1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef MarkedBlockSet_h
27#define MarkedBlockSet_h
28
29#include "MarkedBlock.h"
30#include "TinyBloomFilter.h"
31#include <wtf/HashSet.h>
32
33namespace JSC {
34
35class MarkedBlock;
36
37class MarkedBlockSet {
38public:
39 void add(MarkedBlock*);
40 void remove(MarkedBlock*);
41
42 TinyBloomFilter filter() const;
43 const HashSet<MarkedBlock*>& set() const;
44
45private:
46 void recomputeFilter();
47
48 TinyBloomFilter m_filter;
49 HashSet<MarkedBlock*> m_set;
50};
51
52inline void MarkedBlockSet::add(MarkedBlock* block)
53{
54 m_filter.add(reinterpret_cast<Bits>(block));
55 m_set.add(block);
56}
57
58inline void MarkedBlockSet::remove(MarkedBlock* block)
59{
60 unsigned oldCapacity = m_set.capacity();
61 m_set.remove(block);
62 if (m_set.capacity() != oldCapacity) // Indicates we've removed a lot of blocks.
63 recomputeFilter();
64}
65
66inline void MarkedBlockSet::recomputeFilter()
67{
68 TinyBloomFilter filter;
69 for (HashSet<MarkedBlock*>::iterator it = m_set.begin(); it != m_set.end(); ++it)
70 filter.add(reinterpret_cast<Bits>(*it));
71 m_filter = filter;
72}
73
74inline TinyBloomFilter MarkedBlockSet::filter() const
75{
76 return m_filter;
77}
78
79inline const HashSet<MarkedBlock*>& MarkedBlockSet::set() const
80{
81 return m_set;
82}
83
84} // namespace JSC
85
86#endif // MarkedBlockSet_h
87