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JSObject.h
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890 lines (737 loc) · 35.5 KB
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/*
* Copyright (C) 1999-2001 Harri Porten ([email protected])
* Copyright (C) 2001 Peter Kelly ([email protected])
* 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 "CallFrame.h"
#include "JSCell.h"
#include "PropertySlot.h"
#include "PutPropertySlot.h"
#include "ScopeChain.h"
#include "StorageBarrier.h"
#include "Structure.h"
#include "JSGlobalData.h"
#include "JSString.h"
#include <wtf/StdLibExtras.h>
namespace JSC {
inline JSCell* getJSFunction(JSValue value)
{
if (value.isCell() && (value.asCell()->structure()->typeInfo().type() == JSFunctionType))
return value.asCell();
return 0;
}
class GetterSetter;
class HashEntry;
class InternalFunction;
class LLIntOffsetsExtractor;
class MarkedBlock;
class PropertyDescriptor;
class PropertyNameArray;
class Structure;
struct HashTable;
JS_EXPORT_PRIVATE JSObject* throwTypeError(ExecState*, const UString&);
extern JS_EXPORTDATA 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
Accessor = 1 << 5, // property is a getter/setter
};
class JSObject : public JSCell {
friend class BatchedTransitionOptimizer;
friend class JIT;
friend class JSCell;
friend class MarkedBlock;
JS_EXPORT_PRIVATE friend bool setUpStaticFunctionSlot(ExecState* exec, const HashEntry* entry, JSObject* thisObj, const Identifier& propertyName, PropertySlot& slot);
enum PutMode {
PutModePut,
PutModeDefineOwnProperty,
};
public:
typedef JSCell Base;
JS_EXPORT_PRIVATE static void visitChildren(JSCell*, SlotVisitor&);
JS_EXPORT_PRIVATE static UString className(const JSObject*);
JSValue prototype() const;
void setPrototype(JSGlobalData&, JSValue prototype);
bool setPrototypeWithCycleCheck(JSGlobalData&, JSValue prototype);
Structure* inheritorID(JSGlobalData&);
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&);
JS_EXPORT_PRIVATE bool getPropertyDescriptor(ExecState*, const Identifier& propertyName, PropertyDescriptor&);
static bool getOwnPropertySlot(JSCell*, ExecState*, const Identifier& propertyName, PropertySlot&);
JS_EXPORT_PRIVATE static bool getOwnPropertySlotByIndex(JSCell*, ExecState*, unsigned propertyName, PropertySlot&);
JS_EXPORT_PRIVATE static bool getOwnPropertyDescriptor(JSObject*, ExecState*, const Identifier&, PropertyDescriptor&);
bool allowsAccessFrom(ExecState*);
JS_EXPORT_PRIVATE static void put(JSCell*, ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
JS_EXPORT_PRIVATE static void putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
// putDirect is effectively an unchecked vesion of 'defineOwnProperty':
// - the prototype chain is not consulted
// - accessors are not called.
// - attributes will be respected (after the call the property will exist with the given attributes)
JS_EXPORT_PRIVATE static void putDirectVirtual(JSObject*, ExecState*, const Identifier& propertyName, JSValue, unsigned attributes);
void putDirect(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attributes = 0);
void putDirect(JSGlobalData&, const Identifier& propertyName, JSValue, PutPropertySlot&);
void putDirectWithoutTransition(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attributes = 0);
void putDirectAccessor(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attributes);
bool propertyIsEnumerable(ExecState*, const Identifier& propertyName) const;
JS_EXPORT_PRIVATE bool hasProperty(ExecState*, const Identifier& propertyName) const;
JS_EXPORT_PRIVATE bool hasProperty(ExecState*, unsigned propertyName) const;
bool hasOwnProperty(ExecState*, const Identifier& propertyName) const;
JS_EXPORT_PRIVATE static bool deleteProperty(JSCell*, ExecState*, const Identifier& propertyName);
JS_EXPORT_PRIVATE static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
JS_EXPORT_PRIVATE static JSValue defaultValue(const JSObject*, ExecState*, PreferredPrimitiveType);
JS_EXPORT_PRIVATE static bool hasInstance(JSObject*, ExecState*, JSValue, JSValue prototypeProperty);
JS_EXPORT_PRIVATE static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
JS_EXPORT_PRIVATE static void getPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
JSValue toPrimitive(ExecState*, PreferredPrimitiveType = NoPreference) const;
JS_EXPORT_PRIVATE bool toBoolean(ExecState*) const;
bool getPrimitiveNumber(ExecState*, double& number, JSValue&) const;
JS_EXPORT_PRIVATE double toNumber(ExecState*) const;
JS_EXPORT_PRIVATE JSString* toString(ExecState*) const;
// NOTE: JSObject and its subclasses must be able to gracefully handle ExecState* = 0,
// because this call may come from inside the compiler.
