Supress all uses of LLVM_END_WITH_NULL

[serge-sans-paille]

Summary

Use variadic templates instead of relying on <cstdarg> + sentinel.

This enforces better type checking and makes code more readable.

No functional change.

[serge-sans-paille]

Note: I also have a patch to apply to clang because of the API chagne. What's the policy for cross-repo commits?

[serge-sans-paille]

+ remove now useless <cstdarg> includes

[serge-sans-paille]

+ attached clang changes

[mehdi_amini]

In D32541#738248, @serge-sans-paille wrote:

Note: I also have a patch to apply to clang because of the API chagne. What's the policy for cross-repo commits?

Informal Policy is: you should update it, at least when it is about clang (a large part of the CI testing is bootstrapping the compiler).

(Side Note: this setup helps to do it atomically in one review / one commit : http://llvm.org/docs/GettingStarted.html#for-developers-to-work-with-a-git-monorepo )

lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

479

Why do you need the false here?

[serge-sans-paille]

lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

479

That's not related to this commit. the function signature is : `static FunctionType * get (const Type *Result, bool isVarArg)` so passing a casted null pointer was indeed working, but that's not very explicit :-/

[serge-sans-paille]

@mehdi_amini up :-)

[mehdi_amini]

LGTM (provided you build/tested clang)

lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

479

That's not related to this commit.

So commit it separately?
(you don't need a review for that)

[chandlerc]

Forgot about polly which was broken by this. I fixed it in r302618.

[serge-sans-paille]

@chandlerc thanks ! What's the minimal set of dependencies I should have checked in case of such API change?

include/llvm/ADT/STLExtras.h

 };
 
 template <typename T, typename U, typename... Ts>
 struct is_one_of<T, U, Ts...> {
   static const bool value =
       std::is_same<T, U>::value || is_one_of<T, Ts...>::value;
 };
 
+/// \brief traits class for checking whether type T is a base class for all
+///  the given types in the variadic list.
+template <typename T, typename... Ts> struct are_base_of {
+  static const bool value = true;
+};
+
+template <typename T, typename U, typename... Ts>
+struct are_base_of<T, U, Ts...> {
+  static const bool value =
+      std::is_base_of<T, U>::value && are_base_of<T, Ts...>::value;
+};
+
 //===----------------------------------------------------------------------===//
 //     Extra additions for arrays
 //===----------------------------------------------------------------------===//
 
 /// Find the length of an array.
 template <class T, std::size_t N>
 constexpr inline size_t array_lengthof(T (&)[N]) {
   return N;

include/llvm/IR/Constants.h

 #ifndef LLVM_IR_CONSTANTS_H
 #define LLVM_IR_CONSTANTS_H
 
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/IR/Constant.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/OperandTraits.h"
 #include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
class ConstantStruct final : public ConstantAggregate {
   ConstantStruct(StructType *T, ArrayRef<Constant *> Val);
 
   void destroyConstantImpl();
   Value *handleOperandChangeImpl(Value *From, Value *To);
 
 public:
   // ConstantStruct accessors
   static Constant *get(StructType *T, ArrayRef<Constant*> V);
-  static Constant *get(StructType *T, ...) LLVM_END_WITH_NULL;
+
+  template <typename... Csts>
+  static typename std::enable_if<are_base_of<Constant, Csts...>::value,
+                                 Constant *>::type
+  get(StructType *T, Csts *... Vs) {
+    SmallVector<Constant *, 8> Values{{Vs...}};
+    return get(T, Values);
+  }
 
   /// Return an anonymous struct that has the specified elements.
   /// If the struct is possibly empty, then you must specify a context.
   static Constant *getAnon(ArrayRef<Constant*> V, bool Packed = false) {
     return get(getTypeForElements(V, Packed), V);
   }
   static Constant *getAnon(LLVMContext &Ctx,
                            ArrayRef<Constant*> V, bool Packed = false) {

include/llvm/IR/DerivedTypes.h

 // The implementations of these classes live in the Type.cpp file.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_IR_DERIVEDTYPES_H
 #define LLVM_IR_DERIVEDTYPES_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/IR/Type.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
 #include <cassert>
 #include <cstdint>
 
 namespace llvm {
public:
   static StructType *create(LLVMContext &Context);
 
   static StructType *create(ArrayRef<Type *> Elements, StringRef Name,
                             bool isPacked = false);
   static StructType *create(ArrayRef<Type *> Elements);
   static StructType *create(LLVMContext &Context, ArrayRef<Type *> Elements,
                             StringRef Name, bool isPacked = false);
   static StructType *create(LLVMContext &Context, ArrayRef<Type *> Elements);
-  static StructType *create(StringRef Name, Type *elt1, ...) LLVM_END_WITH_NULL;
+  template <class... Tys>
+  static typename std::enable_if<are_base_of<Type, Tys...>::value,
+                                 StructType *>::type
+  create(StringRef Name, Type *elt1, Tys *... elts) {
+    assert(elt1 && "Cannot create a struct type with no elements with this");
+    SmallVector<llvm::Type *, 8> StructFields{{elt1, elts...}};
+    return create(StructFields, Name);
+  }
 
   /// This static method is the primary way to create a literal StructType.
   static StructType *get(LLVMContext &Context, ArrayRef<Type*> Elements,
                          bool isPacked = false);
 
   /// Create an empty structure type.
   static StructType *get(LLVMContext &Context, bool isPacked = false);
 
