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/*
* Copyright (C) 2016-2017 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 "FreeList.h"
namespace JSC {
FreeList::FreeList(unsigned cellSize)
: m_cellSize(cellSize)
{
}
FreeList::~FreeList()
{
}
void FreeList::clear()
{
m_intervalStart = nullptr;
m_intervalEnd = nullptr;
m_nextInterval = bitwise_cast<FreeCell*>(static_cast<uintptr_t>(1));
m_secret = 0;
m_originalSize = 0;
}
void FreeList::initialize(FreeCell* start, uint64_t secret, unsigned bytes)
{
if (UNLIKELY(!start)) {
clear();
return;
}
m_secret = secret;
m_nextInterval = start;
FreeCell::advance(m_secret, m_nextInterval, m_intervalStart, m_intervalEnd);
m_originalSize = bytes;
}
bool FreeList::contains(HeapCell* target) const
{
char* targetPtr = bitwise_cast<char*>(target);
if (m_intervalStart <= targetPtr && targetPtr < m_intervalEnd)
return true;
FreeCell* candidate = nextInterval();
while (!isSentinel(candidate)) {
char* start;
char* end;
FreeCell::advance(m_secret, candidate, start, end);
if (start <= targetPtr && targetPtr < end)
return true;
}
return false;
}
void FreeList::dump(PrintStream& out) const
{
out.print("{nextInterval = ", RawPointer(nextInterval()), ", secret = ", m_secret, ", intervalStart = ", RawPointer(m_intervalStart), ", intervalEnd = ", RawPointer(m_intervalEnd), ", originalSize = ", m_originalSize, "}");
}
} // namespace JSC
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