/*
- * Copyright (C) 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
#include "JSType.h"
#include "JSValue.h"
#include "PropertyMapHashTable.h"
+#include "PropertyNameArray.h"
+#include "Protect.h"
#include "StructureChain.h"
#include "StructureTransitionTable.h"
-#include "TypeInfo.h"
+#include "JSTypeInfo.h"
#include "UString.h"
+#include "WeakGCPtr.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace JSC {
+ class MarkStack;
class PropertyNameArray;
class PropertyNameArrayData;
+ enum EnumerationMode {
+ ExcludeDontEnumProperties,
+ IncludeDontEnumProperties
+ };
+
class Structure : public RefCounted<Structure> {
public:
friend class JIT;
- static PassRefPtr<Structure> create(JSValuePtr prototype, const TypeInfo& typeInfo)
+ friend class StructureTransitionTable;
+ static PassRefPtr<Structure> create(JSValue prototype, const TypeInfo& typeInfo, unsigned anonymousSlotCount)
{
- return adoptRef(new Structure(prototype, typeInfo));
+ return adoptRef(new Structure(prototype, typeInfo, anonymousSlotCount));
}
static void startIgnoringLeaks();
static void dumpStatistics();
- static PassRefPtr<Structure> addPropertyTransition(Structure*, const Identifier& propertyName, unsigned attributes, size_t& offset);
- static PassRefPtr<Structure> addPropertyTransitionToExistingStructure(Structure*, const Identifier& propertyName, unsigned attributes, size_t& offset);
+ static PassRefPtr<Structure> addPropertyTransition(Structure*, const Identifier& propertyName, unsigned attributes, JSCell* specificValue, size_t& offset);
+ static PassRefPtr<Structure> addPropertyTransitionToExistingStructure(Structure*, const Identifier& propertyName, unsigned attributes, JSCell* specificValue, size_t& offset);
static PassRefPtr<Structure> removePropertyTransition(Structure*, const Identifier& propertyName, size_t& offset);
- static PassRefPtr<Structure> changePrototypeTransition(Structure*, JSValuePtr prototype);
+ static PassRefPtr<Structure> changePrototypeTransition(Structure*, JSValue prototype);
+ static PassRefPtr<Structure> despecifyFunctionTransition(Structure*, const Identifier&);
static PassRefPtr<Structure> getterSetterTransition(Structure*);
- static PassRefPtr<Structure> toDictionaryTransition(Structure*);
- static PassRefPtr<Structure> fromDictionaryTransition(Structure*);
+ static PassRefPtr<Structure> toCacheableDictionaryTransition(Structure*);
+ static PassRefPtr<Structure> toUncacheableDictionaryTransition(Structure*);
- ~Structure();
+ PassRefPtr<Structure> flattenDictionaryStructure(JSObject*);
- void mark()
- {
- if (!m_prototype.marked())
- m_prototype.mark();
- }
+ ~Structure();
// These should be used with caution.
- size_t addPropertyWithoutTransition(const Identifier& propertyName, unsigned attributes);
+ size_t addPropertyWithoutTransition(const Identifier& propertyName, unsigned attributes, JSCell* specificValue);
size_t removePropertyWithoutTransition(const Identifier& propertyName);
- void setPrototypeWithoutTransition(JSValuePtr prototype) { m_prototype = prototype; }
-
- bool isDictionary() const { return m_isDictionary; }
+ void setPrototypeWithoutTransition(JSValue prototype) { m_prototype = prototype; }
+
+ bool isDictionary() const { return m_dictionaryKind != NoneDictionaryKind; }
+ bool isUncacheableDictionary() const { return m_dictionaryKind == UncachedDictionaryKind; }
const TypeInfo& typeInfo() const { return m_typeInfo; }
- JSValuePtr storedPrototype() const { return m_prototype; }
- JSValuePtr prototypeForLookup(ExecState*) const;
+ JSValue storedPrototype() const { return m_prototype; }
+ JSValue prototypeForLookup(ExecState*) const;
StructureChain* prototypeChain(ExecState*) const;
Structure* previousID() const { return m_previous.get(); }
void growPropertyStorageCapacity();
