#ifndef Structure_h
#define Structure_h
#include "ClassInfo.h"
#include "Identifier.h"
#include "JSCell.h"
#include "JSType.h"
#include "JSValue.h"
#include "PropertyMapHashTable.h"
#include "PropertyNameArray.h"
#include "Protect.h"
#include "StructureTransitionTable.h"
#include "JSTypeInfo.h"
#include "UString.h"
#include "Weak.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace JSC {
class LLIntOffsetsExtractor;
class PropertyNameArray;
class PropertyNameArrayData;
class StructureChain;
class SlotVisitor;
class JSString;
class Structure : public JSCell {
public:
friend class StructureTransitionTable;
typedef JSCell Base;
static Structure* create(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype, const TypeInfo& typeInfo, const ClassInfo* classInfo)
{
ASSERT(globalData.structureStructure);
ASSERT(classInfo);
Structure* structure = new (NotNull, allocateCell<Structure>(globalData.heap)) Structure(globalData, globalObject, prototype, typeInfo, classInfo);
structure->finishCreation(globalData);
return structure;
}
protected:
void finishCreation(JSGlobalData& globalData)
{
Base::finishCreation(globalData);
ASSERT(m_prototype);
ASSERT(m_prototype.isObject() || m_prototype.isNull());
}
void finishCreation(JSGlobalData& globalData, CreatingEarlyCellTag)
{
Base::finishCreation(globalData, this, CreatingEarlyCell);
ASSERT(m_prototype);
ASSERT(m_prototype.isNull());
ASSERT(!globalData.structureStructure);
}
public:
static void dumpStatistics();
JS_EXPORT_PRIVATE static Structure* addPropertyTransition(JSGlobalData&, Structure*, const Identifier& propertyName, unsigned attributes, JSCell* specificValue, size_t& offset);
JS_EXPORT_PRIVATE static Structure* addPropertyTransitionToExistingStructure(Structure*, const Identifier& propertyName, unsigned attributes, JSCell* specificValue, size_t& offset);
static Structure* removePropertyTransition(JSGlobalData&, Structure*, const Identifier& propertyName, size_t& offset);
JS_EXPORT_PRIVATE static Structure* changePrototypeTransition(JSGlobalData&, Structure*, JSValue prototype);
JS_EXPORT_PRIVATE static Structure* despecifyFunctionTransition(JSGlobalData&, Structure*, const Identifier&);
static Structure* attributeChangeTransition(JSGlobalData&, Structure*, const Identifier& propertyName, unsigned attributes);
static Structure* toCacheableDictionaryTransition(JSGlobalData&, Structure*);
static Structure* toUncacheableDictionaryTransition(JSGlobalData&, Structure*);
static Structure* sealTransition(JSGlobalData&, Structure*);
static Structure* freezeTransition(JSGlobalData&, Structure*);
static Structure* preventExtensionsTransition(JSGlobalData&, Structure*);
bool isSealed(JSGlobalData&);
bool isFrozen(JSGlobalData&);
bool isExtensible() const { return !m_preventExtensions; }
bool didTransition() const { return m_didTransition; }
bool shouldGrowPropertyStorage() { return propertyStorageCapacity() == propertyStorageSize(); }
JS_EXPORT_PRIVATE size_t suggestedNewPropertyStorageSize();
Structure* flattenDictionaryStructure(JSGlobalData&, JSObject*);
static void destroy(JSCell*);
JS_EXPORT_PRIVATE size_t addPropertyWithoutTransition(JSGlobalData&, const Identifier& propertyName, unsigned attributes, JSCell* specificValue);
size_t removePropertyWithoutTransition(JSGlobalData&, const Identifier& propertyName);
void setPrototypeWithoutTransition(JSGlobalData& globalData, JSValue prototype) { m_prototype.set(globalData, this, prototype); }
bool isDictionary() const { return m_dictionaryKind != NoneDictionaryKind; }
bool isUncacheableDictionary() const { return m_dictionaryKind == UncachedDictionaryKind; }
const TypeInfo& typeInfo() const { ASSERT(structure()->classInfo() == &s_info); return m_typeInfo; }
bool isObject() const { return typeInfo().isObject(); }
JSGlobalObject* globalObject() const { return m_globalObject.get(); }
void setGlobalObject(JSGlobalData& globalData, JSGlobalObject* globalObject) { m_globalObject.set(globalData, this, globalObject); }
JSValue storedPrototype() const { return m_prototype.get(); }
JSValue prototypeForLookup(ExecState*) const;
StructureChain* prototypeChain(ExecState*) const;
static void visitChildren(JSCell*, SlotVisitor&);
Structure* previousID() const { ASSERT(structure()->classInfo() == &s_info); return m_previous.get(); }
bool transitivelyTransitionedFrom(Structure* structureToFind);
void growPropertyStorageCapacity();
