This file is indexed.

/usr/include/llvm-3.9/llvm/ADT/ScopedHashTable.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
//===- ScopedHashTable.h - A simple scoped hash table -----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements an efficient scoped hash table, which is useful for
// things like dominator-based optimizations.  This allows clients to do things
// like this:
//
//  ScopedHashTable<int, int> HT;
//  {
//    ScopedHashTableScope<int, int> Scope1(HT);
//    HT.insert(0, 0);
//    HT.insert(1, 1);
//    {
//      ScopedHashTableScope<int, int> Scope2(HT);
//      HT.insert(0, 42);
//    }
//  }
//
// Looking up the value for "0" in the Scope2 block will return 42.  Looking
// up the value for 0 before 42 is inserted or after Scope2 is popped will
// return 0.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_SCOPEDHASHTABLE_H
#define LLVM_ADT_SCOPEDHASHTABLE_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/Allocator.h"

namespace llvm {

template <typename K, typename V, typename KInfo = DenseMapInfo<K>,
          typename AllocatorTy = MallocAllocator>
class ScopedHashTable;

template <typename K, typename V>
class ScopedHashTableVal {
  ScopedHashTableVal *NextInScope;
  ScopedHashTableVal *NextForKey;
  K Key;
  V Val;
  ScopedHashTableVal(const K &key, const V &val) : Key(key), Val(val) {}

public:
  const K &getKey() const { return Key; }
  const V &getValue() const { return Val; }
  V &getValue() { return Val; }

  ScopedHashTableVal *getNextForKey() { return NextForKey; }
  const ScopedHashTableVal *getNextForKey() const { return NextForKey; }
  ScopedHashTableVal *getNextInScope() { return NextInScope; }

  template <typename AllocatorTy>
  static ScopedHashTableVal *Create(ScopedHashTableVal *nextInScope,
                                    ScopedHashTableVal *nextForKey,
                                    const K &key, const V &val,
                                    AllocatorTy &Allocator) {
    ScopedHashTableVal *New = Allocator.template Allocate<ScopedHashTableVal>();
    // Set up the value.
    new (New) ScopedHashTableVal(key, val);
    New->NextInScope = nextInScope;
    New->NextForKey = nextForKey;
    return New;
  }

  template <typename AllocatorTy> void Destroy(AllocatorTy &Allocator) {
    // Free memory referenced by the item.
    this->~ScopedHashTableVal();
    Allocator.Deallocate(this);
  }
};

template <typename K, typename V, typename KInfo = DenseMapInfo<K>,
          typename AllocatorTy = MallocAllocator>
class ScopedHashTableScope {
  /// HT - The hashtable that we are active for.
  ScopedHashTable<K, V, KInfo, AllocatorTy> &HT;

  /// PrevScope - This is the scope that we are shadowing in HT.
  ScopedHashTableScope *PrevScope;

  /// LastValInScope - This is the last value that was inserted for this scope
  /// or null if none have been inserted yet.
  ScopedHashTableVal<K, V> *LastValInScope;
  void operator=(ScopedHashTableScope &) = delete;
  ScopedHashTableScope(ScopedHashTableScope &) = delete;

public:
  ScopedHashTableScope(ScopedHashTable<K, V, KInfo, AllocatorTy> &HT);
  ~ScopedHashTableScope();

  ScopedHashTableScope *getParentScope() { return PrevScope; }
  const ScopedHashTableScope *getParentScope() const { return PrevScope; }

private:
  friend class ScopedHashTable<K, V, KInfo, AllocatorTy>;
  ScopedHashTableVal<K, V> *getLastValInScope() {
    return LastValInScope;
  }
  void setLastValInScope(ScopedHashTableVal<K, V> *Val) {
    LastValInScope = Val;
  }
};

template <typename K, typename V, typename KInfo = DenseMapInfo<K>>
class ScopedHashTableIterator {
  ScopedHashTableVal<K, V> *Node;

public:
  ScopedHashTableIterator(ScopedHashTableVal<K, V> *node) : Node(node) {}

