/*
- * Copyright (C) 2008, 2009, 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009, 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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 COMPUTER, INC. ``AS IS'' AND ANY
+ * 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 COMPUTER, INC. OR
+ * 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
#include "Structure.h"
#include "CodeBlock.h"
+#include "DumpContext.h"
+#include "JSCInlines.h"
#include "JSObject.h"
-#include "JSPropertyNameIterator.h"
+#include "JSPropertyNameEnumerator.h"
#include "Lookup.h"
+#include "PropertyMapHashTable.h"
#include "PropertyNameArray.h"
#include "StructureChain.h"
#include "StructureRareDataInlines.h"
+#include "WeakGCMapInlines.h"
+#include <wtf/CommaPrinter.h>
+#include <wtf/ProcessID.h>
#include <wtf/RefCountedLeakCounter.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
using namespace std;
using namespace WTF;
-#if DUMP_PROPERTYMAP_STATS
-
-int numProbes;
-int numCollisions;
-int numRehashes;
-int numRemoves;
-
-#endif
-
namespace JSC {
#if DUMP_STRUCTURE_ID_STATISTICS
static HashSet<Structure*>& liveStructureSet = *(new HashSet<Structure*>);
#endif
-bool StructureTransitionTable::contains(StringImpl* rep, unsigned attributes) const
+bool StructureTransitionTable::contains(UniquedStringImpl* rep, unsigned attributes) const
{
if (isUsingSingleSlot()) {
Structure* transition = singleTransition();
- return transition && transition->m_nameInPrevious == rep && transition->m_attributesInPrevious == attributes;
+ return transition && transition->m_nameInPrevious == rep && transition->attributesInPrevious() == attributes;
}
- return map()->get(make_pair(rep, attributes));
+ return map()->get(std::make_pair(rep, attributes));
}
-inline Structure* StructureTransitionTable::get(StringImpl* rep, unsigned attributes) const
+Structure* StructureTransitionTable::get(UniquedStringImpl* rep, unsigned attributes) const
{
if (isUsingSingleSlot()) {
Structure* transition = singleTransition();
- return (transition && transition->m_nameInPrevious == rep && transition->m_attributesInPrevious == attributes) ? transition : 0;
+ return (transition && transition->m_nameInPrevious == rep && transition->attributesInPrevious() == attributes) ? transition : 0;
}
- return map()->get(make_pair(rep, attributes));
+ return map()->get(std::make_pair(rep, attributes));
}
-inline void StructureTransitionTable::add(VM& vm, Structure* structure)
+void StructureTransitionTable::add(VM& vm, Structure* structure)
{
if (isUsingSingleSlot()) {
Structure* existingTransition = singleTransition();
// This handles the second transition being added
// (or the first transition being despecified!)
- setMap(new TransitionMap());
+ setMap(new TransitionMap(vm));
add(vm, existingTransition);
}
// Newer versions of the STL have an std::make_pair function that takes rvalue references.
// When either of the parameters are bitfields, the C++ compiler will try to bind them as lvalues, which is invalid. To work around this, use unary "+" to make the parameter an rvalue.
// See https://bugs.webkit.org/show_bug.cgi?id=59261 for more details
- map()->set(make_pair(structure->m_nameInPrevious, +structure->m_attributesInPrevious), structure);
+ map()->set(std::make_pair(structure->m_nameInPrevious.get(), +structure->attributesInPrevious()), structure);
}
void Structure::dumpStatistics()
Structure::Structure(VM& vm, JSGlobalObject* globalObject, JSValue prototype, const TypeInfo& typeInfo, const ClassInfo* classInfo, IndexingType indexingType, unsigned inlineCapacity)
: JSCell(vm, vm.structureStructure.get())
+ , m_blob(vm.heap.structureIDTable().allocateID(this), indexingType, typeInfo)
+ , m_outOfLineTypeFlags(typeInfo.outOfLineTypeFlags())
, m_globalObject(vm, this, globalObject, WriteBarrier<JSGlobalObject>::MayBeNull)
, m_prototype(vm, this, prototype)
, m_classInfo(classInfo)
- , m_transitionWatchpointSet(InitializedWatching)
+ , m_transitionWatchpointSet(IsWatched)
, m_offset(invalidOffset)
- , m_typeInfo(typeInfo)
- , m_indexingType(indexingType)
, m_inlineCapacity(inlineCapacity)
- , m_dictionaryKind(NoneDictionaryKind)
- , m_isPinnedPropertyTable(false)
- , m_hasGetterSetterProperties(false)
- , m_hasReadOnlyOrGetterSetterPropertiesExcludingProto(false)
- , m_hasNonEnumerableProperties(false)
- , m_attributesInPrevious(0)
- , m_specificFunctionThrashCount(0)
- , m_preventExtensions(false)
- , m_didTransition(false)
- , m_staticFunctionReified(false)
+ , m_bitField(0)
{
+ setDictionaryKind(NoneDictionaryKind);
+ setIsPinnedPropertyTable(false);
+ setHasGetterSetterProperties(classInfo->hasStaticSetterOrReadonlyProperties());
+ setHasCustomGetterSetterProperties(false);
+ setHasReadOnlyOrGetterSetterPropertiesExcludingProto(classInfo->hasStaticSetterOrReadonlyProperties());
+ setHasNonEnumerableProperties(false);
+ setAttributesInPrevious(0);
+ setPreventExtensions(false);
+ setDidTransition(false);
+ setStaticFunctionsReified(false);
+ setHasRareData(false);
+
ASSERT(inlineCapacity <= JSFinalObject::maxInlineCapacity());
ASSERT(static_cast<PropertyOffset>(inlineCapacity) < firstOutOfLineOffset);
- ASSERT(!typeInfo.structureHasRareData());
+ ASSERT(!hasRareData());
+ ASSERT(hasReadOnlyOrGetterSetterPropertiesExcludingProto() || !m_classInfo->hasStaticSetterOrReadonlyProperties());
+ ASSERT(hasGetterSetterProperties() || !m_classInfo->hasStaticSetterOrReadonlyProperties());
}
-const ClassInfo Structure::s_info = { "Structure", 0, 0, 0, CREATE_METHOD_TABLE(Structure) };
+const ClassInfo Structure::s_info = { "Structure", 0, 0, CREATE_METHOD_TABLE(Structure) };
Structure::Structure(VM& vm)
: JSCell(CreatingEarlyCell)
, m_prototype(vm, this, jsNull())
- , m_classInfo(&s_info)
- , m_transitionWatchpointSet(InitializedWatching)
+ , m_classInfo(info())
+ , m_transitionWatchpointSet(IsWatched)
, m_offset(invalidOffset)
- , m_typeInfo(CompoundType, OverridesVisitChildren)
- , m_indexingType(0)
, m_inlineCapacity(0)
- , m_dictionaryKind(NoneDictionaryKind)
- , m_isPinnedPropertyTable(false)
- , m_hasGetterSetterProperties(false)
- , m_hasReadOnlyOrGetterSetterPropertiesExcludingProto(false)
- , m_hasNonEnumerableProperties(false)
- , m_attributesInPrevious(0)
- , m_specificFunctionThrashCount(0)
- , m_preventExtensions(false)
- , m_didTransition(false)
- , m_staticFunctionReified(false)
+ , m_bitField(0)
{
+ setDictionaryKind(NoneDictionaryKind);
+ setIsPinnedPropertyTable(false);
+ setHasGetterSetterProperties(m_classInfo->hasStaticSetterOrReadonlyProperties());
+ setHasCustomGetterSetterProperties(false);
+ setHasReadOnlyOrGetterSetterPropertiesExcludingProto(m_classInfo->hasStaticSetterOrReadonlyProperties());
+ setHasNonEnumerableProperties(false);
+ setAttributesInPrevious(0);
+ setPreventExtensions(false);
+ setDidTransition(false);
+ setStaticFunctionsReified(false);
+ setHasRareData(false);
+
+ TypeInfo typeInfo = TypeInfo(CellType, StructureFlags);
+ m_blob = StructureIDBlob(vm.heap.structureIDTable().allocateID(this), 0, typeInfo);
+ m_outOfLineTypeFlags = typeInfo.outOfLineTypeFlags();
+
+ ASSERT(hasReadOnlyOrGetterSetterPropertiesExcludingProto() || !m_classInfo->hasStaticSetterOrReadonlyProperties());
+ ASSERT(hasGetterSetterProperties() || !m_classInfo->hasStaticSetterOrReadonlyProperties());
}
-Structure::Structure(VM& vm, const Structure* previous)
+Structure::Structure(VM& vm, Structure* previous)
: JSCell(vm, vm.structureStructure.get())
, m_prototype(vm, this, previous->storedPrototype())
, m_classInfo(previous->m_classInfo)
- , m_transitionWatchpointSet(InitializedWatching)
+ , m_transitionWatchpointSet(IsWatched)
, m_offset(invalidOffset)
- , m_typeInfo(previous->typeInfo().type(), previous->typeInfo().flags() & ~StructureHasRareData)
- , m_indexingType(previous->indexingTypeIncludingHistory())
, m_inlineCapacity(previous->m_inlineCapacity)
- , m_dictionaryKind(previous->m_dictionaryKind)
- , m_isPinnedPropertyTable(false)
- , m_hasGetterSetterProperties(previous->m_hasGetterSetterProperties)
- , m_hasReadOnlyOrGetterSetterPropertiesExcludingProto(previous->m_hasReadOnlyOrGetterSetterPropertiesExcludingProto)
- , m_hasNonEnumerableProperties(previous->m_hasNonEnumerableProperties)
- , m_attributesInPrevious(0)
- , m_specificFunctionThrashCount(previous->m_specificFunctionThrashCount)
- , m_preventExtensions(previous->m_preventExtensions)
- , m_didTransition(true)
- , m_staticFunctionReified(previous->m_staticFunctionReified)
-{
- if (previous->typeInfo().structureHasRareData() && previous->rareData()->needsCloning())
- cloneRareDataFrom(vm, previous);
- else if (previous->previousID())
- m_previousOrRareData.set(vm, this, previous->previousID());
-
- previous->notifyTransitionFromThisStructure();
+ , m_bitField(0)
+{
+ setDictionaryKind(previous->dictionaryKind());
+ setIsPinnedPropertyTable(previous->hasBeenFlattenedBefore());
+ setHasGetterSetterProperties(previous->hasGetterSetterProperties());
+ setHasCustomGetterSetterProperties(previous->hasCustomGetterSetterProperties());
+ setHasReadOnlyOrGetterSetterPropertiesExcludingProto(previous->hasReadOnlyOrGetterSetterPropertiesExcludingProto());
+ setHasNonEnumerableProperties(previous->hasNonEnumerableProperties());
+ setAttributesInPrevious(0);
+ setPreventExtensions(previous->preventExtensions());
+ setDidTransition(true);
+ setStaticFunctionsReified(previous->staticFunctionsReified());
+ setHasRareData(false);
+
+ TypeInfo typeInfo = previous->typeInfo();
+ m_blob = StructureIDBlob(vm.heap.structureIDTable().allocateID(this), previous->indexingTypeIncludingHistory(), typeInfo);
+ m_outOfLineTypeFlags = typeInfo.outOfLineTypeFlags();
+
+ ASSERT(!previous->typeInfo().structureIsImmortal());
+ setPreviousID(vm, previous);
+
+ previous->didTransitionFromThisStructure();
if (previous->m_globalObject)
m_globalObject.set(vm, this, previous->m_globalObject.get());
+ ASSERT(hasReadOnlyOrGetterSetterPropertiesExcludingProto() || !m_classInfo->hasStaticSetterOrReadonlyProperties());
+ ASSERT(hasGetterSetterProperties() || !m_classInfo->hasStaticSetterOrReadonlyProperties());
+}
+
+Structure::~Structure()
+{
+ if (typeInfo().structureIsImmortal())
+ return;
+ Heap::heap(this)->structureIDTable().deallocateID(this, m_blob.structureID());
}
void Structure::destroy(JSCell* cell)
static_cast<Structure*>(cell)->Structure::~Structure();
}
-void Structure::materializePropertyMap(VM& vm)
+void Structure::findStructuresAndMapForMaterialization(Vector<Structure*, 8>& structures, Structure*& structure, PropertyTable*& table)
{
- ASSERT(structure()->classInfo() == &s_info);
- ASSERT(!propertyTable());
-
- Vector<Structure*, 8> structures;
- structures.append(this);
-
- Structure* structure = this;
-
- // Search for the last Structure with a property table.
