aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/llvm16/include/llvm/ADT/DenseSet.h
blob: 823535ec1474efa5ab22aabff6c0c9fa01e04021 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
#pragma once

#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif

//===- llvm/ADT/DenseSet.h - Dense probed hash table ------------*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file defines the DenseSet and SmallDenseSet classes.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_DENSESET_H
#define LLVM_ADT_DENSESET_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/type_traits.h"
#include <cstddef>
#include <initializer_list>
#include <iterator>
#include <utility>

namespace llvm {

namespace detail {

struct DenseSetEmpty {};

// Use the empty base class trick so we can create a DenseMap where the buckets
// contain only a single item.
template <typename KeyT> class DenseSetPair : public DenseSetEmpty {
  KeyT key;

public:
  KeyT &getFirst() { return key; }
  const KeyT &getFirst() const { return key; }
  DenseSetEmpty &getSecond() { return *this; }
  const DenseSetEmpty &getSecond() const { return *this; }
};

/// Base class for DenseSet and DenseSmallSet.
///
/// MapTy should be either
///
///   DenseMap<ValueT, detail::DenseSetEmpty, ValueInfoT,
///            detail::DenseSetPair<ValueT>>
///
/// or the equivalent SmallDenseMap type.  ValueInfoT must implement the
/// DenseMapInfo "concept".
template <typename ValueT, typename MapTy, typename ValueInfoT>
class DenseSetImpl {
  static_assert(sizeof(typename MapTy::value_type) == sizeof(ValueT),
                "DenseMap buckets unexpectedly large!");
  MapTy TheMap;

  template <typename T>
  using const_arg_type_t = typename const_pointer_or_const_ref<T>::type;

public:
  using key_type = ValueT;
  using value_type = ValueT;
  using size_type = unsigned;

  explicit DenseSetImpl(unsigned InitialReserve = 0) : TheMap(InitialReserve) {}

  template <typename InputIt>
  DenseSetImpl(const InputIt &I, const InputIt &E)
      : DenseSetImpl(PowerOf2Ceil(std::distance(I, E))) {
    insert(I, E);
  }

  DenseSetImpl(std::initializer_list<ValueT> Elems)
      : DenseSetImpl(PowerOf2Ceil(Elems.size())) {
    insert(Elems.begin(), Elems.end());
  }

  bool empty() const { return TheMap.empty(); }
  size_type size() const { return TheMap.size(); }
  size_t getMemorySize() const { return TheMap.getMemorySize(); }

  /// Grow the DenseSet so that it has at least Size buckets. Will not shrink
  /// the Size of the set.
  void resize(size_t Size) { TheMap.resize(Size); }

  /// Grow the DenseSet so that it can contain at least \p NumEntries items
  /// before resizing again.
  void reserve(size_t Size) { TheMap.reserve(Size); }

  void clear() {
    TheMap.clear();
  }

  /// Return 1 if the specified key is in the set, 0 otherwise.
  size_type count(const_arg_type_t<ValueT> V) const {
    return TheMap.count(V);
  }

  bool erase(const ValueT &V) {
    return TheMap.erase(V);
  }

  void swap(DenseSetImpl &RHS) { TheMap.swap(RHS.TheMap); }

  // Iterators.

  class ConstIterator;

  class Iterator {
    typename MapTy::iterator I;
    friend class DenseSetImpl;
    friend class ConstIterator;

  public:
    using difference_type = typename MapTy::iterator::difference_type;
    using value_type = ValueT;
    using pointer = value_type *;
    using reference = value_type &;
    using iterator_category = std::forward_iterator_tag;

    Iterator() = default;
    Iterator(const typename MapTy::iterator &i) : I(i) {}

    ValueT &operator*() { return I->getFirst(); }
    const ValueT &operator*() const { return I->getFirst(); }
    ValueT *operator->() { return &I->getFirst(); }
    const ValueT *operator->() const { return &I->getFirst(); }

    Iterator& operator++() { ++I; return *this; }
    Iterator operator++(int) { auto T = *this; ++I; return T; }
    friend bool operator==(const Iterator &X, const Iterator &Y) {
      return X.I == Y.I;
    }
    friend bool operator!=(const Iterator &X, const Iterator &Y) {
      return X.I != Y.I;
    }
  };

  class ConstIterator {
    typename MapTy::const_iterator I;
    friend class DenseSetImpl;
    friend class Iterator;

  public:
    using difference_type = typename MapTy::const_iterator::difference_type;
    using value_type = ValueT;
    using pointer = const value_type *;
    using reference = const value_type &;
    using iterator_category = std::forward_iterator_tag;

    ConstIterator() = default;
    ConstIterator(const Iterator &B) : I(B.I) {}
    ConstIterator(const typename MapTy::const_iterator &i) : I(i) {}

    const ValueT &operator*() const { return I->getFirst(); }
    const ValueT *operator->() const { return &I->getFirst(); }

