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 Expr; 25 class MangleContext; 26 class MangleNumberingContext; 27 class MemberPointerType; 28 29 /// Implements C++ ABI-specific semantic analysis functions. 30 class CXXABI { 31 public: 32 virtual ~CXXABI(); 33 34 struct MemberPointerInfo { 35 uint64_t Width; 36 unsigned Align; 37 bool HasPadding; 38 }; 39 40 /// Returns the width and alignment of a member pointer in bits, as well as 41 /// whether it has padding. 42 virtual MemberPointerInfo 43 getMemberPointerInfo(const MemberPointerType *MPT) const = 0; 44 45 /// Returns the default calling convention for C++ methods. 46 virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0; 47 48 /// Returns whether the given class is nearly empty, with just virtual 49 /// pointers and no data except possibly virtual bases. 50 virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0; 51 52 /// Returns a new mangling number context for this C++ ABI. 53 virtual std::unique_ptr<MangleNumberingContext> 54 createMangleNumberingContext() const = 0; 55 56 /// Adds a mapping from class to copy constructor for this C++ ABI. 57 virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *, 58 CXXConstructorDecl *) = 0; 59 60 /// Retrieves the mapping from class to copy constructor for this C++ ABI. 61 virtual const CXXConstructorDecl * 62 getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0; 63 64 virtual void addTypedefNameForUnnamedTagDecl(TagDecl *TD, 65 TypedefNameDecl *DD) = 0; 66 67 virtual TypedefNameDecl * 68 getTypedefNameForUnnamedTagDecl(const TagDecl *TD) = 0; 69 70 virtual void addDeclaratorForUnnamedTagDecl(TagDecl *TD, 71 DeclaratorDecl *DD) = 0; 72 73 virtual DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) = 0; 74 }; 75 76 /// Creates an instance of a C++ ABI class. 77 CXXABI *CreateItaniumCXXABI(ASTContext &Ctx); 78 CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx); 79 std::unique_ptr<MangleNumberingContext> 80 createItaniumNumberingContext(MangleContext *); 81 } 82 83 #endif 84