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219 changes: 219 additions & 0 deletions
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libclambcc/ClamBCConvertIntrinsicsTo32Bit/ClamBCConvertIntrinsicsTo32Bit.cpp
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| #include <llvm/Pass.h> | ||
| #include <llvm/IR/Function.h> | ||
| #include <llvm/IR/Module.h> | ||
| #include <llvm/IR/Instructions.h> | ||
| #include <llvm/Support/raw_ostream.h> | ||
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| #include <llvm/IR/DerivedTypes.h> | ||
| #include <llvm/IR/PassManager.h> | ||
| #include <llvm/Passes/PassBuilder.h> | ||
| #include <llvm/Passes/PassPlugin.h> | ||
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| #include <llvm/IR/Dominators.h> | ||
| #include <llvm/IR/Constants.h> | ||
| #include <llvm/Transforms/IPO/PassManagerBuilder.h> | ||
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| #include "Common/clambc.h" | ||
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| #include <vector> | ||
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| using namespace llvm; | ||
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| namespace ClamBCConvertIntrinsicsTo32Bit { | ||
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| class ClamBCConvertIntrinsicsTo32Bit : public PassInfoMixin<ClamBCConvertIntrinsicsTo32Bit > | ||
| { | ||
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| public: | ||
| static char ID; | ||
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| ClamBCConvertIntrinsicsTo32Bit() {} | ||
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| virtual ~ClamBCConvertIntrinsicsTo32Bit() {} | ||
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| PreservedAnalyses run(Module & mod, ModuleAnalysisManager & MAM) | ||
| { | ||
| bChanged = false; | ||
| pMod = &mod; | ||
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| initializeReplacements(); | ||
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| for (auto i = pMod->begin(), e = pMod->end(); i != e; i++) { | ||
| Function* pFunc = llvm::cast<Function>(i); | ||
| processFunction(pFunc); | ||
| } | ||
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| for (size_t i = 0; i < delLst.size(); i++) { | ||
| delLst[i]->eraseFromParent(); | ||
| } | ||
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| if (bChanged){ | ||
| return PreservedAnalyses::none(); | ||
| } | ||
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| return PreservedAnalyses::all(); | ||
| } | ||
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| protected: | ||
| Module* pMod = nullptr; | ||
| bool bChanged = false; | ||
| std::vector<CallInst*> delLst; | ||
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| typedef struct { | ||
| llvm::Function * oldFunc; | ||
| llvm::FunctionCallee newFunc; | ||
| const size_t paramIdx; | ||
| } Replacement; | ||
| std::vector< Replacement> replacements; | ||
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| llvm::FunctionType* getMemset32Type() | ||
| { | ||
| LLVMContext& c = pMod->getContext(); | ||
| return FunctionType::get(Type::getVoidTy(c), | ||
| {Type::getInt8PtrTy(c), Type::getInt8Ty(c), Type::getInt32Ty(c), Type::getInt1Ty(c)}, | ||
| false); | ||
| } | ||
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| llvm::FunctionType* getMemcpy32Type() | ||
| { | ||
| LLVMContext& c = pMod->getContext(); | ||
| return FunctionType::get(Type::getVoidTy(c), | ||
| {Type::getInt8PtrTy(c), Type::getInt8PtrTy(c), Type::getInt32Ty(c), Type::getInt1Ty(c)}, | ||
| false); | ||
| } | ||
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| llvm::FunctionType* getMemmove32Type() | ||
| { | ||
| LLVMContext& c = pMod->getContext(); | ||
| return FunctionType::get(Type::getVoidTy(c), | ||
| {Type::getInt8PtrTy(c), Type::getInt8PtrTy(c), Type::getInt32Ty(c), Type::getInt1Ty(c)}, | ||
| false); | ||
| } | ||
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| void initializeReplacements(){ | ||
| /*There are different calls when you use the -no-opaque flags.*/ | ||
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| /*memsets*/ | ||
| FunctionType * ft = getMemset32Type(); | ||
| Function * pFunc = pMod->getFunction( "llvm.memset.p0i8.i64"); | ||
| if (pFunc){ | ||
| FunctionCallee rep = pMod->getOrInsertFunction("llvm.memset.p0i8.i32", ft); | ||
