mirror of
https://github.com/llvm/llvm-project.git
synced 2025-05-02 21:56:05 +00:00
2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
132 lines
4.8 KiB
C++
132 lines
4.8 KiB
C++
//===--- CGVTables.h - Emit LLVM Code for C++ vtables -----------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This contains code dealing with C++ code generation of virtual tables.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CLANG_LIB_CODEGEN_CGVTABLES_H
|
|
#define LLVM_CLANG_LIB_CODEGEN_CGVTABLES_H
|
|
|
|
#include "clang/AST/BaseSubobject.h"
|
|
#include "clang/AST/CharUnits.h"
|
|
#include "clang/AST/GlobalDecl.h"
|
|
#include "clang/AST/VTableBuilder.h"
|
|
#include "clang/Basic/ABI.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/IR/GlobalVariable.h"
|
|
|
|
namespace clang {
|
|
class CXXRecordDecl;
|
|
|
|
namespace CodeGen {
|
|
class CodeGenModule;
|
|
class ConstantArrayBuilder;
|
|
class ConstantStructBuilder;
|
|
|
|
class CodeGenVTables {
|
|
CodeGenModule &CGM;
|
|
|
|
VTableContextBase *VTContext;
|
|
|
|
/// VTableAddressPointsMapTy - Address points for a single vtable.
|
|
typedef VTableLayout::AddressPointsMapTy VTableAddressPointsMapTy;
|
|
|
|
typedef std::pair<const CXXRecordDecl *, BaseSubobject> BaseSubobjectPairTy;
|
|
typedef llvm::DenseMap<BaseSubobjectPairTy, uint64_t> SubVTTIndiciesMapTy;
|
|
|
|
/// SubVTTIndicies - Contains indices into the various sub-VTTs.
|
|
SubVTTIndiciesMapTy SubVTTIndicies;
|
|
|
|
typedef llvm::DenseMap<BaseSubobjectPairTy, uint64_t>
|
|
SecondaryVirtualPointerIndicesMapTy;
|
|
|
|
/// SecondaryVirtualPointerIndices - Contains the secondary virtual pointer
|
|
/// indices.
|
|
SecondaryVirtualPointerIndicesMapTy SecondaryVirtualPointerIndices;
|
|
|
|
/// Cache for the pure virtual member call function.
|
|
llvm::Constant *PureVirtualFn = nullptr;
|
|
|
|
/// Cache for the deleted virtual member call function.
|
|
llvm::Constant *DeletedVirtualFn = nullptr;
|
|
|
|
/// Get the address of a thunk and emit it if necessary.
|
|
llvm::Constant *maybeEmitThunk(GlobalDecl GD,
|
|
const ThunkInfo &ThunkAdjustments,
|
|
bool ForVTable);
|
|
|
|
void addVTableComponent(ConstantArrayBuilder &builder,
|
|
const VTableLayout &layout, unsigned idx,
|
|
llvm::Constant *rtti,
|
|
unsigned &nextVTableThunkIndex);
|
|
|
|
public:
|
|
/// Add vtable components for the given vtable layout to the given
|
|
/// global initializer.
|
|
void createVTableInitializer(ConstantStructBuilder &builder,
|
|
const VTableLayout &layout,
|
|
llvm::Constant *rtti);
|
|
|
|
CodeGenVTables(CodeGenModule &CGM);
|
|
|
|
ItaniumVTableContext &getItaniumVTableContext() {
|
|
return *cast<ItaniumVTableContext>(VTContext);
|
|
}
|
|
|
|
MicrosoftVTableContext &getMicrosoftVTableContext() {
|
|
return *cast<MicrosoftVTableContext>(VTContext);
|
|
}
|
|
|
|
/// getSubVTTIndex - Return the index of the sub-VTT for the base class of the
|
|
/// given record decl.
|
|
uint64_t getSubVTTIndex(const CXXRecordDecl *RD, BaseSubobject Base);
|
|
|
|
/// getSecondaryVirtualPointerIndex - Return the index in the VTT where the
|
|
/// virtual pointer for the given subobject is located.
|
|
uint64_t getSecondaryVirtualPointerIndex(const CXXRecordDecl *RD,
|
|
BaseSubobject Base);
|
|
|
|
/// GenerateConstructionVTable - Generate a construction vtable for the given
|
|
/// base subobject.
|
|
llvm::GlobalVariable *
|
|
GenerateConstructionVTable(const CXXRecordDecl *RD, const BaseSubobject &Base,
|
|
bool BaseIsVirtual,
|
|
llvm::GlobalVariable::LinkageTypes Linkage,
|
|
VTableAddressPointsMapTy& AddressPoints);
|
|
|
|
|
|
/// GetAddrOfVTT - Get the address of the VTT for the given record decl.
|
|
llvm::GlobalVariable *GetAddrOfVTT(const CXXRecordDecl *RD);
|
|
|
|
/// EmitVTTDefinition - Emit the definition of the given vtable.
|
|
void EmitVTTDefinition(llvm::GlobalVariable *VTT,
|
|
llvm::GlobalVariable::LinkageTypes Linkage,
|
|
const CXXRecordDecl *RD);
|
|
|
|
/// EmitThunks - Emit the associated thunks for the given global decl.
|
|
void EmitThunks(GlobalDecl GD);
|
|
|
|
/// 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).
|
|
void GenerateClassData(const CXXRecordDecl *RD);
|
|
|
|
bool isVTableExternal(const CXXRecordDecl *RD);
|
|
|
|
/// 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.
|
|
llvm::Type *getVTableType(const VTableLayout &layout);
|
|
};
|
|
|
|
} // end namespace CodeGen
|
|
} // end namespace clang
|
|
#endif
|