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Merge branch 'CLAM-1496-LLVM-sigmanager_source.c' into 'main'
Fix parameter verification and PHI node not at top of block errors See merge request clamav/clamav-bytecode-compiler!21
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libclambcc/ClamBCExtendPHIsTo64Bit/ClamBCExtendPHIsTo64Bit.cpp
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| /* | ||
| * Compile LLVM bytecode to ClamAV bytecode. | ||
| * | ||
| * Copyright (C) 2009-2010 Sourcefire, Inc. | ||
| * | ||
| * Authors: Andy Ragusa | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | ||
| * MA 02110-1301, USA. | ||
| */ | ||
| #include "../Common/bytecode_api.h" | ||
| #include "clambc.h" | ||
| #include "ClamBCModule.h" | ||
| #include "ClamBCAnalyzer/ClamBCAnalyzer.h" | ||
| #include "Common/ClamBCUtilities.h" | ||
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|
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| #include <llvm/Support/DataTypes.h> | ||
| //#include "ClamBCTargetMachine.h" | ||
| #include <llvm/ADT/STLExtras.h> | ||
| #include <llvm/Analysis/ConstantFolding.h> | ||
| #include <llvm/IR/DebugInfo.h> | ||
| #include <llvm/IR/Dominators.h> | ||
| #include <llvm/Analysis/LoopInfo.h> | ||
| #include <llvm/Analysis/Passes.h> | ||
| #include <llvm/Analysis/ValueTracking.h> | ||
| #include <llvm/IR/Attributes.h> | ||
| #include <llvm/IR/CallingConv.h> | ||
| #include <llvm/CodeGen/IntrinsicLowering.h> | ||
| //#include "llvm/Config/config.h" | ||
| #include <llvm/IR/Constants.h> | ||
| #include <llvm/IR/DerivedTypes.h> | ||
| #include <llvm/IR/Instructions.h> | ||
| #include <llvm/IR/IntrinsicInst.h> | ||
| #include <llvm/IR/Intrinsics.h> | ||
| #include <llvm/IR/LLVMContext.h> | ||
| #include <llvm/IR/Metadata.h> | ||
| #include <llvm/IR/Module.h> | ||
| #include <llvm/Pass.h> | ||
|
|
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| #include <llvm/Analysis/ValueTracking.h> | ||
|
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| using namespace llvm; | ||
|
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| class ClamBCExtendPHIsTo64Bit : public ModulePass | ||
| { | ||
| protected: | ||
| llvm::Module *pMod = nullptr; | ||
|
|
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| virtual void convertPHIs(Function *pFunc) | ||
| { | ||
| std::vector<PHINode *> phis; | ||
| for (auto i = pFunc->begin(), e = pFunc->end(); i != e; i++) { | ||
| BasicBlock *bb = llvm::cast<BasicBlock>(i); | ||
| for (auto bi = bb->begin(), be = bb->end(); bi != be; bi++) { | ||
| if (PHINode *phi = llvm::dyn_cast<PHINode>(bi)) { | ||
| phis.push_back(phi); | ||
| } | ||
| } | ||
| } | ||
|
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| for (size_t i = 0; i < phis.size(); i++) { | ||
| convertPHI(phis[i]); | ||
| } | ||
| } | ||
|
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| virtual void convertPHI(PHINode *pn) | ||
| { | ||
| IntegerType *dstType = IntegerType::get(pMod->getContext(), 64); | ||
| IntegerType *origType = llvm::dyn_cast<IntegerType>(pn->getType()); | ||
| if ((dstType == origType) || (nullptr == origType)) { | ||
| return; | ||
| } | ||
|
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| PHINode *newNode = PHINode::Create(dstType, pn->getNumIncomingValues(), "ClamBCConvertPHINodes_", pn); | ||
| for (size_t i = 0; i < pn->getNumIncomingValues(); i++) { | ||
| Value *incomingValue = pn->getIncomingValue(i); | ||
| BasicBlock *incomingBlock = pn->getIncomingBlock(i); | ||
|
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| if (ConstantInt *ci = llvm::dyn_cast<ConstantInt>(incomingValue)) { | ||
| Constant *newCi = ConstantInt::get(dstType, ci->getLimitedValue()); | ||
| newNode->addIncoming(newCi, incomingBlock); | ||
| } else { | ||
| Instruction *insPt = llvm::cast<Instruction>(--(incomingBlock->end())); | ||
| Instruction *inst = CastInst::CreateIntegerCast(pn->getIncomingValue(i), dstType, true, "ClamBCConvertPHINodes_", insPt); | ||
|
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| newNode->addIncoming(inst, incomingBlock); | ||
| } | ||
| } | ||
| Instruction *insPt = nullptr; | ||
| for (auto i = pn->getParent()->begin(), e = pn->getParent()->end(); i != e; i++) { | ||
| if (llvm::isa<PHINode>(i)) { | ||
| continue; | ||
| } | ||
|
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| //Not allowed in bytecode sigs, but no reason not to support it. | ||
| if (llvm::isa<LandingPadInst>(i)) { | ||
| continue; | ||
| } | ||
|
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| insPt = llvm::cast<Instruction>(i); | ||
| break; | ||
| } | ||
|
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| Instruction *cast = CastInst::CreateIntegerCast(newNode, origType, true, "ClamBCConvertPHINodes_", insPt); | ||
| pn->replaceAllUsesWith(cast); | ||
| pn->eraseFromParent(); | ||
| } | ||
|
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| public: | ||
| static char ID; | ||
|
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| explicit ClamBCExtendPHIsTo64Bit() | ||
| : ModulePass(ID) {} | ||
|
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| virtual ~ClamBCExtendPHIsTo64Bit() {} | ||
|
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| virtual bool runOnModule(Module &m) | ||
| { | ||
|
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| pMod = &m; | ||
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| for (auto i = pMod->begin(), e = pMod->end(); i != e; i++) { | ||
| Function *pFunc = llvm::cast<Function>(i); | ||
| convertPHIs(pFunc); | ||
| } | ||
|
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| return true; | ||
| } | ||
| }; | ||
|
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| char ClamBCExtendPHIsTo64Bit::ID = 0; | ||
| static RegisterPass<ClamBCExtendPHIsTo64Bit> X("clambc-extend-phis-to-64bit", "ClamBCExtendPHIsTo64Bit Pass", | ||
| false /* Only looks at CFG */, | ||
| false /* Analysis Pass */); | ||
|
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| llvm::ModulePass *createClamBCExtendPHIsTo64Bit() | ||
| { | ||
| return new ClamBCExtendPHIsTo64Bit(); | ||
| } |
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