/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
- * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2007 Eric Seidel (eric@webkit.org)
*
* This library is free software; you can redistribute it and/or
#include "DatePrototype.h"
#include "ErrorConstructor.h"
#include "GetterSetter.h"
+#include "JSFunction.h"
#include "JSGlobalObject.h"
#include "NativeErrorConstructor.h"
#include "ObjectPrototype.h"
+#include "PropertyDescriptor.h"
#include "PropertyNameArray.h"
#include "Lookup.h"
#include "Nodes.h"
#include <math.h>
#include <wtf/Assertions.h>
-#define JSOBJECT_MARK_TRACING 0
-
-#if JSOBJECT_MARK_TRACING
-
-#define JSOBJECT_MARK_BEGIN() \
- static int markStackDepth = 0; \
- for (int i = 0; i < markStackDepth; i++) \
- putchar('-'); \
- printf("%s (%p)\n", className().UTF8String().c_str(), this); \
- markStackDepth++; \
-
-#define JSOBJECT_MARK_END() \
- markStackDepth--;
-
-#else // JSOBJECT_MARK_TRACING
-
-#define JSOBJECT_MARK_BEGIN()
-#define JSOBJECT_MARK_END()
-
-#endif // JSOBJECT_MARK_TRACING
-
namespace JSC {
ASSERT_CLASS_FITS_IN_CELL(JSObject);
+ASSERT_CLASS_FITS_IN_CELL(JSNonFinalObject);
+ASSERT_CLASS_FITS_IN_CELL(JSFinalObject);
-void JSObject::mark()
-{
- JSOBJECT_MARK_BEGIN();
+const char* StrictModeReadonlyPropertyWriteError = "Attempted to assign to readonly property.";
- JSCell::mark();
- m_structure->mark();
+const ClassInfo JSObject::s_info = { "Object", 0, 0, 0 };
- PropertyStorage storage = propertyStorage();
+static inline void getClassPropertyNames(ExecState* exec, const ClassInfo* classInfo, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+ // Add properties from the static hashtables of properties
+ for (; classInfo; classInfo = classInfo->parentClass) {
+ const HashTable* table = classInfo->propHashTable(exec);
+ if (!table)
+ continue;
+ table->initializeIfNeeded(exec);
+ ASSERT(table->table);
- size_t storageSize = m_structure->propertyStorageSize();
- for (size_t i = 0; i < storageSize; ++i) {
- JSValue v = JSValue::decode(storage[i]);
- if (!v.marked())
- v.mark();
+ int hashSizeMask = table->compactSize - 1;
+ const HashEntry* entry = table->table;
+ for (int i = 0; i <= hashSizeMask; ++i, ++entry) {
+ if (entry->key() && (!(entry->attributes() & DontEnum) || (mode == IncludeDontEnumProperties)))
+ propertyNames.add(entry->key());
+ }
}
+}
+
+void JSObject::visitChildren(SlotVisitor& visitor)
+{
+ ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+#ifndef NDEBUG
+ bool wasCheckingForDefaultMarkViolation = visitor.m_isCheckingForDefaultMarkViolation;
+ visitor.m_isCheckingForDefaultMarkViolation = false;
+#endif
- JSOBJECT_MARK_END();
+ visitChildrenDirect(visitor);
+
+#ifndef NDEBUG
+ visitor.m_isCheckingForDefaultMarkViolation = wasCheckingForDefaultMarkViolation;
+#endif
}
UString JSObject::className() const
{
const ClassInfo* info = classInfo();
- if (info)
- return info->className;
- return "Object";
+ ASSERT(info);
+ return info->className;
}
bool JSObject::getOwnPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
static void throwSetterError(ExecState* exec)
{
- throwError(exec, TypeError, "setting a property that has only a getter");
+ throwError(exec, createTypeError(exec, "setting a property that has only a getter"));
}
// ECMA 8.6.2.2
// Setting __proto__ to a non-object, non-null value is silently ignored to match Mozilla.
if (!value.isObject() && !value.isNull())
return;
-
- JSValue nextPrototypeValue = value;
- while (nextPrototypeValue && nextPrototypeValue.isObject()) {
- JSObject* nextPrototype = asObject(nextPrototypeValue)->unwrappedObject();
- if (nextPrototype == this) {
- throwError(exec, GeneralError, "cyclic __proto__ value");
- return;
- }
- nextPrototypeValue = nextPrototype->prototype();
- }
-
- setPrototype(value);
+ if (!setPrototypeWithCycleCheck(exec->globalData(), value))
+ throwError(exec, createError(exec, "cyclic __proto__ value"));
return;
}
for (JSObject* obj = this; !obj->structure()->hasGetterSetterProperties(); obj = asObject(prototype)) {
prototype = obj->prototype();
if (prototype.isNull()) {
- putDirectInternal(exec->globalData(), propertyName, value, 0, true, slot);
+ if (!putDirectInternal(exec->globalData(), propertyName, value, 0, true, slot) && slot.isStrictMode())
+ throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
return;
}
}
unsigned attributes;
JSCell* specificValue;
- if ((m_structure->get(propertyName, attributes, specificValue) != WTF::notFound) && attributes & ReadOnly)
+ if ((m_structure->get(exec->globalData(), propertyName, attributes, specificValue) != WTF::notFound) && attributes & ReadOnly) {
+ if (slot.isStrictMode())
+ throwError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
return;
+ }
for (JSObject* obj = this; ; obj = asObject(prototype)) {
- if (JSValue gs = obj->getDirect(propertyName)) {
+ if (JSValue gs = obj->getDirect(exec->globalData(), propertyName)) {
if (gs.isGetterSetter()) {
JSObject* setterFunc = asGetterSetter(gs)->setter();
if (!setterFunc) {
break;
}
- putDirectInternal(exec->globalData(), propertyName, value, 0, true, slot);
+ if (!putDirectInternal(exec->globalData(), propertyName, value, 0, true, slot) && slot.isStrictMode())
+ throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
return;
}
put(exec, Identifier::from(exec, propertyName), value, slot);
}
+void JSObject::putWithAttributes(JSGlobalData* globalData, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot)
+{
+ putDirectInternal(*globalData, propertyName, value, attributes, checkReadOnly, slot);
+}
+
+void JSObject::putWithAttributes(JSGlobalData* globalData, const Identifier& propertyName, JSValue value, unsigned attributes)
+{
+ putDirectInternal(*globalData, propertyName, value, attributes);
+}
+
+void JSObject::putWithAttributes(JSGlobalData* globalData, unsigned propertyName, JSValue value, unsigned attributes)
+{
+ putWithAttributes(globalData, Identifier::from(globalData, propertyName), value, attributes);
+}
+
void JSObject::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes, bool checkReadOnly, PutPropertySlot& slot)
{
putDirectInternal(exec->globalData(), propertyName, value, attributes, checkReadOnly, slot);
{
unsigned attributes;
JSCell* specificValue;
- if (m_structure->get(propertyName, attributes, specificValue) != WTF::notFound) {
+ if (m_structure->get(exec->globalData(), propertyName, attributes, specificValue) != WTF::notFound) {
if ((attributes & DontDelete))
return false;
- removeDirect(propertyName);
+ removeDirect(exec->globalData(), propertyName);
return true;
}
{
JSValue function = object->get(exec, propertyName);
CallData callData;
- CallType callType = function.getCallData(callData);
+ CallType callType = getCallData(function, callData);
if (callType == CallTypeNone)
return exec->exception();
ASSERT(!exec->hadException());
- return throwError(exec, TypeError, "No default value");
+ return throwError(exec, createTypeError(exec, "No default value"));
}
const HashEntry* JSObject::findPropertyHashEntry(ExecState* exec, const Identifier& propertyName) const
return 0;
}
-void JSObject::defineGetter(ExecState* exec, const Identifier& propertyName, JSObject* getterFunction)
+void JSObject::defineGetter(ExecState* exec, const Identifier& propertyName, JSObject* getterFunction, unsigned attributes)
{
- JSValue object = getDirect(propertyName);
+ JSValue object = getDirect(exec->globalData(), propertyName);
if (object && object.isGetterSetter()) {
ASSERT(m_structure->hasGetterSetterProperties());
- asGetterSetter(object)->setGetter(getterFunction);
+ asGetterSetter(object)->setGetter(exec->globalData(), getterFunction);
return;
}
+ JSGlobalData& globalData = exec->globalData();
PutPropertySlot slot;
- GetterSetter* getterSetter = new (exec) GetterSetter;
- putDirectInternal(exec->globalData(), propertyName, getterSetter, Getter, true, slot);
+ GetterSetter* getterSetter = new (exec) GetterSetter(exec);
+ putDirectInternal(globalData, propertyName, getterSetter, attributes | Getter, true, slot);
// putDirect will change our Structure if we add a new property. For
// getters and setters, though, we also need to change our Structure
// if we override an existing non-getter or non-setter.
if (slot.type() != PutPropertySlot::NewProperty) {
- if (!m_structure->isDictionary()) {
- RefPtr<Structure> structure = Structure::getterSetterTransition(m_structure);
- setStructure(structure.release());
- }
+ if (!m_structure->isDictionary())
+ setStructure(exec->globalData(), Structure::getterSetterTransition(globalData, m_structure.get()));
}
m_structure->setHasGetterSetterProperties(true);
- getterSetter->setGetter(getterFunction);
+ getterSetter->setGetter(globalData, getterFunction);
}
-void JSObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunction)
+void JSObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunction, unsigned attributes)
{
- JSValue object = getDirect(propertyName);
+ JSValue object = getDirect(exec->globalData(), propertyName);
if (object && object.isGetterSetter()) {
ASSERT(m_structure->hasGetterSetterProperties());
- asGetterSetter(object)->setSetter(setterFunction);
+ asGetterSetter(object)->setSetter(exec->globalData(), setterFunction);
return;
}
PutPropertySlot slot;
- GetterSetter* getterSetter = new (exec) GetterSetter;
- putDirectInternal(exec->globalData(), propertyName, getterSetter, Setter, true, slot);
+ GetterSetter* getterSetter = new (exec) GetterSetter(exec);
+ putDirectInternal(exec->globalData(), propertyName, getterSetter, attributes | Setter, true, slot);
// putDirect will change our Structure if we add a new property. For
// getters and setters, though, we also need to change our Structure
// if we override an existing non-getter or non-setter.
if (slot.type() != PutPropertySlot::NewProperty) {
- if (!m_structure->isDictionary()) {
- RefPtr<Structure> structure = Structure::getterSetterTransition(m_structure);
- setStructure(structure.release());
- }
+ if (!m_structure->isDictionary())
+ setStructure(exec->globalData(), Structure::getterSetterTransition(exec->globalData(), m_structure.get()));
}
m_structure->setHasGetterSetterProperties(true);
- getterSetter->setSetter(setterFunction);
+ getterSetter->setSetter(exec->globalData(), setterFunction);
}
-JSValue JSObject::lookupGetter(ExecState*, const Identifier& propertyName)
+JSValue JSObject::lookupGetter(ExecState* exec, const Identifier& propertyName)
{
JSObject* object = this;
while (true) {
- if (JSValue value = object->getDirect(propertyName)) {
+ if (JSValue value = object->getDirect(exec->globalData(), propertyName)) {
if (!value.isGetterSetter())
return jsUndefined();
JSObject* functionObject = asGetterSetter(value)->getter();
}
}
-JSValue JSObject::lookupSetter(ExecState*, const Identifier& propertyName)
+JSValue JSObject::lookupSetter(ExecState* exec, const Identifier& propertyName)
{
JSObject* object = this;
while (true) {
- if (JSValue value = object->getDirect(propertyName)) {
+ if (JSValue value = object->getDirect(exec->globalData(), propertyName)) {
if (!value.isGetterSetter())
return jsUndefined();
JSObject* functionObject = asGetterSetter(value)->setter();
return false;
if (!proto.isObject()) {
- throwError(exec, TypeError, "instanceof called on an object with an invalid prototype property.");
+ throwError(exec, createTypeError(exec, "instanceof called on an object with an invalid prototype property."));
return false;
}
bool JSObject::propertyIsEnumerable(ExecState* exec, const Identifier& propertyName) const
{
- unsigned attributes;
- if (!getPropertyAttributes(exec, propertyName, attributes))
+ PropertyDescriptor descriptor;
+ if (!const_cast<JSObject*>(this)->getOwnPropertyDescriptor(exec, propertyName, descriptor))
return false;
- return !(attributes & DontEnum);
-}
-
-bool JSObject::getPropertyAttributes(ExecState* exec, const Identifier& propertyName, unsigned& attributes) const
-{
- JSCell* specificValue;
- if (m_structure->get(propertyName, attributes, specificValue) != WTF::notFound)
- return true;
-
- // Look in the static hashtable of properties
- const HashEntry* entry = findPropertyHashEntry(exec, propertyName);
- if (entry) {
- attributes = entry->attributes();
- return true;
- }
-
- return false;
+ return descriptor.enumerable();
}
-bool JSObject::getPropertySpecificValue(ExecState*, const Identifier& propertyName, JSCell*& specificValue) const
+bool JSObject::getPropertySpecificValue(ExecState* exec, const Identifier& propertyName, JSCell*& specificValue) const
{
unsigned attributes;
- if (m_structure->get(propertyName, attributes, specificValue) != WTF::notFound)
+ if (m_structure->get(exec->globalData(), propertyName, attributes, specificValue) != WTF::notFound)
return true;
// This could be a function within the static table? - should probably
return false;
}
-void JSObject::getPropertyNames(ExecState* exec, PropertyNameArray& propertyNames)
+void JSObject::getPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
- m_structure->getEnumerablePropertyNames(exec, propertyNames, this);
+ getOwnPropertyNames(exec, propertyNames, mode);
+
+ if (prototype().isNull())
+ return;
+
+ JSObject* prototype = asObject(this->prototype());
+ while(1) {
+ if (prototype->structure()->typeInfo().overridesGetPropertyNames()) {
+ prototype->getPropertyNames(exec, propertyNames, mode);
+ break;
+ }
+ prototype->getOwnPropertyNames(exec, propertyNames, mode);
+ JSValue nextProto = prototype->prototype();
+ if (nextProto.isNull())
+ break;
+ prototype = asObject(nextProto);
+ }
+}
+
+void JSObject::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+ m_structure->getPropertyNames(exec->globalData(), propertyNames, mode);
+ getClassPropertyNames(exec, classInfo(), propertyNames, mode);
}
bool JSObject::toBoolean(ExecState*) const
return primitive.toString(exec);
}
-JSObject* JSObject::toObject(ExecState*) const
+JSObject* JSObject::toObject(ExecState*, JSGlobalObject*) const
{
return const_cast<JSObject*>(this);
}
return const_cast<JSObject*>(this);
}
+JSValue JSObject::toStrictThisObject(ExecState*) const
+{
+ return const_cast<JSObject*>(this);
+}
+
JSObject* JSObject::unwrappedObject()
{
return this;
}
-void JSObject::removeDirect(const Identifier& propertyName)
+void JSObject::seal(JSGlobalData& globalData)
+{
+ if (isSealed(globalData))
+ return;
+ preventExtensions(globalData);
+ setStructure(globalData, Structure::sealTransition(globalData, m_structure.get()));
+}
+
+void JSObject::freeze(JSGlobalData& globalData)
+{
+ if (isFrozen(globalData))
+ return;
+ preventExtensions(globalData);
+ setStructure(globalData, Structure::freezeTransition(globalData, m_structure.get()));
+}
+
+void JSObject::preventExtensions(JSGlobalData& globalData)
{
+ if (isExtensible())
+ setStructure(globalData, Structure::preventExtensionsTransition(globalData, m_structure.get()));
+}
+
+void JSObject::removeDirect(JSGlobalData& globalData, const Identifier& propertyName)
+{
+ if (m_structure->get(globalData, propertyName) == WTF::notFound)
+ return;
+
size_t offset;
if (m_structure->isUncacheableDictionary()) {
- offset = m_structure->removePropertyWithoutTransition(propertyName);
+ offset = m_structure->removePropertyWithoutTransition(globalData, propertyName);
if (offset != WTF::notFound)
- putDirectOffset(offset, jsUndefined());
+ putUndefinedAtDirectOffset(offset);
return;
}
- RefPtr<Structure> structure = Structure::removePropertyTransition(m_structure, propertyName, offset);
- setStructure(structure.release());
+ setStructure(globalData, Structure::removePropertyTransition(globalData, m_structure.get(), propertyName, offset));
if (offset != WTF::notFound)
- putDirectOffset(offset, jsUndefined());
+ putUndefinedAtDirectOffset(offset);
}
void JSObject::putDirectFunction(ExecState* exec, InternalFunction* function, unsigned attr)
{
- putDirectFunction(Identifier(exec, function->name(&exec->globalData())), function, attr);
+ putDirectFunction(exec->globalData(), Identifier(exec, function->name(exec)), function, attr);
+}
+
+void JSObject::putDirectFunction(ExecState* exec, JSFunction* function, unsigned attr)
+{
+ putDirectFunction(exec->globalData(), Identifier(exec, function->name(exec)), function, attr);
}
void JSObject::putDirectFunctionWithoutTransition(ExecState* exec, InternalFunction* function, unsigned attr)
{
- putDirectFunctionWithoutTransition(Identifier(exec, function->name(&exec->globalData())), function, attr);
+ putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, function->name(exec)), function, attr);
}
-NEVER_INLINE void JSObject::fillGetterPropertySlot(PropertySlot& slot, JSValue* location)