JS_EXPORT_PRIVATE static JSObject* toThisObject(JSCell*, ExecState*);
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 = structure()->get(globalData, propertyName);
return offset != WTF::notFound ? getDirectOffset(offset) : JSValue();
}
WriteBarrierBase<Unknown>* getDirectLocation(JSGlobalData& globalData, const Identifier& propertyName)
{
size_t offset = 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 = 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 structure()->didTransition(); }
bool hasGetterSetterProperties() { return structure()->hasGetterSetterProperties(); }
// putOwnDataProperty has 'put' like semantics, however this method:
// - assumes the object contains no own getter/setter properties.
// - provides no special handling for __proto__
// - does not walk the prototype chain (to check for accessors or non-writable properties).
// This is used by JSActivation.
bool putOwnDataProperty(JSGlobalData&, const Identifier& propertyName, JSValue, PutPropertySlot&);
// 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(); }
JS_EXPORT_PRIVATE static bool defineOwnProperty(JSObject*, ExecState*, const Identifier& propertyName, PropertyDescriptor&, bool shouldThrow);
bool isGlobalObject() const;
bool isVariableObject() const;
bool isStaticScopeObject() const;
bool isActivationObject() const;
bool isErrorInstance() const;
bool isGlobalThis() const;
void seal(JSGlobalData&);
void freeze(JSGlobalData&);
JS_EXPORT_PRIVATE void preventExtensions(JSGlobalData&);
bool isSealed(JSGlobalData& globalData) { return structure()->isSealed(globalData); }
bool isFrozen(JSGlobalData& globalData) { return structure()->isFrozen(globalData); }
bool isExtensible() { return structure()->isExtensible(); }
bool staticFunctionsReified() { return structure()->staticFunctionsReified(); }
void reifyStaticFunctionsForDelete(ExecState* exec);
JS_EXPORT_PRIVATE PropertyStorage growPropertyStorage(JSGlobalData&, size_t oldSize, size_t newSize);
bool isUsingInlineStorage() const { return static_cast<const void*>(m_propertyStorage.get()) == static_cast<const void*>(this + 1); }
void setPropertyStorage(JSGlobalData&, PropertyStorage, Structure*);
void* addressOfPropertyStorage()
{
return &m_propertyStorage;
}
static const unsigned baseExternalStorageCapacity = 16;
void flattenDictionaryObject(JSGlobalData& globalData)
{
structure()->flattenDictionaryStructure(globalData, this);
}
JSGlobalObject* globalObject() const
{
ASSERT(structure()->globalObject());
ASSERT(!isGlobalObject() || ((JSObject*)structure()->globalObject()) == this);
return structure()->globalObject();
}
static size_t offsetOfInlineStorage();
static size_t offsetOfPropertyStorage();
static size_t offsetOfInheritorID();
static JS_EXPORTDATA const ClassInfo s_info;
protected:
void finishCreation(JSGlobalData& globalData, PropertyStorage inlineStorage)
{
Base::finishCreation(globalData);
ASSERT(inherits(&s_info));
ASSERT(structure()->propertyStorageCapacity() < baseExternalStorageCapacity);
ASSERT(structure()->isEmpty());
ASSERT(prototype().isNull() || Heap::heap(this) == Heap::heap(prototype()));
ASSERT_UNUSED(inlineStorage, static_cast<void*>(inlineStorage) == static_cast<void*>(this + 1));
ASSERT(structure()->isObject());
ASSERT(classInfo());
}
static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(globalData, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), &s_info);
}
static const unsigned StructureFlags = 0;
// To instantiate objects you likely want JSFinalObject, below.
// To create derived types you likely want JSNonFinalObject, below.
