| /* |
| * Copyright (C) 1999-2001 Harri Porten (porten@kde.org) |
| * Copyright (C) 2001 Peter Kelly (pmk@post.com) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef JSObject_h |
| #define JSObject_h |
| |
| #include "ArgList.h" |
| #include "ClassInfo.h" |
| #include "CommonIdentifiers.h" |
| #include "Completion.h" |
| #include "CallFrame.h" |
| #include "JSCell.h" |
| #include "PropertySlot.h" |
| #include "PutPropertySlot.h" |
| #include "ScopeChain.h" |
| #include "Structure.h" |
| #include "JSGlobalData.h" |
| #include "JSString.h" |
| #include <wtf/StdLibExtras.h> |
| |
| namespace JSC { |
| |
| inline JSCell* getJSFunction(JSGlobalData& globalData, JSValue value) |
| { |
| if (value.isCell() && (value.asCell()->vptr() == globalData.jsFunctionVPtr)) |
| return value.asCell(); |
| return 0; |
| } |
| |
| class HashEntry; |
| class InternalFunction; |
| class PropertyDescriptor; |
| class PropertyNameArray; |
| class Structure; |
| struct HashTable; |
| |
| JSObject* throwTypeError(ExecState*, const UString&); |
| extern const char* StrictModeReadonlyPropertyWriteError; |
| |
| // ECMA 262-3 8.6.1 |
| // Property attributes |
| enum Attribute { |
| None = 0, |
| ReadOnly = 1 << 1, // property can be only read, not written |
| DontEnum = 1 << 2, // property doesn't appear in (for .. in ..) |
| DontDelete = 1 << 3, // property can't be deleted |
| Function = 1 << 4, // property is a function - only used by static hashtables |
| Getter = 1 << 5, // property is a getter |
| Setter = 1 << 6 // property is a setter |
| }; |
| |
| typedef WriteBarrierBase<Unknown>* PropertyStorage; |
| typedef const WriteBarrierBase<Unknown>* ConstPropertyStorage; |
| |
| class JSObject : public JSCell { |
| friend class BatchedTransitionOptimizer; |
| friend class JIT; |
| friend class JSCell; |
| friend void setUpStaticFunctionSlot(ExecState* exec, const HashEntry* entry, JSObject* thisObj, const Identifier& propertyName, PropertySlot& slot); |
| |
| public: |
| virtual void visitChildren(SlotVisitor&); |
| ALWAYS_INLINE void visitChildrenDirect(SlotVisitor&); |
| |
| // The inline virtual destructor cannot be the first virtual function declared |
| // in the class as it results in the vtable being generated as a weak symbol |
| virtual ~JSObject(); |
| |
| JSValue prototype() const; |
| void setPrototype(JSGlobalData&, JSValue prototype); |
| bool setPrototypeWithCycleCheck(JSGlobalData&, JSValue prototype); |
| |
| void setStructure(JSGlobalData&, Structure*); |
| Structure* inheritorID(JSGlobalData&); |
| |
| virtual UString className() const; |
| |
| JSValue get(ExecState*, const Identifier& propertyName) const; |
| JSValue get(ExecState*, unsigned propertyName) const; |
| |
| bool getPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); |
| bool getPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); |
| bool getPropertyDescriptor(ExecState*, const Identifier& propertyName, PropertyDescriptor&); |
| |
| virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); |
| virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); |
| virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); |
| |
| virtual void put(ExecState*, const Identifier& propertyName, JSValue value, PutPropertySlot&); |
| virtual void put(ExecState*, unsigned propertyName, JSValue value); |
| |
| virtual void putWithAttributes(JSGlobalData*, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot); |
| virtual void putWithAttributes(JSGlobalData*, const Identifier& propertyName, JSValue value, unsigned attributes); |
| virtual void putWithAttributes(JSGlobalData*, unsigned propertyName, JSValue value, unsigned attributes); |
| virtual void putWithAttributes(ExecState*, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot); |
| virtual void putWithAttributes(ExecState*, const Identifier& propertyName, JSValue value, unsigned attributes); |
| virtual void putWithAttributes(ExecState*, unsigned propertyName, JSValue value, unsigned attributes); |
| |
| bool propertyIsEnumerable(ExecState*, const Identifier& propertyName) const; |
| |
| bool hasProperty(ExecState*, const Identifier& propertyName) const; |
| bool hasProperty(ExecState*, unsigned propertyName) const; |
| bool hasOwnProperty(ExecState*, const Identifier& propertyName) const; |
