clang  3.9.0
Public Member Functions | List of all members
clang::CodeGen::CodeGenVTables Class Reference

#include <CGVTables.h>

Public Member Functions

llvm::Constant * CreateVTableInitializer (const CXXRecordDecl *RD, const VTableComponent *Components, unsigned NumComponents, const VTableLayout::VTableThunkTy *VTableThunks, unsigned NumVTableThunks, llvm::Constant *RTTI)
 CreateVTableInitializer - Create a vtable initializer for the given record decl. More...
 
 CodeGenVTables (CodeGenModule &CGM)
 
ItaniumVTableContextgetItaniumVTableContext ()
 
MicrosoftVTableContextgetMicrosoftVTableContext ()
 
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. More...
 
uint64_t getSecondaryVirtualPointerIndex (const CXXRecordDecl *RD, BaseSubobject Base)
 getSecondaryVirtualPointerIndex - Return the index in the VTT where the virtual pointer for the given subobject is located. More...
 
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. More...
 
llvm::GlobalVariable * GetAddrOfVTT (const CXXRecordDecl *RD)
 GetAddrOfVTT - Get the address of the VTT for the given record decl. More...
 
void EmitVTTDefinition (llvm::GlobalVariable *VTT, llvm::GlobalVariable::LinkageTypes Linkage, const CXXRecordDecl *RD)
 EmitVTTDefinition - Emit the definition of the given vtable. More...
 
void EmitThunks (GlobalDecl GD)
 EmitThunks - Emit the associated thunks for the given global decl. More...
 
void GenerateClassData (const CXXRecordDecl *RD)
 GenerateClassData - Generate all the class data required to be generated upon definition of a KeyFunction. More...
 
bool isVTableExternal (const CXXRecordDecl *RD)
 At this point in the translation unit, does it appear that can we rely on the vtable being defined elsewhere in the program? More...
 

Detailed Description

Definition at line 31 of file CGVTables.h.

Constructor & Destructor Documentation

CodeGenVTables::CodeGenVTables ( CodeGenModule CGM)

Definition at line 32 of file CGVTables.cpp.

Member Function Documentation

llvm::Constant * CodeGenVTables::CreateVTableInitializer ( const CXXRecordDecl RD,
const VTableComponent Components,
unsigned  NumComponents,
const VTableLayout::VTableThunkTy VTableThunks,
unsigned  NumVTableThunks,
llvm::Constant *  RTTI 
)

CreateVTableInitializer - Create a vtable initializer for the given record decl.

Parameters
Components- The vtable components; this is really an array of VTableComponents.

Definition at line 523 of file CGVTables.cpp.

References clang::VTableComponent::CK_CompleteDtorPointer, clang::VTableComponent::CK_DeletingDtorPointer, clang::VTableComponent::CK_FunctionPointer, clang::VTableComponent::CK_OffsetToTop, clang::VTableComponent::CK_RTTI, clang::VTableComponent::CK_UnusedFunctionPointer, clang::VTableComponent::CK_VBaseOffset, clang::VTableComponent::CK_VCallOffset, clang::CodeGen::CodeGenTypes::ConvertType(), clang::CodeGen::CodeGenModule::CreateRuntimeFunction(), clang::Dtor_Complete, clang::Dtor_Deleting, clang::CodeGen::CodeGenModule::GetAddrOfFunction(), clang::CodeGen::CodeGenModule::GetAddrOfThunk(), clang::CodeGen::CodeGenModule::getContext(), clang::CodeGen::CodeGenModule::getCXXABI(), clang::GlobalDecl::getDecl(), clang::CodeGen::CGCXXABI::GetDeletedVirtualCallName(), clang::VTableComponent::getDestructorDecl(), clang::VTableComponent::getFunctionDecl(), clang::CodeGen::CodeGenTypes::GetFunctionTypeForVTable(), clang::VTableComponent::getKind(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::VTableComponent::getOffsetToTop(), clang::ASTContext::getPointerDiffType(), clang::CodeGen::CGCXXABI::GetPureVirtualCallName(), clang::CharUnits::getQuantity(), clang::CodeGen::CodeGenModule::getTypes(), clang::VTableComponent::getVBaseOffset(), clang::VTableComponent::getVCallOffset(), I, Inits, clang::CodeGen::CodeGenTypeCache::Int8PtrTy, clang::CodeGen::Type, and clang::CodeGen::CodeGenTypeCache::VoidTy.

