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_AST_CXXABI_H
16#define LLVM_CLANG_AST_CXXABI_H
17
18#include "clang/AST/Type.h"
19
20namespace clang {
21
22class ASTContext;
23class MemberPointerType;
24class MangleNumberingContext;
25
26/// Implements C++ ABI-specific semantic analysis functions.
27class CXXABI {
28public:
29  virtual ~CXXABI();
30
31  /// Returns the width and alignment of a member pointer in bits.
32  virtual std::pair<uint64_t, unsigned>
33  getMemberPointerWidthAndAlign(const MemberPointerType *MPT) const = 0;
34
35  /// Returns the default calling convention for C++ methods.
36  virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0;
37
38  /// Returns whether the given class is nearly empty, with just virtual
39  /// pointers and no data except possibly virtual bases.
40  virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0;
41
42  /// Returns a new mangling number context for this C++ ABI.
43  virtual MangleNumberingContext *createMangleNumberingContext() const = 0;
44};
45
46/// Creates an instance of a C++ ABI class.
47CXXABI *CreateItaniumCXXABI(ASTContext &Ctx);
48CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx);
49}
50
51#endif
52