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 20 namespace clang { 21 22 class ASTContext; 23 class MemberPointerType; 24 class MangleNumberingContext; 25 26 /// Implements C++ ABI-specific semantic analysis functions. 27 class CXXABI { 28 public: 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. 47 CXXABI *CreateItaniumCXXABI(ASTContext &Ctx); 48 CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx); 49 } 50 51 #endif 52