1 //===----- CXXABI.h - Interface to C++ ABIs ---------------------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This provides an abstract class for C++ AST support. Concrete
10 // subclasses of this implement AST support for specific C++ ABIs.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_LIB_AST_CXXABI_H
15 #define LLVM_CLANG_LIB_AST_CXXABI_H
17 #include "clang/AST/Type.h"
22 class CXXConstructorDecl;
25 class MemberPointerType;
26 class MangleNumberingContext;
28 /// Implements C++ ABI-specific semantic analysis functions.
33 struct MemberPointerInfo {
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;
44 /// Returns the default calling convention for C++ methods.
45 virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0;
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;
51 /// Returns a new mangling number context for this C++ ABI.
52 virtual std::unique_ptr<MangleNumberingContext>
53 createMangleNumberingContext() const = 0;
55 /// Adds a mapping from class to copy constructor for this C++ ABI.
56 virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *,
57 CXXConstructorDecl *) = 0;
59 /// Retrieves the mapping from class to copy constructor for this C++ ABI.
60 virtual const CXXConstructorDecl *
61 getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0;
63 virtual void addTypedefNameForUnnamedTagDecl(TagDecl *TD,
64 TypedefNameDecl *DD) = 0;
66 virtual TypedefNameDecl *
67 getTypedefNameForUnnamedTagDecl(const TagDecl *TD) = 0;
69 virtual void addDeclaratorForUnnamedTagDecl(TagDecl *TD,
70 DeclaratorDecl *DD) = 0;
72 virtual DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) = 0;
75 /// Creates an instance of a C++ ABI class.
76 CXXABI *CreateItaniumCXXABI(ASTContext &Ctx);
77 CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx);