IncrementalSweeper.cpp [plain text]
#include "config.h"
#include "IncrementalSweeper.h"
#include "APIShims.h"
#include "Heap.h"
#include "JSObject.h"
#include "JSString.h"
#include "MarkedBlock.h"
#include <wtf/HashSet.h>
#include <wtf/WTFThreadData.h>
namespace JSC {
#if USE(CF) || PLATFORM(BLACKBERRY) || PLATFORM(QT)
static const double sweepTimeSlice = .01; static const double sweepTimeTotal = .10;
static const double sweepTimeMultiplier = 1.0 / sweepTimeTotal;
#if USE(CF)
IncrementalSweeper::IncrementalSweeper(Heap* heap, CFRunLoopRef runLoop)
: HeapTimer(heap->vm(), runLoop)
, m_currentBlockToSweepIndex(0)
, m_blocksToSweep(heap->m_blockSnapshot)
{
}
PassOwnPtr<IncrementalSweeper> IncrementalSweeper::create(Heap* heap)
{
return adoptPtr(new IncrementalSweeper(heap, CFRunLoopGetCurrent()));
}
void IncrementalSweeper::scheduleTimer()
{
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + (sweepTimeSlice * sweepTimeMultiplier));
}
void IncrementalSweeper::cancelTimer()
{
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade);
}
#elif PLATFORM(BLACKBERRY) || PLATFORM(QT)
IncrementalSweeper::IncrementalSweeper(Heap* heap)
: HeapTimer(heap->vm())
, m_currentBlockToSweepIndex(0)
, m_blocksToSweep(heap->m_blockSnapshot)
{
}
PassOwnPtr<IncrementalSweeper> IncrementalSweeper::create(Heap* heap)
{
return adoptPtr(new IncrementalSweeper(heap));
}
void IncrementalSweeper::scheduleTimer()
{
#if PLATFORM(QT)
m_timer.start(sweepTimeSlice * sweepTimeMultiplier * 1000, this);
#else
m_timer.start(sweepTimeSlice * sweepTimeMultiplier);
#endif
}
void IncrementalSweeper::cancelTimer()
{
m_timer.stop();
}
#endif
void IncrementalSweeper::doWork()
{
doSweep(WTF::monotonicallyIncreasingTime());
}
void IncrementalSweeper::doSweep(double sweepBeginTime)
{
while (m_currentBlockToSweepIndex < m_blocksToSweep.size()) {
sweepNextBlock();
double elapsedTime = WTF::monotonicallyIncreasingTime() - sweepBeginTime;
if (elapsedTime < sweepTimeSlice)
continue;
scheduleTimer();
return;
}
m_blocksToSweep.clear();
cancelTimer();
}
void IncrementalSweeper::sweepNextBlock()
{
while (m_currentBlockToSweepIndex < m_blocksToSweep.size()) {
MarkedBlock* block = m_blocksToSweep[m_currentBlockToSweepIndex++];
if (!block->needsSweeping())
continue;
block->sweep();
m_vm->heap.objectSpace().freeOrShrinkBlock(block);
return;
}
}
void IncrementalSweeper::startSweeping(Vector<MarkedBlock*>& blockSnapshot)
{
m_blocksToSweep = blockSnapshot;
m_currentBlockToSweepIndex = 0;
scheduleTimer();
}
void IncrementalSweeper::willFinishSweeping()
{
m_currentBlockToSweepIndex = 0;
m_blocksToSweep.clear();
if (m_vm)
cancelTimer();
}
#else
IncrementalSweeper::IncrementalSweeper(VM* vm)
: HeapTimer(vm)
{
}
void IncrementalSweeper::doWork()
{
}
PassOwnPtr<IncrementalSweeper> IncrementalSweeper::create(Heap* heap)
{
return adoptPtr(new IncrementalSweeper(heap->vm()));
}
void IncrementalSweeper::startSweeping(Vector<MarkedBlock*>&)
{
}
void IncrementalSweeper::willFinishSweeping()
{
}
void IncrementalSweeper::sweepNextBlock()
{
}
#endif
}