs()) { + CharUnits EltSize = TypeInfo.Width / 2; + if (EltSize < SlotSize) + return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy); + } + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo, + SlotSize, /*AllowHigher*/ true); +} + +bool AIXTargetCodeGenInfo::initDwarfEHRegSizeTable( + CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const { + return PPC_initDwarfEHRegSizeTable(CGF, Address, Is64Bit, /*IsAIX*/ true); +} + +// PowerPC-32 +namespace { +/// PPC32_SVR4_ABIInfo - The 32-bit PowerPC ELF (SVR4) ABI information. +class PPC32_SVR4_ABIInfo : public DefaultABIInfo { + bool IsSoftFloatABI; + bool IsRetSmallStructInRegABI; + + CharUnits getParamTypeAlignment(QualType Ty) const; + +public: + PPC32_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, bool SoftFloatABI, + bool RetSmallStructInRegABI) + : DefaultABIInfo(CGT), IsSoftFloatABI(SoftFloatABI), + IsRetSmallStructInRegABI(RetSmallStructInRegABI) {} + + ABIArgInfo classifyReturnType(QualType RetTy) const; + + void computeInfo(CGFunctionInfo &FI) const override { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) + I.info = classifyArgumentType(I.type); + } + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +class PPC32TargetCodeGenInfo : public TargetCodeGenInfo { +public: + PPC32TargetCodeGenInfo(CodeGenTypes &CGT, bool SoftFloatABI, + bool RetSmallStructInRegABI) + : TargetCodeGenInfo(std::make_unique( + CGT, SoftFloatABI, RetSmallStructInRegABI)) {} + + static bool isStructReturnInRegABI(const llvm::Triple &Triple, + const CodeGenOptions &Opts); + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + // This is recovered from gcc output. + return 1; // r1 is the dedicated stack pointer + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; +}; +} + +CharUnits PPC32_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const { + // Complex types are passed just like their elements. + if (const ComplexType *CTy = Ty->getAs()) + Ty = CTy->getElementType(); + + if (Ty->isVectorType()) + return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16 + : 4); + + // For single-element float/vector structs, we consider the whole type + // to have the same alignment requirements as its single element. + const Type *AlignTy = nullptr; + if (const Type *EltType = isSingleElementStruct(Ty, getContext())) { + const BuiltinType *BT = EltType->getAs(); + if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) || + (BT && BT->isFloatingPoint())) + AlignTy = EltType; + } + + if (AlignTy) + return CharUnits::fromQuantity(AlignTy->isVectorType() ? 16 : 4); + return CharUnits::fromQuantity(4); +} + +ABIArgInfo PPC32_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const { + uint64_t Size; + + // -msvr4-struct-return puts small aggregates in GPR3 and GPR4. + if (isAggregateTypeForABI(RetTy) && IsRetSmallStructInRegABI && + (Size = getContext().getTypeSize(RetTy)) <= 64) { + // System V ABI (1995), page 3-22, specified: + // > A structure or union whose size is less than or equal to 8 bytes + // > shall be returned in r3 and r4, as if it were first stored in the + // > 8-byte aligned memory area and then the low addressed word were + // > loaded into r3 and the high-addressed word into r4. Bits beyond + // > the last member of the structure or union are not defined. + // + // GCC for big-endian PPC32 inserts the pad before the first member, + // not "beyond the last member" of the struct. To stay compatible + // with GCC, we coerce the struct to an integer of the same size. + // LLVM will extend it and return i32 in r3, or i64 in r3:r4. + if (Size == 0) + return ABIArgInfo::getIgnore(); + else { + llvm::Type *CoerceTy = llvm::Type::getIntNTy(getVMContext(), Size); + return ABIArgInfo::getDirect(CoerceTy); + } + } + + return DefaultABIInfo::classifyReturnType(RetTy); +} + +// TODO: this implementation is now likely redundant with +// DefaultABIInfo::EmitVAArg. +Address PPC32_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAList, + QualType Ty) const { + if (getTarget().getTriple().isOSDarwin()) { + auto TI = getContext().getTypeInfoInChars(Ty); + TI.Align = getParamTypeAlignment(Ty); + + CharUnits SlotSize = CharUnits::fromQuantity(4); + return emitVoidPtrVAArg(CGF, VAList, Ty, + classifyArgumentType(Ty).isIndirect(), TI, SlotSize, + /*AllowHigherAlign=*/true); + } + + const unsigned OverflowLimit = 8; + if (const ComplexType *CTy = Ty->getAs()) { + // TODO: Implement this. For now ignore. + (void)CTy; + return Address::invalid(); // FIXME? + } + + // struct __va_list_tag { + // unsigned char gpr; + // unsigned char fpr; + // unsigned short reserved; + // void *overflow_arg_area; + // void *reg_save_area; + // }; + + bool isI64 = Ty->isIntegerType() && getContext().getTypeSize(Ty) == 64; + bool isInt = !Ty->isFloatingType(); + bool isF64 = Ty->isFloatingType() && getContext().getTypeSize(Ty) == 64; + + // All aggregates are passed indirectly? That doesn't seem consistent + // with the argument-lowering code. + bool isIndirect = isAggregateTypeForABI(Ty); + + CGBuilderTy &Builder = CGF.Builder; + + // The calling convention either uses 1-2 GPRs or 1 FPR. + Address NumRegsAddr = Address::invalid(); + if (isInt || IsSoftFloatABI) { + NumRegsAddr = Builder.CreateStructGEP(VAList, 0, "gpr"); + } else { + NumRegsAddr = Builder.CreateStructGEP(VAList, 1, "fpr"); + } + + llvm::Value *NumRegs = Builder.CreateLoad(NumRegsAddr, "numUsedRegs"); + + // "Align" the register count when TY is i64. + if (isI64 || (isF64 && IsSoftFloatABI)) { + NumRegs = Builder.CreateAdd(NumRegs, Builder.getInt8(1)); + NumRegs = Builder.CreateAnd(NumRegs, Builder.getInt8((uint8_t) ~1U)); + } + + llvm::Value *CC = + Builder.CreateICmpULT(NumRegs, Builder.getInt8(OverflowLimit), "cond"); + + llvm::BasicBlock *UsingRegs = CGF.createBasicBlock("using_regs"); + llvm::BasicBlock *UsingOverflow = CGF.createBasicBlock("using_overflow"); + llvm::BasicBlock *Cont = CGF.createBasicBlock("cont"); + + Builder.CreateCondBr(CC, UsingRegs, UsingOverflow); + + llvm::Type *DirectTy = CGF.ConvertType(Ty), *ElementTy = DirectTy; + if (isIndirect) + DirectTy = llvm::PointerType::getUnqual(CGF.getLLVMContext()); + + // Case 1: consume registers. + Address RegAddr = Address::invalid(); + { + CGF.EmitBlock(UsingRegs); + + Address RegSaveAreaPtr = Builder.CreateStructGEP(VAList, 4); + RegAddr = Address(Builder.CreateLoad(RegSaveAreaPtr), CGF.Int8Ty, + CharUnits::fromQuantity(8)); + assert(RegAddr.getElementType() == CGF.Int8Ty); + + // Floating-point registers start after the general-purpose registers. + if (!(isInt || IsSoftFloatABI)) { + RegAddr = Builder.CreateConstInBoundsByteGEP(RegAddr, + CharUnits::fromQuantity(32)); + } + + // Get the address of the saved value by scaling the number of + // registers we've used by the number of + CharUnits RegSize = CharUnits::fromQuantity((isInt || IsSoftFloatABI) ? 4 : 8); + llvm::Value *RegOffset = + Builder.CreateMul(NumRegs, Builder.getInt8(RegSize.getQuantity())); + RegAddr = Address( + Builder.CreateInBoundsGEP(CGF.Int8Ty, RegAddr.getPointer(), RegOffset), + CGF.Int8Ty, RegAddr.getAlignment().alignmentOfArrayElement(RegSize)); + RegAddr = Builder.CreateElementBitCast(RegAddr, DirectTy); + + // Increase the used-register count. + NumRegs = + Builder.CreateAdd(NumRegs, + Builder.getInt8((isI64 || (isF64 && IsSoftFloatABI)) ? 2 : 1)); + Builder.CreateStore(NumRegs, NumRegsAddr); + + CGF.EmitBranch(Cont); + } + + // Case 2: consume space in the overflow area. + Address MemAddr = Address::invalid(); + { + CGF.EmitBlock(UsingOverflow); + + Builder.CreateStore(Builder.getInt8(OverflowLimit), NumRegsAddr); + + // Everything in the overflow area is rounded up to a size of at least 4. + CharUnits OverflowAreaAlign = CharUnits::fromQuantity(4); + + CharUnits Size; + if (!isIndirect) { + auto TypeInfo = CGF.getContext().getTypeInfoInChars(Ty); + Size = TypeInfo.Width.alignTo(OverflowAreaAlign); + } else { + Size = CGF.getPointerSize(); + } + + Address OverflowAreaAddr = Builder.CreateStructGEP(VAList, 3); + Address OverflowArea = + Address(Builder.CreateLoad(OverflowAreaAddr, "argp.cur"), CGF.Int8Ty, + OverflowAreaAlign); + // Round up address of argument to alignment + CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty); + if (Align > OverflowAreaAlign) { + llvm::Value *Ptr = OverflowArea.getPointer(); + OverflowArea = Address(emitRoundPointerUpToAlignment(CGF, Ptr, Align), + OverflowArea.getElementType(), Align); + } + + MemAddr = Builder.CreateElementBitCast(OverflowArea, DirectTy); + + // Increase the overflow area. + OverflowArea = Builder.CreateConstInBoundsByteGEP(OverflowArea, Size); + Builder.CreateStore(OverflowArea.getPointer(), OverflowAreaAddr); + CGF.EmitBranch(Cont); + } + + CGF.EmitBlock(Cont); + + // Merge the cases with a phi. + Address Result = emitMergePHI(CGF, RegAddr, UsingRegs, MemAddr, UsingOverflow, + "vaarg.addr"); + + // Load the pointer if the argument was passed indirectly. + if (isIndirect) { + Result = Address(Builder.CreateLoad(Result, "aggr"), ElementTy, + getContext().getTypeAlignInChars(Ty)); + } + + return Result; +} + +bool PPC32TargetCodeGenInfo::isStructReturnInRegABI( + const llvm::Triple &Triple, const CodeGenOptions &Opts) { + assert(Triple.isPPC32()); + + switch (Opts.getStructReturnConvention()) { + case CodeGenOptions::SRCK_Default: + break; + case CodeGenOptions::SRCK_OnStack: // -maix-struct-return + return false; + case CodeGenOptions::SRCK_InRegs: // -msvr4-struct-return + return true; + } + + if (Triple.isOSBinFormatELF() && !Triple.isOSLinux()) + return true; + + return false; +} + +bool +PPC32TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const { + return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ false, + /*IsAIX*/ false); +} + +// PowerPC-64 + +namespace { + +/// PPC64_SVR4_ABIInfo - The 64-bit PowerPC ELF (SVR4) ABI information. +class PPC64_SVR4_ABIInfo : public ABIInfo { + static const unsigned GPRBits = 64; + PPC64_SVR4_ABIKind Kind; + bool IsSoftFloatABI; + +public: + PPC64_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind, + bool SoftFloatABI) + : ABIInfo(CGT), Kind(Kind), IsSoftFloatABI(SoftFloatABI) {} + + bool isPromotableTypeForABI(QualType Ty) const; + CharUnits getParamTypeAlignment(QualType Ty) const; + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType Ty) const; + + bool isHomogeneousAggregateBaseType(QualType Ty) const override; + bool isHomogeneousAggregateSmallEnough(const Type *Ty, + uint64_t Members) const override; + + // TODO: We can add more logic to computeInfo to improve performance. + // Example: For aggregate arguments that fit in a register, we could + // use getDirectInReg (as is done below for structs containing a single + // floating-point value) to avoid pushing them to memory on function + // entry. This would require changing the logic in PPCISelLowering + // when lowering the parameters in the caller and args in the callee. + void computeInfo(CGFunctionInfo &FI) const override { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &I : FI.arguments()) { + // We rely on the default argument classification for the most part. + // One exception: An aggregate containing a single floating-point + // or vector item must be passed in a register if one is available. + const Type *T = isSingleElementStruct(I.type, getContext()); + if (T) { + const BuiltinType *BT = T->getAs(); + if ((T->isVectorType() && getContext().getTypeSize(T) == 128) || + (BT && BT->isFloatingPoint())) { + QualType QT(T, 0); + I.info = ABIArgInfo::getDirectInReg(CGT.ConvertType(QT)); + continue; + } + } + I.info = classifyArgumentType(I.type); + } + } + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +class PPC64_SVR4_TargetCodeGenInfo : public TargetCodeGenInfo { + +public: + PPC64_SVR4_TargetCodeGenInfo(CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind, + bool SoftFloatABI) + : TargetCodeGenInfo( + std::make_unique(CGT, Kind, SoftFloatABI)) { + SwiftInfo = + std::make_unique(CGT, /*SwiftErrorInRegister=*/false); + } + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + // This is recovered from gcc output. + return 1; // r1 is the dedicated stack pointer + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; +}; + +class PPC64TargetCodeGenInfo : public TargetCodeGenInfo { +public: + PPC64TargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + // This is recovered from gcc output. + return 1; // r1 is the dedicated stack pointer + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; +}; +} + +// Return true if the ABI requires Ty to be passed sign- or zero- +// extended to 64 bits. +bool +PPC64_SVR4_ABIInfo::isPromotableTypeForABI(QualType Ty) const { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // Promotable integer types are required to be promoted by the ABI. + if (isPromotableIntegerTypeForABI(Ty)) + return true; + + // In addition to the usual promotable integer types, we also need to + // extend all 32-bit types, since the ABI requires promotion to 64 bits. + if (const BuiltinType *BT = Ty->getAs()) + switch (BT->getKind()) { + case BuiltinType::Int: + case BuiltinType::UInt: + return true; + default: + break; + } + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() < 64) + return true; + + return false; +} + +/// isAlignedParamType - Determine whether a type requires 16-byte or +/// higher alignment in the parameter area. Always returns at least 8. +CharUnits PPC64_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const { + // Complex types are passed just like their elements. + if (const ComplexType *CTy = Ty->getAs()) + Ty = CTy->getElementType(); + + auto FloatUsesVector = [this](QualType Ty){ + return Ty->isRealFloatingType() && &getContext().getFloatTypeSemantics( + Ty) == &llvm::APFloat::IEEEquad(); + }; + + // Only vector types of size 16 bytes need alignment (larger types are + // passed via reference, smaller types are not aligned). + if (Ty->isVectorType()) { + return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16 : 8); + } else if (FloatUsesVector(Ty)) { + // According to ABI document section 'Optional Save Areas': If extended + // precision floating-point values in IEEE BINARY 128 QUADRUPLE PRECISION + // format are supported, map them to a single quadword, quadword aligned. + return CharUnits::fromQuantity(16); + } + + // For single-element float/vector structs, we consider the whole type + // to have the same alignment requirements as its single element. + const Type *AlignAsType = nullptr; + const Type *EltType = isSingleElementStruct(Ty, getContext()); + if (EltType) { + const BuiltinType *BT = EltType->getAs(); + if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) || + (BT && BT->isFloatingPoint())) + AlignAsType = EltType; + } + + // Likewise for ELFv2 homogeneous aggregates. + const Type *Base = nullptr; + uint64_t Members = 0; + if (!AlignAsType && Kind == PPC64_SVR4_ABIKind::ELFv2 && + isAggregateTypeForABI(Ty) && isHomogeneousAggregate(Ty, Base, Members)) + AlignAsType = Base; + + // With special case aggregates, only vector base types need alignment. + if (AlignAsType) { + bool UsesVector = AlignAsType->isVectorType() || + FloatUsesVector(QualType(AlignAsType, 0)); + return CharUnits::fromQuantity(UsesVector ? 16 : 8); + } + + // Otherwise, we only need alignment for any aggregate type that + // has an alignment requirement of >= 16 bytes. + if (isAggregateTypeForABI(Ty) && getContext().getTypeAlign(Ty) >= 128) { + return CharUnits::fromQuantity(16); + } + + return CharUnits::fromQuantity(8); +} + +bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const { + // Homogeneous aggregates for ELFv2 must have base types of float, + // double, long double, or 128-bit vectors. + if (const BuiltinType *BT = Ty->getAs()) { + if (BT->getKind() == BuiltinType::Float || + BT->getKind() == BuiltinType::Double || + BT->getKind() == BuiltinType::LongDouble || + BT->getKind() == BuiltinType::Ibm128 || + (getContext().getTargetInfo().hasFloat128Type() && + (BT->getKind() == BuiltinType::Float128))) { + if (IsSoftFloatABI) + return false; + return true; + } + } + if (const VectorType *VT = Ty->getAs()) { + if (getContext().getTypeSize(VT) == 128) + return true; + } + return false; +} + +bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateSmallEnough( + const Type *Base, uint64_t Members) const { + // Vector and fp128 types require one register, other floating point types + // require one or two registers depending on their size. + uint32_t NumRegs = + ((getContext().getTargetInfo().hasFloat128Type() && + Base->isFloat128Type()) || + Base->isVectorType()) ? 1 + : (getContext().getTypeSize(Base) + 63) / 64; + + // Homogeneous Aggregates may occupy at most 8 registers. + return Members * NumRegs <= 8; +} + +ABIArgInfo +PPC64_SVR4_ABIInfo::classifyArgumentType(QualType Ty) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + if (Ty->isAnyComplexType()) + return ABIArgInfo::getDirect(); + + // Non-Altivec vector types are passed in GPRs (smaller than 16 bytes) + // or via reference (larger than 16 bytes). + if (Ty->isVectorType()) { + uint64_t Size = getContext().getTypeSize(Ty); + if (Size > 128) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + else if (Size < 128) { + llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size); + return ABIArgInfo::getDirect(CoerceTy); + } + } + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() > 128) + return getNaturalAlignIndirect(Ty, /*ByVal=*/true); + + if (isAggregateTypeForABI(Ty)) { + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + uint64_t ABIAlign = getParamTypeAlignment(Ty).getQuantity(); + uint64_t TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity(); + + // ELFv2 homogeneous aggregates are passed as array types. + const Type *Base = nullptr; + uint64_t Members = 0; + if (Kind == PPC64_SVR4_ABIKind::ELFv2 && + isHomogeneousAggregate(Ty, Base, Members)) { + llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0)); + llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members); + return ABIArgInfo::getDirect(CoerceTy); + } + + // If an aggregate may end up fully in registers, we do not + // use the ByVal method, but pass the aggregate as array. + // This is usually beneficial since we avoid forcing the + // back-end to store the argument to memory. + uint64_t Bits = getContext().getTypeSize(Ty); + if (Bits > 0 && Bits <= 8 * GPRBits) { + llvm::Type *CoerceTy; + + // Types up to 8 bytes are passed as integer type (which will be + // properly aligned in the argument save area doubleword). + if (Bits <= GPRBits) + CoerceTy = + llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8)); + // Larger types are passed as arrays, with the base type selected + // according to the required alignment in the save area. + else { + uint64_t RegBits = ABIAlign * 8; + uint64_t NumRegs = llvm::alignTo(Bits, RegBits) / RegBits; + llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), RegBits); + CoerceTy = llvm::ArrayType::get(RegTy, NumRegs); + } + + return ABIArgInfo::getDirect(CoerceTy); + } + + // All other aggregates are passed ByVal. + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign), + /*ByVal=*/true, + /*Realign=*/TyAlign > ABIAlign); + } + + return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); +} + +ABIArgInfo +PPC64_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (RetTy->isAnyComplexType()) + return ABIArgInfo::getDirect(); + + // Non-Altivec vector types are returned in GPRs (smaller than 16 bytes) + // or via reference (larger than 16 bytes). + if (RetTy->isVectorType()) { + uint64_t Size = getContext().getTypeSize(RetTy); + if (Size > 128) + return getNaturalAlignIndirect(RetTy); + else if (Size < 128) { + llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size); + return ABIArgInfo::getDirect(CoerceTy); + } + } + + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > 128) + return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); + + if (isAggregateTypeForABI(RetTy)) { + // ELFv2 homogeneous aggregates are returned as array types. + const Type *Base = nullptr; + uint64_t Members = 0; + if (Kind == PPC64_SVR4_ABIKind::ELFv2 && + isHomogeneousAggregate(RetTy, Base, Members)) { + llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0)); + llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members); + return ABIArgInfo::getDirect(CoerceTy); + } + + // ELFv2 small aggregates are returned in up to two registers. + uint64_t Bits = getContext().getTypeSize(RetTy); + if (Kind == PPC64_SVR4_ABIKind::ELFv2 && Bits <= 2 * GPRBits) { + if (Bits == 0) + return ABIArgInfo::getIgnore(); + + llvm::Type *CoerceTy; + if (Bits > GPRBits) { + CoerceTy = llvm::IntegerType::get(getVMContext(), GPRBits); + CoerceTy = llvm::StructType::get(CoerceTy, CoerceTy); + } else + CoerceTy = + llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8)); + return ABIArgInfo::getDirect(CoerceTy); + } + + // All other aggregates are returned indirectly. + return getNaturalAlignIndirect(RetTy); + } + + return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +// Based on ARMABIInfo::EmitVAArg, adjusted for 64-bit machine. +Address PPC64_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + auto TypeInfo = getContext().getTypeInfoInChars(Ty); + TypeInfo.Align = getParamTypeAlignment(Ty); + + CharUnits SlotSize = CharUnits::fromQuantity(8); + + // If we have a complex type and the base type is smaller than 8 bytes, + // the ABI calls for the real and imaginary parts to be right-adjusted + // in separate doublewords. However, Clang expects us to produce a + // pointer to a structure with the two parts packed tightly. So generate + // loads of the real and imaginary parts relative to the va_list pointer, + // and store them to a temporary structure. + if (const ComplexType *CTy = Ty->getAs()) { + CharUnits EltSize = TypeInfo.Width / 2; + if (EltSize < SlotSize) + return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy); + } + + // Otherwise, just use the general rule. + // + // The PPC64 ABI passes some arguments in integer registers, even to variadic + // functions. To allow va_list to use the simple "void*" representation, + // variadic calls allocate space in the argument area for the integer argument + // registers, and variadic functions spill their integer argument registers to + // this area in their prologues. When aggregates smaller than a register are + // passed this way, they are passed in the least significant bits of the + // register, which means that after spilling on big-endian targets they will + // be right-aligned in their argument slot. This is uncommon; for a variety of + // reasons, other big-endian targets don't end up right-aligning aggregate + // types this way, and so right-alignment only applies to fundamental types. + // So on PPC64, we must force the use of right-alignment even for aggregates. + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo, + SlotSize, /*AllowHigher*/ true, + /*ForceRightAdjust*/ true); +} + +bool +PPC64_SVR4_TargetCodeGenInfo::initDwarfEHRegSizeTable( + CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const { + return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true, + /*IsAIX*/ false); +} + +bool +PPC64TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const { + return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true, + /*IsAIX*/ false); +} + +std::unique_ptr +CodeGen::createAIXTargetCodeGenInfo(CodeGenModule &CGM, bool Is64Bit) { + return std::make_unique(CGM.getTypes(), Is64Bit); +} + +std::unique_ptr +CodeGen::createPPC32TargetCodeGenInfo(CodeGenModule &CGM, bool SoftFloatABI) { + bool RetSmallStructInRegABI = PPC32TargetCodeGenInfo::isStructReturnInRegABI( + CGM.getTriple(), CGM.getCodeGenOpts()); + return std::make_unique(CGM.getTypes(), SoftFloatABI, + RetSmallStructInRegABI); +} + +std::unique_ptr +CodeGen::createPPC64TargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} + +std::unique_ptr CodeGen::createPPC64_SVR4_TargetCodeGenInfo( + CodeGenModule &CGM, PPC64_SVR4_ABIKind Kind, bool SoftFloatABI) { + return std::make_unique(CGM.getTypes(), Kind, + SoftFloatABI); +} diff --git a/clang/lib/CodeGen/Targets/RISCV.cpp b/clang/lib/CodeGen/Targets/RISCV.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/RISCV.cpp @@ -0,0 +1,521 @@ +//===- RISCV.cpp ----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" +#include "llvm/TargetParser/RISCVTargetParser.