| |
| virtual bool deleteProperty(ExecState*, const Identifier& propertyName); |
| virtual bool deleteProperty(ExecState*, unsigned propertyName); |
| |
| virtual JSValue defaultValue(ExecState*, PreferredPrimitiveType) const; |
| |
| virtual bool hasInstance(ExecState*, JSValue, JSValue prototypeProperty); |
| |
| virtual void getPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); |
| virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); |
| |
| virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType = NoPreference) const; |
| virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue& value); |
| virtual bool toBoolean(ExecState*) const; |
| virtual double toNumber(ExecState*) const; |
| virtual UString toString(ExecState*) const; |
| virtual JSObject* toObject(ExecState*, JSGlobalObject*) const; |
| |
| virtual JSObject* toThisObject(ExecState*) const; |
| virtual JSValue toStrictThisObject(ExecState*) const; |
| virtual JSObject* unwrappedObject(); |
| |
| bool getPropertySpecificValue(ExecState* exec, const Identifier& propertyName, JSCell*& specificFunction) const; |
| |
| // This get function only looks at the property map. |
| JSValue getDirect(JSGlobalData& globalData, const Identifier& propertyName) const |
| { |
| size_t offset = m_structure->get(globalData, propertyName); |
| return offset != WTF::notFound ? getDirectOffset(offset) : JSValue(); |
| } |
| |
| WriteBarrierBase<Unknown>* getDirectLocation(JSGlobalData& globalData, const Identifier& propertyName) |
| { |
| size_t offset = m_structure->get(globalData, propertyName); |
| return offset != WTF::notFound ? locationForOffset(offset) : 0; |
| } |
| |
| WriteBarrierBase<Unknown>* getDirectLocation(JSGlobalData& globalData, const Identifier& propertyName, unsigned& attributes) |
| { |
| JSCell* specificFunction; |
| size_t offset = m_structure->get(globalData, propertyName, attributes, specificFunction); |
| return offset != WTF::notFound ? locationForOffset(offset) : 0; |
| } |
| |
| size_t offsetForLocation(WriteBarrierBase<Unknown>* location) const |
| { |
| return location - propertyStorage(); |
| } |
| |
| void transitionTo(JSGlobalData&, Structure*); |
| |
| void removeDirect(JSGlobalData&, const Identifier& propertyName); |
| bool hasCustomProperties() { return m_structure->didTransition(); } |
| bool hasGetterSetterProperties() { return m_structure->hasGetterSetterProperties(); } |
| |
| bool putDirect(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attr, bool checkReadOnly, PutPropertySlot&); |
| void putDirect(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attr = 0); |
| bool putDirect(JSGlobalData&, const Identifier& propertyName, JSValue, PutPropertySlot&); |
| |
| void putDirectFunction(JSGlobalData&, const Identifier& propertyName, JSCell*, unsigned attr = 0); |
| void putDirectFunction(JSGlobalData&, const Identifier& propertyName, JSCell*, unsigned attr, bool checkReadOnly, PutPropertySlot&); |
| void putDirectFunction(ExecState* exec, InternalFunction* function, unsigned attr = 0); |
| void putDirectFunction(ExecState* exec, JSFunction* function, unsigned attr = 0); |
| |
| void putDirectWithoutTransition(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attr = 0); |
| void putDirectFunctionWithoutTransition(JSGlobalData&, const Identifier& propertyName, JSCell* value, unsigned attr = 0); |
| void putDirectFunctionWithoutTransition(ExecState* exec, InternalFunction* function, unsigned attr = 0); |
| void putDirectFunctionWithoutTransition(ExecState* exec, JSFunction* function, unsigned attr = 0); |
| |
| // Fast access to known property offsets. |
| JSValue getDirectOffset(size_t offset) const { return propertyStorage()[offset].get(); } |
| void putDirectOffset(JSGlobalData& globalData, size_t offset, JSValue value) { propertyStorage()[offset].set(globalData, this, value); } |
| void putUndefinedAtDirectOffset(size_t offset) { propertyStorage()[offset].setUndefined(); } |
| |
| void fillGetterPropertySlot(PropertySlot&, WriteBarrierBase<Unknown>* location); |
| |
| virtual void defineGetter(ExecState*, const Identifier& propertyName, JSObject* getterFunction, unsigned attributes = 0); |
| virtual void defineSetter(ExecState*, const Identifier& propertyName, JSObject* setterFunction, unsigned attributes = 0); |