- while ((structure = structure->previousID())) {
- if (structure->m_isPinnedPropertyTable) {
- ASSERT(structure->propertyTable());
- ASSERT(!structure->previousID());
+ ASSERT(structures.isEmpty());
+ table = 0;
- propertyTable().set(vm, this, structure->propertyTable()->copy(vm, 0, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity)));
- break;
+ for (structure = this; structure; structure = structure->previousID()) {
+ structure->m_lock.lock();
+
+ table = structure->propertyTable().get();
+ if (table) {
+ // Leave the structure locked, so that the caller can do things to it atomically
+ // before it loses its property table.
+ return;
}
-
+
structures.append(structure);
+ structure->m_lock.unlock();
}
+
+ ASSERT(!structure);
+ ASSERT(!table);
+}
- if (!propertyTable())
- createPropertyMap(vm, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity));
+void Structure::materializePropertyMap(VM& vm)
+{
+ ASSERT(structure()->classInfo() == info());
+ ASSERT(!propertyTable());
- for (ptrdiff_t i = structures.size() - 1; i >= 0; --i) {
+ Vector<Structure*, 8> structures;
+ Structure* structure;
+ PropertyTable* table;
+
+ findStructuresAndMapForMaterialization(structures, structure, table);
+
+ if (table) {
+ table = table->copy(vm, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity));
+ structure->m_lock.unlock();
+ }
+
+ // Must hold the lock on this structure, since we will be modifying this structure's
+ // property map. We don't want getConcurrently() to see the property map in a half-baked
+ // state.
+ GCSafeConcurrentJITLocker locker(m_lock, vm.heap);
+ if (!table)
+ createPropertyMap(locker, vm, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity));
+ else
+ propertyTable().set(vm, this, table);
+
+ for (size_t i = structures.size(); i--;) {
structure = structures[i];
if (!structure->m_nameInPrevious)
continue;
- PropertyMapEntry entry(vm, this, structure->m_nameInPrevious.get(), structure->m_offset, structure->m_attributesInPrevious, structure->m_specificValueInPrevious.get());
+ PropertyMapEntry entry(structure->m_nameInPrevious.get(), structure->m_offset, structure->attributesInPrevious());
propertyTable()->add(entry, m_offset, PropertyTable::PropertyOffsetMustNotChange);
}
checkOffsetConsistency();
}
-inline size_t nextOutOfLineStorageCapacity(size_t currentCapacity)
-{
- if (!currentCapacity)
- return initialOutOfLineCapacity;
- return currentCapacity * outOfLineGrowthFactor;
-}
-
-size_t Structure::suggestedNewOutOfLineStorageCapacity()
-{
- return nextOutOfLineStorageCapacity(outOfLineCapacity());
-}
-
-void Structure::despecifyDictionaryFunction(VM& vm, PropertyName propertyName)
-{
- StringImpl* rep = propertyName.uid();
-
- materializePropertyMapIfNecessary(vm);
-
- ASSERT(isDictionary());
- ASSERT(propertyTable());
-
- PropertyMapEntry* entry = propertyTable()->find(rep).first;
- ASSERT(entry);
- entry->specificValue.clear();
-}
-
-Structure* Structure::addPropertyTransitionToExistingStructure(Structure* structure, PropertyName propertyName, unsigned attributes, JSCell* specificValue, PropertyOffset& offset)
+Structure* Structure::addPropertyTransitionToExistingStructureImpl(Structure* structure, UniquedStringImpl* uid, unsigned attributes, PropertyOffset& offset)
{
ASSERT(!structure->isDictionary());
ASSERT(structure->isObject());
- if (Structure* existingTransition = structure->m_transitionTable.get(propertyName.uid(), attributes)) {
- JSCell* specificValueInPrevious = existingTransition->m_specificValueInPrevious.get();
- if (specificValueInPrevious && specificValueInPrevious != specificValue)
- return 0;
+ if (Structure* existingTransition = structure->m_transitionTable.get(uid, attributes)) {
validateOffset(existingTransition->m_offset, existingTransition->inlineCapacity());
offset = existingTransition->m_offset;
return existingTransition;
return 0;
}
+Structure* Structure::addPropertyTransitionToExistingStructure(Structure* structure, PropertyName propertyName, unsigned attributes, PropertyOffset& offset)
+{
+ ASSERT(!isCompilationThread());
+ return addPropertyTransitionToExistingStructureImpl(structure, propertyName.uid(), attributes, offset);
+}
+
+Structure* Structure::addPropertyTransitionToExistingStructureConcurrently(Structure* structure, UniquedStringImpl* uid, unsigned attributes, PropertyOffset& offset)
+{
+ ConcurrentJITLocker locker(structure->m_lock);
+ return addPropertyTransitionToExistingStructureImpl(structure, uid, attributes, offset);
+}
+
bool Structure::anyObjectInChainMayInterceptIndexedAccesses() const
{
for (const Structure* current = this; ;) {
}
}
+bool Structure::holesMustForwardToPrototype(VM& vm) const
+{
+ if (this->mayInterceptIndexedAccesses())
+ return true;
+
+ JSValue prototype = this->storedPrototype();
+ if (!prototype.isObject())
+ return false;
+ JSObject* object = asObject(prototype);
+
+ while (true) {
+ Structure& structure = *object->structure(vm);
+ if (hasIndexedProperties(object->indexingType()) || structure.mayInterceptIndexedAccesses())
+ return true;
+ prototype = structure.storedPrototype();
+ if (!prototype.isObject())
+ return false;
+ object = asObject(prototype);
+ }
+
+ RELEASE_ASSERT_NOT_REACHED();
+ return false;
+}
+
bool Structure::needsSlowPutIndexing() const
{
return anyObjectInChainMayInterceptIndexedAccesses()
return AllocateArrayStorage;
}
-Structure* Structure::addPropertyTransition(VM& vm, Structure* structure, PropertyName propertyName, unsigned attributes, JSCell* specificValue, PropertyOffset& offset)
+Structure* Structure::addPropertyTransition(VM& vm, Structure* structure, PropertyName propertyName, unsigned attributes, PropertyOffset& offset, PutPropertySlot::Context context)
{
- // If we have a specific function, we may have got to this point if there is
- // already a transition with the correct property name and attributes, but
- // specialized to a different function. In this case we just want to give up
- // and despecialize the transition.
- // In this case we clear the value of specificFunction which will result
- // in us adding a non-specific transition, and any subsequent lookup in
- // Structure::addPropertyTransitionToExistingStructure will just use that.
- if (specificValue && structure->m_transitionTable.contains(propertyName.uid(), attributes))
- specificValue = 0;
-
ASSERT(!structure->isDictionary());
ASSERT(structure->isObject());
- ASSERT(!Structure::addPropertyTransitionToExistingStructure(structure, propertyName, attributes, specificValue, offset));
+ ASSERT(!Structure::addPropertyTransitionToExistingStructure(structure, propertyName, attributes, offset));
- if (structure->m_specificFunctionThrashCount == maxSpecificFunctionThrashCount)
- specificValue = 0;
-
- if (structure->transitionCount() > s_maxTransitionLength) {
+ int maxTransitionLength;
+ if (context == PutPropertySlot::PutById)
+ maxTransitionLength = s_maxTransitionLengthForNonEvalPutById;
+ else
+ maxTransitionLength = s_maxTransitionLength;
+ if (structure->transitionCount() > maxTransitionLength) {
Structure* transition = toCacheableDictionaryTransition(vm, structure);
ASSERT(structure != transition);
- offset = transition->putSpecificValue(vm, propertyName, attributes, specificValue);
+ offset = transition->add(vm, propertyName, attributes);
return transition;
}
Structure* transition = create(vm, structure);
transition->m_cachedPrototypeChain.setMayBeNull(vm, transition, structure->m_cachedPrototypeChain.get());
- transition->setPreviousID(vm, transition, structure);
transition->m_nameInPrevious = propertyName.uid();
- transition->m_attributesInPrevious = attributes;
- transition->m_specificValueInPrevious.setMayBeNull(vm, transition, specificValue);
- transition->propertyTable().set(vm, transition, structure->takePropertyTableOrCloneIfPinned(vm, transition));
+ transition->setAttributesInPrevious(attributes);
+ transition->propertyTable().set(vm, transition, structure->takePropertyTableOrCloneIfPinned(vm));
transition->m_offset = structure->m_offset;
- offset = transition->putSpecificValue(vm, propertyName, attributes, specificValue);
+ offset = transition->add(vm, propertyName, attributes);
checkOffset(transition->m_offset, transition->inlineCapacity());
- structure->m_transitionTable.add(vm, transition);
+ {
+ ConcurrentJITLocker locker(structure->m_lock);
+ structure->m_transitionTable.add(vm, transition);
+ }
transition->checkOffsetConsistency();
structure->checkOffsetConsistency();
return transition;
transition->m_prototype.set(vm, transition, prototype);
- structure->materializePropertyMapIfNecessary(vm);
- transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm, transition));
+ DeferGC deferGC(vm.heap);
+ structure->materializePropertyMapIfNecessary(vm, deferGC);
+ transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm));
transition->m_offset = structure->m_offset;
transition->pin();
return transition;
}
-Structure* Structure::despecifyFunctionTransition(VM& vm, Structure* structure, PropertyName replaceFunction)
-{
- ASSERT(structure->m_specificFunctionThrashCount < maxSpecificFunctionThrashCount);
- Structure* transition = create(vm, structure);
-
- ++transition->m_specificFunctionThrashCount;
-
- structure->materializePropertyMapIfNecessary(vm);
- transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm, transition));
- transition->m_offset = structure->m_offset;
- transition->pin();
-
- if (transition->m_specificFunctionThrashCount == maxSpecificFunctionThrashCount)
- transition->despecifyAllFunctions(vm);
- else {
- bool removed = transition->despecifyFunction(vm, replaceFunction);
- ASSERT_UNUSED(removed, removed);
- }
-
- transition->checkOffsetConsistency();
- return transition;
-}
-
Structure* Structure::attributeChangeTransition(VM& vm, Structure* structure, PropertyName propertyName, unsigned attributes)
{
+ DeferGC deferGC(vm.heap);
if (!structure->isUncacheableDictionary()) {
Structure* transition = create(vm, structure);
- structure->materializePropertyMapIfNecessary(vm);
- transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm, transition));
+ structure->materializePropertyMapIfNecessary(vm, deferGC);
+ transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm));
transition->m_offset = structure->m_offset;
transition->pin();
}
ASSERT(structure->propertyTable());
- PropertyMapEntry* entry = structure->propertyTable()->find(propertyName.uid()).first;
+ PropertyMapEntry* entry = structure->propertyTable()->get(propertyName.uid());
ASSERT(entry);
entry->attributes = attributes;
Structure* transition = create(vm, structure);
- structure->materializePropertyMapIfNecessary(vm);
- transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm, transition));
+ DeferGC deferGC(vm.heap);
+ structure->materializePropertyMapIfNecessary(vm, deferGC);
+ transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm));
transition->m_offset = structure->m_offset;
- transition->m_dictionaryKind = kind;
+ transition->setDictionaryKind(kind);
transition->pin();
transition->checkOffsetConsistency();
PropertyTable::iterator iter = transition->propertyTable()->begin();
PropertyTable::iterator end = transition->propertyTable()->end();
if (iter != end)
- transition->m_hasReadOnlyOrGetterSetterPropertiesExcludingProto = true;
+ transition->setHasReadOnlyOrGetterSetterPropertiesExcludingProto(true);
for (; iter != end; ++iter)
iter->attributes |= iter->attributes & Accessor ? DontDelete : (DontDelete | ReadOnly);
}
+ ASSERT(transition->hasReadOnlyOrGetterSetterPropertiesExcludingProto() || !transition->classInfo()->hasStaticSetterOrReadonlyProperties());
+ ASSERT(transition->hasGetterSetterProperties() || !transition->classInfo()->hasStaticSetterOrReadonlyProperties());
transition->checkOffsetConsistency();
return transition;
}
// Don't set m_offset, as one can not transition to this.
- structure->materializePropertyMapIfNecessary(vm);
- transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm, transition));
+ DeferGC deferGC(vm.heap);
+ structure->materializePropertyMapIfNecessary(vm, deferGC);
+ transition->propertyTable().set(vm, transition, structure->copyPropertyTableForPinning(vm));
transition->m_offset = structure->m_offset;
- transition->m_preventExtensions = true;
+ transition->setPreventExtensions(true);
transition->pin();
transition->checkOffsetConsistency();
return transition;
}
-PropertyTable* Structure::takePropertyTableOrCloneIfPinned(VM& vm, Structure* owner)
+PropertyTable* Structure::takePropertyTableOrCloneIfPinned(VM& vm)
{
- materializePropertyMapIfNecessaryForPinning(vm);
- if (m_isPinnedPropertyTable)
- return propertyTable()->copy(vm, owner, propertyTable()->size() + 1);
+ DeferGC deferGC(vm.heap);
+ materializePropertyMapIfNecessaryForPinning(vm, deferGC);
+
+ if (isPinnedPropertyTable())
+ return propertyTable()->copy(vm, propertyTable()->size() + 1);
+
+ // Hold the lock while stealing the table - so that getConcurrently() on another thread
+ // will either have to bypass this structure, or will get to use the property table
+ // before it is stolen.