- size_t propertyStorageCapacity() const { return m_propertyStorageCapacity; }
- size_t propertyStorageSize() const { return m_propertyTable ? m_propertyTable->keyCount + (m_propertyTable->deletedOffsets ? m_propertyTable->deletedOffsets->size() : 0) : m_offset + 1; }
+ unsigned propertyStorageCapacity() const { return m_propertyStorageCapacity; }
+ unsigned propertyStorageSize() const { return m_anonymousSlotCount + (m_propertyTable ? m_propertyTable->keyCount + (m_propertyTable->deletedOffsets ? m_propertyTable->deletedOffsets->size() : 0) : m_offset + 1); }
+ bool isUsingInlineStorage() const;
size_t get(const Identifier& propertyName);
- size_t get(const Identifier& propertyName, unsigned& attributes);
- void getEnumerablePropertyNames(ExecState*, PropertyNameArray&, JSObject*);
+ size_t get(const UString::Rep* rep, unsigned& attributes, JSCell*& specificValue);
+ size_t get(const Identifier& propertyName, unsigned& attributes, JSCell*& specificValue)
+ {
+ ASSERT(!propertyName.isNull());
+ return get(propertyName.ustring().rep(), attributes, specificValue);
+ }
+ bool transitionedFor(const JSCell* specificValue)
+ {
+ return m_specificValueInPrevious == specificValue;
+ }
+ bool hasTransition(UString::Rep*, unsigned attributes);
+ bool hasTransition(const Identifier& propertyName, unsigned attributes)
+ {
+ return hasTransition(propertyName._ustring.rep(), attributes);
+ }
bool hasGetterSetterProperties() const { return m_hasGetterSetterProperties; }
void setHasGetterSetterProperties(bool hasGetterSetterProperties) { m_hasGetterSetterProperties = hasGetterSetterProperties; }
+ bool hasNonEnumerableProperties() const { return m_hasNonEnumerableProperties; }
+
+ bool hasAnonymousSlots() const { return !!m_anonymousSlotCount; }
+ unsigned anonymousSlotCount() const { return m_anonymousSlotCount; }
+
bool isEmpty() const { return m_propertyTable ? !m_propertyTable->keyCount : m_offset == noOffset; }
+ void despecifyDictionaryFunction(const Identifier& propertyName);
+ void disableSpecificFunctionTracking() { m_specificFunctionThrashCount = maxSpecificFunctionThrashCount; }
+
+ void setEnumerationCache(JSPropertyNameIterator* enumerationCache); // Defined in JSPropertyNameIterator.h.
+ void clearEnumerationCache(JSPropertyNameIterator* enumerationCache); // Defined in JSPropertyNameIterator.h.
+ JSPropertyNameIterator* enumerationCache(); // Defined in JSPropertyNameIterator.h.
+ void getPropertyNames(PropertyNameArray&, EnumerationMode mode);
+
private:
- Structure(JSValuePtr prototype, const TypeInfo&);
- size_t put(const Identifier& propertyName, unsigned attributes);
+ Structure(JSValue prototype, const TypeInfo&, unsigned anonymousSlotCount);
+
+ typedef enum {
+ NoneDictionaryKind = 0,
+ CachedDictionaryKind = 1,
+ UncachedDictionaryKind = 2
+ } DictionaryKind;
+ static PassRefPtr<Structure> toDictionaryTransition(Structure*, DictionaryKind);
+
+ size_t put(const Identifier& propertyName, unsigned attributes, JSCell* specificValue);
size_t remove(const Identifier& propertyName);
- void getEnumerableNamesFromPropertyTable(PropertyNameArray&);
- void getEnumerableNamesFromClassInfoTable(ExecState*, const ClassInfo*, PropertyNameArray&);
void expandPropertyMapHashTable();
void rehashPropertyMapHashTable();
void insertIntoPropertyMapHashTable(const PropertyMapEntry&);
void checkConsistency();
+ bool despecifyFunction(const Identifier&);
+ void despecifyAllFunctions();
+
PropertyMapHashTable* copyPropertyTable();
void materializePropertyMap();
void materializePropertyMapIfNecessary()
materializePropertyMap();
}
- void clearEnumerationCache();
-
- void* addressOfCount()
- {
- return &m_refCount;
- }
-
signed char transitionCount() const
{
// Since the number of transitions is always the same as m_offset, we keep the size of Structure down by not storing both.
