80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//===--- DeclVisitor.h - Visitor for Decl subclasses ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the DeclVisitor interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_DECLVISITOR_H
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#define LLVM_CLANG_AST_DECLVISITOR_H
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclFriend.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/DeclOpenMP.h"
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#include "clang/AST/DeclTemplate.h"
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namespace clang {
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namespace declvisitor {
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template <typename T> struct make_ptr { typedef T *type; };
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template <typename T> struct make_const_ptr { typedef const T *type; };
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/// \brief A simple visitor class that helps create declaration visitors.
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template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
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class Base {
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public:
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#define PTR(CLASS) typename Ptr<CLASS>::type
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#define DISPATCH(NAME, CLASS) \
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return static_cast<ImplClass*>(this)->Visit##NAME(static_cast<PTR(CLASS)>(D))
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RetTy Visit(PTR(Decl) D) {
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switch (D->getKind()) {
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#define DECL(DERIVED, BASE) \
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case Decl::DERIVED: DISPATCH(DERIVED##Decl, DERIVED##Decl);
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#define ABSTRACT_DECL(DECL)
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#include "clang/AST/DeclNodes.inc"
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}
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llvm_unreachable("Decl that isn't part of DeclNodes.inc!");
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}
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// If the implementation chooses not to implement a certain visit
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// method, fall back to the parent.
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#define DECL(DERIVED, BASE) \
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RetTy Visit##DERIVED##Decl(PTR(DERIVED##Decl) D) { DISPATCH(BASE, BASE); }
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#include "clang/AST/DeclNodes.inc"
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RetTy VisitDecl(PTR(Decl) D) { return RetTy(); }
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#undef PTR
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#undef DISPATCH
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};
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} // end namespace declvisitor
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/// \brief A simple visitor class that helps create declaration visitors.
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///
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/// This class does not preserve constness of Decl pointers (see also
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/// ConstDeclVisitor).
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template<typename ImplClass, typename RetTy=void>
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class DeclVisitor
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: public declvisitor::Base<declvisitor::make_ptr, ImplClass, RetTy> {};
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/// \brief A simple visitor class that helps create declaration visitors.
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///
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/// This class preserves constness of Decl pointers (see also DeclVisitor).
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template<typename ImplClass, typename RetTy=void>
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class ConstDeclVisitor
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: public declvisitor::Base<declvisitor::make_const_ptr, ImplClass, RetTy> {};
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} // end namespace clang
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#endif // LLVM_CLANG_AST_DECLVISITOR_H
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