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/*
* Copyright (C) 2013-2019 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. ``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
* 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 "IndexingType.h"
#include "JSTypeInfo.h"
#include "PrototypeKey.h"
#include "WeakGCMap.h"
#include <wtf/Lock.h>
#include <wtf/TriState.h>
namespace JSC {
class FunctionExecutable;
class JSGlobalObject;
class JSObject;
class Structure;
class VM;
// Tracks the canonical structure an object should be allocated with when inheriting from a given prototype.
class StructureCache {
public:
explicit StructureCache(VM& vm)
: m_structures(vm)
{
}
JS_EXPORT_PRIVATE void clear();
JS_EXPORT_PRIVATE Structure* emptyObjectStructureForPrototype(JSGlobalObject*, JSObject*, unsigned inlineCapacity, bool makePolyProtoStructure = false, FunctionExecutable* = nullptr);
JS_EXPORT_PRIVATE Structure* emptyStructureForPrototypeFromBaseStructure(JSGlobalObject*, JSObject*, Structure*);
JS_EXPORT_PRIVATE Structure* emptyObjectStructureConcurrently(JSGlobalObject*, JSObject* prototype, unsigned inlineCapacity);
private:
Structure* createEmptyStructure(JSGlobalObject*, JSObject* prototype, const TypeInfo&, const ClassInfo*, IndexingType, unsigned inlineCapacity, bool makePolyProtoStructure, FunctionExecutable*);
using StructureMap = WeakGCMap<PrototypeKey, Structure>;
StructureMap m_structures;
Lock m_lock;
};
} // namespace JSC
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