+void JSObject::putDirectFunctionWithoutTransition(ExecState* exec, JSFunction* function, unsigned attr)
{
- if (JSObject* getterFunction = asGetterSetter(*location)->getter())
- slot.setGetterSlot(getterFunction);
- else
+ putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, function->name(exec)), function, attr);
+}
+
+NEVER_INLINE void JSObject::fillGetterPropertySlot(PropertySlot& slot, WriteBarrierBase<Unknown>* location)
+{
+ if (JSObject* getterFunction = asGetterSetter(location->get())->getter()) {
+ if (!structure()->isDictionary())
+ slot.setCacheableGetterSlot(this, getterFunction, offsetForLocation(location));
+ else
+ slot.setGetterSlot(getterFunction);
+ } else
slot.setUndefined();
}
-Structure* JSObject::createInheritorID()
+Structure* JSObject::createInheritorID(JSGlobalData& globalData)
{
- m_inheritorID = JSObject::createStructure(this);
+ m_inheritorID.set(globalData, this, createEmptyObjectStructure(globalData, this));
+ ASSERT(m_inheritorID->isEmpty());
return m_inheritorID.get();
}
void JSObject::allocatePropertyStorage(size_t oldSize, size_t newSize)
{
- allocatePropertyStorageInline(oldSize, newSize);
+ ASSERT(newSize > oldSize);
+
+ // It's important that this function not rely on m_structure, since
+ // we might be in the middle of a transition.
+ bool wasInline = (oldSize < JSObject::baseExternalStorageCapacity);
+
+ PropertyStorage oldPropertyStorage = m_propertyStorage;
+ PropertyStorage newPropertyStorage = new WriteBarrierBase<Unknown>[newSize];
+
+ for (unsigned i = 0; i < oldSize; ++i)
+ newPropertyStorage[i] = oldPropertyStorage[i];
+
+ if (!wasInline)
+ delete [] oldPropertyStorage;
+
+ m_propertyStorage = newPropertyStorage;
+}
+
+bool JSObject::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+{
+ unsigned attributes = 0;
+ JSCell* cell = 0;
+ size_t offset = m_structure->get(exec->globalData(), propertyName, attributes, cell);
+ if (offset == WTF::notFound)
+ return false;
+ descriptor.setDescriptor(getDirectOffset(offset), attributes);
+ return true;
+}
+
+bool JSObject::getPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+{
+ JSObject* object = this;
+ while (true) {
+ if (object->getOwnPropertyDescriptor(exec, propertyName, descriptor))
+ return true;
+ JSValue prototype = object->prototype();
+ if (!prototype.isObject())
+ return false;
+ object = asObject(prototype);
+ }
+}
+
+static bool putDescriptor(ExecState* exec, JSObject* target, const Identifier& propertyName, PropertyDescriptor& descriptor, unsigned attributes, const PropertyDescriptor& oldDescriptor)
+{
+ if (descriptor.isGenericDescriptor() || descriptor.isDataDescriptor()) {
+ if (descriptor.isGenericDescriptor() && oldDescriptor.isAccessorDescriptor()) {
+ GetterSetter* accessor = new (exec) GetterSetter(exec);
+ if (oldDescriptor.getter()) {
+ attributes |= Getter;
+ accessor->setGetter(exec->globalData(), asObject(oldDescriptor.getter()));
+ }
+ if (oldDescriptor.setter()) {
+ attributes |= Setter;
+ accessor->setSetter(exec->globalData(), asObject(oldDescriptor.setter()));
+ }
+ target->putWithAttributes(exec, propertyName, accessor, attributes);
+ return true;
+ }
+ JSValue newValue = jsUndefined();
+ if (descriptor.value())
+ newValue = descriptor.value();
+ else if (oldDescriptor.value())
+ newValue = oldDescriptor.value();
+ target->putWithAttributes(exec, propertyName, newValue, attributes & ~(Getter | Setter));
+ return true;
+ }
+ attributes &= ~ReadOnly;
+ if (descriptor.getter() && descriptor.getter().isObject())
+ target->defineGetter(exec, propertyName, asObject(descriptor.getter()), attributes);
+ if (exec->hadException())
+ return false;
+ if (descriptor.setter() && descriptor.setter().isObject())
+ target->defineSetter(exec, propertyName, asObject(descriptor.setter()), attributes);
+ return !exec->hadException();
+}
+
+bool JSObject::defineOwnProperty(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor, bool throwException)
+{
+ // If we have a new property we can just put it on normally
+ PropertyDescriptor current;
+ if (!getOwnPropertyDescriptor(exec, propertyName, current)) {
+ // unless extensions are prevented!
