mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
/*
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* Copyright (C) 2010-2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "GCActivityCallback.h"
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#include "HeapInlines.h"
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#include "VM.h"
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namespace JSC {
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bool GCActivityCallback::s_shouldCreateGCTimer = true;
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const double timerSlop = 2.0; // Fudge factor to avoid performance cost of resetting timer.
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GCActivityCallback::GCActivityCallback(Heap* heap)
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: GCActivityCallback(heap->vm())
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{
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}
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void GCActivityCallback::doWork(VM& vm)
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{
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if (!isEnabled())
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return;
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ASSERT(vm.currentThreadIsHoldingAPILock());
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Heap& heap = vm.heap;
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if (heap.isDeferred()) {
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scheduleTimer(0_s);
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return;
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}
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doCollection(vm);
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}
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void GCActivityCallback::scheduleTimer(Seconds newDelay)
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{
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if (newDelay * timerSlop > m_delay)
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return;
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Seconds delta = m_delay - newDelay;
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m_delay = newDelay;
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if (auto timeUntilFire = this->timeUntilFire())
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setTimeUntilFire(*timeUntilFire - delta);
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else
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setTimeUntilFire(newDelay);
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}
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void GCActivityCallback::didAllocate(Heap& heap, size_t bytes)
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{
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// The first byte allocated in an allocation cycle will report 0 bytes to didAllocate.
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// We pretend it's one byte so that we don't ignore this allocation entirely.
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if (!bytes)
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bytes = 1;
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double bytesExpectedToReclaim = static_cast<double>(bytes) * deathRate(heap);
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Seconds newDelay = lastGCLength(heap) / gcTimeSlice(bytesExpectedToReclaim);
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scheduleTimer(newDelay);
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}
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void GCActivityCallback::willCollect()
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{
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cancel();
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}
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void GCActivityCallback::cancel()
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{
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m_delay = s_decade;
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cancelTimer();
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}
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}
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