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 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 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);
78std::unique_ptr<MangleNumberingContext>
79createItaniumNumberingContext(MangleContext *);
80}
81
82#endif
83