Index: docs/NVPTXUsage.rst =================================================================== --- docs/NVPTXUsage.rst +++ docs/NVPTXUsage.rst @@ -361,7 +361,7 @@ .. code-block:: c++ - extern ModulePass *llvm::createNVVMReflectPass(const StringMap& Mapping); + extern FunctionPass *llvm::createNVVMReflectPass(const StringMap& Mapping); StringMap ReflectParams; ReflectParams["__CUDA_FTZ"] = 1; Index: lib/Target/NVPTX/NVPTX.h =================================================================== --- lib/Target/NVPTX/NVPTX.h +++ lib/Target/NVPTX/NVPTX.h @@ -47,8 +47,8 @@ ModulePass *createGenericToNVVMPass(); FunctionPass *createNVPTXFavorNonGenericAddrSpacesPass(); FunctionPass *createNVPTXInferAddressSpacesPass(); -ModulePass *createNVVMReflectPass(); -ModulePass *createNVVMReflectPass(const StringMap& Mapping); +FunctionPass *createNVVMReflectPass(); +FunctionPass *createNVVMReflectPass(const StringMap &Mapping); MachineFunctionPass *createNVPTXPrologEpilogPass(); MachineFunctionPass *createNVPTXReplaceImageHandlesPass(); FunctionPass *createNVPTXImageOptimizerPass(); Index: lib/Target/NVPTX/NVVMReflect.cpp =================================================================== --- lib/Target/NVPTX/NVVMReflect.cpp +++ lib/Target/NVPTX/NVVMReflect.cpp @@ -7,20 +7,23 @@ // //===----------------------------------------------------------------------===// // -// This pass replaces occurrences of __nvvm_reflect("string") with an -// integer based on -nvvm-reflect-list string= option given to this pass. -// If an undefined string value is seen in a call to __nvvm_reflect("string"), -// a default value of 0 will be used. +// This pass replaces occurrences of __nvvm_reflect("string") and +// llvm.nvvm.reflect with an integer based on the value of -nvvm-reflect-list +// string=. +// +// If we see a string not specified in our flags, we replace that call with 0. // //===----------------------------------------------------------------------===// #include "NVPTX.h" #include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/DenseSet.h" #include "llvm/ADT/SmallVector.h" #include "llvm/ADT/StringMap.h" #include "llvm/IR/Constants.h" #include "llvm/IR/DerivedTypes.h" #include "llvm/IR/Function.h" +#include "llvm/IR/InstIterator.h" #include "llvm/IR/Instructions.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/Module.h" @@ -35,7 +38,6 @@ #include #include #include - #define NVVM_REFLECT_FUNCTION "__nvvm_reflect" using namespace llvm; @@ -45,31 +47,25 @@ namespace llvm { void initializeNVVMReflectPass(PassRegistry &); } namespace { -class NVVMReflect : public ModulePass { +class NVVMReflect : public FunctionPass { private: StringMap VarMap; - typedef DenseMap::iterator VarMapIter; public: static char ID; - NVVMReflect() : ModulePass(ID) { - initializeNVVMReflectPass(*PassRegistry::getPassRegistry()); - VarMap.clear(); - } + NVVMReflect() : NVVMReflect(StringMap()) {} - NVVMReflect(const StringMap &Mapping) - : ModulePass(ID) { + NVVMReflect(const StringMap &Mapping) : FunctionPass(ID) { initializeNVVMReflectPass(*PassRegistry::getPassRegistry()); - for (StringMap::const_iterator I = Mapping.begin(), E = Mapping.end(); - I != E; ++I) { - VarMap[(*I).getKey()] = (*I).getValue(); - } + for (const auto &KV : Mapping) + VarMap[KV.getKey()] = KV.getValue(); + setVarMap(); } void getAnalysisUsage(AnalysisUsage &AU) const override { AU.setPreservesAll(); } - bool runOnModule(Module &) override; + bool runOnFunction(Function &) override; private: bool handleFunction(Function *ReflectFunction); @@ -77,11 +73,8 @@ }; } -ModulePass *llvm::createNVVMReflectPass() { - return new NVVMReflect(); -} - -ModulePass *llvm::createNVVMReflectPass(const StringMap& Mapping) { +FunctionPass *llvm::createNVVMReflectPass() { return new NVVMReflect(); } +FunctionPass *llvm::createNVVMReflectPass(const StringMap &Mapping) { return new NVVMReflect(Mapping); } @@ -123,30 +116,35 @@ } } -bool NVVMReflect::handleFunction(Function *ReflectFunction) { - // Validate _reflect function - assert(ReflectFunction->isDeclaration() && - "_reflect function should not have a body"); - assert(ReflectFunction->getReturnType()->isIntegerTy() && - "_reflect's return type should be integer"); +bool NVVMReflect::runOnFunction(Function &F) { + if (!NVVMReflectEnabled) + return false; - std::vector ToRemove; + if (F.getName() == NVVM_REFLECT_FUNCTION) { + assert(F.isDeclaration() && "_reflect function should not have a body"); + assert(F.getReturnType()->isIntegerTy() && + "_reflect's return type should be integer"); + return false; + } - // Go through the uses of ReflectFunction in this Function. - // Each of them should a CallInst with a ConstantArray argument. - // First validate that. If the c-string corresponding to the - // ConstantArray can be found successfully, see if it can be - // found in VarMap. If so, replace the uses of CallInst with the - // value found in VarMap. If