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/*
* Copyright (C) 2012 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 "IncrementalSweeper.h"
#include "APIShims.h"
#include "Heap.h"
#include "JSObject.h"
#include "JSString.h"
#include "MarkedBlock.h"
#include "ScopeChain.h"
#include <wtf/HashSet.h>
#include <wtf/WTFThreadData.h>
namespace JSC {
#if USE(CF)
static const CFTimeInterval sweepTimeSlice = .01; // seconds
static const CFTimeInterval sweepTimeTotal = .10;
static const CFTimeInterval sweepTimeMultiplier = 1.0 / sweepTimeTotal;
void IncrementalSweeper::doWork()
{
doSweep(WTF::monotonicallyIncreasingTime());
}
IncrementalSweeper::IncrementalSweeper(Heap* heap, CFRunLoopRef runLoop)
: HeapTimer(heap->globalData(), runLoop)
, m_currentBlockToSweepIndex(0)
{
}
IncrementalSweeper* IncrementalSweeper::create(Heap* heap)
{
return new IncrementalSweeper(heap, CFRunLoopGetCurrent());
}
void IncrementalSweeper::scheduleTimer()
{
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + (sweepTimeSlice * sweepTimeMultiplier));
}
void IncrementalSweeper::cancelTimer()
{
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade);
}
void IncrementalSweeper::doSweep(double sweepBeginTime)
{
while (m_currentBlockToSweepIndex < m_blocksToSweep.size()) {
MarkedBlock* block = m_blocksToSweep[m_currentBlockToSweepIndex++];
if (!block->needsSweeping())
continue;
block->sweep();
m_globalData->heap.objectSpace().freeOrShrinkBlock(block);
CFTimeInterval elapsedTime = WTF::monotonicallyIncreasingTime() - sweepBeginTime;
if (elapsedTime < sweepTimeSlice)
continue;
scheduleTimer();
return;
}
m_blocksToSweep.clear();
cancelTimer();
}
void IncrementalSweeper::startSweeping(const HashSet<MarkedBlock*>& blockSnapshot)
{
WTF::copyToVector(blockSnapshot, m_blocksToSweep);
m_currentBlockToSweepIndex = 0;
scheduleTimer();
}
#else
IncrementalSweeper::IncrementalSweeper(JSGlobalData* globalData)
: HeapTimer(globalData)
{
}
void IncrementalSweeper::doWork()
{
}
IncrementalSweeper* IncrementalSweeper::create(Heap* heap)
{
return new IncrementalSweeper(heap->globalData());
}
void IncrementalSweeper::startSweeping(const HashSet<MarkedBlock*>&)
{
}
#endif
} // namespace JSC
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