| //===- NVVMReflect.cpp - NVVM Emulate conditional compilation -------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This pass replaces occurrences of __nvvm_reflect("string") with an |
| // integer based on -nvvm-reflect-list string=<int> 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "NVPTX.h" |
| #include "llvm/ADT/DenseMap.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/Instructions.h" |
| #include "llvm/IR/Intrinsics.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/IR/Type.h" |
| #include "llvm/Pass.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/raw_os_ostream.h" |
| #include "llvm/Transforms/Scalar.h" |
| #include <map> |
| #include <sstream> |
| #include <string> |
| #include <vector> |
| |
| #define NVVM_REFLECT_FUNCTION "__nvvm_reflect" |
| |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "nvptx-reflect" |
| |
| namespace llvm { void initializeNVVMReflectPass(PassRegistry &); } |
| |
| namespace { |
| class NVVMReflect : public ModulePass { |
| private: |
| StringMap<int> VarMap; |
| typedef DenseMap<std::string, int>::iterator VarMapIter; |
| |
| public: |
| static char ID; |
| NVVMReflect() : ModulePass(ID) { |
| initializeNVVMReflectPass(*PassRegistry::getPassRegistry()); |
| VarMap.clear(); |
| } |
| |
| NVVMReflect(const StringMap<int> &Mapping) |
| : ModulePass(ID) { |
| initializeNVVMReflectPass(*PassRegistry::getPassRegistry()); |
| for (StringMap<int>::const_iterator I = Mapping.begin(), E = Mapping.end(); |
| I != E; ++I) { |
| VarMap[(*I).getKey()] = (*I).getValue(); |
| } |
| } |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const override { |
| AU.setPreservesAll(); |
| } |
| bool runOnModule(Module &) override; |
| |
| private: |
| bool handleFunction(Function *ReflectFunction); |
| void setVarMap(); |
| }; |
| } |
| |
| ModulePass *llvm::createNVVMReflectPass() { |
| return new NVVMReflect(); |
| } |
| |
| ModulePass *llvm::createNVVMReflectPass(const StringMap<int>& Mapping) { |
| return new NVVMReflect(Mapping); |
| } |
| |
| static cl::opt<bool> |
| NVVMReflectEnabled("nvvm-reflect-enable", cl::init(true), cl::Hidden, |
| cl::desc("NVVM reflection, enabled by default")); |
| |
| char NVVMReflect::ID = 0; |
| INITIALIZE_PASS(NVVMReflect, "nvvm-reflect", |
| "Replace occurrences of __nvvm_reflect() calls with 0/1", false, |
| false) |
| |
| static cl::list<std::string> |
| ReflectList("nvvm-reflect-list", cl::value_desc("name=<int>"), cl::Hidden, |
| cl::desc("A list of string=num assignments"), |
| cl::ValueRequired); |
| |
| /// The command line can look as follows : |
| /// -nvvm-reflect-list a=1,b=2 -nvvm-reflect-list c=3,d=0 -R e=2 |
| /// The strings "a=1,b=2", "c=3,d=0", "e=2" are available in the |
| /// ReflectList vector. First, each of ReflectList[i] is 'split' |
| /// using "," as the delimiter. Then each of this part is split |
| /// using "=" as the delimiter. |
| void NVVMReflect::setVarMap() { |
| for (unsigned i = 0, e = ReflectList.size(); i != e; ++i) { |
| DEBUG(dbgs() << "Option : " << ReflectList[i] << "\n"); |
| SmallVector<StringRef, 4> NameValList; |
| StringRef(ReflectList[i]).split(NameValList, ","); |
| for (unsigned j = 0, ej = NameValList.size(); j != ej; ++j) { |
| SmallVector<StringRef, 2> NameValPair; |
| NameValList[j].split(NameValPair, "="); |
| assert(NameValPair.size() == 2 && "name=val expected"); |
| std::stringstream ValStream(NameValPair[1]); |
| int Val; |
| ValStream >> Val; |
| assert((!(ValStream.fail())) && "integer value expected"); |
| VarMap[NameValPair[0]] = Val; |
| } |
| } |
| } |
| |
| 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"); |
| |
| std::vector<Instruction *> ToRemove; |
| |
| // 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. |
| for (User *U : ReflectFunction->users()) { |
| assert(isa<CallInst>(U) && "Only a call instruction can use _reflect"); |
| CallInst *Reflect = cast<CallInst>(U); |
| |
| 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); |
| if (isa<CallInst>(Str)) { |
| // CUDA path |
| const CallInst *ConvCall = cast<CallInst>(Str); |
| Str = ConvCall->getArgOperand(0); |
| } |
| assert(isa<ConstantExpr>(Str) && |
| "Format of _reflect function not recognized"); |
| const ConstantExpr *GEP = cast<ConstantExpr>(Str); |
| |
| const Value *Sym = GEP->getOperand(0); |
| assert(isa<Constant>(Sym) && "Format of _reflect function not recognized"); |
| |
| const Constant *SymStr = cast<Constant>(Sym); |
| |
| assert(isa<ConstantDataSequential>(SymStr->getOperand(0)) && |
| "Format of _reflect function not recognized"); |
| |
| assert(cast<ConstantDataSequential>(SymStr->getOperand(0))->isCString() && |
| "Format of _reflect function not recognized"); |
| |
| std::string ReflectArg = |
| cast<ConstantDataSequential>(SymStr->getOperand(0))->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); |
| } |
| } |
| |
| 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); |
| |
| return Res; |
| } |