clang  14.0.0git
Public Member Functions | List of all members
clang::CodeGen::CodeGenVTables Class Reference

#include "/home/buildbot/as-worker-4/publish-doxygen-docs/llvm-project/clang/lib/CodeGen/CGVTables.h"

Public Member Functions

void createVTableInitializer (ConstantStructBuilder &builder, const VTableLayout &layout, llvm::Constant *rtti, bool vtableHasLocalLinkage)
 Add vtable components for the given vtable layout to the given global initializer. 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...
 
llvm::Type * getVTableType (const VTableLayout &layout)
 Returns the type of a vtable with the given layout. More...
 
void GenerateRelativeVTableAlias (llvm::GlobalVariable *VTable, llvm::StringRef AliasNameRef)
 Generate a public facing alias for the vtable and make the vtable either hidden or private. More...
 

Detailed Description

Definition at line 32 of file CGVTables.h.

Constructor & Destructor Documentation

◆ CodeGenVTables()

CodeGenVTables::CodeGenVTables ( CodeGenModule CGM)

Definition at line 31 of file CGVTables.cpp.

Member Function Documentation

◆ createVTableInitializer()

void CodeGenVTables::createVTableInitializer ( ConstantStructBuilder builder,
const VTableLayout layout,
llvm::Constant *  rtti,
bool  vtableHasLocalLinkage 
)

◆ EmitThunks()

void CodeGenVTables::EmitThunks ( GlobalDecl  GD)

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

Definition at line 605 of file CGVTables.cpp.

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

◆ EmitVTTDefinition()

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

EmitVTTDefinition - Emit the definition of the given vtable.

Definition at line 41 of file CGVTT.cpp.

◆ GenerateClassData()

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 1091 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().

◆ GenerateConstructionVTable()

llvm::GlobalVariable * CodeGenVTables::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.

Definition at line 856 of file CGVTables.cpp.

References clang::CodeGen::CodeGenModule::getCXXABI(), getItaniumVTableContext(), clang::CodeGen::CGCXXABI::getMangleContext(), and clang::CodeGen::CodeGenModule::getModuleDebugInfo().

Referenced by GetAddrOfVTTVTable().

◆ GenerateRelativeVTableAlias()

void CodeGenVTables::GenerateRelativeVTableAlias ( llvm::GlobalVariable *  VTable,
llvm::StringRef  AliasNameRef 
)

Generate a public facing alias for the vtable and make the vtable either hidden or private.

The alias will have the original linkage and visibility of the vtable. This is used for cases under the relative vtables ABI when a vtable may not be dso_local.

Definition at line 934 of file CGVTables.cpp.

References clang::serialized_diags::create(), getItaniumVTableContext(), clang::CodeGen::CodeGenModule::getModule(), and clang::HiddenVisibility.

◆ GetAddrOfVTT()

llvm::GlobalVariable * CodeGenVTables::GetAddrOfVTT ( const CXXRecordDecl RD)

GetAddrOfVTT - Get the address of the VTT for the given record decl.

Definition at line 104 of file CGVTT.cpp.

References clang::CodeGen::CodeGenModule::getCXXABI(), clang::CodeGen::CGCXXABI::getMangleContext(), and clang::CXXRecordDecl::getNumVBases().

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

◆ getItaniumVTableContext()

ItaniumVTableContext& clang::CodeGen::CodeGenVTables::getItaniumVTableContext ( )
inline

◆ getMicrosoftVTableContext()

MicrosoftVTableContext& clang::CodeGen::CodeGenVTables::getMicrosoftVTableContext ( )
inline

◆ getSecondaryVirtualPointerIndex()

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.

◆ getSubVTTIndex()

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.

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

◆ getVTableType()

llvm::Type * CodeGenVTables::getVTableType ( const VTableLayout layout)

Returns the type of a vtable with the given layout.

Normally a struct of arrays of pointers, with one struct element for each vtable in the vtable group.

Definition at line 823 of file CGVTables.cpp.

References clang::CodeGen::CodeGenModule::getLLVMContext(), clang::VTableLayout::getNumVTables(), and clang::VTableLayout::getVTableSize().

◆ isVTableExternal()

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 1111 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: