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Change the interface to Module::getOrInsertFunction to be easier to use,to resolve PR1088, and to help PR411.

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This simplifies many clients also


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32989 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-01-07 08:12:01 +00:00
parent 70d130516a
commit b76efb71d4
4 changed files with 118 additions and 255 deletions
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64
lib/Transforms/Utils/LowerAllocations.cpp
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@ -32,8 +32,8 @@ namespace {
/// %free calls.
///
class VISIBILITY_HIDDEN LowerAllocations : public BasicBlockPass {
Function *MallocFunc; // Functions in the module we are processing
Function *FreeFunc; // Initialized by doInitialization
Constant *MallocFunc; // Functions in the module we are processing
Constant *FreeFunc; // Initialized by doInitialization
bool LowerMallocArgToInteger;
public:
LowerAllocations(bool LowerToInt = false)
@ -84,19 +84,12 @@ FunctionPass *llvm::createLowerAllocationsPass(bool LowerMallocArgToInteger) {
// This function is always successful.
//
bool LowerAllocations::doInitialization(Module &M) {
const Type *SBPTy = PointerType::get(Type::Int8Ty);
MallocFunc = M.getNamedFunction("malloc");
FreeFunc = M.getNamedFunction("free");
if (MallocFunc == 0) {
// Prototype malloc as "void* malloc(...)", because we don't know in
// doInitialization whether size_t is int or long.
FunctionType *FT = FunctionType::get(SBPTy,std::vector<const Type*>(),true);
MallocFunc = M.getOrInsertFunction("malloc", FT);
}
if (FreeFunc == 0)
FreeFunc = M.getOrInsertFunction("free" , Type::VoidTy, SBPTy, (Type *)0);
const Type *BPTy = PointerType::get(Type::Int8Ty);
// Prototype malloc as "char* malloc(...)", because we don't know in
// doInitialization whether size_t is int or long.
FunctionType *FT = FunctionType::get(BPTy, std::vector<const Type*>(), true);
MallocFunc = M.getOrInsertFunction("malloc", FT);
FreeFunc = M.getOrInsertFunction("free" , Type::VoidTy, BPTy, (Type *)0);
return true;
}
@ -145,27 +138,8 @@ bool LowerAllocations::runOnBasicBlock(BasicBlock &BB) {
}
}
const FunctionType *MallocFTy = MallocFunc->getFunctionType();
std::vector<Value*> MallocArgs;
if (MallocFTy->getNumParams() > 0 || MallocFTy->isVarArg()) {
if (MallocFTy->isVarArg()) {
if (MallocArg->getType() != IntPtrTy)
MallocArg = CastInst::createIntegerCast(MallocArg, IntPtrTy,
false /*ZExt*/, "", I);
} else if (MallocFTy->getNumParams() > 0 &&
MallocFTy->getParamType(0) != Type::Int32Ty)
MallocArg = CastInst::createIntegerCast(
MallocArg, MallocFTy->getParamType(0), false/*ZExt*/, "",I);
MallocArgs.push_back(MallocArg);
}
// If malloc is prototyped to take extra arguments, pass nulls.
for (unsigned i = 1; i < MallocFTy->getNumParams(); ++i)
MallocArgs.push_back(Constant::getNullValue(MallocFTy->getParamType(i)));
// Create the call to Malloc...
CallInst *MCall = new CallInst(MallocFunc, MallocArgs, "", I);
// Create the call to Malloc.
CallInst *MCall = new CallInst(MallocFunc, MallocArg, "", I);
MCall->setTailCall();
// Create a cast instruction to convert to the right type...
@ -181,23 +155,11 @@ bool LowerAllocations::runOnBasicBlock(BasicBlock &BB) {
Changed = true;
++NumLowered;
} else if (FreeInst *FI = dyn_cast<FreeInst>(I)) {
const FunctionType *FreeFTy = FreeFunc->getFunctionType();
std::vector<Value*> FreeArgs;
if (FreeFTy->getNumParams() > 0 || FreeFTy->isVarArg()) {
Value *MCast = FI->getOperand(0);
if (FreeFTy->getNumParams() > 0 &&
FreeFTy->getParamType(0) != MCast->getType())
MCast = new BitCastInst(MCast, FreeFTy->getParamType(0), "", I);
FreeArgs.push_back(MCast);
}
// If malloc is prototyped to take extra arguments, pass nulls.
for (unsigned i = 1; i < FreeFTy->getNumParams(); ++i)
FreeArgs.push_back(Constant::getNullValue(FreeFTy->getParamType(i)));
Value *PtrCast = new BitCastInst(FI->getOperand(0),
PointerType::get(Type::Int8Ty), "", I);
// Insert a call to the free function...
(new CallInst(FreeFunc, FreeArgs, "", I))->setTailCall();
(new CallInst(FreeFunc, PtrCast, "", I))->setTailCall();
// Delete the old free instruction
I = --BBIL.erase(I);