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
28namespace JSC {
29
30typedef uintptr_t Bits;
31
32class TinyBloomFilter {
33public:
34 TinyBloomFilter();
35
36 void add(Bits);
37 void add(TinyBloomFilter&);
38 bool ruleOut(Bits) const; // True for 0.
39 void reset();
40
41private:
42 Bits m_bits;
43};
44
45inline TinyBloomFilter::TinyBloomFilter()
46 : m_bits(0)
47{
48}
49
50inline void TinyBloomFilter::add(Bits bits)
51{
52 m_bits |= bits;
53}
54
55inline void TinyBloomFilter::add(TinyBloomFilter& other)
56{
57 m_bits |= other.m_bits;
58}
59
60inline bool TinyBloomFilter::ruleOut(Bits bits) const
61{
62 if (!bits)
63 return true;
64
65 if ((bits & m_bits) != bits)
66 return true;
67
68 return false;
69}
70
71inline void TinyBloomFilter::reset()
72{
73 m_bits = 0;
74}
75
76} // namespace JSC
77