Referenced by GenerateConstructionVTable().

void CodeGenVTables::EmitThunks ( GlobalDecl  GD)

EmitThunks - Emit the associated thunks for the given global decl.

Definition at line 504 of file CGVTables.cpp.

References clang::Dtor_Base, getCanonicalDecl(), clang::GlobalDecl::getDecl(), clang::GlobalDecl::getDtorType(), and clang::VTableContextBase::getThunkInfo().

Referenced by emitCXXDestructor().

void CodeGenVTables::EmitVTTDefinition ( llvm::GlobalVariable *  VTT,
llvm::GlobalVariable::LinkageTypes  Linkage,
const CXXRecordDecl RD 
)
void CodeGenVTables::GenerateClassData ( const CXXRecordDecl RD)

GenerateClassData - Generate all the class data required to be generated upon definition of a KeyFunction.

This includes the vtable, the RTTI data structure (if RTTI is enabled) and the VTT (if the class has virtual bases).

Definition at line 823 of file CGVTables.cpp.

References clang::CodeGen::CGCXXABI::emitVirtualInheritanceTables(), clang::CodeGen::CGCXXABI::emitVTableDefinitions(), clang::CodeGen::CodeGenModule::getCXXABI(), clang::CodeGen::CodeGenModule::getModuleDebugInfo(), and clang::CXXRecordDecl::getNumVBases().

Referenced by clang::CodeGen::CodeGenModule::EmitVTable().

llvm::GlobalVariable * CodeGenVTables::GenerateConstructionVTable ( const CXXRecordDecl RD,
const BaseSubobject Base,
bool  BaseIsVirtual,
llvm::GlobalVariable::LinkageTypes  Linkage,
VTableAddressPointsMapTy &  AddressPoints 
)
llvm::GlobalVariable * CodeGenVTables::GetAddrOfVTT ( const CXXRecordDecl RD)
ItaniumVTableContext& clang::CodeGen::CodeGenVTables::getItaniumVTableContext ( )
inline
MicrosoftVTableContext& clang::CodeGen::CodeGenVTables::getMicrosoftVTableContext ( )
inline
uint64_t CodeGenVTables::getSecondaryVirtualPointerIndex ( const CXXRecordDecl RD,
BaseSubobject  Base 
)

getSecondaryVirtualPointerIndex - Return the index in the VTT where the virtual pointer for the given subobject is located.

Definition at line 154 of file CGVTT.cpp.

References Builder, E, clang::CodeGen::CodeGenModule::getContext(), and I.

uint64_t CodeGenVTables::getSubVTTIndex ( const CXXRecordDecl RD,
BaseSubobject  Base 
)

getSubVTTIndex - Return the index of the sub-VTT for the base class of the given record decl.

Definition at line 128 of file CGVTT.cpp.

References Builder, E, clang::CodeGen::CodeGenModule::getContext(), and I.

Referenced by clang::CodeGen::CodeGenFunction::GetVTTParameter().

bool CodeGenVTables::isVTableExternal ( const CXXRecordDecl RD)

At this point in the translation unit, does it appear that can we rely on the vtable being defined elsewhere in the program?

The response is really only definitive when called at the end of the translation unit.

The only semantic restriction here is that the object file should not contain a vtable definition when that vtable is defined strongly elsewhere. Otherwise, we'd just like to avoid emitting vtables when unnecessary.

Definition at line 843 of file CGVTables.cpp.

References clang::CodeGen::CodeGenModule::getContext(), clang::ASTContext::getCurrentKeyFunction(), clang::TargetInfo::getCXXABI(), clang::CodeGen::CodeGenModule::getTarget(), clang::CXXRecordDecl::getTemplateSpecializationKind(), clang::FunctionDecl::hasBody(), clang::CXXRecordDecl::isDynamicClass(), clang::TargetCXXABI::isMicrosoft(), clang::TSK_ExplicitInstantiationDeclaration, clang::TSK_ExplicitInstantiationDefinition, and clang::TSK_ImplicitInstantiation.

Referenced by shouldEmitVTableAtEndOfTranslationUnit(), and ShouldUseExternalRTTIDescriptor().


The documentation for this class was generated from the following files: