1/*
2 * Copyright (C) 2016 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/FastBitVector.h>
28
29namespace WTF {
30
31void FastBitVectorWordOwner::setEqualsSlow(const FastBitVectorWordOwner& other)
32{
33 uint32_t* newArray = static_cast<uint32_t*>(
34 fastCalloc(other.arrayLength(), sizeof(uint32_t)));
35 memcpy(newArray, other.m_words, other.arrayLength() * sizeof(uint32_t));
36 if (m_words)
37 fastFree(m_words);
38 m_words = newArray;
39 m_numBits = other.m_numBits;
40}
41
42void FastBitVectorWordOwner::resizeSlow(size_t numBits)
43{
44 size_t newLength = fastBitVectorArrayLength(numBits);
45
46 RELEASE_ASSERT(newLength >= arrayLength());
47
48 // Use fastCalloc instead of fastRealloc because we expect the common
49 // use case for this method to be initializing the size of the bitvector.
50
51 uint32_t* newArray = static_cast<uint32_t*>(fastCalloc(newLength, sizeof(uint32_t)));
52 memcpy(newArray, m_words, arrayLength() * sizeof(uint32_t));
53 if (m_words)
54 fastFree(m_words);
55 m_words = newArray;
56}
57
58void FastBitVector::clearRange(size_t begin, size_t end)
59{
60 if (end - begin < 32) {
61 for (size_t i = begin; i < end; ++i)
62 at(i) = false;
63 return;
64 }
65
66 size_t endBeginSlop = (begin + 31) & ~31;
67 size_t beginEndSlop = end & ~31;
68
69 for (size_t i = begin; i < endBeginSlop; ++i)
70 at(i) = false;
71 for (size_t i = beginEndSlop; i < end; ++i)
72 at(i) = false;
73 for (size_t i = endBeginSlop / 32; i < beginEndSlop / 32; ++i)
74 m_words.word(i) = 0;
75}
76
77} // namespace WTF
78
79