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//===--- CGVtable.h - Emit LLVM Code for C++ vtables ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code dealing with C++ code generation of virtual tables.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_CODEGEN_CGVTABLE_H
#define CLANG_CODEGEN_CGVTABLE_H
#include "llvm/ADT/DenseMap.h"
#include "GlobalDecl.h"
namespace clang {
class CXXMethodDecl;
class CXXRecordDecl;
namespace CodeGen {
class CodeGenModule;
class CGVtableInfo {
CodeGenModule &CGM;
/// MethodVtableIndices - Contains the index (relative to the vtable address
/// point) where the function pointer for a virtual function is stored.
typedef llvm::DenseMap<GlobalDecl, int64_t> MethodVtableIndicesTy;
MethodVtableIndicesTy MethodVtableIndices;
typedef std::pair<const CXXRecordDecl *,
const CXXRecordDecl *> ClassPairTy;
/// VirtualBaseClassIndicies - Contains the index into the vtable where the
/// offsets for virtual bases of a class are stored.
typedef llvm::DenseMap<ClassPairTy, int64_t> VirtualBaseClassIndiciesTy;
VirtualBaseClassIndiciesTy VirtualBaseClassIndicies;
llvm::DenseMap<const CXXRecordDecl *, llvm::Constant *> Vtables;
public:
CGVtableInfo(CodeGenModule &CGM)
: CGM(CGM) { }
/// getMethodVtableIndex - Return the index (relative to the vtable address
/// point) where the function pointer for the given virtual function is
/// stored.
int64_t getMethodVtableIndex(GlobalDecl GD);
/// getVirtualBaseOffsetIndex - Return the index (relative to the vtable
/// address point) where the offset of the virtual base that contains the
/// given Base is stored, otherwise, if no virtual base contains the given
/// class, return 0. Base must be a virtual base class or an unambigious
/// base.
int64_t getVirtualBaseOffsetIndex(const CXXRecordDecl *RD,
const CXXRecordDecl *VBase);
llvm::Constant *getVtable(const CXXRecordDecl *RD);
llvm::Constant *getCtorVtable(const CXXRecordDecl *RD,
const CXXRecordDecl *Class, uint64_t Offset);
/// GenerateClassData - Generate all the class data requires to be generated
/// upon definition of a KeyFunction. This includes the vtable, the
/// rtti data structure and the VTT.
void GenerateClassData(const CXXRecordDecl *RD);
};
}
}
#endif
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