   /// This static method is a convenience method for creating structure types by
   /// specifying the elements as arguments. Note that this method always returns
   /// a non-packed struct, and requires at least one element type.
-  static StructType *get(Type *elt1, ...) LLVM_END_WITH_NULL;
+  template <class... Tys>
+  static typename std::enable_if<are_base_of<Type, Tys...>::value,
+                                 StructType *>::type
+  get(Type *elt1, Tys *... elts) {
+    assert(elt1 && "Cannot create a struct type with no elements with this");
+    LLVMContext &Ctx = elt1->getContext();
+    SmallVector<llvm::Type *, 8> StructFields{{elt1, elts...}};
+    return llvm::StructType::get(Ctx, StructFields);
+  }
 
   bool isPacked() const { return (getSubclassData() & SCDB_Packed) != 0; }
 
   /// Return true if this type is uniqued by structural equivalence, false if it
   /// is a struct definition.
   bool isLiteral() const { return (getSubclassData() & SCDB_IsLiteral) != 0; }
 
   /// Return true if this is a type with an identity that has no body specified
public:
   StringRef getName() const;
 
   /// Change the name of this type to the specified name, or to a name with a
   /// suffix if there is a collision. Do not call this on an literal type.
   void setName(StringRef Name);
 
   /// Specify a body for an opaque identified type.
   void setBody(ArrayRef<Type*> Elements, bool isPacked = false);
-  void setBody(Type *elt1, ...) LLVM_END_WITH_NULL;
+
+  template <typename... Tys>
+  typename std::enable_if<are_base_of<Type, Tys...>::value, void>::type
+  setBody(Type *elt1, Tys *... elts) {
+    assert(elt1 && "Cannot create a struct type with no elements with this");
+    SmallVector<llvm::Type *, 8> StructFields{{elt1, elts...}};
+    setBody(StructFields);
+  }
 
   /// Return true if the specified type is valid as a element type.
   static bool isValidElementType(Type *ElemTy);
 
   // Iterator access to the elements.
   typedef Type::subtype_iterator element_iterator;
   element_iterator element_begin() const { return ContainedTys; }
   element_iterator element_end() const { return &ContainedTys[NumContainedTys];}

include/llvm/Support/Compiler.h

 #endif
 
 #if defined(__GNUC__)
 #define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
 #else
 #define LLVM_PREFETCH(addr, rw, locality)
 #endif
 
-#if __has_attribute(sentinel) || LLVM_GNUC_PREREQ(3, 0, 0)
-#define LLVM_END_WITH_NULL __attribute__((sentinel))
-#else
-#define LLVM_END_WITH_NULL
-#endif
-
 #if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0)
 #define LLVM_ATTRIBUTE_USED __attribute__((__used__))
 #else
 #define LLVM_ATTRIBUTE_USED
 #endif
 
 /// LLVM_NODISCARD - Warn if a type or return value is discarded.
 #if __cplusplus > 201402L && __has_cpp_attribute(nodiscard)

lib/CodeGen/SjLjEHPrepare.cpp

bool SjLjEHPrepare::doInitialization(Module &M) {
   Type *Int32Ty = Type::getInt32Ty(M.getContext());
   doubleUnderDataTy = ArrayType::get(Int32Ty, 4);
   doubleUnderJBufTy = ArrayType::get(VoidPtrTy, 5);
   FunctionContextTy = StructType::get(VoidPtrTy,         // __prev
                                       Int32Ty,           // call_site
                                       doubleUnderDataTy, // __data
                                       VoidPtrTy,         // __personality
                                       VoidPtrTy,         // __lsda
-                                      doubleUnderJBufTy, // __jbuf
-                                      nullptr);
+                                      doubleUnderJBufTy  // __jbuf
+                                      );
 
   return true;
 }
 
 /// insertCallSiteStore - Insert a store of the call-site value to the
 /// function context
 void SjLjEHPrepare::insertCallSiteStore(Instruction *I, int Number) {
   IRBuilder<> Builder(I);

lib/IR/Constants.cpp

Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
   if (isZero)
     return ConstantAggregateZero::get(ST);
   if (isUndef)
     return UndefValue::get(ST);
 
   return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
 }
 
-Constant *ConstantStruct::get(StructType *T, ...) {
-  va_list ap;
-  SmallVector<Constant*, 8> Values;
-  va_start(ap, T);
-  while (Constant *Val = va_arg(ap, llvm::Constant*))
-    Values.push_back(Val);
-  va_end(ap);
-  return get(T, Values);
-}
-
 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
     : ConstantAggregate(T, ConstantVectorVal, V) {
   assert(V.size() == T->getNumElements() &&
          "Invalid initializer for constant vector");
 }
 
 // ConstantVector accessors.
 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
Constant *GEP = getGetElementPtr(
       Ty, Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
   return getPtrToInt(GEP, 
                      Type::getInt64Ty(Ty->getContext()));
 }
 
