18using namespace CodeGen;
20static llvm::GlobalVariable *
24 llvm::GlobalVariable::LinkageTypes
Linkage,
26 if (VTable.
getBase() == MostDerivedClass) {
28 "Most derived class vtable must have a zero offset!");
42 llvm::GlobalVariable::LinkageTypes
Linkage,
46 llvm::ArrayType::get(CGM.
Int8PtrTy, Builder.getVTTComponents().size());
50 for (
const VTTVTable *i = Builder.getVTTVTables().begin(),
51 *e = Builder.getVTTVTables().end(); i != e; ++i) {
52 VTableAddressPoints.push_back(VTableAddressPointsMapTy());
54 VTableAddressPoints.back()));
58 for (
const VTTComponent *i = Builder.getVTTComponents().begin(),
59 *e = Builder.getVTTComponents().end(); i != e; ++i) {
60 const VTTVTable &VTTVT = Builder.getVTTVTables()[i->VTableIndex];
61 llvm::GlobalVariable *VTable = VTables[i->VTableIndex];
69 AddressPoint = VTableAddressPoints[i->VTableIndex].lookup(i->VTableBase);
71 "Did not find ctor vtable address point!");
74 llvm::Value *Idxs[] = {
75 llvm::ConstantInt::get(CGM.
Int32Ty, 0),
80 llvm::Constant *Init = llvm::ConstantExpr::getGetElementPtr(
81 VTable->getValueType(), VTable, Idxs,
true,
84 Init = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(Init,
87 VTTComponents.push_back(Init);
90 llvm::Constant *Init = llvm::ConstantArray::get(
ArrayType, VTTComponents);
92 VTT->setInitializer(Init);
98 VTT->setComdat(CGM.
getModule().getOrInsertComdat(VTT->getName()));
102 assert(RD->
getNumVBases() &&
"Only classes with virtual bases need a VTT");
105 llvm::raw_svector_ostream Out(OutName);
107 .mangleCXXVTT(RD, Out);
108 StringRef Name = OutName.str();
116 llvm::ArrayType::get(CGM.
Int8PtrTy, Builder.getVTTComponents().size());
120 Name,
ArrayType, llvm::GlobalValue::ExternalLinkage, Align);
121 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
128 BaseSubobjectPairTy ClassSubobjectPair(RD,
Base);
130 SubVTTIndiciesMapTy::iterator I = SubVTTIndicies.find(ClassSubobjectPair);
131 if (I != SubVTTIndicies.end())
136 for (llvm::DenseMap<BaseSubobject, uint64_t>::const_iterator I =
137 Builder.getSubVTTIndicies().begin(),
138 E = Builder.getSubVTTIndicies().end(); I != E; ++I) {
140 BaseSubobjectPairTy ClassSubobjectPair(RD, I->first);
142 SubVTTIndicies.insert(std::make_pair(ClassSubobjectPair, I->second));
145 I = SubVTTIndicies.find(ClassSubobjectPair);
146 assert(I != SubVTTIndicies.end() &&
"Did not find index!");
154 SecondaryVirtualPointerIndicesMapTy::iterator I =
155 SecondaryVirtualPointerIndices.find(std::make_pair(RD,
Base));
157 if (I != SecondaryVirtualPointerIndices.end())
163 for (llvm::DenseMap<BaseSubobject, uint64_t>::const_iterator I =
164 Builder.getSecondaryVirtualPointerIndices().begin(),
165 E = Builder.getSecondaryVirtualPointerIndices().end(); I != E; ++I) {
166 std::pair<const CXXRecordDecl *, BaseSubobject> Pair =
167 std::make_pair(RD, I->first);
169 SecondaryVirtualPointerIndices.insert(std::make_pair(Pair, I->second));
172 I = SecondaryVirtualPointerIndices.find(std::make_pair(RD,
Base));
173 assert(I != SecondaryVirtualPointerIndices.end() &&
"Did not find index!");
static llvm::GlobalVariable * GetAddrOfVTTVTable(CodeGenVTables &CGVT, CodeGenModule &CGM, const CXXRecordDecl *MostDerivedClass, const VTTVTable &VTable, llvm::GlobalVariable::LinkageTypes Linkage, VTableLayout::AddressPointsMapTy &AddressPoints)
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Represents a C++ struct/union/class.
unsigned getNumVBases() const
Retrieves the number of virtual base classes of this class.
CharUnits - This is an opaque type for sizes expressed in character units.
bool isZero() const
isZero - Test whether the quantity equals zero.
virtual llvm::GlobalVariable * getAddrOfVTable(const CXXRecordDecl *RD, CharUnits VPtrOffset)=0
Get the address of the vtable for the given record decl which should be used for the vptr at the give...
MangleContext & getMangleContext()
Gets the mangle context.
This class organizes the cross-function state that is used while generating LLVM code.
void setGVProperties(llvm::GlobalValue *GV, GlobalDecl GD) const
Set visibility, dllimport/dllexport and dso_local.
llvm::Module & getModule() const
const llvm::DataLayout & getDataLayout() const
CGCXXABI & getCXXABI() const
ASTContext & getContext() const
bool supportsCOMDAT() const
llvm::GlobalVariable * CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty, llvm::GlobalValue::LinkageTypes Linkage, llvm::Align Alignment)
Will return a global variable of the given type.
llvm::GlobalVariable * GetAddrOfVTT(const CXXRecordDecl *RD)
GetAddrOfVTT - Get the address of the VTT for the given record decl.
uint64_t getSubVTTIndex(const CXXRecordDecl *RD, BaseSubobject Base)
getSubVTTIndex - Return the index of the sub-VTT for the base class of the given record decl.
ItaniumVTableContext & getItaniumVTableContext()
llvm::GlobalVariable * GenerateConstructionVTable(const CXXRecordDecl *RD, const BaseSubobject &Base, bool BaseIsVirtual, llvm::GlobalVariable::LinkageTypes Linkage, VTableAddressPointsMapTy &AddressPoints)
GenerateConstructionVTable - Generate a construction vtable for the given base subobject.
uint64_t getSecondaryVirtualPointerIndex(const CXXRecordDecl *RD, BaseSubobject Base)
getSecondaryVirtualPointerIndex - Return the index in the VTT where the virtual pointer for the given...
void EmitVTTDefinition(llvm::GlobalVariable *VTT, llvm::GlobalVariable::LinkageTypes Linkage, const CXXRecordDecl *RD)
EmitVTTDefinition - Emit the definition of the given vtable.
const VTableLayout & getVTableLayout(const CXXRecordDecl *RD)
Class for building VTT layout information.
CharUnits getBaseOffset() const
const CXXRecordDecl * getBase() const
BaseSubobject getBaseSubobject() const
llvm::DenseMap< BaseSubobject, AddressPointLocation > AddressPointsMapTy
AddressPointLocation getAddressPoint(BaseSubobject Base) const
Linkage
Describes the different kinds of linkage (C++ [basic.link], C99 6.2.2) that an entity may have.
llvm::IntegerType * Int32Ty
llvm::PointerType * Int8PtrTy
unsigned AddressPointIndex