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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 "JSImmutableButterfly.h"
#include "JSPropertyNameEnumerator.h"
#include "JSString.h"
#include "StructureRareData.h"
namespace JSC {
// FIXME: Use ObjectPropertyConditionSet instead.
// https://bugs.webkit.org/show_bug.cgi?id=216112
struct SpecialPropertyCacheEntry {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
~SpecialPropertyCacheEntry();
Bag<CachedSpecialPropertyAdaptiveStructureWatchpoint> m_missWatchpoints;
std::unique_ptr<CachedSpecialPropertyAdaptiveInferredPropertyValueWatchpoint> m_equivalenceWatchpoint;
WriteBarrier<Unknown> m_value;
};
struct SpecialPropertyCache {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
SpecialPropertyCacheEntry m_cache[numberOfCachedSpecialPropertyKeys];
};
inline void StructureRareData::setPreviousID(VM& vm, Structure* structure)
{
m_previous.set(vm, this, structure);
}
inline void StructureRareData::clearPreviousID()
{
m_previous.clear();
}
inline JSValue StructureRareData::cachedSpecialProperty(CachedSpecialPropertyKey key) const
{
auto* cache = m_specialPropertyCache.get();
if (!cache)
return JSValue();
JSValue value = cache->m_cache[static_cast<unsigned>(key)].m_value.get();
if (value == JSCell::seenMultipleCalleeObjects())
return JSValue();
#if ASSERT_ENABLED
if (value && value.isCell())
validateCell(value.asCell());
#endif
return value;
}
inline JSPropertyNameEnumerator* StructureRareData::cachedPropertyNameEnumerator() const
{
return m_cachedPropertyNameEnumerator.get();
}
inline void StructureRareData::setCachedPropertyNameEnumerator(VM& vm, JSPropertyNameEnumerator* enumerator)
{
m_cachedPropertyNameEnumerator.set(vm, this, enumerator);
}
inline JSImmutableButterfly* StructureRareData::cachedPropertyNames(CachedPropertyNamesKind kind) const
{
ASSERT(!isCompilationThread());
auto* butterfly = m_cachedPropertyNames[static_cast<unsigned>(kind)].unvalidatedGet();
if (butterfly == cachedPropertyNamesSentinel())
return nullptr;
return butterfly;
}
inline JSImmutableButterfly* StructureRareData::cachedPropertyNamesIgnoringSentinel(CachedPropertyNamesKind kind) const
{
ASSERT(!isCompilationThread());
return m_cachedPropertyNames[static_cast<unsigned>(kind)].unvalidatedGet();
}
inline JSImmutableButterfly* StructureRareData::cachedPropertyNamesConcurrently(CachedPropertyNamesKind kind) const
{
auto* butterfly = m_cachedPropertyNames[static_cast<unsigned>(kind)].unvalidatedGet();
if (butterfly == cachedPropertyNamesSentinel())
return nullptr;
return butterfly;
}
inline void StructureRareData::setCachedPropertyNames(VM& vm, CachedPropertyNamesKind kind, JSImmutableButterfly* butterfly)
{
if (butterfly == cachedPropertyNamesSentinel()) {
m_cachedPropertyNames[static_cast<unsigned>(kind)].setWithoutWriteBarrier(butterfly);
return;
}
WTF::storeStoreFence();
m_cachedPropertyNames[static_cast<unsigned>(kind)].set(vm, this, butterfly);
}
inline bool StructureRareData::canCacheSpecialProperty(CachedSpecialPropertyKey key)
{
ASSERT(!isCompilationThread() && !Thread::mayBeGCThread());
auto* cache = m_specialPropertyCache.get();
if (!cache)
return true;
return cache->m_cache[static_cast<unsigned>(key)].m_value.get() != JSCell::seenMultipleCalleeObjects();
}
inline SpecialPropertyCache& StructureRareData::ensureSpecialPropertyCache()
{
ASSERT(!isCompilationThread() && !Thread::mayBeGCThread());
if (auto* cache = m_specialPropertyCache.get())
return *cache;
return ensureSpecialPropertyCacheSlow();
}
inline void StructureRareData::cacheSpecialProperty(JSGlobalObject* globalObject, VM& vm, Structure* ownStructure, JSValue value, CachedSpecialPropertyKey key, const PropertySlot& slot)
{
if (!canCacheSpecialProperty(key))
return;
return cacheSpecialPropertySlow(globalObject, vm, ownStructure, value, key, slot);
}
} // namespace JSC
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