 Constant *ConstantExpr::getAlignOf(Type* Ty) {
   // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
   // Note that a non-inbounds gep is used, as null isn't within any object.
-  Type *AligningTy = 
-    StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, nullptr);
+  Type *AligningTy = StructType::get(Type::getInt1Ty(Ty->getContext()), Ty);
   Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo(0));
   Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
   Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
   Constant *Indices[2] = { Zero, One };
   Constant *GEP = getGetElementPtr(AligningTy, NullPtr, Indices);
   return getPtrToInt(GEP,
                      Type::getInt64Ty(Ty->getContext()));
 }

lib/IR/Instructions.cpp

 }
 
 AtomicCmpXchgInst::AtomicCmpXchgInst(Value *Ptr, Value *Cmp, Value *NewVal,
                                      AtomicOrdering SuccessOrdering,
                                      AtomicOrdering FailureOrdering,
                                      SynchronizationScope SynchScope,
                                      Instruction *InsertBefore)
     : Instruction(
-          StructType::get(Cmp->getType(), Type::getInt1Ty(Cmp->getContext()),
-                          nullptr),
+          StructType::get(Cmp->getType(), Type::getInt1Ty(Cmp->getContext())),
           AtomicCmpXchg, OperandTraits<AtomicCmpXchgInst>::op_begin(this),
           OperandTraits<AtomicCmpXchgInst>::operands(this), InsertBefore) {
   Init(Ptr, Cmp, NewVal, SuccessOrdering, FailureOrdering, SynchScope);
 }
 
 AtomicCmpXchgInst::AtomicCmpXchgInst(Value *Ptr, Value *Cmp, Value *NewVal,
                                      AtomicOrdering SuccessOrdering,
                                      AtomicOrdering FailureOrdering,
                                      SynchronizationScope SynchScope,
                                      BasicBlock *InsertAtEnd)
     : Instruction(
-          StructType::get(Cmp->getType(), Type::getInt1Ty(Cmp->getContext()),
-                          nullptr),
+          StructType::get(Cmp->getType(), Type::getInt1Ty(Cmp->getContext())),
           AtomicCmpXchg, OperandTraits<AtomicCmpXchgInst>::op_begin(this),
           OperandTraits<AtomicCmpXchgInst>::operands(this), InsertAtEnd) {
   Init(Ptr, Cmp, NewVal, SuccessOrdering, FailureOrdering, SynchScope);
 }
 
 //===----------------------------------------------------------------------===//
 //                       AtomicRMWInst Implementation
 //===----------------------------------------------------------------------===//

lib/IR/Type.cpp

 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/IR/Type.h"
 #include "LLVMContextImpl.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/IR/Module.h"
 #include <algorithm>
-#include <cstdarg>
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//
 //                         Type Class Implementation
 //===----------------------------------------------------------------------===//
 
 Type *Type::getPrimitiveType(LLVMContext &C, TypeID IDNumber) {
   switch (IDNumber) {
if (!Name.empty())
     ST->setName(Name);
   return ST;
 }
 
 StructType *StructType::get(LLVMContext &Context, bool isPacked) {
   return get(Context, None, isPacked);
 }
 
-StructType *StructType::get(Type *type, ...) {
-  assert(type && "Cannot create a struct type with no elements with this");
-  LLVMContext &Ctx = type->getContext();
-  va_list ap;
-  SmallVector<llvm::Type*, 8> StructFields;
-  va_start(ap, type);
-  while (type) {
-    StructFields.push_back(type);
-    type = va_arg(ap, llvm::Type*);
-  }
-  auto *Ret = llvm::StructType::get(Ctx, StructFields);
-  va_end(ap);
-  return Ret;
-}
-
 StructType *StructType::create(LLVMContext &Context, ArrayRef<Type*> Elements,
                                StringRef Name, bool isPacked) {
   StructType *ST = create(Context, Name);
   ST->setBody(Elements, isPacked);
   return ST;
 }
 
 StructType *StructType::create(LLVMContext &Context, ArrayRef<Type*> Elements) {

 }
 
 StructType *StructType::create(ArrayRef<Type*> Elements) {
   assert(!Elements.empty() &&
          "This method may not be invoked with an empty list");
   return create(Elements[0]->getContext(), Elements, StringRef());
 }
 
-StructType *StructType::create(StringRef Name, Type *type, ...) {
-  assert(type && "Cannot create a struct type with no elements with this");
-  LLVMContext &Ctx = type->getContext();
-  va_list ap;
-  SmallVector<llvm::Type*, 8> StructFields;
-  va_start(ap, type);
-  while (type) {
-    StructFields.push_back(type);
-    type = va_arg(ap, llvm::Type*);
-  }
-  auto *Ret = llvm::StructType::create(Ctx, StructFields, Name);
-  va_end(ap);
-  return Ret;
-}
-
 bool StructType::isSized(SmallPtrSetImpl<Type*> *Visited) const {
   if ((getSubclassData() & SCDB_IsSized) != 0)
     return true;
   if (isOpaque())
     return false;
 
   if (Visited && !Visited->insert(const_cast<StructType*>(this)).second)
     return false;

 
 StringRef StructType::getName() const {
   assert(!isLiteral() && "Literal structs never have names");
   if (!SymbolTableEntry) return StringRef();
 
   return ((StringMapEntry<StructType*> *)SymbolTableEntry)->getKey();
 }
 
-void StructType::setBody(Type *type, ...) {
-  assert(type && "Cannot create a struct type with no elements with this");
-  va_list ap;
-  SmallVector<llvm::Type*, 8> StructFields;
-  va_start(ap, type);
-  while (type) {
-    StructFields.push_back(type);
-    type = va_arg(ap, llvm::Type*);
-  }
-  setBody(StructFields);
-  va_end(ap);
-}
-
 bool StructType::isValidElementType(Type *ElemTy) {
   return !ElemTy->isVoidTy() && !ElemTy->isLabelTy() &&
          !ElemTy->isMetadataTy() && !ElemTy->isFunctionTy() &&
          !ElemTy->isTokenTy();
 }
 
 bool StructType::isLayoutIdentical(StructType *Other) const {
   if (this == Other) return true;

lib/Target/AArch64/AArch64ISelLowering.cpp

SDValue AArch64TargetLowering::LowerFSINCOS(SDValue Op,
   Entry.IsZExt = false;
   Args.push_back(Entry);
 
   const char *LibcallName =
       (ArgVT == MVT::f64) ? "__sincos_stret" : "__sincosf_stret";
   SDValue Callee =
       DAG.getExternalSymbol(LibcallName, getPointerTy(DAG.getDataLayout()));
 
