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/*
* Copyright (C) 2011 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 "HandleHeap.h"
#include "JSObject.h"
namespace JSC {
HandleHeap::HandleHeap(JSGlobalData* globalData)
: m_globalData(globalData)
, m_nextToFinalize(0)
#if !ASSERT_DISABLED
, m_handlingFinalizers(false)
#endif
{
grow();
}
void HandleHeap::grow()
{
Node* block = m_blockStack.grow();
for (int i = m_blockStack.blockLength - 1; i >= 0; --i) {
Node* node = &block[i];
new (node) Node(this);
m_freeList.push(node);
}
}
void HandleHeap::markStrongHandles(HeapRootMarker& heapRootMarker)
{
Node* end = m_strongList.end();
for (Node* node = m_strongList.begin(); node != end; node = node->next())
heapRootMarker.mark(node->slot());
}
void HandleHeap::updateAfterMark()
{
clearWeakPointers();
}
void HandleHeap::clearWeakPointers()
{
#if !ASSERT_DISABLED
m_handlingFinalizers = true;
#endif
Node* end = m_weakList.end();
for (Node* node = m_weakList.begin(); node != end;) {
Node* current = node;
node = current->next();
JSValue value = *current->slot();
if (!value || !value.isCell())
continue;
JSCell* cell = value.asCell();
ASSERT(!cell || cell->structure());
#if ENABLE(JSC_ZOMBIES)
ASSERT(!cell->isZombie());
#endif
if (Heap::isMarked(cell))
continue;
if (Finalizer* finalizer = current->finalizer()) {
m_nextToFinalize = node;
finalizer->finalize(Handle<Unknown>::wrapSlot(current->slot()), current->finalizerContext());
node = m_nextToFinalize;
m_nextToFinalize = 0;
}
if (current->isSelfDestroying()) {
ASSERT(node != current);
ASSERT(current->next() == node);
deallocate(toHandle(current));
} else if (current->next() == node) { // if current->next() != node, then current has been deallocated
SentinelLinkedList<Node>::remove(current);
*current->slot() = JSValue();
m_immediateList.push(current);
}
}
#if !ASSERT_DISABLED
m_handlingFinalizers = false;
#endif
}
void HandleHeap::writeBarrier(HandleSlot slot, const JSValue& value)
{
ASSERT(!m_handlingFinalizers);
if (slot->isCell() == value.isCell() && !value == !*slot)
return;
Node* node = toNode(slot);
SentinelLinkedList<Node>::remove(node);
if (!value.isCell() || !value) {
m_immediateList.push(node);
return;
}
if (node->isWeak())
m_weakList.push(node);
else
m_strongList.push(node);
}
unsigned HandleHeap::protectedGlobalObjectCount()
{
unsigned count = 0;
Node* end = m_strongList.end();
for (Node* node = m_strongList.begin(); node != end; node = node->next()) {
JSValue value = *node->slot();
if (value.isObject() && asObject(value.asCell())->isGlobalObject())
count++;
}
return count;
}
}
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