1 //===--- DeclVisitor.h - Visitor for Decl subclasses ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the DeclVisitor interface.
12 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_CLANG_AST_DECLVISITOR_H
14 #define LLVM_CLANG_AST_DECLVISITOR_H
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"
24 namespace declvisitor {
26 template <typename T> struct make_ptr { typedef T *type; };
27 template <typename T> struct make_const_ptr { typedef const T *type; };
29 /// \brief A simple visitor class that helps create declaration visitors.
30 template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
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))
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"
45 llvm_unreachable("Decl that isn't part of DeclNodes.inc!");
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"
54 RetTy VisitDecl(PTR(Decl) D) { return RetTy(); }
60 } // end namespace declvisitor
62 /// \brief A simple visitor class that helps create declaration visitors.
64 /// This class does not preserve constness of Decl pointers (see also
65 /// ConstDeclVisitor).
66 template<typename ImplClass, typename RetTy=void>
68 : public declvisitor::Base<declvisitor::make_ptr, ImplClass, RetTy> {};
70 /// \brief A simple visitor class that helps create declaration visitors.
72 /// This class preserves constness of Decl pointers (see also DeclVisitor).
73 template<typename ImplClass, typename RetTy=void>
74 class ConstDeclVisitor
75 : public declvisitor::Base<declvisitor::make_const_ptr, ImplClass, RetTy> {};
77 } // end namespace clang
79 #endif // LLVM_CLANG_AST_DECLVISITOR_H