IncrementalSweeper.cpp [plain text]
#include "config.h"
#include "IncrementalSweeper.h"
#include "Heap.h"
#include "JSObject.h"
#include "JSString.h"
#include "MarkedBlock.h"
#include "JSCInlines.h"
#include <wtf/HashSet.h>
#include <wtf/WTFThreadData.h>
#if PLATFORM(EFL)
#include <Ecore.h>
#include <wtf/CurrentTime.h>
#elif USE(GLIB)
#include <glib.h>
#endif
namespace JSC {
#if USE(CF) || PLATFORM(EFL) || USE(GLIB)
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_blocksToSweep(heap->m_blockSnapshot)
{
}
void IncrementalSweeper::scheduleTimer()
{
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + (sweepTimeSlice * sweepTimeMultiplier));
}
void IncrementalSweeper::cancelTimer()
{
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade);
}
#elif PLATFORM(EFL)
IncrementalSweeper::IncrementalSweeper(Heap* heap)
: HeapTimer(heap->vm())
, m_blocksToSweep(heap->m_blockSnapshot)
{
}
void IncrementalSweeper::scheduleTimer()
{
if (ecore_timer_freeze_get(m_timer))
ecore_timer_thaw(m_timer);
double targetTime = currentTime() + (sweepTimeSlice * sweepTimeMultiplier);
ecore_timer_interval_set(m_timer, targetTime);
}
void IncrementalSweeper::cancelTimer()
{
ecore_timer_freeze(m_timer);
}
#elif USE(GLIB)
IncrementalSweeper::IncrementalSweeper(Heap* heap)
: HeapTimer(heap->vm())
, m_blocksToSweep(heap->m_blockSnapshot)
{
}
void IncrementalSweeper::scheduleTimer()
{
auto delayDuration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::duration<double>(sweepTimeSlice * sweepTimeMultiplier));
gint64 currentTime = g_get_monotonic_time();
gint64 targetTime = currentTime + std::min<gint64>(G_MAXINT64 - currentTime, delayDuration.count());
ASSERT(targetTime >= currentTime);
g_source_set_ready_time(m_timer.get(), targetTime);
}
void IncrementalSweeper::cancelTimer()
{
g_source_set_ready_time(m_timer.get(), -1);
}
#endif
void IncrementalSweeper::doWork()
{
doSweep(WTF::monotonicallyIncreasingTime());
}
void IncrementalSweeper::doSweep(double sweepBeginTime)
{
while (sweepNextBlock()) {
double elapsedTime = WTF::monotonicallyIncreasingTime() - sweepBeginTime;
if (elapsedTime < sweepTimeSlice)
continue;
scheduleTimer();
return;
}
m_blocksToSweep.clear();
cancelTimer();
}
bool IncrementalSweeper::sweepNextBlock()
{
while (!m_blocksToSweep.isEmpty()) {
MarkedBlock* block = m_blocksToSweep.takeLast();
if (!block->needsSweeping())
continue;
DeferGCForAWhile deferGC(m_vm->heap);
block->sweep();
m_vm->heap.objectSpace().freeOrShrinkBlock(block);
return true;
}
return m_vm->heap.sweepNextLogicallyEmptyWeakBlock();
}
void IncrementalSweeper::startSweeping()
{
scheduleTimer();
}
void IncrementalSweeper::willFinishSweeping()
{
m_blocksToSweep.clear();
if (m_vm)
cancelTimer();
}
#else
IncrementalSweeper::IncrementalSweeper(Heap* heap)
: HeapTimer(heap->vm())
{
}
void IncrementalSweeper::doWork()
{
}
void IncrementalSweeper::startSweeping()
{
}
void IncrementalSweeper::willFinishSweeping()
{
}
bool IncrementalSweeper::sweepNextBlock()
{
return false;
}
#endif
}