unsigned propertyStorageCapacity() const { ASSERT(structure()->classInfo() == &s_info); return m_propertyStorageCapacity; }
unsigned propertyStorageSize() const { ASSERT(structure()->classInfo() == &s_info); return (m_propertyTable ? m_propertyTable->propertyStorageSize() : static_cast<unsigned>(m_offset + 1)); }
bool isUsingInlineStorage() const;
size_t get(JSGlobalData&, const Identifier& propertyName);
size_t get(JSGlobalData&, const UString& name);
JS_EXPORT_PRIVATE size_t get(JSGlobalData&, StringImpl* propertyName, unsigned& attributes, JSCell*& specificValue);
size_t get(JSGlobalData& globalData, const Identifier& propertyName, unsigned& attributes, JSCell*& specificValue)
{
ASSERT(!propertyName.isNull());
ASSERT(structure()->classInfo() == &s_info);
return get(globalData, propertyName.impl(), attributes, specificValue);
}
bool hasGetterSetterProperties() const { return m_hasGetterSetterProperties; }
bool hasReadOnlyOrGetterSetterPropertiesExcludingProto() const { return m_hasReadOnlyOrGetterSetterPropertiesExcludingProto; }
void setHasGetterSetterProperties(bool is__proto__)
{
m_hasGetterSetterProperties = true;
if (!is__proto__)
m_hasReadOnlyOrGetterSetterPropertiesExcludingProto = true;
}
void setContainsReadOnlyProperties()
{
m_hasReadOnlyOrGetterSetterPropertiesExcludingProto = true;
}
bool hasNonEnumerableProperties() const { return m_hasNonEnumerableProperties; }
bool isEmpty() const { return m_propertyTable ? m_propertyTable->isEmpty() : m_offset == noOffset; }
JS_EXPORT_PRIVATE void despecifyDictionaryFunction(JSGlobalData&, const Identifier& propertyName);
void disableSpecificFunctionTracking() { m_specificFunctionThrashCount = maxSpecificFunctionThrashCount; }
void setEnumerationCache(JSGlobalData&, JSPropertyNameIterator* enumerationCache); JSPropertyNameIterator* enumerationCache(); void getPropertyNamesFromStructure(JSGlobalData&, PropertyNameArray&, EnumerationMode);
JSString* objectToStringValue() { return m_objectToStringValue.get(); }
void setObjectToStringValue(JSGlobalData& globalData, const JSCell* owner, JSString* value)
{
m_objectToStringValue.set(globalData, owner, value);
}
bool staticFunctionsReified()
{
return m_staticFunctionReified;
}
void setStaticFunctionsReified()
{
m_staticFunctionReified = true;
}
const ClassInfo* classInfo() const { return m_classInfo; }
static ptrdiff_t prototypeOffset()
{
return OBJECT_OFFSETOF(Structure, m_prototype);
}
static ptrdiff_t typeInfoFlagsOffset()
{
return OBJECT_OFFSETOF(Structure, m_typeInfo) + TypeInfo::flagsOffset();
}
static ptrdiff_t typeInfoTypeOffset()
{
return OBJECT_OFFSETOF(Structure, m_typeInfo) + TypeInfo::typeOffset();
}
static Structure* createStructure(JSGlobalData& globalData)
{
ASSERT(!globalData.structureStructure);
Structure* structure = new (NotNull, allocateCell<Structure>(globalData.heap)) Structure(globalData);
structure->finishCreation(globalData, CreatingEarlyCell);
return structure;
}
static JS_EXPORTDATA const ClassInfo s_info;
private:
friend class LLIntOffsetsExtractor;
JS_EXPORT_PRIVATE Structure(JSGlobalData&, JSGlobalObject*, JSValue prototype, const TypeInfo&, const ClassInfo*);
Structure(JSGlobalData&);
Structure(JSGlobalData&, const Structure*);
static Structure* create(JSGlobalData& globalData, const Structure* structure)
{
ASSERT(globalData.structureStructure);
Structure* newStructure = new (NotNull, allocateCell<Structure>(globalData.heap)) Structure(globalData, structure);
newStructure->finishCreation(globalData);
return newStructure;
}
typedef enum {
NoneDictionaryKind = 0,
CachedDictionaryKind = 1,
UncachedDictionaryKind = 2
} DictionaryKind;
static Structure* toDictionaryTransition(JSGlobalData&, Structure*, DictionaryKind);
size_t putSpecificValue(JSGlobalData&, const Identifier& propertyName, unsigned attributes, JSCell* specificValue);
size_t remove(const Identifier& propertyName);
void createPropertyMap(unsigned keyCount = 0);
void checkConsistency();
bool despecifyFunction(JSGlobalData&, const Identifier&);
void despecifyAllFunctions(JSGlobalData&);
PassOwnPtr<PropertyTable> copyPropertyTable(JSGlobalData&, Structure* owner);
PassOwnPtr<PropertyTable> copyPropertyTableForPinning(JSGlobalData&, Structure* owner);
JS_EXPORT_PRIVATE void materializePropertyMap(JSGlobalData&);
void materializePropertyMapIfNecessary(JSGlobalData& globalData)
{
ASSERT(structure()->classInfo() == &s_info);
