DeclVisitor.h revision 30a2e16f6c27f888dd11eba6bbbae1e980078fcb
1//===--- DeclVisitor.h - Visitor for Decl subclasses ------------*- 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 file defines the DeclVisitor interface. 11// 12//===----------------------------------------------------------------------===// 13#ifndef LLVM_CLANG_AST_DECLVISITOR_H 14#define LLVM_CLANG_AST_DECLVISITOR_H 15 16#include "clang/AST/Decl.h" 17#include "clang/AST/DeclCXX.h" 18#include "clang/AST/DeclFriend.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/AST/DeclTemplate.h" 21 22namespace clang { 23 24#define DISPATCH(NAME, CLASS) \ 25 return static_cast<ImplClass*>(this)-> Visit##NAME(static_cast<CLASS*>(D)) 26 27/// \brief A simple visitor class that helps create declaration visitors. 28template<typename ImplClass, typename RetTy=void> 29class DeclVisitor { 30public: 31 RetTy Visit(Decl *D) { 32 switch (D->getKind()) { 33#define DECL(DERIVED, BASE) \ 34 case Decl::DERIVED: DISPATCH(DERIVED##Decl, DERIVED##Decl); 35#define ABSTRACT_DECL(DECL) 36#include "clang/AST/DeclNodes.inc" 37 } 38 llvm_unreachable("Decl that isn't part of DeclNodes.inc!"); 39 } 40 41 // If the implementation chooses not to implement a certain visit 42 // method, fall back to the parent. 43#define DECL(DERIVED, BASE) \ 44 RetTy Visit##DERIVED##Decl(DERIVED##Decl *D) { DISPATCH(BASE, BASE); } 45#include "clang/AST/DeclNodes.inc" 46 47 RetTy VisitDecl(Decl *D) { return RetTy(); } 48}; 49 50#undef DISPATCH 51 52} // end namespace clang 53 54#endif // LLVM_CLANG_AST_DECLVISITOR_H 55