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Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	14	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	15	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	17	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	18	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	19	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	20	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	21	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	22	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	23	* THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "config.h"
	27	#include "HandleSet.h"
	28
	29	#include "HandleBlock.h"
	30	#include "HandleBlockInlines.h"
	31	#include "HeapRootVisitor.h"
	32	#include "JSObject.h"
	33	#include "JSCInlines.h"
	34	#include <wtf/DataLog.h>
	35
	36	namespace JSC {
	37
	38	HandleSet::HandleSet(VM* vm)
	39	: m_vm(vm)
	40	{
	41	grow();
	42	}
	43
	44	HandleSet::~HandleSet()
	45	{
	46	while (!m_blockList.isEmpty())
	47	m_vm->heap.blockAllocator().deallocate(HandleBlock::destroy(m_blockList.removeHead()));
	48	}
	49
	50	void HandleSet::grow()
	51	{
	52	HandleBlock* newBlock = HandleBlock::create(m_vm->heap.blockAllocator().allocate<HandleBlock>(), this);
	53	m_blockList.append(newBlock);
	54
	55	for (int i = newBlock->nodeCapacity() - 1; i >= 0; --i) {
	56	Node* node = newBlock->nodeAtIndex(i);
	57	new (NotNull, node) Node;
	58	m_freeList.push(node);
	59	}
	60	}
	61
	62	void HandleSet::visitStrongHandles(HeapRootVisitor& heapRootVisitor)
	63	{
	64	Node* end = m_strongList.end();
	65	for (Node* node = m_strongList.begin(); node != end; node = node->next()) {
	66	#if ENABLE(GC_VALIDATION)
	67	RELEASE_ASSERT(isLiveNode(node));
	68	#endif
	69	heapRootVisitor.visit(node->slot());
	70	}
	71	}
	72
	73	void HandleSet::writeBarrier(HandleSlot slot, const JSValue& value)
	74	{
	75	if (!value == !*slot && slot->isCell() == value.isCell())
	76	return;
	77
	78	Node* node = toNode(slot);
	79	#if ENABLE(GC_VALIDATION)
	80	RELEASE_ASSERT(isLiveNode(node));
	81	#endif
	82	SentinelLinkedList<Node>::remove(node);
	83	if (!value \|\| !value.isCell()) {
	84	m_immediateList.push(node);
	85	return;
	86	}
	87
	88	m_strongList.push(node);
	89	#if ENABLE(GC_VALIDATION)
	90	RELEASE_ASSERT(isLiveNode(node));
	91	#endif
	92	}
	93
	94	unsigned HandleSet::protectedGlobalObjectCount()
	95	{
	96	unsigned count = 0;
	97	Node* end = m_strongList.end();
	98	for (Node* node = m_strongList.begin(); node != end; node = node->next()) {
	99	JSValue value = *node->slot();
	100	if (value.isObject() && asObject(value.asCell())->isGlobalObject())
	101	count++;
	102	}
	103	return count;
	104	}
	105
	106	#if ENABLE(GC_VALIDATION) \|\| !ASSERT_DISABLED
	107	bool HandleSet::isLiveNode(Node* node)
	108	{
	109	if (node->prev()->next() != node)
	110	return false;
	111	if (node->next()->prev() != node)
	112	return false;
	113
	114	return true;
	115	}
	116	#endif
	117
	118	} // namespace JSC