Merge branch '4.7' of scm.dev.nokia.troll.no:qt/qt into 4.7

Conflicts:
	configure.exe
	src/declarative/util/qdeclarativelistmodel.cpp
	tools/qml/qml.pro

24 files changed, 318 insertions, 371 deletions

diff --git a/src/script/api/qscriptcontextinfo.cpp b/src/script/api/qscriptcontextinfo.cpp
index cc5fcc1..ebb1770 100644
--- a/src/script/api/qscriptcontextinfo.cpp
+++ b/src/script/api/qscriptcontextinfo.cpp
@@ -181,7 +181,7 @@ QScriptContextInfoPrivate::QScriptContextInfoPrivate(const QScriptContext *conte
     // Get the others informations:
     JSC::JSObject *callee = frame->callee();
     if (callee && callee->inherits(&JSC::InternalFunction::info))
-        functionName = JSC::asInternalFunction(callee)->name(&frame->globalData());
+        functionName = JSC::asInternalFunction(callee)->name(frame);
     if (callee && callee->inherits(&JSC::JSFunction::info)) {
         functionType = QScriptContextInfo::ScriptFunction;
         JSC::FunctionExecutable *body = JSC::asFunction(callee)->jsExecutable();
diff --git a/src/script/api/qscriptengine.cpp b/src/script/api/qscriptengine.cpp
index 024b4d0..294c3a0 100644
--- a/src/script/api/qscriptengine.cpp
+++ b/src/script/api/qscriptengine.cpp
@@ -898,6 +898,8 @@ QScriptEnginePrivate::QScriptEnginePrivate()
 
 QScriptEnginePrivate::~QScriptEnginePrivate()
 {
+    JSC::setCurrentIdentifierTable(globalData->identifierTable);
+
     //disconnect all loadedScripts and generate all jsc::debugger::scriptUnload events
     QHash<intptr_t,QScript::UStringSourceProviderWithFeedback*>::const_iterator it;
     for (it = loadedScripts.constBegin(); it != loadedScripts.constEnd(); ++it)
@@ -988,8 +990,7 @@ JSC::JSValue QScriptEnginePrivate::objectFromVariantMap(JSC::ExecState *exec, co
 QVariantMap QScriptEnginePrivate::variantMapFromObject(JSC::ExecState *exec, JSC::JSValue obj)
 {
     JSC::PropertyNameArray propertyNames(exec);
-    propertyNames.setShouldCache(false);
-    JSC::asObject(obj)->getOwnPropertyNames(exec, propertyNames, /*includeNonEnumerable=*/true);
+    JSC::asObject(obj)->getOwnPropertyNames(exec, propertyNames, JSC::IncludeDontEnumProperties);
     QVariantMap vmap;
     JSC::PropertyNameArray::const_iterator it = propertyNames.begin();
     for( ; it != propertyNames.end(); ++it)
@@ -1187,7 +1188,8 @@ bool QScriptEnginePrivate::isCollecting() const
 void QScriptEnginePrivate::collectGarbage()
 {
     JSC::JSLock lock(false);
-    globalData->heap.collect();
+    QScript::APIShim shim(this);
+    globalData->heap.collectAllGarbage();
 }
 
 QScript::TimeoutCheckerProxy *QScriptEnginePrivate::timeoutChecker() const
@@ -1218,7 +1220,7 @@ JSC::JSValue QScriptEnginePrivate::evaluateHelper(JSC::ExecState *exec, intptr_t
         debugger->evaluateStart(sourceId);
 
     q->clearExceptions();
-    JSC::DynamicGlobalObjectScope dynamicGlobalObjectScope(exec, exec->scopeChain()->globalObject());
+    JSC::DynamicGlobalObjectScope dynamicGlobalObjectScope(exec, exec->scopeChain()->globalObject);
 
