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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. 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 "ClassInfo.h"
#include "JSCast.h"
#include "JSTypeInfo.h"
#include "PropertyOffset.h"
#include "PropertySlot.h"
namespace JSC {
class JSPropertyNameEnumerator;
class Structure;
class StructureChain;
class ObjectToStringAdaptiveInferredPropertyValueWatchpoint;
class ObjectToStringAdaptiveStructureWatchpoint;
class StructureRareData final : public JSCell {
public:
typedef JSCell Base;
static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
template<typename CellType, SubspaceAccess>
static IsoSubspace* subspaceFor(VM& vm)
{
return &vm.structureRareDataSpace;
}
static StructureRareData* create(VM&, StructureChain*);
static constexpr bool needsDestruction = true;
static void destroy(JSCell*);
static void visitChildren(JSCell*, SlotVisitor&);
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
StructureChain* cachedPrototypeChain() const
{
return m_cachedPrototypeChain.get();
}
void setCachedPrototypeChain(VM&, StructureChain*);
JSString* objectToStringValue() const;
void setObjectToStringValue(JSGlobalObject*, VM&, Structure* baseStructure, JSString* value, PropertySlot toStringTagSymbolSlot);
void giveUpOnObjectToStringValueCache() { m_objectToStringValue.setWithoutWriteBarrier(objectToStringCacheGiveUpMarker()); }
bool canCacheObjectToStringValue() { return m_objectToStringValue.unvalidatedGet() == objectToStringCacheGiveUpMarker(); }
static JSString* objectToStringCacheGiveUpMarker() { return bitwise_cast<JSString*>(static_cast<uintptr_t>(1)); }
JSPropertyNameEnumerator* cachedPropertyNameEnumerator() const;
void setCachedPropertyNameEnumerator(VM&, JSPropertyNameEnumerator*);
JSImmutableButterfly* cachedOwnKeys() const;
JSImmutableButterfly* cachedOwnKeysIgnoringSentinel() const;
JSImmutableButterfly* cachedOwnKeysConcurrently() const;
void setCachedOwnKeys(VM&, JSImmutableButterfly*);
Box<InlineWatchpointSet> copySharedPolyProtoWatchpoint() const { return m_polyProtoWatchpoint; }
const Box<InlineWatchpointSet>& sharedPolyProtoWatchpoint() const { return m_polyProtoWatchpoint; }
void setSharedPolyProtoWatchpoint(Box<InlineWatchpointSet>&& sharedPolyProtoWatchpoint) { m_polyProtoWatchpoint = WTFMove(sharedPolyProtoWatchpoint); }
bool hasSharedPolyProtoWatchpoint() const { return static_cast<bool>(m_polyProtoWatchpoint); }
static JSImmutableButterfly* cachedOwnKeysSentinel() { return bitwise_cast<JSImmutableButterfly*>(static_cast<uintptr_t>(1)); }
static ptrdiff_t offsetOfCachedOwnKeys()
{
return OBJECT_OFFSETOF(StructureRareData, m_cachedOwnKeys);
}
DECLARE_EXPORT_INFO;
void finalizeUnconditionally(VM&);
private:
friend class Structure;
friend class ObjectToStringAdaptiveStructureWatchpoint;
friend class ObjectToStringAdaptiveInferredPropertyValueWatchpoint;
void clearObjectToStringValue();
StructureRareData(VM&, StructureChain*);
WriteBarrier<StructureChain> m_cachedPrototypeChain;
WriteBarrier<JSString> m_objectToStringValue;
// FIXME: We should have some story for clearing these property names caches in GC.
// https://bugs.webkit.org/show_bug.cgi?id=192659
WriteBarrier<JSPropertyNameEnumerator> m_cachedPropertyNameEnumerator;
WriteBarrier<JSImmutableButterfly> m_cachedOwnKeys;
typedef HashMap<PropertyOffset, RefPtr<WatchpointSet>, WTF::IntHash<PropertyOffset>, WTF::UnsignedWithZeroKeyHashTraits<PropertyOffset>> PropertyWatchpointMap;
std::unique_ptr<PropertyWatchpointMap> m_replacementWatchpointSets;
Bag<ObjectToStringAdaptiveStructureWatchpoint> m_objectToStringAdaptiveWatchpointSet;
std::unique_ptr<ObjectToStringAdaptiveInferredPropertyValueWatchpoint> m_objectToStringAdaptiveInferredValueWatchpoint;
Box<InlineWatchpointSet> m_polyProtoWatchpoint;
PropertyOffset m_maxOffset;
PropertyOffset m_transitionOffset;
};
} // namespace JSC