mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-14 04:40:19 +00:00
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/*
|
|
* Copyright (C) 2012-2019 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 "DeferGC.h"
|
|
#include "HeapInlines.h"
|
|
#include "MarkedBlock.h"
|
|
#include "VM.h"
|
|
|
|
namespace JSC {
|
|
|
|
static constexpr Seconds sweepTimeSlice = 10_ms;
|
|
static constexpr double sweepTimeTotal = .10;
|
|
static constexpr double sweepTimeMultiplier = 1.0 / sweepTimeTotal;
|
|
|
|
void IncrementalSweeper::scheduleTimer()
|
|
{
|
|
setTimeUntilFire(sweepTimeSlice * sweepTimeMultiplier);
|
|
}
|
|
|
|
IncrementalSweeper::IncrementalSweeper(Heap* heap)
|
|
: Base(heap->vm())
|
|
, m_currentDirectory(nullptr)
|
|
{
|
|
}
|
|
|
|
void IncrementalSweeper::doWork(VM& vm)
|
|
{
|
|
doSweep(vm, MonotonicTime::now());
|
|
}
|
|
|
|
void IncrementalSweeper::doSweep(VM& vm, MonotonicTime sweepBeginTime)
|
|
{
|
|
while (sweepNextBlock(vm)) {
|
|
Seconds elapsedTime = MonotonicTime::now() - sweepBeginTime;
|
|
if (elapsedTime < sweepTimeSlice)
|
|
continue;
|
|
|
|
scheduleTimer();
|
|
return;
|
|
}
|
|
|
|
if (m_shouldFreeFastMallocMemoryAfterSweeping) {
|
|
WTF::releaseFastMallocFreeMemory();
|
|
m_shouldFreeFastMallocMemoryAfterSweeping = false;
|
|
}
|
|
cancelTimer();
|
|
}
|
|
|
|
bool IncrementalSweeper::sweepNextBlock(VM& vm)
|
|
{
|
|
vm.heap.stopIfNecessary();
|
|
|
|
MarkedBlock::Handle* block = nullptr;
|
|
|
|
for (; m_currentDirectory; m_currentDirectory = m_currentDirectory->nextDirectory()) {
|
|
block = m_currentDirectory->findBlockToSweep();
|
|
if (block)
|
|
break;
|
|
}
|
|
|
|
if (block) {
|
|
DeferGCForAWhile deferGC(vm.heap);
|
|
block->sweep(nullptr);
|
|
vm.heap.objectSpace().freeOrShrinkBlock(block);
|
|
return true;
|
|
}
|
|
|
|
return vm.heap.sweepNextLogicallyEmptyWeakBlock();
|
|
}
|
|
|
|
void IncrementalSweeper::startSweeping(Heap& heap)
|
|
{
|
|
scheduleTimer();
|
|
m_currentDirectory = heap.objectSpace().firstDirectory();
|
|
}
|
|
|
|
void IncrementalSweeper::stopSweeping()
|
|
{
|
|
m_currentDirectory = nullptr;
|
|
cancelTimer();
|
|
}
|
|
|
|
} // namespace JSC
|