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 CXXConstructorDecl; 24 class Expr; 25 class MemberPointerType; 26 class MangleNumberingContext; 27 28 /// Implements C++ ABI-specific semantic analysis functions. 29 class CXXABI { 30 public: 31 virtual ~CXXABI(); 32 33 /// Returns the width and alignment of a member pointer in bits. 34 virtual std::pair<uint64_t, unsigned> 35 getMemberPointerWidthAndAlign(const MemberPointerType *MPT) const = 0; 36 37 /// Returns the default calling convention for C++ methods. 38 virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0; 39 40 /// Returns whether the given class is nearly empty, with just virtual 41 /// pointers and no data except possibly virtual bases. 42 virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0; 43 44 /// Returns a new mangling number context for this C++ ABI. 45 virtual MangleNumberingContext *createMangleNumberingContext() const = 0; 46 47 /// Adds a mapping from class to copy constructor for this C++ ABI. 48 virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *, 49 CXXConstructorDecl *) = 0; 50 51 /// Retrieves the mapping from class to copy constructor for this C++ ABI. 52 virtual const CXXConstructorDecl * 53 getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0; 54 55 virtual void addDefaultArgExprForConstructor(const CXXConstructorDecl *CD, 56 unsigned ParmIdx, Expr *DAE) = 0; 57 58 virtual Expr *getDefaultArgExprForConstructor(const CXXConstructorDecl *CD, 59 unsigned ParmIdx) = 0; 60 }; 61 62 /// Creates an instance of a C++ ABI class. 63 CXXABI *CreateItaniumCXXABI(ASTContext &Ctx); 64 CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx); 65 } 66 67 #endif 68