JSObject(JSGlobalData&, Structure*, PropertyStorage inlineStorage);
void resetInheritorID()
{
m_inheritorID.clear();
}
private:
friend class LLIntOffsetsExtractor;
// Nobody should ever ask any of these questions on something already known to be a JSObject.
using JSCell::isAPIValueWrapper;
using JSCell::isGetterSetter;
void getObject();
void getString(ExecState* exec);
void isObject();
void isString();
ConstPropertyStorage propertyStorage() const { return m_propertyStorage.get(); }
PropertyStorage propertyStorage() { return m_propertyStorage.get(); }
const WriteBarrierBase<Unknown>* locationForOffset(size_t offset) const
{
return &propertyStorage()[offset];
}
WriteBarrierBase<Unknown>* locationForOffset(size_t offset)
{
return &propertyStorage()[offset];
}
template<PutMode>
bool putDirectInternal(JSGlobalData&, const Identifier& propertyName, JSValue, unsigned attr, PutPropertySlot&, JSCell*);
bool inlineGetOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
JS_EXPORT_PRIVATE void fillGetterPropertySlot(PropertySlot&, WriteBarrierBase<Unknown>* location);
const HashEntry* findPropertyHashEntry(ExecState*, const Identifier& propertyName) const;
Structure* createInheritorID(JSGlobalData&);
StorageBarrier 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:
typedef JSObject Base;
static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(globalData, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), &s_info);
}
protected:
explicit JSNonFinalObject(JSGlobalData& globalData, Structure* structure)
: JSObject(globalData, structure, m_inlineStorage)
{
}
void finishCreation(JSGlobalData& globalData)
{
Base::finishCreation(globalData, m_inlineStorage);
ASSERT(!(OBJECT_OFFSETOF(JSNonFinalObject, m_inlineStorage) % sizeof(double)));
ASSERT(this->structure()->propertyStorageCapacity() == JSNonFinalObject_inlineStorageCapacity);
ASSERT(classInfo());
}
private:
WriteBarrier<Unknown> m_inlineStorage[JSNonFinalObject_inlineStorageCapacity];
};
class JSFinalObject;
// 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:
typedef JSObject Base;
static JSFinalObject* create(ExecState*, Structure*);
static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(globalData, globalObject, prototype, TypeInfo(FinalObjectType, StructureFlags), &s_info);
}
static JS_EXPORTDATA const ClassInfo s_info;
protected:
void finishCreation(JSGlobalData& globalData)
{
Base::finishCreation(globalData, m_inlineStorage);
ASSERT(!(OBJECT_OFFSETOF(JSFinalObject, m_inlineStorage) % sizeof(double)));
ASSERT(this->structure()->propertyStorageCapacity() == JSFinalObject_inlineStorageCapacity);
ASSERT(classInfo());
}
private:
friend class LLIntOffsetsExtractor;
explicit JSFinalObject(JSGlobalData& globalData, Structure* structure)
: JSObject(globalData, structure, m_inlineStorage)
{
}
static const unsigned StructureFlags = JSObject::StructureFlags;
WriteBarrierBase<Unknown> m_inlineStorage[JSFinalObject_inlineStorageCapacity];
};
inline JSFinalObject* JSFinalObject::create(ExecState* exec, Structure* structure)
{
JSFinalObject* finalObject = new (NotNull, allocateCell<JSFinalObject>(*exec->heap())) JSFinalObject(exec->globalData(), structure);
finalObject->finishCreation(exec->globalData());
return finalObject;
}
inline bool isJSFinalObject(JSCell* cell)
{
return cell->classInfo() == &JSFinalObject::s_info;
}
inline bool isJSFinalObject(JSValue value)
{
return value.isCell() && isJSFinalObject(value.asCell());
}
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 size_t JSObject::offsetOfInheritorID()
{
return OBJECT_OFFSETOF(JSObject, m_inheritorID);
}
inline bool JSObject::isGlobalObject() const
{
return structure()->typeInfo().type() == GlobalObjectType;
}
inline bool JSObject::isVariableObject() const
{
return structure()->typeInfo().type() >= VariableObjectType;
}
inline bool JSObject::isStaticScopeObject() const
{
return structure()->typeInfo().type() == StaticScopeObjectType;
}
inline bool JSObject::isActivationObject() const
{
return structure()->typeInfo().type() == ActivationObjectType;
}
inline bool JSObject::isErrorInstance() const
{
return structure()->typeInfo().type() == ErrorInstanceType;
}
inline bool JSObject::isGlobalThis() const
{
return structure()->typeInfo().type() == GlobalThisType;
}
inline void JSObject::setPropertyStorage(JSGlobalData& globalData, PropertyStorage storage, Structure* structure)
{
ASSERT(storage);
ASSERT(structure);
setStructure(globalData, structure);
m_propertyStorage.set(globalData, this, storage);
}
inline JSObject* constructEmptyObject(ExecState* exec, Structure* structure)
{
return JSFinalObject::create(exec, structure);
}
inline CallType getCallData(JSValue value, CallData& callData)
{
CallType result = value.isCell() ? value.asCell()->methodTable()->getCallData(value.asCell(), callData) : CallTypeNone;
ASSERT(result == CallTypeNone || value.isValidCallee());
return result;
}
