mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/*
|
|
* Copyright (C) 2012, 2016 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. 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 INC. 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 "WeakSet.h"
|
|
|
|
#include "Heap.h"
|
|
#include "VM.h"
|
|
|
|
namespace JSC {
|
|
|
|
WeakSet::~WeakSet()
|
|
{
|
|
if (isOnList())
|
|
remove();
|
|
|
|
Heap& heap = *this->heap();
|
|
WeakBlock* next = nullptr;
|
|
for (WeakBlock* block = m_blocks.head(); block; block = next) {
|
|
next = block->next();
|
|
WeakBlock::destroy(heap, block);
|
|
}
|
|
m_blocks.clear();
|
|
}
|
|
|
|
void WeakSet::sweep()
|
|
{
|
|
for (WeakBlock* block = m_blocks.head(); block;) {
|
|
heap()->sweepNextLogicallyEmptyWeakBlock();
|
|
|
|
WeakBlock* nextBlock = block->next();
|
|
block->sweep();
|
|
if (block->isLogicallyEmptyButNotFree()) {
|
|
// If this WeakBlock is logically empty, but still has Weaks pointing into it,
|
|
// we can't destroy it just yet. Detach it from the WeakSet and hand ownership
|
|
// to the Heap so we don't pin down the entire MarkedBlock or PreciseAllocation.
|
|
m_blocks.remove(block);
|
|
heap()->addLogicallyEmptyWeakBlock(block);
|
|
block->disconnectContainer();
|
|
}
|
|
block = nextBlock;
|
|
}
|
|
|
|
resetAllocator();
|
|
}
|
|
|
|
void WeakSet::shrink()
|
|
{
|
|
WeakBlock* next;
|
|
for (WeakBlock* block = m_blocks.head(); block; block = next) {
|
|
next = block->next();
|
|
|
|
if (block->isEmpty())
|
|
removeAllocator(block);
|
|
}
|
|
|
|
resetAllocator();
|
|
|
|
if (m_blocks.isEmpty() && isOnList())
|
|
remove();
|
|
}
|
|
|
|
WeakBlock::FreeCell* WeakSet::findAllocator(CellContainer container)
|
|
{
|
|
if (WeakBlock::FreeCell* allocator = tryFindAllocator())
|
|
return allocator;
|
|
|
|
return addAllocator(container);
|
|
}
|
|
|
|
WeakBlock::FreeCell* WeakSet::tryFindAllocator()
|
|
{
|
|
while (m_nextAllocator) {
|
|
WeakBlock* block = m_nextAllocator;
|
|
m_nextAllocator = m_nextAllocator->next();
|
|
|
|
WeakBlock::SweepResult sweepResult = block->takeSweepResult();
|
|
if (sweepResult.freeList)
|
|
return sweepResult.freeList;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
WeakBlock::FreeCell* WeakSet::addAllocator(CellContainer container)
|
|
{
|
|
if (!isOnList())
|
|
heap()->objectSpace().addActiveWeakSet(this);
|
|
|
|
WeakBlock* block = WeakBlock::create(*heap(), container);
|
|
heap()->didAllocate(WeakBlock::blockSize);
|
|
m_blocks.append(block);
|
|
WeakBlock::SweepResult sweepResult = block->takeSweepResult();
|
|
ASSERT(!sweepResult.isNull() && sweepResult.freeList);
|
|
return sweepResult.freeList;
|
|
}
|
|
|
|
void WeakSet::removeAllocator(WeakBlock* block)
|
|
{
|
|
m_blocks.remove(block);
|
|
WeakBlock::destroy(*heap(), block);
|
|
}
|
|
|
|
} // namespace JSC
|