-  StructType *RetTy = StructType::get(ArgTy, ArgTy, nullptr);
+  StructType *RetTy = StructType::get(ArgTy, ArgTy);
   TargetLowering::CallLoweringInfo CLI(DAG);
   CLI.setDebugLoc(dl)
       .setChain(DAG.getEntryNode())
       .setLibCallee(CallingConv::Fast, RetTy, Callee, std::move(Args));
 
   std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
   return CallResult.first;
 }

lib/Target/ARM/ARMISelLowering.cpp

SDValue ARMTargetLowering::LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const {
   EVT ArgVT = Arg.getValueType();
   Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
   auto PtrVT = getPointerTy(DAG.getDataLayout());
 
   MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
 
   // Pair of floats / doubles used to pass the result.
-  Type *RetTy = StructType::get(ArgTy, ArgTy, nullptr);
+  Type *RetTy = StructType::get(ArgTy, ArgTy);
   auto &DL = DAG.getDataLayout();
 
   ArgListTy Args;
   bool ShouldUseSRet = Subtarget->isAPCS_ABI();
   SDValue SRet;
   if (ShouldUseSRet) {
     // Create stack object for sret.
     const uint64_t ByteSize = DL.getTypeAllocSize(RetTy);
SDValue ARMTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
 
   TargetLowering::ArgListTy Args = getDivRemArgList(Op.getNode(),
                                                     DAG.getContext(),
                                                     Subtarget);
 
   SDValue Callee = DAG.getExternalSymbol(getLibcallName(LC),
                                          getPointerTy(DAG.getDataLayout()));
 
-  Type *RetTy = (Type*)StructType::get(Ty, Ty, nullptr);
+  Type *RetTy = StructType::get(Ty, Ty);
 
   if (Subtarget->isTargetWindows())
     InChain = WinDBZCheckDenominator(DAG, Op.getNode(), InChain);
 
   TargetLowering::CallLoweringInfo CLI(DAG);
   CLI.setDebugLoc(dl).setChain(InChain)
     .setCallee(getLibcallCallingConv(LC), RetTy, Callee, std::move(Args))
     .setInRegister().setSExtResult(isSigned).setZExtResult(!isSigned);

lib/Target/X86/X86ISelLowering.cpp

static SDValue LowerFSINCOS(SDValue Op, const X86Subtarget &Subtarget,
   // Only optimize x86_64 for now. i386 is a bit messy. For f32,
   // the small struct {f32, f32} is returned in (eax, edx). For f64,
   // the results are returned via SRet in memory.
   const char *LibcallName =  isF64 ? "__sincos_stret" : "__sincosf_stret";
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
   SDValue Callee =
       DAG.getExternalSymbol(LibcallName, TLI.getPointerTy(DAG.getDataLayout()));
 
-  Type *RetTy = isF64
-    ? (Type*)StructType::get(ArgTy, ArgTy, nullptr)
-    : (Type*)VectorType::get(ArgTy, 4);
+  Type *RetTy = isF64 ? (Type *)StructType::get(ArgTy, ArgTy)
+                      : (Type *)VectorType::get(ArgTy, 4);
 
   TargetLowering::CallLoweringInfo CLI(DAG);
   CLI.setDebugLoc(dl)
       .setChain(DAG.getEntryNode())
       .setLibCallee(CallingConv::C, RetTy, Callee, std::move(Args));
 
   std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
 

lib/Transforms/Instrumentation/AddressSanitizer.cpp

 void AddressSanitizerModule::InstrumentGlobalsMachO(
     IRBuilder<> &IRB, Module &M, ArrayRef<GlobalVariable *> ExtendedGlobals,
     ArrayRef<Constant *> MetadataInitializers) {
   assert(ExtendedGlobals.size() == MetadataInitializers.size());
 
   // On recent Mach-O platforms, use a structure which binds the liveness of
   // the global variable to the metadata struct. Keep the list of "Liveness" GV
   // created to be added to llvm.compiler.used
-  StructType *LivenessTy = StructType::get(IntptrTy, IntptrTy, nullptr);
+  StructType *LivenessTy = StructType::get(IntptrTy, IntptrTy);
   SmallVector<GlobalValue *, 16> LivenessGlobals(ExtendedGlobals.size());
 
   for (size_t i = 0; i < ExtendedGlobals.size(); i++) {
     Constant *Initializer = MetadataInitializers[i];
     GlobalVariable *G = ExtendedGlobals[i];
     GlobalVariable *Metadata =
         CreateMetadataGlobal(M, Initializer, G->getName());
 
