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 19 namespace clang { 20 21 class ASTContext; 22 class CXXConstructorDecl; 23 class DeclaratorDecl; 24 class MangleContext; 25 class MangleNumberingContext; 26 class MemberPointerType; 27 28 /// Implements C++ ABI-specific semantic analysis functions. 29 class CXXABI { 30 public: 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. 76 CXXABI *CreateItaniumCXXABI(ASTContext &Ctx); 77 CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx); 78 std::unique_ptr<MangleNumberingContext> 79 createItaniumNumberingContext(MangleContext *); 80 } 81 82 #endif 83