1//===----- CXXABI.h - Interface to C++ ABIs ---------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This provides an abstract class for C++ AST support. Concrete 11// subclasses of this implement AST support for specific C++ ABIs. 12// 13//===----------------------------------------------------------------------===// 14 15#ifndef LLVM_CLANG_AST_CXXABI_H 16#define LLVM_CLANG_AST_CXXABI_H 17 18#include "clang/AST/Type.h" 19 20namespace clang { 21 22class ASTContext; 23class MemberPointerType; 24class MangleNumberingContext; 25 26/// Implements C++ ABI-specific semantic analysis functions. 27class CXXABI { 28public: 29 virtual ~CXXABI(); 30 31 /// Returns the width and alignment of a member pointer in bits. 32 virtual std::pair<uint64_t, unsigned> 33 getMemberPointerWidthAndAlign(const MemberPointerType *MPT) const = 0; 34 35 /// Returns the default calling convention for C++ methods. 36 virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0; 37 38 /// Returns whether the given class is nearly empty, with just virtual 39 /// pointers and no data except possibly virtual bases. 40 virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0; 41 42 /// Returns a new mangling number context for this C++ ABI. 43 virtual MangleNumberingContext *createMangleNumberingContext() const = 0; 44}; 45 46/// Creates an instance of a C++ ABI class. 47CXXABI *CreateARMCXXABI(ASTContext &Ctx); 48CXXABI *CreateItaniumCXXABI(ASTContext &Ctx); 49CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx); 50} 51 52#endif 53