if (!m_propertyTable && m_previous)
materializePropertyMap(globalData);
}
void materializePropertyMapIfNecessaryForPinning(JSGlobalData& globalData)
{
ASSERT(structure()->classInfo() == &s_info);
if (!m_propertyTable)
materializePropertyMap(globalData);
}
int transitionCount() const
{
return m_offset == noOffset ? 0 : m_offset + 1;
}
bool isValid(ExecState*, StructureChain* cachedPrototypeChain) const;
void pin();
static const int s_maxTransitionLength = 64;
static const int noOffset = -1;
static const unsigned maxSpecificFunctionThrashCount = 3;
TypeInfo m_typeInfo;
WriteBarrier<JSGlobalObject> m_globalObject;
WriteBarrier<Unknown> m_prototype;
mutable WriteBarrier<StructureChain> m_cachedPrototypeChain;
WriteBarrier<Structure> m_previous;
RefPtr<StringImpl> m_nameInPrevious;
WriteBarrier<JSCell> m_specificValueInPrevious;
const ClassInfo* m_classInfo;
StructureTransitionTable m_transitionTable;
WriteBarrier<JSPropertyNameIterator> m_enumerationCache;
OwnPtr<PropertyTable> m_propertyTable;
uint32_t m_propertyStorageCapacity;
WriteBarrier<JSString> m_objectToStringValue;
int m_offset;
unsigned m_dictionaryKind : 2;
bool m_isPinnedPropertyTable : 1;
bool m_hasGetterSetterProperties : 1;
bool m_hasReadOnlyOrGetterSetterPropertiesExcludingProto : 1;
bool m_hasNonEnumerableProperties : 1;
unsigned m_attributesInPrevious : 7;
unsigned m_specificFunctionThrashCount : 2;
unsigned m_preventExtensions : 1;
unsigned m_didTransition : 1;
unsigned m_staticFunctionReified;
};
inline size_t Structure::get(JSGlobalData& globalData, const Identifier& propertyName)
{
ASSERT(structure()->classInfo() == &s_info);
materializePropertyMapIfNecessary(globalData);
if (!m_propertyTable)
return notFound;
PropertyMapEntry* entry = m_propertyTable->find(propertyName.impl()).first;
return entry ? entry->offset : notFound;
}
inline size_t Structure::get(JSGlobalData& globalData, const UString& name)
{
ASSERT(structure()->classInfo() == &s_info);
materializePropertyMapIfNecessary(globalData);
if (!m_propertyTable)
return notFound;
PropertyMapEntry* entry = m_propertyTable->findWithString(name.impl()).first;
return entry ? entry->offset : notFound;
}
inline bool JSCell::isObject() const
{
return m_structure->isObject();
}
inline bool JSCell::isString() const
{
return m_structure->typeInfo().type() == StringType;
}
inline bool JSCell::isGetterSetter() const
{
return m_structure->typeInfo().type() == GetterSetterType;
}
inline bool JSCell::isAPIValueWrapper() const
{
return m_structure->typeInfo().type() == APIValueWrapperType;
}
inline void JSCell::setStructure(JSGlobalData& globalData, Structure* structure)
{
ASSERT(structure->typeInfo().overridesVisitChildren() == this->structure()->typeInfo().overridesVisitChildren());
ASSERT(structure->classInfo() == m_structure->classInfo());
m_structure.set(globalData, this, structure);
}
inline const ClassInfo* JSCell::validatedClassInfo() const
{
#if ENABLE(GC_VALIDATION)
ASSERT(m_structure.unvalidatedGet()->classInfo() == m_classInfo);
#else
ASSERT(m_structure->classInfo() == m_classInfo);
#endif
return m_classInfo;
}
ALWAYS_INLINE void MarkStack::internalAppend(JSCell* cell)
{
ASSERT(!m_isCheckingForDefaultMarkViolation);
if (!cell)
return;
#if ENABLE(GC_VALIDATION)
validate(cell);
#endif
m_visitCount++;
if (Heap::testAndSetMarked(cell) || !cell->structure())
return;
ASSERT(!cell->isZapped());
m_stack.append(cell);
}
inline StructureTransitionTable::Hash::Key StructureTransitionTable::keyForWeakGCMapFinalizer(void*, Structure* structure)
{
return Hash::Key(structure->m_nameInPrevious.get(), +structure->m_attributesInPrevious);
}
inline bool Structure::transitivelyTransitionedFrom(Structure* structureToFind)
{
for (Structure* current = this; current; current = current->previousID()) {
if (current == structureToFind)
return true;
}
return false;
}
inline JSCell::JSCell(JSGlobalData& globalData, Structure* structure)
: m_classInfo(structure->classInfo())
, m_structure(globalData, this, structure)
{
}
inline void JSCell::finishCreation(JSGlobalData& globalData, Structure* structure, CreatingEarlyCellTag)
{
#if ENABLE(GC_VALIDATION)
ASSERT(globalData.isInitializingObject());
globalData.setInitializingObjectClass(0);
if (structure)
#endif
m_structure.setEarlyValue(globalData, this, structure);
m_classInfo = structure->classInfo();
ASSERT(m_structure || !globalData.structureStructure);
}
}
#endif // Structure_h