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// RISC-V ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { +class RISCVABIInfo : public DefaultABIInfo { +private: + // Size of the integer ('x') registers in bits. + unsigned XLen; + // Size of the floating point ('f') registers in bits. Note that the target + // ISA might have a wider FLen than the selected ABI (e.g. an RV32IF target + // with soft float ABI has FLen==0). + unsigned FLen; + static const int NumArgGPRs = 8; + static const int NumArgFPRs = 8; + bool detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff, + llvm::Type *&Field1Ty, + CharUnits &Field1Off, + llvm::Type *&Field2Ty, + CharUnits &Field2Off) const; + +public: + RISCVABIInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen, unsigned FLen) + : DefaultABIInfo(CGT), XLen(XLen), FLen(FLen) {} + + // DefaultABIInfo's classifyReturnType and classifyArgumentType are + // non-virtual, but computeInfo is virtual, so we overload it. + void computeInfo(CGFunctionInfo &FI) const override; + + ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &ArgGPRsLeft, + int &ArgFPRsLeft) const; + ABIArgInfo classifyReturnType(QualType RetTy) const; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + ABIArgInfo extendType(QualType Ty) const; + + bool detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty, + CharUnits &Field1Off, llvm::Type *&Field2Ty, + CharUnits &Field2Off, int &NeededArgGPRs, + int &NeededArgFPRs) const; + ABIArgInfo coerceAndExpandFPCCEligibleStruct(llvm::Type *Field1Ty, + CharUnits Field1Off, + llvm::Type *Field2Ty, + CharUnits Field2Off) const; + + ABIArgInfo coerceVLSVector(QualType Ty) const; +}; +} // end anonymous namespace + +void RISCVABIInfo::computeInfo(CGFunctionInfo &FI) const { + QualType RetTy = FI.getReturnType(); + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(RetTy); + + // IsRetIndirect is true if classifyArgumentType indicated the value should + // be passed indirect, or if the type size is a scalar greater than 2*XLen + // and not a complex type with elements <= FLen. e.g. fp128 is passed direct + // in LLVM IR, relying on the backend lowering code to rewrite the argument + // list and pass indirectly on RV32. + bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect; + if (!IsRetIndirect && RetTy->isScalarType() && + getContext().getTypeSize(RetTy) > (2 * XLen)) { + if (RetTy->isComplexType() && FLen) { + QualType EltTy = RetTy->castAs()->getElementType(); + IsRetIndirect = getContext().getTypeSize(EltTy) > FLen; + } else { + // This is a normal scalar > 2*XLen, such as fp128 on RV32. + IsRetIndirect = true; + } + } + + int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs; + int ArgFPRsLeft = FLen ? NumArgFPRs : 0; + int NumFixedArgs = FI.getNumRequiredArgs(); + + int ArgNum = 0; + for (auto &ArgInfo : FI.arguments()) { + bool IsFixed = ArgNum < NumFixedArgs; + ArgInfo.info = + classifyArgumentType(ArgInfo.type, IsFixed, ArgGPRsLeft, ArgFPRsLeft); + ArgNum++; + } +} + +// Returns true if the struct is a potential candidate for the floating point +// calling convention. If this function returns true, the caller is +// responsible for checking that if there is only a single field then that +// field is a float. +bool RISCVABIInfo::detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff, + llvm::Type *&Field1Ty, + CharUnits &Field1Off, + llvm::Type *&Field2Ty, + CharUnits &Field2Off) const { + bool IsInt = Ty->isIntegralOrEnumerationType(); + bool IsFloat = Ty->isRealFloatingType(); + + if (IsInt || IsFloat) { + uint64_t Size = getContext().getTypeSize(Ty); + if (IsInt && Size > XLen) + return false; + // Can't be eligible if larger than the FP registers. Handling of half + // precision values has been specified in the ABI, so don't block those. + if (IsFloat && Size > FLen) + return false; + // Can't be eligible if an integer type was already found (int+int pairs + // are not eligible). + if (IsInt && Field1Ty && Field1Ty->isIntegerTy()) + return false; + if (!Field1Ty) { + Field1Ty = CGT.ConvertType(Ty); + Field1Off = CurOff; + return true; + } + if (!Field2Ty) { + Field2Ty = CGT.ConvertType(Ty); + Field2Off = CurOff; + return true; + } + return false; + } + + if (auto CTy = Ty->getAs()) { + if (Field1Ty) + return false; + QualType EltTy = CTy->getElementType(); + if (getContext().getTypeSize(EltTy) > FLen) + return false; + Field1Ty = CGT.ConvertType(EltTy); + Field1Off = CurOff; + Field2Ty = Field1Ty; + Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy); + return true; + } + + if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) { + uint64_t ArraySize = ATy->getSize().getZExtValue(); + QualType EltTy = ATy->getElementType(); + CharUnits EltSize = getContext().getTypeSizeInChars(EltTy); + for (uint64_t i = 0; i < ArraySize; ++i) { + bool Ret = detectFPCCEligibleStructHelper(EltTy, CurOff, Field1Ty, + Field1Off, Field2Ty, Field2Off); + if (!Ret) + return false; + CurOff += EltSize; + } + return true; + } + + if (const auto *RTy = Ty->getAs()) { + // Structures with either a non-trivial destructor or a non-trivial + // copy constructor are not eligible for the FP calling convention. + if (getRecordArgABI(Ty, CGT.getCXXABI())) + return false; + if (isEmptyRecord(getContext(), Ty, true)) + return true; + const RecordDecl *RD = RTy->getDecl(); + // Unions aren't eligible unless they're empty (which is caught above). + if (RD->isUnion()) + return false; + const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + for (const CXXBaseSpecifier &B : CXXRD->bases()) { + const auto *BDecl = + cast(B.getType()->castAs()->getDecl()); + CharUnits BaseOff = Layout.getBaseClassOffset(BDecl); + bool Ret = detectFPCCEligibleStructHelper(B.getType(), CurOff + BaseOff, + Field1Ty, Field1Off, Field2Ty, + Field2Off); + if (!Ret) + return false; + } + } + int ZeroWidthBitFieldCount = 0; + for (const FieldDecl *FD : RD->fields()) { + uint64_t FieldOffInBits = Layout.getFieldOffset(FD->getFieldIndex()); + QualType QTy = FD->getType(); + if (FD->isBitField()) { + unsigned BitWidth = FD->getBitWidthValue(getContext()); + // Allow a bitfield with a type greater than XLen as long as the + // bitwidth is XLen or less. + if (getContext().getTypeSize(QTy) > XLen && BitWidth <= XLen) + QTy = getContext().getIntTypeForBitwidth(XLen, false); + if (BitWidth == 0) { + ZeroWidthBitFieldCount++; + continue; + } + } + + bool Ret = detectFPCCEligibleStructHelper( + QTy, CurOff + getContext().toCharUnitsFromBits(FieldOffInBits), + Field1Ty, Field1Off, Field2Ty, Field2Off); + if (!Ret) + return false; + + // As a quirk of the ABI, zero-width bitfields aren't ignored for fp+fp + // or int+fp structs, but are ignored for a struct with an fp field and + // any number of zero-width bitfields. + if (Field2Ty && ZeroWidthBitFieldCount > 0) + return false; + } + return Field1Ty != nullptr; + } + + return false; +} + +// Determine if a struct is eligible for passing according to the floating +// point calling convention (i.e., when flattened it contains a single fp +// value, fp+fp, or int+fp of appropriate size). If so, NeededArgFPRs and +// NeededArgGPRs are incremented appropriately. +bool RISCVABIInfo::detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty, + CharUnits &Field1Off, + llvm::Type *&Field2Ty, + CharUnits &Field2Off, + int &NeededArgGPRs, + int &NeededArgFPRs) const { + Field1Ty = nullptr; + Field2Ty = nullptr; + NeededArgGPRs = 0; + NeededArgFPRs = 0; + bool IsCandidate = detectFPCCEligibleStructHelper( + Ty, CharUnits::Zero(), Field1Ty, Field1Off, Field2Ty, Field2Off); + // Not really a candidate if we have a single int but no float. + if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy()) + return false; + if (!IsCandidate) + return false; + if (Field1Ty && Field1Ty->isFloatingPointTy()) + NeededArgFPRs++; + else if (Field1Ty) + NeededArgGPRs++; + if (Field2Ty && Field2Ty->isFloatingPointTy()) + NeededArgFPRs++; + else if (Field2Ty) + NeededArgGPRs++; + return true; +} + +// Call getCoerceAndExpand for the two-element flattened struct described by +// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an +// appropriate coerceToType and unpaddedCoerceToType. +ABIArgInfo RISCVABIInfo::coerceAndExpandFPCCEligibleStruct( + llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty, + CharUnits Field2Off) const { + SmallVector CoerceElts; + SmallVector UnpaddedCoerceElts; + if (!Field1Off.isZero()) + CoerceElts.push_back(llvm::ArrayType::get( + llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity())); + + CoerceElts.push_back(Field1Ty); + UnpaddedCoerceElts.push_back(Field1Ty); + + if (!Field2Ty) { + return ABIArgInfo::getCoerceAndExpand( + llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()), + UnpaddedCoerceElts[0]); + } + + CharUnits Field2Align = + CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty)); + CharUnits Field1End = Field1Off + + CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty)); + CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align); + + CharUnits Padding = CharUnits::Zero(); + if (Field2Off > Field2OffNoPadNoPack) + Padding = Field2Off - Field2OffNoPadNoPack; + else if (Field2Off != Field2Align && Field2Off > Field1End) + Padding = Field2Off - Field1End; + + bool IsPacked = !Field2Off.isMultipleOf(Field2Align); + + if (!Padding.isZero()) + CoerceElts.push_back(llvm::ArrayType::get( + llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity())); + + CoerceElts.push_back(Field2Ty); + UnpaddedCoerceElts.push_back(Field2Ty); + + auto CoerceToType = + llvm::StructType::get(getVMContext(), CoerceElts, IsPacked); + auto UnpaddedCoerceToType = + llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked); + + return ABIArgInfo::getCoerceAndExpand(CoerceToType, UnpaddedCoerceToType); +} + +// Fixed-length RVV vectors are represented as scalable vectors in function +// args/return and must be coerced from fixed vectors. +ABIArgInfo RISCVABIInfo::coerceVLSVector(QualType Ty) const { + assert(Ty->isVectorType() && "expected vector type!"); + + const auto *VT = Ty->castAs(); + assert(VT->getVectorKind() == VectorType::RVVFixedLengthDataVector && + "Unexpected vector kind"); + + assert(VT->getElementType()->isBuiltinType() && "expected builtin type!"); + + const auto *BT = VT->getElementType()->castAs(); + unsigned EltSize = getContext().getTypeSize(BT); + llvm::ScalableVectorType *ResType = + llvm::ScalableVectorType::get(CGT.ConvertType(VT->getElementType()), + llvm::RISCV::RVVBitsPerBlock / EltSize); + return ABIArgInfo::getDirect(ResType); +} + +ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, bool IsFixed, + int &ArgGPRsLeft, + int &ArgFPRsLeft) const { + assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow"); + Ty = useFirstFieldIfTransparentUnion(Ty); + + // Structures with either a non-trivial destructor or a non-trivial + // copy constructor are always passed indirectly. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) { + if (ArgGPRsLeft) + ArgGPRsLeft -= 1; + return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA == + CGCXXABI::RAA_DirectInMemory); + } + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + uint64_t Size = getContext().getTypeSize(Ty); + + // Pass floating point values via FPRs if possible. + if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() && + FLen >= Size && ArgFPRsLeft) { + ArgFPRsLeft--; + return ABIArgInfo::getDirect(); + } + + // Complex types for the hard float ABI must be passed direct rather than + // using CoerceAndExpand. + if (IsFixed && Ty->isComplexType() && FLen && ArgFPRsLeft >= 2) { + QualType EltTy = Ty->castAs()->getElementType(); + if (getContext().getTypeSize(EltTy) <= FLen) { + ArgFPRsLeft -= 2; + return ABIArgInfo::getDirect(); + } + } + + if (IsFixed && FLen && Ty->isStructureOrClassType()) { + llvm::Type *Field1Ty = nullptr; + llvm::Type *Field2Ty = nullptr; + CharUnits Field1Off = CharUnits::Zero(); + CharUnits Field2Off = CharUnits::Zero(); + int NeededArgGPRs = 0; + int NeededArgFPRs = 0; + bool IsCandidate = + detectFPCCEligibleStruct(Ty, Field1Ty, Field1Off, Field2Ty, Field2Off, + NeededArgGPRs, NeededArgFPRs); + if (IsCandidate && NeededArgGPRs <= ArgGPRsLeft && + NeededArgFPRs <= ArgFPRsLeft) { + ArgGPRsLeft -= NeededArgGPRs; + ArgFPRsLeft -= NeededArgFPRs; + return coerceAndExpandFPCCEligibleStruct(Field1Ty, Field1Off, Field2Ty, + Field2Off); + } + } + + uint64_t NeededAlign = getContext().getTypeAlign(Ty); + // Determine the number of GPRs needed to pass the current argument + // according to the ABI. 2*XLen-aligned varargs are passed in "aligned" + // register pairs, so may consume 3 registers. + int NeededArgGPRs = 1; + if (!IsFixed && NeededAlign == 2 * XLen) + NeededArgGPRs = 2 + (ArgGPRsLeft % 2); + else if (Size > XLen && Size <= 2 * XLen) + NeededArgGPRs = 2; + + if (NeededArgGPRs > ArgGPRsLeft) { + NeededArgGPRs = ArgGPRsLeft; + } + + ArgGPRsLeft -= NeededArgGPRs; + + if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // All integral types are promoted to XLen width + if (Size < XLen && Ty->isIntegralOrEnumerationType()) { + return extendType(Ty); + } + + if (const auto *EIT = Ty->getAs()) { + if (EIT->getNumBits() < XLen) + return extendType(Ty); + if (EIT->getNumBits() > 128 || + (!getContext().getTargetInfo().hasInt128Type() && + EIT->getNumBits() > 64)) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + } + + return ABIArgInfo::getDirect(); + } + + if (const VectorType *VT = Ty->getAs()) + if (VT->getVectorKind() == VectorType::RVVFixedLengthDataVector) + return coerceVLSVector(Ty); + + // Aggregates which are <= 2*XLen will be passed in registers if possible, + // so coerce to integers. + if (Size <= 2 * XLen) { + unsigned Alignment = getContext().getTypeAlign(Ty); + + // Use a single XLen int if possible, 2*XLen if 2*XLen alignment is + // required, and a 2-element XLen array if only XLen alignment is required. + if (Size <= XLen) { + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), XLen)); + } else if (Alignment == 2 * XLen) { + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), 2 * XLen)); + } else { + return ABIArgInfo::getDirect(llvm::ArrayType::get( + llvm::IntegerType::get(getVMContext(), XLen), 2)); + } + } + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); +} + +ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + int ArgGPRsLeft = 2; + int ArgFPRsLeft = FLen ? 2 : 0; + + // The rules for return and argument types are the same, so defer to + // classifyArgumentType. + return classifyArgumentType(RetTy, /*IsFixed=*/true, ArgGPRsLeft, + ArgFPRsLeft); +} + +Address RISCVABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8); + + // Empty records are ignored for parameter passing purposes. + if (isEmptyRecord(getContext(), Ty, true)) { + Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr), + getVAListElementType(CGF), SlotSize); + Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty)); + return Addr; + } + + auto TInfo = getContext().getTypeInfoInChars(Ty); + + // Arguments bigger than 2*Xlen bytes are passed indirectly. + bool IsIndirect = TInfo.Width > 2 * SlotSize; + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TInfo, + SlotSize, /*AllowHigherAlign=*/true); +} + +ABIArgInfo RISCVABIInfo::extendType(QualType Ty) const { + int TySize = getContext().getTypeSize(Ty); + // RV64 ABI requires unsigned 32 bit integers to be sign extended. + if (XLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32) + return ABIArgInfo::getSignExtend(Ty); + return ABIArgInfo::getExtend(Ty); +} + +namespace { +class RISCVTargetCodeGenInfo : public TargetCodeGenInfo { +public: + RISCVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen, + unsigned FLen) + : TargetCodeGenInfo(std::make_unique(CGT, XLen, FLen)) {} + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + const auto *FD = dyn_cast_or_null(D); + if (!FD) return; + + const auto *Attr = FD->getAttr(); + if (!Attr) + return; + + const char *Kind; + switch (Attr->getInterrupt()) { + case RISCVInterruptAttr::supervisor: Kind = "supervisor"; break; + case RISCVInterruptAttr::machine: Kind = "machine"; break; + } + + auto *Fn = cast(GV); + + Fn->addFnAttr("interrupt", Kind); + } +}; +} // namespace + +std::unique_ptr +CodeGen::createRISCVTargetCodeGenInfo(CodeGenModule &CGM, unsigned XLen, + unsigned FLen) { + return std::make_unique(CGM.getTypes(), XLen, FLen); +} diff --git a/clang/lib/CodeGen/Targets/SPIR.cpp b/clang/lib/CodeGen/Targets/SPIR.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/SPIR.cpp @@ -0,0 +1,218 @@ +//===- SPIR.cpp -----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// Base ABI and target codegen info implementation common between SPIR and +// SPIR-V. +//===----------------------------------------------------------------------===// + +namespace { +class CommonSPIRABIInfo : public DefaultABIInfo { +public: + CommonSPIRABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) { setCCs(); } + +private: + void setCCs(); +}; + +class SPIRVABIInfo : public CommonSPIRABIInfo { +public: + SPIRVABIInfo(CodeGenTypes &CGT) : CommonSPIRABIInfo(CGT) {} + void computeInfo(CGFunctionInfo &FI) const override; + +private: + ABIArgInfo classifyKernelArgumentType(QualType Ty) const; +}; +} // end anonymous namespace +namespace { +class CommonSPIRTargetCodeGenInfo : public TargetCodeGenInfo { +public: + CommonSPIRTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + CommonSPIRTargetCodeGenInfo(std::unique_ptr ABIInfo) + : TargetCodeGenInfo(std::move(ABIInfo)) {} + + LangAS getASTAllocaAddressSpace() const override { + return getLangASFromTargetAS( + getABIInfo().getDataLayout().getAllocaAddrSpace()); + } + + unsigned getOpenCLKernelCallingConv() const override; + llvm::Type *getOpenCLType(CodeGenModule &CGM, const Type *T) const override; +}; +class SPIRVTargetCodeGenInfo : public CommonSPIRTargetCodeGenInfo { +public: + SPIRVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) + : CommonSPIRTargetCodeGenInfo(std::make_unique(CGT)) {} + void setCUDAKernelCallingConvention(const FunctionType *&FT) const override; +}; +} // End anonymous namespace. + +void CommonSPIRABIInfo::setCCs() { + assert(getRuntimeCC() == llvm::CallingConv::C); + RuntimeCC = llvm::CallingConv::SPIR_FUNC; +} + +ABIArgInfo SPIRVABIInfo::classifyKernelArgumentType(QualType Ty) const { + if (getContext().getLangOpts().CUDAIsDevice) { + // Coerce pointer arguments with default address space to CrossWorkGroup + // pointers for HIPSPV/CUDASPV. When the language mode is HIP/CUDA, the + // SPIRTargetInfo maps cuda_device to SPIR-V's CrossWorkGroup address space. + llvm::Type *LTy = CGT.ConvertType(Ty); + auto DefaultAS = getContext().getTargetAddressSpace(LangAS::Default); + auto GlobalAS = getContext().getTargetAddressSpace(LangAS::cuda_device); + auto *PtrTy = llvm::dyn_cast(LTy); + if (PtrTy && PtrTy->getAddressSpace() == DefaultAS) { + LTy = llvm::PointerType::get(PtrTy->getContext(), GlobalAS); + return ABIArgInfo::getDirect(LTy, 0, nullptr, false); + } + + // Force copying aggregate type in kernel arguments by value when + // compiling CUDA targeting SPIR-V. This is required for the object + // copied to be valid on the device. + // This behavior follows the CUDA spec + // https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#global-function-argument-processing, + // and matches the NVPTX implementation. + if (isAggregateTypeForABI(Ty)) + return getNaturalAlignIndirect(Ty, /* byval */ true); + } + return classifyArgumentType(Ty); +} + +void SPIRVABIInfo::computeInfo(CGFunctionInfo &FI) const { + // The logic is same as in DefaultABIInfo with an exception on the kernel + // arguments handling. + llvm::CallingConv::ID CC = FI.getCallingConvention(); + + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + + for (auto &I : FI.arguments()) { + if (CC == llvm::CallingConv::SPIR_KERNEL) { + I.info = classifyKernelArgumentType(I.type); + } else { + I.info = classifyArgumentType(I.type); + } + } +} + +namespace clang { +namespace CodeGen { +void computeSPIRKernelABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI) { + if (CGM.getTarget().getTriple().isSPIRV()) + SPIRVABIInfo(CGM.getTypes()).computeInfo(FI); + else + CommonSPIRABIInfo(CGM.getTypes()).computeInfo(FI); +} +} +} + +unsigned CommonSPIRTargetCodeGenInfo::getOpenCLKernelCallingConv() const { + return llvm::CallingConv::SPIR_KERNEL; +} + +void SPIRVTargetCodeGenInfo::setCUDAKernelCallingConvention( + const FunctionType *&FT) const { + // Convert HIP kernels to SPIR-V kernels. + if (getABIInfo().getContext().getLangOpts().HIP) { + FT = getABIInfo().getContext().adjustFunctionType( + FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel)); + return; + } +} + +/// Construct a SPIR-V target extension type for the given OpenCL image type. +static llvm::Type *getSPIRVImageType(llvm::LLVMContext &Ctx, StringRef BaseType, + StringRef OpenCLName, + unsigned AccessQualifier) { + // These parameters compare to the operands of OpTypeImage (see + // https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpTypeImage + // for more details). The first 6 integer parameters all default to 0, and + // will be changed to 1 only for the image type(s) that set the parameter to + // one. The 7th integer parameter is the access qualifier, which is tacked on + // at the end. + SmallVector IntParams = {0, 0, 0, 0, 0, 0}; + + // Choose the dimension of the image--this corresponds to the Dim enum in + // SPIR-V (first integer parameter of OpTypeImage). + if (OpenCLName.startswith("image2d")) + IntParams[0] = 1; // 1D + else if (OpenCLName.startswith("image3d")) + IntParams[0] = 2; // 2D + else if (OpenCLName == "image1d_buffer") + IntParams[0] = 5; // Buffer + else + assert(OpenCLName.startswith("image1d") && "Unknown image type"); + + // Set the other integer parameters of OpTypeImage if necessary. Note that the + // OpenCL image types don't provide any information for the Sampled or + // Image Format parameters. + if (OpenCLName.contains("_depth")) + IntParams[1] = 1; + if (OpenCLName.contains("_array")) + IntParams[2] = 1; + if (OpenCLName.contains("_msaa")) + IntParams[3] = 1; + + // Access qualifier + IntParams.push_back(AccessQualifier); + + return llvm::TargetExtType::get(Ctx, BaseType, {llvm::Type::getVoidTy(Ctx)}, + IntParams); +} + +llvm::Type *CommonSPIRTargetCodeGenInfo::getOpenCLType(CodeGenModule &CGM, + const Type *Ty) const { + llvm::LLVMContext &Ctx = CGM.getLLVMContext(); + if (auto *PipeTy = dyn_cast(Ty)) + return llvm::TargetExtType::get(Ctx, "spirv.Pipe", {}, + {!PipeTy->isReadOnly()}); + if (auto *BuiltinTy = dyn_cast(Ty)) { + enum AccessQualifier : unsigned { AQ_ro = 0, AQ_wo = 1, AQ_rw = 2 }; + switch (BuiltinTy->getKind()) { +#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ + case BuiltinType::Id: \ + return getSPIRVImageType(Ctx, "spirv.Image", #ImgType, AQ_##Suffix); +#include "clang/Basic/OpenCLImageTypes.def" + case BuiltinType::OCLSampler: + return llvm::TargetExtType::get(Ctx, "spirv.Sampler"); + case BuiltinType::OCLEvent: + return llvm::TargetExtType::get(Ctx, "spirv.Event"); + case BuiltinType::OCLClkEvent: + return llvm::TargetExtType::get(Ctx, "spirv.DeviceEvent"); + case BuiltinType::OCLQueue: + return llvm::TargetExtType::get(Ctx, "spirv.Queue"); + case BuiltinType::OCLReserveID: + return llvm::TargetExtType::get(Ctx, "spirv.ReserveId"); +#define INTEL_SUBGROUP_AVC_TYPE(Name, Id) \ + case BuiltinType::OCLIntelSubgroupAVC##Id: \ + return llvm::TargetExtType::get(Ctx, "spirv.Avc" #Id "INTEL"); +#include "clang/Basic/OpenCLExtensionTypes.def" + default: + return nullptr; + } + } + + return nullptr; +} + +std::unique_ptr +CodeGen::createCommonSPIRTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} + +std::unique_ptr +CodeGen::createSPIRVTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/Sparc.cpp b/clang/lib/CodeGen/Targets/Sparc.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/Sparc.cpp @@ -0,0 +1,409 @@ +//===- Sparc.cpp ----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// SPARC v8 ABI Implementation. +// Based on the SPARC Compliance Definition version 2.4.1. +// +// Ensures that complex values are passed in registers. +// +namespace { +class SparcV8ABIInfo : public DefaultABIInfo { +public: + SparcV8ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + +private: + ABIArgInfo classifyReturnType(QualType RetTy) const; + void computeInfo(CGFunctionInfo &FI) const override; +}; +} // end anonymous namespace + + +ABIArgInfo +SparcV8ABIInfo::classifyReturnType(QualType Ty) const { + if (Ty->isAnyComplexType()) { + return ABIArgInfo::getDirect(); + } + else { + return DefaultABIInfo::classifyReturnType(Ty); + } +} + +void SparcV8ABIInfo::computeInfo(CGFunctionInfo &FI) const { + + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &Arg : FI.arguments()) + Arg.info = classifyArgumentType(Arg.type); +} + +namespace { +class SparcV8TargetCodeGenInfo : public TargetCodeGenInfo { +public: + SparcV8TargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + + llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + int Offset; + if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType())) + Offset = 12; + else + Offset = 8; + return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, + llvm::ConstantInt::get(CGF.Int32Ty, Offset)); + } + + llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + int Offset; + if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType())) + Offset = -12; + else + Offset = -8; + return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, + llvm::ConstantInt::get(CGF.Int32Ty, Offset)); + } +}; +} // end anonymous namespace + +//===----------------------------------------------------------------------===// +// SPARC v9 ABI Implementation. +// Based on the SPARC Compliance Definition version 2.4.1. +// +// Function arguments a mapped to a nominal "parameter array" and promoted to +// registers depending on their type. Each argument occupies 8 or 16 bytes in +// the array, structs larger than 16 bytes are passed indirectly. +// +// One case requires special care: +// +// struct mixed { +// int i; +// float f; +// }; +// +// When a struct mixed is passed by value, it only occupies 8 bytes in the +// parameter array, but the int is passed in an integer register, and the float +// is passed in a floating point register. This is represented as two arguments +// with the LLVM IR inreg attribute: +// +// declare void f(i32 inreg %i, float inreg %f) +// +// The code generator will only allocate 4 bytes from the parameter array for +// the inreg arguments. All other arguments are allocated a multiple of 8 +// bytes. +// +namespace { +class SparcV9ABIInfo : public ABIInfo { +public: + SparcV9ABIInfo(CodeGenTypes &CGT) : ABIInfo(CGT) {} + +private: + ABIArgInfo classifyType(QualType RetTy, unsigned SizeLimit) const; + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + // Coercion type builder for structs passed in registers. The coercion type + // serves two purposes: + // + // 1. Pad structs to a multiple of 64 bits, so they are passed 'left-aligned' + // in registers. + // 2. Expose aligned floating point elements as first-level elements, so the + // code generator knows to pass them in floating point registers. + // + // We also compute the InReg flag which indicates that the struct contains + // aligned 32-bit floats. + // + struct CoerceBuilder { + llvm::LLVMContext &Context; + const llvm::DataLayout &DL; + SmallVector Elems; + uint64_t Size; + bool InReg; + + CoerceBuilder(llvm::LLVMContext &c, const llvm::DataLayout &dl) + : Context(c), DL(dl), Size(0), InReg(false) {} + + // Pad Elems with integers until Size is ToSize. + void pad(uint64_t ToSize) { + assert(ToSize >= Size && "Cannot remove elements"); + if (ToSize == Size) + return; + + // Finish the current 64-bit word. + uint64_t Aligned = llvm::alignTo(Size, 64); + if (Aligned > Size && Aligned <= ToSize) { + Elems.push_back(llvm::IntegerType::get(Context, Aligned - Size)); + Size = Aligned; + } + + // Add whole 64-bit words. + while (Size + 64 <= ToSize) { + Elems.push_back(llvm::Type::getInt64Ty(Context)); + Size += 64; + } + + // Final in-word padding. + if (Size < ToSize) { + Elems.push_back(llvm::IntegerType::get(Context, ToSize - Size)); + Size = ToSize; + } + } + + // Add a floating point element at Offset. + void addFloat(uint64_t Offset, llvm::Type *Ty, unsigned Bits) { + // Unaligned floats are treated as integers. + if (Offset % Bits) + return; + // The InReg flag is only required if there are any floats < 64 bits. + if (Bits < 64) + InReg = true; + pad(Offset); + Elems.push_back(Ty); + Size = Offset + Bits; + } + + // Add a struct type to the coercion type, starting at Offset (in bits). + void addStruct(uint64_t Offset, llvm::StructType *StrTy) { + const llvm::StructLayout *Layout = DL.getStructLayout(StrTy); + for (unsigned i = 0, e = StrTy->getNumElements(); i != e; ++i) { + llvm::Type *ElemTy = StrTy->getElementType(i); + uint64_t ElemOffset = Offset + Layout->getElementOffsetInBits(i); + switch (ElemTy->getTypeID()) { + case llvm::Type::StructTyID: + addStruct(ElemOffset, cast(ElemTy)); + break; + case llvm::Type::FloatTyID: + addFloat(ElemOffset, ElemTy, 32); + break; + case llvm::Type::DoubleTyID: + addFloat(ElemOffset, ElemTy, 64); + break; + case llvm::Type::FP128TyID: + addFloat(ElemOffset, ElemTy, 128); + break; + case llvm::Type::PointerTyID: + if (ElemOffset % 64 == 0) { + pad(ElemOffset); + Elems.push_back(ElemTy); + Size += 64; + } + break; + default: + break; + } + } + } + + // Check if Ty is a usable substitute for the coercion type. + bool isUsableType(llvm::StructType *Ty) const { + return llvm::ArrayRef(Elems) == Ty->elements(); + } + + // Get the coercion type as a literal struct type. + llvm::Type *getType() const { + if (Elems.size() == 1) + return Elems.front(); + else + return llvm::StructType::get(Context, Elems); + } + }; +}; +} // end anonymous namespace + +ABIArgInfo +SparcV9ABIInfo::classifyType(QualType Ty, unsigned SizeLimit) const { + if (Ty->isVoidType()) + return ABIArgInfo::getIgnore(); + + uint64_t Size = getContext().getTypeSize(Ty); + + // Anything too big to fit in registers is passed with an explicit indirect + // pointer / sret pointer. + if (Size > SizeLimit) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // Integer types smaller than a register are extended. + if (Size < 64 && Ty->isIntegerType()) + return ABIArgInfo::getExtend(Ty); + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() < 64) + return ABIArgInfo::getExtend(Ty); + + // Other non-aggregates go in registers. + if (!isAggregateTypeForABI(Ty)) + return ABIArgInfo::getDirect(); + + // If a C++ object has either a non-trivial copy constructor or a non-trivial + // destructor, it is passed with an explicit indirect pointer / sret pointer. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + // This is a small aggregate type that should be passed in registers. + // Build a coercion type from the LLVM struct type. + llvm::StructType *StrTy = dyn_cast(CGT.ConvertType(Ty)); + if (!StrTy) + return ABIArgInfo::getDirect(); + + CoerceBuilder CB(getVMContext(), getDataLayout()); + CB.addStruct(0, StrTy); + CB.pad(llvm::alignTo(CB.DL.getTypeSizeInBits(StrTy), 64)); + + // Try to use the original type for coercion. + llvm::Type *CoerceTy = CB.isUsableType(StrTy) ? StrTy : CB.getType(); + + if (CB.InReg) + return ABIArgInfo::getDirectInReg(CoerceTy); + else + return ABIArgInfo::getDirect(CoerceTy); +} + +Address SparcV9ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + ABIArgInfo AI = classifyType(Ty, 16 * 8); + llvm::Type *ArgTy = CGT.ConvertType(Ty); + if (AI.canHaveCoerceToType() && !AI.getCoerceToType()) + AI.setCoerceToType(ArgTy); + + CharUnits SlotSize = CharUnits::fromQuantity(8); + + CGBuilderTy &Builder = CGF.Builder; + Address Addr = Address(Builder.CreateLoad(VAListAddr, "ap.cur"), + getVAListElementType(CGF), SlotSize); + llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy); + + auto TypeInfo = getContext().getTypeInfoInChars(Ty); + + Address ArgAddr = Address::invalid(); + CharUnits Stride; + switch (AI.getKind()) { + case ABIArgInfo::Expand: + case ABIArgInfo::CoerceAndExpand: + case ABIArgInfo::InAlloca: + llvm_unreachable("Unsupported ABI kind for va_arg"); + + case ABIArgInfo::Extend: { + Stride = SlotSize; + CharUnits Offset = SlotSize - TypeInfo.Width; + ArgAddr = Builder.CreateConstInBoundsByteGEP(Addr, Offset, "extend"); + break; + } + + case ABIArgInfo::Direct: { + auto AllocSize = getDataLayout().getTypeAllocSize(AI.getCoerceToType()); + Stride = CharUnits::fromQuantity(AllocSize).alignTo(SlotSize); + ArgAddr = Addr; + break; + } + + case ABIArgInfo::Indirect: + case ABIArgInfo::IndirectAliased: + Stride = SlotSize; + ArgAddr = Builder.CreateElementBitCast(Addr, ArgPtrTy, "indirect"); + ArgAddr = Address(Builder.CreateLoad(ArgAddr, "indirect.arg"), ArgTy, + TypeInfo.Align); + break; + + case ABIArgInfo::Ignore: + return Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeInfo.Align); + } + + // Update VAList. + Address NextPtr = Builder.CreateConstInBoundsByteGEP(Addr, Stride, "ap.next"); + Builder.CreateStore(NextPtr.getPointer(), VAListAddr); + + return Builder.CreateElementBitCast(ArgAddr, ArgTy, "arg.addr"); +} + +void SparcV9ABIInfo::computeInfo(CGFunctionInfo &FI) const { + FI.getReturnInfo() = classifyType(FI.getReturnType(), 32 * 8); + for (auto &I : FI.arguments()) + I.info = classifyType(I.type, 16 * 8); +} + +namespace { +class SparcV9TargetCodeGenInfo : public TargetCodeGenInfo { +public: + SparcV9TargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override { + return 14; + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; + + llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, + llvm::ConstantInt::get(CGF.Int32Ty, 8)); + } + + llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + return CGF.Builder.CreateGEP(CGF.Int8Ty, Address, + llvm::ConstantInt::get(CGF.Int32Ty, -8)); + } +}; +} // end anonymous namespace + +bool +SparcV9TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const { + // This is calculated from the LLVM and GCC tables and verified + // against gcc output. AFAIK all ABIs use the same encoding. + + CodeGen::CGBuilderTy &Builder = CGF.Builder; + + llvm::IntegerType *i8 = CGF.Int8Ty; + llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4); + llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8); + + // 0-31: the 8-byte general-purpose registers + AssignToArrayRange(Builder, Address, Eight8, 0, 31); + + // 32-63: f0-31, the 4-byte floating-point registers + AssignToArrayRange(Builder, Address, Four8, 32, 63); + + // Y = 64 + // PSR = 65 + // WIM = 66 + // TBR = 67 + // PC = 68 + // NPC = 69 + // FSR = 70 + // CSR = 71 + AssignToArrayRange(Builder, Address, Eight8, 64, 71); + + // 72-87: d0-15, the 8-byte floating-point registers + AssignToArrayRange(Builder, Address, Eight8, 72, 87); + + return false; +} + +std::unique_ptr +CodeGen::createSparcV8TargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} + +std::unique_ptr +CodeGen::createSparcV9TargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/SystemZ.cpp b/clang/lib/CodeGen/Targets/SystemZ.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/SystemZ.cpp @@ -0,0 +1,541 @@ +//===- SystemZ.cpp --------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" +#include "clang/Basic/Builtins.h" +#include "llvm/IR/IntrinsicsS390.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// SystemZ ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +class SystemZABIInfo : public ABIInfo { + bool HasVector; + bool IsSoftFloatABI; + +public: + SystemZABIInfo(CodeGenTypes &CGT, bool HV, bool SF) + : ABIInfo(CGT), HasVector(HV), IsSoftFloatABI(SF) {} + + bool isPromotableIntegerTypeForABI(QualType Ty) const; + bool isCompoundType(QualType Ty) const; + bool isVectorArgumentType(QualType Ty) const; + bool isFPArgumentType(QualType Ty) const; + QualType GetSingleElementType(QualType Ty) const; + + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType ArgTy) const; + + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +class SystemZTargetCodeGenInfo : public TargetCodeGenInfo { + ASTContext &Ctx; + + // These are used for speeding up the search for a visible vector ABI. + mutable bool HasVisibleVecABIFlag = false; + mutable std::set SeenTypes; + + // Returns true (the first time) if Ty is, or is found to include, a vector + // type that exposes the vector ABI. This is any vector >=16 bytes which + // with vector support are aligned to only 8 bytes. When IsParam is true, + // the type belongs to a value as passed between functions. If it is a + // vector <=16 bytes it will be passed in a vector register (if supported). + bool isVectorTypeBased(const Type *Ty, bool IsParam) const; + +public: + SystemZTargetCodeGenInfo(CodeGenTypes &CGT, bool HasVector, bool SoftFloatABI) + : TargetCodeGenInfo( + std::make_unique(CGT, HasVector, SoftFloatABI)), + Ctx(CGT.getContext()) { + SwiftInfo = + std::make_unique(CGT, /*SwiftErrorInRegister=*/false); + } + + // The vector ABI is different when the vector facility is present and when + // a module e.g. defines an externally visible vector variable, a flag + // indicating a visible vector ABI is added. Eventually this will result in + // a GNU attribute indicating the vector ABI of the module. Ty is the type + // of a variable or function parameter that is globally visible. + void handleExternallyVisibleObjABI(const Type *Ty, CodeGen::CodeGenModule &M, + bool IsParam) const { + if (!HasVisibleVecABIFlag && isVectorTypeBased(Ty, IsParam)) { + M.getModule().addModuleFlag(llvm::Module::Warning, + "s390x-visible-vector-ABI", 1); + HasVisibleVecABIFlag = true; + } + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &M) const override { + if (!D) + return; + + // Check if the vector ABI becomes visible by an externally visible + // variable or function. + if (const auto *VD = dyn_cast(D)) { + if (VD->isExternallyVisible()) + handleExternallyVisibleObjABI(VD->getType().getTypePtr(), M, + /*IsParam*/false); + } + else if (const FunctionDecl *FD = dyn_cast(D)) { + if (FD->isExternallyVisible()) + handleExternallyVisibleObjABI(FD->getType().getTypePtr(), M, + /*IsParam*/false); + } + } + + llvm::Value *testFPKind(llvm::Value *V, unsigned BuiltinID, + CGBuilderTy &Builder, + CodeGenModule &CGM) const override { + assert(V->getType()->isFloatingPointTy() && "V should have an FP type."); + // Only use TDC in constrained FP mode. + if (!Builder.getIsFPConstrained()) + return nullptr; + + llvm::Type *Ty = V->getType(); + if (Ty->isFloatTy() || Ty->isDoubleTy() || Ty->isFP128Ty()) { + llvm::Module &M = CGM.getModule(); + auto &Ctx = M.getContext(); + llvm::Function *TDCFunc = + llvm::Intrinsic::getDeclaration(&M, llvm::Intrinsic::s390_tdc, Ty); + unsigned TDCBits = 0; + switch (BuiltinID) { + case Builtin::BI__builtin_isnan: + TDCBits = 0xf; + break; + case Builtin::BIfinite: + case Builtin::BI__finite: + case Builtin::BIfinitef: + case Builtin::BI__finitef: + case Builtin::BIfinitel: + case Builtin::BI__finitel: + case Builtin::BI__builtin_isfinite: + TDCBits = 0xfc0; + break; + case Builtin::BI__builtin_isinf: + TDCBits = 0x30; + break; + default: + break; + } + if (TDCBits) + return Builder.CreateCall( + TDCFunc, + {V, llvm::ConstantInt::get(llvm::Type::getInt64Ty(Ctx), TDCBits)}); + } + return nullptr; + } +}; +} + +bool SystemZABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + // Promotable integer types are required to be promoted by the ABI. + if (ABIInfo::isPromotableIntegerTypeForABI(Ty)) + return true; + + if (const auto *EIT = Ty->getAs()) + if (EIT->getNumBits() < 64) + return true; + + // 32-bit values must also be promoted. + if (const BuiltinType *BT = Ty->getAs()) + switch (BT->getKind()) { + case BuiltinType::Int: + case BuiltinType::UInt: + return true; + default: + return false; + } + return false; +} + +bool SystemZABIInfo::isCompoundType(QualType Ty) const { + return (Ty->isAnyComplexType() || + Ty->isVectorType() || + isAggregateTypeForABI(Ty)); +} + +bool SystemZABIInfo::isVectorArgumentType(QualType Ty) const { + return (HasVector && + Ty->isVectorType() && + getContext().getTypeSize(Ty) <= 128); +} + +bool SystemZABIInfo::isFPArgumentType(QualType Ty) const { + if (IsSoftFloatABI) + return false; + + if (const BuiltinType *BT = Ty->getAs()) + switch (BT->getKind()) { + case BuiltinType::Float: + case BuiltinType::Double: + return true; + default: + return false; + } + + return false; +} + +QualType SystemZABIInfo::GetSingleElementType(QualType Ty) const { + const RecordType *RT = Ty->getAs(); + + if (RT && RT->isStructureOrClassType()) { + const RecordDecl *RD = RT->getDecl(); + QualType Found; + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) + if (CXXRD->hasDefinition()) + for (const auto &I : CXXRD->bases()) { + QualType Base = I.getType(); + + // Empty bases don't affect things either way. + if (isEmptyRecord(getContext(), Base, true)) + continue; + + if (!Found.isNull()) + return Ty; + Found = GetSingleElementType(Base); + } + + // Check the fields. + for (const auto *FD : RD->fields()) { + // Unlike isSingleElementStruct(), empty structure and array fields + // do count. So do anonymous bitfields that aren't zero-sized. + + // Like isSingleElementStruct(), ignore C++20 empty data members. + if (FD->hasAttr() && + isEmptyRecord(getContext(), FD->getType(), true)) + continue; + + // Unlike isSingleElementStruct(), arrays do not count. + // Nested structures still do though. + if (!Found.isNull()) + return Ty; + Found = GetSingleElementType(FD->getType()); + } + + // Unlike isSingleElementStruct(), trailing padding is allowed. + // An 8-byte aligned struct s { float f; } is passed as a double. + if (!Found.isNull()) + return Found; + } + + return Ty; +} + +Address SystemZABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + // Assume that va_list type is correct; should be pointer to LLVM type: + // struct { + // i64 __gpr; + // i64 __fpr; + // i8 *__overflow_arg_area; + // i8 *__reg_save_area; + // }; + + // Every non-vector argument occupies 8 bytes and is passed by preference + // in either GPRs or FPRs. Vector arguments occupy 8 or 16 bytes and are + // always passed on the stack. + const SystemZTargetCodeGenInfo &SZCGI = + static_cast( + CGT.getCGM().getTargetCodeGenInfo()); + Ty = getContext().getCanonicalType(Ty); + auto TyInfo = getContext().getTypeInfoInChars(Ty); + llvm::Type *ArgTy = CGF.ConvertTypeForMem(Ty); + llvm::Type *DirectTy = ArgTy; + ABIArgInfo AI = classifyArgumentType(Ty); + bool IsIndirect = AI.isIndirect(); + bool InFPRs = false; + bool IsVector = false; + CharUnits UnpaddedSize; + CharUnits DirectAlign; + SZCGI.handleExternallyVisibleObjABI(Ty.getTypePtr(), CGT.getCGM(), + /*IsParam*/true); + if (IsIndirect) { + DirectTy = llvm::PointerType::getUnqual(DirectTy); + UnpaddedSize = DirectAlign = CharUnits::fromQuantity(8); + } else { + if (AI.getCoerceToType()) + ArgTy = AI.getCoerceToType(); + InFPRs = (!IsSoftFloatABI && (ArgTy->isFloatTy() || ArgTy->isDoubleTy())); + IsVector = ArgTy->isVectorTy(); + UnpaddedSize = TyInfo.Width; + DirectAlign = TyInfo.Align; + } + CharUnits PaddedSize = CharUnits::fromQuantity(8); + if (IsVector && UnpaddedSize > PaddedSize) + PaddedSize = CharUnits::fromQuantity(16); + assert((UnpaddedSize <= PaddedSize) && "Invalid argument size."); + + CharUnits Padding = (PaddedSize - UnpaddedSize); + + llvm::Type *IndexTy = CGF.Int64Ty; + llvm::Value *PaddedSizeV = + llvm::ConstantInt::get(IndexTy, PaddedSize.getQuantity()); + + if (IsVector) { + // Work out the address of a vector argument on the stack. + // Vector arguments are always passed in the high bits of a + // single (8 byte) or double (16 byte) stack slot. + Address OverflowArgAreaPtr = + CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr"); + Address OverflowArgArea = + Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"), + CGF.Int8Ty, TyInfo.Align); + Address MemAddr = + CGF.Builder.CreateElementBitCast(OverflowArgArea, DirectTy, "mem_addr"); + + // Update overflow_arg_area_ptr pointer + llvm::Value *NewOverflowArgArea = CGF.Builder.CreateGEP( + OverflowArgArea.getElementType(), OverflowArgArea.getPointer(), + PaddedSizeV, "overflow_arg_area"); + CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr); + + return MemAddr; + } + + assert(PaddedSize.getQuantity() == 8); + + unsigned MaxRegs, RegCountField, RegSaveIndex; + CharUnits RegPadding; + if (InFPRs) { + MaxRegs = 4; // Maximum of 4 FPR arguments + RegCountField = 1; // __fpr + RegSaveIndex = 16; // save offset for f0 + RegPadding = CharUnits(); // floats are passed in the high bits of an FPR + } else { + MaxRegs = 5; // Maximum of 5 GPR arguments + RegCountField = 0; // __gpr + RegSaveIndex = 2; // save offset for r2 + RegPadding = Padding; // values are passed in the low bits of a GPR + } + + Address RegCountPtr = + CGF.Builder.CreateStructGEP(VAListAddr, RegCountField, "reg_count_ptr"); + llvm::Value *RegCount = CGF.Builder.CreateLoad(RegCountPtr, "reg_count"); + llvm::Value *MaxRegsV = llvm::ConstantInt::get(IndexTy, MaxRegs); + llvm::Value *InRegs = CGF.Builder.CreateICmpULT(RegCount, MaxRegsV, + "fits_in_regs"); + + llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); + llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem"); + llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); + CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock); + + // Emit code to load the value if it was passed in registers. + CGF.EmitBlock(InRegBlock); + + // Work out the address of an argument register. + llvm::Value *ScaledRegCount = + CGF.Builder.CreateMul(RegCount, PaddedSizeV, "scaled_reg_count"); + llvm::Value *RegBase = + llvm::ConstantInt::get(IndexTy, RegSaveIndex * PaddedSize.getQuantity() + + RegPadding.getQuantity()); + llvm::Value *RegOffset = + CGF.Builder.CreateAdd(ScaledRegCount, RegBase, "reg_offset"); + Address RegSaveAreaPtr = + CGF.Builder.CreateStructGEP(VAListAddr, 3, "reg_save_area_ptr"); + llvm::Value *RegSaveArea = + CGF.Builder.CreateLoad(RegSaveAreaPtr, "reg_save_area"); + Address RawRegAddr( + CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, RegOffset, "raw_reg_addr"), + CGF.Int8Ty, PaddedSize); + Address RegAddr = + CGF.Builder.CreateElementBitCast(RawRegAddr, DirectTy, "reg_addr"); + + // Update the register count + llvm::Value *One = llvm::ConstantInt::get(IndexTy, 1); + llvm::Value *NewRegCount = + CGF.Builder.CreateAdd(RegCount, One, "reg_count"); + CGF.Builder.CreateStore(NewRegCount, RegCountPtr); + CGF.EmitBranch(ContBlock); + + // Emit code to load the value if it was passed in memory. + CGF.EmitBlock(InMemBlock); + + // Work out the address of a stack argument. + Address OverflowArgAreaPtr = + CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr"); + Address OverflowArgArea = + Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"), + CGF.Int8Ty, PaddedSize); + Address RawMemAddr = + CGF.Builder.CreateConstByteGEP(OverflowArgArea, Padding, "raw_mem_addr"); + Address MemAddr = + CGF.Builder.CreateElementBitCast(RawMemAddr, DirectTy, "mem_addr"); + + // Update overflow_arg_area_ptr pointer + llvm::Value *NewOverflowArgArea = + CGF.Builder.CreateGEP(OverflowArgArea.getElementType(), + OverflowArgArea.getPointer(), PaddedSizeV, + "overflow_arg_area"); + CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr); + CGF.EmitBranch(ContBlock); + + // Return the appropriate result. + CGF.EmitBlock(ContBlock); + Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock, + "va_arg.addr"); + + if (IsIndirect) + ResAddr = Address(CGF.Builder.CreateLoad(ResAddr, "indirect_arg"), ArgTy, + TyInfo.Align); + + return ResAddr; +} + +ABIArgInfo SystemZABIInfo::classifyReturnType(QualType RetTy) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + if (isVectorArgumentType(RetTy)) + return ABIArgInfo::getDirect(); + if (isCompoundType(RetTy) || getContext().getTypeSize(RetTy) > 64) + return getNaturalAlignIndirect(RetTy); + return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +ABIArgInfo SystemZABIInfo::classifyArgumentType(QualType Ty) const { + // Handle the generic C++ ABI. + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + // Integers and enums are extended to full register width. + if (isPromotableIntegerTypeForABI(Ty)) + return ABIArgInfo::getExtend(Ty); + + // Handle vector types and vector-like structure types. Note that + // as opposed to float-like structure types, we do not allow any + // padding for vector-like structures, so verify the sizes match. + uint64_t Size = getContext().getTypeSize(Ty); + QualType SingleElementTy = GetSingleElementType(Ty); + if (isVectorArgumentType(SingleElementTy) && + getContext().getTypeSize(SingleElementTy) == Size) + return ABIArgInfo::getDirect(CGT.ConvertType(SingleElementTy)); + + // Values that are not 1, 2, 4 or 8 bytes in size are passed indirectly. + if (Size != 8 && Size != 16 && Size != 32 && Size != 64) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + + // Handle small structures. + if (const RecordType *RT = Ty->getAs()) { + // Structures with flexible arrays have variable length, so really + // fail the size test above. + const RecordDecl *RD = RT->getDecl(); + if (RD->hasFlexibleArrayMember()) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + + // The structure is passed as an unextended integer, a float, or a double. + llvm::Type *PassTy; + if (isFPArgumentType(SingleElementTy)) { + assert(Size == 32 || Size == 64); + if (Size == 32) + PassTy = llvm::Type::getFloatTy(getVMContext()); + else + PassTy = llvm::Type::getDoubleTy(getVMContext()); + } else + PassTy = llvm::IntegerType::get(getVMContext(), Size); + return ABIArgInfo::getDirect(PassTy); + } + + // Non-structure compounds are passed indirectly. + if (isCompoundType(Ty)) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + + return ABIArgInfo::getDirect(nullptr); +} + +void SystemZABIInfo::computeInfo(CGFunctionInfo &FI) const { + const SystemZTargetCodeGenInfo &SZCGI = + static_cast( + CGT.getCGM().getTargetCodeGenInfo()); + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + unsigned Idx = 0; + for (auto &I : FI.arguments()) { + I.info = classifyArgumentType(I.type); + if (FI.isVariadic() && Idx++ >= FI.getNumRequiredArgs()) + // Check if a vararg vector argument is passed, in which case the + // vector ABI becomes visible as the va_list could be passed on to + // other functions. + SZCGI.handleExternallyVisibleObjABI(I.type.getTypePtr(), CGT.getCGM(), + /*IsParam*/true); + } +} + +bool SystemZTargetCodeGenInfo::isVectorTypeBased(const Type *Ty, + bool IsParam) const { + if (!SeenTypes.insert(Ty).second) + return false; + + if (IsParam) { + // A narrow (<16 bytes) vector will as a parameter also expose the ABI as + // it will be passed in a vector register. A wide (>16 bytes) vector will + // be passed via "hidden" pointer where any extra alignment is not + // required (per GCC). + const Type *SingleEltTy = getABIInfo() + .GetSingleElementType(QualType(Ty, 0)) + .getTypePtr(); + bool SingleVecEltStruct = SingleEltTy != Ty && SingleEltTy->isVectorType() && + Ctx.getTypeSize(SingleEltTy) == Ctx.getTypeSize(Ty); + if (Ty->isVectorType() || SingleVecEltStruct) + return Ctx.getTypeSize(Ty) / 8 <= 16; + } + + // Assume pointers are dereferenced. + while (Ty->isPointerType() || Ty->isArrayType()) + Ty = Ty->getPointeeOrArrayElementType(); + + // Vectors >= 16 bytes expose the ABI through alignment requirements. + if (Ty->isVectorType() && Ctx.getTypeSize(Ty) / 8 >= 16) + return true; + + if (const auto *RecordTy = Ty->getAs()) { + const RecordDecl *RD = RecordTy->getDecl(); + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) + if (CXXRD->hasDefinition()) + for (const auto &I : CXXRD->bases()) + if (isVectorTypeBased(I.getType().getTypePtr(), /*IsParam*/false)) + return true; + for (const auto *FD : RD->fields()) + if (isVectorTypeBased(FD->getType().getTypePtr(), /*IsParam*/false)) + return true; + } + + if (const auto *FT = Ty->getAs()) + if (isVectorTypeBased(FT->getReturnType().getTypePtr(), /*IsParam*/true)) + return true; + if (const FunctionProtoType *Proto = Ty->getAs()) + for (const auto &ParamType : Proto->getParamTypes()) + if (isVectorTypeBased(ParamType.getTypePtr(), /*IsParam*/true)) + return true; + + return false; +} + +std::unique_ptr +CodeGen::createSystemZTargetCodeGenInfo(CodeGenModule &CGM, bool HasVector, + bool SoftFloatABI) { + return std::make_unique(CGM.getTypes(), HasVector, + SoftFloatABI); +} diff --git a/clang/lib/CodeGen/Targets/TCE.cpp b/clang/lib/CodeGen/Targets/TCE.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/TCE.cpp @@ -0,0 +1,82 @@ +//===- TCE.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// TCE ABI Implementation (see http://tce.cs.tut.fi). Uses mostly the defaults. +// Currently subclassed only to implement custom OpenCL C function attribute +// handling. +//===----------------------------------------------------------------------===// + +namespace { + +class TCETargetCodeGenInfo : public TargetCodeGenInfo { +public: + TCETargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &M) const override; +}; + +void TCETargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { + if (GV->isDeclaration()) + return; + const FunctionDecl *FD = dyn_cast_or_null(D); + if (!FD) return; + + llvm::Function *F = cast(GV); + + if (M.getLangOpts().OpenCL) { + if (FD->hasAttr()) { + // OpenCL C Kernel functions are not subject to inlining + F->addFnAttr(llvm::Attribute::NoInline); + const ReqdWorkGroupSizeAttr *Attr = FD->getAttr(); + if (Attr) { + // Convert the reqd_work_group_size() attributes to metadata. + llvm::LLVMContext &Context = F->getContext(); + llvm::NamedMDNode *OpenCLMetadata = + M.getModule().getOrInsertNamedMetadata( + "opencl.kernel_wg_size_info"); + + SmallVector Operands; + Operands.push_back(llvm::ConstantAsMetadata::get(F)); + + Operands.push_back( + llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue( + M.Int32Ty, llvm::APInt(32, Attr->getXDim())))); + Operands.push_back( + llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue( + M.Int32Ty, llvm::APInt(32, Attr->getYDim())))); + Operands.push_back( + llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue( + M.Int32Ty, llvm::APInt(32, Attr->getZDim())))); + + // Add a boolean constant operand for "required" (true) or "hint" + // (false) for implementing the work_group_size_hint attr later. + // Currently always true as the hint is not yet implemented. + Operands.push_back( + llvm::ConstantAsMetadata::get(llvm::ConstantInt::getTrue(Context))); + OpenCLMetadata->addOperand(llvm::MDNode::get(Context, Operands)); + } + } + } +} + +} + +std::unique_ptr +CodeGen::createTCETargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/VE.cpp b/clang/lib/CodeGen/Targets/VE.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/VE.cpp @@ -0,0 +1,71 @@ +//===- VE.cpp -------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// VE ABI Implementation. +// +namespace { +class VEABIInfo : public DefaultABIInfo { +public: + VEABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + +private: + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType RetTy) const; + void computeInfo(CGFunctionInfo &FI) const override; +}; +} // end anonymous namespace + +ABIArgInfo VEABIInfo::classifyReturnType(QualType Ty) const { + if (Ty->isAnyComplexType()) + return ABIArgInfo::getDirect(); + uint64_t Size = getContext().getTypeSize(Ty); + if (Size < 64 && Ty->isIntegerType()) + return ABIArgInfo::getExtend(Ty); + return DefaultABIInfo::classifyReturnType(Ty); +} + +ABIArgInfo VEABIInfo::classifyArgumentType(QualType Ty) const { + if (Ty->isAnyComplexType()) + return ABIArgInfo::getDirect(); + uint64_t Size = getContext().getTypeSize(Ty); + if (Size < 64 && Ty->isIntegerType()) + return ABIArgInfo::getExtend(Ty); + return DefaultABIInfo::classifyArgumentType(Ty); +} + +void VEABIInfo::computeInfo(CGFunctionInfo &FI) const { + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &Arg : FI.arguments()) + Arg.info = classifyArgumentType(Arg.type); +} + +namespace { +class VETargetCodeGenInfo : public TargetCodeGenInfo { +public: + VETargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + // VE ABI requires the arguments of variadic and prototype-less functions + // are passed in both registers and memory. + bool isNoProtoCallVariadic(const CallArgList &args, + const FunctionNoProtoType *fnType) const override { + return true; + } +}; +} // end anonymous namespace + +std::unique_ptr +CodeGen::createVETargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/lib/CodeGen/Targets/WebAssembly.cpp b/clang/lib/CodeGen/Targets/WebAssembly.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/WebAssembly.cpp @@ -0,0 +1,173 @@ +//===- WebAssembly.cpp ----------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// WebAssembly ABI Implementation +// +// This is a very simple ABI that relies a lot on DefaultABIInfo. +//===----------------------------------------------------------------------===// + +class WebAssemblyABIInfo final : public ABIInfo { + DefaultABIInfo defaultInfo; + WebAssemblyABIKind Kind; + +public: + explicit WebAssemblyABIInfo(CodeGen::CodeGenTypes &CGT, + WebAssemblyABIKind Kind) + : ABIInfo(CGT), defaultInfo(CGT), Kind(Kind) {} + +private: + ABIArgInfo classifyReturnType(QualType RetTy) const; + ABIArgInfo classifyArgumentType(QualType Ty) const; + + // DefaultABIInfo's classifyReturnType and classifyArgumentType are + // non-virtual, but computeInfo and EmitVAArg are virtual, so we + // overload them. + void computeInfo(CGFunctionInfo &FI) const override { + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + for (auto &Arg : FI.arguments()) + Arg.info = classifyArgumentType(Arg.type); + } + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +class WebAssemblyTargetCodeGenInfo final : public TargetCodeGenInfo { +public: + explicit WebAssemblyTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, + WebAssemblyABIKind K) + : TargetCodeGenInfo(std::make_unique(CGT, K)) { + SwiftInfo = + std::make_unique(CGT, /*SwiftErrorInRegister=*/false); + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); + if (const auto *FD = dyn_cast_or_null(D)) { + if (const auto *Attr = FD->getAttr()) { + llvm::Function *Fn = cast(GV); + llvm::AttrBuilder B(GV->getContext()); + B.addAttribute("wasm-import-module", Attr->getImportModule()); + Fn->addFnAttrs(B); + } + if (const auto *Attr = FD->getAttr()) { + llvm::Function *Fn = cast(GV); + llvm::AttrBuilder B(GV->getContext()); + B.addAttribute("wasm-import-name", Attr->getImportName()); + Fn->addFnAttrs(B); + } + if (const auto *Attr = FD->getAttr()) { + llvm::Function *Fn = cast(GV); + llvm::AttrBuilder B(GV->getContext()); + B.addAttribute("wasm-export-name", Attr->getExportName()); + Fn->addFnAttrs(B); + } + } + + if (auto *FD = dyn_cast_or_null(D)) { + llvm::Function *Fn = cast(GV); + if (!FD->doesThisDeclarationHaveABody() && !FD->hasPrototype()) + Fn->addFnAttr("no-prototype"); + } + } + + /// Return the WebAssembly externref reference type. + virtual llvm::Type *getWasmExternrefReferenceType() const override { + return llvm::Type::getWasm_ExternrefTy(getABIInfo().getVMContext()); + } + /// Return the WebAssembly funcref reference type. + virtual llvm::Type *getWasmFuncrefReferenceType() const override { + return llvm::Type::getWasm_FuncrefTy(getABIInfo().getVMContext()); + } +}; + +/// Classify argument of given type \p Ty. +ABIArgInfo WebAssemblyABIInfo::classifyArgumentType(QualType Ty) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + if (isAggregateTypeForABI(Ty)) { + // Records with non-trivial destructors/copy-constructors should not be + // passed by value. + if (auto RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + // Lower single-element structs to just pass a regular value. TODO: We + // could do reasonable-size multiple-element structs too, using getExpand(), + // though watch out for things like bitfields. + if (const Type *SeltTy = isSingleElementStruct(Ty, getContext())) + return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); + // For the experimental multivalue ABI, fully expand all other aggregates + if (Kind == WebAssemblyABIKind::ExperimentalMV) { + const RecordType *RT = Ty->getAs(); + assert(RT); + bool HasBitField = false; + for (auto *Field : RT->getDecl()->fields()) { + if (Field->isBitField()) { + HasBitField = true; + break; + } + } + if (!HasBitField) + return ABIArgInfo::getExpand(); + } + } + + // Otherwise just do the default thing. + return defaultInfo.classifyArgumentType(Ty); +} + +ABIArgInfo WebAssemblyABIInfo::classifyReturnType(QualType RetTy) const { + if (isAggregateTypeForABI(RetTy)) { + // Records with non-trivial destructors/copy-constructors should not be + // returned by value. + if (!getRecordArgABI(RetTy, getCXXABI())) { + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), RetTy, true)) + return ABIArgInfo::getIgnore(); + // Lower single-element structs to just return a regular value. TODO: We + // could do reasonable-size multiple-element structs too, using + // ABIArgInfo::getDirect(). + if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext())) + return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); + // For the experimental multivalue ABI, return all other aggregates + if (Kind == WebAssemblyABIKind::ExperimentalMV) + return ABIArgInfo::getDirect(); + } + } + + // Otherwise just do the default thing. + return defaultInfo.classifyReturnType(RetTy); +} + +Address WebAssemblyABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + bool IsIndirect = isAggregateTypeForABI(Ty) && + !isEmptyRecord(getContext(), Ty, true) && + !isSingleElementStruct(Ty, getContext()); + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, + getContext().getTypeInfoInChars(Ty), + CharUnits::fromQuantity(4), + /*AllowHigherAlign=*/true); +} + +std::unique_ptr +CodeGen::createWebAssemblyTargetCodeGenInfo(CodeGenModule &CGM, + WebAssemblyABIKind K) { + return std::make_unique(CGM.getTypes(), K); +} diff --git a/clang/lib/CodeGen/Targets/X86.cpp b/clang/lib/CodeGen/Targets/X86.