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/DeclOpenMP.h" 21#include "clang/AST/DeclTemplate.h" 22 23namespace clang { 24namespace declvisitor { 25 26template <typename T> struct make_ptr { typedef T *type; }; 27template <typename T> struct make_const_ptr { typedef const T *type; }; 28 29/// \brief A simple visitor class that helps create declaration visitors. 30template<template <typename> class Ptr, typename ImplClass, typename RetTy=void> 31class Base { 32public: 33 34#define PTR(CLASS) typename Ptr<CLASS>::type 35#define DISPATCH(NAME, CLASS) \ 36 return static_cast<ImplClass*>(this)->Visit##NAME(static_cast<PTR(CLASS)>(D)) 37 38 RetTy Visit(PTR(Decl) D) { 39 switch (D->getKind()) { 40#define DECL(DERIVED, BASE) \ 41 case Decl::DERIVED: DISPATCH(DERIVED##Decl, DERIVED##Decl); 42#define ABSTRACT_DECL(DECL) 43#include "clang/AST/DeclNodes.inc" 44 } 45 llvm_unreachable("Decl that isn't part of DeclNodes.inc!"); 46 } 47 48 // If the implementation chooses not to implement a certain visit 49 // method, fall back to the parent. 50#define DECL(DERIVED, BASE) \ 51 RetTy Visit##DERIVED##Decl(PTR(DERIVED##Decl) D) { DISPATCH(BASE, BASE); } 52#include "clang/AST/DeclNodes.inc" 53 54 RetTy VisitDecl(PTR(Decl) D) { return RetTy(); } 55 56#undef PTR 57#undef DISPATCH 58}; 59 60} // end namespace declvisitor 61 62/// \brief A simple visitor class that helps create declaration visitors. 63/// 64/// This class does not preserve constness of Decl pointers (see also 65/// ConstDeclVisitor). 66template<typename ImplClass, typename RetTy=void> 67class DeclVisitor 68 : public declvisitor::Base<declvisitor::make_ptr, ImplClass, RetTy> {}; 69 70/// \brief A simple visitor class that helps create declaration visitors. 71/// 72/// This class preserves constness of Decl pointers (see also DeclVisitor). 73template<typename ImplClass, typename RetTy=void> 74class ConstDeclVisitor 75 : public declvisitor::Base<declvisitor::make_const_ptr, ImplClass, RetTy> {}; 76 77} // end namespace clang 78 79#endif // LLVM_CLANG_AST_DECLVISITOR_H 80