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/*
* Copyright (C) 2010 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 "GCHandle.h"
namespace JSC {
WeakGCHandlePool* WeakGCHandle::pool()
{
uintptr_t pool = (reinterpret_cast<uintptr_t>(this) & WeakGCHandlePool::poolMask);
return reinterpret_cast<WeakGCHandlePool*>(pool);
}
WeakGCHandlePool::WeakGCHandlePool()
{
ASSERT(sizeof(WeakGCHandlePool) <= WeakGCHandlePool::poolSize);
m_entriesSize = 0;
m_initialAlloc = 1;
m_entries[0].setNextInFreeList(0);
}
WeakGCHandle* WeakGCHandlePool::allocate(JSCell* cell)
{
ASSERT(cell);
ASSERT(m_entries[0].isNext());
unsigned freeList = m_entries[0].getNextInFreeList();
ASSERT(freeList < WeakGCHandlePool::numPoolEntries);
ASSERT(m_entriesSize < WeakGCHandlePool::numPoolEntries);
if (m_entriesSize == WeakGCHandlePool::numPoolEntries - 1)
return 0;
if (freeList) {
unsigned i = freeList;
freeList = m_entries[i].getNextInFreeList();
m_entries[i].set(cell);
m_entries[0].setNextInFreeList(freeList);
++m_entriesSize;
return &m_entries[i];
}
ASSERT(m_initialAlloc < WeakGCHandlePool::numPoolEntries);
unsigned i = m_initialAlloc;
++m_initialAlloc;
m_entries[i].set(cell);
++m_entriesSize;
return &m_entries[i];
}
void WeakGCHandlePool::free(WeakGCHandle* handle)
{
ASSERT(handle->pool() == this);
ASSERT(m_entries[0].isNext());
unsigned freeList = m_entries[0].getNextInFreeList();
ASSERT(freeList < WeakGCHandlePool::numPoolEntries);
handle->setNextInFreeList(freeList);
m_entries[0].setNextInFreeList(handle - m_entries);
--m_entriesSize;
}
}
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