     // On recent Mach-O platforms, we emit the global metadata in a way that
     // allows the linker to properly strip dead globals.
-    auto LivenessBinder = ConstantStruct::get(
-        LivenessTy, Initializer->getAggregateElement(0u),
-        ConstantExpr::getPointerCast(Metadata, IntptrTy), nullptr);
+    auto LivenessBinder =
+        ConstantStruct::get(LivenessTy, Initializer->getAggregateElement(0u),
+                            ConstantExpr::getPointerCast(Metadata, IntptrTy));
     GlobalVariable *Liveness = new GlobalVariable(
         M, LivenessTy, false, GlobalVariable::InternalLinkage, LivenessBinder,
         Twine("__asan_binder_") + G->getName());
     Liveness->setSection("__DATA,__asan_liveness,regular,live_support");
     LivenessGlobals[i] = Liveness;
   }
 
   // Update llvm.compiler.used, adding the new liveness globals. This is
bool AddressSanitizerModule::InstrumentGlobals(IRBuilder<> &IRB, Module &M) {
   //   const char *name;
   //   const char *module_name;
   //   size_t has_dynamic_init;
   //   void *source_location;
   //   size_t odr_indicator;
   // We initialize an array of such structures and pass it to a run-time call.
   StructType *GlobalStructTy =
       StructType::get(IntptrTy, IntptrTy, IntptrTy, IntptrTy, IntptrTy,
-                      IntptrTy, IntptrTy, IntptrTy, nullptr);
+                      IntptrTy, IntptrTy, IntptrTy);
   SmallVector<GlobalVariable *, 16> NewGlobals(n);
   SmallVector<Constant *, 16> Initializers(n);
 
   bool HasDynamicallyInitializedGlobals = false;
 
   // We shouldn't merge same module names, as this string serves as unique
   // module ID in runtime.
   GlobalVariable *ModuleName = createPrivateGlobalForString(
for (size_t i = 0; i < n; i++) {
     uint64_t RZ = std::max(
         MinRZ, std::min(kMaxGlobalRedzone, (SizeInBytes / MinRZ / 4) * MinRZ));
     uint64_t RightRedzoneSize = RZ;
     // Round up to MinRZ
     if (SizeInBytes % MinRZ) RightRedzoneSize += MinRZ - (SizeInBytes % MinRZ);
     assert(((RightRedzoneSize + SizeInBytes) % MinRZ) == 0);
     Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize);
 
-    StructType *NewTy = StructType::get(Ty, RightRedZoneTy, nullptr);
-    Constant *NewInitializer =
-        ConstantStruct::get(NewTy, G->getInitializer(),
-                            Constant::getNullValue(RightRedZoneTy), nullptr);
+    StructType *NewTy = StructType::get(Ty, RightRedZoneTy);
+    Constant *NewInitializer = ConstantStruct::get(
+        NewTy, G->getInitializer(), Constant::getNullValue(RightRedZoneTy));
 
     // Create a new global variable with enough space for a redzone.
     GlobalValue::LinkageTypes Linkage = G->getLinkage();
     if (G->isConstant() && Linkage == GlobalValue::PrivateLinkage)
       Linkage = GlobalValue::InternalLinkage;
     GlobalVariable *NewGlobal =
         new GlobalVariable(M, NewTy, G->isConstant(), Linkage, NewInitializer,
                            "", G, G->getThreadLocalMode());
for (size_t i = 0; i < n; i++) {
     Constant *Initializer = ConstantStruct::get(
         GlobalStructTy,
         ConstantExpr::getPointerCast(InstrumentedGlobal, IntptrTy),
         ConstantInt::get(IntptrTy, SizeInBytes),
         ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize),
         ConstantExpr::getPointerCast(Name, IntptrTy),
         ConstantExpr::getPointerCast(ModuleName, IntptrTy),
         ConstantInt::get(IntptrTy, MD.IsDynInit), SourceLoc,
-        ConstantExpr::getPointerCast(ODRIndicator, IntptrTy), nullptr);
+        ConstantExpr::getPointerCast(ODRIndicator, IntptrTy));
 
     if (ClInitializers && MD.IsDynInit) HasDynamicallyInitializedGlobals = true;
 
     DEBUG(dbgs() << "NEW GLOBAL: " << *NewGlobal << "\n");
 
     Initializers[i] = Initializer;
   }
 

lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

 
 FunctionType *DataFlowSanitizer::getArgsFunctionType(FunctionType *T) {
   llvm::SmallVector<Type *, 4> ArgTypes(T->param_begin(), T->param_end());
   ArgTypes.append(T->getNumParams(), ShadowTy);
   if (T->isVarArg())
     ArgTypes.push_back(ShadowPtrTy);
   Type *RetType = T->getReturnType();
   if (!RetType->isVoidTy())
-    RetType = StructType::get(RetType, ShadowTy, (Type *)nullptr);
+    RetType = StructType::get(RetType, ShadowTy);
   return FunctionType::get(RetType, ArgTypes, T->isVarArg());
 }
 