  V &operator*() const {
    assert(Node && "Dereference end()");
    return Node->getValue();
  }
  V *operator->() const {
    return &Node->getValue();
  }

  bool operator==(const ScopedHashTableIterator &RHS) const {
    return Node == RHS.Node;
  }
  bool operator!=(const ScopedHashTableIterator &RHS) const {
    return Node != RHS.Node;
  }

  inline ScopedHashTableIterator& operator++() {          // Preincrement
    assert(Node && "incrementing past end()");
    Node = Node->getNextForKey();
    return *this;
  }
  ScopedHashTableIterator operator++(int) {        // Postincrement
    ScopedHashTableIterator tmp = *this; ++*this; return tmp;
  }
};

template <typename K, typename V, typename KInfo, typename AllocatorTy>
class ScopedHashTable {
public:
  /// ScopeTy - This is a helpful typedef that allows clients to get easy access
  /// to the name of the scope for this hash table.
  typedef ScopedHashTableScope<K, V, KInfo, AllocatorTy> ScopeTy;
  typedef unsigned size_type;

private:
  typedef ScopedHashTableVal<K, V> ValTy;
  DenseMap<K, ValTy*, KInfo> TopLevelMap;
  ScopeTy *CurScope;

  AllocatorTy Allocator;

  ScopedHashTable(const ScopedHashTable &); // NOT YET IMPLEMENTED
  void operator=(const ScopedHashTable &);  // NOT YET IMPLEMENTED
  friend class ScopedHashTableScope<K, V, KInfo, AllocatorTy>;

public:
  ScopedHashTable() : CurScope(nullptr) {}
  ScopedHashTable(AllocatorTy A) : CurScope(0), Allocator(A) {}
  ~ScopedHashTable() {
    assert(!CurScope && TopLevelMap.empty() && "Scope imbalance!");
  }

  /// Access to the allocator.
  AllocatorTy &getAllocator() { return Allocator; }
  const AllocatorTy &getAllocator() const { return Allocator; }

  /// Return 1 if the specified key is in the table, 0 otherwise.
  size_type count(const K &Key) const {
    return TopLevelMap.count(Key);
  }

  V lookup(const K &Key) {
    typename DenseMap<K, ValTy*, KInfo>::iterator I = TopLevelMap.find(Key);
    if (I != TopLevelMap.end())
      return I->second->getValue();

    return V();
  }

  void insert(const K &Key, const V &Val) {
    insertIntoScope(CurScope, Key, Val);
  }

  typedef ScopedHashTableIterator<K, V, KInfo> iterator;

  iterator end() { return iterator(0); }

  iterator begin(const K &Key) {
    typename DenseMap<K, ValTy*, KInfo>::iterator I =
      TopLevelMap.find(Key);
    if (I == TopLevelMap.end()) return end();
    return iterator(I->second);
  }

  ScopeTy *getCurScope() { return CurScope; }
  const ScopeTy *getCurScope() const { return CurScope; }

  /// insertIntoScope - This inserts the specified key/value at the specified
  /// (possibly not the current) scope.  While it is ok to insert into a scope
  /// that isn't the current one, it isn't ok to insert *underneath* an existing
  /// value of the specified key.
  void insertIntoScope(ScopeTy *S, const K &Key, const V &Val) {
    assert(S && "No scope active!");
    ScopedHashTableVal<K, V> *&KeyEntry = TopLevelMap[Key];
    KeyEntry = ValTy::Create(S->getLastValInScope(), KeyEntry, Key, Val,
                             Allocator);
    S->setLastValInScope(KeyEntry);
  }
};

/// ScopedHashTableScope ctor - Install this as the current scope for the hash
/// table.
template <typename K, typename V, typename KInfo, typename Allocator>
ScopedHashTableScope<K, V, KInfo, Allocator>::
  ScopedHashTableScope(ScopedHashTable<K, V, KInfo, Allocator> &ht) : HT(ht) {
  PrevScope = HT.CurScope;
  HT.CurScope = this;
  LastValInScope = nullptr;
}

template <typename K, typename V, typename KInfo, typename Allocator>
ScopedHashTableScope<K, V, KInfo, Allocator>::~ScopedHashTableScope() {
  assert(HT.CurScope == this && "Scope imbalance!");
  HT.CurScope = PrevScope;

  // Pop and delete all values corresponding to this scope.
  while (ScopedHashTableVal<K, V> *ThisEntry = LastValInScope) {
    // Pop this value out of the TopLevelMap.
    if (!ThisEntry->getNextForKey()) {
      assert(HT.TopLevelMap[ThisEntry->getKey()] == ThisEntry &&
             "Scope imbalance!");
      HT.TopLevelMap.erase(ThisEntry->getKey());
    } else {
      ScopedHashTableVal<K, V> *&KeyEntry = HT.TopLevelMap[ThisEntry->getKey()];
      assert(KeyEntry == ThisEntry && "Scope imbalance!");
      KeyEntry = ThisEntry->getNextForKey();
    }

    // Pop this value out of the scope.
    LastValInScope = ThisEntry->getNextInScope();

    // Delete this entry.
    ThisEntry->Destroy(HT.getAllocator());
  }
}

} // end namespace llvm

#endif