inline ConstructType getConstructData(JSValue value, ConstructData& constructData)
{
ConstructType result = value.isCell() ? value.asCell()->methodTable()->getConstructData(value.asCell(), constructData) : ConstructTypeNone;
ASSERT(result == ConstructTypeNone || value.isValidCallee());
return result;
}
inline Structure* createEmptyObjectStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
{
return JSFinalObject::createStructure(globalData, globalObject, prototype);
}
inline JSObject* asObject(JSCell* cell)
{
ASSERT(cell->isObject());
return jsCast<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(globalData, this, inlineStorage)
{
}
inline JSValue JSObject::prototype() const
{
return structure()->storedPrototype();
}
inline void JSObject::setPrototype(JSGlobalData& globalData, JSValue prototype)
{
ASSERT(prototype);
setStructure(globalData, Structure::changePrototypeTransition(globalData, structure(), prototype));
}
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
{
return classInfo()->isSubClassOf(info);
}
inline const MethodTable* JSCell::methodTable() const
{
return &classInfo()->methodTable;
}
// 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);
}
inline JSObject* JSValue::toThisObject(ExecState* exec) const
{
return isCell() ? asCell()->methodTable()->toThisObject(asCell(), exec) : toThisObjectSlowCase(exec);
}
ALWAYS_INLINE bool JSObject::inlineGetOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
if (WriteBarrierBase<Unknown>* location = getDirectLocation(exec->globalData(), propertyName)) {
if (structure()->hasGetterSetterProperties() && location->isGetterSetter())
fillGetterPropertySlot(slot, location);
else
slot.setValue(this, location->get(), offsetForLocation(location));
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(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
return jsCast<JSObject*>(cell)->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 methodTable()->getOwnPropertySlot(this, exec, propertyName, slot);
}
// Fast call to get a property where we may not yet have converted the string to an
// identifier. The first time we perform a property access with a given string, try
// performing the property map lookup without forming an identifier. We detect this
// case by checking whether the hash has yet been set for this string.
ALWAYS_INLINE JSValue JSCell::fastGetOwnProperty(ExecState* exec, const UString& name)
{
if (!structure()->typeInfo().overridesGetOwnPropertySlot() && !structure()->hasGetterSetterProperties()) {
size_t offset = name.impl()->hasHash()
? structure()->get(exec->globalData(), Identifier(exec, name))
: structure()->get(exec->globalData(), name);
if (offset != WTF::notFound)
return asObject(this)->locationForOffset(offset)->get();
}
return JSValue();
}
// 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->methodTable()->getOwnPropertySlotByIndex(object, 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();
}
template<JSObject::PutMode mode>
inline bool JSObject::putDirectInternal(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes, PutPropertySlot& slot, JSCell* specificFunction)
{
ASSERT(value);
ASSERT(value.isGetterSetter() == !!(attributes & Accessor));
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
if (structure()->isDictionary()) {
unsigned currentAttributes;
JSCell* currentSpecificFunction;
size_t offset = 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))
structure()->despecifyDictionaryFunction(globalData, propertyName);
if ((mode == PutModePut) && 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 ((mode == PutModePut) && !isExtensible())
return false;
PropertyStorage newStorage = propertyStorage();
if (structure()->shouldGrowPropertyStorage())
newStorage = growPropertyStorage(globalData, structure()->propertyStorageCapacity(), structure()->suggestedNewPropertyStorageSize());
offset = structure()->addPropertyWithoutTransition(globalData, propertyName, attributes, specificFunction);
setPropertyStorage(globalData, newStorage, structure());
ASSERT(offset < 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 = structure()->propertyStorageCapacity();
if (Structure* structure = Structure::addPropertyTransitionToExistingStructure(this->structure(), propertyName, attributes, specificFunction, offset)) {
PropertyStorage newStorage = propertyStorage();
if (currentCapacity != structure->propertyStorageCapacity())
newStorage = growPropertyStorage(globalData, currentCapacity, structure->propertyStorageCapacity());
ASSERT(offset < structure->propertyStorageCapacity());
setPropertyStorage(globalData, newStorage, 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 = structure()->get(globalData, propertyName, currentAttributes, currentSpecificFunction);
if (offset != WTF::notFound) {
if ((mode == PutModePut) && 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, structure(), propertyName));
}
// case (3) set the slot, do the put, return.
