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#pragma once
27
28#include "MarkedBlock.h"
29#include "TinyBloomFilter.h"
30#include <wtf/HashSet.h>
31
32namespace JSC {
33
34class MarkedBlock;
35
36class MarkedBlockSet {
37public:
38 void add(MarkedBlock*);
39 void remove(MarkedBlock*);
40
41 TinyBloomFilter filter() const;
42 const HashSet<MarkedBlock*>& set() const;
43
44private:
45 void recomputeFilter();
46
47 TinyBloomFilter m_filter;
48 HashSet<MarkedBlock*> m_set;
49};
50
51inline void MarkedBlockSet::add(MarkedBlock* block)
52{
53 m_filter.add(reinterpret_cast<Bits>(block));
54 m_set.add(block);
55}
56
57inline void MarkedBlockSet::remove(MarkedBlock* block)
58{
59 unsigned oldCapacity = m_set.capacity();
60 m_set.remove(block);
61 if (m_set.capacity() != oldCapacity) // Indicates we've removed a lot of blocks.
62 recomputeFilter();
63}
64
65inline void MarkedBlockSet::recomputeFilter()
66{
67 TinyBloomFilter filter;
68 for (HashSet<MarkedBlock*>::iterator it = m_set.begin(); it != m_set.end(); ++it)
69 filter.add(reinterpret_cast<Bits>(*it));
70 m_filter = filter;
71}
72
73inline TinyBloomFilter MarkedBlockSet::filter() const
74{
75 return m_filter;
76}
77
78inline const HashSet<MarkedBlock*>& MarkedBlockSet::set() const
79{
80 return m_set;
81}
82
83} // namespace JSC
84