DeclVisitor.h source code [clang_source_code/include/clang/AST/DeclVisitor.h]

1	//===- DeclVisitor.h - Visitor for Decl subclasses --------------- C++ --===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This file defines the DeclVisitor interface.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#ifndef LLVM_CLANG_AST_DECLVISITOR_H
14	#define LLVM_CLANG_AST_DECLVISITOR_H
15
16	#include "clang/AST/Decl.h"
17	#include "clang/AST/DeclBase.h"
18	#include "clang/AST/DeclCXX.h"
19	#include "clang/AST/DeclFriend.h"
20	#include "clang/AST/DeclObjC.h"
21	#include "clang/AST/DeclOpenMP.h"
22	#include "clang/AST/DeclTemplate.h"
23	#include "llvm/ADT/STLExtras.h"
24	#include "llvm/Support/ErrorHandling.h"
25
26	namespace clang {
27
28	namespace declvisitor {
29	/// A simple visitor class that helps create declaration visitors.
30	template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
31	class Base {
32	public:
33	#define PTR(CLASS) typename Ptr<CLASS>::type
34	#define DISPATCH(NAME, CLASS) \
35	return static_cast<ImplClass*>(this)->Visit##NAME(static_cast<PTR(CLASS)>(D))
36
37	RetTy Visit(PTR(Decl) D) {
38	switch (D->getKind()) {
39	#define DECL(DERIVED, BASE) \
40	case Decl::DERIVED: DISPATCH(DERIVED##Decl, DERIVED##Decl);
41	#define ABSTRACT_DECL(DECL)
42	#include "clang/AST/DeclNodes.inc"
43	}
44	llvm_unreachable("Decl that isn't part of DeclNodes.inc!");
45	}
46
47	// If the implementation chooses not to implement a certain visit
48	// method, fall back to the parent.
49	#define DECL(DERIVED, BASE) \
50	RetTy Visit##DERIVED##Decl(PTR(DERIVED##Decl) D) { DISPATCH(BASE, BASE); }
51	#include "clang/AST/DeclNodes.inc"
52
53	RetTy VisitDecl(PTR(Decl) D) { return RetTy(); }
54
55	#undef PTR
56	#undef DISPATCH
57	};
58
59	} // namespace declvisitor
60
61	/// A simple visitor class that helps create declaration visitors.
62	///
63	/// This class does not preserve constness of Decl pointers (see also
64	/// ConstDeclVisitor).
65	template <typename ImplClass, typename RetTy = void>
66	class DeclVisitor
67	: public declvisitor::Base<std::add_pointer, ImplClass, RetTy> {};
68
69	/// A simple visitor class that helps create declaration visitors.
70	///
71	/// This class preserves constness of Decl pointers (see also DeclVisitor).
72	template <typename ImplClass, typename RetTy = void>
73	class ConstDeclVisitor
74	: public declvisitor::Base<llvm::make_const_ptr, ImplClass, RetTy> {};
75
76	} // namespace clang
77
78	#endif // LLVM_CLANG_AST_DECLVISITOR_H
79

clang::declvisitor::Base::Visit

clang::declvisitor::Base::VisitDecl

Clang Project