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/X86.cpp @@ -0,0 +1,3405 @@ +//===- X86.cpp ------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" +#include "clang/Basic/DiagnosticFrontend.h" +#include "llvm/ADT/SmallBitVector.h" + +using namespace clang; +using namespace clang::CodeGen; + +namespace { + +/// IsX86_MMXType - Return true if this is an MMX type. +bool IsX86_MMXType(llvm::Type *IRType) { + // Return true if the type is an MMX type <2 x i32>, <4 x i16>, or <8 x i8>. + return IRType->isVectorTy() && IRType->getPrimitiveSizeInBits() == 64 && + cast(IRType)->getElementType()->isIntegerTy() && + IRType->getScalarSizeInBits() != 64; +} + +static llvm::Type* X86AdjustInlineAsmType(CodeGen::CodeGenFunction &CGF, + StringRef Constraint, + llvm::Type* Ty) { + bool IsMMXCons = llvm::StringSwitch(Constraint) + .Cases("y", "&y", "^Ym", true) + .Default(false); + if (IsMMXCons && Ty->isVectorTy()) { + if (cast(Ty)->getPrimitiveSizeInBits().getFixedValue() != + 64) { + // Invalid MMX constraint + return nullptr; + } + + return llvm::Type::getX86_MMXTy(CGF.getLLVMContext()); + } + + // No operation needed + return Ty; +} + +/// Returns true if this type can be passed in SSE registers with the +/// X86_VectorCall calling convention. Shared between x86_32 and x86_64. +static bool isX86VectorTypeForVectorCall(ASTContext &Context, QualType Ty) { + if (const BuiltinType *BT = Ty->getAs()) { + if (BT->isFloatingPoint() && BT->getKind() != BuiltinType::Half) { + if (BT->getKind() == BuiltinType::LongDouble) { + if (&Context.getTargetInfo().getLongDoubleFormat() == + &llvm::APFloat::x87DoubleExtended()) + return false; + } + return true; + } + } else if (const VectorType *VT = Ty->getAs()) { + // vectorcall can pass XMM, YMM, and ZMM vectors. We don't pass SSE1 MMX + // registers specially. + unsigned VecSize = Context.getTypeSize(VT); + if (VecSize == 128 || VecSize == 256 || VecSize == 512) + return true; + } + return false; +} + +/// Returns true if this aggregate is small enough to be passed in SSE registers +/// in the X86_VectorCall calling convention. Shared between x86_32 and x86_64. +static bool isX86VectorCallAggregateSmallEnough(uint64_t NumMembers) { + return NumMembers <= 4; +} + +/// Returns a Homogeneous Vector Aggregate ABIArgInfo, used in X86. +static ABIArgInfo getDirectX86Hva(llvm::Type* T = nullptr) { + auto AI = ABIArgInfo::getDirect(T); + AI.setInReg(true); + AI.setCanBeFlattened(false); + return AI; +} + +//===----------------------------------------------------------------------===// +// X86-32 ABI Implementation +//===----------------------------------------------------------------------===// + +/// Similar to llvm::CCState, but for Clang. +struct CCState { + CCState(CGFunctionInfo &FI) + : IsPreassigned(FI.arg_size()), CC(FI.getCallingConvention()) {} + + llvm::SmallBitVector IsPreassigned; + unsigned CC = CallingConv::CC_C; + unsigned FreeRegs = 0; + unsigned FreeSSERegs = 0; +}; + +/// X86_32ABIInfo - The X86-32 ABI information. +class X86_32ABIInfo : public ABIInfo { + enum Class { + Integer, + Float + }; + + static const unsigned MinABIStackAlignInBytes = 4; + + bool IsDarwinVectorABI; + bool IsRetSmallStructInRegABI; + bool IsWin32StructABI; + bool IsSoftFloatABI; + bool IsMCUABI; + bool IsLinuxABI; + unsigned DefaultNumRegisterParameters; + + static bool isRegisterSize(unsigned Size) { + return (Size == 8 || Size == 16 || Size == 32 || Size == 64); + } + + bool isHomogeneousAggregateBaseType(QualType Ty) const override { + // FIXME: Assumes vectorcall is in use. + return isX86VectorTypeForVectorCall(getContext(), Ty); + } + + bool isHomogeneousAggregateSmallEnough(const Type *Ty, + uint64_t NumMembers) const override { + // FIXME: Assumes vectorcall is in use. + return isX86VectorCallAggregateSmallEnough(NumMembers); + } + + bool shouldReturnTypeInRegister(QualType Ty, ASTContext &Context) const; + + /// getIndirectResult - Give a source type \arg Ty, return a suitable result + /// such that the argument will be passed in memory. + ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const; + + ABIArgInfo getIndirectReturnResult(QualType Ty, CCState &State) const; + + /// Return the alignment to use for the given type on the stack. + unsigned getTypeStackAlignInBytes(QualType Ty, unsigned Align) const; + + Class classify(QualType Ty) const; + ABIArgInfo classifyReturnType(QualType RetTy, CCState &State) const; + ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const; + + /// Updates the number of available free registers, returns + /// true if any registers were allocated. + bool updateFreeRegs(QualType Ty, CCState &State) const; + + bool shouldAggregateUseDirect(QualType Ty, CCState &State, bool &InReg, + bool &NeedsPadding) const; + bool shouldPrimitiveUseInReg(QualType Ty, CCState &State) const; + + bool canExpandIndirectArgument(QualType Ty) const; + + /// Rewrite the function info so that all memory arguments use + /// inalloca. + void rewriteWithInAlloca(CGFunctionInfo &FI) const; + + void addFieldToArgStruct(SmallVector &FrameFields, + CharUnits &StackOffset, ABIArgInfo &Info, + QualType Type) const; + void runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const; + +public: + + void computeInfo(CGFunctionInfo &FI) const override; + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + X86_32ABIInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI, + bool RetSmallStructInRegABI, bool Win32StructABI, + unsigned NumRegisterParameters, bool SoftFloatABI) + : ABIInfo(CGT), IsDarwinVectorABI(DarwinVectorABI), + IsRetSmallStructInRegABI(RetSmallStructInRegABI), + IsWin32StructABI(Win32StructABI), IsSoftFloatABI(SoftFloatABI), + IsMCUABI(CGT.getTarget().getTriple().isOSIAMCU()), + IsLinuxABI(CGT.getTarget().getTriple().isOSLinux() || + CGT.getTarget().getTriple().isOSCygMing()), + DefaultNumRegisterParameters(NumRegisterParameters) {} +}; + +class X86_32SwiftABIInfo : public SwiftABIInfo { +public: + explicit X86_32SwiftABIInfo(CodeGenTypes &CGT) + : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/false) {} + + bool shouldPassIndirectly(ArrayRef ComponentTys, + bool AsReturnValue) const override { + // LLVM's x86-32 lowering currently only assigns up to three + // integer registers and three fp registers. Oddly, it'll use up to + // four vector registers for vectors, but those can overlap with the + // scalar registers. + return occupiesMoreThan(ComponentTys, /*total=*/3); + } +}; + +class X86_32TargetCodeGenInfo : public TargetCodeGenInfo { +public: + X86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI, + bool RetSmallStructInRegABI, bool Win32StructABI, + unsigned NumRegisterParameters, bool SoftFloatABI) + : TargetCodeGenInfo(std::make_unique( + CGT, DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI, + NumRegisterParameters, SoftFloatABI)) { + SwiftInfo = std::make_unique(CGT); + } + + static bool isStructReturnInRegABI( + const llvm::Triple &Triple, const CodeGenOptions &Opts); + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override; + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { + // Darwin uses different dwarf register numbers for EH. + if (CGM.getTarget().getTriple().isOSDarwin()) return 5; + return 4; + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override; + + llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF, + StringRef Constraint, + llvm::Type* Ty) const override { + return X86AdjustInlineAsmType(CGF, Constraint, Ty); + } + + void addReturnRegisterOutputs(CodeGenFunction &CGF, LValue ReturnValue, + std::string &Constraints, + std::vector &ResultRegTypes, + std::vector &ResultTruncRegTypes, + std::vector &ResultRegDests, + std::string &AsmString, + unsigned NumOutputs) const override; + + StringRef getARCRetainAutoreleasedReturnValueMarker() const override { + return "movl\t%ebp, %ebp" + "\t\t// marker for objc_retainAutoreleaseReturnValue"; + } +}; + +} + +/// Rewrite input constraint references after adding some output constraints. +/// In the case where there is one output and one input and we add one output, +/// we need to replace all operand references greater than or equal to 1: +/// mov $0, $1 +/// mov eax, $1 +/// The result will be: +/// mov $0, $2 +/// mov eax, $2 +static void rewriteInputConstraintReferences(unsigned FirstIn, + unsigned NumNewOuts, + std::string &AsmString) { + std::string Buf; + llvm::raw_string_ostream OS(Buf); + size_t Pos = 0; + while (Pos < AsmString.size()) { + size_t DollarStart = AsmString.find('$', Pos); + if (DollarStart == std::string::npos) + DollarStart = AsmString.size(); + size_t DollarEnd = AsmString.find_first_not_of('$', DollarStart); + if (DollarEnd == std::string::npos) + DollarEnd = AsmString.size(); + OS << StringRef(&AsmString[Pos], DollarEnd - Pos); + Pos = DollarEnd; + size_t NumDollars = DollarEnd - DollarStart; + if (NumDollars % 2 != 0 && Pos < AsmString.size()) { + // We have an operand reference. + size_t DigitStart = Pos; + if (AsmString[DigitStart] == '{') { + OS << '{'; + ++DigitStart; + } + size_t DigitEnd = AsmString.find_first_not_of("0123456789", DigitStart); + if (DigitEnd == std::string::npos) + DigitEnd = AsmString.size(); + StringRef OperandStr(&AsmString[DigitStart], DigitEnd - DigitStart); + unsigned OperandIndex; + if (!OperandStr.getAsInteger(10, OperandIndex)) { + if (OperandIndex >= FirstIn) + OperandIndex += NumNewOuts; + OS << OperandIndex; + } else { + OS << OperandStr; + } + Pos = DigitEnd; + } + } + AsmString = std::move(OS.str()); +} + +/// Add output constraints for EAX:EDX because they are return registers. +void X86_32TargetCodeGenInfo::addReturnRegisterOutputs( + CodeGenFunction &CGF, LValue ReturnSlot, std::string &Constraints, + std::vector &ResultRegTypes, + std::vector &ResultTruncRegTypes, + std::vector &ResultRegDests, std::string &AsmString, + unsigned NumOutputs) const { + uint64_t RetWidth = CGF.getContext().getTypeSize(ReturnSlot.getType()); + + // Use the EAX constraint if the width is 32 or smaller and EAX:EDX if it is + // larger. + if (!Constraints.empty()) + Constraints += ','; + if (RetWidth <= 32) { + Constraints += "={eax}"; + ResultRegTypes.push_back(CGF.Int32Ty); + } else { + // Use the 'A' constraint for EAX:EDX. + Constraints += "=A"; + ResultRegTypes.push_back(CGF.Int64Ty); + } + + // Truncate EAX or EAX:EDX to an integer of the appropriate size. + llvm::Type *CoerceTy = llvm::IntegerType::get(CGF.getLLVMContext(), RetWidth); + ResultTruncRegTypes.push_back(CoerceTy); + + // Coerce the integer by bitcasting the return slot pointer. + ReturnSlot.setAddress( + CGF.Builder.CreateElementBitCast(ReturnSlot.getAddress(CGF), CoerceTy)); + ResultRegDests.push_back(ReturnSlot); + + rewriteInputConstraintReferences(NumOutputs, 1, AsmString); +} + +/// shouldReturnTypeInRegister - Determine if the given type should be +/// returned in a register (for the Darwin and MCU ABI). +bool X86_32ABIInfo::shouldReturnTypeInRegister(QualType Ty, + ASTContext &Context) const { + uint64_t Size = Context.getTypeSize(Ty); + + // For i386, type must be register sized. + // For the MCU ABI, it only needs to be <= 8-byte + if ((IsMCUABI && Size > 64) || (!IsMCUABI && !isRegisterSize(Size))) + return false; + + if (Ty->isVectorType()) { + // 64- and 128- bit vectors inside structures are not returned in + // registers. + if (Size == 64 || Size == 128) + return false; + + return true; + } + + // If this is a builtin, pointer, enum, complex type, member pointer, or + // member function pointer it is ok. + if (Ty->getAs() || Ty->hasPointerRepresentation() || + Ty->isAnyComplexType() || Ty->isEnumeralType() || + Ty->isBlockPointerType() || Ty->isMemberPointerType()) + return true; + + // Arrays are treated like records. + if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) + return shouldReturnTypeInRegister(AT->getElementType(), Context); + + // Otherwise, it must be a record type. + const RecordType *RT = Ty->getAs(); + if (!RT) return false; + + // FIXME: Traverse bases here too. + + // Structure types are passed in register if all fields would be + // passed in a register. + for (const auto *FD : RT->getDecl()->fields()) { + // Empty fields are ignored. + if (isEmptyField(Context, FD, true)) + continue; + + // Check fields recursively. + if (!shouldReturnTypeInRegister(FD->getType(), Context)) + return false; + } + return true; +} + +static bool is32Or64BitBasicType(QualType Ty, ASTContext &Context) { + // Treat complex types as the element type. + if (const ComplexType *CTy = Ty->getAs()) + Ty = CTy->getElementType(); + + // Check for a type which we know has a simple scalar argument-passing + // convention without any padding. (We're specifically looking for 32 + // and 64-bit integer and integer-equivalents, float, and double.) + if (!Ty->getAs() && !Ty->hasPointerRepresentation() && + !Ty->isEnumeralType() && !Ty->isBlockPointerType()) + return false; + + uint64_t Size = Context.getTypeSize(Ty); + return Size == 32 || Size == 64; +} + +static bool addFieldSizes(ASTContext &Context, const RecordDecl *RD, + uint64_t &Size) { + for (const auto *FD : RD->fields()) { + // Scalar arguments on the stack get 4 byte alignment on x86. If the + // argument is smaller than 32-bits, expanding the struct will create + // alignment padding. + if (!is32Or64BitBasicType(FD->getType(), Context)) + return false; + + // FIXME: Reject bit-fields wholesale; there are two problems, we don't know + // how to expand them yet, and the predicate for telling if a bitfield still + // counts as "basic" is more complicated than what we were doing previously. + if (FD->isBitField()) + return false; + + Size += Context.getTypeSize(FD->getType()); + } + return true; +} + +static bool addBaseAndFieldSizes(ASTContext &Context, const CXXRecordDecl *RD, + uint64_t &Size) { + // Don't do this if there are any non-empty bases. + for (const CXXBaseSpecifier &Base : RD->bases()) { + if (!addBaseAndFieldSizes(Context, Base.getType()->getAsCXXRecordDecl(), + Size)) + return false; + } + if (!addFieldSizes(Context, RD, Size)) + return false; + return true; +} + +/// Test whether an argument type which is to be passed indirectly (on the +/// stack) would have the equivalent layout if it was expanded into separate +/// arguments. If so, we prefer to do the latter to avoid inhibiting +/// optimizations. +bool X86_32ABIInfo::canExpandIndirectArgument(QualType Ty) const { + // We can only expand structure types. + const RecordType *RT = Ty->getAs(); + if (!RT) + return false; + const RecordDecl *RD = RT->getDecl(); + uint64_t Size = 0; + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + if (!IsWin32StructABI) { + // On non-Windows, we have to conservatively match our old bitcode + // prototypes in order to be ABI-compatible at the bitcode level. + if (!CXXRD->isCLike()) + return false; + } else { + // Don't do this for dynamic classes. + if (CXXRD->isDynamicClass()) + return false; + } + if (!addBaseAndFieldSizes(getContext(), CXXRD, Size)) + return false; + } else { + if (!addFieldSizes(getContext(), RD, Size)) + return false; + } + + // We can do this if there was no alignment padding. + return Size == getContext().getTypeSize(Ty); +} + +ABIArgInfo X86_32ABIInfo::getIndirectReturnResult(QualType RetTy, CCState &State) const { + // If the return value is indirect, then the hidden argument is consuming one + // integer register. + if (State.FreeRegs) { + --State.FreeRegs; + if (!IsMCUABI) + return getNaturalAlignIndirectInReg(RetTy); + } + return getNaturalAlignIndirect(RetTy, /*ByVal=*/false); +} + +ABIArgInfo X86_32ABIInfo::classifyReturnType(QualType RetTy, + CCState &State) const { + if (RetTy->isVoidType()) + return ABIArgInfo::getIgnore(); + + const Type *Base = nullptr; + uint64_t NumElts = 0; + if ((State.CC == llvm::CallingConv::X86_VectorCall || + State.CC == llvm::CallingConv::X86_RegCall) && + isHomogeneousAggregate(RetTy, Base, NumElts)) { + // The LLVM struct type for such an aggregate should lower properly. + return ABIArgInfo::getDirect(); + } + + if (const VectorType *VT = RetTy->getAs()) { + // On Darwin, some vectors are returned in registers. + if (IsDarwinVectorABI) { + uint64_t Size = getContext().getTypeSize(RetTy); + + // 128-bit vectors are a special case; they are returned in + // registers and we need to make sure to pick a type the LLVM + // backend will like. + if (Size == 128) + return ABIArgInfo::getDirect(llvm::FixedVectorType::get( + llvm::Type::getInt64Ty(getVMContext()), 2)); + + // Always return in register if it fits in a general purpose + // register, or if it is 64 bits and has a single element. + if ((Size == 8 || Size == 16 || Size == 32) || + (Size == 64 && VT->getNumElements() == 1)) + return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), + Size)); + + return getIndirectReturnResult(RetTy, State); + } + + return ABIArgInfo::getDirect(); + } + + if (isAggregateTypeForABI(RetTy)) { + if (const RecordType *RT = RetTy->getAs()) { + // Structures with flexible arrays are always indirect. + if (RT->getDecl()->hasFlexibleArrayMember()) + return getIndirectReturnResult(RetTy, State); + } + + // If specified, structs and unions are always indirect. + if (!IsRetSmallStructInRegABI && !RetTy->isAnyComplexType()) + return getIndirectReturnResult(RetTy, State); + + // Ignore empty structs/unions. + if (isEmptyRecord(getContext(), RetTy, true)) + return ABIArgInfo::getIgnore(); + + // Return complex of _Float16 as <2 x half> so the backend will use xmm0. + if (const ComplexType *CT = RetTy->getAs()) { + QualType ET = getContext().getCanonicalType(CT->getElementType()); + if (ET->isFloat16Type()) + return ABIArgInfo::getDirect(llvm::FixedVectorType::get( + llvm::Type::getHalfTy(getVMContext()), 2)); + } + + // Small structures which are register sized are generally returned + // in a register. + if (shouldReturnTypeInRegister(RetTy, getContext())) { + uint64_t Size = getContext().getTypeSize(RetTy); + + // As a special-case, if the struct is a "single-element" struct, and + // the field is of type "float" or "double", return it in a + // floating-point register. (MSVC does not apply this special case.) + // We apply a similar transformation for pointer types to improve the + // quality of the generated IR. + if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext())) + if ((!IsWin32StructABI && SeltTy->isRealFloatingType()) + || SeltTy->hasPointerRepresentation()) + return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0))); + + // FIXME: We should be able to narrow this integer in cases with dead + // padding. + return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),Size)); + } + + return getIndirectReturnResult(RetTy, State); + } + + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + if (const auto *EIT = RetTy->getAs()) + if (EIT->getNumBits() > 64) + return getIndirectReturnResult(RetTy, State); + + return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy) + : ABIArgInfo::getDirect()); +} + +unsigned X86_32ABIInfo::getTypeStackAlignInBytes(QualType Ty, + unsigned Align) const { + // Otherwise, if the alignment is less than or equal to the minimum ABI + // alignment, just use the default; the backend will handle this. + if (Align <= MinABIStackAlignInBytes) + return 0; // Use default alignment. + + if (IsLinuxABI) { + // Exclude other System V OS (e.g Darwin, PS4 and FreeBSD) since we don't + // want to spend any effort dealing with the ramifications of ABI breaks. + // + // If the vector type is __m128/__m256/__m512, return the default alignment. + if (Ty->isVectorType() && (Align == 16 || Align == 32 || Align == 64)) + return Align; + } + // On non-Darwin, the stack type alignment is always 4. + if (!IsDarwinVectorABI) { + // Set explicit alignment, since we may need to realign the top. + return MinABIStackAlignInBytes; + } + + // Otherwise, if the type contains an SSE vector type, the alignment is 16. + if (Align >= 16 && (isSIMDVectorType(getContext(), Ty) || + isRecordWithSIMDVectorType(getContext(), Ty))) + return 16; + + return MinABIStackAlignInBytes; +} + +ABIArgInfo X86_32ABIInfo::getIndirectResult(QualType Ty, bool ByVal, + CCState &State) const { + if (!ByVal) { + if (State.FreeRegs) { + --State.FreeRegs; // Non-byval indirects just use one pointer. + if (!IsMCUABI) + return getNaturalAlignIndirectInReg(Ty); + } + return getNaturalAlignIndirect(Ty, false); + } + + // Compute the byval alignment. + unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8; + unsigned StackAlign = getTypeStackAlignInBytes(Ty, TypeAlign); + if (StackAlign == 0) + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true); + + // If the stack alignment is less than the type alignment, realign the + // argument. + bool Realign = TypeAlign > StackAlign; + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(StackAlign), + /*ByVal=*/true, Realign); +} + +X86_32ABIInfo::Class X86_32ABIInfo::classify(QualType Ty) const { + const Type *T = isSingleElementStruct(Ty, getContext()); + if (!T) + T = Ty.getTypePtr(); + + if (const BuiltinType *BT = T->getAs()) { + BuiltinType::Kind K = BT->getKind(); + if (K == BuiltinType::Float || K == BuiltinType::Double) + return Float; + } + return Integer; +} + +bool X86_32ABIInfo::updateFreeRegs(QualType Ty, CCState &State) const { + if (!IsSoftFloatABI) { + Class C = classify(Ty); + if (C == Float) + return false; + } + + unsigned Size = getContext().getTypeSize(Ty); + unsigned SizeInRegs = (Size + 31) / 32; + + if (SizeInRegs == 0) + return false; + + if (!IsMCUABI) { + if (SizeInRegs > State.FreeRegs) { + State.FreeRegs = 0; + return false; + } + } else { + // The MCU psABI allows passing parameters in-reg even if there are + // earlier parameters that are passed on the stack. Also, + // it does not allow passing >8-byte structs in-register, + // even if there are 3 free registers available. + if (SizeInRegs > State.FreeRegs || SizeInRegs > 2) + return false; + } + + State.FreeRegs -= SizeInRegs; + return true; +} + +bool X86_32ABIInfo::shouldAggregateUseDirect(QualType Ty, CCState &State, + bool &InReg, + bool &NeedsPadding) const { + // On Windows, aggregates other than HFAs are never passed in registers, and + // they do not consume register slots. Homogenous floating-point aggregates + // (HFAs) have already been dealt with at this point. + if (IsWin32StructABI && isAggregateTypeForABI(Ty)) + return false; + + NeedsPadding = false; + InReg = !IsMCUABI; + + if (!updateFreeRegs(Ty, State)) + return false; + + if (IsMCUABI) + return true; + + if (State.CC == llvm::CallingConv::X86_FastCall || + State.CC == llvm::CallingConv::X86_VectorCall || + State.CC == llvm::CallingConv::X86_RegCall) { + if (getContext().getTypeSize(Ty) <= 32 && State.FreeRegs) + NeedsPadding = true; + + return false; + } + + return true; +} + +bool X86_32ABIInfo::shouldPrimitiveUseInReg(QualType Ty, CCState &State) const { + bool IsPtrOrInt = (getContext().getTypeSize(Ty) <= 32) && + (Ty->isIntegralOrEnumerationType() || Ty->isPointerType() || + Ty->isReferenceType()); + + if (!IsPtrOrInt && (State.CC == llvm::CallingConv::X86_FastCall || + State.CC == llvm::CallingConv::X86_VectorCall)) + return false; + + if (!updateFreeRegs(Ty, State)) + return false; + + if (!IsPtrOrInt && State.CC == llvm::CallingConv::X86_RegCall) + return false; + + // Return true to apply inreg to all legal parameters except for MCU targets. + return !IsMCUABI; +} + +void X86_32ABIInfo::runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const { + // Vectorcall x86 works subtly different than in x64, so the format is + // a bit different than the x64 version. First, all vector types (not HVAs) + // are assigned, with the first 6 ending up in the [XYZ]MM0-5 registers. + // This differs from the x64 implementation, where the first 6 by INDEX get + // registers. + // In the second pass over the arguments, HVAs are passed in the remaining + // vector registers if possible, or indirectly by address. The address will be + // passed in ECX/EDX if available. Any other arguments are passed according to + // the usual fastcall rules. + MutableArrayRef Args = FI.arguments(); + for (int I = 0, E = Args.size(); I < E; ++I) { + const Type *Base = nullptr; + uint64_t NumElts = 0; + const QualType &Ty = Args[I].type; + if ((Ty->isVectorType() || Ty->isBuiltinType()) && + isHomogeneousAggregate(Ty, Base, NumElts)) { + if (State.FreeSSERegs >= NumElts) { + State.FreeSSERegs -= NumElts; + Args[I].info = ABIArgInfo::getDirectInReg(); + State.IsPreassigned.set(I); + } + } + } +} + +ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty, + CCState &State) const { + // FIXME: Set alignment on indirect arguments. + bool IsFastCall = State.CC == llvm::CallingConv::X86_FastCall; + bool IsRegCall = State.CC == llvm::CallingConv::X86_RegCall; + bool IsVectorCall = State.CC == llvm::CallingConv::X86_VectorCall; + + Ty = useFirstFieldIfTransparentUnion(Ty); + TypeInfo TI = getContext().getTypeInfo(Ty); + + // Check with the C++ ABI first. + const RecordType *RT = Ty->getAs(); + if (RT) { + CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()); + if (RAA == CGCXXABI::RAA_Indirect) { + return getIndirectResult(Ty, false, State); + } else if (RAA == CGCXXABI::RAA_DirectInMemory) { + // The field index doesn't matter, we'll fix it up later. + return ABIArgInfo::getInAlloca(/*FieldIndex=*/0); + } + } + + // Regcall uses the concept of a homogenous vector aggregate, similar + // to other targets. + const Type *Base = nullptr; + uint64_t NumElts = 0; + if ((IsRegCall || IsVectorCall) && + isHomogeneousAggregate(Ty, Base, NumElts)) { + if (State.FreeSSERegs >= NumElts) { + State.FreeSSERegs -= NumElts; + + // Vectorcall passes HVAs directly and does not flatten them, but regcall + // does. + if (IsVectorCall) + return getDirectX86Hva(); + + if (Ty->isBuiltinType() || Ty->isVectorType()) + return ABIArgInfo::getDirect(); + return ABIArgInfo::getExpand(); + } + return getIndirectResult(Ty, /*ByVal=*/false, State); + } + + if (isAggregateTypeForABI(Ty)) { + // Structures with flexible arrays are always indirect. + // FIXME: This should not be byval! + if (RT && RT->getDecl()->hasFlexibleArrayMember()) + return getIndirectResult(Ty, true, State); + + // Ignore empty structs/unions on non-Windows. + if (!IsWin32StructABI && isEmptyRecord(getContext(), Ty, true)) + return ABIArgInfo::getIgnore(); + + llvm::LLVMContext &LLVMContext = getVMContext(); + llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext); + bool NeedsPadding = false; + bool InReg; + if (shouldAggregateUseDirect(Ty, State, InReg, NeedsPadding)) { + unsigned SizeInRegs = (TI.Width + 31) / 32; + SmallVector Elements(SizeInRegs, Int32); + llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements); + if (InReg) + return ABIArgInfo::getDirectInReg(Result); + else + return ABIArgInfo::getDirect(Result); + } + llvm::IntegerType *PaddingType = NeedsPadding ? Int32 : nullptr; + + // Pass over-aligned aggregates on Windows indirectly. This behavior was + // added in MSVC 2015. Use the required alignment from the record layout, + // since that may be less than the regular type alignment, and