 FunctionType *DataFlowSanitizer::getTrampolineFunctionType(FunctionType *T) {
   assert(!T->isVarArg());
   llvm::SmallVector<Type *, 4> ArgTypes;
   ArgTypes.push_back(T->getPointerTo());
   ArgTypes.append(T->param_begin(), T->param_end());
DFSanVarargWrapperFnTy = FunctionType::get(
       Type::getVoidTy(*Ctx), Type::getInt8PtrTy(*Ctx), /*isVarArg=*/false);
 
   if (GetArgTLSPtr) {
     Type *ArgTLSTy = ArrayType::get(ShadowTy, 64);
     ArgTLS = nullptr;
     GetArgTLS = ConstantExpr::getIntToPtr(
         ConstantInt::get(IntptrTy, uintptr_t(GetArgTLSPtr)),
         PointerType::getUnqual(
-            FunctionType::get(PointerType::getUnqual(ArgTLSTy),
-                              (Type *)nullptr)));
+            FunctionType::get(PointerType::getUnqual(ArgTLSTy), false)));
   }
   if (GetRetvalTLSPtr) {
     RetvalTLS = nullptr;
     GetRetvalTLS = ConstantExpr::getIntToPtr(
         ConstantInt::get(IntptrTy, uintptr_t(GetRetvalTLSPtr)),
         PointerType::getUnqual(
-            FunctionType::get(PointerType::getUnqual(ShadowTy),
-                              (Type *)nullptr)));
+            FunctionType::get(PointerType::getUnqual(ShadowTy), false)));
   }
 
   ColdCallWeights = MDBuilder(*Ctx).createBranchWeights(1, 1000);
   return true;
 }
 
 bool DataFlowSanitizer::isInstrumented(const Function *F) {
   return !ABIList.isIn(*F, "uninstrumented");

lib/Transforms/Instrumentation/EfficiencySanitizer.cpp

GlobalVariable *EfficiencySanitizer::createCacheFragInfoGV(
   //   u32 NumFields;
   //   u32 *FieldOffset;           // auxiliary struct field info.
   //   u32 *FieldSize;             // auxiliary struct field info.
   //   const char **FieldTypeName; // auxiliary struct field info.
   //   u64 *FieldCounters;
   //   u64 *ArrayCounter;
   // };
   auto *StructInfoTy =
       StructType::get(Int8PtrTy, Int32Ty, Int32Ty, Int32PtrTy, Int32PtrTy,
-                    Int8PtrPtrTy, Int64PtrTy, Int64PtrTy, nullptr);
+                      Int8PtrPtrTy, Int64PtrTy, Int64PtrTy);
   auto *StructInfoPtrTy = StructInfoTy->getPointerTo();
   // This structure should be kept consistent with the CacheFragInfo struct
   // in the runtime library.
   // struct CacheFragInfo {
   //   const char *UnitName;
   //   u32 NumStructs;
   //   StructInfo *Structs;
   // };
-  auto *CacheFragInfoTy =
-    StructType::get(Int8PtrTy, Int32Ty, StructInfoPtrTy, nullptr);
+  auto *CacheFragInfoTy = StructType::get(Int8PtrTy, Int32Ty, StructInfoPtrTy);
 
   std::vector<StructType *> Vec = M.getIdentifiedStructTypes();
   unsigned NumStructs = 0;
   SmallVector<Constant *, 16> Initializers;
 
   for (auto &StructTy : Vec) {
     if (shouldIgnoreStructType(StructTy)) {
       ++NumIgnoredStructs;
for (auto &StructTy : Vec) {
     Constant *FieldCounterIdx[2];
     FieldCounterIdx[0] = ConstantInt::get(Int32Ty, 0);
     FieldCounterIdx[1] = ConstantInt::get(Int32Ty,
                                           getFieldCounterIdx(StructTy));
     Constant *ArrayCounterIdx[2];
     ArrayCounterIdx[0] = ConstantInt::get(Int32Ty, 0);
     ArrayCounterIdx[1] = ConstantInt::get(Int32Ty,
                                           getArrayCounterIdx(StructTy));
-    Initializers.push_back(
-        ConstantStruct::get(
-            StructInfoTy,
-            ConstantExpr::getPointerCast(StructCounterName, Int8PtrTy),
-            ConstantInt::get(Int32Ty,
-                             DL.getStructLayout(StructTy)->getSizeInBytes()),
-            ConstantInt::get(Int32Ty, StructTy->getNumElements()),
-            Offset == nullptr ? ConstantPointerNull::get(Int32PtrTy) :
-                ConstantExpr::getPointerCast(Offset, Int32PtrTy),
-            Size == nullptr ? ConstantPointerNull::get(Int32PtrTy) :
-                ConstantExpr::getPointerCast(Size, Int32PtrTy),
-            TypeName == nullptr ? ConstantPointerNull::get(Int8PtrPtrTy) :
-                ConstantExpr::getPointerCast(TypeName, Int8PtrPtrTy),
-            ConstantExpr::getGetElementPtr(CounterArrayTy, Counters,
-                                           FieldCounterIdx),
-            ConstantExpr::getGetElementPtr(CounterArrayTy, Counters,
-                                           ArrayCounterIdx),
-            nullptr));
+    Initializers.push_back(ConstantStruct::get(
+        Offset == nullptr ? ConstantPointerNull::get(Int32PtrTy)
+                          : ConstantExpr::getPointerCast(Offset, Int32PtrTy),
+        Size == nullptr ? ConstantPointerNull::get(Int32PtrTy)
+                        : ConstantExpr::getPointerCast(Size, Int32PtrTy),
+        TypeName == nullptr
+            ? ConstantPointerNull::get(Int8PtrPtrTy)
+            : ConstantExpr::getPointerCast(TypeName, Int8PtrPtrTy),
+                                       ArrayCounterIdx)));
   }
   // Structs.
   Constant *StructInfo;
   if (NumStructs == 0) {
     StructInfo = ConstantPointerNull::get(StructInfoPtrTy);
   } else {
     auto *StructInfoArrayTy = ArrayType::get(StructInfoTy, NumStructs);
     StructInfo = ConstantExpr::getPointerCast(
         new GlobalVariable(M, StructInfoArrayTy, false,
                            GlobalVariable::InternalLinkage,
                            ConstantArray::get(StructInfoArrayTy, Initializers)),
         StructInfoPtrTy);
   }
 
