forked from OSchip/llvm-project
135 lines
4.9 KiB
C++
135 lines
4.9 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 LLVM_CLANG_LIB_CODEGEN_CGVTABLES_H
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#define LLVM_CLANG_LIB_CODEGEN_CGVTABLES_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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#include "clang/Basic/ABI.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/IR/GlobalVariable.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 ConstantArrayBuilder;
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class ConstantStructBuilder;
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class CodeGenVTables {
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CodeGenModule &CGM;
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VTableContextBase *VTContext;
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/// VTableAddressPointsMapTy - Address points for a single vtable.
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typedef VTableLayout::AddressPointsMapTy 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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/// Cache for the pure virtual member call function.
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llvm::Constant *PureVirtualFn = nullptr;
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/// Cache for the deleted virtual member call function.
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llvm::Constant *DeletedVirtualFn = nullptr;
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/// emitThunk - Emit a single thunk.
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void emitThunk(GlobalDecl GD, const ThunkInfo &Thunk, bool ForVTable);
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/// maybeEmitThunkForVTable - Emit the given thunk for the vtable if needed by
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/// the ABI.
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void maybeEmitThunkForVTable(GlobalDecl GD, const ThunkInfo &Thunk);
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void addVTableComponent(ConstantArrayBuilder &builder,
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const VTableLayout &layout, unsigned idx,
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llvm::Constant *rtti,
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unsigned &nextVTableThunkIndex);
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public:
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/// Add vtable components for the given vtable layout to the given
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/// global initializer.
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void createVTableInitializer(ConstantStructBuilder &builder,
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const VTableLayout &layout,
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llvm::Constant *rtti);
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CodeGenVTables(CodeGenModule &CGM);
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ItaniumVTableContext &getItaniumVTableContext() {
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return *cast<ItaniumVTableContext>(VTContext);
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}
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MicrosoftVTableContext &getMicrosoftVTableContext() {
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return *cast<MicrosoftVTableContext>(VTContext);
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}
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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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/// 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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/// GetAddrOfVTT - 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
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/// generated upon definition of a KeyFunction. This includes the
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/// vtable, the RTTI data structure (if RTTI is enabled) and the VTT
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/// (if the class has virtual bases).
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void GenerateClassData(const CXXRecordDecl *RD);
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bool isVTableExternal(const CXXRecordDecl *RD);
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/// Returns the type of a vtable with the given layout. Normally a struct of
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/// arrays of pointers, with one struct element for each vtable in the vtable
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/// group.
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llvm::Type *getVTableType(const VTableLayout &layout);
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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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