CXXABI.h revision 1.1.1.1
1//===----- CXXABI.h - Interface to C++ ABIs ---------------------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This provides an abstract class for C++ AST support. Concrete 10// subclasses of this implement AST support for specific C++ ABIs. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_LIB_AST_CXXABI_H 15#define LLVM_CLANG_LIB_AST_CXXABI_H 16 17#include "clang/AST/Type.h" 18 19namespace clang { 20 21class ASTContext; 22class CXXConstructorDecl; 23class DeclaratorDecl; 24class Expr; 25class MemberPointerType; 26class MangleNumberingContext; 27 28/// Implements C++ ABI-specific semantic analysis functions. 29class CXXABI { 30public: 31 virtual ~CXXABI(); 32 33 struct MemberPointerInfo { 34 uint64_t Width; 35 unsigned Align; 36 bool HasPadding; 37 }; 38 39 /// Returns the width and alignment of a member pointer in bits, as well as 40 /// whether it has padding. 41 virtual MemberPointerInfo 42 getMemberPointerInfo(const MemberPointerType *MPT) const = 0; 43 44 /// Returns the default calling convention for C++ methods. 45 virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0; 46 47 /// Returns whether the given class is nearly empty, with just virtual 48 /// pointers and no data except possibly virtual bases. 49 virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0; 50 51 /// Returns a new mangling number context for this C++ ABI. 52 virtual std::unique_ptr<MangleNumberingContext> 53 createMangleNumberingContext() const = 0; 54 55 /// Adds a mapping from class to copy constructor for this C++ ABI. 56 virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *, 57 CXXConstructorDecl *) = 0; 58 59 /// Retrieves the mapping from class to copy constructor for this C++ ABI. 60 virtual const CXXConstructorDecl * 61 getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0; 62 63 virtual void addTypedefNameForUnnamedTagDecl(TagDecl *TD, 64 TypedefNameDecl *DD) = 0; 65 66 virtual TypedefNameDecl * 67 getTypedefNameForUnnamedTagDecl(const TagDecl *TD) = 0; 68 69 virtual void addDeclaratorForUnnamedTagDecl(TagDecl *TD, 70 DeclaratorDecl *DD) = 0; 71 72 virtual DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) = 0; 73}; 74 75/// Creates an instance of a C++ ABI class. 76CXXABI *CreateItaniumCXXABI(ASTContext &Ctx); 77CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx); 78} 79 80#endif 81