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Copy pathFTLDataSection.cpp
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64 lines (50 loc) · 2.29 KB
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/*
* Copyright (C) 2014 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 "FTLDataSection.h"
#if ENABLE(FTL_JIT)
#include <wtf/Assertions.h>
#include <wtf/DataLog.h>
#include <wtf/FastMalloc.h>
namespace JSC { namespace FTL {
DataSection::DataSection(size_t size, unsigned alignment)
: m_size(size)
{
RELEASE_ASSERT(WTF::bitCount(alignment) == 1);
const unsigned nativeAlignment = 8;
alignment = std::max(nativeAlignment, alignment);
size_t allocatedSize = size + alignment - nativeAlignment;
m_allocationBase = fastMalloc(allocatedSize);
m_base = bitwise_cast<void*>(
(bitwise_cast<uintptr_t>(m_allocationBase) + alignment - 1) & ~static_cast<uintptr_t>(alignment - 1));
RELEASE_ASSERT(!(bitwise_cast<uintptr_t>(m_base) & (alignment - 1)));
RELEASE_ASSERT(bitwise_cast<uintptr_t>(m_base) + size <= bitwise_cast<uintptr_t>(m_allocationBase) + allocatedSize);
}
DataSection::~DataSection()
{
fastFree(m_allocationBase);
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)