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Extend the CommentVisitor with parameter types

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Summary:
This has precedent in the StmtVisitor.  This change will make it
possible to clean up the comment handling in ASTDumper.

Reviewers: aaron.ballman

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D55069

llvm-svn: 348100
This commit is contained in:
Stephen Kelly 2018-12-02 17:30:34 +00:00
parent 98cd41f928
commit c767e40f47
1 changed files with 16 additions and 13 deletions
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29
clang/include/clang/AST/CommentVisitor.h
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@ -19,14 +19,16 @@ namespace comments {
template <typename T> struct make_ptr { using type = T *; };
template <typename T> struct make_const_ptr { using type = const T *; };
template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
template <template <typename> class Ptr, typename ImplClass,
typename RetTy = void, class... ParamTys>
class CommentVisitorBase {
public:
#define PTR(CLASS) typename Ptr<CLASS>::type
#define DISPATCH(NAME, CLASS) \
return static_cast<ImplClass*>(this)->visit ## NAME(static_cast<PTR(CLASS)>(C))
#define DISPATCH(NAME, CLASS) \
return static_cast<ImplClass *>(this)->visit##NAME( \
static_cast<PTR(CLASS)>(C), std::forward<ParamTys>(P)...)
RetTy visit(PTR(Comment) C) {
RetTy visit(PTR(Comment) C, ParamTys... P) {
if (!C)
return RetTy();
@ -44,25 +46,26 @@ public:
// If the derived class does not implement a certain Visit* method, fall back
// on Visit* method for the superclass.
#define ABSTRACT_COMMENT(COMMENT) COMMENT
#define COMMENT(CLASS, PARENT) \
RetTy visit ## CLASS(PTR(CLASS) C) { DISPATCH(PARENT, PARENT); }
#define COMMENT(CLASS, PARENT) \
RetTy visit##CLASS(PTR(CLASS) C, ParamTys... P) { DISPATCH(PARENT, PARENT); }
#include "clang/AST/CommentNodes.inc"
#undef ABSTRACT_COMMENT
#undef COMMENT
RetTy visitComment(PTR(Comment) C) { return RetTy(); }
RetTy visitComment(PTR(Comment) C, ParamTys... P) { return RetTy(); }
#undef PTR
#undef DISPATCH
};
template<typename ImplClass, typename RetTy=void>
class CommentVisitor :
public CommentVisitorBase<make_ptr, ImplClass, RetTy> {};
template <typename ImplClass, typename RetTy = void, class... ParamTys>
class CommentVisitor
: public CommentVisitorBase<make_ptr, ImplClass, RetTy, ParamTys...> {};
template<typename ImplClass, typename RetTy=void>
class ConstCommentVisitor :
public CommentVisitorBase<make_const_ptr, ImplClass, RetTy> {};
template <typename ImplClass, typename RetTy = void, class... ParamTys>
class ConstCommentVisitor
: public CommentVisitorBase<make_const_ptr, ImplClass, RetTy, ParamTys...> {
};
} // namespace comments
} // namespace clang