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Handle pure virtual member functions. 

llvm-svn: 99807
This commit is contained in:
Anders Carlsson 2010-03-29 05:40:50 +00:00
parent abb20e6249
commit cb6207f723
1 changed files with 33 additions and 16 deletions
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49
clang/lib/CodeGen/CGVtable.cpp
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@ -4049,6 +4049,8 @@ CodeGenVTables::CreateVTableInitializer(const CXXRecordDecl *RD,
unsigned NextVTableThunkIndex = 0;
llvm::Constant* PureVirtualFn = 0;
for (unsigned I = 0; I != NumComponents; ++I) {
VtableComponent Component =
VtableComponent::getFromOpaqueInteger(Components[I]);
@ -4091,22 +4093,37 @@ CodeGenVTables::CreateVTableInitializer(const CXXRecordDecl *RD,
break;
}
// Check if we should use a thunk.
if (NextVTableThunkIndex < VTableThunks.size() &&
VTableThunks[NextVTableThunkIndex].first == I) {
const ThunkInfo &Thunk = VTableThunks[NextVTableThunkIndex].second;
if (cast<CXXMethodDecl>(GD.getDecl())->isPure()) {
// We have a pure virtual member function.
if (!PureVirtualFn) {
const llvm::FunctionType *Ty =
llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
/*isVarArg=*/false);
PureVirtualFn =
CGM.CreateRuntimeFunction(Ty, "__cxa_pure_virtual");
PureVirtualFn = llvm::ConstantExpr::getBitCast(PureVirtualFn,
Int8PtrTy);
}
Init = CGM.GetAddrOfThunk(GD, Thunk);
NextVTableThunkIndex++;
Init = PureVirtualFn;
} else {
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
const llvm::Type *Ty = CGM.getTypes().GetFunctionTypeForVtable(MD);
// Check if we should use a thunk.
if (NextVTableThunkIndex < VTableThunks.size() &&
VTableThunks[NextVTableThunkIndex].first == I) {
const ThunkInfo &Thunk = VTableThunks[NextVTableThunkIndex].second;
Init = CGM.GetAddrOfFunction(GD, Ty);
Init = CGM.GetAddrOfThunk(GD, Thunk);
NextVTableThunkIndex++;
} else {
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
const llvm::Type *Ty = CGM.getTypes().GetFunctionTypeForVtable(MD);
Init = CGM.GetAddrOfFunction(GD, Ty);
}
Init = llvm::ConstantExpr::getBitCast(Init, Int8PtrTy);
}
Init = llvm::ConstantExpr::getBitCast(Init, Int8PtrTy);
break;
}
@ -4137,11 +4154,8 @@ GetGlobalVariable(llvm::Module &Module, llvm::StringRef Name,
if (GV) {
// Check if the variable has the right type.
if (GV->getType()->getElementType() == Ty) {
// Set the correct linkage.
GV->setLinkage(Linkage);
if (GV->getType()->getElementType() == Ty)
return GV;
}
assert(GV->isDeclaration() && "Declaration has wrong type!");
@ -4221,6 +4235,9 @@ CodeGenVTables::EmitVTableDefinition(llvm::GlobalVariable *VTable,
CreateVTableInitializer(RD, getVTableComponentsData(RD),
getNumVTableComponents(RD), Thunks);
VTable->setInitializer(Init);
// Set the correct linkage.
VTable->setLinkage(Linkage);
}
llvm::GlobalVariable *