142 lines
5.6 KiB
C++
142 lines
5.6 KiB
C++
//===--- CGVTables.h - Emit LLVM Code for C++ vtables -----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code dealing with C++ code generation of virtual tables.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CGVTABLE_H
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#define CLANG_CODEGEN_CGVTABLE_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/GlobalVariable.h"
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#include "clang/Basic/ABI.h"
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#include "clang/AST/BaseSubobject.h"
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#include "clang/AST/CharUnits.h"
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#include "clang/AST/GlobalDecl.h"
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#include "clang/AST/VTableBuilder.h"
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namespace clang {
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class CXXRecordDecl;
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namespace CodeGen {
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class CodeGenModule;
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class CodeGenVTables {
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CodeGenModule &CGM;
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VTableContext VTContext;
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/// VTables - All the vtables which have been defined.
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llvm::DenseMap<const CXXRecordDecl *, llvm::GlobalVariable *> VTables;
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/// VTableAddressPointsMapTy - Address points for a single vtable.
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typedef llvm::DenseMap<BaseSubobject, uint64_t> VTableAddressPointsMapTy;
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typedef std::pair<const CXXRecordDecl *, BaseSubobject> BaseSubobjectPairTy;
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typedef llvm::DenseMap<BaseSubobjectPairTy, uint64_t> SubVTTIndiciesMapTy;
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/// SubVTTIndicies - Contains indices into the various sub-VTTs.
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SubVTTIndiciesMapTy SubVTTIndicies;
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typedef llvm::DenseMap<BaseSubobjectPairTy, uint64_t>
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SecondaryVirtualPointerIndicesMapTy;
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/// SecondaryVirtualPointerIndices - Contains the secondary virtual pointer
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/// indices.
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SecondaryVirtualPointerIndicesMapTy SecondaryVirtualPointerIndices;
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/// EmitThunk - Emit a single thunk.
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void EmitThunk(GlobalDecl GD, const ThunkInfo &Thunk,
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bool UseAvailableExternallyLinkage);
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/// MaybeEmitThunkAvailableExternally - Try to emit the given thunk with
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/// available_externally linkage to allow for inlining of thunks.
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/// This will be done iff optimizations are enabled and the member function
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/// doesn't contain any incomplete types.
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void MaybeEmitThunkAvailableExternally(GlobalDecl GD, const ThunkInfo &Thunk);
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/// CreateVTableInitializer - Create a vtable initializer for the given record
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/// decl.
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/// \param Components - The vtable components; this is really an array of
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/// VTableComponents.
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llvm::Constant *CreateVTableInitializer(const CXXRecordDecl *RD,
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const VTableComponent *Components,
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unsigned NumComponents,
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const VTableLayout::VTableThunkTy *VTableThunks,
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unsigned NumVTableThunks);
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public:
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CodeGenVTables(CodeGenModule &CGM);
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VTableContext &getVTableContext() { return VTContext; }
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/// \brief True if the VTable of this record must be emitted in the
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/// translation unit.
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bool ShouldEmitVTableInThisTU(const CXXRecordDecl *RD);
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/// needsVTTParameter - Return whether the given global decl needs a VTT
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/// parameter, which it does if it's a base constructor or destructor with
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/// virtual bases.
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static bool needsVTTParameter(GlobalDecl GD);
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/// getSubVTTIndex - Return the index of the sub-VTT for the base class of the
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/// given record decl.
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uint64_t getSubVTTIndex(const CXXRecordDecl *RD, BaseSubobject Base);
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/// getSecondaryVirtualPointerIndex - Return the index in the VTT where the
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/// virtual pointer for the given subobject is located.
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uint64_t getSecondaryVirtualPointerIndex(const CXXRecordDecl *RD,
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BaseSubobject Base);
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/// getAddressPoint - Get the address point of the given subobject in the
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/// class decl.
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uint64_t getAddressPoint(BaseSubobject Base, const CXXRecordDecl *RD);
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/// GetAddrOfVTable - Get the address of the vtable for the given record decl.
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llvm::GlobalVariable *GetAddrOfVTable(const CXXRecordDecl *RD);
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/// EmitVTableDefinition - Emit the definition of the given vtable.
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void EmitVTableDefinition(llvm::GlobalVariable *VTable,
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llvm::GlobalVariable::LinkageTypes Linkage,
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const CXXRecordDecl *RD);
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/// GenerateConstructionVTable - Generate a construction vtable for the given
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/// base subobject.
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llvm::GlobalVariable *
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GenerateConstructionVTable(const CXXRecordDecl *RD, const BaseSubobject &Base,
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bool BaseIsVirtual,
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llvm::GlobalVariable::LinkageTypes Linkage,
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VTableAddressPointsMapTy& AddressPoints);
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/// GetAddrOfVTable - Get the address of the VTT for the given record decl.
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llvm::GlobalVariable *GetAddrOfVTT(const CXXRecordDecl *RD);
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/// EmitVTTDefinition - Emit the definition of the given vtable.
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void EmitVTTDefinition(llvm::GlobalVariable *VTT,
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llvm::GlobalVariable::LinkageTypes Linkage,
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const CXXRecordDecl *RD);
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/// EmitThunks - Emit the associated thunks for the given global decl.
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void EmitThunks(GlobalDecl GD);
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/// GenerateClassData - Generate all the class data required to be generated
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/// upon definition of a KeyFunction. This includes the vtable, the
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/// rtti data structure and the VTT.
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///
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/// \param Linkage - The desired linkage of the vtable, the RTTI and the VTT.
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void GenerateClassData(llvm::GlobalVariable::LinkageTypes Linkage,
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const CXXRecordDecl *RD);
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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