bool JSDOMWindow::defineOwnProperty(JSC::JSObject* object, JSC::ExecState* exec, JSC::PropertyName propertyName, const JSC::PropertyDescriptor& descriptor, bool shouldThrow)
{
    JSDOMWindow* thisObject = jsCast<JSDOMWindow*>(object);
    // Only allow defining properties in this way by frames in the same origin, as it allows setters to be introduced.
    if (!BindingSecurity::shouldAllowAccessToDOMWindow(exec, thisObject->wrapped(), ThrowSecurityError))
        return false;

    // Don't allow shadowing location using accessor properties.
    if (descriptor.isAccessorDescriptor() && propertyName == Identifier::fromString(exec, "location"))
        return false;

    return Base::defineOwnProperty(thisObject, exec, propertyName, descriptor, shouldThrow);
}
bool JSCSSStyleDeclaration::getOwnPropertyDescriptorDelegate(JSC::ExecState* exec, JSC::PropertyName propertyIdentifier, JSC::PropertyDescriptor& descriptor)
{
    CSSPropertyInfo propertyInfo = cssPropertyIDForJSCSSPropertyName(propertyIdentifier);
    if (!propertyInfo.propertyID)
        return false;

    JSValue value;
    if (propertyInfo.hadPixelOrPosPrefix)
        value = cssPropertyGetterPixelOrPosPrefix(exec, this, propertyInfo.propertyID);
    else
        value = cssPropertyGetter(exec, this, propertyInfo.propertyID);
    descriptor.setDescriptor(value, ReadOnly | DontDelete | DontEnum);
    return true;
}
bool GlobalObject::getOwnPropertyDescriptor(JSC::ExecState* exec,
                                            const JSC::Identifier& propertyName,
                                            JSC::PropertyDescriptor& descriptor)
{
    // Must match the logic of getOwnPropertySlot().
    QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
    if (propertyName == exec->propertyNames().arguments && engine->currentFrame->argumentCount() > 0) {
        // ### Can we get rid of this special handling of the arguments property?
        JSC::JSValue args = engine->scriptValueToJSCValue(engine->contextForFrame(engine->currentFrame)->argumentsObject());
        descriptor.setValue(args);
        return true;
    }
    if (customGlobalObject)
        return customGlobalObject->getOwnPropertyDescriptor(exec, propertyName, descriptor);
    return JSC::JSGlobalObject::getOwnPropertyDescriptor(exec, propertyName, descriptor);
}
bool ClassObjectDelegate::getOwnPropertyDescriptor(QScriptObject *object,
                                                   JSC::ExecState *exec,
                                                   const JSC::Identifier &propertyName,
                                                   JSC::PropertyDescriptor &descriptor)
{
    QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
    QScript::SaveFrameHelper saveFrame(engine, exec);
    // for compatibility with the old back-end, normal JS properties
    // are queried first.
    if (QScriptObjectDelegate::getOwnPropertyDescriptor(object, exec, propertyName, descriptor))
        return true;

    QScriptValue scriptObject = engine->scriptValueFromJSCValue(object);
    QScriptString scriptName;
    QScriptStringPrivate scriptName_d(engine, propertyName, QScriptStringPrivate::StackAllocated);
    QScriptStringPrivate::init(scriptName, &scriptName_d);
    uint id = 0;
    QScriptClass::QueryFlags qflags = m_scriptClass->queryProperty(
        scriptObject, scriptName, QScriptClass::HandlesReadAccess, &id);
    if (qflags & QScriptClass::HandlesReadAccess) {
        QScriptValue::PropertyFlags pflags = m_scriptClass->propertyFlags(scriptObject, scriptName, id);
        unsigned attribs = 0;
        if (pflags & QScriptValue::ReadOnly)
            attribs |= JSC::ReadOnly;
        if (pflags & QScriptValue::SkipInEnumeration)
            attribs |= JSC::DontEnum;
        if (pflags & QScriptValue::Undeletable)
            attribs |= JSC::DontDelete;
        if (pflags & QScriptValue::PropertyGetter)
            attribs |= JSC::Getter;
        if (pflags & QScriptValue::PropertySetter)
            attribs |= JSC::Setter;
        attribs |= pflags & QScriptValue::UserRange;
        // Rather than calling the getter, we could return an access descriptor here.
        QScriptValue value = m_scriptClass->property(scriptObject, scriptName, id);
        if (!value.isValid()) {
            // The class claims to have the property, but returned an invalid
            // value. Silently convert to undefined to avoid the invalid value
            // "escaping" into JS.
            value = QScriptValue(QScriptValue::UndefinedValue);
        }
        descriptor.setDescriptor(engine->scriptValueToJSCValue(value), attribs);
        return true;
    }
    return false;
}