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//===- AttrVisitor.h - Visitor for Attr subclasses --------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the AttrVisitor interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_ATTRVISITOR_H
#define LLVM_CLANG_AST_ATTRVISITOR_H
#include "clang/AST/Attr.h"
namespace clang {
namespace attrvisitor {
/// A simple visitor class that helps create attribute visitors.
template <template <typename> class Ptr, typename ImplClass,
typename RetTy = void, class... ParamTys>
class Base {
public:
#define PTR(CLASS) typename Ptr<CLASS>::type
#define DISPATCH(NAME) \
return static_cast<ImplClass *>(this)->Visit##NAME(static_cast<PTR(NAME)>(A))
RetTy Visit(PTR(Attr) A) {
switch (A->getKind()) {
#define ATTR(NAME) \
case attr::NAME: \
DISPATCH(NAME##Attr);
#include "clang/Basic/AttrList.inc"
}
llvm_unreachable("Attr that isn't part of AttrList.inc!");
}
// If the implementation chooses not to implement a certain visit
// method, fall back to the parent.
#define ATTR(NAME) \
RetTy Visit##NAME##Attr(PTR(NAME##Attr) A) { DISPATCH(Attr); }
#include "clang/Basic/AttrList.inc"
RetTy VisitAttr(PTR(Attr)) { return RetTy(); }
#undef PTR
#undef DISPATCH
};
} // namespace attrvisitor
/// A simple visitor class that helps create attribute visitors.
///
/// This class does not preserve constness of Attr pointers (see
/// also ConstAttrVisitor).
template <typename ImplClass, typename RetTy = void, typename... ParamTys>
class AttrVisitor : public attrvisitor::Base<std::add_pointer, ImplClass, RetTy,
ParamTys...> {};
/// A simple visitor class that helps create attribute visitors.
///
/// This class preserves constness of Attr pointers (see also
/// AttrVisitor).
template <typename ImplClass, typename RetTy = void, typename... ParamTys>
class ConstAttrVisitor
: public attrvisitor::Base<llvm::make_const_ptr, ImplClass, RetTy,
ParamTys...> {};
} // namespace clang
#endif // LLVM_CLANG_AST_ATTRVISITOR_H
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