| /* |
| * Copyright (C) 2013-2021 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" |
| #include <wtf/FixedVector.h> |
| |
| namespace JSC { |
| |
| class JSPropertyNameEnumerator; |
| class LLIntOffsetsExtractor; |
| class Structure; |
| class StructureChain; |
| class CachedSpecialPropertyAdaptiveStructureWatchpoint; |
| class CachedSpecialPropertyAdaptiveInferredPropertyValueWatchpoint; |
| struct SpecialPropertyCache; |
| enum class CachedPropertyNamesKind : uint8_t { |
| Keys = 0, |
| GetOwnPropertyNames, |
| }; |
| static constexpr unsigned numberOfCachedPropertyNames = 2; |
| |
| enum class CachedSpecialPropertyKey : uint8_t { |
| ToStringTag = 0, |
| ToString, |
| ValueOf, |
| ToPrimitive, |
| }; |
| static constexpr unsigned numberOfCachedSpecialPropertyKeys = 4; |
| |
| class StructureRareData; |
| class StructureChainInvalidationWatchpoint; |
| |
| 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&, Structure*); |
| |
| static constexpr bool needsDestruction = true; |
| static void destroy(JSCell*); |
| |
| DECLARE_VISIT_CHILDREN; |
| |
| static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype); |
| |
| Structure* previousID() const |
| { |
| return m_previous.get(); |
| } |
| void setPreviousID(VM&, Structure*); |
| void clearPreviousID(); |
| |
| JSValue cachedSpecialProperty(CachedSpecialPropertyKey) const; |
| void cacheSpecialProperty(JSGlobalObject*, VM&, Structure* baseStructure, JSValue, CachedSpecialPropertyKey, const PropertySlot&); |
| |
| JSPropertyNameEnumerator* cachedPropertyNameEnumerator() const; |
| uintptr_t cachedPropertyNameEnumeratorAndFlag() const; |
| void setCachedPropertyNameEnumerator(VM&, Structure*, JSPropertyNameEnumerator*, StructureChain*); |
| void clearCachedPropertyNameEnumerator(); |
| |
| JSImmutableButterfly* cachedPropertyNames(CachedPropertyNamesKind) const; |
| JSImmutableButterfly* cachedPropertyNamesIgnoringSentinel(CachedPropertyNamesKind) const; |
| JSImmutableButterfly* cachedPropertyNamesConcurrently(CachedPropertyNamesKind) const; |
| void setCachedPropertyNames(VM&, CachedPropertyNamesKind, 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* cachedPropertyNamesSentinel() { return bitwise_cast<JSImmutableButterfly*>(static_cast<uintptr_t>(1)); } |
| |
| static ptrdiff_t offsetOfCachedPropertyNames(CachedPropertyNamesKind kind) |
| { |
| return OBJECT_OFFSETOF(StructureRareData, m_cachedPropertyNames) + sizeof(WriteBarrier<JSImmutableButterfly>) * static_cast<unsigned>(kind); |
| } |
| |
| static ptrdiff_t offsetOfCachedPropertyNameEnumeratorAndFlag() |
| { |
| return OBJECT_OFFSETOF(StructureRareData, m_cachedPropertyNameEnumeratorAndFlag); |
| } |
| |
| DECLARE_EXPORT_INFO; |
| |
| void finalizeUnconditionally(VM&); |
| |
| static constexpr uintptr_t cachedPropertyNameEnumeratorIsValidatedViaTraversingFlag = 1; |
| static constexpr uintptr_t cachedPropertyNameEnumeratorMask = ~static_cast<uintptr_t>(1); |
| |
| private: |
| friend class LLIntOffsetsExtractor; |
| friend class Structure; |
| friend class CachedSpecialPropertyAdaptiveStructureWatchpoint; |
| friend class CachedSpecialPropertyAdaptiveInferredPropertyValueWatchpoint; |
| |
| StructureRareData(VM&, Structure*); |
| |
| void clearCachedSpecialProperty(CachedSpecialPropertyKey); |
| void cacheSpecialPropertySlow(JSGlobalObject*, VM&, Structure* baseStructure, JSValue, CachedSpecialPropertyKey, const PropertySlot&); |
| |
| SpecialPropertyCache& ensureSpecialPropertyCache(); |
| SpecialPropertyCache& ensureSpecialPropertyCacheSlow(); |
| bool canCacheSpecialProperty(CachedSpecialPropertyKey); |
| void giveUpOnSpecialPropertyCache(CachedSpecialPropertyKey); |
| |
| bool tryCachePropertyNameEnumeratorViaWatchpoint(VM&, Structure*, StructureChain*); |
| |
| WriteBarrier<Structure> m_previous; |
| // FIXME: We should have some story for clearing these property names caches in GC. |
| // https://bugs.webkit.org/show_bug.cgi?id=192659 |
| uintptr_t m_cachedPropertyNameEnumeratorAndFlag { 0 }; |
| FixedVector<StructureChainInvalidationWatchpoint> m_cachedPropertyNameEnumeratorWatchpoints; |
| WriteBarrier<JSImmutableButterfly> m_cachedPropertyNames[numberOfCachedPropertyNames] { }; |
| |
| typedef HashMap<PropertyOffset, RefPtr<WatchpointSet>, WTF::IntHash<PropertyOffset>, WTF::UnsignedWithZeroKeyHashTraits<PropertyOffset>> PropertyWatchpointMap; |
| #ifdef NDEBUG |
| static_assert(sizeof(PropertyWatchpointMap) == sizeof(void*), "StructureRareData should remain small"); |
| #endif |
| |
| PropertyWatchpointMap m_replacementWatchpointSets; |
| std::unique_ptr<SpecialPropertyCache> m_specialPropertyCache; |
| Box<InlineWatchpointSet> m_polyProtoWatchpoint; |
| |
| PropertyOffset m_maxOffset; |
| PropertyOffset m_transitionOffset; |
| }; |
| |
| } // namespace JSC |