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/*
* Copyright (C) 2010-2017 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "GCActivityCallback.h"
#include "HeapInlines.h"
#include "JSLock.h"
#include "JSObject.h"
#include "VM.h"
namespace JSC {
bool GCActivityCallback::s_shouldCreateGCTimer = true;
const double timerSlop = 2.0; // Fudge factor to avoid performance cost of resetting timer.
GCActivityCallback::GCActivityCallback(Heap* heap)
: GCActivityCallback(heap->vm())
{
}
void GCActivityCallback::doWork()
{
Heap* heap = &m_vm->heap;
if (!isEnabled())
return;
JSLockHolder locker(m_vm);
if (heap->isDeferred()) {
scheduleTimer(0_s);
return;
}
doCollection();
}
#if USE(CF)
void GCActivityCallback::scheduleTimer(Seconds newDelay)
{
if (newDelay * timerSlop > m_delay)
return;
Seconds delta = m_delay - newDelay;
m_delay = newDelay;
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFRunLoopTimerGetNextFireDate(m_timer.get()) - delta.seconds());
}
void GCActivityCallback::cancelTimer()
{
m_delay = s_decade;
CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade.seconds());
}
MonotonicTime GCActivityCallback::nextFireTime()
{
return MonotonicTime::now() + Seconds(CFRunLoopTimerGetNextFireDate(m_timer.get()) - CFAbsoluteTimeGetCurrent());
}
#else
void GCActivityCallback::scheduleTimer(Seconds newDelay)
{
if (newDelay * timerSlop > m_delay)
return;
Seconds delta = m_delay - newDelay;
m_delay = newDelay;
Seconds secondsUntilFire = m_timer.secondsUntilFire();
m_timer.startOneShot(std::max<Seconds>(secondsUntilFire - delta, 0_s));
}
void GCActivityCallback::cancelTimer()
{
m_delay = s_decade;
m_timer.startOneShot(s_decade);
}
MonotonicTime GCActivityCallback::nextFireTime()
{
return MonotonicTime::now() + m_timer.secondsUntilFire();
}
#endif
void GCActivityCallback::didAllocate(size_t bytes)
{
// The first byte allocated in an allocation cycle will report 0 bytes to didAllocate.
// We pretend it's one byte so that we don't ignore this allocation entirely.
if (!bytes)
bytes = 1;
double bytesExpectedToReclaim = static_cast<double>(bytes) * deathRate();
Seconds newDelay = lastGCLength() / gcTimeSlice(bytesExpectedToReclaim);
scheduleTimer(newDelay);
}
void GCActivityCallback::willCollect()
{
cancelTimer();
}
void GCActivityCallback::cancel()
{
cancelTimer();
}
}
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