static const signed char noOffset = -1;
+ static const unsigned maxSpecificFunctionThrashCount = 3;
+
TypeInfo m_typeInfo;
- JSValuePtr m_prototype;
+ JSValue m_prototype;
mutable RefPtr<StructureChain> m_cachedPrototypeChain;
RefPtr<Structure> m_previous;
RefPtr<UString::Rep> m_nameInPrevious;
+ JSCell* m_specificValueInPrevious;
- union {
- Structure* singleTransition;
- StructureTransitionTable* table;
- } m_transitions;
+ StructureTransitionTable table;
- RefPtr<PropertyNameArrayData> m_cachedPropertyNameArrayData;
+ WeakGCPtr<JSPropertyNameIterator> m_enumerationCache;
PropertyMapHashTable* m_propertyTable;
- size_t m_propertyStorageCapacity;
+ uint32_t m_propertyStorageCapacity;
+
+ // m_offset does not account for anonymous slots
signed char m_offset;
- bool m_isDictionary : 1;
+ unsigned m_dictionaryKind : 2;
bool m_isPinnedPropertyTable : 1;
bool m_hasGetterSetterProperties : 1;
- bool m_usingSingleTransitionSlot : 1;
- unsigned m_attributesInPrevious : 5;
+ bool m_hasNonEnumerableProperties : 1;
+#if COMPILER(WINSCW)
+ // Workaround for Symbian WINSCW compiler that cannot resolve unsigned type of the declared
+ // bitfield, when used as argument in make_pair() function calls in structure.ccp.
+ // This bitfield optimization is insignificant for the Symbian emulator target.
+ unsigned m_attributesInPrevious;
+#else
+ unsigned m_attributesInPrevious : 7;
+#endif
+ unsigned m_specificFunctionThrashCount : 2;
+ unsigned m_anonymousSlotCount : 5;
+ // 5 free bits
};
inline size_t Structure::get(const Identifier& propertyName)
UString::Rep* rep = propertyName._ustring.rep();
- unsigned i = rep->computedHash();
+ unsigned i = rep->existingHash();
#if DUMP_PROPERTYMAP_STATS
++numProbes;
++numCollisions;
#endif
- unsigned k = 1 | WTF::doubleHash(rep->computedHash());
+ unsigned k = 1 | WTF::doubleHash(rep->existingHash());
while (1) {
i += k;
return m_propertyTable->entries()[entryIndex - 1].offset;
}
}
+
+ bool StructureTransitionTable::contains(const StructureTransitionTableHash::Key& key, JSCell* specificValue)
+ {
+ if (usingSingleTransitionSlot()) {
+ Structure* existingTransition = singleTransition();
+ return existingTransition && existingTransition->m_nameInPrevious.get() == key.first
+ && existingTransition->m_attributesInPrevious == key.second
+ && (existingTransition->m_specificValueInPrevious == specificValue || existingTransition->m_specificValueInPrevious == 0);
+ }
+ TransitionTable::iterator find = table()->find(key);
+ if (find == table()->end())
+ return false;
+
+ return find->second.first || find->second.second->transitionedFor(specificValue);
+ }
+
+ Structure* StructureTransitionTable::get(const StructureTransitionTableHash::Key& key, JSCell* specificValue) const
+ {
+ if (usingSingleTransitionSlot()) {
+ Structure* existingTransition = singleTransition();
+ if (existingTransition && existingTransition->m_nameInPrevious.get() == key.first
+ && existingTransition->m_attributesInPrevious == key.second
+ && (existingTransition->m_specificValueInPrevious == specificValue || existingTransition->m_specificValueInPrevious == 0))
+ return existingTransition;
+ return 0;
+ }
+
+ Transition transition = table()->get(key);
+ if (transition.second && transition.second->transitionedFor(specificValue))
+ return transition.second;
+ return transition.first;
+ }
+ bool StructureTransitionTable::hasTransition(const StructureTransitionTableHash::Key& key) const
+ {
+ if (usingSingleTransitionSlot()) {
+ Structure* transition = singleTransition();
+ return transition && transition->m_nameInPrevious == key.first
+ && transition->m_attributesInPrevious == key.second;
+ }
+ return table()->contains(key);
+ }
+
+ void StructureTransitionTable::reifySingleTransition()
+ {
+ ASSERT(usingSingleTransitionSlot());
+ Structure* existingTransition = singleTransition();
+ TransitionTable* transitionTable = new TransitionTable;
+ setTransitionTable(transitionTable);
+ if (existingTransition)
+ add(std::make_pair(existingTransition->m_nameInPrevious.get(), existingTransition->m_attributesInPrevious), existingTransition, existingTransition->m_specificValueInPrevious);
+ }
} // namespace JSC
#endif // Structure_h
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