    ConstIterator& operator++() { ++I; return *this; }
    ConstIterator operator++(int) { auto T = *this; ++I; return T; }
    friend bool operator==(const ConstIterator &X, const ConstIterator &Y) {
      return X.I == Y.I;
    }
    friend bool operator!=(const ConstIterator &X, const ConstIterator &Y) {
      return X.I != Y.I;
    }
  };

  using iterator = Iterator;
  using const_iterator = ConstIterator;

  iterator begin() { return Iterator(TheMap.begin()); }
  iterator end() { return Iterator(TheMap.end()); }

  const_iterator begin() const { return ConstIterator(TheMap.begin()); }
  const_iterator end() const { return ConstIterator(TheMap.end()); }

  iterator find(const_arg_type_t<ValueT> V) { return Iterator(TheMap.find(V)); }
  const_iterator find(const_arg_type_t<ValueT> V) const {
    return ConstIterator(TheMap.find(V));
  }

  /// Check if the set contains the given element.
  bool contains(const_arg_type_t<ValueT> V) const {
    return TheMap.find(V) != TheMap.end();
  }

  /// Alternative version of find() which allows a different, and possibly less
  /// expensive, key type.
  /// The DenseMapInfo is responsible for supplying methods
  /// getHashValue(LookupKeyT) and isEqual(LookupKeyT, KeyT) for each key type
  /// used.
  template <class LookupKeyT>
  iterator find_as(const LookupKeyT &Val) {
    return Iterator(TheMap.find_as(Val));
  }
  template <class LookupKeyT>
  const_iterator find_as(const LookupKeyT &Val) const {
    return ConstIterator(TheMap.find_as(Val));
  }

  void erase(Iterator I) { return TheMap.erase(I.I); }
  void erase(ConstIterator CI) { return TheMap.erase(CI.I); }

  std::pair<iterator, bool> insert(const ValueT &V) {
    detail::DenseSetEmpty Empty;
    return TheMap.try_emplace(V, Empty);
  }

  std::pair<iterator, bool> insert(ValueT &&V) {
    detail::DenseSetEmpty Empty;
    return TheMap.try_emplace(std::move(V), Empty);
  }

  /// Alternative version of insert that uses a different (and possibly less
  /// expensive) key type.
  template <typename LookupKeyT>
  std::pair<iterator, bool> insert_as(const ValueT &V,
                                      const LookupKeyT &LookupKey) {
    return TheMap.insert_as({V, detail::DenseSetEmpty()}, LookupKey);
  }
  template <typename LookupKeyT>
  std::pair<iterator, bool> insert_as(ValueT &&V, const LookupKeyT &LookupKey) {
    return TheMap.insert_as({std::move(V), detail::DenseSetEmpty()}, LookupKey);
  }

  // Range insertion of values.
  template<typename InputIt>
  void insert(InputIt I, InputIt E) {
    for (; I != E; ++I)
      insert(*I);
  }
};

/// Equality comparison for DenseSet.
///
/// Iterates over elements of LHS confirming that each element is also a member
/// of RHS, and that RHS contains no additional values.
/// Equivalent to N calls to RHS.count. Amortized complexity is linear, worst
/// case is O(N^2) (if every hash collides).
template <typename ValueT, typename MapTy, typename ValueInfoT>
bool operator==(const DenseSetImpl<ValueT, MapTy, ValueInfoT> &LHS,
                const DenseSetImpl<ValueT, MapTy, ValueInfoT> &RHS) {
  if (LHS.size() != RHS.size())
    return false;

  for (auto &E : LHS)
    if (!RHS.count(E))
      return false;

  return true;
}

/// Inequality comparison for DenseSet.
///
/// Equivalent to !(LHS == RHS). See operator== for performance notes.
template <typename ValueT, typename MapTy, typename ValueInfoT>
bool operator!=(const DenseSetImpl<ValueT, MapTy, ValueInfoT> &LHS,
                const DenseSetImpl<ValueT, MapTy, ValueInfoT> &RHS) {
  return !(LHS == RHS);
}

} // end namespace detail

/// Implements a dense probed hash-table based set.
template <typename ValueT, typename ValueInfoT = DenseMapInfo<ValueT>>
class DenseSet : public detail::DenseSetImpl<
                     ValueT, DenseMap<ValueT, detail::DenseSetEmpty, ValueInfoT,
                                      detail::DenseSetPair<ValueT>>,
                     ValueInfoT> {
  using BaseT =
      detail::DenseSetImpl<ValueT,
                           DenseMap<ValueT, detail::DenseSetEmpty, ValueInfoT,
                                    detail::DenseSetPair<ValueT>>,
                           ValueInfoT>;

public:
  using BaseT::BaseT;
};

/// Implements a dense probed hash-table based set with some number of buckets
/// stored inline.
template <typename ValueT, unsigned InlineBuckets = 4,
          typename ValueInfoT = DenseMapInfo<ValueT>>
class SmallDenseSet
    : public detail::DenseSetImpl<
          ValueT, SmallDenseMap<ValueT, detail::DenseSetEmpty, InlineBuckets,
                                ValueInfoT, detail::DenseSetPair<ValueT>>,
          ValueInfoT> {
  using BaseT = detail::DenseSetImpl<
      ValueT, SmallDenseMap<ValueT, detail::DenseSetEmpty, InlineBuckets,
                            ValueInfoT, detail::DenseSetPair<ValueT>>,
      ValueInfoT>;

public:
  using BaseT::BaseT;
};

} // end namespace llvm

#endif // LLVM_ADT_DENSESET_H

#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif