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Viewing changes to Source/JavaScriptCore/heap/WeakSet.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/JavaScriptCore/heap/WeakSet.cpp
 
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/*
 
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 * Copyright (C) 2012 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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 * 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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 *
 
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 
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 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 
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 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 
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 * THE POSSIBILITY OF SUCH DAMAGE.
 
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 */
 
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#include "config.h"
 
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#include "WeakSet.h"
 
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#include "Heap.h"
 
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#include "JSGlobalData.h"
 
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namespace JSC {
 
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WeakSet::~WeakSet()
 
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{
 
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    WeakBlock* next = 0;
 
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    for (WeakBlock* block = m_blocks.head(); block; block = next) {
 
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        next = block->next();
 
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        heap()->blockAllocator().deallocate(WeakBlock::destroy(block));
 
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    }
 
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    m_blocks.clear();
 
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}
 
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void WeakSet::sweep()
 
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{
 
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    for (WeakBlock* block = m_blocks.head(); block; block = block->next())
 
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        block->sweep();
 
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    resetAllocator();
 
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}
 
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WeakBlock::FreeCell* WeakSet::findAllocator()
 
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{
 
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    if (WeakBlock::FreeCell* allocator = tryFindAllocator())
 
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        return allocator;
 
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    return addAllocator();
 
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}
 
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WeakBlock::FreeCell* WeakSet::tryFindAllocator()
 
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{
 
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    while (m_nextAllocator) {
 
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        WeakBlock* block = m_nextAllocator;
 
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        m_nextAllocator = m_nextAllocator->next();
 
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        WeakBlock::SweepResult sweepResult = block->takeSweepResult();
 
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        if (sweepResult.freeList)
 
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            return sweepResult.freeList;
 
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    }
 
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    return 0;
 
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}
 
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WeakBlock::FreeCell* WeakSet::addAllocator()
 
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{
 
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    WeakBlock* block = WeakBlock::create(heap()->blockAllocator().allocate<WeakBlock>());
 
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    heap()->didAllocate(WeakBlock::blockSize);
 
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    m_blocks.append(block);
 
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    WeakBlock::SweepResult sweepResult = block->takeSweepResult();
 
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    ASSERT(!sweepResult.isNull() && sweepResult.freeList);
 
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    return sweepResult.freeList;
 
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}
 
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void WeakSet::removeAllocator(WeakBlock* block)
 
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{
 
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    m_blocks.remove(block);
 
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    WeakBlock::destroy(block);
 
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}
 
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} // namespace JSC