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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/FastBitVector.h>
#include <wtf/NeverDestroyed.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace WTF {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(FastBitVector);
void FastBitVectorWordOwner::setEqualsSlow(const FastBitVectorWordOwner& other)
{
if (m_words)
FastBitVectorMalloc::free(m_words);
m_words = static_cast<uint32_t*>(FastBitVectorMalloc::malloc(other.arrayLength() * sizeof(uint32_t)));
m_numBits = other.m_numBits;
memcpySpan(wordsSpan(), other.wordsSpan());
}
void FastBitVectorWordOwner::resizeSlow(size_t numBits)
{
size_t newLength = fastBitVectorArrayLength(numBits);
size_t oldLength = arrayLength();
RELEASE_ASSERT(newLength >= oldLength);
// Use fastMalloc instead of fastRealloc because we expect the common
// use case for this method to be initializing the size of the bitvector.
auto newArray = unsafeMakeSpan(static_cast<uint32_t*>(FastBitVectorMalloc::malloc(newLength * sizeof(uint32_t))), newLength);
memcpySpan(newArray, wordsSpan());
zeroSpan(newArray.subspan(oldLength));
if (m_words)
FastBitVectorMalloc::free(m_words);
m_words = newArray.data();
}
void FastBitVector::clearRange(size_t begin, size_t end)
{
if (end - begin < 32) {
for (size_t i = begin; i < end; ++i)
at(i) = false;
return;
}
size_t endBeginSlop = (begin + 31) & ~31;
size_t beginEndSlop = end & ~31;
for (size_t i = begin; i < endBeginSlop; ++i)
at(i) = false;
for (size_t i = beginEndSlop; i < end; ++i)
at(i) = false;
for (size_t i = endBeginSlop / 32; i < beginEndSlop / 32; ++i)
m_words.word(i) = 0;
}
} // namespace WTF
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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