not, replace the use with value 0. + SmallVector ToRemove; - // IR for __nvvm_reflect calls differs between CUDA versions: + // Go through the calls in this instruction. Each call to __nvvm_reflect or + // llvm.nvvm.reflect should be a CallInst with a ConstantArray argument. + // First validate that. If the c-string corresponding to the ConstantArray can + // be found successfully, see if it can be found in VarMap. If so, replace the + // uses of CallInst with the value found in VarMap. If not, replace the use + // with value 0. + + // The IR for __nvvm_reflect calls differs between CUDA versions. + // // CUDA 6.5 and earlier uses this sequence: // %ptr = tail call i8* @llvm.nvvm.ptr.constant.to.gen.p0i8.p4i8 // (i8 addrspace(4)* getelementptr inbounds // ([8 x i8], [8 x i8] addrspace(4)* @str, i32 0, i32 0)) // %reflect = tail call i32 @__nvvm_reflect(i8* %ptr) // - // Value returned by Sym->getOperand(0) is a Constant with a + // The value returned by Sym->getOperand(0) is a Constant with a // ConstantDataSequential operand which can be converted to string and used // for lookup. // @@ -157,31 +155,38 @@ // // In this case, we get a Constant with a GlobalVariable operand and we need // to dig deeper to find its initializer with the string we'll use for lookup. + for (Instruction &I : instructions(F)) { + CallInst *Call = dyn_cast(&I); + if (!Call) + continue; + Function *Callee = Call->getCalledFunction(); + if (!Callee || (Callee->getName() != NVVM_REFLECT_FUNCTION && + Callee->getIntrinsicID() != Intrinsic::nvvm_reflect)) + continue; - for (User *U : ReflectFunction->users()) { - assert(isa(U) && "Only a call instruction can use _reflect"); - CallInst *Reflect = cast(U); + // FIXME: Improve error handling here and elsewhere in this pass. + assert(Call->getNumOperands() == 2 && + "Wrong number of operands to __nvvm_reflect function"); - assert((Reflect->getNumOperands() == 2) && - "Only one operand expect for _reflect function"); - // In cuda, we will have an extra constant-to-generic conversion of - // the string. - const Value *Str = Reflect->getArgOperand(0); + // In cuda 6.5 and earlier, we will have an extra constant-to-generic + // conversion of the string. + const Value *Str = Call->getArgOperand(0); if (isa(Str)) { - // CUDA path const CallInst *ConvCall = cast(Str); + // FIXME: Add assertions about ConvCall. Str = ConvCall->getArgOperand(0); } assert(isa(Str) && - "Format of _reflect function not recognized"); + "Format of __nvvm__reflect function not recognized"); const ConstantExpr *GEP = cast(Str); const Value *Sym = GEP->getOperand(0); - assert(isa(Sym) && "Format of _reflect function not recognized"); + assert(isa(Sym) && + "Format of __nvvm_reflect function not recognized"); const Value *Operand = cast(Sym)->getOperand(0); if (const GlobalVariable *GV = dyn_cast(Operand)) { - // For CUDA-7.0 style __nvvm_reflect calls we need to find operand's + // For CUDA-7.0 style __nvvm_reflect calls, we need to find the operand's // initializer. assert(GV->hasInitializer() && "Format of _reflect function not recognized"); @@ -194,57 +199,20 @@ assert(cast(Operand)->isCString() && "Format of _reflect function not recognized"); - std::string ReflectArg = - cast(Operand)->getAsString(); - + StringRef ReflectArg = cast(Operand)->getAsString(); ReflectArg = ReflectArg.substr(0, ReflectArg.size() - 1); DEBUG(dbgs() << "Arg of _reflect : " << ReflectArg << "\n"); int ReflectVal = 0; // The default value is 0 - if (VarMap.find(ReflectArg) != VarMap.end()) { - ReflectVal = VarMap[ReflectArg]; - } - Reflect->replaceAllUsesWith( - ConstantInt::get(Reflect->getType(), ReflectVal)); - ToRemove.push_back(Reflect); - } - if (ToRemove.size() == 0) - return false; - - for (unsigned i = 0, e = ToRemove.size(); i != e; ++i) - ToRemove[i]->eraseFromParent(); - return true; -} - -bool NVVMReflect::runOnModule(Module &M) { - if (!NVVMReflectEnabled) - return false; - - setVarMap(); - - - bool Res = false; - std::string Name; - Type *Tys[1]; - Type *I8Ty = Type::getInt8Ty(M.getContext()); - Function *ReflectFunction; - - // Check for standard overloaded versions of llvm.nvvm.reflect - - for (unsigned i = 0; i != 5; ++i) { - Tys[0] = PointerType::get(I8Ty, i); - Name = Intrinsic::getName(Intrinsic::nvvm_reflect, Tys); - ReflectFunction = M.getFunction(Name); - if(ReflectFunction != 0) { - Res |= handleFunction(ReflectFunction); - } + auto Iter = VarMap.find(ReflectArg); + if (Iter != VarMap.end()) + ReflectVal = Iter->second; + Call->replaceAllUsesWith(ConstantInt::get(Call->getType(), ReflectVal)); + ToRemove.push_back(Call); } - ReflectFunction = M.getFunction(NVVM_REFLECT_FUNCTION); - // If reflect function is not used, then there will be - // no entry in the module. - if (ReflectFunction != 0) - Res |= handleFunction(ReflectFunction); + for (Instruction *I : ToRemove) + I->eraseFromParent(); - return Res; + return ToRemove.size() > 0; }