| replacements.push_back( {pFunc, rep, 2} ); | ||
| } | ||
| pFunc = pMod->getFunction( "llvm.memset.p0.i64"); | ||
| if (pFunc){ | ||
| FunctionCallee rep = pMod->getOrInsertFunction("llvm.memset.p0.i32", ft); | ||
| replacements.push_back( {pFunc, rep, 2}); | ||
| } | ||
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| /*memcpys*/ | ||
| ft = getMemcpy32Type(); | ||
| pFunc = pMod->getFunction("llvm.memcpy.p0i8.p0i8.i64"); | ||
| if (pFunc){ | ||
| FunctionCallee rep = pMod->getOrInsertFunction("llvm.memcpy.p0i8.p0i8.i32", ft); | ||
| replacements.push_back( {pFunc, rep, 2}); | ||
| } | ||
| pFunc = pMod->getFunction("llvm.memcpy.p0.p0.i64"); | ||
| if (pFunc){ | ||
| FunctionCallee rep = pMod->getOrInsertFunction("llvm.memcpy.p0.p0.i32", ft); | ||
| replacements.push_back( {pFunc, rep, 2}); | ||
| } | ||
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| /*memmoves*/ | ||
| ft = getMemmove32Type(); | ||
| pFunc = pMod->getFunction("llvm.memmove.p0.p0.i64"); | ||
| if (pFunc){ | ||
| FunctionCallee rep = pMod->getOrInsertFunction("llvm.memmove.p0.p0.i32", ft); | ||
| replacements.push_back( {pFunc, rep, 2}); | ||
| } | ||
| pFunc = pMod->getFunction("llvm.memmove.p0i8.p0i8.i64"); | ||
| if (pFunc){ | ||
| FunctionCallee rep = pMod->getOrInsertFunction("llvm.memmove.p0i8.p0i8.i32", ft); | ||
| replacements.push_back( {pFunc, rep, 2}); | ||
| } | ||
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| } | ||
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| void processFunction(Function* pFunc) | ||
| { | ||
| for (auto i = pFunc->begin(), e = pFunc->end(); i != e; i++) { | ||
| BasicBlock* pBB = llvm::cast<BasicBlock>(i); | ||
| processBasicBlock(pBB); | ||
| } | ||
| } | ||
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| void processBasicBlock(BasicBlock* pBB) | ||
| { | ||
| for (auto i = pBB->begin(), e = pBB->end(); i != e; i++) { | ||
| if (CallInst* pci = llvm::dyn_cast<CallInst>(i)) { | ||
| Function * f = pci->getCalledFunction(); | ||
| if (nullptr != f) { | ||
| for (size_t i = 0; i < replacements.size(); i++){ | ||
| if (replacements[i].oldFunc == f) { | ||
| convertCall(pci, replacements[i]); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| void convertCall(CallInst* pci, const Replacement & r) | ||
| { | ||
| std::vector<Value*> args; | ||
| Type* i32Ty = Type::getInt32Ty(pMod->getContext()); | ||
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| for (size_t i = 0; i < pci->arg_size(); i++) | ||
| { | ||
| Value* pv = pci->getArgOperand(i); | ||
| if (r.paramIdx == i) { | ||
| if (ConstantInt* ci = llvm::dyn_cast<ConstantInt>(pv)) { | ||
| pv = ConstantInt::get(i32Ty, ci->getValue().getLimitedValue()); | ||
| } else { | ||
| pv = CastInst::CreateTruncOrBitCast(pv, i32Ty, "ClamBCConvertIntrinsicsTo32Bit_trunc_", pci); | ||
| } | ||
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| pci->setArgOperand(i, pv); | ||
| } | ||
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| // args.push_back(pv); | ||
| } | ||
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| //FunctionCallee f = pMod->getOrInsertFunction(newName, ); | ||
| pci->setCalledFunction(r.newFunc); | ||
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| // CallInst * pNew = CallInst::Create(f, args, "", pci); | ||
| // pNew->setAttributes(pci->getAttributes()); | ||
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| // delLst.push_back(pci); | ||
| } | ||
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| }; | ||
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| } // end of anonymous namespace | ||
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| // This part is the new way of registering your pass | ||
| extern "C" ::llvm::PassPluginLibraryInfo LLVM_ATTRIBUTE_WEAK | ||
| llvmGetPassPluginInfo() { | ||
| return { | ||
| LLVM_PLUGIN_API_VERSION, "ClamBCConvertIntrinsicsTo32Bit", "v0.1", | ||
| [](PassBuilder &PB) { | ||
| PB.registerPipelineParsingCallback( | ||
| [](StringRef Name, ModulePassManager &FPM, | ||
| ArrayRef<PassBuilder::PipelineElement>) { | ||
| if(Name == "clambc-convert-intrinsics-to-32Bit"){ | ||
| FPM.addPass(ClamBCConvertIntrinsicsTo32Bit::ClamBCConvertIntrinsicsTo32Bit()); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
| ); | ||
| } | ||
| }; | ||
| } | ||
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