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1//===- AttrIterator.h - Classes for attribute iteration ---------*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the Attr vector and specific_attr_iterator interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_AST_ATTRITERATOR_H
15#define LLVM_CLANG_AST_ATTRITERATOR_H
16
17#include "clang/Basic/LLVM.h"
18#include "llvm/ADT/SmallVector.h"
19#include "llvm/Support/Casting.h"
20#include <cassert>
21#include <cstddef>
22#include <iterator>
23
24namespace clang {
25
26class ASTContext;
27class Attr;
28
29} // namespace clang
30
31// Defined in ASTContext.h
32void *operator new(size_t Bytes, const clang::ASTContext &C,
33 size_t Alignment = 8);
34
35// FIXME: Being forced to not have a default argument here due to redeclaration
36// rules on default arguments sucks
37void *operator new[](size_t Bytes, const clang::ASTContext &C,
38 size_t Alignment);
39
40// It is good practice to pair new/delete operators. Also, MSVC gives many
41// warnings if a matching delete overload is not declared, even though the
42// throw() spec guarantees it will not be implicitly called.
43void operator delete(void *Ptr, const clang::ASTContext &C, size_t);
44void operator delete[](void *Ptr, const clang::ASTContext &C, size_t);
45
46namespace clang {
47
48/// AttrVec - A vector of Attr, which is how they are stored on the AST.
49using AttrVec = SmallVector<Attr *, 4>;
50
51/// specific_attr_iterator - Iterates over a subrange of an AttrVec, only
52/// providing attributes that are of a specific type.
53template <typename SpecificAttr, typename Container = AttrVec>
54class specific_attr_iterator {
55 using Iterator = typename Container::const_iterator;
56
57 /// Current - The current, underlying iterator.
58 /// In order to ensure we don't dereference an invalid iterator unless
59 /// specifically requested, we don't necessarily advance this all the
60 /// way. Instead, we advance it when an operation is requested; if the
61 /// operation is acting on what should be a past-the-end iterator,
62 /// then we offer no guarantees, but this way we do not dereference a
63 /// past-the-end iterator when we move to a past-the-end position.
64 mutable Iterator Current;
65
66 void AdvanceToNext() const {
67 while (!isa<SpecificAttr>(*Current))
68 ++Current;
69 }
70
71 void AdvanceToNext(Iterator I) const {
72 while (Current != I && !isa<SpecificAttr>(*Current))
73 ++Current;
74 }
75
76public:
77 using value_type = SpecificAttr *;
78 using reference = SpecificAttr *;
79 using pointer = SpecificAttr *;
80 using iterator_category = std::forward_iterator_tag;
81 using difference_type = std::ptrdiff_t;
82
83 specific_attr_iterator() = default;
84 explicit specific_attr_iterator(Iterator i) : Current(i) {}
85
86 reference operator*() const {
87 AdvanceToNext();
88 return cast<SpecificAttr>(*Current);
89 }
90 pointer operator->() const {
91 AdvanceToNext();
92 return cast<SpecificAttr>(*Current);
93 }
94
95 specific_attr_iterator& operator++() {
96 ++Current;
97 return *this;
98 }
99 specific_attr_iterator operator++(int) {
100 specific_attr_iterator Tmp(*this);
101 ++(*this);
102 return Tmp;
103 }
104
105 friend bool operator==(specific_attr_iterator Left,
106 specific_attr_iterator Right) {
107 assert((Left.Current == nullptr) == (Right.Current == nullptr));
108 if (Left.Current < Right.Current)
109 Left.AdvanceToNext(Right.Current);
110 else
111 Right.AdvanceToNext(Left.Current);
112 return Left.Current == Right.Current;
113 }
114 friend bool operator!=(specific_attr_iterator Left,
115 specific_attr_iterator Right) {
116 return !(Left == Right);
117 }
118};
119
120template <typename SpecificAttr, typename Container>
121inline specific_attr_iterator<SpecificAttr, Container>
122 specific_attr_begin(const Container& container) {
123 return specific_attr_iterator<SpecificAttr, Container>(container.begin());
124}
125template <typename SpecificAttr, typename Container>
126inline specific_attr_iterator<SpecificAttr, Container>
127 specific_attr_end(const Container& container) {
128 return specific_attr_iterator<SpecificAttr, Container>(container.end());
129}
130
131template <typename SpecificAttr, typename Container>
132inline bool hasSpecificAttr(const Container& container) {
133 return specific_attr_begin<SpecificAttr>(container) !=
134 specific_attr_end<SpecificAttr>(container);
135}
136template <typename SpecificAttr, typename Container>
137inline SpecificAttr *getSpecificAttr(const Container& container) {
138 specific_attr_iterator<SpecificAttr, Container> i =
139 specific_attr_begin<SpecificAttr>(container);
140 if (i != specific_attr_end<SpecificAttr>(container))
141 return *i;
142 else
143 return nullptr;
144}
145
146} // namespace clang
147
148#endif // LLVM_CLANG_AST_ATTRITERATOR_H
149

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