types with + // required alignment of less than 4 bytes are not passed indirectly. + if (IsWin32StructABI) { + unsigned AlignInBits = 0; + if (RT) { + const ASTRecordLayout &Layout = + getContext().getASTRecordLayout(RT->getDecl()); + AlignInBits = getContext().toBits(Layout.getRequiredAlignment()); + } else if (TI.isAlignRequired()) { + AlignInBits = TI.Align; + } + if (AlignInBits > 32) + return getIndirectResult(Ty, /*ByVal=*/false, State); + } + + // Expand small (<= 128-bit) record types when we know that the stack layout + // of those arguments will match the struct. This is important because the + // LLVM backend isn't smart enough to remove byval, which inhibits many + // optimizations. + // Don't do this for the MCU if there are still free integer registers + // (see X86_64 ABI for full explanation). + if (TI.Width <= 4 * 32 && (!IsMCUABI || State.FreeRegs == 0) && + canExpandIndirectArgument(Ty)) + return ABIArgInfo::getExpandWithPadding( + IsFastCall || IsVectorCall || IsRegCall, PaddingType); + + return getIndirectResult(Ty, true, State); + } + + if (const VectorType *VT = Ty->getAs()) { + // On Windows, vectors are passed directly if registers are available, or + // indirectly if not. This avoids the need to align argument memory. Pass + // user-defined vector types larger than 512 bits indirectly for simplicity. + if (IsWin32StructABI) { + if (TI.Width <= 512 && State.FreeSSERegs > 0) { + --State.FreeSSERegs; + return ABIArgInfo::getDirectInReg(); + } + return getIndirectResult(Ty, /*ByVal=*/false, State); + } + + // On Darwin, some vectors are passed in memory, we handle this by passing + // it as an i8/i16/i32/i64. + if (IsDarwinVectorABI) { + if ((TI.Width == 8 || TI.Width == 16 || TI.Width == 32) || + (TI.Width == 64 && VT->getNumElements() == 1)) + return ABIArgInfo::getDirect( + llvm::IntegerType::get(getVMContext(), TI.Width)); + } + + if (IsX86_MMXType(CGT.ConvertType(Ty))) + return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), 64)); + + return ABIArgInfo::getDirect(); + } + + + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + bool InReg = shouldPrimitiveUseInReg(Ty, State); + + if (isPromotableIntegerTypeForABI(Ty)) { + if (InReg) + return ABIArgInfo::getExtendInReg(Ty); + return ABIArgInfo::getExtend(Ty); + } + + if (const auto *EIT = Ty->getAs()) { + if (EIT->getNumBits() <= 64) { + if (InReg) + return ABIArgInfo::getDirectInReg(); + return ABIArgInfo::getDirect(); + } + return getIndirectResult(Ty, /*ByVal=*/false, State); + } + + if (InReg) + return ABIArgInfo::getDirectInReg(); + return ABIArgInfo::getDirect(); +} + +void X86_32ABIInfo::computeInfo(CGFunctionInfo &FI) const { + CCState State(FI); + if (IsMCUABI) + State.FreeRegs = 3; + else if (State.CC == llvm::CallingConv::X86_FastCall) { + State.FreeRegs = 2; + State.FreeSSERegs = 3; + } else if (State.CC == llvm::CallingConv::X86_VectorCall) { + State.FreeRegs = 2; + State.FreeSSERegs = 6; + } else if (FI.getHasRegParm()) + State.FreeRegs = FI.getRegParm(); + else if (State.CC == llvm::CallingConv::X86_RegCall) { + State.FreeRegs = 5; + State.FreeSSERegs = 8; + } else if (IsWin32StructABI) { + // Since MSVC 2015, the first three SSE vectors have been passed in + // registers. The rest are passed indirectly. + State.FreeRegs = DefaultNumRegisterParameters; + State.FreeSSERegs = 3; + } else + State.FreeRegs = DefaultNumRegisterParameters; + + if (!::classifyReturnType(getCXXABI(), FI, *this)) { + FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), State); + } else if (FI.getReturnInfo().isIndirect()) { + // The C++ ABI is not aware of register usage, so we have to check if the + // return value was sret and put it in a register ourselves if appropriate. + if (State.FreeRegs) { + --State.FreeRegs; // The sret parameter consumes a register. + if (!IsMCUABI) + FI.getReturnInfo().setInReg(true); + } + } + + // The chain argument effectively gives us another free register. + if (FI.isChainCall()) + ++State.FreeRegs; + + // For vectorcall, do a first pass over the arguments, assigning FP and vector + // arguments to XMM registers as available. + if (State.CC == llvm::CallingConv::X86_VectorCall) + runVectorCallFirstPass(FI, State); + + bool UsedInAlloca = false; + MutableArrayRef Args = FI.arguments(); + for (int I = 0, E = Args.size(); I < E; ++I) { + // Skip arguments that have already been assigned. + if (State.IsPreassigned.test(I)) + continue; + + Args[I].info = classifyArgumentType(Args[I].type, State); + UsedInAlloca |= (Args[I].info.getKind() == ABIArgInfo::InAlloca); + } + + // If we needed to use inalloca for any argument, do a second pass and rewrite + // all the memory arguments to use inalloca. + if (UsedInAlloca) + rewriteWithInAlloca(FI); +} + +void +X86_32ABIInfo::addFieldToArgStruct(SmallVector &FrameFields, + CharUnits &StackOffset, ABIArgInfo &Info, + QualType Type) const { + // Arguments are always 4-byte-aligned. + CharUnits WordSize = CharUnits::fromQuantity(4); + assert(StackOffset.isMultipleOf(WordSize) && "unaligned inalloca struct"); + + // sret pointers and indirect things will require an extra pointer + // indirection, unless they are byval. Most things are byval, and will not + // require this indirection. + bool IsIndirect = false; + if (Info.isIndirect() && !Info.getIndirectByVal()) + IsIndirect = true; + Info = ABIArgInfo::getInAlloca(FrameFields.size(), IsIndirect); + llvm::Type *LLTy = CGT.ConvertTypeForMem(Type); + if (IsIndirect) + LLTy = llvm::PointerType::getUnqual(getVMContext()); + FrameFields.push_back(LLTy); + StackOffset += IsIndirect ? WordSize : getContext().getTypeSizeInChars(Type); + + // Insert padding bytes to respect alignment. + CharUnits FieldEnd = StackOffset; + StackOffset = FieldEnd.alignTo(WordSize); + if (StackOffset != FieldEnd) { + CharUnits NumBytes = StackOffset - FieldEnd; + llvm::Type *Ty = llvm::Type::getInt8Ty(getVMContext()); + Ty = llvm::ArrayType::get(Ty, NumBytes.getQuantity()); + FrameFields.push_back(Ty); + } +} + +static bool isArgInAlloca(const ABIArgInfo &Info) { + // Leave ignored and inreg arguments alone. + switch (Info.getKind()) { + case ABIArgInfo::InAlloca: + return true; + case ABIArgInfo::Ignore: + case ABIArgInfo::IndirectAliased: + return false; + case ABIArgInfo::Indirect: + case ABIArgInfo::Direct: + case ABIArgInfo::Extend: + return !Info.getInReg(); + case ABIArgInfo::Expand: + case ABIArgInfo::CoerceAndExpand: + // These are aggregate types which are never passed in registers when + // inalloca is involved. + return true; + } + llvm_unreachable("invalid enum"); +} + +void X86_32ABIInfo::rewriteWithInAlloca(CGFunctionInfo &FI) const { + assert(IsWin32StructABI && "inalloca only supported on win32"); + + // Build a packed struct type for all of the arguments in memory. + SmallVector FrameFields; + + // The stack alignment is always 4. + CharUnits StackAlign = CharUnits::fromQuantity(4); + + CharUnits StackOffset; + CGFunctionInfo::arg_iterator I = FI.arg_begin(), E = FI.arg_end(); + + // Put 'this' into the struct before 'sret', if necessary. + bool IsThisCall = + FI.getCallingConvention() == llvm::CallingConv::X86_ThisCall; + ABIArgInfo &Ret = FI.getReturnInfo(); + if (Ret.isIndirect() && Ret.isSRetAfterThis() && !IsThisCall && + isArgInAlloca(I->info)) { + addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type); + ++I; + } + + // Put the sret parameter into the inalloca struct if it's in memory. + if (Ret.isIndirect() && !Ret.getInReg()) { + addFieldToArgStruct(FrameFields, StackOffset, Ret, FI.getReturnType()); + // On Windows, the hidden sret parameter is always returned in eax. + Ret.setInAllocaSRet(IsWin32StructABI); + } + + // Skip the 'this' parameter in ecx. + if (IsThisCall) + ++I; + + // Put arguments passed in memory into the struct. + for (; I != E; ++I) { + if (isArgInAlloca(I->info)) + addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type); + } + + FI.setArgStruct(llvm::StructType::get(getVMContext(), FrameFields, + /*isPacked=*/true), + StackAlign); +} + +Address X86_32ABIInfo::EmitVAArg(CodeGenFunction &CGF, + Address VAListAddr, QualType Ty) const { + + auto TypeInfo = getContext().getTypeInfoInChars(Ty); + + // x86-32 changes the alignment of certain arguments on the stack. + // + // Just messing with TypeInfo like this works because we never pass + // anything indirectly. + TypeInfo.Align = CharUnits::fromQuantity( + getTypeStackAlignInBytes(Ty, TypeInfo.Align.getQuantity())); + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, + TypeInfo, CharUnits::fromQuantity(4), + /*AllowHigherAlign*/ true); +} + +bool X86_32TargetCodeGenInfo::isStructReturnInRegABI( + const llvm::Triple &Triple, const CodeGenOptions &Opts) { + assert(Triple.getArch() == llvm::Triple::x86); + + switch (Opts.getStructReturnConvention()) { + case CodeGenOptions::SRCK_Default: + break; + case CodeGenOptions::SRCK_OnStack: // -fpcc-struct-return + return false; + case CodeGenOptions::SRCK_InRegs: // -freg-struct-return + return true; + } + + if (Triple.isOSDarwin() || Triple.isOSIAMCU()) + return true; + + switch (Triple.getOS()) { + case llvm::Triple::DragonFly: + case llvm::Triple::FreeBSD: + case llvm::Triple::OpenBSD: + case llvm::Triple::Win32: + return true; + default: + return false; + } +} + +static void addX86InterruptAttrs(const FunctionDecl *FD, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) { + if (!FD->hasAttr()) + return; + + llvm::Function *Fn = cast(GV); + Fn->setCallingConv(llvm::CallingConv::X86_INTR); + if (FD->getNumParams() == 0) + return; + + auto PtrTy = cast(FD->getParamDecl(0)->getType()); + llvm::Type *ByValTy = CGM.getTypes().ConvertType(PtrTy->getPointeeType()); + llvm::Attribute NewAttr = llvm::Attribute::getWithByValType( + Fn->getContext(), ByValTy); + Fn->addParamAttr(0, NewAttr); +} + +void X86_32TargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { + if (GV->isDeclaration()) + return; + if (const FunctionDecl *FD = dyn_cast_or_null(D)) { + if (FD->hasAttr()) { + llvm::Function *Fn = cast(GV); + Fn->addFnAttr("stackrealign"); + } + + addX86InterruptAttrs(FD, GV, CGM); + } +} + +bool X86_32TargetCodeGenInfo::initDwarfEHRegSizeTable( + CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const { + CodeGen::CGBuilderTy &Builder = CGF.Builder; + + llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4); + + // 0-7 are the eight integer registers; the order is different + // on Darwin (for EH), but the range is the same. + // 8 is %eip. + AssignToArrayRange(Builder, Address, Four8, 0, 8); + + if (CGF.CGM.getTarget().getTriple().isOSDarwin()) { + // 12-16 are st(0..4). Not sure why we stop at 4. + // These have size 16, which is sizeof(long double) on + // platforms with 8-byte alignment for that type. + llvm::Value *Sixteen8 = llvm::ConstantInt::get(CGF.Int8Ty, 16); + AssignToArrayRange(Builder, Address, Sixteen8, 12, 16); + + } else { + // 9 is %eflags, which doesn't get a size on Darwin for some + // reason. + Builder.CreateAlignedStore( + Four8, Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, Address, 9), + CharUnits::One()); + + // 11-16 are st(0..5). Not sure why we stop at 5. + // These have size 12, which is sizeof(long double) on + // platforms with 4-byte alignment for that type. + llvm::Value *Twelve8 = llvm::ConstantInt::get(CGF.Int8Ty, 12); + AssignToArrayRange(Builder, Address, Twelve8, 11, 16); + } + + return false; +} + +//===----------------------------------------------------------------------===// +// X86-64 ABI Implementation +//===----------------------------------------------------------------------===// + + +namespace { + +/// \p returns the size in bits of the largest (native) vector for \p AVXLevel. +static unsigned getNativeVectorSizeForAVXABI(X86AVXABILevel AVXLevel) { + switch (AVXLevel) { + case X86AVXABILevel::AVX512: + return 512; + case X86AVXABILevel::AVX: + return 256; + case X86AVXABILevel::None: + return 128; + } + llvm_unreachable("Unknown AVXLevel"); +} + +/// X86_64ABIInfo - The X86_64 ABI information. +class X86_64ABIInfo : public ABIInfo { + enum Class { + Integer = 0, + SSE, + SSEUp, + X87, + X87Up, + ComplexX87, + NoClass, + Memory + }; + + /// merge - Implement the X86_64 ABI merging algorithm. + /// + /// Merge an accumulating classification \arg Accum with a field + /// classification \arg Field. + /// + /// \param Accum - The accumulating classification. This should + /// always be either NoClass or the result of a previous merge + /// call. In addition, this should never be Memory (the caller + /// should just return Memory for the aggregate). + static Class merge(Class Accum, Class Field); + + /// postMerge - Implement the X86_64 ABI post merging algorithm. + /// + /// Post merger cleanup, reduces a malformed Hi and Lo pair to + /// final MEMORY or SSE classes when necessary. + /// + /// \param AggregateSize - The size of the current aggregate in + /// the classification process. + /// + /// \param Lo - The classification for the parts of the type + /// residing in the low word of the containing object. + /// + /// \param Hi - The classification for the parts of the type + /// residing in the higher words of the containing object. + /// + void postMerge(unsigned AggregateSize, Class &Lo, Class &Hi) const; + + /// classify - Determine the x86_64 register classes in which the + /// given type T should be passed. + /// + /// \param Lo - The classification for the parts of the type + /// residing in the low word of the containing object. + /// + /// \param Hi - The classification for the parts of the type + /// residing in the high word of the containing object. + /// + /// \param OffsetBase - The bit offset of this type in the + /// containing object. Some parameters are classified different + /// depending on whether they straddle an eightbyte boundary. + /// + /// \param isNamedArg - Whether the argument in question is a "named" + /// argument, as used in AMD64-ABI 3.5.7. + /// + /// \param IsRegCall - Whether the calling conversion is regcall. + /// + /// If a word is unused its result will be NoClass; if a type should + /// be passed in Memory then at least the classification of \arg Lo + /// will be Memory. + /// + /// The \arg Lo class will be NoClass iff the argument is ignored. + /// + /// If the \arg Lo class is ComplexX87, then the \arg Hi class will + /// also be ComplexX87. + void classify(QualType T, uint64_t OffsetBase, Class &Lo, Class &Hi, + bool isNamedArg, bool IsRegCall = false) const; + + llvm::Type *GetByteVectorType(QualType Ty) const; + llvm::Type *GetSSETypeAtOffset(llvm::Type *IRType, + unsigned IROffset, QualType SourceTy, + unsigned SourceOffset) const; + llvm::Type *GetINTEGERTypeAtOffset(llvm::Type *IRType, + unsigned IROffset, QualType SourceTy, + unsigned SourceOffset) const; + + /// getIndirectResult - Give a source type \arg Ty, return a suitable result + /// such that the argument will be returned in memory. + ABIArgInfo getIndirectReturnResult(QualType Ty) const; + + /// getIndirectResult - Give a source type \arg Ty, return a suitable result + /// such that the argument will be passed in memory. + /// + /// \param freeIntRegs - The number of free integer registers remaining + /// available. + ABIArgInfo getIndirectResult(QualType Ty, unsigned freeIntRegs) const; + + ABIArgInfo classifyReturnType(QualType RetTy) const; + + ABIArgInfo classifyArgumentType(QualType Ty, unsigned freeIntRegs, + unsigned &neededInt, unsigned &neededSSE, + bool isNamedArg, + bool IsRegCall = false) const; + + ABIArgInfo classifyRegCallStructType(QualType Ty, unsigned &NeededInt, + unsigned &NeededSSE, + unsigned &MaxVectorWidth) const; + + ABIArgInfo classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt, + unsigned &NeededSSE, + unsigned &MaxVectorWidth) const; + + bool IsIllegalVectorType(QualType Ty) const; + + /// The 0.98 ABI revision clarified a lot of ambiguities, + /// unfortunately in ways that were not always consistent with + /// certain previous compilers. In particular, platforms which + /// required strict binary compatibility with older versions of GCC + /// may need to exempt themselves. + bool honorsRevision0_98() const { + return !getTarget().getTriple().isOSDarwin(); + } + + /// GCC classifies <1 x long long> as SSE but some platform ABIs choose to + /// classify it as INTEGER (for compatibility with older clang compilers). + bool classifyIntegerMMXAsSSE() const { + // Clang <= 3.8 did not do this. + if (getContext().getLangOpts().getClangABICompat() <= + LangOptions::ClangABI::Ver3_8) + return false; + + const llvm::Triple &Triple = getTarget().getTriple(); + if (Triple.isOSDarwin() || Triple.isPS() || Triple.isOSFreeBSD()) + return false; + return true; + } + + // GCC classifies vectors of __int128 as memory. + bool passInt128VectorsInMem() const { + // Clang <= 9.0 did not do this. + if (getContext().getLangOpts().getClangABICompat() <= + LangOptions::ClangABI::Ver9) + return false; + + const llvm::Triple &T = getTarget().getTriple(); + return T.isOSLinux() || T.isOSNetBSD(); + } + + X86AVXABILevel AVXLevel; + // Some ABIs (e.g. X32 ABI and Native Client OS) use 32 bit pointers on + // 64-bit hardware. + bool Has64BitPointers; + +public: + X86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel) + : ABIInfo(CGT), AVXLevel(AVXLevel), + Has64BitPointers(CGT.getDataLayout().getPointerSize(0) == 8) {} + + bool isPassedUsingAVXType(QualType type) const { + unsigned neededInt, neededSSE; + // The freeIntRegs argument doesn't matter here. + ABIArgInfo info = classifyArgumentType(type, 0, neededInt, neededSSE, + /*isNamedArg*/true); + if (info.isDirect()) { + llvm::Type *ty = info.getCoerceToType(); + if (llvm::VectorType *vectorTy = dyn_cast_or_null(ty)) + return vectorTy->getPrimitiveSizeInBits().getFixedValue() > 128; + } + return false; + } + + void computeInfo(CGFunctionInfo &FI) const override; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + bool has64BitPointers() const { + return Has64BitPointers; + } +}; + +/// WinX86_64ABIInfo - The Windows X86_64 ABI information. +class WinX86_64ABIInfo : public ABIInfo { +public: + WinX86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel) + : ABIInfo(CGT), AVXLevel(AVXLevel), + IsMingw64(getTarget().getTriple().isWindowsGNUEnvironment()) {} + + void computeInfo(CGFunctionInfo &FI) const override; + + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; + + bool isHomogeneousAggregateBaseType(QualType Ty) const override { + // FIXME: Assumes vectorcall is in use. + return isX86VectorTypeForVectorCall(getContext(), Ty); + } + + bool isHomogeneousAggregateSmallEnough(const Type *Ty, + uint64_t NumMembers) const override { + // FIXME: Assumes vectorcall is in use. + return isX86VectorCallAggregateSmallEnough(NumMembers); + } + +private: + ABIArgInfo classify(QualType Ty, unsigned &FreeSSERegs, bool IsReturnType, + bool IsVectorCall, bool IsRegCall) const; + ABIArgInfo reclassifyHvaArgForVectorCall(QualType Ty, unsigned &FreeSSERegs, + const ABIArgInfo ¤t) const; + + X86AVXABILevel AVXLevel; + + bool IsMingw64; +}; + +class X86_64TargetCodeGenInfo : public TargetCodeGenInfo { +public: + X86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel) + : TargetCodeGenInfo(std::make_unique(CGT, AVXLevel)) { + SwiftInfo = + std::make_unique(CGT, /*SwiftErrorInRegister=*/true); + } + + /// Disable tail call on x86-64. The epilogue code before the tail jump blocks + /// autoreleaseRV/retainRV and autoreleaseRV/unsafeClaimRV optimizations. + bool markARCOptimizedReturnCallsAsNoTail() const override { return true; } + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { + return 7; + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8); + + // 0-15 are the 16 integer registers. + // 16 is %rip. + AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16); + return false; + } + + llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF, + StringRef Constraint, + llvm::Type* Ty) const override { + return X86AdjustInlineAsmType(CGF, Constraint, Ty); + } + + bool isNoProtoCallVariadic(const CallArgList &args, + const FunctionNoProtoType *fnType) const override { + // The default CC on x86-64 sets %al to the number of SSA + // registers used, and GCC sets this when calling an unprototyped + // function, so we override the default behavior. However, don't do + // that when AVX types are involved: the ABI explicitly states it is + // undefined, and it doesn't work in practice because of how the ABI + // defines varargs anyway. + if (fnType->getCallConv() == CC_C) { + bool HasAVXType = false; + for (CallArgList::const_iterator + it = args.begin(), ie = args.end(); it != ie; ++it) { + if (getABIInfo().isPassedUsingAVXType(it->Ty)) { + HasAVXType = true; + break; + } + } + + if (!HasAVXType) + return true; + } + + return TargetCodeGenInfo::isNoProtoCallVariadic(args, fnType); + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override { + if (GV->isDeclaration()) + return; + if (const FunctionDecl *FD = dyn_cast_or_null(D)) { + if (FD->hasAttr()) { + llvm::Function *Fn = cast(GV); + Fn->addFnAttr("stackrealign"); + } + + addX86InterruptAttrs(FD, GV, CGM); + } + } + + void checkFunctionCallABI(CodeGenModule &CGM, SourceLocation CallLoc, + const FunctionDecl *Caller, + const FunctionDecl *Callee, + const CallArgList &Args) const override; +}; +} // namespace + +static void initFeatureMaps(const ASTContext &Ctx, + llvm::StringMap &CallerMap, + const FunctionDecl *Caller, + llvm::StringMap &CalleeMap, + const FunctionDecl *Callee) { + if (CalleeMap.empty() && CallerMap.empty()) { + // The caller is potentially nullptr in the case where the call isn't in a + // function. In this case, the getFunctionFeatureMap ensures we just get + // the TU level setting (since it cannot be modified by 'target'.. + Ctx.getFunctionFeatureMap(CallerMap, Caller); + Ctx.getFunctionFeatureMap(CalleeMap, Callee); + } +} + +static bool checkAVXParamFeature(DiagnosticsEngine &Diag, + SourceLocation CallLoc, + const llvm::StringMap &CallerMap, + const llvm::StringMap &CalleeMap, + QualType Ty, StringRef Feature, + bool IsArgument) { + bool CallerHasFeat = CallerMap.lookup(Feature); + bool CalleeHasFeat = CalleeMap.lookup(Feature); + if (!CallerHasFeat && !CalleeHasFeat) + return Diag.Report(CallLoc, diag::warn_avx_calling_convention) + << IsArgument << Ty << Feature; + + // Mixing calling conventions here is very clearly an error. + if (!CallerHasFeat || !CalleeHasFeat) + return Diag.Report(CallLoc, diag::err_avx_calling_convention) + << IsArgument << Ty << Feature; + + // Else, both caller and callee have the required feature, so there is no need + // to diagnose. + return false; +} + +static bool checkAVXParam(DiagnosticsEngine &Diag, ASTContext &Ctx, + SourceLocation CallLoc, + const llvm::StringMap &CallerMap, + const llvm::StringMap &CalleeMap, QualType Ty, + bool IsArgument) { + uint64_t Size = Ctx.getTypeSize(Ty); + if (Size > 256) + return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty, + "avx512f", IsArgument); + + if (Size > 128) + return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty, "avx", + IsArgument); + + return false; +} + +void X86_64TargetCodeGenInfo::checkFunctionCallABI( + CodeGenModule &CGM, SourceLocation CallLoc, const FunctionDecl *Caller, + const FunctionDecl *Callee, const CallArgList &Args) const { + llvm::StringMap CallerMap; + llvm::StringMap CalleeMap; + unsigned ArgIndex = 0; + + // We need to loop through the actual call arguments rather than the + // function's parameters, in case this variadic. + for (const CallArg &Arg : Args) { + // The "avx" feature changes how vectors >128 in size are passed. "avx512f" + // additionally changes how vectors >256 in size are passed. Like GCC, we + // warn when a function is called with an argument where this will change. + // Unlike GCC, we also error when it is an obvious ABI mismatch, that is, + // the caller and callee features are mismatched. + // Unfortunately, we cannot do this diagnostic in SEMA, since the callee can + // change its ABI with attribute-target after this call. + if (Arg.getType()->isVectorType() && + CGM.getContext().getTypeSize(Arg.getType()) > 128) { + initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee); + QualType Ty = Arg.getType(); + // The CallArg seems to have desugared the type already, so for clearer + // diagnostics, replace it with the type in the FunctionDecl if possible. + if (ArgIndex < Callee->getNumParams()) + Ty = Callee->getParamDecl(ArgIndex)->getType(); + + if (checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap, + CalleeMap, Ty, /*IsArgument*/ true)) + return; + } + ++ArgIndex; + } + + // Check return always, as we don't have a good way of knowing in codegen + // whether this value is used, tail-called, etc. + if (Callee->getReturnType()->isVectorType() && + CGM.getContext().getTypeSize(Callee->getReturnType()) > 128) { + initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee); + checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap, + CalleeMap, Callee->getReturnType(), + /*IsArgument*/ false); + } +} + +std::string TargetCodeGenInfo::qualifyWindowsLibrary(StringRef Lib) { + // If the argument does not end in .lib, automatically add the suffix. + // If the argument contains a space, enclose it in quotes. + // This matches the behavior of MSVC. + bool Quote = Lib.contains(' '); + std::string ArgStr = Quote ? "\"" : ""; + ArgStr += Lib; + if (!Lib.ends_with_insensitive(".lib") && !Lib.ends_with_insensitive(".a")) + ArgStr += ".lib"; + ArgStr += Quote ? "\"" : ""; + return ArgStr; +} + +namespace { +class WinX86_32TargetCodeGenInfo : public X86_32TargetCodeGenInfo { +public: + WinX86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, + bool DarwinVectorABI, bool RetSmallStructInRegABI, bool Win32StructABI, + unsigned NumRegisterParameters) + : X86_32TargetCodeGenInfo(CGT, DarwinVectorABI, RetSmallStructInRegABI, + Win32StructABI, NumRegisterParameters, false) {} + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override; + + void getDependentLibraryOption(llvm::StringRef Lib, + llvm::SmallString<24> &Opt) const override { + Opt = "/DEFAULTLIB:"; + Opt += qualifyWindowsLibrary(Lib); + } + + void getDetectMismatchOption(llvm::StringRef Name, + llvm::StringRef Value, + llvm::SmallString<32> &Opt) const override { + Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; + } +}; +} // namespace + +void WinX86_32TargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { + X86_32TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); + if (GV->isDeclaration()) + return; + addStackProbeTargetAttributes(D, GV, CGM); +} + +namespace { +class WinX86_64TargetCodeGenInfo : public TargetCodeGenInfo { +public: + WinX86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, + X86AVXABILevel AVXLevel) + : TargetCodeGenInfo(std::make_unique(CGT, AVXLevel)) { + SwiftInfo = + std::make_unique(CGT, /*SwiftErrorInRegister=*/true); + } + + void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, + CodeGen::CodeGenModule &CGM) const override; + + int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override { + return 7; + } + + bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF, + llvm::Value *Address) const override { + llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8); + + // 0-15 are the 16 integer registers. + // 16 is %rip. + AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16); + return false; + } + + void getDependentLibraryOption(llvm::StringRef Lib, + llvm::SmallString<24> &Opt) const override { + Opt = "/DEFAULTLIB:"; + Opt += qualifyWindowsLibrary(Lib); + } + + void getDetectMismatchOption(llvm::StringRef Name, + llvm::StringRef Value, + llvm::SmallString<32> &Opt) const override { + Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\""; + } +}; +} // namespace + +void WinX86_64TargetCodeGenInfo::setTargetAttributes( + const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const { + TargetCodeGenInfo::setTargetAttributes(D, GV, CGM); + if (GV->isDeclaration()) + return; + if (const FunctionDecl *FD = dyn_cast_or_null(D)) { + if (FD->hasAttr()) { + llvm::Function *Fn = cast(GV); + Fn->addFnAttr("stackrealign"); + } + + addX86InterruptAttrs(FD, GV, CGM); + } + + addStackProbeTargetAttributes(D, GV, CGM); +} + +void X86_64ABIInfo::postMerge(unsigned AggregateSize, Class &Lo, + Class &Hi) const { + // AMD64-ABI 3.2.3p2: Rule 5. Then a post merger cleanup is done: + // + // (a) If