+ ConcurrentJITLocker locker(m_lock);
PropertyTable* takenPropertyTable = propertyTable().get();
propertyTable().clear();
return takenPropertyTable;
if (globalObject->isOriginalArrayStructure(structure)) {
Structure* result = globalObject->originalArrayStructureForIndexingType(indexingType);
if (result->indexingTypeIncludingHistory() == indexingType) {
- structure->notifyTransitionFromThisStructure();
+ structure->didTransitionFromThisStructure();
return result;
}
}
}
- if (Structure* existingTransition = structure->m_transitionTable.get(0, attributes)) {
- ASSERT(existingTransition->m_attributesInPrevious == attributes);
+ Structure* existingTransition;
+ if (!structure->isDictionary() && (existingTransition = structure->m_transitionTable.get(0, attributes))) {
+ ASSERT(existingTransition->attributesInPrevious() == attributes);
ASSERT(existingTransition->indexingTypeIncludingHistory() == indexingType);
return existingTransition;
}
Structure* transition = create(vm, structure);
- transition->setPreviousID(vm, transition, structure);
- transition->m_attributesInPrevious = attributes;
- transition->m_indexingType = indexingType;
- transition->propertyTable().set(vm, transition, structure->takePropertyTableOrCloneIfPinned(vm, transition));
+ transition->setAttributesInPrevious(attributes);
+ transition->m_blob.setIndexingType(indexingType);
+ transition->propertyTable().set(vm, transition, structure->takePropertyTableOrCloneIfPinned(vm));
transition->m_offset = structure->m_offset;
checkOffset(transition->m_offset, transition->inlineCapacity());
- structure->m_transitionTable.add(vm, transition);
+ if (structure->isDictionary())
+ transition->pin();
+ else {
+ ConcurrentJITLocker locker(structure->m_lock);
+ structure->m_transitionTable.add(vm, transition);
+ }
transition->checkOffsetConsistency();
return transition;
}
if (isExtensible())
return false;
- materializePropertyMapIfNecessary(vm);
+ DeferGC deferGC(vm.heap);
+ materializePropertyMapIfNecessary(vm, deferGC);
if (!propertyTable())
return true;
if (isExtensible())
return false;
- materializePropertyMapIfNecessary(vm);
+ DeferGC deferGC(vm.heap);
+ materializePropertyMapIfNecessary(vm, deferGC);
if (!propertyTable())
return true;
{
checkOffsetConsistency();
ASSERT(isDictionary());
+
+ size_t beforeOutOfLineCapacity = this->outOfLineCapacity();
if (isUncacheableDictionary()) {
ASSERT(propertyTable());
checkOffsetConsistency();
}
- m_dictionaryKind = NoneDictionaryKind;
-
- // If the object had a Butterfly but after flattening/compacting we no longer have need of it,
- // we need to zero it out because the collector depends on the Structure to know the size for copying.
- if (object->butterfly() && !this->outOfLineCapacity() && !hasIndexingHeader(this->indexingType()))
- object->setButterfly(vm, 0, this);
+ setDictionaryKind(NoneDictionaryKind);
+ setHasBeenFlattenedBefore(true);
+
+ size_t afterOutOfLineCapacity = this->outOfLineCapacity();
+
+ if (beforeOutOfLineCapacity != afterOutOfLineCapacity) {
+ ASSERT(beforeOutOfLineCapacity > afterOutOfLineCapacity);
+ // If the object had a Butterfly but after flattening/compacting we no longer have need of it,
+ // we need to zero it out because the collector depends on the Structure to know the size for copying.
+ if (object->butterfly() && !afterOutOfLineCapacity && !this->hasIndexingHeader(object))
+ object->setStructureAndButterfly(vm, this, 0);
+ // If the object was down-sized to the point where the base of the Butterfly is no longer within the
+ // first CopiedBlock::blockSize bytes, we'll get the wrong answer if we try to mask the base back to
+ // the CopiedBlock header. To prevent this case we need to memmove the Butterfly down.
+ else if (object->butterfly())
+ object->shiftButterflyAfterFlattening(vm, beforeOutOfLineCapacity, afterOutOfLineCapacity);
+ }
return this;
}
-PropertyOffset Structure::addPropertyWithoutTransition(VM& vm, PropertyName propertyName, unsigned attributes, JSCell* specificValue)
+PropertyOffset Structure::addPropertyWithoutTransition(VM& vm, PropertyName propertyName, unsigned attributes)
{
- ASSERT(!enumerationCache());
-
- if (m_specificFunctionThrashCount == maxSpecificFunctionThrashCount)
- specificValue = 0;
-
- materializePropertyMapIfNecessaryForPinning(vm);
+ DeferGC deferGC(vm.heap);
+ materializePropertyMapIfNecessaryForPinning(vm, deferGC);
pin();
- return putSpecificValue(vm, propertyName, attributes, specificValue);
+ return add(vm, propertyName, attributes);
}
PropertyOffset Structure::removePropertyWithoutTransition(VM& vm, PropertyName propertyName)
{
ASSERT(isUncacheableDictionary());
- ASSERT(!enumerationCache());
- materializePropertyMapIfNecessaryForPinning(vm);
+ DeferGC deferGC(vm.heap);
+ materializePropertyMapIfNecessaryForPinning(vm, deferGC);
pin();
return remove(propertyName);
void Structure::pin()
{
ASSERT(propertyTable());
- m_isPinnedPropertyTable = true;
+ setIsPinnedPropertyTable(true);
clearPreviousID();
- m_nameInPrevious.clear();
+ m_nameInPrevious = nullptr;
}
void Structure::allocateRareData(VM& vm)
{
- ASSERT(!typeInfo().structureHasRareData());
+ ASSERT(!hasRareData());
StructureRareData* rareData = StructureRareData::create(vm, previous());
- m_typeInfo = TypeInfo(typeInfo().type(), typeInfo().flags() | StructureHasRareData);
+ WTF::storeStoreFence();
m_previousOrRareData.set(vm, this, rareData);
+ WTF::storeStoreFence();
+ setHasRareData(true);
+ ASSERT(hasRareData());
}
-void Structure::cloneRareDataFrom(VM& vm, const Structure* other)
+WatchpointSet* Structure::ensurePropertyReplacementWatchpointSet(VM& vm, PropertyOffset offset)
{
- ASSERT(other->typeInfo().structureHasRareData());
- StructureRareData* newRareData = StructureRareData::clone(vm, other->rareData());
- m_typeInfo = TypeInfo(typeInfo().type(), typeInfo().flags() | StructureHasRareData);
- m_previousOrRareData.set(vm, this, newRareData);
+ ASSERT(!isUncacheableDictionary());
+
+ if (!hasRareData())
+ allocateRareData(vm);
+ ConcurrentJITLocker locker(m_lock);
+ StructureRareData* rareData = this->rareData();
+ if (!rareData->m_replacementWatchpointSets) {
+ rareData->m_replacementWatchpointSets =
+ std::make_unique<StructureRareData::PropertyWatchpointMap>();
+ WTF::storeStoreFence();
+ }
+ auto result = rareData->m_replacementWatchpointSets->add(offset, nullptr);
+ if (result.isNewEntry)
+ result.iterator->value = adoptRef(new WatchpointSet(IsWatched));
+ return result.iterator->value.get();
+}
+
+void Structure::startWatchingPropertyForReplacements(VM& vm, PropertyName propertyName)
+{
+ ASSERT(!isUncacheableDictionary());
+
+ PropertyOffset offset = get(vm, propertyName);
+ if (!JSC::isValidOffset(offset))
+ return;
+
+ startWatchingPropertyForReplacements(vm, offset);
+}
+
+void Structure::didCachePropertyReplacement(VM& vm, PropertyOffset offset)
+{
+ ensurePropertyReplacementWatchpointSet(vm, offset)->fireAll("Did cache property replacement");
+}
+
+void Structure::startWatchingInternalProperties(VM& vm)
+{
+ if (!isUncacheableDictionary()) {
+ startWatchingPropertyForReplacements(vm, vm.propertyNames->toString);
+ startWatchingPropertyForReplacements(vm, vm.propertyNames->valueOf);
+ }
+ setDidWatchInternalProperties(true);
}
#if DUMP_PROPERTYMAP_STATS
+PropertyMapHashTableStats* propertyMapHashTableStats = 0;
+
struct PropertyMapStatisticsExitLogger {
+ PropertyMapStatisticsExitLogger();
~PropertyMapStatisticsExitLogger();
};
-static PropertyMapStatisticsExitLogger logger;
+DEFINE_GLOBAL_FOR_LOGGING(PropertyMapStatisticsExitLogger, logger, );
-PropertyMapStatisticsExitLogger::~PropertyMapStatisticsExitLogger()
+PropertyMapStatisticsExitLogger::PropertyMapStatisticsExitLogger()
{
- dataLogF("\nJSC::PropertyMap statistics\n\n");
- dataLogF("%d probes\n", numProbes);
- dataLogF("%d collisions (%.1f%%)\n", numCollisions, 100.0 * numCollisions / numProbes);
- dataLogF("%d rehashes\n", numRehashes);
- dataLogF("%d removes\n", numRemoves);
+ propertyMapHashTableStats = adoptPtr(new PropertyMapHashTableStats()).leakPtr();
}
-#endif
-
-#if !DO_PROPERTYMAP_CONSTENCY_CHECK
-
-inline void Structure::checkConsistency()
+PropertyMapStatisticsExitLogger::~PropertyMapStatisticsExitLogger()
{
- checkOffsetConsistency();
+ unsigned finds = propertyMapHashTableStats->numFinds;
+ unsigned collisions = propertyMapHashTableStats->numCollisions;
+ dataLogF("\nJSC::PropertyMap statistics for process %d\n\n", getCurrentProcessID());
+ dataLogF("%d finds\n", finds);
+ dataLogF("%d collisions (%.1f%%)\n", collisions, 100.0 * collisions / finds);
+ dataLogF("%d lookups\n", propertyMapHashTableStats->numLookups.load());
+ dataLogF("%d lookup probings\n", propertyMapHashTableStats->numLookupProbing.load());
+ dataLogF("%d adds\n", propertyMapHashTableStats->numAdds.load());
+ dataLogF("%d removes\n", propertyMapHashTableStats->numRemoves.load());
+ dataLogF("%d rehashes\n", propertyMapHashTableStats->numRehashes.load());
+ dataLogF("%d reinserts\n", propertyMapHashTableStats->numReinserts.load());
}
#endif
-PropertyTable* Structure::copyPropertyTable(VM& vm, Structure* owner)
+PropertyTable* Structure::copyPropertyTable(VM& vm)
{
if (!propertyTable())
return 0;
- return PropertyTable::clone(vm, owner, *propertyTable().get());
+ return PropertyTable::clone(vm, *propertyTable().get());
}
-PropertyTable* Structure::copyPropertyTableForPinning(VM& vm, Structure* owner)
+PropertyTable* Structure::copyPropertyTableForPinning(VM& vm)
{
if (propertyTable())
- return PropertyTable::clone(vm, owner, *propertyTable().get());
