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_LIB_AST_CXXABI_H
16#define LLVM_CLANG_LIB_AST_CXXABI_H
17
18#include "clang/AST/Type.h"
19
20namespace clang {
21
22class ASTContext;
23class CXXConstructorDecl;
24class DeclaratorDecl;
25class Expr;
26class MemberPointerType;
27class MangleNumberingContext;
28
29/// Implements C++ ABI-specific semantic analysis functions.
30class CXXABI {
31public:
32  virtual ~CXXABI();
33
34  /// Returns the width and alignment of a member pointer in bits.
35  virtual std::pair<uint64_t, unsigned>
36  getMemberPointerWidthAndAlign(const MemberPointerType *MPT) const = 0;
37
38  /// Returns the default calling convention for C++ methods.
39  virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0;
40
41  /// Returns whether the given class is nearly empty, with just virtual
42  /// pointers and no data except possibly virtual bases.
43  virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0;
44
45  /// Returns a new mangling number context for this C++ ABI.
46  virtual MangleNumberingContext *createMangleNumberingContext() const = 0;
47
48  /// Adds a mapping from class to copy constructor for this C++ ABI.
49  virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *,
50                                                    CXXConstructorDecl *) = 0;
51
52  /// Retrieves the mapping from class to copy constructor for this C++ ABI.
53  virtual const CXXConstructorDecl *
54  getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0;
55
56  virtual void addDefaultArgExprForConstructor(const CXXConstructorDecl *CD,
57                                               unsigned ParmIdx, Expr *DAE) = 0;
58
59  virtual Expr *getDefaultArgExprForConstructor(const CXXConstructorDecl *CD,
60                                                unsigned ParmIdx) = 0;
61
62  virtual void addTypedefNameForUnnamedTagDecl(TagDecl *TD,
63                                               TypedefNameDecl *DD) = 0;
64
65  virtual TypedefNameDecl *
66  getTypedefNameForUnnamedTagDecl(const TagDecl *TD) = 0;
67
68  virtual void addDeclaratorForUnnamedTagDecl(TagDecl *TD,
69                                              DeclaratorDecl *DD) = 0;
70
71  virtual DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) = 0;
72};
73
74/// Creates an instance of a C++ ABI class.
75CXXABI *CreateItaniumCXXABI(ASTContext &Ctx);
76CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx);
77}
78
79#endif
80