one of the classes is Memory, the whole argument is passed in + // memory. + // + // (b) If X87UP is not preceded by X87, the whole argument is passed in + // memory. + // + // (c) If the size of the aggregate exceeds two eightbytes and the first + // eightbyte isn't SSE or any other eightbyte isn't SSEUP, the whole + // argument is passed in memory. NOTE: This is necessary to keep the + // ABI working for processors that don't support the __m256 type. + // + // (d) If SSEUP is not preceded by SSE or SSEUP, it is converted to SSE. + // + // Some of these are enforced by the merging logic. Others can arise + // only with unions; for example: + // union { _Complex double; unsigned; } + // + // Note that clauses (b) and (c) were added in 0.98. + // + if (Hi == Memory) + Lo = Memory; + if (Hi == X87Up && Lo != X87 && honorsRevision0_98()) + Lo = Memory; + if (AggregateSize > 128 && (Lo != SSE || Hi != SSEUp)) + Lo = Memory; + if (Hi == SSEUp && Lo != SSE) + Hi = SSE; +} + +X86_64ABIInfo::Class X86_64ABIInfo::merge(Class Accum, Class Field) { + // AMD64-ABI 3.2.3p2: Rule 4. Each field of an object is + // classified recursively so that always two fields are + // considered. The resulting class is calculated according to + // the classes of the fields in the eightbyte: + // + // (a) If both classes are equal, this is the resulting class. + // + // (b) If one of the classes is NO_CLASS, the resulting class is + // the other class. + // + // (c) If one of the classes is MEMORY, the result is the MEMORY + // class. + // + // (d) If one of the classes is INTEGER, the result is the + // INTEGER. + // + // (e) If one of the classes is X87, X87UP, COMPLEX_X87 class, + // MEMORY is used as class. + // + // (f) Otherwise class SSE is used. + + // Accum should never be memory (we should have returned) or + // ComplexX87 (because this cannot be passed in a structure). + assert((Accum != Memory && Accum != ComplexX87) && + "Invalid accumulated classification during merge."); + if (Accum == Field || Field == NoClass) + return Accum; + if (Field == Memory) + return Memory; + if (Accum == NoClass) + return Field; + if (Accum == Integer || Field == Integer) + return Integer; + if (Field == X87 || Field == X87Up || Field == ComplexX87 || + Accum == X87 || Accum == X87Up) + return Memory; + return SSE; +} + +void X86_64ABIInfo::classify(QualType Ty, uint64_t OffsetBase, Class &Lo, + Class &Hi, bool isNamedArg, bool IsRegCall) const { + // FIXME: This code can be simplified by introducing a simple value class for + // Class pairs with appropriate constructor methods for the various + // situations. + + // FIXME: Some of the split computations are wrong; unaligned vectors + // shouldn't be passed in registers for example, so there is no chance they + // can straddle an eightbyte. Verify & simplify. + + Lo = Hi = NoClass; + + Class &Current = OffsetBase < 64 ? Lo : Hi; + Current = Memory; + + if (const BuiltinType *BT = Ty->getAs()) { + BuiltinType::Kind k = BT->getKind(); + + if (k == BuiltinType::Void) { + Current = NoClass; + } else if (k == BuiltinType::Int128 || k == BuiltinType::UInt128) { + Lo = Integer; + Hi = Integer; + } else if (k >= BuiltinType::Bool && k <= BuiltinType::LongLong) { + Current = Integer; + } else if (k == BuiltinType::Float || k == BuiltinType::Double || + k == BuiltinType::Float16 || k == BuiltinType::BFloat16) { + Current = SSE; + } else if (k == BuiltinType::LongDouble) { + const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat(); + if (LDF == &llvm::APFloat::IEEEquad()) { + Lo = SSE; + Hi = SSEUp; + } else if (LDF == &llvm::APFloat::x87DoubleExtended()) { + Lo = X87; + Hi = X87Up; + } else if (LDF == &llvm::APFloat::IEEEdouble()) { + Current = SSE; + } else + llvm_unreachable("unexpected long double representation!"); + } + // FIXME: _Decimal32 and _Decimal64 are SSE. + // FIXME: _float128 and _Decimal128 are (SSE, SSEUp). + return; + } + + if (const EnumType *ET = Ty->getAs()) { + // Classify the underlying integer type. + classify(ET->getDecl()->getIntegerType(), OffsetBase, Lo, Hi, isNamedArg); + return; + } + + if (Ty->hasPointerRepresentation()) { + Current = Integer; + return; + } + + if (Ty->isMemberPointerType()) { + if (Ty->isMemberFunctionPointerType()) { + if (Has64BitPointers) { + // If Has64BitPointers, this is an {i64, i64}, so classify both + // Lo and Hi now. + Lo = Hi = Integer; + } else { + // Otherwise, with 32-bit pointers, this is an {i32, i32}. If that + // straddles an eightbyte boundary, Hi should be classified as well. + uint64_t EB_FuncPtr = (OffsetBase) / 64; + uint64_t EB_ThisAdj = (OffsetBase + 64 - 1) / 64; + if (EB_FuncPtr != EB_ThisAdj) { + Lo = Hi = Integer; + } else { + Current = Integer; + } + } + } else { + Current = Integer; + } + return; + } + + if (const VectorType *VT = Ty->getAs()) { + uint64_t Size = getContext().getTypeSize(VT); + if (Size == 1 || Size == 8 || Size == 16 || Size == 32) { + // gcc passes the following as integer: + // 4 bytes - <4 x char>, <2 x short>, <1 x int>, <1 x float> + // 2 bytes - <2 x char>, <1 x short> + // 1 byte - <1 x char> + Current = Integer; + + // If this type crosses an eightbyte boundary, it should be + // split. + uint64_t EB_Lo = (OffsetBase) / 64; + uint64_t EB_Hi = (OffsetBase + Size - 1) / 64; + if (EB_Lo != EB_Hi) + Hi = Lo; + } else if (Size == 64) { + QualType ElementType = VT->getElementType(); + + // gcc passes <1 x double> in memory. :( + if (ElementType->isSpecificBuiltinType(BuiltinType::Double)) + return; + + // gcc passes <1 x long long> as SSE but clang used to unconditionally + // pass them as integer. For platforms where clang is the de facto + // platform compiler, we must continue to use integer. + if (!classifyIntegerMMXAsSSE() && + (ElementType->isSpecificBuiltinType(BuiltinType::LongLong) || + ElementType->isSpecificBuiltinType(BuiltinType::ULongLong) || + ElementType->isSpecificBuiltinType(BuiltinType::Long) || + ElementType->isSpecificBuiltinType(BuiltinType::ULong))) + Current = Integer; + else + Current = SSE; + + // If this type crosses an eightbyte boundary, it should be + // split. + if (OffsetBase && OffsetBase != 64) + Hi = Lo; + } else if (Size == 128 || + (isNamedArg && Size <= getNativeVectorSizeForAVXABI(AVXLevel))) { + QualType ElementType = VT->getElementType(); + + // gcc passes 256 and 512 bit vectors in memory. :( + if (passInt128VectorsInMem() && Size != 128 && + (ElementType->isSpecificBuiltinType(BuiltinType::Int128) || + ElementType->isSpecificBuiltinType(BuiltinType::UInt128))) + return; + + // Arguments of 256-bits are split into four eightbyte chunks. The + // least significant one belongs to class SSE and all the others to class + // SSEUP. The original Lo and Hi design considers that types can't be + // greater than 128-bits, so a 64-bit split in Hi and Lo makes sense. + // This design isn't correct for 256-bits, but since there're no cases + // where the upper parts would need to be inspected, avoid adding + // complexity and just consider Hi to match the 64-256 part. + // + // Note that per 3.5.7 of AMD64-ABI, 256-bit args are only passed in + // registers if they are "named", i.e. not part of the "..." of a + // variadic function. + // + // Similarly, per 3.2.3. of the AVX512 draft, 512-bits ("named") args are + // split into eight eightbyte chunks, one SSE and seven SSEUP. + Lo = SSE; + Hi = SSEUp; + } + return; + } + + if (const ComplexType *CT = Ty->getAs()) { + QualType ET = getContext().getCanonicalType(CT->getElementType()); + + uint64_t Size = getContext().getTypeSize(Ty); + if (ET->isIntegralOrEnumerationType()) { + if (Size <= 64) + Current = Integer; + else if (Size <= 128) + Lo = Hi = Integer; + } else if (ET->isFloat16Type() || ET == getContext().FloatTy || + ET->isBFloat16Type()) { + Current = SSE; + } else if (ET == getContext().DoubleTy) { + Lo = Hi = SSE; + } else if (ET == getContext().LongDoubleTy) { + const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat(); + if (LDF == &llvm::APFloat::IEEEquad()) + Current = Memory; + else if (LDF == &llvm::APFloat::x87DoubleExtended()) + Current = ComplexX87; + else if (LDF == &llvm::APFloat::IEEEdouble()) + Lo = Hi = SSE; + else + llvm_unreachable("unexpected long double representation!"); + } + + // If this complex type crosses an eightbyte boundary then it + // should be split. + uint64_t EB_Real = (OffsetBase) / 64; + uint64_t EB_Imag = (OffsetBase + getContext().getTypeSize(ET)) / 64; + if (Hi == NoClass && EB_Real != EB_Imag) + Hi = Lo; + + return; + } + + if (const auto *EITy = Ty->getAs()) { + if (EITy->getNumBits() <= 64) + Current = Integer; + else if (EITy->getNumBits() <= 128) + Lo = Hi = Integer; + // Larger values need to get passed in memory. + return; + } + + if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) { + // Arrays are treated like structures. + + uint64_t Size = getContext().getTypeSize(Ty); + + // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger + // than eight eightbytes, ..., it has class MEMORY. + // regcall ABI doesn't have limitation to an object. The only limitation + // is the free registers, which will be checked in computeInfo. + if (!IsRegCall && Size > 512) + return; + + // AMD64-ABI 3.2.3p2: Rule 1. If ..., or it contains unaligned + // fields, it has class MEMORY. + // + // Only need to check alignment of array base. + if (OffsetBase % getContext().getTypeAlign(AT->getElementType())) + return; + + // Otherwise implement simplified merge. We could be smarter about + // this, but it isn't worth it and would be harder to verify. + Current = NoClass; + uint64_t EltSize = getContext().getTypeSize(AT->getElementType()); + uint64_t ArraySize = AT->getSize().getZExtValue(); + + // The only case a 256-bit wide vector could be used is when the array + // contains a single 256-bit element. Since Lo and Hi logic isn't extended + // to work for sizes wider than 128, early check and fallback to memory. + // + if (Size > 128 && + (Size != EltSize || Size > getNativeVectorSizeForAVXABI(AVXLevel))) + return; + + for (uint64_t i=0, Offset=OffsetBase; igetElementType(), Offset, FieldLo, FieldHi, isNamedArg); + Lo = merge(Lo, FieldLo); + Hi = merge(Hi, FieldHi); + if (Lo == Memory || Hi == Memory) + break; + } + + postMerge(Size, Lo, Hi); + assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp array classification."); + return; + } + + if (const RecordType *RT = Ty->getAs()) { + uint64_t Size = getContext().getTypeSize(Ty); + + // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger + // than eight eightbytes, ..., it has class MEMORY. + if (Size > 512) + return; + + // AMD64-ABI 3.2.3p2: Rule 2. If a C++ object has either a non-trivial + // copy constructor or a non-trivial destructor, it is passed by invisible + // reference. + if (getRecordArgABI(RT, getCXXABI())) + return; + + const RecordDecl *RD = RT->getDecl(); + + // Assume variable sized types are passed in memory. + if (RD->hasFlexibleArrayMember()) + return; + + const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); + + // Reset Lo class, this will be recomputed. + Current = NoClass; + + // If this is a C++ record, classify the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + for (const auto &I : CXXRD->bases()) { + assert(!I.isVirtual() && !I.getType()->isDependentType() && + "Unexpected base class!"); + const auto *Base = + cast(I.getType()->castAs()->getDecl()); + + // Classify this field. + // + // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate exceeds a + // single eightbyte, each is classified separately. Each eightbyte gets + // initialized to class NO_CLASS. + Class FieldLo, FieldHi; + uint64_t Offset = + OffsetBase + getContext().toBits(Layout.getBaseClassOffset(Base)); + classify(I.getType(), Offset, FieldLo, FieldHi, isNamedArg); + Lo = merge(Lo, FieldLo); + Hi = merge(Hi, FieldHi); + if (Lo == Memory || Hi == Memory) { + postMerge(Size, Lo, Hi); + return; + } + } + } + + // Classify the fields one at a time, merging the results. + unsigned idx = 0; + bool UseClang11Compat = getContext().getLangOpts().getClangABICompat() <= + LangOptions::ClangABI::Ver11 || + getContext().getTargetInfo().getTriple().isPS(); + bool IsUnion = RT->isUnionType() && !UseClang11Compat; + + for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); + i != e; ++i, ++idx) { + uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx); + bool BitField = i->isBitField(); + + // Ignore padding bit-fields. + if (BitField && i->isUnnamedBitfield()) + continue; + + // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger than + // eight eightbytes, or it contains unaligned fields, it has class MEMORY. + // + // The only case a 256-bit or a 512-bit wide vector could be used is when + // the struct contains a single 256-bit or 512-bit element. Early check + // and fallback to memory. + // + // FIXME: Extended the Lo and Hi logic properly to work for size wider + // than 128. + if (Size > 128 && + ((!IsUnion && Size != getContext().getTypeSize(i->getType())) || + Size > getNativeVectorSizeForAVXABI(AVXLevel))) { + Lo = Memory; + postMerge(Size, Lo, Hi); + return; + } + // Note, skip this test for bit-fields, see below. + if (!BitField && Offset % getContext().getTypeAlign(i->getType())) { + Lo = Memory; + postMerge(Size, Lo, Hi); + return; + } + + // Classify this field. + // + // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate + // exceeds a single eightbyte, each is classified + // separately. Each eightbyte gets initialized to class + // NO_CLASS. + Class FieldLo, FieldHi; + + // Bit-fields require special handling, they do not force the + // structure to be passed in memory even if unaligned, and + // therefore they can straddle an eightbyte. + if (BitField) { + assert(!i->isUnnamedBitfield()); + uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx); + uint64_t Size = i->getBitWidthValue(getContext()); + + uint64_t EB_Lo = Offset / 64; + uint64_t EB_Hi = (Offset + Size - 1) / 64; + + if (EB_Lo) { + assert(EB_Hi == EB_Lo && "Invalid classification, type > 16 bytes."); + FieldLo = NoClass; + FieldHi = Integer; + } else { + FieldLo = Integer; + FieldHi = EB_Hi ? Integer : NoClass; + } + } else + classify(i->getType(), Offset, FieldLo, FieldHi, isNamedArg); + Lo = merge(Lo, FieldLo); + Hi = merge(Hi, FieldHi); + if (Lo == Memory || Hi == Memory) + break; + } + + postMerge(Size, Lo, Hi); + } +} + +ABIArgInfo X86_64ABIInfo::getIndirectReturnResult(QualType Ty) const { + // If this is a scalar LLVM value then assume LLVM will pass it in the right + // place naturally. + if (!isAggregateTypeForABI(Ty)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + if (Ty->isBitIntType()) + return getNaturalAlignIndirect(Ty); + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); + } + + return getNaturalAlignIndirect(Ty); +} + +bool X86_64ABIInfo::IsIllegalVectorType(QualType Ty) const { + if (const VectorType *VecTy = Ty->getAs()) { + uint64_t Size = getContext().getTypeSize(VecTy); + unsigned LargestVector = getNativeVectorSizeForAVXABI(AVXLevel); + if (Size <= 64 || Size > LargestVector) + return true; + QualType EltTy = VecTy->getElementType(); + if (passInt128VectorsInMem() && + (EltTy->isSpecificBuiltinType(BuiltinType::Int128) || + EltTy->isSpecificBuiltinType(BuiltinType::UInt128))) + return true; + } + + return false; +} + +ABIArgInfo X86_64ABIInfo::getIndirectResult(QualType Ty, + unsigned freeIntRegs) const { + // If this is a scalar LLVM value then assume LLVM will pass it in the right + // place naturally. + // + // This assumption is optimistic, as there could be free registers available + // when we need to pass this argument in memory, and LLVM could try to pass + // the argument in the free register. This does not seem to happen currently, + // but this code would be much safer if we could mark the argument with + // 'onstack'. See PR12193. + if (!isAggregateTypeForABI(Ty) && !IsIllegalVectorType(Ty) && + !Ty->isBitIntType()) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty) + : ABIArgInfo::getDirect()); + } + + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + + // Compute the byval alignment. We specify the alignment of the byval in all + // cases so that the mid-level optimizer knows the alignment of the byval. + unsigned Align = std::max(getContext().getTypeAlign(Ty) / 8, 8U); + + // Attempt to avoid passing indirect results using byval when possible. This + // is important for good codegen. + // + // We do this by coercing the value into a scalar type which the backend can + // handle naturally (i.e., without using byval). + // + // For simplicity, we currently only do this when we have exhausted all of the + // free integer registers. Doing this when there are free integer registers + // would require more care, as we would have to ensure that the coerced value + // did not claim the unused register. That would require either reording the + // arguments to the function (so that any subsequent inreg values came first), + // or only doing this optimization when there were no following arguments that + // might be inreg. + // + // We currently expect it to be rare (particularly in well written code) for + // arguments to be passed on the stack when there are still free integer + // registers available (this would typically imply large structs being passed + // by value), so this seems like a fair tradeoff for now. + // + // We can revisit this if the backend grows support for 'onstack' parameter + // attributes. See PR12193. + if (freeIntRegs == 0) { + uint64_t Size = getContext().getTypeSize(Ty); + + // If this type fits in an eightbyte, coerce it into the matching integral + // type, which will end up on the stack (with alignment 8). + if (Align == 8 && Size <= 64) + return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), + Size)); + } + + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(Align)); +} + +/// The ABI specifies that a value should be passed in a full vector XMM/YMM +/// register. Pick an LLVM IR type that will be passed as a vector register. +llvm::Type *X86_64ABIInfo::GetByteVectorType(QualType Ty) const { + // Wrapper structs/arrays that only contain vectors are passed just like + // vectors; strip them off if present. + if (const Type *InnerTy = isSingleElementStruct(Ty, getContext())) + Ty = QualType(InnerTy, 0); + + llvm::Type *IRType = CGT.ConvertType(Ty); + if (isa(IRType)) { + // Don't pass vXi128 vectors in their native type, the backend can't + // legalize them. + if (passInt128VectorsInMem() && + cast(IRType)->getElementType()->isIntegerTy(128)) { + // Use a vXi64 vector. + uint64_t Size = getContext().getTypeSize(Ty); + return llvm::FixedVectorType::get(llvm::Type::getInt64Ty(getVMContext()), + Size / 64); + } + + return IRType; + } + + if (IRType->getTypeID() == llvm::Type::FP128TyID) + return IRType; + + // We couldn't find the preferred IR vector type for 'Ty'. + uint64_t Size = getContext().getTypeSize(Ty); + assert((Size == 128 || Size == 256 || Size == 512) && "Invalid type found!"); + + + // Return a LLVM IR vector type based on the size of 'Ty'. + return llvm::FixedVectorType::get(llvm::Type::getDoubleTy(getVMContext()), + Size / 64); +} + +/// BitsContainNoUserData - Return true if the specified [start,end) bit range +/// is known to either be off the end of the specified type or being in +/// alignment padding. The user type specified is known to be at most 128 bits +/// in size, and have passed through X86_64ABIInfo::classify with a successful +/// classification that put one of the two halves in the INTEGER class. +/// +/// It is conservatively correct to return false. +static bool BitsContainNoUserData(QualType Ty, unsigned StartBit, + unsigned EndBit, ASTContext &Context) { + // If the bytes being queried are off the end of the type, there is no user + // data hiding here. This handles analysis of builtins, vectors and other + // types that don't contain interesting padding. + unsigned TySize = (unsigned)Context.getTypeSize(Ty); + if (TySize <= StartBit) + return true; + + if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) { + unsigned EltSize = (unsigned)Context.getTypeSize(AT->getElementType()); + unsigned NumElts = (unsigned)AT->getSize().getZExtValue(); + + // Check each element to see if the element overlaps with the queried range. + for (unsigned i = 0; i != NumElts; ++i) { + // If the element is after the span we care about, then we're done.. + unsigned EltOffset = i*EltSize; + if (EltOffset >= EndBit) break; + + unsigned EltStart = EltOffset < StartBit ? StartBit-EltOffset :0; + if (!BitsContainNoUserData(AT->getElementType(), EltStart, + EndBit-EltOffset, Context)) + return false; + } + // If it overlaps no elements, then it is safe to process as padding. + return true; + } + + if (const RecordType *RT = Ty->getAs()) { + const RecordDecl *RD = RT->getDecl(); + const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); + + // If this is a C++ record, check the bases first. + if (const CXXRecordDecl *CXXRD = dyn_cast(RD)) { + for (const auto &I : CXXRD->bases()) { + assert(!I.isVirtual() && !I.getType()->isDependentType() && + "Unexpected base class!"); + const auto *Base = + cast(I.getType()->castAs()->getDecl()); + + // If the base is after the span we care about, ignore it. + unsigned BaseOffset = Context.toBits(Layout.getBaseClassOffset(Base)); + if (BaseOffset >= EndBit) continue; + + unsigned BaseStart = BaseOffset < StartBit ? StartBit-BaseOffset :0; + if (!BitsContainNoUserData(I.getType(), BaseStart, + EndBit-BaseOffset, Context)) + return false; + } + } + + // Verify that no field has data that overlaps the region of interest. Yes + // this could be sped up a lot by being smarter about queried fields, + // however we're only looking at structs up to 16 bytes, so we don't care + // much. + unsigned idx = 0; + for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); + i != e; ++i, ++idx) { + unsigned FieldOffset = (unsigned)Layout.getFieldOffset(idx); + + // If we found a field after the region we care about, then we're done. + if (FieldOffset >= EndBit) break; + + unsigned FieldStart = FieldOffset < StartBit ? StartBit-FieldOffset :0; + if (!BitsContainNoUserData(i->getType(), FieldStart, EndBit-FieldOffset, + Context)) + return false; + } + + // If nothing in this record overlapped the area of interest, then we're + // clean. + return true; + } + + return false; +} + +/// getFPTypeAtOffset - Return a floating point type at the specified offset. +static llvm::Type *getFPTypeAtOffset(llvm::Type *IRType, unsigned IROffset, + const llvm::DataLayout &TD) { + if (IROffset == 0 && IRType->isFloatingPointTy()) + return IRType; + + // If this is a struct, recurse into the field at the specified offset. + if (llvm::StructType *STy = dyn_cast(IRType)) { + if (!STy->getNumContainedTypes()) + return nullptr; + + const llvm::StructLayout *SL = TD.getStructLayout(STy); + unsigned Elt = SL->getElementContainingOffset(IROffset); + IROffset -= SL->getElementOffset(Elt); + return getFPTypeAtOffset(STy->getElementType(Elt), IROffset, TD); + } + + // If this is an array, recurse into the field at the specified offset. + if (llvm::ArrayType *ATy = dyn_cast(IRType)) { + llvm::Type *EltTy = ATy->getElementType(); + unsigned EltSize = TD.getTypeAllocSize(EltTy); + IROffset -= IROffset / EltSize * EltSize; + return getFPTypeAtOffset(EltTy, IROffset, TD); + } + + return nullptr; +} + +/// GetSSETypeAtOffset - Return a type that will be passed by the backend in the +/// low 8 bytes of an XMM register, corresponding to the SSE class. +llvm::Type *X86_64ABIInfo:: +GetSSETypeAtOffset(llvm::Type *IRType, unsigned IROffset, + QualType SourceTy, unsigned SourceOffset) const { + const llvm::DataLayout &TD = getDataLayout(); + unsigned SourceSize = + (unsigned)getContext().getTypeSize(SourceTy) / 8 - SourceOffset; + llvm::Type *T0 = getFPTypeAtOffset(IRType, IROffset, TD); + if (!T0 || T0->isDoubleTy()) + return llvm::Type::getDoubleTy(getVMContext()); + + // Get the adjacent FP type. + llvm::Type *T1 = nullptr; + unsigned T0Size = TD.getTypeAllocSize(T0); + if (SourceSize > T0Size) + T1 = getFPTypeAtOffset(IRType, IROffset + T0Size, TD); + if (T1 == nullptr) { + // Check if IRType is a half/bfloat + float. float type will be in IROffset+4 due + // to its alignment. + if (T0->is16bitFPTy() && SourceSize > 4) + T1 = getFPTypeAtOffset(IRType, IROffset + 4, TD); + // If we can't get a second FP type, return a simple half or float. + // avx512fp16-abi.c:pr51813_2 shows it works to return float for + // {float, i8} too. + if (T1 == nullptr) + return T0; + } + + if (T0->isFloatTy() && T1->isFloatTy()) + return llvm::FixedVectorType::get(T0, 2); + + if (T0->is16bitFPTy() && T1->is16bitFPTy()) { + llvm::Type *T2 = nullptr; + if (SourceSize > 4) + T2 = getFPTypeAtOffset(IRType, IROffset + 4, TD); + if (T2 == nullptr) + return llvm::FixedVectorType::get(T0, 2); + return llvm::FixedVectorType::get(T0, 4); + } + + if (T0->is16bitFPTy() || T1->is16bitFPTy()) + return llvm::FixedVectorType::get(llvm::Type::getHalfTy(getVMContext()), 4); + + return llvm::Type::getDoubleTy(getVMContext()); +} + + +/// GetINTEGERTypeAtOffset - The ABI specifies that a value should be passed in +/// an 8-byte GPR. This means that we either have a scalar or we are talking +/// about the high or low part of an up-to-16-byte struct. This routine picks +/// the best LLVM IR type to represent this, which may be i64 or may be anything +/// else that the backend will pass in a GPR that works better (e.g. i8, %foo*, +/// etc). +/// +/// PrefType is an LLVM IR type that corresponds to (part of) the IR type for +/// the source type. IROffset is an offset in bytes into the LLVM IR type that +/// the 8-byte value references. PrefType may be null. +/// +/// SourceTy is the source-level type for the entire argument. SourceOffset is +/// an offset into this that we're processing (which is always either 0 or 8). +/// +llvm::Type *X86_64ABIInfo:: +GetINTEGERTypeAtOffset(llvm::Type *IRType, unsigned IROffset, + QualType SourceTy, unsigned SourceOffset) const { + // If we're dealing with an un-offset LLVM IR type, then it means that we're + // returning an 8-byte unit starting with it. See if we can safely use it. + if (IROffset == 0) { + // Pointers and int64's always fill the 8-byte unit. + if ((isa(IRType) && Has64BitPointers) || + IRType->isIntegerTy(64)) + return IRType; + + // If we have a 1/2/4-byte integer, we can use it only if the rest of the + // goodness in the source type is just tail padding. This is allowed to + // kick in for struct {double,int} on the int, but not on + // struct{double,int,int} because we wouldn't return the second int. We + // have to do this analysis on the source type because we can't depend on + // unions being lowered a specific way etc. + if (IRType->isIntegerTy(8) || IRType->isIntegerTy(16) || + IRType->isIntegerTy(32) || + (isa(IRType) && !Has64BitPointers)) { + unsigned BitWidth = isa(IRType) ? 