     if (compile) {
         JSC::JSObject* error = executable->compile(exec, exec->scopeChain());
@@ -1670,15 +1672,15 @@ void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue object
             // deleting getter/setter
             if ((flags & QScriptValue::PropertyGetter) && (flags & QScriptValue::PropertySetter)) {
                 // deleting both: just delete the property
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+                thisObject->deleteProperty(exec, id);
             } else if (flags & QScriptValue::PropertyGetter) {
                 // preserve setter, if there is one
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+                thisObject->deleteProperty(exec, id);
                 if (setter && setter.isObject())
                     thisObject->defineSetter(exec, id, JSC::asObject(setter));
             } else { // flags & QScriptValue::PropertySetter
                 // preserve getter, if there is one
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+                thisObject->deleteProperty(exec, id);
                 if (getter && getter.isObject())
                     thisObject->defineGetter(exec, id, JSC::asObject(getter));
             }
@@ -1708,10 +1710,10 @@ void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue object
         }
         if (!value) {
             // ### check if it's a getter/setter property
-            thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+            thisObject->deleteProperty(exec, id);
         } else if (flags != QScriptValue::KeepExistingFlags) {
             if (thisObject->hasOwnProperty(exec, id))
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false); // ### hmmm - can't we just update the attributes?
+                thisObject->deleteProperty(exec, id); // ### hmmm - can't we just update the attributes?
             unsigned attribs = 0;
             if (flags & QScriptValue::ReadOnly)
                 attribs |= JSC::ReadOnly;
@@ -1732,7 +1734,7 @@ void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue object
                                        JSC::JSValue value, const QScriptValue::PropertyFlags &flags)
 {
     if (!value) {
-        JSC::asObject(objectValue)->deleteProperty(exec, index, /*checkDontDelete=*/false);
+        JSC::asObject(objectValue)->deleteProperty(exec, index);
     } else {
         if ((flags & QScriptValue::PropertyGetter) || (flags & QScriptValue::PropertySetter)) {
             // fall back to string-based setProperty(), since there is no
@@ -1766,7 +1768,7 @@ QScriptValue::PropertyFlags QScriptEnginePrivate::propertyFlags(JSC::ExecState *
     JSC::PropertyDescriptor descriptor;
     if (object->getOwnPropertyDescriptor(exec, id, descriptor))
         attribs = descriptor.attributes();
-    else if (!object->getPropertyAttributes(exec, id, attribs)) {
+    else {
         if ((mode & QScriptValue::ResolvePrototype) && object->prototype() && object->prototype().isObject()) {
             JSC::JSValue proto = object->prototype();
             return propertyFlags(exec, proto, id, mode);
@@ -1793,6 +1795,15 @@ QScriptValue::PropertyFlags QScriptEnginePrivate::propertyFlags(JSC::ExecState *
     return result;
 }
 
+QScriptString QScriptEnginePrivate::toStringHandle(const JSC::Identifier &name)
+{
+    QScriptString result;
+    QScriptStringPrivate *p = new QScriptStringPrivate(this, name, QScriptStringPrivate::HeapAllocated);
+    QScriptStringPrivate::init(result, p);
+    registerScriptString(p);
+    return result;
+}
+
 #ifdef QT_NO_QOBJECT
 
 QScriptEngine::QScriptEngine()
@@ -2466,15 +2477,16 @@ QScriptSyntaxCheckResult QScriptEnginePrivate::checkSyntax(const QString &progra
 QScriptValue QScriptEngine::evaluate(const QString &program, const QString &fileName, int lineNumber)
 {
     Q_D(QScriptEngine);
+    QScript::APIShim shim(d);
     WTF::PassRefPtr<QScript::UStringSourceProviderWithFeedback> provider
             = QScript::UStringSourceProviderWithFeedback::create(program, fileName, lineNumber, d);
     intptr_t sourceId = provider->asID();
     JSC::SourceCode source(provider, lineNumber); //after construction of SourceCode provider variable will be null.
 
     JSC::ExecState* exec = d->currentFrame;
-    JSC::EvalExecutable executable(exec, source);
+    WTF::RefPtr<JSC::EvalExecutable> executable = JSC::EvalExecutable::create(exec, source);
     bool compile = true;
-    return d->scriptValueFromJSCValue(d->evaluateHelper(exec, sourceId, &executable, compile));
+    return d->scriptValueFromJSCValue(d->evaluateHelper(exec, sourceId, executable.get(), compile));
 }
 
 /*!
@@ -2491,6 +2503,7 @@ QScriptValue QScriptEngine::evaluate(const QScriptProgram &program)
     if (!program_d)
         return QScriptValue();
 
+    QScript::APIShim shim(d);
     JSC::ExecState* exec = d->currentFrame;
     JSC::EvalExecutable *executable = program_d->executable(exec, d);
     bool compile = !program_d->isCompiled;
@@ -2603,7 +2616,7 @@ JSC::CallFrame *QScriptEnginePrivate::pushContext(JSC::CallFrame *exec, JSC::JSV
             newCallFrame->init(0, /*vPC=*/0, exec->scopeChain(), exec, flags | ShouldRestoreCallFrame, argc, callee);
         } else {
             JSC::JSObject *jscObject = originalGlobalObject();
-            JSC::ScopeChainNode *scn = new JSC::ScopeChainNode(0, jscObject, &exec->globalData(), jscObject);
+            JSC::ScopeChainNode *scn = new JSC::ScopeChainNode(0, jscObject, &exec->globalData(), exec->lexicalGlobalObject(), jscObject);
             newCallFrame->init(0, /*vPC=*/0, scn, exec, flags | ShouldRestoreCallFrame, argc, callee);
         }
     } else {
@@ -2935,7 +2948,7 @@ JSC::JSValue QScriptEnginePrivate::create(JSC::ExecState *exec, int type, const
         }
     }
     if (result && result.isObject() && info && info->prototype
-        && JSC::JSValue::strictEqual(JSC::asObject(result)->prototype(), eng->originalGlobalObject()->objectPrototype())) {
+        && JSC::JSValue::strictEqual(exec, JSC::asObject(result)->prototype(), eng->originalGlobalObject()->objectPrototype())) {
         JSC::asObject(result)->setPrototype(info->prototype);
     }
     return result;
@@ -4050,11 +4063,8 @@ QScriptEngineAgent *QScriptEngine::agent() const
 QScriptString QScriptEngine::toStringHandle(const QString &str)
 {
     Q_D(QScriptEngine);
-    QScriptString result;
-    QScriptStringPrivate *p = new QScriptStringPrivate(d, JSC::Identifier(d->currentFrame, str), QScriptStringPrivate::HeapAllocated);
-    QScriptStringPrivate::init(result, p);
-    d->registerScriptString(p);
-    return result;
+    QScript::APIShim shim(d);
+    return d->toStringHandle(JSC::Identifier(d->currentFrame, str));
 }
 
 /*!
diff --git a/src/script/api/qscriptengine_p.h b/src/script/api/qscriptengine_p.h
index 5166d89..47e5d8a 100644
--- a/src/script/api/qscriptengine_p.h
+++ b/src/script/api/qscriptengine_p.h
@@ -279,6 +279,7 @@ public:
     inline void registerScriptString(QScriptStringPrivate *value);
     inline void unregisterScriptString(QScriptStringPrivate *value);
     void detachAllRegisteredScriptStrings();
+    QScriptString toStringHandle(const JSC::Identifier &name);
 
     static inline JSC::JSValue newArray(JSC::ExecState *, uint length);
     static inline JSC::JSValue newDate(JSC::ExecState *, qsreal value);
@@ -383,6 +384,23 @@ public:
 namespace QScript
 {
 
+class APIShim
+{
+public:
+    APIShim(QScriptEnginePrivate *engine)
+        : m_engine(engine), m_oldTable(JSC::setCurrentIdentifierTable(engine->globalData->identifierTable))
+    {
+    }
+    ~APIShim()
+    {
+        JSC::setCurrentIdentifierTable(m_oldTable);
+    }
+
+private:
+    QScriptEnginePrivate *m_engine;
+    JSC::IdentifierTable *m_oldTable;
+};
+
 /*Helper class. Main purpose is to give debugger feedback about unloading and loading scripts.
   It keeps pointer to JSGlobalObject assuming that it is always the same - there is no way to update
   this data. Class is internal and used as an implementation detail in and only in QScriptEngine::evaluate.*/
@@ -685,17 +703,17 @@ inline void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue
     setProperty(exec, objectValue, JSC::Identifier(exec, name), value, flags);
 }
 
-inline JSC::JSValue QScriptValuePrivate::property(const JSC::Identifier &id, int resolveMode) const
+inline JSC::JSValue QScriptValuePrivate::property(const JSC::Identifier &id, const QScriptValue::ResolveFlags &resolveMode) const
 {
     return QScriptEnginePrivate::property(engine->currentFrame, jscValue, id, resolveMode);
 }
 
-inline JSC::JSValue QScriptValuePrivate::property(quint32 index, int resolveMode) const
+inline JSC::JSValue QScriptValuePrivate::property(quint32 index, const QScriptValue::ResolveFlags &resolveMode) const
 {
     return QScriptEnginePrivate::property(engine->currentFrame, jscValue, index, resolveMode);
 }
 
-inline JSC::JSValue QScriptValuePrivate::property(const JSC::UString &name, int resolveMode) const
+inline JSC::JSValue QScriptValuePrivate::property(const JSC::UString &name, const QScriptValue::ResolveFlags &resolveMode) const
 {
     JSC::ExecState *exec = engine->currentFrame;
     return QScriptEnginePrivate::property(exec, jscValue, JSC::Identifier(exec, name), resolveMode);
@@ -779,6 +797,7 @@ inline void QScriptEnginePrivate::unregisterScriptString(QScriptStringPrivate *v
         registeredScriptStrings = value->next;
     value->prev = 0;
     value->next = 0;
+    JSC::setCurrentIdentifierTable(globalData->identifierTable);
 }
 
 inline QScriptContext *QScriptEnginePrivate::contextForFrame(JSC::ExecState *frame)
diff --git a/src/script/api/qscriptengineagent.cpp b/src/script/api/qscriptengineagent.cpp
index 3bd97eb..28905e8 100644
--- a/src/script/api/qscriptengineagent.cpp
+++ b/src/script/api/qscriptengineagent.cpp
@@ -151,14 +151,15 @@ void QScriptEngineAgentPrivate::exceptionCatch(const JSC::DebuggerCallFrame& fra
     engine->clearCurrentException();
 }
 
-void QScriptEngineAgentPrivate::atStatement(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno, int column)
+void QScriptEngineAgentPrivate::atStatement(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno/*, int column*/)
 {
     QScript::UStringSourceProviderWithFeedback *source = engine->loadedScripts.value(sourceID);
     if (!source) {
         // QTBUG-6108: We don't have the source for this script, so ignore.
         return;
     }
-    column = source->columnNumberFromOffset(column);
+//    column = source->columnNumberFromOffset(column);
+    int column = 1;
     JSC::CallFrame *oldFrame = engine->currentFrame;
     int oldAgentLineNumber = engine->agentLineNumber;
     engine->currentFrame = frame.callFrame();
@@ -182,7 +183,7 @@ void QScriptEngineAgentPrivate::evaluateStop(const JSC::JSValue& returnValue, in
 }
 
 void QScriptEngineAgentPrivate::didReachBreakpoint(const JSC::DebuggerCallFrame& frame,
-                                                   intptr_t sourceID, int lineno, int column)
+                                                   intptr_t sourceID, int lineno/*, int column*/)
 {
     if (q_ptr->supportsExtension(QScriptEngineAgent::DebuggerInvocationRequest)) {
         QScript::UStringSourceProviderWithFeedback *source = engine->loadedScripts.value(sourceID);
@@ -190,7 +191,8 @@ void QScriptEngineAgentPrivate::didReachBreakpoint(const JSC::DebuggerCallFrame&
             // QTBUG-6108: We don't have the source for this script, so ignore.
             return;
         }
-        column = source->columnNumberFromOffset(column);
+//        column = source->columnNumberFromOffset(column);
+        int column = 1;
         JSC::CallFrame *oldFrame = engine->currentFrame;
         int oldAgentLineNumber = engine->agentLineNumber;
         engine->currentFrame = frame.callFrame();
diff --git a/src/script/api/qscriptengineagent_p.h b/src/script/api/qscriptengineagent_p.h
index 8354143..fd10e68 100644
--- a/src/script/api/qscriptengineagent_p.h
+++ b/src/script/api/qscriptengineagent_p.h
@@ -75,17 +75,18 @@ public:
     };
 
     //exceptions
-    virtual void exception(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno)
+    virtual void exception(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno, bool hasHandler)
     {
         Q_UNUSED(frame);
         Q_UNUSED(sourceID);
         Q_UNUSED(lineno);
+        Q_UNUSED(hasHandler);
     };
     virtual void exceptionThrow(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, bool hasHandler);
     virtual void exceptionCatch(const JSC::DebuggerCallFrame& frame, intptr_t sourceID);
 
