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Factor vtable pointer setting code out into a separate function. 

llvm-svn: 99773
This commit is contained in:
Anders Carlsson 2010-03-28 19:40:00 +00:00
parent 32bdaef3fe
commit e87fae9afa
2 changed files with 45 additions and 22 deletions
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53
clang/lib/CodeGen/CGClass.cpp
View File

@ -139,7 +139,7 @@ CodeGenFunction::GetAddressOfBaseOfCompleteClass(llvm::Value *This,
V = Builder.CreateBitCast(V, ConvertType(Base)->getPointerTo());
return V;
}
}
llvm::Value *
CodeGenFunction::GetAddressOfBaseClass(llvm::Value *Value,
@ -1556,6 +1556,34 @@ CodeGenFunction::GetVirtualBaseClassOffset(llvm::Value *This,
return VBaseOffset;
}
void
CodeGenFunction::InitializeVTablePointer(BaseSubobject Base,
bool BaseIsMorallyVirtual,
llvm::Constant *VTable,
const CXXRecordDecl *VTableClass) {
// Compute the address point.
const CodeGenVTables::AddrSubMap_t& AddressPoints =
CGM.getVTables().getAddressPoints(VTableClass);
uint64_t AddressPoint =
AddressPoints.lookup(std::make_pair(Base.getBase(), Base.getBaseOffset()));
llvm::Value *VTableAddressPoint =
Builder.CreateConstInBoundsGEP2_64(VTable, 0, AddressPoint);
// Compute where to store the address point.
const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext());
llvm::Value *VTableField = Builder.CreateBitCast(LoadCXXThis(), Int8PtrTy);
VTableField =
Builder.CreateConstInBoundsGEP1_64(VTableField, Base.getBaseOffset() / 8);
// Finally, store the address point.
const llvm::Type *AddressPointPtrTy =
VTableAddressPoint->getType()->getPointerTo();
VTableField = Builder.CreateBitCast(VTableField, AddressPointPtrTy);
Builder.CreateStore(VTableAddressPoint, VTableField);
}
void CodeGenFunction::InitializeVtablePtrs(const CXXRecordDecl *RD) {
if (!RD->isDynamicClass())
return;
@ -1607,25 +1635,8 @@ void CodeGenFunction::InitializeVtablePtrs(BaseSubobject Base,
InitializeVtablePtrs(BaseSubobject(BaseDecl, BaseOffset),
VTable, VTableClass);
}
// Compute the address point.
const CodeGenVTables::AddrSubMap_t& AddressPoints =
CGM.getVTables().getAddressPoints(VTableClass);
uint64_t AddressPoint =
AddressPoints.lookup(std::make_pair(Base.getBase(), Base.getBaseOffset()));
llvm::Value *VTableAddressPoint =
Builder.CreateConstInBoundsGEP2_64(VTable, 0, AddressPoint);
// Compute where to store the address point.
const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext());
llvm::Value *VTableField = Builder.CreateBitCast(LoadCXXThis(), Int8PtrTy);
VTableField =
Builder.CreateConstInBoundsGEP1_64(VTableField, Base.getBaseOffset() / 8);
// Finally, store the address point.
const llvm::Type *AddressPointPtrTy =
VTableAddressPoint->getType()->getPointerTo();
VTableField = Builder.CreateBitCast(VTableField, AddressPointPtrTy);
Builder.CreateStore(VTableAddressPoint, VTableField);
// FIXME: BaseIsMorallyVirtual is not correct here.
InitializeVTablePointer(Base, /*BaseIsMorallyVirtual=*/false, VTable,
VTableClass);
}

14
clang/lib/CodeGen/CodeGenFunction.h
View File

@ -509,11 +509,23 @@ public:
void EmitCtorPrologue(const CXXConstructorDecl *CD, CXXCtorType Type);
void InitializeVtablePtrs(const CXXRecordDecl *ClassDecl);
/// InitializeVTablePointer - Initialize the vtable pointer of the given
/// subobject.
///
/// \param BaseIsMorallyVirtual - Whether the base subobject is a virtual base
/// or a direct or indirect base of a virtual base.
void InitializeVTablePointer(BaseSubobject Base, bool BaseIsMorallyVirtual,
llvm::Constant *VTable,
const CXXRecordDecl *VTableClass);
typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy;
void InitializeVtablePtrs(BaseSubobject Base, llvm::Constant *VTable,
const CXXRecordDecl *VTableClass);
void InitializeVtablePtrs(const CXXRecordDecl *ClassDecl);
void SynthesizeCXXCopyConstructor(const FunctionArgList &Args);
void SynthesizeCXXCopyAssignment(const FunctionArgList &Args);