32 : + cast(IRType)->getBitWidth(); + + if (BitsContainNoUserData(SourceTy, SourceOffset*8+BitWidth, + SourceOffset*8+64, getContext())) + return IRType; + } + } + + if (llvm::StructType *STy = dyn_cast(IRType)) { + // If this is a struct, recurse into the field at the specified offset. + const llvm::StructLayout *SL = getDataLayout().getStructLayout(STy); + if (IROffset < SL->getSizeInBytes()) { + unsigned FieldIdx = SL->getElementContainingOffset(IROffset); + IROffset -= SL->getElementOffset(FieldIdx); + + return GetINTEGERTypeAtOffset(STy->getElementType(FieldIdx), IROffset, + SourceTy, SourceOffset); + } + } + + if (llvm::ArrayType *ATy = dyn_cast(IRType)) { + llvm::Type *EltTy = ATy->getElementType(); + unsigned EltSize = getDataLayout().getTypeAllocSize(EltTy); + unsigned EltOffset = IROffset/EltSize*EltSize; + return GetINTEGERTypeAtOffset(EltTy, IROffset-EltOffset, SourceTy, + SourceOffset); + } + + // Okay, we don't have any better idea of what to pass, so we pass this in an + // integer register that isn't too big to fit the rest of the struct. + unsigned TySizeInBytes = + (unsigned)getContext().getTypeSizeInChars(SourceTy).getQuantity(); + + assert(TySizeInBytes != SourceOffset && "Empty field?"); + + // It is always safe to classify this as an integer type up to i64 that + // isn't larger than the structure. + return llvm::IntegerType::get(getVMContext(), + std::min(TySizeInBytes-SourceOffset, 8U)*8); +} + + +/// GetX86_64ByValArgumentPair - Given a high and low type that can ideally +/// be used as elements of a two register pair to pass or return, return a +/// first class aggregate to represent them. For example, if the low part of +/// a by-value argument should be passed as i32* and the high part as float, +/// return {i32*, float}. +static llvm::Type * +GetX86_64ByValArgumentPair(llvm::Type *Lo, llvm::Type *Hi, + const llvm::DataLayout &TD) { + // In order to correctly satisfy the ABI, we need to the high part to start + // at offset 8. If the high and low parts we inferred are both 4-byte types + // (e.g. i32 and i32) then the resultant struct type ({i32,i32}) won't have + // the second element at offset 8. Check for this: + unsigned LoSize = (unsigned)TD.getTypeAllocSize(Lo); + llvm::Align HiAlign = TD.getABITypeAlign(Hi); + unsigned HiStart = llvm::alignTo(LoSize, HiAlign); + assert(HiStart != 0 && HiStart <= 8 && "Invalid x86-64 argument pair!"); + + // To handle this, we have to increase the size of the low part so that the + // second element will start at an 8 byte offset. We can't increase the size + // of the second element because it might make us access off the end of the + // struct. + if (HiStart != 8) { + // There are usually two sorts of types the ABI generation code can produce + // for the low part of a pair that aren't 8 bytes in size: half, float or + // i8/i16/i32. This can also include pointers when they are 32-bit (X32 and + // NaCl). + // Promote these to a larger type. + if (Lo->isHalfTy() || Lo->isFloatTy()) + Lo = llvm::Type::getDoubleTy(Lo->getContext()); + else { + assert((Lo->isIntegerTy() || Lo->isPointerTy()) + && "Invalid/unknown lo type"); + Lo = llvm::Type::getInt64Ty(Lo->getContext()); + } + } + + llvm::StructType *Result = llvm::StructType::get(Lo, Hi); + + // Verify that the second element is at an 8-byte offset. + assert(TD.getStructLayout(Result)->getElementOffset(1) == 8 && + "Invalid x86-64 argument pair!"); + return Result; +} + +ABIArgInfo X86_64ABIInfo:: +classifyReturnType(QualType RetTy) const { + // AMD64-ABI 3.2.3p4: Rule 1. Classify the return type with the + // classification algorithm. + X86_64ABIInfo::Class Lo, Hi; + classify(RetTy, 0, Lo, Hi, /*isNamedArg*/ true); + + // Check some invariants. + assert((Hi != Memory || Lo == Memory) && "Invalid memory classification."); + assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification."); + + llvm::Type *ResType = nullptr; + switch (Lo) { + case NoClass: + if (Hi == NoClass) + return ABIArgInfo::getIgnore(); + // If the low part is just padding, it takes no register, leave ResType + // null. + assert((Hi == SSE || Hi == Integer || Hi == X87Up) && + "Unknown missing lo part"); + break; + + case SSEUp: + case X87Up: + llvm_unreachable("Invalid classification for lo word."); + + // AMD64-ABI 3.2.3p4: Rule 2. Types of class memory are returned via + // hidden argument. + case Memory: + return getIndirectReturnResult(RetTy); + + // AMD64-ABI 3.2.3p4: Rule 3. If the class is INTEGER, the next + // available register of the sequence %rax, %rdx is used. + case Integer: + ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0); + + // If we have a sign or zero extended integer, make sure to return Extend + // so that the parameter gets the right LLVM IR attributes. + if (Hi == NoClass && isa(ResType)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = RetTy->getAs()) + RetTy = EnumTy->getDecl()->getIntegerType(); + + if (RetTy->isIntegralOrEnumerationType() && + isPromotableIntegerTypeForABI(RetTy)) + return ABIArgInfo::getExtend(RetTy); + } + break; + + // AMD64-ABI 3.2.3p4: Rule 4. If the class is SSE, the next + // available SSE register of the sequence %xmm0, %xmm1 is used. + case SSE: + ResType = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0); + break; + + // AMD64-ABI 3.2.3p4: Rule 6. If the class is X87, the value is + // returned on the X87 stack in %st0 as 80-bit x87 number. + case X87: + ResType = llvm::Type::getX86_FP80Ty(getVMContext()); + break; + + // AMD64-ABI 3.2.3p4: Rule 8. If the class is COMPLEX_X87, the real + // part of the value is returned in %st0 and the imaginary part in + // %st1. + case ComplexX87: + assert(Hi == ComplexX87 && "Unexpected ComplexX87 classification."); + ResType = llvm::StructType::get(llvm::Type::getX86_FP80Ty(getVMContext()), + llvm::Type::getX86_FP80Ty(getVMContext())); + break; + } + + llvm::Type *HighPart = nullptr; + switch (Hi) { + // Memory was handled previously and X87 should + // never occur as a hi class. + case Memory: + case X87: + llvm_unreachable("Invalid classification for hi word."); + + case ComplexX87: // Previously handled. + case NoClass: + break; + + case Integer: + HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8); + if (Lo == NoClass) // Return HighPart at offset 8 in memory. + return ABIArgInfo::getDirect(HighPart, 8); + break; + case SSE: + HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8); + if (Lo == NoClass) // Return HighPart at offset 8 in memory. + return ABIArgInfo::getDirect(HighPart, 8); + break; + + // AMD64-ABI 3.2.3p4: Rule 5. If the class is SSEUP, the eightbyte + // is passed in the next available eightbyte chunk if the last used + // vector register. + // + // SSEUP should always be preceded by SSE, just widen. + case SSEUp: + assert(Lo == SSE && "Unexpected SSEUp classification."); + ResType = GetByteVectorType(RetTy); + break; + + // AMD64-ABI 3.2.3p4: Rule 7. If the class is X87UP, the value is + // returned together with the previous X87 value in %st0. + case X87Up: + // If X87Up is preceded by X87, we don't need to do + // anything. However, in some cases with unions it may not be + // preceded by X87. In such situations we follow gcc and pass the + // extra bits in an SSE reg. + if (Lo != X87) { + HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8); + if (Lo == NoClass) // Return HighPart at offset 8 in memory. + return ABIArgInfo::getDirect(HighPart, 8); + } + break; + } + + // If a high part was specified, merge it together with the low part. It is + // known to pass in the high eightbyte of the result. We do this by forming a + // first class struct aggregate with the high and low part: {low, high} + if (HighPart) + ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout()); + + return ABIArgInfo::getDirect(ResType); +} + +ABIArgInfo +X86_64ABIInfo::classifyArgumentType(QualType Ty, unsigned freeIntRegs, + unsigned &neededInt, unsigned &neededSSE, + bool isNamedArg, bool IsRegCall) const { + Ty = useFirstFieldIfTransparentUnion(Ty); + + X86_64ABIInfo::Class Lo, Hi; + classify(Ty, 0, Lo, Hi, isNamedArg, IsRegCall); + + // Check some invariants. + // FIXME: Enforce these by construction. + assert((Hi != Memory || Lo == Memory) && "Invalid memory classification."); + assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification."); + + neededInt = 0; + neededSSE = 0; + llvm::Type *ResType = nullptr; + switch (Lo) { + case NoClass: + if (Hi == NoClass) + return ABIArgInfo::getIgnore(); + // If the low part is just padding, it takes no register, leave ResType + // null. + assert((Hi == SSE || Hi == Integer || Hi == X87Up) && + "Unknown missing lo part"); + break; + + // AMD64-ABI 3.2.3p3: Rule 1. If the class is MEMORY, pass the argument + // on the stack. + case Memory: + + // AMD64-ABI 3.2.3p3: Rule 5. If the class is X87, X87UP or + // COMPLEX_X87, it is passed in memory. + case X87: + case ComplexX87: + if (getRecordArgABI(Ty, getCXXABI()) == CGCXXABI::RAA_Indirect) + ++neededInt; + return getIndirectResult(Ty, freeIntRegs); + + case SSEUp: + case X87Up: + llvm_unreachable("Invalid classification for lo word."); + + // AMD64-ABI 3.2.3p3: Rule 2. If the class is INTEGER, the next + // available register of the sequence %rdi, %rsi, %rdx, %rcx, %r8 + // and %r9 is used. + case Integer: + ++neededInt; + + // Pick an 8-byte type based on the preferred type. + ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 0, Ty, 0); + + // If we have a sign or zero extended integer, make sure to return Extend + // so that the parameter gets the right LLVM IR attributes. + if (Hi == NoClass && isa(ResType)) { + // Treat an enum type as its underlying type. + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + if (Ty->isIntegralOrEnumerationType() && + isPromotableIntegerTypeForABI(Ty)) + return ABIArgInfo::getExtend(Ty); + } + + break; + + // AMD64-ABI 3.2.3p3: Rule 3. If the class is SSE, the next + // available SSE register is used, the registers are taken in the + // order from %xmm0 to %xmm7. + case SSE: { + llvm::Type *IRType = CGT.ConvertType(Ty); + ResType = GetSSETypeAtOffset(IRType, 0, Ty, 0); + ++neededSSE; + break; + } + } + + llvm::Type *HighPart = nullptr; + switch (Hi) { + // Memory was handled previously, ComplexX87 and X87 should + // never occur as hi classes, and X87Up must be preceded by X87, + // which is passed in memory. + case Memory: + case X87: + case ComplexX87: + llvm_unreachable("Invalid classification for hi word."); + + case NoClass: break; + + case Integer: + ++neededInt; + // Pick an 8-byte type based on the preferred type. + HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8); + + if (Lo == NoClass) // Pass HighPart at offset 8 in memory. + return ABIArgInfo::getDirect(HighPart, 8); + break; + + // X87Up generally doesn't occur here (long double is passed in + // memory), except in situations involving unions. + case X87Up: + case SSE: + HighPart = GetSSETypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8); + + if (Lo == NoClass) // Pass HighPart at offset 8 in memory. + return ABIArgInfo::getDirect(HighPart, 8); + + ++neededSSE; + break; + + // AMD64-ABI 3.2.3p3: Rule 4. If the class is SSEUP, the + // eightbyte is passed in the upper half of the last used SSE + // register. This only happens when 128-bit vectors are passed. + case SSEUp: + assert(Lo == SSE && "Unexpected SSEUp classification"); + ResType = GetByteVectorType(Ty); + break; + } + + // If a high part was specified, merge it together with the low part. It is + // known to pass in the high eightbyte of the result. We do this by forming a + // first class struct aggregate with the high and low part: {low, high} + if (HighPart) + ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout()); + + return ABIArgInfo::getDirect(ResType); +} + +ABIArgInfo +X86_64ABIInfo::classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt, + unsigned &NeededSSE, + unsigned &MaxVectorWidth) const { + auto RT = Ty->getAs(); + assert(RT && "classifyRegCallStructType only valid with struct types"); + + if (RT->getDecl()->hasFlexibleArrayMember()) + return getIndirectReturnResult(Ty); + + // Sum up bases + if (auto CXXRD = dyn_cast(RT->getDecl())) { + if (CXXRD->isDynamicClass()) { + NeededInt = NeededSSE = 0; + return getIndirectReturnResult(Ty); + } + + for (const auto &I : CXXRD->bases()) + if (classifyRegCallStructTypeImpl(I.getType(), NeededInt, NeededSSE, + MaxVectorWidth) + .isIndirect()) { + NeededInt = NeededSSE = 0; + return getIndirectReturnResult(Ty); + } + } + + // Sum up members + for (const auto *FD : RT->getDecl()->fields()) { + QualType MTy = FD->getType(); + if (MTy->isRecordType() && !MTy->isUnionType()) { + if (classifyRegCallStructTypeImpl(MTy, NeededInt, NeededSSE, + MaxVectorWidth) + .isIndirect()) { + NeededInt = NeededSSE = 0; + return getIndirectReturnResult(Ty); + } + } else { + unsigned LocalNeededInt, LocalNeededSSE; + if (classifyArgumentType(MTy, UINT_MAX, LocalNeededInt, LocalNeededSSE, + true, true) + .isIndirect()) { + NeededInt = NeededSSE = 0; + return getIndirectReturnResult(Ty); + } + if (const auto *AT = getContext().getAsConstantArrayType(MTy)) + MTy = AT->getElementType(); + if (const auto *VT = MTy->getAs()) + if (getContext().getTypeSize(VT) > MaxVectorWidth) + MaxVectorWidth = getContext().getTypeSize(VT); + NeededInt += LocalNeededInt; + NeededSSE += LocalNeededSSE; + } + } + + return ABIArgInfo::getDirect(); +} + +ABIArgInfo +X86_64ABIInfo::classifyRegCallStructType(QualType Ty, unsigned &NeededInt, + unsigned &NeededSSE, + unsigned &MaxVectorWidth) const { + + NeededInt = 0; + NeededSSE = 0; + MaxVectorWidth = 0; + + return classifyRegCallStructTypeImpl(Ty, NeededInt, NeededSSE, + MaxVectorWidth); +} + +void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const { + + const unsigned CallingConv = FI.getCallingConvention(); + // It is possible to force Win64 calling convention on any x86_64 target by + // using __attribute__((ms_abi)). In such case to correctly emit Win64 + // compatible code delegate this call to WinX86_64ABIInfo::computeInfo. + if (CallingConv == llvm::CallingConv::Win64) { + WinX86_64ABIInfo Win64ABIInfo(CGT, AVXLevel); + Win64ABIInfo.computeInfo(FI); + return; + } + + bool IsRegCall = CallingConv == llvm::CallingConv::X86_RegCall; + + // Keep track of the number of assigned registers. + unsigned FreeIntRegs = IsRegCall ? 11 : 6; + unsigned FreeSSERegs = IsRegCall ? 16 : 8; + unsigned NeededInt = 0, NeededSSE = 0, MaxVectorWidth = 0; + + if (!::classifyReturnType(getCXXABI(), FI, *this)) { + if (IsRegCall && FI.getReturnType()->getTypePtr()->isRecordType() && + !FI.getReturnType()->getTypePtr()->isUnionType()) { + FI.getReturnInfo() = classifyRegCallStructType( + FI.getReturnType(), NeededInt, NeededSSE, MaxVectorWidth); + if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) { + FreeIntRegs -= NeededInt; + FreeSSERegs -= NeededSSE; + } else { + FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType()); + } + } else if (IsRegCall && FI.getReturnType()->getAs() && + getContext().getCanonicalType(FI.getReturnType() + ->getAs() + ->getElementType()) == + getContext().LongDoubleTy) + // Complex Long Double Type is passed in Memory when Regcall + // calling convention is used. + FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType()); + else + FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); + } + + // If the return value is indirect, then the hidden argument is consuming one + // integer register. + if (FI.getReturnInfo().isIndirect()) + --FreeIntRegs; + else if (NeededSSE && MaxVectorWidth > 0) + FI.setMaxVectorWidth(MaxVectorWidth); + + // The chain argument effectively gives us another free register. + if (FI.isChainCall()) + ++FreeIntRegs; + + unsigned NumRequiredArgs = FI.getNumRequiredArgs(); + // AMD64-ABI 3.2.3p3: Once arguments are classified, the registers + // get assigned (in left-to-right order) for passing as follows... + unsigned ArgNo = 0; + for (CGFunctionInfo::arg_iterator it = FI.arg_begin(), ie = FI.arg_end(); + it != ie; ++it, ++ArgNo) { + bool IsNamedArg = ArgNo < NumRequiredArgs; + + if (IsRegCall && it->type->isStructureOrClassType()) + it->info = classifyRegCallStructType(it->type, NeededInt, NeededSSE, + MaxVectorWidth); + else + it->info = classifyArgumentType(it->type, FreeIntRegs, NeededInt, + NeededSSE, IsNamedArg); + + // AMD64-ABI 3.2.3p3: If there are no registers available for any + // eightbyte of an argument, the whole argument is passed on the + // stack. If registers have already been assigned for some + // eightbytes of such an argument, the assignments get reverted. + if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) { + FreeIntRegs -= NeededInt; + FreeSSERegs -= NeededSSE; + if (MaxVectorWidth > FI.getMaxVectorWidth()) + FI.setMaxVectorWidth(MaxVectorWidth); + } else { + it->info = getIndirectResult(it->type, FreeIntRegs); + } + } +} + +static Address EmitX86_64VAArgFromMemory(CodeGenFunction &CGF, + Address VAListAddr, QualType Ty) { + Address overflow_arg_area_p = + CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_p"); + llvm::Value *overflow_arg_area = + CGF.Builder.CreateLoad(overflow_arg_area_p, "overflow_arg_area"); + + // AMD64-ABI 3.5.7p5: Step 7. Align l->overflow_arg_area upwards to a 16 + // byte boundary if alignment needed by type exceeds 8 byte boundary. + // It isn't stated explicitly in the standard, but in practice we use + // alignment greater than 16 where necessary. + CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty); + if (Align > CharUnits::fromQuantity(8)) { + overflow_arg_area = emitRoundPointerUpToAlignment(CGF, overflow_arg_area, + Align); + } + + // AMD64-ABI 3.5.7p5: Step 8. Fetch type from l->overflow_arg_area. + llvm::Type *LTy = CGF.ConvertTypeForMem(Ty); + llvm::Value *Res = + CGF.Builder.CreateBitCast(overflow_arg_area, + llvm::PointerType::getUnqual(LTy)); + + // AMD64-ABI 3.5.7p5: Step 9. Set l->overflow_arg_area to: + // l->overflow_arg_area + sizeof(type). + // AMD64-ABI 3.5.7p5: Step 10. Align l->overflow_arg_area upwards to + // an 8 byte boundary. + + uint64_t SizeInBytes = (CGF.getContext().getTypeSize(Ty) + 7) / 8; + llvm::Value *Offset = + llvm::ConstantInt::get(CGF.Int32Ty, (SizeInBytes + 7) & ~7); + overflow_arg_area = CGF.Builder.CreateGEP(CGF.Int8Ty, overflow_arg_area, + Offset, "overflow_arg_area.next"); + CGF.Builder.CreateStore(overflow_arg_area, overflow_arg_area_p); + + // AMD64-ABI 3.5.7p5: Step 11. Return the fetched type. + return Address(Res, LTy, Align); +} + +Address X86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + // Assume that va_list type is correct; should be pointer to LLVM type: + // struct { + // i32 gp_offset; + // i32 fp_offset; + // i8* overflow_arg_area; + // i8* reg_save_area; + // }; + unsigned neededInt, neededSSE; + + Ty = getContext().getCanonicalType(Ty); + ABIArgInfo AI = classifyArgumentType(Ty, 0, neededInt, neededSSE, + /*isNamedArg*/false); + + // AMD64-ABI 3.5.7p5: Step 1. Determine whether type may be passed + // in the registers. If not go to step 7. + if (!neededInt && !neededSSE) + return EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty); + + // AMD64-ABI 3.5.7p5: Step 2. Compute num_gp to hold the number of + // general purpose registers needed to pass type and num_fp to hold + // the number of floating point registers needed. + + // AMD64-ABI 3.5.7p5: Step 3. Verify whether arguments fit into + // registers. In the case: l->gp_offset > 48 - num_gp * 8 or + // l->fp_offset > 304 - num_fp * 16 go to step 7. + // + // NOTE: 304 is a typo, there are (6 * 8 + 8 * 16) = 176 bytes of + // register save space). + + llvm::Value *InRegs = nullptr; + Address gp_offset_p = Address::invalid(), fp_offset_p = Address::invalid(); + llvm::Value *gp_offset = nullptr, *fp_offset = nullptr; + if (neededInt) { + gp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "gp_offset_p"); + gp_offset = CGF.Builder.CreateLoad(gp_offset_p, "gp_offset"); + InRegs = llvm::ConstantInt::get(CGF.Int32Ty, 48 - neededInt * 8); + InRegs = CGF.Builder.CreateICmpULE(gp_offset, InRegs, "fits_in_gp"); + } + + if (neededSSE) { + fp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 1, "fp_offset_p"); + fp_offset = CGF.Builder.CreateLoad(fp_offset_p, "fp_offset"); + llvm::Value *FitsInFP = + llvm::ConstantInt::get(CGF.Int32Ty, 176 - neededSSE * 16); + FitsInFP = CGF.Builder.CreateICmpULE(fp_offset, FitsInFP, "fits_in_fp"); + InRegs = InRegs ? CGF.Builder.CreateAnd(InRegs, FitsInFP) : FitsInFP; + } + + llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg"); + llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem"); + llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end"); + CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock); + + // Emit code to load the value if it was passed in registers. + + CGF.EmitBlock(InRegBlock); + + // AMD64-ABI 3.5.7p5: Step 4. Fetch type from l->reg_save_area with + // an offset of l->gp_offset and/or l->fp_offset. This may require + // copying to a temporary location in case the parameter is passed + // in different register classes or requires an alignment greater + // than 8 for general purpose registers and 16 for XMM registers. + // + // FIXME: This really results in shameful code when we end up needing to + // collect arguments from different places; often what should result in a + // simple assembling of a structure from scattered addresses has many more + // loads than necessary. Can we clean this up? + llvm::Type *LTy = CGF.ConvertTypeForMem(Ty); + llvm::Value *RegSaveArea = CGF.Builder.CreateLoad( + CGF.Builder.CreateStructGEP(VAListAddr, 3), "reg_save_area"); + + Address RegAddr = Address::invalid(); + if (neededInt && neededSSE) { + // FIXME: Cleanup. + assert(AI.isDirect() && "Unexpected ABI info for mixed regs"); + llvm::StructType *ST = cast(AI.getCoerceToType()); + Address Tmp = CGF.CreateMemTemp(Ty); + Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST); + assert(ST->getNumElements() == 2 && "Unexpected ABI info for mixed regs"); + llvm::Type *TyLo = ST->getElementType(0); + llvm::Type *TyHi = ST->getElementType(1); + assert((TyLo->isFPOrFPVectorTy() ^ TyHi->isFPOrFPVectorTy()) && + "Unexpected ABI info for mixed regs"); + llvm::Type *PTyLo = llvm::PointerType::getUnqual(TyLo); + llvm::Type *PTyHi = llvm::PointerType::getUnqual(TyHi); + llvm::Value *GPAddr = + CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset); + llvm::Value *FPAddr = + CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset); + llvm::Value *RegLoAddr = TyLo->isFPOrFPVectorTy() ? FPAddr : GPAddr; + llvm::Value *RegHiAddr = TyLo->isFPOrFPVectorTy() ? GPAddr : FPAddr; + + // Copy the first element. + // FIXME: Our choice of alignment here and below is probably pessimistic. + llvm::Value *V = CGF.Builder.CreateAlignedLoad( + TyLo, CGF.Builder.CreateBitCast(RegLoAddr, PTyLo), + CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyLo))); + CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0)); + + // Copy the second element. + V = CGF.Builder.CreateAlignedLoad( + TyHi, CGF.Builder.CreateBitCast(RegHiAddr, PTyHi), + CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyHi))); + CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1)); + + RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy); + } else if (neededInt) { + RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset), + CGF.Int8Ty, CharUnits::fromQuantity(8)); + RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy); + + // Copy to a temporary if necessary to ensure the appropriate alignment. + auto TInfo = getContext().getTypeInfoInChars(Ty); + uint64_t TySize = TInfo.Width.getQuantity(); + CharUnits TyAlign = TInfo.Align; + + // Copy into a temporary if the type is more aligned than the + // register save area. + if (TyAlign.getQuantity() > 8) { + Address Tmp = CGF.CreateMemTemp(Ty); + CGF.Builder.CreateMemCpy(Tmp, RegAddr, TySize, false); + RegAddr = Tmp; + } + + } else if (neededSSE == 1) { + RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset), + CGF.Int8Ty, CharUnits::fromQuantity(16)); + RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy); + } else { + assert(neededSSE == 2 && "Invalid number of needed registers!"); + // SSE registers are spaced 16 bytes apart in the register save + // area, we need to collect the two eightbytes together. + // The ABI isn't explicit about this, but it seems reasonable + // to assume that the slots are 16-byte aligned, since the stack is + // naturally 16-byte aligned and the prologue is expected to store + // all the SSE registers to the RSA. + Address RegAddrLo = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, + fp_offset), + CGF.Int8Ty, CharUnits::fromQuantity(16)); + Address RegAddrHi = + CGF.Builder.CreateConstInBoundsByteGEP(RegAddrLo, + CharUnits::fromQuantity(16)); + llvm::Type *ST = AI.canHaveCoerceToType() + ? AI.getCoerceToType() + : llvm::StructType::get(CGF.DoubleTy, CGF.DoubleTy); + llvm::Value *V; + Address Tmp = CGF.CreateMemTemp(Ty); + Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST); + V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast( + RegAddrLo, ST->getStructElementType(0))); + CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0)); + V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast( + RegAddrHi, ST->getStructElementType(1))); + CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1)); + + RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy); + } + + // AMD64-ABI 3.5.7p5: Step 5. Set: + // l->gp_offset = l->gp_offset + num_gp * 8 + // l->fp_offset = l->fp_offset + num_fp * 16. + if (neededInt) { + llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededInt * 8); + CGF.Builder.CreateStore(CGF.Builder.CreateAdd(gp_offset, Offset), + gp_offset_p); + } + if (neededSSE) { + llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededSSE * 16); + CGF.Builder.CreateStore(CGF.Builder.CreateAdd(fp_offset, Offset), + fp_offset_p); + } + CGF.EmitBranch(ContBlock); + + // Emit code to load the value if it was passed in memory. + + CGF.EmitBlock(InMemBlock); + Address MemAddr = EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty); + + // Return the appropriate result. + + CGF.EmitBlock(ContBlock); + Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock, + "vaarg.addr"); + return ResAddr; +} + +Address X86_64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is + // not 1, 2, 4, or 8 bytes, must be passed by reference." + uint64_t Width = getContext().getTypeSize(Ty); + bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width); + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, + CGF.getContext().getTypeInfoInChars(Ty), + CharUnits::fromQuantity(8), + /*allowHigherAlign*/ false); +} + +ABIArgInfo WinX86_64ABIInfo::reclassifyHvaArgForVectorCall( + QualType Ty, unsigned &FreeSSERegs, const ABIArgInfo ¤t) const { + const Type *Base = nullptr; + uint64_t NumElts = 0; + + if (!Ty->isBuiltinType() && !Ty->isVectorType() && + isHomogeneousAggregate(Ty, Base, NumElts) && FreeSSERegs >= NumElts) { + FreeSSERegs -= NumElts; + return getDirectX86Hva(); + } + return current; +} + +ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty, unsigned &FreeSSERegs, + bool IsReturnType, bool IsVectorCall, + bool IsRegCall) const { + + if (Ty->isVoidType()) + return ABIArgInfo::getIgnore(); + + if (const EnumType *EnumTy = Ty->getAs()) + Ty = EnumTy->getDecl()->getIntegerType(); + + TypeInfo Info = getContext().getTypeInfo(Ty); + uint64_t Width = Info.Width; + CharUnits Align = getContext().toCharUnitsFromBits(Info.Align); + + const RecordType *RT = Ty->getAs(); + if (RT) { + if (!IsReturnType) { + if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI())) + return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); + } + + if (RT->getDecl()->hasFlexibleArrayMember()) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + + } + + const Type *Base = nullptr; + uint64_t NumElts = 0; + // vectorcall adds the concept of a homogenous vector aggregate, similar to + // other targets. + if ((IsVectorCall || IsRegCall) && + isHomogeneousAggregate(Ty, Base, NumElts)) { + if (IsRegCall) { + if (FreeSSERegs >= NumElts) { + FreeSSERegs -= NumElts; + if (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType()) + return ABIArgInfo::getDirect(); + return ABIArgInfo::getExpand(); + } + return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); + } else if (IsVectorCall) { + if (FreeSSERegs >= NumElts && + (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType())) { + FreeSSERegs -= NumElts; + return ABIArgInfo::getDirect(); + } else if (IsReturnType) { + return ABIArgInfo::getExpand(); + } else if (!Ty->isBuiltinType() && !Ty->isVectorType()) { + // HVAs are delayed and reclassified in the 2nd step. + return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); + } + } + } + + if (Ty->isMemberPointerType()) { + // If the member pointer is represented by an LLVM int or ptr, pass it + // directly. + llvm::Type *LLTy = CGT.ConvertType(Ty); + if (LLTy->isPointerTy() || LLTy->isIntegerTy()) + return ABIArgInfo::getDirect(); + } + + if (RT || Ty->isAnyComplexType() || Ty->isMemberPointerType()) { + // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is + // not 1, 2, 4, or 8 bytes, must be passed by reference." + if (Width > 64 || !llvm::isPowerOf2_64(Width)) + return getNaturalAlignIndirect(Ty, /*ByVal=*/false); + + // Otherwise, coerce it to a small integer. + return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Width)); + } + + if (const BuiltinType *BT = Ty->getAs()) { + switch (BT->getKind()) { + case BuiltinType::Bool: + // Bool type is always extended to the ABI, other builtin types are not + // extended. + return ABIArgInfo::getExtend(Ty); + + case BuiltinType::LongDouble: + // Mingw64 GCC uses the old 80 bit extended precision floating point + // unit. It passes them indirectly through memory. + if (IsMingw64) { + const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat(); + if (LDF == &llvm::APFloat::x87DoubleExtended()) + return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); + } + break; + + case BuiltinType::Int128: + case BuiltinType::UInt128: + // If it's a parameter type, the normal ABI rule is that arguments larger + // than 8 bytes are passed indirectly. GCC follows it. We follow it too, + // even though it isn't particularly efficient. + if (!IsReturnType) + return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); + + // Mingw64 GCC returns i128 in XMM0. Coerce to v2i64 to handle that. + // Clang matches them for compatibility. + return ABIArgInfo::getDirect(llvm::FixedVectorType::get( + llvm::Type::getInt64Ty(getVMContext()), 2)); + + default: + break; + } + } + + if (Ty->isBitIntType()) { + // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is + // not 1, 2, 4, or 8 bytes, must be passed by reference." + // However, non-power-of-two bit-precise integers will be passed as 1, 2, 4, + // or 8 bytes anyway as long is it fits in them, so we don't have to check + // the power of 2. + if (Width <= 64) + return ABIArgInfo::getDirect(); + return ABIArgInfo::getIndirect(Align, /*ByVal=*/false); + } + + return ABIArgInfo::getDirect(); +} + +void WinX86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const { + const unsigned CC = FI.getCallingConvention(); + bool IsVectorCall = CC == llvm::CallingConv::X86_VectorCall; + bool IsRegCall = CC == llvm::CallingConv::X86_RegCall; + + // If __attribute__((sysv_abi)) is in use, use the SysV argument + // classification rules. + if (CC == llvm::CallingConv::X86_64_SysV) { + X86_64ABIInfo SysVABIInfo(CGT, AVXLevel); + SysVABIInfo.computeInfo(FI); + return; + } + + unsigned FreeSSERegs = 0; + if (IsVectorCall) { + // We can use up to 4 SSE return registers with vectorcall. + FreeSSERegs = 4; + } else if (IsRegCall) { + // RegCall gives us 16 SSE registers. + FreeSSERegs = 16; + } + + if (!getCXXABI().classifyReturnType(FI)) + FI.getReturnInfo() = classify(FI.getReturnType(), FreeSSERegs, true, + IsVectorCall, IsRegCall); + + if (IsVectorCall) { + // We can use up to 6 SSE register parameters with vectorcall. + FreeSSERegs = 6; + } else if (IsRegCall) { + // RegCall gives us 16 SSE registers, we can reuse the return registers. + FreeSSERegs = 16; + } + + unsigned ArgNum = 0; + unsigned ZeroSSERegs = 0; + for (auto &I : FI.arguments()) { + // Vectorcall in x64 only permits the first 6 arguments to be passed as + // XMM/YMM registers. After the sixth argument, pretend no vector + // registers are left. + unsigned *MaybeFreeSSERegs = + (IsVectorCall && ArgNum >= 6) ? &ZeroSSERegs : &FreeSSERegs; + I.info = + classify(I.type, *MaybeFreeSSERegs, false, IsVectorCall, IsRegCall); + ++ArgNum; + } + + if (IsVectorCall) { + // For vectorcall, assign aggregate HVAs to any free vector registers in a + // second pass. + for (auto &I : FI.arguments()) + I.info = reclassifyHvaArgForVectorCall(I.type, FreeSSERegs, I.info); + } +} + +Address WinX86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is + // not 1, 2, 4, or 8 bytes, must be passed by reference." + uint64_t Width = getContext().getTypeSize(Ty); + bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width); + + return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, + CGF.getContext().getTypeInfoInChars(Ty), + CharUnits::fromQuantity(8), + /*allowHigherAlign*/ false); +} + +std::unique_ptr CodeGen::createX86_32TargetCodeGenInfo( + CodeGenModule &CGM, bool DarwinVectorABI, bool Win32StructABI, + unsigned NumRegisterParameters, bool SoftFloatABI) { + bool RetSmallStructInRegABI = X86_32TargetCodeGenInfo::isStructReturnInRegABI( + CGM.getTriple(), CGM.getCodeGenOpts()); + return std::make_unique( + CGM.getTypes(), DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI, + NumRegisterParameters, SoftFloatABI); +} + +std::unique_ptr CodeGen::createWinX86_32TargetCodeGenInfo( + CodeGenModule &CGM, bool DarwinVectorABI, bool Win32StructABI, + unsigned NumRegisterParameters) { + bool RetSmallStructInRegABI = X86_32TargetCodeGenInfo::isStructReturnInRegABI( + CGM.getTriple(), CGM.getCodeGenOpts()); + return std::make_unique( + CGM.getTypes(), DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI, + NumRegisterParameters); +} + +std::unique_ptr +CodeGen::createX86_64TargetCodeGenInfo(CodeGenModule &CGM, + X86AVXABILevel AVXLevel) { + return std::make_unique(CGM.getTypes(), AVXLevel); +} + +std::unique_ptr +CodeGen::createWinX86_64TargetCodeGenInfo(CodeGenModule &CGM, + X86AVXABILevel AVXLevel) { + return std::make_unique(CGM.getTypes(), AVXLevel); +} diff --git a/clang/lib/CodeGen/Targets/XCore.cpp b/clang/lib/CodeGen/Targets/XCore.cpp new file mode 100644 --- /dev/null +++ b/clang/lib/CodeGen/Targets/XCore.cpp @@ -0,0 +1,662 @@ +//===- XCore.cpp ----------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABIInfoImpl.h" +#include "TargetInfo.h" + +using namespace clang; +using namespace clang::CodeGen; + +//===----------------------------------------------------------------------===// +// XCore ABI Implementation +//===----------------------------------------------------------------------===// + +namespace { + +/// A SmallStringEnc instance is used to build up the TypeString by passing +/// it by reference between functions that append to it. +typedef llvm::SmallString<128> SmallStringEnc; + +/// TypeStringCache caches the meta encodings of Types. +/// +/// The reason for caching TypeStrings is two fold: +/// 1. To cache a type's encoding for later uses; +/// 2. As a means to break recursive member type inclusion. +/// +/// A cache Entry can have a Status of: +/// NonRecursive: The type encoding is not recursive; +/// Recursive: The type encoding is recursive; +/// Incomplete: An incomplete TypeString; +/// IncompleteUsed: An incomplete TypeString that has been used in a +/// Recursive type encoding. +/// +/// A NonRecursive entry will have all of its sub-members expanded as fully +/// as possible. Whilst it may contain types which are recursive, the type +/// itself is not recursive and thus its encoding may be safely used whenever +/// the type is encountered. +/// +/// A Recursive entry will have all of its sub-members expanded as fully as +/// possible. The type itself is recursive and it may contain other types which +/// are recursive. The Recursive encoding must not be used during the expansion +/// of a recursive type's recursive branch. For simplicity the code uses +/// IncompleteCount to reject all usage of Recursive encodings for member types. +/// +/// An Incomplete entry is always a RecordType and only encodes its +/// identifier e.g. "s(S){}". Incomplete 'StubEnc' entries are ephemeral and +/// are placed into the cache during type expansion as a means to identify and +/// handle recursive inclusion of types as sub-members. If there is recursion +/// the entry becomes IncompleteUsed. +/// +/// During the expansion of a RecordType's members: +/// +/// If the cache contains a NonRecursive encoding for the member type, the +/// cached encoding is used; +/// +/// If the cache contains a Recursive encoding for the member type, the +/// cached encoding is 'Swapped' out, as it may be incorrect, and... +/// +/// If the member is a RecordType, an Incomplete encoding is placed into the +/// cache to break potential recursive inclusion of itself as a sub-member; +/// +/// Once a member RecordType has been expanded, its temporary incomplete +/// entry is removed from the cache. If a Recursive encoding was swapped out +/// it is swapped back in; +/// +/// If an incomplete entry is used to expand a sub-member, the incomplete +/// entry is marked as IncompleteUsed. The cache keeps count of how many +/// IncompleteUsed entries it currently contains in IncompleteUsedCount; +/// +/// If a member's encoding is found to be a NonRecursive or Recursive viz: +/// IncompleteUsedCount==0, the member's encoding is added to the cache. +/// Else the member is part of a recursive type and thus the recursion has +/// been exited too soon for the encoding to be correct for the member. +/// +class TypeStringCache { + enum Status {NonRecursive, Recursive, Incomplete, IncompleteUsed}; + struct Entry { + std::string Str; // The encoded TypeString for the type. + enum Status State; // Information about the encoding in 'Str'. + std::string Swapped; // A temporary place holder for a Recursive encoding + // during the expansion of RecordType's members. + }; + std::map Map; + unsigned IncompleteCount; // Number of Incomplete entries in the Map. + unsigned IncompleteUsedCount; // Number of IncompleteUsed entries in the Map. +public: + TypeStringCache() : IncompleteCount(0), IncompleteUsedCount(0) {} + void addIncomplete(const IdentifierInfo *ID, std::string StubEnc); + bool removeIncomplete(const IdentifierInfo *ID); + void addIfComplete(const IdentifierInfo *ID, StringRef Str, + bool IsRecursive); + StringRef lookupStr(const IdentifierInfo *ID); +}; + +/// TypeString encodings for enum & union fields must be order. +/// FieldEncoding is a helper for this ordering process. +class FieldEncoding { + bool HasName; + std::string Enc; +public: + FieldEncoding(bool b, SmallStringEnc &e) : HasName(b), Enc(e.c_str()) {} + StringRef str() { return Enc; } + bool operator<(const FieldEncoding &rhs) const { + if (HasName != rhs.HasName) return HasName; + return Enc < rhs.Enc; + } +}; + +class XCoreABIInfo : public DefaultABIInfo { +public: + XCoreABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} + Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const override; +}; + +class XCoreTargetCodeGenInfo : public TargetCodeGenInfo { + mutable TypeStringCache TSC; + void emitTargetMD(const Decl *D, llvm::GlobalValue *GV, + const CodeGen::CodeGenModule &M) const; + +public: + XCoreTargetCodeGenInfo(CodeGenTypes &CGT) + : TargetCodeGenInfo(std::make_unique(CGT)) {} + void emitTargetMetadata(CodeGen::CodeGenModule &CGM, + const llvm::MapVector + &MangledDeclNames) const override; +}; + +} // End anonymous namespace. + +// TODO: this implementation is likely now redundant with the default +// EmitVAArg. +Address XCoreABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, + QualType Ty) const { + CGBuilderTy &Builder = CGF.Builder; + + // Get the VAList. + CharUnits SlotSize = CharUnits::fromQuantity(4); + Address AP = Address(Builder.CreateLoad(VAListAddr), + getVAListElementType(CGF), SlotSize); + + // Handle the argument. + ABIArgInfo AI = classifyArgumentType(Ty); + CharUnits TypeAlign = getContext().getTypeAlignInChars(Ty); + llvm::Type *ArgTy = CGT.ConvertType(Ty); + if (AI.canHaveCoerceToType() && !AI.getCoerceToType()) + AI.setCoerceToType(ArgTy); + llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy); + + Address Val = Address::invalid(); + CharUnits ArgSize = CharUnits::Zero(); + switch (AI.getKind()) { + case ABIArgInfo::Expand: + case ABIArgInfo::CoerceAndExpand: + case ABIArgInfo::InAlloca: + llvm_unreachable("Unsupported ABI kind for va_arg"); + case ABIArgInfo::Ignore: + Val = Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeAlign); + ArgSize = CharUnits::Zero(); + break; + case ABIArgInfo::Extend: + case ABIArgInfo::Direct: + Val = Builder.CreateElementBitCast(AP, ArgTy); + ArgSize = CharUnits::fromQuantity( + getDataLayout().getTypeAllocSize(AI.getCoerceToType())); + ArgSize = ArgSize.alignTo(SlotSize); + break; + case ABIArgInfo::Indirect: + case ABIArgInfo::IndirectAliased: + Val = Builder.CreateElementBitCast(AP, ArgPtrTy); + Val = Address(Builder.CreateLoad(Val), ArgTy, TypeAlign); + ArgSize = SlotSize; + break; + } + + // Increment the VAList. + if (!ArgSize.isZero()) { + Address APN = Builder.CreateConstInBoundsByteGEP(AP, ArgSize); + Builder.CreateStore(APN.getPointer(), VAListAddr); + } + + return Val; +} + +/// During the expansion of a RecordType, an incomplete TypeString is placed +/// into the cache as a means to identify and break recursion. +/// If there is a Recursive encoding in the cache, it is swapped out and will +/// be reinserted by removeIncomplete(). +/// All other types of encoding should have been used rather than arriving here. +void TypeStringCache::addIncomplete(const IdentifierInfo *ID, + std::string StubEnc) { + if (!ID) + return; + Entry &E = Map[ID]; + assert( (E.Str.empty() || E.State == Recursive) && + "Incorrectly use of addIncomplete"); + assert(!StubEnc.empty() && "Passing an empty string to addIncomplete()"); + E.Swapped.swap(E.Str); // swap out the Recursive + E.Str.swap(StubEnc); + E.State = Incomplete; + ++IncompleteCount; +} + +/// Once the RecordType has been expanded, the temporary incomplete TypeString +/// must be removed from the cache. +/// If a Recursive was swapped out by addIncomplete(), it will be replaced. +/// Returns true if the RecordType was defined recursively. +bool TypeStringCache::removeIncomplete(const IdentifierInfo *ID) { + if (!ID) + return false; + auto I = Map.find(ID); + assert(I != Map.end() && "Entry not present"); + Entry &E = I->second; + assert( (E.State == Incomplete || + E.State == IncompleteUsed) && + "Entry must be an incomplete type"); + bool IsRecursive = false; + if (E.State == IncompleteUsed) { + // We made use of our Incomplete encoding, thus we are recursive. + IsRecursive = true; + --IncompleteUsedCount; + } + if (E.Swapped.empty()) + Map.erase(I); + else { + // Swap the Recursive back. + E.Swapped.swap(E.Str); + E.Swapped.clear(); + E.State = Recursive; + } + --IncompleteCount; + return IsRecursive; +} + +/// Add the encoded TypeString to the cache only if it is NonRecursive or +/// Recursive (viz: all sub-members were expanded as fully as possible). +void TypeStringCache::addIfComplete(const IdentifierInfo *ID, StringRef Str, + bool IsRecursive) { + if (!ID || IncompleteUsedCount) + return; // No key or it is an incomplete sub-type so don't add. + Entry &E = Map[ID]; + if (IsRecursive && !E.Str.empty()) { + assert(E.State==Recursive && E.Str.size() == Str.size() && + "This is not the same Recursive entry"); + // The parent container was not recursive after all, so we could have used + // this Recursive sub-member entry after all, but we assumed the worse when + // we started viz: IncompleteCount!=0. + return; + } + assert(E.Str.empty() && "Entry already present"); + E.Str = Str.str(); + E.State = IsRecursive? Recursive : NonRecursive; +} + +/// Return a cached TypeString encoding for the ID. If there isn't one, or we +/// are recursively expanding a type (IncompleteCount != 0) and the cached +/// encoding is Recursive, return an empty StringRef. +StringRef TypeStringCache::lookupStr(const IdentifierInfo *ID) { + if (!ID) + return StringRef(); // We have no key. + auto I = Map.find(ID); + if (I == Map.end()) + return StringRef(); // We have no encoding. + Entry &E = I->second; + if (E.State == Recursive && IncompleteCount) + return StringRef(); // We don't use Recursive encodings for member types. + + if (E.State == Incomplete) { + // The incomplete type is being used to break out of recursion. + E.State = IncompleteUsed; + ++IncompleteUsedCount; + } + return E.Str; +} + +/// The XCore ABI includes a type information section that communicates symbol +/// type information to the linker. The linker uses this information to verify +/// safety/correctness of things such as array bound and pointers et al. +/// The ABI only requires C (and XC) language modules to emit TypeStrings. +/// This type information (TypeString) is emitted into meta data for all global +/// symbols: definitions, declarations, functions & variables. +/// +/// The TypeString carries type, qualifier, name, size & value details. +/// Please see 'Tools Development Guide' section 2.16.2 for format details: +/// https://www.xmos.com/download/public/Tools-Development-Guide%28X9114A%29.pdf +/// The output is tested by test/CodeGen/xcore-stringtype.c. +/// +static bool getTypeString(SmallStringEnc &Enc, const Decl *D, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC); + +/// XCore uses emitTargetMD to emit TypeString metadata for global symbols. +void XCoreTargetCodeGenInfo::emitTargetMD( + const Decl *D, llvm::GlobalValue *GV, + const CodeGen::CodeGenModule &CGM) const { + SmallStringEnc Enc; + if (getTypeString(Enc, D, CGM, TSC)) { + llvm::LLVMContext &Ctx = CGM.getModule().getContext(); + llvm::Metadata *MDVals[] = {llvm::ConstantAsMetadata::get(GV), + llvm::MDString::get(Ctx, Enc.str())}; + llvm::NamedMDNode *MD = + CGM.getModule().getOrInsertNamedMetadata("xcore.typestrings"); + MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); + } +} + +void XCoreTargetCodeGenInfo::emitTargetMetadata( + CodeGen::CodeGenModule &CGM, + const llvm::MapVector &MangledDeclNames) const { + // Warning, new MangledDeclNames may be appended within this loop. + // We rely on MapVector insertions adding new elements to the end + // of the container. + for (unsigned I = 0; I != MangledDeclNames.size(); ++I) { + auto Val = *(MangledDeclNames.begin() + I); + llvm::GlobalValue *GV = CGM.GetGlobalValue(Val.second); + if (GV) { + const Decl *D = Val.first.getDecl()->getMostRecentDecl(); + emitTargetMD(D, GV, CGM); + } + } +} + +static bool appendType(SmallStringEnc &Enc, QualType QType, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC); + +/// Helper function for appendRecordType(). +/// Builds a SmallVector containing the encoded field types in declaration +/// order. +static bool extractFieldType(SmallVectorImpl &FE, + const RecordDecl *RD, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC) { + for (const auto *Field : RD->fields()) { + SmallStringEnc Enc; + Enc += "m("; + Enc += Field->getName(); + Enc += "){"; + if (Field->isBitField()) { + Enc += "b("; + llvm::raw_svector_ostream OS(Enc); + OS << Field->getBitWidthValue(CGM.getContext()); + Enc += ':'; + } + if (!appendType(Enc, Field->getType(), CGM, TSC)) + return false; + if (Field->isBitField()) + Enc += ')'; + Enc += '}'; + FE.emplace_back(!Field->getName().empty(), Enc); + } + return true; +} + +/// Appends structure and union types to Enc and adds encoding to cache. +/// Recursively calls appendType (via extractFieldType) for each field. +/// Union types have their fields ordered according to the ABI. +static bool appendRecordType(SmallStringEnc &Enc, const RecordType *RT, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC, const IdentifierInfo *ID) { + // Append the cached TypeString if we have one. + StringRef TypeString = TSC.lookupStr(ID); + if (!TypeString.empty()) { + Enc += TypeString; + return true; + } + + // Start to emit an incomplete TypeString. + size_t Start = Enc.size(); + Enc += (RT->isUnionType()? 'u' : 's'); + Enc += '('; + if (ID) + Enc += ID->getName(); + Enc += "){"; + + // We collect all encoded fields and order as necessary. + bool IsRecursive = false; + const RecordDecl *RD = RT->getDecl()->getDefinition(); + if (RD && !RD->field_empty()) { + // An incomplete TypeString stub is placed in the cache for this RecordType + // so that recursive calls to this RecordType will use it whilst building a + // complete TypeString for this RecordType. + SmallVector FE; + std::string StubEnc(Enc.substr(Start).str()); + StubEnc += '}'; // StubEnc now holds a valid incomplete TypeString. + TSC.addIncomplete(ID, std::move(StubEnc)); + if (!extractFieldType(FE, RD, CGM, TSC)) { + (void) TSC.removeIncomplete(ID); + return false; + } + IsRecursive = TSC.removeIncomplete(ID); + // The ABI requires unions to be sorted but not structures. + // See FieldEncoding::operator< for sort algorithm. + if (RT->isUnionType()) + llvm::sort(FE); + // We can now complete the TypeString. + unsigned E = FE.size(); + for (unsigned I = 0; I != E; ++I) { + if (I) + Enc += ','; + Enc += FE[I].str(); + } + } + Enc += '}'; + TSC.addIfComplete(ID, Enc.substr(Start), IsRecursive); + return true; +} + +/// Appends enum types to Enc and adds the encoding to the cache. +static bool appendEnumType(SmallStringEnc &Enc, const EnumType *ET, + TypeStringCache &TSC, + const IdentifierInfo *ID) { + // Append the cached TypeString if we have one. + StringRef TypeString = TSC.lookupStr(ID); + if (!TypeString.empty()) { + Enc += TypeString; + return true; + } + + size_t Start = Enc.size(); + Enc += "e("; + if (ID) + Enc += ID->getName(); + Enc += "){"; + + // We collect all encoded enumerations and order them alphanumerically. + if (const EnumDecl *ED = ET->getDecl()->getDefinition()) { + SmallVector FE; + for (auto I = ED->enumerator_begin(), E = ED->enumerator_end(); I != E; + ++I) { + SmallStringEnc EnumEnc; + EnumEnc += "m("; + EnumEnc += I->getName(); + EnumEnc += "){"; + I->getInitVal().toString(EnumEnc); + EnumEnc += '}'; + FE.push_back(FieldEncoding(!I->getName().empty(), EnumEnc)); + } + llvm::sort(FE); + unsigned E = FE.size(); + for (unsigned I = 0; I != E; ++I) { + if (I) + Enc += ','; + Enc += FE[I].str(); + } + } + Enc += '}'; + TSC.addIfComplete(ID, Enc.substr(Start), false); + return true; +} + +/// Appends type's qualifier to Enc. +/// This is done prior to appending the type's encoding. +static void appendQualifier(SmallStringEnc &Enc, QualType QT) { + // Qualifiers are emitted in alphabetical order. + static const char *const Table[]={"","c:","r:","cr:","v:","cv:","rv:","crv:"}; + int Lookup = 0; + if (QT.isConstQualified()) + Lookup += 1<<0; + if (QT.isRestrictQualified()) + Lookup += 1<<1; + if (QT.isVolatileQualified()) + Lookup += 1<<2; + Enc += Table[Lookup]; +} + +/// Appends built-in types to Enc. +static bool appendBuiltinType(SmallStringEnc &Enc, const BuiltinType *BT) { + const char *EncType; + switch (BT->getKind()) { + case BuiltinType::Void: + EncType = "0"; + break; + case BuiltinType::Bool: + EncType = "b"; + break; + case BuiltinType::Char_U: + EncType = "uc"; + break; + case BuiltinType::UChar: + EncType = "uc"; + break; + case BuiltinType::SChar: + EncType = "sc"; + break; + case BuiltinType::UShort: + EncType = "us"; + break; + case BuiltinType::Short: + EncType = "ss"; + break; + case BuiltinType::UInt: + EncType = "ui"; + break; + case BuiltinType::Int: + EncType = "si"; + break; + case BuiltinType::ULong: + EncType = "ul"; + break; + case BuiltinType::Long: + EncType = "sl"; + break; + case BuiltinType::ULongLong: + EncType = "ull"; + break; + case BuiltinType::LongLong: + EncType = "sll"; + break; + case BuiltinType::Float: + EncType = "ft"; + break; + case BuiltinType::Double: + EncType = "d"; + break; + case BuiltinType::LongDouble: + EncType = "ld"; + break; + default: + return false; + } + Enc += EncType; + return true; +} + +/// Appends a pointer encoding to Enc before calling appendType for the pointee. +static bool appendPointerType(SmallStringEnc &Enc, const PointerType *PT, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC) { + Enc += "p("; + if (!appendType(Enc, PT->getPointeeType(), CGM, TSC)) + return false; + Enc += ')'; + return true; +} + +/// Appends array encoding to Enc before calling appendType for the element. +static bool appendArrayType(SmallStringEnc &Enc, QualType QT, + const ArrayType *AT, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC, StringRef NoSizeEnc) { + if (AT->getSizeModifier() != ArrayType::Normal) + return false; + Enc += "a("; + if (const ConstantArrayType *CAT = dyn_cast(AT)) + CAT->getSize().toStringUnsigned(Enc); + else + Enc += NoSizeEnc; // Global arrays use "*", otherwise it is "". + Enc += ':'; + // The Qualifiers should be attached to the type rather than the array. + appendQualifier(Enc, QT); + if (!appendType(Enc, AT->getElementType(), CGM, TSC)) + return false; + Enc += ')'; + return true; +} + +/// Appends a function encoding to Enc, calling appendType for the return type +/// and the arguments. +static bool appendFunctionType(SmallStringEnc &Enc, const FunctionType *FT, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC) { + Enc += "f{"; + if (!appendType(Enc, FT->getReturnType(), CGM, TSC)) + return false; + Enc += "}("; + if (const FunctionProtoType *FPT = FT->getAs()) { + // N.B. we are only interested in the adjusted param types. + auto I = FPT->param_type_begin(); + auto E = FPT->param_type_end(); + if (I != E) { + do { + if (!appendType(Enc, *I, CGM, TSC)) + return false; + ++I; + if (I != E) + Enc += ','; + } while (I != E); + if (FPT->isVariadic()) + Enc += ",va"; + } else { + if (FPT->isVariadic()) + Enc += "va"; + else + Enc += '0'; + } + } + Enc += ')'; + return true; +} + +/// Handles the type's qualifier before dispatching a call to handle specific +/// type encodings. +static bool appendType(SmallStringEnc &Enc, QualType QType, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC) { + + QualType QT = QType.getCanonicalType(); + + if (const ArrayType *AT = QT->getAsArrayTypeUnsafe()) + // The Qualifiers should be attached to the type rather than the array. + // Thus we don't call appendQualifier() here. + return appendArrayType(Enc, QT, AT, CGM, TSC, ""); + + appendQualifier(Enc, QT); + + if (const BuiltinType *BT = QT->getAs()) + return appendBuiltinType(Enc, BT); + + if (const PointerType *PT = QT->getAs()) + return appendPointerType(Enc, PT, CGM, TSC); + + if (const EnumType *ET = QT->getAs()) + return appendEnumType(Enc, ET, TSC, QT.getBaseTypeIdentifier()); + + if (const RecordType *RT = QT->getAsStructureType()) + return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier()); + + if (const RecordType *RT = QT->getAsUnionType()) + return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier()); + + if (const FunctionType *FT = QT->getAs()) + return appendFunctionType(Enc, FT, CGM, TSC); + + return false; +} + +static bool getTypeString(SmallStringEnc &Enc, const Decl *D, + const CodeGen::CodeGenModule &CGM, + TypeStringCache &TSC) { + if (!D) + return false; + + if (const FunctionDecl *FD = dyn_cast(D)) { + if (FD->getLanguageLinkage() != CLanguageLinkage) + return false; + return appendType(Enc, FD->getType(), CGM, TSC); + } + + if (const VarDecl *VD = dyn_cast(D)) { + if (VD->getLanguageLinkage() != CLanguageLinkage) + return false; + QualType QT = VD->getType().getCanonicalType(); + if (const ArrayType *AT = QT->getAsArrayTypeUnsafe()) { + // Global ArrayTypes are given a size of '*' if the size is unknown. + // The Qualifiers should be attached to the type rather than the array. + // Thus we don't call appendQualifier() here. + return appendArrayType(Enc, QT, AT, CGM, TSC, "*"); + } + return appendType(Enc, QT, CGM, TSC); + } + return false; +} + +std::unique_ptr +CodeGen::createXCoreTargetCodeGenInfo(CodeGenModule &CGM) { + return std::make_unique(CGM.getTypes()); +} diff --git a/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp b/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp --- a/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp +++ b/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp @@ -661,7 +661,7 @@ return static_cast(mp); // FIXME: We should return ptr instead of i32 here. The ptrtoint cast prevents // LLVM from optimizing away the branch. This is likely a bug in -// lib/CodeGen/TargetInfo.cpp with how we classify memptr types for returns. +// lib/CodeGen/Targets/X86.cpp with how we classify memptr types for returns. // // CHECK: define dso_local i32 @"?convertMultipleFuncToB2@@YAP8B2@@AEXXZP8Multiple@@AEXXZ@Z"{{.*}} { // CHECK: store diff --git a/llvm/utils/gn/secondary/clang/lib/CodeGen/BUILD.gn b/llvm/utils/gn/secondary/clang/lib/CodeGen/BUILD.gn --- a/llvm/utils/gn/secondary/clang/lib/CodeGen/BUILD.gn +++ b/llvm/utils/gn/secondary/clang/lib/CodeGen/BUILD.gn @@ -40,6 +40,8 @@ "//llvm/lib/Transforms/Utils", ] sources = [ + "ABIInfo.cpp", + "ABIInfoImpl.cpp", "BackendUtil.cpp", "CGAtomic.cpp", "CGBlocks.cpp", @@ -96,6 +98,31 @@ "SanitizerMetadata.cpp", "SwiftCallingConv.cpp", "TargetInfo.cpp", + "Targets/AArch64.cpp", + "Targets/AMDGPU.cpp", + "Targets/ARC.cpp", + "Targets/ARM.cpp", + "Targets/AVR.cpp", + "Targets/BPF.cpp", + "Targets/CSKY.cpp", + "Targets/Hexagon.cpp", + "Targets/Lanai.cpp", + "Targets/LoongArch.cpp", + "Targets/M68k.cpp", + "Targets/MSP430.cpp", + "Targets/Mips.cpp", + "Targets/NVPTX.cpp", + "Targets/PNaCl.cpp", + "Targets/PPC.cpp", + "Targets/RISCV.cpp", + "Targets/SPIR.cpp", + "Targets/Sparc.cpp", + "Targets/SystemZ.cpp", + "Targets/TCE.cpp", + "Targets/VE.cpp", + "Targets/WebAssembly.cpp", + "Targets/X86.cpp", + "Targets/XCore.cpp", "VarBypassDetector.cpp", ] }