| virtual JSValue lookupGetter(ExecState*, const Identifier& propertyName); |
| virtual JSValue lookupSetter(ExecState*, const Identifier& propertyName); |
| virtual bool defineOwnProperty(ExecState*, const Identifier& propertyName, PropertyDescriptor&, bool shouldThrow); |
| |
| virtual bool isGlobalObject() const { return false; } |
| virtual bool isVariableObject() const { return false; } |
| virtual bool isActivationObject() const { return false; } |
| virtual bool isStrictModeFunction() const { return false; } |
| virtual bool isErrorInstance() const { return false; } |
| |
| void seal(JSGlobalData&); |
| void freeze(JSGlobalData&); |
| virtual void preventExtensions(JSGlobalData&); |
| bool isSealed(JSGlobalData& globalData) { return m_structure->isSealed(globalData); } |
| bool isFrozen(JSGlobalData& globalData) { return m_structure->isFrozen(globalData); } |
| bool isExtensible() { return m_structure->isExtensible(); } |
| |
| virtual ComplType exceptionType() const { return Throw; } |
| |
| void allocatePropertyStorage(size_t oldSize, size_t newSize); |
| bool isUsingInlineStorage() const { return static_cast<const void*>(m_propertyStorage) == static_cast<const void*>(this + 1); } |
| |
| void* addressOfPropertyAtOffset(size_t offset) |
| { |
| return static_cast<void*>(&m_propertyStorage[offset]); |
| } |
| |
| static const unsigned baseExternalStorageCapacity = 16; |
| |
| void flattenDictionaryObject(JSGlobalData& globalData) |
| { |
| m_structure->flattenDictionaryStructure(globalData, this); |
| } |
| |
| void putAnonymousValue(JSGlobalData& globalData, unsigned index, JSValue value) |
| { |
| ASSERT(index < m_structure->anonymousSlotCount()); |
| locationForOffset(index)->set(globalData, this, value); |
| } |
| void clearAnonymousValue(unsigned index) |
| { |
| ASSERT(index < m_structure->anonymousSlotCount()); |
| locationForOffset(index)->clear(); |
| } |
| JSValue getAnonymousValue(unsigned index) const |
| { |
| ASSERT(index < m_structure->anonymousSlotCount()); |
| return locationForOffset(index)->get(); |
| } |
| |
| static size_t offsetOfInlineStorage(); |
| static size_t offsetOfPropertyStorage(); |
| |
| static JS_EXPORTDATA const ClassInfo s_info; |
| |
| protected: |
| static Structure* createStructure(JSGlobalData& globalData, JSValue prototype) |
| { |
| return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info); |
| } |
| |
| static const unsigned StructureFlags = 0; |
| |
| void putThisToAnonymousValue(unsigned index) |
| { |
| locationForOffset(index)->setWithoutWriteBarrier(this); |
| } |
| |
| // To instantiate objects you likely want JSFinalObject, below. |
| // To create derived types you likely want JSNonFinalObject, below. |
| JSObject(JSGlobalData&, Structure*, PropertyStorage inlineStorage); |
| JSObject(VPtrStealingHackType, PropertyStorage inlineStorage) |
| : JSCell(VPtrStealingHack) |
| , m_propertyStorage(inlineStorage) |
| { |
| } |
| |
| private: |
| // Nobody should ever ask any of these questions on something already known to be a JSObject. |
| using JSCell::isAPIValueWrapper; |
| using JSCell::isGetterSetter; |
| using JSCell::toObject; |
| void getObject(); |
| void getString(ExecState* exec); |
| void isObject(); |
| void isString(); |
| |
| ConstPropertyStorage propertyStorage() const { return m_propertyStorage; } |
| PropertyStorage propertyStorage() { return m_propertyStorage; } |
| |
| const WriteBarrierBase<Unknown>* locationForOffset(size_t offset) const |
| { |
| return &propertyStorage()[offset]; |
| } |
| |
| WriteBarrierBase<Unknown>* locationForOffset(size_t offset) |
| { |
| return &propertyStorage()[offset]; |
| } |
| |
| bool putDirectInternal(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attr, bool checkReadOnly, PutPropertySlot&, JSCell*); |
| bool putDirectInternal(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attr, bool checkReadOnly, PutPropertySlot&); |
| void putDirectInternal(JSGlobalData&, const Identifier& propertyName, JSValue value, unsigned attr = 0); |
| |
| bool inlineGetOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); |
| |
| const HashEntry* findPropertyHashEntry(ExecState*, const Identifier& propertyName) const; |
| Structure* createInheritorID(JSGlobalData&); |
| |
| PropertyStorage m_propertyStorage; |
| WriteBarrier<Structure> m_inheritorID; |
| }; |
| |
| |
| #if USE(JSVALUE32_64) |
| #define JSNonFinalObject_inlineStorageCapacity 4 |
| #define JSFinalObject_inlineStorageCapacity 6 |
| #else |
| #define JSNonFinalObject_inlineStorageCapacity 2 |
| #define JSFinalObject_inlineStorageCapacity 4 |
| #endif |
| |
| COMPILE_ASSERT((JSFinalObject_inlineStorageCapacity >= JSNonFinalObject_inlineStorageCapacity), final_storage_is_at_least_as_large_as_non_final); |
| |
| // JSNonFinalObject is a type of JSObject that has some internal storage, |
| // but also preserves some space in the collector cell for additional |
| // data members in derived types. |
| class JSNonFinalObject : public JSObject { |
| friend class JSObject; |
| |
| public: |
| static Structure* createStructure(JSGlobalData& globalData, JSValue prototype) |
| { |
| return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info); |
| } |
| |
| protected: |
| explicit JSNonFinalObject(VPtrStealingHackType) |
| : JSObject(VPtrStealingHack, m_inlineStorage) |
| { |
| } |
| |
| explicit JSNonFinalObject(JSGlobalData& globalData, Structure* structure) |
| : JSObject(globalData, structure, m_inlineStorage) |
| { |
| ASSERT(!(OBJECT_OFFSETOF(JSNonFinalObject, m_inlineStorage) % sizeof(double))); |
| ASSERT(this->structure()->propertyStorageCapacity() == JSNonFinalObject_inlineStorageCapacity); |
| } |
| |
| private: |
| WriteBarrier<Unknown> m_inlineStorage[JSNonFinalObject_inlineStorageCapacity]; |
| }; |
| |
| // JSFinalObject is a type of JSObject that contains sufficent internal |
| // storage to fully make use of the colloctor cell containing it. |
| class JSFinalObject : public JSObject { |
| friend class JSObject; |
| |
| public: |
| static JSFinalObject* create(ExecState* exec, Structure* structure) |
| { |
| return new (allocateCell<JSFinalObject>(*exec->heap())) JSFinalObject(exec->globalData(), structure); |
| } |
| |
| static Structure* createStructure(JSGlobalData& globalData, JSValue prototype) |
| { |
| return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info); |
| } |
| |
| private: |
| explicit JSFinalObject(JSGlobalData& globalData, Structure* structure) |
| : JSObject(globalData, structure, m_inlineStorage) |
| { |
| ASSERT(OBJECT_OFFSETOF(JSFinalObject, m_inlineStorage) % sizeof(double) == 0); |
| ASSERT(this->structure()->propertyStorageCapacity() == JSFinalObject_inlineStorageCapacity); |
| } |
| |
| static const unsigned StructureFlags = JSObject::StructureFlags | IsJSFinalObject; |
| |
| WriteBarrierBase<Unknown> m_inlineStorage[JSFinalObject_inlineStorageCapacity]; |
| }; |
| |
| inline size_t JSObject::offsetOfInlineStorage() |
| { |
| ASSERT(OBJECT_OFFSETOF(JSFinalObject, m_inlineStorage) == OBJECT_OFFSETOF(JSNonFinalObject, m_inlineStorage)); |
| return OBJECT_OFFSETOF(JSFinalObject, m_inlineStorage); |
| } |
| |
| inline size_t JSObject::offsetOfPropertyStorage() |
| { |
| return OBJECT_OFFSETOF(JSObject, m_propertyStorage); |
| } |
| |
| inline JSObject* constructEmptyObject(ExecState* exec, Structure* structure) |
| { |
| return JSFinalObject::create(exec, structure); |
| } |
| |
| inline Structure* createEmptyObjectStructure(JSGlobalData& globalData, JSValue prototype) |
| { |
| return JSFinalObject::createStructure(globalData, prototype); |
| } |
| |
| inline JSObject* asObject(JSCell* cell) |
| { |
| ASSERT(cell->isObject()); |
| return static_cast<JSObject*>(cell); |
| } |
| |
| inline JSObject* asObject(JSValue value) |
| { |
| return asObject(value.asCell()); |
| } |
| |
| inline JSObject::JSObject(JSGlobalData& globalData, Structure* structure, PropertyStorage inlineStorage) |
| : JSCell(globalData, structure) |
| , m_propertyStorage(inlineStorage) |
| { |
| ASSERT(inherits(&s_info)); |
| ASSERT(m_structure->propertyStorageCapacity() < baseExternalStorageCapacity); |
| ASSERT(m_structure->isEmpty()); |
| ASSERT(prototype().isNull() || Heap::heap(this) == Heap::heap(prototype())); |
| ASSERT(static_cast<void*>(inlineStorage) == static_cast<void*>(this + 1)); |
| ASSERT(m_structure->typeInfo().type() == ObjectType); |
| } |
| |
| inline JSObject::~JSObject() |
| { |
| if (!isUsingInlineStorage()) |
| delete [] m_propertyStorage; |
| } |
| |
