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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- AttrVisitor.h - Visitor for Attr 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 AttrVisitor interface. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_CLANG_AST_ATTRVISITOR_H |
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| 14 | #define LLVM_CLANG_AST_ATTRVISITOR_H |
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| 15 | |||
| 16 | #include "clang/AST/Attr.h" |
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| 17 | |||
| 18 | namespace clang { |
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| 19 | |||
| 20 | namespace attrvisitor { |
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| 21 | |||
| 22 | /// A simple visitor class that helps create attribute visitors. |
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| 23 | template <template <typename> class Ptr, typename ImplClass, |
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| 24 | typename RetTy = void, class... ParamTys> |
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| 25 | class Base { |
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| 26 | public: |
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| 27 | #define PTR(CLASS) typename Ptr<CLASS>::type |
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| 28 | #define DISPATCH(NAME) \ |
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| 29 | return static_cast<ImplClass *>(this)->Visit##NAME(static_cast<PTR(NAME)>(A)) |
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| 30 | |||
| 31 | RetTy Visit(PTR(Attr) A) { |
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| 32 | switch (A->getKind()) { |
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| 33 | |||
| 34 | #define ATTR(NAME) \ |
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| 35 | case attr::NAME: \ |
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| 36 | DISPATCH(NAME##Attr); |
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| 37 | #include "clang/Basic/AttrList.inc" |
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| 38 | } |
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| 39 | llvm_unreachable("Attr that isn't part of AttrList.inc!"); |
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| 40 | } |
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| 41 | |||
| 42 | // If the implementation chooses not to implement a certain visit |
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| 43 | // method, fall back to the parent. |
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| 44 | #define ATTR(NAME) \ |
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| 45 | RetTy Visit##NAME##Attr(PTR(NAME##Attr) A) { DISPATCH(Attr); } |
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| 46 | #include "clang/Basic/AttrList.inc" |
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| 47 | |||
| 48 | RetTy VisitAttr(PTR(Attr)) { return RetTy(); } |
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| 49 | |||
| 50 | #undef PTR |
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| 51 | #undef DISPATCH |
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| 52 | }; |
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| 53 | |||
| 54 | } // namespace attrvisitor |
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| 55 | |||
| 56 | /// A simple visitor class that helps create attribute visitors. |
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| 57 | /// |
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| 58 | /// This class does not preserve constness of Attr pointers (see |
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| 59 | /// also ConstAttrVisitor). |
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| 60 | template <typename ImplClass, typename RetTy = void, typename... ParamTys> |
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| 61 | class AttrVisitor : public attrvisitor::Base<std::add_pointer, ImplClass, RetTy, |
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| 62 | ParamTys...> {}; |
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| 63 | |||
| 64 | /// A simple visitor class that helps create attribute visitors. |
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| 65 | /// |
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| 66 | /// This class preserves constness of Attr pointers (see also |
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| 67 | /// AttrVisitor). |
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| 68 | template <typename ImplClass, typename RetTy = void, typename... ParamTys> |
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| 69 | class ConstAttrVisitor |
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| 70 | : public attrvisitor::Base<llvm::make_const_ptr, ImplClass, RetTy, |
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| 71 | ParamTys...> {}; |
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| 72 | |||
| 73 | } // namespace clang |
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| 74 | |||
| 75 | #endif // LLVM_CLANG_AST_ATTRVISITOR_H |