#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Function.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Transforms/Utils/ValueMapper.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/ADT/SmallVector.h"
#include <map>
using namespace llvm;
BasicBlock *llvm::CloneBasicBlock(const BasicBlock *BB,
DenseMap<const Value*, Value*> &ValueMap,
const char *NameSuffix, Function *F,
ClonedCodeInfo *CodeInfo) {
BasicBlock *NewBB = BasicBlock::Create("", F);
if (BB->hasName()) NewBB->setName(BB->getName()+NameSuffix);
bool hasCalls = false, hasDynamicAllocas = false, hasStaticAllocas = false;
for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end();
II != IE; ++II) {
Instruction *NewInst = II->clone();
if (II->hasName())
NewInst->setName(II->getName()+NameSuffix);
NewBB->getInstList().push_back(NewInst);
ValueMap[II] = NewInst;
hasCalls |= (isa<CallInst>(II) && !isa<DbgInfoIntrinsic>(II));
if (const AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
if (isa<ConstantInt>(AI->getArraySize()))
hasStaticAllocas = true;
else
hasDynamicAllocas = true;
}
}
if (CodeInfo) {
CodeInfo->ContainsCalls |= hasCalls;
CodeInfo->ContainsUnwinds |= isa<UnwindInst>(BB->getTerminator());
CodeInfo->ContainsDynamicAllocas |= hasDynamicAllocas;
CodeInfo->ContainsDynamicAllocas |= hasStaticAllocas &&
BB != &BB->getParent()->getEntryBlock();
}
return NewBB;
}
void llvm::CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
DenseMap<const Value*, Value*> &ValueMap,
std::vector<ReturnInst*> &Returns,
const char *NameSuffix, ClonedCodeInfo *CodeInfo) {
assert(NameSuffix && "NameSuffix cannot be null!");
#ifndef NDEBUG
for (Function::const_arg_iterator I = OldFunc->arg_begin(),
E = OldFunc->arg_end(); I != E; ++I)
assert(ValueMap.count(I) && "No mapping from source argument specified!");
#endif
if (NewFunc->arg_size() == OldFunc->arg_size())
NewFunc->copyAttributesFrom(OldFunc);
else {
for (Function::const_arg_iterator I = OldFunc->arg_begin(),
E = OldFunc->arg_end(); I != E; ++I)
if (Argument* Anew = dyn_cast<Argument>(ValueMap[I]))
Anew->addAttr( OldFunc->getAttributes()
.getParamAttributes(I->getArgNo() + 1));
NewFunc->setAttributes(NewFunc->getAttributes()
.addAttr(0, OldFunc->getAttributes()
.getRetAttributes()));
NewFunc->setAttributes(NewFunc->getAttributes()
.addAttr(~0, OldFunc->getAttributes()
.getFnAttributes()));
}
for (Function::const_iterator BI = OldFunc->begin(), BE = OldFunc->end();
BI != BE; ++BI) {
const BasicBlock &BB = *BI;
BasicBlock *CBB = CloneBasicBlock(&BB, ValueMap, NameSuffix, NewFunc,
CodeInfo);
ValueMap[&BB] = CBB;
if (ReturnInst *RI = dyn_cast<ReturnInst>(CBB->getTerminator()))
Returns.push_back(RI);
}
for (Function::iterator BB = cast<BasicBlock>(ValueMap[OldFunc->begin()]),
BE = NewFunc->end(); BB != BE; ++BB)
for (BasicBlock::iterator II = BB->begin(); II != BB->end(); ++II)
RemapInstruction(II, ValueMap);
}
Function *llvm::CloneFunction(const Function *F,
DenseMap<const Value*, Value*> &ValueMap,
ClonedCodeInfo *CodeInfo) {
std::vector<const Type*> ArgTypes;
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I)
if (ValueMap.count(I) == 0) ArgTypes.push_back(I->getType());
FunctionType *FTy = FunctionType::get(F->getFunctionType()->getReturnType(),
ArgTypes, F->getFunctionType()->isVarArg());
Function *NewF = Function::Create(FTy, F->getLinkage(), F->getName());
Function::arg_iterator DestI = NewF->arg_begin();
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I)
if (ValueMap.count(I) == 0) { DestI->setName(I->getName()); ValueMap[I] = DestI++; }
std::vector<ReturnInst*> Returns; CloneFunctionInto(NewF, F, ValueMap, Returns, "", CodeInfo);
return NewF;
}
namespace {
struct VISIBILITY_HIDDEN PruningFunctionCloner {
Function *NewFunc;
const Function *OldFunc;
DenseMap<const Value*, Value*> &ValueMap;
std::vector<ReturnInst*> &Returns;
const char *NameSuffix;
ClonedCodeInfo *CodeInfo;
const TargetData *TD;
Value *DbgFnStart;
public:
PruningFunctionCloner(Function *newFunc, const Function *oldFunc,