| inline JSValue JSObject::prototype() const |
| { |
| return m_structure->storedPrototype(); |
| } |
| |
| inline bool JSObject::setPrototypeWithCycleCheck(JSGlobalData& globalData, JSValue prototype) |
| { |
| JSValue nextPrototypeValue = prototype; |
| while (nextPrototypeValue && nextPrototypeValue.isObject()) { |
| JSObject* nextPrototype = asObject(nextPrototypeValue)->unwrappedObject(); |
| if (nextPrototype == this) |
| return false; |
| nextPrototypeValue = nextPrototype->prototype(); |
| } |
| setPrototype(globalData, prototype); |
| return true; |
| } |
| |
| inline void JSObject::setPrototype(JSGlobalData& globalData, JSValue prototype) |
| { |
| ASSERT(prototype); |
| setStructure(globalData, Structure::changePrototypeTransition(globalData, m_structure.get(), prototype)); |
| } |
| |
| inline void JSObject::setStructure(JSGlobalData& globalData, Structure* structure) |
| { |
| ASSERT(structure->typeInfo().overridesVisitChildren() == m_structure->typeInfo().overridesVisitChildren()); |
| m_structure.set(globalData, this, structure); |
| } |
| |
| inline Structure* JSObject::inheritorID(JSGlobalData& globalData) |
| { |
| if (m_inheritorID) { |
| ASSERT(m_inheritorID->isEmpty()); |
| return m_inheritorID.get(); |
| } |
| return createInheritorID(globalData); |
| } |
| |
| inline bool Structure::isUsingInlineStorage() const |
| { |
| return propertyStorageCapacity() < JSObject::baseExternalStorageCapacity; |
| } |
| |
| inline bool JSCell::inherits(const ClassInfo* info) const |
| { |
| for (const ClassInfo* ci = classInfo(); ci; ci = ci->parentClass) { |
| if (ci == info) |
| return true; |
| } |
| return false; |
| } |
| |
| // this method is here to be after the inline declaration of JSCell::inherits |
| inline bool JSValue::inherits(const ClassInfo* classInfo) const |
| { |
| return isCell() && asCell()->inherits(classInfo); |
| } |
| |
| ALWAYS_INLINE bool JSObject::inlineGetOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) |
| { |
| if (WriteBarrierBase<Unknown>* location = getDirectLocation(exec->globalData(), propertyName)) { |
| if (m_structure->hasGetterSetterProperties() && location->isGetterSetter()) |
| fillGetterPropertySlot(slot, location); |
| else |
| slot.setValue(this, location->get(), offsetForLocation(location)); |
| return true; |
| } |
| |
| // non-standard Netscape extension |
| if (propertyName == exec->propertyNames().underscoreProto) { |
| slot.setValue(prototype()); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // It may seem crazy to inline a function this large, especially a virtual function, |
| // but it makes a big difference to property lookup that derived classes can inline their |
| // base class call to this. |
| ALWAYS_INLINE bool JSObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) |
| { |
| return inlineGetOwnPropertySlot(exec, propertyName, slot); |
| } |
| |
| ALWAYS_INLINE bool JSCell::fastGetOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) |
| { |
| if (!structure()->typeInfo().overridesGetOwnPropertySlot()) |
| return asObject(this)->inlineGetOwnPropertySlot(exec, propertyName, slot); |
| return getOwnPropertySlot(exec, propertyName, slot); |
| } |
| |
| // It may seem crazy to inline a function this large but it makes a big difference |
| // since this is function very hot in variable lookup |
| ALWAYS_INLINE bool JSObject::getPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) |
| { |
| JSObject* object = this; |
| while (true) { |
| if (object->fastGetOwnPropertySlot(exec, propertyName, slot)) |
| return true; |
| JSValue prototype = object->prototype(); |
| if (!prototype.isObject()) |
| return false; |
| object = asObject(prototype); |
| } |
| } |
| |
| ALWAYS_INLINE bool JSObject::getPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot) |
| { |
| JSObject* object = this; |
| while (true) { |
| if (object->getOwnPropertySlot(exec, propertyName, slot)) |
| return true; |
| JSValue prototype = object->prototype(); |
| if (!prototype.isObject()) |
| return false; |
| object = asObject(prototype); |
| } |
| } |
| |
| inline JSValue JSObject::get(ExecState* exec, const Identifier& propertyName) const |
| { |
| PropertySlot slot(this); |
| if (const_cast<JSObject*>(this)->getPropertySlot(exec, propertyName, slot)) |