+ return PropertyTable::clone(vm, *propertyTable().get());
return PropertyTable::create(vm, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity));
}
-PropertyOffset Structure::get(VM& vm, PropertyName propertyName, unsigned& attributes, JSCell*& specificValue)
+PropertyOffset Structure::getConcurrently(UniquedStringImpl* uid, unsigned& attributes)
{
- ASSERT(structure()->classInfo() == &s_info);
-
- materializePropertyMapIfNecessary(vm);
- if (!propertyTable())
- return invalidOffset;
-
- PropertyMapEntry* entry = propertyTable()->find(propertyName.uid()).first;
- if (!entry)
- return invalidOffset;
-
- attributes = entry->attributes;
- specificValue = entry->specificValue.get();
- return entry->offset;
-}
-
-bool Structure::despecifyFunction(VM& vm, PropertyName propertyName)
-{
- materializePropertyMapIfNecessary(vm);
- if (!propertyTable())
- return false;
-
- PropertyMapEntry* entry = propertyTable()->find(propertyName.uid()).first;
- if (!entry)
- return false;
-
- ASSERT(entry->specificValue);
- entry->specificValue.clear();
- return true;
+ PropertyOffset result = invalidOffset;
+
+ forEachPropertyConcurrently(
+ [&] (const PropertyMapEntry& candidate) -> bool {
+ if (candidate.key != uid)
+ return true;
+
+ result = candidate.offset;
+ attributes = candidate.attributes;
+ return false;
+ });
+
+ return result;
}
-void Structure::despecifyAllFunctions(VM& vm)
+Vector<PropertyMapEntry> Structure::getPropertiesConcurrently()
{
- materializePropertyMapIfNecessary(vm);
- if (!propertyTable())
- return;
+ Vector<PropertyMapEntry> result;
- PropertyTable::iterator end = propertyTable()->end();
- for (PropertyTable::iterator iter = propertyTable()->begin(); iter != end; ++iter)
- iter->specificValue.clear();
+ forEachPropertyConcurrently(
+ [&] (const PropertyMapEntry& entry) -> bool {
+ result.append(entry);
+ return true;
+ });
+
+ return result;
}
-PropertyOffset Structure::putSpecificValue(VM& vm, PropertyName propertyName, unsigned attributes, JSCell* specificValue)
+PropertyOffset Structure::add(VM& vm, PropertyName propertyName, unsigned attributes)
{
+ GCSafeConcurrentJITLocker locker(m_lock, vm.heap);
+
ASSERT(!JSC::isValidOffset(get(vm, propertyName)));
checkConsistency();
if (attributes & DontEnum)
- m_hasNonEnumerableProperties = true;
+ setHasNonEnumerableProperties(true);
- StringImpl* rep = propertyName.uid();
+ auto rep = propertyName.uid();
if (!propertyTable())
- createPropertyMap(vm);
+ createPropertyMap(locker, vm);
PropertyOffset newOffset = propertyTable()->nextOffset(m_inlineCapacity);
- propertyTable()->add(PropertyMapEntry(vm, this, rep, newOffset, attributes, specificValue), m_offset, PropertyTable::PropertyOffsetMayChange);
+ propertyTable()->add(PropertyMapEntry(rep, newOffset, attributes), m_offset, PropertyTable::PropertyOffsetMayChange);
checkConsistency();
return newOffset;
PropertyOffset Structure::remove(PropertyName propertyName)
{
+ ConcurrentJITLocker locker(m_lock);
+
checkConsistency();
- StringImpl* rep = propertyName.uid();
+ auto rep = propertyName.uid();
if (!propertyTable())
return invalidOffset;
return offset;
}
-void Structure::createPropertyMap(VM& vm, unsigned capacity)
+void Structure::createPropertyMap(const GCSafeConcurrentJITLocker&, VM& vm, unsigned capacity)
{
ASSERT(!propertyTable());
void Structure::getPropertyNamesFromStructure(VM& vm, PropertyNameArray& propertyNames, EnumerationMode mode)
{
- materializePropertyMapIfNecessary(vm);
+ DeferGC deferGC(vm.heap);
+ materializePropertyMapIfNecessary(vm, deferGC);
if (!propertyTable())
return;
- bool knownUnique = !propertyNames.size();
+ bool knownUnique = propertyNames.canAddKnownUniqueForStructure();
PropertyTable::iterator end = propertyTable()->end();
for (PropertyTable::iterator iter = propertyTable()->begin(); iter != end; ++iter) {
- ASSERT(m_hasNonEnumerableProperties || !(iter->attributes & DontEnum));
- if (iter->key->isIdentifier() && (!(iter->attributes & DontEnum) || mode == IncludeDontEnumProperties)) {
+ ASSERT(hasNonEnumerableProperties() || !(iter->attributes & DontEnum));
+ if (!(iter->attributes & DontEnum) || mode.includeDontEnumProperties()) {
+ if (iter->key->isSymbol() && !mode.includeSymbolProperties())
+ continue;
if (knownUnique)
propertyNames.addKnownUnique(iter->key);
else
}
}
+namespace {
+
+class StructureFireDetail : public FireDetail {
+public:
+ StructureFireDetail(const Structure* structure)
+ : m_structure(structure)
+ {
+ }
+
+ virtual void dump(PrintStream& out) const override
+ {
+ out.print("Structure transition from ", *m_structure);
+ }
+
+private:
+ const Structure* m_structure;
+};
+
+} // anonymous namespace
+
+void Structure::didTransitionFromThisStructure() const
+{
+ m_transitionWatchpointSet.fireAll(StructureFireDetail(this));
+}
+
JSValue Structure::prototypeForLookup(CodeBlock* codeBlock) const
{
return prototypeForLookup(codeBlock->globalObject());
void Structure::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
Structure* thisObject = jsCast<Structure*>(cell);
- ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
- ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+ ASSERT_GC_OBJECT_INHERITS(thisObject, info());
JSCell::visitChildren(thisObject, visitor);
visitor.append(&thisObject->m_globalObject);
visitor.append(&thisObject->m_cachedPrototypeChain);
}
visitor.append(&thisObject->m_previousOrRareData);
- visitor.append(&thisObject->m_specificValueInPrevious);
- if (thisObject->m_isPinnedPropertyTable) {
+ if (thisObject->isPinnedPropertyTable()) {
ASSERT(thisObject->m_propertyTableUnsafe);
visitor.append(&thisObject->m_propertyTableUnsafe);
} else if (thisObject->m_propertyTableUnsafe)
bool Structure::prototypeChainMayInterceptStoreTo(VM& vm, PropertyName propertyName)
{
- unsigned i = propertyName.asIndex();
- if (i != PropertyName::NotAnIndex)
