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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-exception6//7//===----------------------------------------------------------------------===//8//9// This provides an abstract class for C++ AST support. Concrete10// subclasses of this implement AST support for specific C++ ABIs.11//12//===----------------------------------------------------------------------===//13 14#ifndef LLVM_CLANG_LIB_AST_CXXABI_H15#define LLVM_CLANG_LIB_AST_CXXABI_H16 17#include "clang/AST/Type.h"18 19namespace clang {20 21class ASTContext;22class CXXConstructorDecl;23class DeclaratorDecl;24class MangleContext;25class MangleNumberingContext;26class MemberPointerType;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 as40 /// whether it has padding.41 virtual MemberPointerInfo42 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 virtual48 /// 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);78std::unique_ptr<MangleNumberingContext>79createItaniumNumberingContext(MangleContext *);80}81 82#endif83