slot.setExistingProperty(this, offset);
putDirectOffset(globalData, offset, value);
return true;
}
if ((mode == PutModePut) && !isExtensible())
return false;
PropertyStorage newStorage = propertyStorage();
if (structure()->shouldGrowPropertyStorage())
newStorage = growPropertyStorage(globalData, structure()->propertyStorageCapacity(), structure()->suggestedNewPropertyStorageSize());
Structure* structure = Structure::addPropertyTransition(globalData, this->structure(), propertyName, attributes, specificFunction, offset);
ASSERT(offset < structure->propertyStorageCapacity());
setPropertyStorage(globalData, newStorage, 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::putOwnDataProperty(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
{
ASSERT(value);
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
ASSERT(!structure()->hasGetterSetterProperties());
return putDirectInternal<PutModePut>(globalData, propertyName, value, 0, slot, getJSFunction(value));
}
inline void JSObject::putDirect(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes)
{
ASSERT(!value.isGetterSetter() && !(attributes & Accessor));
PutPropertySlot slot;
putDirectInternal<PutModeDefineOwnProperty>(globalData, propertyName, value, attributes, slot, getJSFunction(value));
}
inline void JSObject::putDirect(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
{
ASSERT(!value.isGetterSetter());
putDirectInternal<PutModeDefineOwnProperty>(globalData, propertyName, value, 0, slot, getJSFunction(value));
}
inline void JSObject::putDirectWithoutTransition(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes)
{
ASSERT(!value.isGetterSetter() && !(attributes & Accessor));
PropertyStorage newStorage = propertyStorage();
if (structure()->shouldGrowPropertyStorage())
newStorage = growPropertyStorage(globalData, structure()->propertyStorageCapacity(), structure()->suggestedNewPropertyStorageSize());
size_t offset = structure()->addPropertyWithoutTransition(globalData, propertyName, attributes, getJSFunction(value));
setPropertyStorage(globalData, newStorage, structure());
putDirectOffset(globalData, offset, value);
}
inline void JSObject::transitionTo(JSGlobalData& globalData, Structure* newStructure)
{
PropertyStorage newStorage = propertyStorage();
if (structure()->propertyStorageCapacity() != newStructure->propertyStorageCapacity())
newStorage = growPropertyStorage(globalData, structure()->propertyStorageCapacity(), newStructure->propertyStorageCapacity());
setPropertyStorage(globalData, newStorage, newStructure);
}
inline JSValue JSObject::toPrimitive(ExecState* exec, PreferredPrimitiveType preferredType) const
{
return methodTable()->defaultValue(this, 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 (!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->methodTable()->getOwnPropertySlotByIndex(cell, 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())) {
putToPrimitive(exec, propertyName, value, slot);
return;
}
asCell()->methodTable()->put(asCell(), exec, propertyName, value, slot);
}
inline void JSValue::putByIndex(ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
{
if (UNLIKELY(!isCell())) {
PutPropertySlot slot(shouldThrow);
putToPrimitive(exec, Identifier::from(exec, propertyName), value, slot);
return;
}
asCell()->methodTable()->putByIndex(asCell(), exec, propertyName, value, shouldThrow);
}
// --- JSValue inlines ----------------------------
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