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/*
* Copyright (C) 2013 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.
*/
#pragma once
#include "JSDestructibleObject.h"
#include "Structure.h"
#include <wtf/HashMap.h>
#include <wtf/MathExtras.h>
namespace JSC {
class WeakMapBase : public JSDestructibleObject {
public:
using Base = JSDestructibleObject;
void set(VM&, JSObject*, JSValue);
JSValue get(JSObject*);
bool remove(JSObject*);
bool contains(JSObject*);
void clear();
DECLARE_INFO;
using MapType = HashMap<JSObject*, WriteBarrier<Unknown>>;
MapType::const_iterator begin() const { return m_map.begin(); }
MapType::const_iterator end() const { return m_map.end(); }
unsigned size() const { return m_map.size(); }
static size_t estimatedSize(JSCell*);
static void visitChildren(JSCell*, SlotVisitor&);
protected:
WeakMapBase(VM&, Structure*);
static void destroy(JSCell*);
class DeadKeyCleaner : public UnconditionalFinalizer, public WeakReferenceHarvester {
public:
WeakMapBase* target();
private:
void visitWeakReferences(SlotVisitor&) override;
void finalizeUnconditionally() override;
unsigned m_liveKeyCount;
};
DeadKeyCleaner m_deadKeyCleaner;
MapType m_map;
};
} // namespace JSC
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