DenseMap<const Value*, Value*> &valueMap,
std::vector<ReturnInst*> &returns,
const char *nameSuffix,
ClonedCodeInfo *codeInfo,
const TargetData *td)
: NewFunc(newFunc), OldFunc(oldFunc), ValueMap(valueMap), Returns(returns),
NameSuffix(nameSuffix), CodeInfo(codeInfo), TD(td), DbgFnStart(NULL) {
}
void CloneBlock(const BasicBlock *BB,
std::vector<const BasicBlock*> &ToClone);
public:
Constant *ConstantFoldMappedInstruction(const Instruction *I);
};
}
void PruningFunctionCloner::CloneBlock(const BasicBlock *BB,
std::vector<const BasicBlock*> &ToClone){
Value *&BBEntry = ValueMap[BB];
if (BBEntry) return;
BasicBlock *NewBB;
BBEntry = NewBB = BasicBlock::Create();
if (BB->hasName()) NewBB->setName(BB->getName()+NameSuffix);
bool hasCalls = false, hasDynamicAllocas = false, hasStaticAllocas = false;
for (BasicBlock::const_iterator II = BB->begin(), IE = --BB->end();
II != IE; ++II) {
if (Constant *C = ConstantFoldMappedInstruction(II)) {
ValueMap[II] = C;
continue;
}
if (const DbgFuncStartInst *DFSI = dyn_cast<DbgFuncStartInst>(II)) {
if (DbgFnStart == NULL) {
DISubprogram SP(cast<GlobalVariable>(DFSI->getSubprogram()));
if (SP.describes(BB->getParent()))
DbgFnStart = DFSI->getSubprogram();
}
}
if (const DbgRegionEndInst *DREIS = dyn_cast<DbgRegionEndInst>(II)) {
if (DREIS->getContext() == DbgFnStart)
continue;
}
Instruction *NewInst = II->clone();
if (II->hasName())
NewInst->setName(II->getName()+NameSuffix);
NewBB->getInstList().push_back(NewInst);
ValueMap[II] = NewInst;
hasCalls |= (isa<CallInst>(II) && !isa<DbgInfoIntrinsic>(II));
if (const AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
if (isa<ConstantInt>(AI->getArraySize()))
hasStaticAllocas = true;
else
hasDynamicAllocas = true;
}
}
const TerminatorInst *OldTI = BB->getTerminator();
bool TerminatorDone = false;
if (const BranchInst *BI = dyn_cast<BranchInst>(OldTI)) {
if (BI->isConditional()) {
ConstantInt *Cond = dyn_cast<ConstantInt>(BI->getCondition());
if (Cond == 0)
Cond = dyn_cast_or_null<ConstantInt>(ValueMap[BI->getCondition()]);
if (Cond) {
BasicBlock *Dest = BI->getSuccessor(!Cond->getZExtValue());
ValueMap[OldTI] = BranchInst::Create(Dest, NewBB);
ToClone.push_back(Dest);
TerminatorDone = true;
}
}
} else if (const SwitchInst *SI = dyn_cast<SwitchInst>(OldTI)) {
ConstantInt *Cond = dyn_cast<ConstantInt>(SI->getCondition());
if (Cond == 0) Cond = dyn_cast_or_null<ConstantInt>(ValueMap[SI->getCondition()]);
if (Cond) { BasicBlock *Dest = SI->getSuccessor(SI->findCaseValue(Cond));
ValueMap[OldTI] = BranchInst::Create(Dest, NewBB);
ToClone.push_back(Dest);
TerminatorDone = true;
}
}
if (!TerminatorDone) {
Instruction *NewInst = OldTI->clone();
if (OldTI->hasName())
NewInst->setName(OldTI->getName()+NameSuffix);
NewBB->getInstList().push_back(NewInst);
ValueMap[OldTI] = NewInst;
const TerminatorInst *TI = BB->getTerminator();
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
ToClone.push_back(TI->getSuccessor(i));
}
if (CodeInfo) {
CodeInfo->ContainsCalls |= hasCalls;
CodeInfo->ContainsUnwinds |= isa<UnwindInst>(OldTI);
CodeInfo->ContainsDynamicAllocas |= hasDynamicAllocas;
CodeInfo->ContainsDynamicAllocas |= hasStaticAllocas &&
BB != &BB->getParent()->front();
}
if (ReturnInst *RI = dyn_cast<ReturnInst>(NewBB->getTerminator()))
Returns.push_back(RI);
}
Constant *PruningFunctionCloner::
ConstantFoldMappedInstruction(const Instruction *I) {
SmallVector<Constant*, 8> Ops;
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (Constant *Op = dyn_cast_or_null<Constant>(MapValue(I->getOperand(i),
ValueMap)))
Ops.push_back(Op);
else
return 0;
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
return ConstantFoldCompareInstOperands(CI->getPredicate(),
&Ops[0], Ops.size(), TD);
if (const LoadInst *LI = dyn_cast<LoadInst>(I))
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0]))
if (!LI->isVolatile() && CE->getOpcode() == Instruction::GetElementPtr)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && GV->hasDefinitiveInitializer())
return ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(),
CE);
return ConstantFoldInstOperands(I->getOpcode(), I->getType(), &Ops[0],
Ops.size(), TD);
}
void llvm::CloneAndPruneFunctionInto(Function *NewFunc, const Function *OldFunc,
DenseMap<const Value*, Value*> &ValueMap,
std::vector<ReturnInst*> &Returns,
const char *NameSuffix,
ClonedCodeInfo *CodeInfo,
const TargetData *TD) {
assert(NameSuffix && "NameSuffix cannot be null!");
#ifndef NDEBUG
for (Function::const_arg_iterator II = OldFunc->arg_begin(),
E = OldFunc->arg_end(); II != E; ++II)
assert(ValueMap.count(II) && "No mapping from source argument specified!");
#endif
PruningFunctionCloner PFC(NewFunc, OldFunc, ValueMap, Returns,
NameSuffix, CodeInfo, TD);
std::vector<const BasicBlock*> CloneWorklist;
CloneWorklist.push_back(&OldFunc->getEntryBlock());
while (!CloneWorklist.empty()) {
const BasicBlock *BB = CloneWorklist.back();
CloneWorklist.pop_back();
PFC.CloneBlock(BB, CloneWorklist);
}
std::vector<const PHINode*> PHIToResolve;
for (Function::const_iterator BI = OldFunc->begin(), BE = OldFunc->end();
BI != BE; ++BI) {
BasicBlock *NewBB = cast_or_null<BasicBlock>(ValueMap[BI]);
if (NewBB == 0) continue;
NewFunc->getBasicBlockList().push_back(NewBB);
BasicBlock::iterator I = NewBB->begin();
if (PHINode *PN = dyn_cast<PHINode>(I)) {
BasicBlock::const_iterator OldI = BI->begin();
for (; (PN = dyn_cast<PHINode>(I)); ++I, ++OldI)
PHIToResolve.push_back(cast<PHINode>(OldI));
}
for (; I != NewBB->end(); ++I)
RemapInstruction(I, ValueMap);
}
for (unsigned phino = 0, e = PHIToResolve.size(); phino != e; ) {
const PHINode *OPN = PHIToResolve[phino];
unsigned NumPreds = OPN->getNumIncomingValues();
const BasicBlock *OldBB = OPN->getParent();
BasicBlock *NewBB = cast<BasicBlock>(ValueMap[OldBB]);
for (; phino != PHIToResolve.size() &&
PHIToResolve[phino]->getParent() == OldBB; ++phino) {
OPN = PHIToResolve[phino];
PHINode *PN = cast<PHINode>(ValueMap[OPN]);
for (unsigned pred = 0, e = NumPreds; pred != e; ++pred) {
if (BasicBlock *MappedBlock =
cast_or_null<BasicBlock>(ValueMap[PN->getIncomingBlock(pred)])) {
Value *InVal = MapValue(PN->getIncomingValue(pred), ValueMap);
assert(InVal && "Unknown input value?");
PN->setIncomingValue(pred, InVal);
PN->setIncomingBlock(pred, MappedBlock);
} else {
PN->removeIncomingValue(pred, false);
--pred, --e; }
}
}
PHINode *PN = cast<PHINode>(NewBB->begin());
NumPreds = std::distance(pred_begin(NewBB), pred_end(NewBB));
if (NumPreds != PN->getNumIncomingValues()) {
assert(NumPreds < PN->getNumIncomingValues());
std::map<BasicBlock*, unsigned> PredCount;
for (pred_iterator PI = pred_begin(NewBB), E = pred_end(NewBB);
PI != E; ++PI)
--PredCount[*PI];
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
++PredCount[PN->getIncomingBlock(i)];
BasicBlock::iterator I = NewBB->begin();
for (; (PN = dyn_cast<PHINode>(I)); ++I) {
for (std::map<BasicBlock*, unsigned>::iterator PCI =PredCount.begin(),
E = PredCount.end(); PCI != E; ++PCI) {
BasicBlock *Pred = PCI->first;
for (unsigned NumToRemove = PCI->second; NumToRemove; --NumToRemove)
PN->removeIncomingValue(Pred, false);
}
}
}
PN = cast<PHINode>(NewBB->begin());
if (PN->getNumIncomingValues() == 0) {
BasicBlock::iterator I = NewBB->begin();
BasicBlock::const_iterator OldI = OldBB->begin();
while ((PN = dyn_cast<PHINode>(I++))) {
Value *NV = UndefValue::get(PN->getType());
PN->replaceAllUsesWith(NV);
assert(ValueMap[OldI] == PN && "ValueMap mismatch");
ValueMap[OldI] = NV;
PN->eraseFromParent();
++OldI;
}
}
}
Function::iterator I = cast<BasicBlock>(ValueMap[&OldFunc->getEntryBlock()]);
while (I != NewFunc->end()) {
BranchInst *BI = dyn_cast<BranchInst>(I->getTerminator());
if (!BI || BI->isConditional()) { ++I; continue; }
BasicBlock *Dest = BI->getSuccessor(0);
if (!Dest->getSinglePredecessor() || isa<PHINode>(Dest->begin())) {
++I; continue;
}
BI->eraseFromParent();
I->getInstList().splice(I->end(), Dest->getInstList());
Dest->replaceAllUsesWith(I);
Dest->eraseFromParent();
}
}