+ if (!isExtensible()) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to define property on object that is not extensible."));
+ return false;
+ }
+ PropertyDescriptor oldDescriptor;
+ oldDescriptor.setValue(jsUndefined());
+ return putDescriptor(exec, this, propertyName, descriptor, descriptor.attributes(), oldDescriptor);
+ }
+
+ if (descriptor.isEmpty())
+ return true;
+
+ if (current.equalTo(exec, descriptor))
+ return true;
+
+ // Filter out invalid changes
+ if (!current.configurable()) {
+ if (descriptor.configurable()) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to configurable attribute of unconfigurable property."));
+ return false;
+ }
+ if (descriptor.enumerablePresent() && descriptor.enumerable() != current.enumerable()) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to change enumerable attribute of unconfigurable property."));
+ return false;
+ }
+ }
+
+ // A generic descriptor is simply changing the attributes of an existing property
+ if (descriptor.isGenericDescriptor()) {
+ if (!current.attributesEqual(descriptor)) {
+ deleteProperty(exec, propertyName);
+ putDescriptor(exec, this, propertyName, descriptor, current.attributesWithOverride(descriptor), current);
+ }
+ return true;
+ }
+
+ // Changing between a normal property or an accessor property
+ if (descriptor.isDataDescriptor() != current.isDataDescriptor()) {
+ if (!current.configurable()) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to change access mechanism for an unconfigurable property."));
+ return false;
+ }
+ deleteProperty(exec, propertyName);
+ return putDescriptor(exec, this, propertyName, descriptor, current.attributesWithOverride(descriptor), current);
+ }
+
+ // Changing the value and attributes of an existing property
+ if (descriptor.isDataDescriptor()) {
+ if (!current.configurable()) {
+ if (!current.writable() && descriptor.writable()) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to change writable attribute of unconfigurable property."));
+ return false;
+ }
+ if (!current.writable()) {
+ if (descriptor.value() || !JSValue::strictEqual(exec, current.value(), descriptor.value())) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to change value of a readonly property."));
+ return false;
+ }
+ }
+ } else if (current.attributesEqual(descriptor)) {
+ if (!descriptor.value())
+ return true;
+ PutPropertySlot slot;
+ put(exec, propertyName, descriptor.value(), slot);
+ if (exec->hadException())
+ return false;
+ return true;
+ }
+ deleteProperty(exec, propertyName);
+ return putDescriptor(exec, this, propertyName, descriptor, current.attributesWithOverride(descriptor), current);
+ }
+
+ // Changing the accessor functions of an existing accessor property
+ ASSERT(descriptor.isAccessorDescriptor());
+ if (!current.configurable()) {
+ if (descriptor.setterPresent() && !(current.setterPresent() && JSValue::strictEqual(exec, current.setter(), descriptor.setter()))) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to change the setter of an unconfigurable property."));
+ return false;
+ }
+ if (descriptor.getterPresent() && !(current.getterPresent() && JSValue::strictEqual(exec, current.getter(), descriptor.getter()))) {
+ if (throwException)
+ throwError(exec, createTypeError(exec, "Attempting to change the getter of an unconfigurable property."));
+ return false;
+ }
+ }
+ JSValue accessor = getDirect(exec->globalData(), propertyName);
+ if (!accessor)
+ return false;
+ GetterSetter* getterSetter = asGetterSetter(accessor);
+ if (current.attributesEqual(descriptor)) {
+ if (descriptor.setter())
+ getterSetter->setSetter(exec->globalData(), asObject(descriptor.setter()));
+ if (descriptor.getter())
+ getterSetter->setGetter(exec->globalData(), asObject(descriptor.getter()));
+ return true;
+ }
+ deleteProperty(exec, propertyName);
+ unsigned attrs = current.attributesWithOverride(descriptor);
+ if (descriptor.setter())
+ attrs |= Setter;
+ if (descriptor.getter())
+ attrs |= Getter;
+ putDirect(exec->globalData(), propertyName, getterSetter, attrs);
+ return true;
}
-JSObject* constructEmptyObject(ExecState* exec)
+JSObject* throwTypeError(ExecState* exec, const UString& message)
{
- return new (exec) JSObject(exec->lexicalGlobalObject()->emptyObjectStructure());
+ return throwError(exec, createTypeError(exec, message));
}
} // namespace JSC
projects / apple / javascriptcore.git / blobdiff