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Implement dynamic_cast<void*>(E). 

llvm-svn: 88988
This commit is contained in:
Mike Stump 2009-11-16 22:52:20 +00:00
parent 9b5eea30f7
commit 6ca0e21de4
1 changed files with 65 additions and 52 deletions
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117
clang/lib/CodeGen/CGCXXExpr.cpp
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@ -408,26 +408,14 @@ llvm::Value * CodeGenFunction::EmitCXXTypeidExpr(const CXXTypeidExpr *E) {
llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *V,
const CXXDynamicCastExpr *DCE) {
QualType CastTy = DCE->getTypeAsWritten();
QualType InnerType = CastTy->getPointeeType();
QualType ArgTy = DCE->getSubExpr()->getType();
const llvm::Type *LArgTy = ConvertType(ArgTy);
const llvm::Type *LTy = ConvertType(DCE->getType());
CXXRecordDecl *SrcTy;
CXXRecordDecl *DstTy;
QualType Ty = CastTy.getTypePtr()->getPointeeType();
CanQualType CanTy = CGM.getContext().getCanonicalType(Ty);
Ty = CanTy.getUnqualifiedType();
DstTy = cast<CXXRecordDecl>(Ty->getAs<RecordType>()->getDecl());
Ty = ArgTy;
if (ArgTy.getTypePtr()->isPointerType()
|| ArgTy.getTypePtr()->isReferenceType())
Ty = Ty.getTypePtr()->getPointeeType();
CanTy = CGM.getContext().getCanonicalType(Ty);
Ty = CanTy.getUnqualifiedType();
SrcTy = cast<CXXRecordDecl>(Ty->getAs<RecordType>()->getDecl());
bool CanBeZero = false;
bool ThrowOnBad = false;
bool ToVoid = false;
QualType InnerType = CastTy->getPointeeType();
bool ThrowOnBad = false;
if (CastTy->isPointerType()) {
// FIXME: if PointerType->hasAttr<NonNullAttr>(), we don't set this
CanBeZero = true;
@ -438,7 +426,14 @@ llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *V,
ThrowOnBad = true;
}
// FIXME: Add support for ToVoid
CXXRecordDecl *SrcTy;
QualType Ty = ArgTy;
if (ArgTy.getTypePtr()->isPointerType()
|| ArgTy.getTypePtr()->isReferenceType())
Ty = Ty.getTypePtr()->getPointeeType();
CanQualType CanTy = CGM.getContext().getCanonicalType(Ty);
Ty = CanTy.getUnqualifiedType();
SrcTy = cast<CXXRecordDecl>(Ty->getAs<RecordType>()->getDecl());
llvm::BasicBlock *ContBlock = createBasicBlock();
llvm::BasicBlock *NullBlock = 0;
@ -452,44 +447,62 @@ llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *V,
EmitBlock(NonZeroBlock);
}
/// Call __dynamic_cast
const llvm::Type *ResultType = llvm::Type::getInt8PtrTy(VMContext);
const llvm::FunctionType *FTy;
std::vector<const llvm::Type*> ArgTys;
const llvm::Type *PtrToInt8Ty
= llvm::Type::getInt8Ty(VMContext)->getPointerTo();
const llvm::Type *PtrDiffTy = ConvertType(getContext().getSizeType());
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrDiffTy);
FTy = llvm::FunctionType::get(ResultType, ArgTys, false);
// FIXME: Calculate better hint.
llvm::Value *hint = llvm::ConstantInt::get(PtrDiffTy, -1ULL);
llvm::Value *SrcArg = CGM.GenerateRttiRef(SrcTy);
llvm::Value *DstArg = CGM.GenerateRttiRef(DstTy);
V = Builder.CreateBitCast(V, PtrToInt8Ty);
V = Builder.CreateCall4(CGM.CreateRuntimeFunction(FTy, "__dynamic_cast"),
V, SrcArg, DstArg, hint);
V = Builder.CreateBitCast(V, LTy);
llvm::BasicBlock *BadCastBlock = 0;
if (ThrowOnBad) {
BadCastBlock = createBasicBlock();
llvm::Value *Zero = llvm::Constant::getNullValue(LTy);
Builder.CreateCondBr(Builder.CreateICmpNE(V, Zero),
ContBlock, BadCastBlock);
EmitBlock(BadCastBlock);
/// Call __cxa_bad_cast
ResultType = llvm::Type::getVoidTy(VMContext);
const llvm::FunctionType *FBadTy;
FTy = llvm::FunctionType::get(ResultType, false);
llvm::Value *F = CGM.CreateRuntimeFunction(FBadTy, "__cxa_bad_cast");
Builder.CreateCall(F)->setDoesNotReturn();
// Builder.CreateUnreachable();
const llvm::Type *PtrDiffTy = ConvertType(getContext().getSizeType());
// See if this is a dynamic_cast(void*)
if (ToVoid) {
llvm::Value *This = V;
V = Builder.CreateBitCast(This, PtrDiffTy->getPointerTo()->getPointerTo());
V = Builder.CreateLoad(V, "vtable");
V = Builder.CreateConstInBoundsGEP1_64(V, -2ULL);
V = Builder.CreateLoad(V, "offset to top");
This = Builder.CreateBitCast(This, llvm::Type::getInt8PtrTy(VMContext));
V = Builder.CreateInBoundsGEP(This, V);
V = Builder.CreateBitCast(V, LTy);
} else {
/// Call __dynamic_cast
const llvm::Type *ResultType = llvm::Type::getInt8PtrTy(VMContext);
const llvm::FunctionType *FTy;
std::vector<const llvm::Type*> ArgTys;
const llvm::Type *PtrToInt8Ty
= llvm::Type::getInt8Ty(VMContext)->getPointerTo();
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrToInt8Ty);
ArgTys.push_back(PtrDiffTy);
FTy = llvm::FunctionType::get(ResultType, ArgTys, false);
CXXRecordDecl *DstTy;
Ty = CastTy.getTypePtr()->getPointeeType();
CanTy = CGM.getContext().getCanonicalType(Ty);
Ty = CanTy.getUnqualifiedType();
DstTy = cast<CXXRecordDecl>(Ty->getAs<RecordType>()->getDecl());
// FIXME: Calculate better hint.
llvm::Value *hint = llvm::ConstantInt::get(PtrDiffTy, -1ULL);
llvm::Value *SrcArg = CGM.GenerateRttiRef(SrcTy);
llvm::Value *DstArg = CGM.GenerateRttiRef(DstTy);
V = Builder.CreateBitCast(V, PtrToInt8Ty);
V = Builder.CreateCall4(CGM.CreateRuntimeFunction(FTy, "__dynamic_cast"),
V, SrcArg, DstArg, hint);
V = Builder.CreateBitCast(V, LTy);
if (ThrowOnBad) {
BadCastBlock = createBasicBlock();
llvm::Value *Zero = llvm::Constant::getNullValue(LTy);
Builder.CreateCondBr(Builder.CreateICmpNE(V, Zero),
ContBlock, BadCastBlock);
EmitBlock(BadCastBlock);
/// Call __cxa_bad_cast
ResultType = llvm::Type::getVoidTy(VMContext);
const llvm::FunctionType *FBadTy;
FTy = llvm::FunctionType::get(ResultType, false);
llvm::Value *F = CGM.CreateRuntimeFunction(FBadTy, "__cxa_bad_cast");
Builder.CreateCall(F)->setDoesNotReturn();
// Builder.CreateUnreachable();
}
}
if (CanBeZero) {