| return slot.getValue(exec, propertyName); |
| |
| return jsUndefined(); |
| } |
| |
| inline JSValue JSObject::get(ExecState* exec, unsigned propertyName) const |
| { |
| PropertySlot slot(this); |
| if (const_cast<JSObject*>(this)->getPropertySlot(exec, propertyName, slot)) |
| return slot.getValue(exec, propertyName); |
| |
| return jsUndefined(); |
| } |
| |
| inline bool JSObject::putDirectInternal(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot, JSCell* specificFunction) |
| { |
| ASSERT(value); |
| ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this)); |
| |
| if (m_structure->isDictionary()) { |
| unsigned currentAttributes; |
| JSCell* currentSpecificFunction; |
| size_t offset = m_structure->get(globalData, propertyName, currentAttributes, currentSpecificFunction); |
| if (offset != WTF::notFound) { |
| // If there is currently a specific function, and there now either isn't, |
| // or the new value is different, then despecify. |
| if (currentSpecificFunction && (specificFunction != currentSpecificFunction)) |
| m_structure->despecifyDictionaryFunction(globalData, propertyName); |
| if (checkReadOnly && currentAttributes & ReadOnly) |
| return false; |
| |
| putDirectOffset(globalData, offset, value); |
| // At this point, the objects structure only has a specific value set if previously there |
| // had been one set, and if the new value being specified is the same (otherwise we would |
| // have despecified, above). So, if currentSpecificFunction is not set, or if the new |
| // value is different (or there is no new value), then the slot now has no value - and |
| // as such it is cachable. |
| // If there was previously a value, and the new value is the same, then we cannot cache. |
| if (!currentSpecificFunction || (specificFunction != currentSpecificFunction)) |
| slot.setExistingProperty(this, offset); |
| return true; |
| } |
| |
| if (!isExtensible()) |
| return false; |
| |
| size_t currentCapacity = m_structure->propertyStorageCapacity(); |
| offset = m_structure->addPropertyWithoutTransition(globalData, propertyName, attributes, specificFunction); |
| if (currentCapacity != m_structure->propertyStorageCapacity()) |
| allocatePropertyStorage(currentCapacity, m_structure->propertyStorageCapacity()); |
| |
| ASSERT(offset < m_structure->propertyStorageCapacity()); |
| putDirectOffset(globalData, offset, value); |
| // See comment on setNewProperty call below. |
| if (!specificFunction) |
| slot.setNewProperty(this, offset); |
| return true; |
| } |
| |
| size_t offset; |
| size_t currentCapacity = m_structure->propertyStorageCapacity(); |
| if (Structure* structure = Structure::addPropertyTransitionToExistingStructure(m_structure.get(), propertyName, attributes, specificFunction, offset)) { |
| if (currentCapacity != structure->propertyStorageCapacity()) |
| allocatePropertyStorage(currentCapacity, structure->propertyStorageCapacity()); |
| |
| ASSERT(offset < structure->propertyStorageCapacity()); |
| setStructure(globalData, structure); |
| putDirectOffset(globalData, offset, value); |
| // This is a new property; transitions with specific values are not currently cachable, |
| // so leave the slot in an uncachable state. |
| if (!specificFunction) |
| slot.setNewProperty(this, offset); |
| return true; |
| } |
| |
| unsigned currentAttributes; |
| JSCell* currentSpecificFunction; |
| offset = m_structure->get(globalData, propertyName, currentAttributes, currentSpecificFunction); |
| if (offset != WTF::notFound) { |
| if (checkReadOnly && currentAttributes & ReadOnly) |
| return false; |
| |
| // There are three possibilities here: |
| // (1) There is an existing specific value set, and we're overwriting with *the same value*. |
| // * Do nothing - no need to despecify, but that means we can't cache (a cached |
| // put could write a different value). Leave the slot in an uncachable state. |
| // (2) There is a specific value currently set, but we're writing a different value. |
| // * First, we have to despecify. Having done so, this is now a regular slot |
| // with no specific value, so go ahead & cache like normal. |
| // (3) Normal case, there is no specific value set. |
| // * Go ahead & cache like normal. |
| if (currentSpecificFunction) { |