+ if (parseIndex(propertyName))
return anyObjectInChainMayInterceptIndexedAccesses();
for (Structure* current = this; ;) {
if (prototype.isNull())
return false;
- current = prototype.asCell()->structure();
+ current = prototype.asCell()->structure(vm);
unsigned attributes;
- JSCell* specificValue;
- PropertyOffset offset = current->get(vm, propertyName, attributes, specificValue);
+ PropertyOffset offset = current->get(vm, propertyName, attributes);
if (!JSC::isValidOffset(offset))
continue;
}
}
+PassRefPtr<StructureShape> Structure::toStructureShape(JSValue value)
+{
+ RefPtr<StructureShape> baseShape = StructureShape::create();
+ RefPtr<StructureShape> curShape = baseShape;
+ Structure* curStructure = this;
+ JSValue curValue = value;
+ while (curStructure) {
+ Vector<Structure*, 8> structures;
+ Structure* structure;
+ PropertyTable* table;
+
+ curStructure->findStructuresAndMapForMaterialization(structures, structure, table);
+ if (table) {
+ PropertyTable::iterator iter = table->begin();
+ PropertyTable::iterator end = table->end();
+ for (; iter != end; ++iter)
+ curShape->addProperty(*iter->key);
+
+ structure->m_lock.unlock();
+ }
+ for (unsigned i = structures.size(); i--;) {
+ Structure* structure = structures[i];
+ if (structure->m_nameInPrevious)
+ curShape->addProperty(*structure->m_nameInPrevious);
+ }
+
+ if (JSObject* curObject = curValue.getObject())
+ curShape->setConstructorName(JSObject::calculatedClassName(curObject));
+ else
+ curShape->setConstructorName(curStructure->classInfo()->className);
+
+ if (curStructure->isDictionary())
+ curShape->enterDictionaryMode();
+
+ curShape->markAsFinal();
+
+ if (curStructure->storedPrototypeStructure()) {
+ RefPtr<StructureShape> newShape = StructureShape::create();
+ curShape->setProto(newShape);
+ curShape = newShape.release();
+ curValue = curStructure->storedPrototype();
+ }
+
+ curStructure = curStructure->storedPrototypeStructure();
+ }
+
+ return baseShape.release();
+}
+
+bool Structure::canUseForAllocationsOf(Structure* other)
+{
+ return inlineCapacity() == other->inlineCapacity()
+ && storedPrototype() == other->storedPrototype()
+ && objectInitializationBlob() == other->objectInitializationBlob();
+}
+
+void Structure::dump(PrintStream& out) const
+{
+ out.print(RawPointer(this), ":[", classInfo()->className, ", {");
+
+ CommaPrinter comma;
+
+ const_cast<Structure*>(this)->forEachPropertyConcurrently(
+ [&] (const PropertyMapEntry& entry) -> bool {
+ out.print(comma, entry.key, ":", static_cast<int>(entry.offset));
+ return true;
+ });
+
+ out.print("}, ", IndexingTypeDump(indexingType()));
+
+ if (m_prototype.get().isCell())
+ out.print(", Proto:", RawPointer(m_prototype.get().asCell()));
+
+ out.print("]");
+}
+
+void Structure::dumpInContext(PrintStream& out, DumpContext* context) const
+{
+ if (context)
+ context->structures.dumpBrief(this, out);
+ else
+ dump(out);
+}
+
+void Structure::dumpBrief(PrintStream& out, const CString& string) const
+{
+ out.print("%", string, ":", classInfo()->className);
+}
+
+void Structure::dumpContextHeader(PrintStream& out)
+{
+ out.print("Structures:");
+}
+
#if DO_PROPERTYMAP_CONSTENCY_CHECK
void PropertyTable::checkConsistency()
{
- checkOffsetConsistency();
ASSERT(m_indexSize >= PropertyTable::MinimumTableSize);
ASSERT(m_indexMask);
ASSERT(m_indexSize == m_indexMask + 1);
if (rep == PROPERTY_MAP_DELETED_ENTRY_KEY)
continue;
++nonEmptyEntryCount;
- unsigned i = rep->existingHash();
+ unsigned i = IdentifierRepHash::hash(rep);
unsigned k = 0;
unsigned entryIndex;
while (1) {
if (rep == table()[entryIndex - 1].key)
break;
if (k == 0)
- k = 1 | doubleHash(rep->existingHash());
+ k = 1 | doubleHash(IdentifierRepHash::hash(rep));
i += k;
}
ASSERT(entryIndex == c + 1);
void Structure::checkConsistency()
{
+ checkOffsetConsistency();
+
if (!propertyTable())
return;
- if (!m_hasNonEnumerableProperties) {
+ if (!hasNonEnumerableProperties()) {
PropertyTable::iterator end = propertyTable()->end();
for (PropertyTable::iterator iter = propertyTable()->begin(); iter != end; ++iter) {
ASSERT(!(iter->attributes & DontEnum));
propertyTable()->checkConsistency();
}
+#else
+
+inline void Structure::checkConsistency()
+{
+ checkOffsetConsistency();
+}
+
#endif // DO_PROPERTYMAP_CONSTENCY_CHECK
+bool ClassInfo::hasStaticSetterOrReadonlyProperties() const
+{
+ for (const ClassInfo* ci = this; ci; ci = ci->parentClass) {
+ if (const HashTable* table = ci->staticPropHashTable) {
+ if (table->hasSetterOrReadonlyProperties)
+ return true;
+ }
+ }
+ return false;
+}
+
+void Structure::setCachedPropertyNameEnumerator(VM& vm, JSPropertyNameEnumerator* enumerator)
+{
+ ASSERT(!isDictionary());
+ if (!hasRareData())
+ allocateRareData(vm);
+ rareData()->setCachedPropertyNameEnumerator(vm, enumerator);
+}
+
+JSPropertyNameEnumerator* Structure::cachedPropertyNameEnumerator() const
+{
+ if (!hasRareData())
+ return nullptr;
+ return rareData()->cachedPropertyNameEnumerator();
+}
+
+bool Structure::canCachePropertyNameEnumerator() const
+{
+ if (isDictionary())
+ return false;
+
+ if (hasIndexedProperties(indexingType()))
+ return false;
+
+ if (typeInfo().overridesGetPropertyNames())
+ return false;
+
+ StructureChain* structureChain = m_cachedPrototypeChain.get();
+ ASSERT(structureChain);
+ WriteBarrier<Structure>* structure = structureChain->head();
+ while (true) {
+ if (!structure->get())
+ break;
+ if (structure->get()->typeInfo().overridesGetPropertyNames())
+ return false;
+ structure++;
+ }
+
+ return true;
+}
+
+bool Structure::canAccessPropertiesQuickly() const
+{
+ if (hasNonEnumerableProperties())
+ return false;
+ if (hasGetterSetterProperties())
+ return false;
+ if (isUncacheableDictionary())
+ return false;
+ return true;
+}
+
} // namespace JSC
projects / apple / javascriptcore.git / blobdiff