   auto *CacheFragInfoGV = new GlobalVariable(
       M, CacheFragInfoTy, true, GlobalVariable::InternalLinkage,
-      ConstantStruct::get(CacheFragInfoTy,
-                          UnitName,
-                          ConstantInt::get(Int32Ty, NumStructs),
-                          StructInfo,
-                          nullptr));
+      ConstantStruct::get(CacheFragInfoTy, UnitName,
+                          ConstantInt::get(Int32Ty, NumStructs), StructInfo));
   return CacheFragInfoGV;
 }
 
 // Create the tool-specific argument passed to EsanInit and EsanExit.
 Constant *EfficiencySanitizer::createEsanInitToolInfoArg(Module &M,
                                                          const DataLayout &DL) {
   // This structure contains tool-specific information about each compilation
   // unit (module) and is passed to the runtime library.

lib/Transforms/Utils/EscapeEnumerator.cpp

for (Instruction &II : BB)
           Calls.push_back(CI);
 
   if (Calls.empty())
     return nullptr;
 
   // Create a cleanup block.
   LLVMContext &C = F.getContext();
   BasicBlock *CleanupBB = BasicBlock::Create(C, CleanupBBName, &F);
-  Type *ExnTy =
-      StructType::get(Type::getInt8PtrTy(C), Type::getInt32Ty(C), nullptr);
+  Type *ExnTy = StructType::get(Type::getInt8PtrTy(C), Type::getInt32Ty(C));
   if (!F.hasPersonalityFn()) {
     Constant *PersFn = getDefaultPersonalityFn(F.getParent());
     F.setPersonalityFn(PersFn);
   }
 
   if (isFuncletEHPersonality(classifyEHPersonality(F.getPersonalityFn()))) {
     report_fatal_error("Funclet EH not supported");
   }

lib/Transforms/Utils/ModuleUtils.cpp

static void appendToGlobalArray(const char *Array, Module &M, Function *F,
   SmallVector<Constant *, 16> CurrentCtors;
   StructType *EltTy;
   if (GlobalVariable *GVCtor = M.getNamedGlobal(Array)) {
     ArrayType *ATy = cast<ArrayType>(GVCtor->getValueType());
     StructType *OldEltTy = cast<StructType>(ATy->getElementType());
     // Upgrade a 2-field global array type to the new 3-field format if needed.
     if (Data && OldEltTy->getNumElements() < 3)
       EltTy = StructType::get(IRB.getInt32Ty(), PointerType::getUnqual(FnTy),
-                              IRB.getInt8PtrTy(), nullptr);
+                              IRB.getInt8PtrTy());
     else
       EltTy = OldEltTy;
     if (Constant *Init = GVCtor->getInitializer()) {
       unsigned n = Init->getNumOperands();
       CurrentCtors.reserve(n + 1);
       for (unsigned i = 0; i != n; ++i) {
         auto Ctor = cast<Constant>(Init->getOperand(i));
         if (EltTy != OldEltTy)
-          Ctor = ConstantStruct::get(
-              EltTy, Ctor->getAggregateElement((unsigned)0),
+          Ctor =
+              ConstantStruct::get(EltTy, Ctor->getAggregateElement((unsigned)0),
                                   Ctor->getAggregateElement(1),
-              Constant::getNullValue(IRB.getInt8PtrTy()), nullptr);
+                                  Constant::getNullValue(IRB.getInt8PtrTy()));
         CurrentCtors.push_back(Ctor);
       }
     }
     GVCtor->eraseFromParent();
   } else {
     // Use the new three-field struct if there isn't one already.
     EltTy = StructType::get(IRB.getInt32Ty(), PointerType::getUnqual(FnTy),
-                            IRB.getInt8PtrTy(), nullptr);
+                            IRB.getInt8PtrTy());
   }
 
   // Build a 2 or 3 field global_ctor entry.  We don't take a comdat key.
   Constant *CSVals[3];
   CSVals[0] = IRB.getInt32(Priority);
   CSVals[1] = F;
   // FIXME: Drop support for the two element form in LLVM 4.0.
   if (EltTy->getNumElements() >= 3)

lib/Transforms/Utils/SimplifyLibCalls.cpp

static void insertSinCosCall(IRBuilder<> &B, Function *OrigCallee, Value *Arg,
   Triple T(OrigCallee->getParent()->getTargetTriple());
   if (UseFloat) {
     Name = "__sincospif_stret";
 
     assert(T.getArch() != Triple::x86 && "x86 messy and unsupported for now");
     // x86_64 can't use {float, float} since that would be returned in both
     // xmm0 and xmm1, which isn't what a real struct would do.
     ResTy = T.getArch() == Triple::x86_64
                 ? static_cast<Type *>(VectorType::get(ArgTy, 2))
-    : static_cast<Type *>(StructType::get(ArgTy, ArgTy, nullptr));
+                : static_cast<Type *>(StructType::get(ArgTy, ArgTy));
   } else {
     Name = "__sincospi_stret";
-    ResTy = StructType::get(ArgTy, ArgTy, nullptr);
+    ResTy = StructType::get(ArgTy, ArgTy);
   }
 
