This file is indexed.

/usr/include/llvm-3.9/llvm/ADT/SmallSet.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
//===- llvm/ADT/SmallSet.h - 'Normally small' sets --------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the SmallSet class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_SMALLSET_H
#define LLVM_ADT_SMALLSET_H

#include "llvm/ADT/None.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include <set>

namespace llvm {

/// SmallSet - This maintains a set of unique values, optimizing for the case
/// when the set is small (less than N).  In this case, the set can be
/// maintained with no mallocs.  If the set gets large, we expand to using an
/// std::set to maintain reasonable lookup times.
///
/// Note that this set does not provide a way to iterate over members in the
/// set.
template <typename T, unsigned N,  typename C = std::less<T> >
class SmallSet {
  /// Use a SmallVector to hold the elements here (even though it will never
  /// reach its 'large' stage) to avoid calling the default ctors of elements
  /// we will never use.
  SmallVector<T, N> Vector;
  std::set<T, C> Set;
  typedef typename SmallVector<T, N>::const_iterator VIterator;
  typedef typename SmallVector<T, N>::iterator mutable_iterator;

  // In small mode SmallPtrSet uses linear search for the elements, so it is
  // not a good idea to choose this value too high. You may consider using a
  // DenseSet<> instead if you expect many elements in the set.
  static_assert(N <= 32, "N should be small");

public:
  typedef size_t size_type;
  SmallSet() {}

  bool LLVM_ATTRIBUTE_UNUSED_RESULT empty() const {
    return Vector.empty() && Set.empty();
  }

  size_type size() const {
    return isSmall() ? Vector.size() : Set.size();
  }

  /// count - Return 1 if the element is in the set, 0 otherwise.
  size_type count(const T &V) const {
    if (isSmall()) {
      // Since the collection is small, just do a linear search.
      return vfind(V) == Vector.end() ? 0 : 1;
    } else {
      return Set.count(V);
    }
  }

  /// insert - Insert an element into the set if it isn't already there.
  /// Returns true if the element is inserted (it was not in the set before).
  /// The first value of the returned pair is unused and provided for
  /// partial compatibility with the standard library self-associative container
  /// concept.
  // FIXME: Add iterators that abstract over the small and large form, and then
  // return those here.
  std::pair<NoneType, bool> insert(const T &V) {
    if (!isSmall())
      return std::make_pair(None, Set.insert(V).second);

    VIterator I = vfind(V);
    if (I != Vector.end())    // Don't reinsert if it already exists.
      return std::make_pair(None, false);
    if (Vector.size() < N) {
      Vector.push_back(V);
      return std::make_pair(None, true);
    }

    // Otherwise, grow from vector to set.
    while (!Vector.empty()) {
      Set.insert(Vector.back());
      Vector.pop_back();
    }
    Set.insert(V);
    return std::make_pair(None, true);
  }

  template <typename IterT>
  void insert(IterT I, IterT E) {
    for (; I != E; ++I)
      insert(*I);
  }

  bool erase(const T &V) {
    if (!isSmall())
      return Set.erase(V);
    for (mutable_iterator I = Vector.begin(), E = Vector.end(); I != E; ++I)
      if (*I == V) {
        Vector.erase(I);
        return true;
      }
    return false;
  }

  void clear() {
    Vector.clear();
    Set.clear();
  }

private:
  bool isSmall() const { return Set.empty(); }

  VIterator vfind(const T &V) const {
    for (VIterator I = Vector.begin(), E = Vector.end(); I != E; ++I)
      if (*I == V)
        return I;
    return Vector.end();
  }
};

/// If this set is of pointer values, transparently switch over to using
/// SmallPtrSet for performance.
template <typename PointeeType, unsigned N>
class SmallSet<PointeeType*, N> : public SmallPtrSet<PointeeType*, N> {};

} // end namespace llvm

#endif