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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- DeclVisitor.h - Visitor for Decl subclasses --------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines the DeclVisitor interface. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_CLANG_AST_DECLVISITOR_H |
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| 14 | #define LLVM_CLANG_AST_DECLVISITOR_H |
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| 15 | |||
| 16 | #include "clang/AST/Decl.h" |
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| 17 | #include "clang/AST/DeclBase.h" |
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| 18 | #include "clang/AST/DeclCXX.h" |
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| 19 | #include "clang/AST/DeclFriend.h" |
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| 20 | #include "clang/AST/DeclObjC.h" |
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| 21 | #include "clang/AST/DeclOpenMP.h" |
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| 22 | #include "clang/AST/DeclTemplate.h" |
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| 23 | #include "llvm/ADT/STLExtras.h" |
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| 24 | #include "llvm/Support/ErrorHandling.h" |
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| 25 | |||
| 26 | namespace clang { |
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| 27 | |||
| 28 | namespace declvisitor { |
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| 29 | /// A simple visitor class that helps create declaration visitors. |
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| 30 | template<template <typename> class Ptr, typename ImplClass, typename RetTy=void> |
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| 31 | class Base { |
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| 32 | public: |
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| 33 | #define PTR(CLASS) typename Ptr<CLASS>::type |
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| 34 | #define DISPATCH(NAME, CLASS) \ |
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| 35 | return static_cast<ImplClass*>(this)->Visit##NAME(static_cast<PTR(CLASS)>(D)) |
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| 36 | |||
| 37 | RetTy Visit(PTR(Decl) D) { |
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| 38 | switch (D->getKind()) { |
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| 39 | #define DECL(DERIVED, BASE) \ |
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| 40 | case Decl::DERIVED: DISPATCH(DERIVED##Decl, DERIVED##Decl); |
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| 41 | #define ABSTRACT_DECL(DECL) |
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| 42 | #include "clang/AST/DeclNodes.inc" |
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| 43 | } |
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| 44 | llvm_unreachable("Decl that isn't part of DeclNodes.inc!"); |
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| 45 | } |
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| 46 | |||
| 47 | // If the implementation chooses not to implement a certain visit |
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| 48 | // method, fall back to the parent. |
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| 49 | #define DECL(DERIVED, BASE) \ |
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| 50 | RetTy Visit##DERIVED##Decl(PTR(DERIVED##Decl) D) { DISPATCH(BASE, BASE); } |
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| 51 | #include "clang/AST/DeclNodes.inc" |
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| 52 | |||
| 53 | RetTy VisitDecl(PTR(Decl) D) { return RetTy(); } |
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| 54 | |||
| 55 | #undef PTR |
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| 56 | #undef DISPATCH |
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| 57 | }; |
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| 58 | |||
| 59 | } // namespace declvisitor |
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| 60 | |||
| 61 | /// A simple visitor class that helps create declaration visitors. |
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| 62 | /// |
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| 63 | /// This class does not preserve constness of Decl pointers (see also |
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| 64 | /// ConstDeclVisitor). |
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| 65 | template <typename ImplClass, typename RetTy = void> |
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| 66 | class DeclVisitor |
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| 67 | : public declvisitor::Base<std::add_pointer, ImplClass, RetTy> {}; |
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| 68 | |||
| 69 | /// A simple visitor class that helps create declaration visitors. |
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| 70 | /// |
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| 71 | /// This class preserves constness of Decl pointers (see also DeclVisitor). |
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| 72 | template <typename ImplClass, typename RetTy = void> |
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| 73 | class ConstDeclVisitor |
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| 74 | : public declvisitor::Base<llvm::make_const_ptr, ImplClass, RetTy> {}; |
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| 75 | |||
| 76 | } // namespace clang |
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| 77 | |||
| 78 | #endif // LLVM_CLANG_AST_DECLVISITOR_H |