| // case (1) Do the put, then return leaving the slot uncachable. |
| if (specificFunction == currentSpecificFunction) { |
| putDirectOffset(globalData, offset, value); |
| return true; |
| } |
| // case (2) Despecify, fall through to (3). |
| setStructure(globalData, Structure::despecifyFunctionTransition(globalData, m_structure.get(), propertyName)); |
| } |
| |
| // case (3) set the slot, do the put, return. |
| slot.setExistingProperty(this, offset); |
| putDirectOffset(globalData, offset, value); |
| return true; |
| } |
| |
| if (!isExtensible()) |
| return false; |
| |
| Structure* structure = Structure::addPropertyTransition(globalData, m_structure.get(), propertyName, attributes, specificFunction, offset); |
| |
| if (currentCapacity != structure->propertyStorageCapacity()) |
| allocatePropertyStorage(currentCapacity, structure->propertyStorageCapacity()); |
| |
| ASSERT(offset < structure->propertyStorageCapacity()); |
| setStructure(globalData, structure); |
| putDirectOffset(globalData, offset, value); |
| // This is a new property; transitions with specific values are not currently cachable, |
| // so leave the slot in an uncachable state. |
| if (!specificFunction) |
| slot.setNewProperty(this, offset); |
| return true; |
| } |
| |
| inline bool JSObject::putDirectInternal(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot) |
| { |
| ASSERT(value); |
| ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this)); |
| |
| return putDirectInternal(globalData, propertyName, value, attributes, checkReadOnly, slot, getJSFunction(globalData, value)); |
| } |
| |
| inline void JSObject::putDirectInternal(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes) |
| { |
| PutPropertySlot slot; |
| putDirectInternal(globalData, propertyName, value, attributes, false, slot, getJSFunction(globalData, value)); |
| } |
| |
| inline bool JSObject::putDirect(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot) |
| { |
| ASSERT(value); |
| ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this)); |
| |
| return putDirectInternal(globalData, propertyName, value, attributes, checkReadOnly, slot, 0); |
| } |
| |
| inline void JSObject::putDirect(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes) |
| { |
| PutPropertySlot slot; |
| putDirectInternal(globalData, propertyName, value, attributes, false, slot, 0); |
| } |
| |
| inline bool JSObject::putDirect(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, PutPropertySlot& slot) |
| { |
| return putDirectInternal(globalData, propertyName, value, 0, false, slot, 0); |
| } |
| |
| inline void JSObject::putDirectFunction(JSGlobalData& globalData, const Identifier& propertyName, JSCell* value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot) |
| { |
| putDirectInternal(globalData, propertyName, value, attributes, checkReadOnly, slot, value); |
| } |
| |
| inline void JSObject::putDirectFunction(JSGlobalData& globalData, const Identifier& propertyName, JSCell* value, unsigned attr) |
| { |
| PutPropertySlot slot; |
| putDirectInternal(globalData, propertyName, value, attr, false, slot, value); |
| } |
| |
| inline void JSObject::putDirectWithoutTransition(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes) |
| { |
| size_t currentCapacity = m_structure->propertyStorageCapacity(); |
| size_t offset = m_structure->addPropertyWithoutTransition(globalData, propertyName, attributes, 0); |
| if (currentCapacity != m_structure->propertyStorageCapacity()) |
| allocatePropertyStorage(currentCapacity, m_structure->propertyStorageCapacity()); |
| putDirectOffset(globalData, offset, value); |
| } |
| |
| inline void JSObject::putDirectFunctionWithoutTransition(JSGlobalData& globalData, const Identifier& propertyName, JSCell* value, unsigned attributes) |
| { |
| size_t currentCapacity = m_structure->propertyStorageCapacity(); |
| size_t offset = m_structure->addPropertyWithoutTransition(globalData, propertyName, attributes, value); |
| if (currentCapacity != m_structure->propertyStorageCapacity()) |
| allocatePropertyStorage(currentCapacity, m_structure->propertyStorageCapacity()); |
| putDirectOffset(globalData, offset, value); |
| } |
| |
| inline void JSObject::transitionTo(JSGlobalData& globalData, Structure* newStructure) |
| { |