     //statements
-    virtual void atStatement(const JSC::DebuggerCallFrame&, intptr_t sourceID, int lineno, int column);
+    virtual void atStatement(const JSC::DebuggerCallFrame&, intptr_t sourceID, int lineno/*, int column*/);
     virtual void callEvent(const JSC::DebuggerCallFrame&, intptr_t sourceID, int lineno)
     {
         Q_UNUSED(lineno);
@@ -107,7 +108,7 @@ public:
     };
     virtual void functionExit(const JSC::JSValue& returnValue, intptr_t sourceID);
     //others
-    virtual void didReachBreakpoint(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno, int column);
+    virtual void didReachBreakpoint(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno/*, int column*/);
 
     virtual void evaluateStart(intptr_t sourceID)
     {
diff --git a/src/script/api/qscriptvalue.cpp b/src/script/api/qscriptvalue.cpp
index 414a45c..a3af2d4 100644
--- a/src/script/api/qscriptvalue.cpp
+++ b/src/script/api/qscriptvalue.cpp
@@ -898,18 +898,21 @@ bool QScriptValue::strictlyEquals(const QScriptValue &other) const
         if (d->type == QScriptValuePrivate::JavaScriptCore) {
             QScriptEnginePrivate *eng_p = d->engine ? d->engine : other.d_ptr->engine;
             if (eng_p)
-                return JSC::JSValue::strictEqual(d->jscValue, eng_p->scriptValueToJSCValue(other));
+                return JSC::JSValue::strictEqual(eng_p->currentFrame, d->jscValue, eng_p->scriptValueToJSCValue(other));
         } else if (other.d_ptr->type == QScriptValuePrivate::JavaScriptCore) {
             QScriptEnginePrivate *eng_p = other.d_ptr->engine ? other.d_ptr->engine : d->engine;
             if (eng_p)
-                return JSC::JSValue::strictEqual(eng_p->scriptValueToJSCValue(*this), other.d_ptr->jscValue);
+                return JSC::JSValue::strictEqual(eng_p->currentFrame, eng_p->scriptValueToJSCValue(*this), other.d_ptr->jscValue);
         }
 
         return false;
     }
     switch (d->type) {
-    case QScriptValuePrivate::JavaScriptCore:
-        return JSC::JSValue::strictEqual(d->jscValue, other.d_ptr->jscValue);
+    case QScriptValuePrivate::JavaScriptCore: {
+        QScriptEnginePrivate *eng_p = d->engine ? d->engine : other.d_ptr->engine;
+        JSC::ExecState *exec = eng_p ? eng_p->currentFrame : 0;
+        return JSC::JSValue::strictEqual(exec, d->jscValue, other.d_ptr->jscValue);
+    }
     case QScriptValuePrivate::Number:
         return (d->numberValue == other.d_ptr->numberValue);
     case QScriptValuePrivate::String:
@@ -1301,6 +1304,7 @@ void QScriptValue::setProperty(const QString &name, const QScriptValue &value,
     Q_D(QScriptValue);
     if (!d || !d->isObject())
         return;
+    QScript::APIShim shim(d->engine);
     QScriptEnginePrivate *valueEngine = QScriptValuePrivate::getEngine(value);
     if (valueEngine && (valueEngine != d->engine)) {
         qWarning("QScriptValue::setProperty(%s) failed: "
@@ -1333,6 +1337,7 @@ QScriptValue QScriptValue::property(const QString &name,
     Q_D(const QScriptValue);
     if (!d || !d->isObject())
         return QScriptValue();
+    QScript::APIShim shim(d->engine);
     return d->engine->scriptValueFromJSCValue(d->property(name, mode));
 }
 
@@ -1450,6 +1455,7 @@ QScriptValue::PropertyFlags QScriptValue::propertyFlags(const QString &name,
     Q_D(const QScriptValue);
     if (!d || !d->isObject())
         return 0;
+    QScript::APIShim shim(d->engine);
     JSC::ExecState *exec = d->engine->currentFrame;
     return d->propertyFlags(JSC::Identifier(exec, name), mode);
 
diff --git a/src/script/api/qscriptvalue_p.h b/src/script/api/qscriptvalue_p.h
index 089b923..853c6c8 100644
--- a/src/script/api/qscriptvalue_p.h
+++ b/src/script/api/qscriptvalue_p.h
@@ -86,17 +86,18 @@ public:
         return q.d_ptr->engine;
     }
 