   Module *M = OrigCallee->getParent();
   Value *Callee = M->getOrInsertFunction(Name, OrigCallee->getAttributes(),
                                          ResTy, ArgTy);
 
   if (Instruction *ArgInst = dyn_cast<Instruction>(Arg)) {
     // If the argument is an instruction, it must dominate all uses so put our

lib/Transforms/Utils/ValueMapper.cpp

if (IsOldCtorDtor) {
     Type *Tys[3] = {ST.getElementType(0), ST.getElementType(1), VoidPtrTy};
     EltTy = StructType::get(GV.getContext(), Tys, false);
   }
 
   for (auto *V : NewMembers) {
     Constant *NewV;
     if (IsOldCtorDtor) {
       auto *S = cast<ConstantStruct>(V);
-      auto *E1 = mapValue(S->getOperand(0));
-      auto *E2 = mapValue(S->getOperand(1));
-      Value *Null = Constant::getNullValue(VoidPtrTy);
-      NewV =
-          ConstantStruct::get(cast<StructType>(EltTy), E1, E2, Null, nullptr);
+      auto *E1 = cast<Constant>(mapValue(S->getOperand(0)));
+      auto *E2 = cast<Constant>(mapValue(S->getOperand(1)));
+      Constant *Null = Constant::getNullValue(VoidPtrTy);
+      NewV = ConstantStruct::get(cast<StructType>(EltTy), E1, E2, Null);
     } else {
       NewV = cast_or_null<Constant>(mapValue(V));
     }
     Elements.push_back(NewV);
   }
 
   GV.setInitializer(ConstantArray::get(
       cast<ArrayType>(GV.getType()->getElementType()), Elements));

tools/bugpoint/ExtractFunction.cpp

 
 /// GetTorInit - Given a list of entries for static ctors/dtors, return them
 /// as a constant array.
 static Constant *GetTorInit(std::vector<std::pair<Function *, int>> &TorList) {
   assert(!TorList.empty() && "Don't create empty tor list!");
   std::vector<Constant *> ArrayElts;
   Type *Int32Ty = Type::getInt32Ty(TorList[0].first->getContext());
 
-  StructType *STy =
-      StructType::get(Int32Ty, TorList[0].first->getType(), nullptr);
+  StructType *STy = StructType::get(Int32Ty, TorList[0].first->getType());
   for (unsigned i = 0, e = TorList.size(); i != e; ++i) {
     Constant *Elts[] = {ConstantInt::get(Int32Ty, TorList[i].second),
                         TorList[i].first};
     ArrayElts.push_back(ConstantStruct::get(STy, Elts));
   }
   return ConstantArray::get(
       ArrayType::get(ArrayElts[0]->getType(), ArrayElts.size()), ArrayElts);
 }

unittests/ExecutionEngine/Orc/OrcTestCommon.h

 };
 
 // TypeBuilder specialization for DummyStruct.
 template <bool XCompile>
 class TypeBuilder<DummyStruct, XCompile> {
 public:
   static StructType *get(LLVMContext &Context) {
     return StructType::get(
-      TypeBuilder<types::i<32>[256], XCompile>::get(Context), nullptr);
+        TypeBuilder<types::i<32>[256], XCompile>::get(Context));
   }
 };
 
 template <typename HandleT,
           typename AddModuleSetFtor,
           typename RemoveModuleSetFtor,
           typename FindSymbolFtor,
           typename FindSymbolInFtor>

unittests/IR/TypeBuilderTest.cpp

enum Fields {
     FIELD_ARRAY
   };
 };
 }  // namespace llvm
 namespace {
 
 TEST(TypeBuilderTest, Extensions) {
   LLVMContext Context;
-  EXPECT_EQ(PointerType::getUnqual(StructType::get(
-                TypeBuilder<int, false>::get(Context),
+  EXPECT_EQ(PointerType::getUnqual(
+                StructType::get(TypeBuilder<int, false>::get(Context),
                                 TypeBuilder<int *, false>::get(Context),
-                TypeBuilder<void *[], false>::get(Context), (void *)nullptr)),
+                                TypeBuilder<void *[], false>::get(Context))),
             (TypeBuilder<MyType *, false>::get(Context)));
-  EXPECT_EQ(
-      PointerType::getUnqual(StructType::get(
+  EXPECT_EQ(PointerType::getUnqual(StructType::get(
                 TypeBuilder<types::i<32>, false>::get(Context),
                 TypeBuilder<types::i<32> *, false>::get(Context),
-          TypeBuilder<types::i<8> *[], false>::get(Context), (void *)nullptr)),
+                TypeBuilder<types::i<8> *[], false>::get(Context))),
             (TypeBuilder<MyPortableType *, false>::get(Context)));
-  EXPECT_EQ(
-      PointerType::getUnqual(StructType::get(
+  EXPECT_EQ(PointerType::getUnqual(StructType::get(
                 TypeBuilder<types::i<32>, false>::get(Context),
                 TypeBuilder<types::i<32> *, false>::get(Context),
-          TypeBuilder<types::i<8> *[], false>::get(Context), (void *)nullptr)),
+                TypeBuilder<types::i<8> *[], false>::get(Context))),
             (TypeBuilder<MyPortableType *, true>::get(Context)));
 }
 
 }  // anonymous namespace