| if (m_structure->propertyStorageCapacity() != newStructure->propertyStorageCapacity()) |
| allocatePropertyStorage(m_structure->propertyStorageCapacity(), newStructure->propertyStorageCapacity()); |
| setStructure(globalData, newStructure); |
| } |
| |
| inline JSValue JSObject::toPrimitive(ExecState* exec, PreferredPrimitiveType preferredType) const |
| { |
| return defaultValue(exec, preferredType); |
| } |
| |
| inline JSValue JSValue::get(ExecState* exec, const Identifier& propertyName) const |
| { |
| PropertySlot slot(asValue()); |
| return get(exec, propertyName, slot); |
| } |
| |
| inline JSValue JSValue::get(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) const |
| { |
| if (UNLIKELY(!isCell())) { |
| JSObject* prototype = synthesizePrototype(exec); |
| if (propertyName == exec->propertyNames().underscoreProto) |
| return prototype; |
| if (!prototype->getPropertySlot(exec, propertyName, slot)) |
| return jsUndefined(); |
| return slot.getValue(exec, propertyName); |
| } |
| JSCell* cell = asCell(); |
| while (true) { |
| if (cell->fastGetOwnPropertySlot(exec, propertyName, slot)) |
| return slot.getValue(exec, propertyName); |
| JSValue prototype = asObject(cell)->prototype(); |
| if (!prototype.isObject()) |
| return jsUndefined(); |
| cell = asObject(prototype); |
| } |
| } |
| |
| inline JSValue JSValue::get(ExecState* exec, unsigned propertyName) const |
| { |
| PropertySlot slot(asValue()); |
| return get(exec, propertyName, slot); |
| } |
| |
| inline JSValue JSValue::get(ExecState* exec, unsigned propertyName, PropertySlot& slot) const |
| { |
| if (UNLIKELY(!isCell())) { |
| JSObject* prototype = synthesizePrototype(exec); |
| if (!prototype->getPropertySlot(exec, propertyName, slot)) |
| return jsUndefined(); |
| return slot.getValue(exec, propertyName); |
| } |
| JSCell* cell = const_cast<JSCell*>(asCell()); |
| while (true) { |
| if (cell->getOwnPropertySlot(exec, propertyName, slot)) |
| return slot.getValue(exec, propertyName); |
| JSValue prototype = asObject(cell)->prototype(); |
| if (!prototype.isObject()) |
| return jsUndefined(); |
| cell = prototype.asCell(); |
| } |
| } |
| |
| inline void JSValue::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot) |
| { |
| if (UNLIKELY(!isCell())) { |
| synthesizeObject(exec)->put(exec, propertyName, value, slot); |
| return; |
| } |
| asCell()->put(exec, propertyName, value, slot); |
| } |
| |
| inline void JSValue::putDirect(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot) |
| { |
| ASSERT(isCell() && isObject()); |
| if (!asObject(asCell())->putDirect(exec->globalData(), propertyName, value, slot) && slot.isStrictMode()) |
| throwTypeError(exec, StrictModeReadonlyPropertyWriteError); |
| } |
| |
| inline void JSValue::put(ExecState* exec, unsigned propertyName, JSValue value) |
| { |
| if (UNLIKELY(!isCell())) { |
| synthesizeObject(exec)->put(exec, propertyName, value); |
| return; |
| } |
| asCell()->put(exec, propertyName, value); |
| } |
| |
| ALWAYS_INLINE void JSObject::visitChildrenDirect(SlotVisitor& visitor) |
| { |
| JSCell::visitChildren(visitor); |
| |
| PropertyStorage storage = propertyStorage(); |
| size_t storageSize = m_structure->propertyStorageSize(); |
| visitor.appendValues(storage, storageSize); |
| if (m_inheritorID) |
| visitor.append(&m_inheritorID); |
| } |
| |
| // --- JSValue inlines ---------------------------- |
| |
| ALWAYS_INLINE UString JSValue::toThisString(ExecState* exec) const |
| { |
| return isString() ? static_cast<JSString*>(asCell())->value(exec) : toThisObject(exec)->toString(exec); |
| } |
| |
| inline JSString* JSValue::toThisJSString(ExecState* exec) const |
| { |
| return isString() ? static_cast<JSString*>(asCell()) : jsString(exec, toThisObject(exec)->toString(exec)); |
| } |
| |
| inline JSValue JSValue::toStrictThisObject(ExecState* exec) const |
| { |
| if (!isObject()) |
| return *this; |
| return asObject(asCell())->toStrictThisObject(exec); |
| } |
| |
| ALWAYS_INLINE JSObject* Register::function() const |
| { |
| if (!jsValue()) |
| return 0; |
| return asObject(jsValue()); |
| } |
| |
| ALWAYS_INLINE Register Register::withCallee(JSObject* callee) |
| { |
| Register r; |
| r = JSValue(callee); |
| return r; |
| } |
| |
| } // namespace JSC |
| |
| #endif // JSObject_h |