-    inline JSC::JSValue property(const JSC::Identifier &id, int resolveMode) const;
-    inline JSC::JSValue property(quint32 index, int resolveMode) const;
-    inline JSC::JSValue property(const JSC::UString &, int resolveMode) const;
+    inline JSC::JSValue property(const JSC::Identifier &id,
+                                 const QScriptValue::ResolveFlags &mode = QScriptValue::ResolvePrototype) const;
+    inline JSC::JSValue property(quint32 index, const QScriptValue::ResolveFlags &mode = QScriptValue::ResolvePrototype) const;
+    inline JSC::JSValue property(const JSC::UString &, const QScriptValue::ResolveFlags &mode = QScriptValue::ResolvePrototype) const;
     inline void setProperty(const JSC::UString &name, const JSC::JSValue &value,
-                            const QScriptValue::PropertyFlags &flags);
+                            const QScriptValue::PropertyFlags &flags = QScriptValue::KeepExistingFlags);
     inline void setProperty(const JSC::Identifier &id, const JSC::JSValue &value,
-                            const QScriptValue::PropertyFlags &flags);
+                            const QScriptValue::PropertyFlags &flags = QScriptValue::KeepExistingFlags);
     inline void setProperty(quint32 index, const JSC::JSValue &value,
-                            const QScriptValue::PropertyFlags &flags);
+                            const QScriptValue::PropertyFlags &flags = QScriptValue::KeepExistingFlags);
     inline QScriptValue::PropertyFlags propertyFlags(
-        const JSC::Identifier &id, const QScriptValue::ResolveFlags &mode) const;
+        const JSC::Identifier &id, const QScriptValue::ResolveFlags &mode = QScriptValue::ResolvePrototype) const;
 
     void detachFromEngine();
 
diff --git a/src/script/api/qscriptvalueiterator.cpp b/src/script/api/qscriptvalueiterator.cpp
index 24d9754..5c1e6f2 100644
--- a/src/script/api/qscriptvalueiterator.cpp
+++ b/src/script/api/qscriptvalueiterator.cpp
@@ -84,28 +84,38 @@ public:
     QScriptValueIteratorPrivate()
         : initialized(false)
     {}
+
+    QScriptValuePrivate *object() const
+    {
+        return QScriptValuePrivate::get(objectValue);
+    }
+
+    QScriptEnginePrivate *engine() const
+    {
+        return QScriptEnginePrivate::get(objectValue.engine());
+    }
+
     void ensureInitialized()
     {
         if (initialized)
             return;
-        QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(object.engine());
+        QScriptEnginePrivate *eng_p = engine();
         JSC::ExecState *exec = eng_p->globalExec();
         JSC::PropertyNameArray propertyNamesArray(exec);
-        propertyNamesArray.setShouldCache(false);
-        JSC::asObject(QScriptValuePrivate::get(object)->jscValue)->getOwnPropertyNames(exec, propertyNamesArray, /*includeNonEnumerable=*/true);
+        JSC::asObject(object()->jscValue)->getOwnPropertyNames(exec, propertyNamesArray, JSC::IncludeDontEnumProperties);
 
         JSC::PropertyNameArray::const_iterator propertyNamesIt = propertyNamesArray.begin();
         for(; propertyNamesIt != propertyNamesArray.end(); ++propertyNamesIt) {
-            propertyNames.append(propertyNamesIt->ustring());
+            propertyNames.append(*propertyNamesIt);
         }
         it = propertyNames.begin();
         initialized = true;
     }
 
-    QScriptValue object;
-    QLinkedList<JSC::UString> propertyNames;
-    QLinkedList<JSC::UString>::iterator it;
-    QLinkedList<JSC::UString>::iterator current;
+    QScriptValue objectValue;
+    QLinkedList<JSC::Identifier> propertyNames;
+    QLinkedList<JSC::Identifier>::iterator it;
+    QLinkedList<JSC::Identifier>::iterator current;
     bool initialized;
 };
 
@@ -119,7 +129,7 @@ QScriptValueIterator::QScriptValueIterator(const QScriptValue &object)
 {
     if (object.isObject()) {
         d_ptr.reset(new QScriptValueIteratorPrivate());
-        d_ptr->object = object;
+        d_ptr->objectValue = object;
     }
 }
 
@@ -240,9 +250,9 @@ void QScriptValueIterator::toBack()
 QString QScriptValueIterator::name() const
 {
     Q_D(const QScriptValueIterator);
-    if (!d || !d->initialized)
+    if (!d || !d->initialized || !d->engine())
         return QString();
-    return *d->current;
+    return d->current->ustring();
 }
 
 /*!
@@ -254,9 +264,9 @@ QString QScriptValueIterator::name() const
 QScriptString QScriptValueIterator::scriptName() const
 {
     Q_D(const QScriptValueIterator);
-    if (!d || !d->initialized)
+    if (!d || !d->initialized || !d->engine())
         return QScriptString();
-    return d->object.engine()->toStringHandle(name());
+    return d->engine()->toStringHandle(*d->current);
 }
 
 /*!
@@ -268,9 +278,10 @@ QScriptString QScriptValueIterator::scriptName() const
 QScriptValue QScriptValueIterator::value() const
 {
     Q_D(const QScriptValueIterator);
-    if (!d || !d->initialized)
+    if (!d || !d->initialized || !d->engine())
         return QScriptValue();
-    return d->object.property(name());
+    JSC::JSValue jsValue = d->object()->property(*d->current);
+    return d->engine()->scriptValueFromJSCValue(jsValue);
 }
 
 /*!
@@ -282,9 +293,10 @@ QScriptValue QScriptValueIterator::value() const
 void QScriptValueIterator::setValue(const QScriptValue &value)
 {
     Q_D(QScriptValueIterator);
-    if (!d || !d->initialized)
+    if (!d || !d->initialized || !d->engine())
         return;
-    d->object.setProperty(name(), value);
+    JSC::JSValue jsValue = d->engine()->scriptValueToJSCValue(value);
+    d->object()->setProperty(*d->current, jsValue);
 }
 
 /*!
@@ -296,9 +308,9 @@ void QScriptValueIterator::setValue(const QScriptValue &value)
 QScriptValue::PropertyFlags QScriptValueIterator::flags() const
 {
     Q_D(const QScriptValueIterator);
-    if (!d || !d->initialized)
+    if (!d || !d->initialized || !d->engine())
         return 0;
-    return d->object.propertyFlags(name());
+    return d->object()->propertyFlags(*d->current);
 }
 
 /*!
@@ -310,9 +322,9 @@ QScriptValue::PropertyFlags QScriptValueIterator::flags() const
 void QScriptValueIterator::remove()
 {
     Q_D(QScriptValueIterator);
-    if (!d || !d->initialized)
+    if (!d || !d->initialized || !d->engine())
         return;
-    d->object.setProperty(name(), QScriptValue());
+    d->object()->setProperty(*d->current, JSC::JSValue());
     d->propertyNames.erase(d->current);
 }
 
@@ -326,7 +338,7 @@ QScriptValueIterator& QScriptValueIterator::operator=(QScriptValue &object)
     d_ptr.reset();
     if (object.isObject()) {
         d_ptr.reset(new QScriptValueIteratorPrivate());
-        d_ptr->object = object;
+        d_ptr->objectValue = object;
     }
     return *this;
 }
diff --git a/src/script/bridge/qscriptactivationobject.cpp b/src/script/bridge/qscriptactivationobject.cpp
index 7189f2e..6a8ae56 100644
--- a/src/script/bridge/qscriptactivationobject.cpp
+++ b/src/script/bridge/qscriptactivationobject.cpp
@@ -63,20 +63,20 @@ bool QScriptActivationObject::getOwnPropertySlot(JSC::ExecState* exec, const JSC
     return JSC::JSVariableObject::getOwnPropertySlot(exec, propertyName, slot);
 }
 
-bool QScriptActivationObject::getPropertyAttributes(JSC::ExecState* exec, const JSC::Identifier& propertyName, unsigned& attributes) const
+bool QScriptActivationObject::getOwnPropertyDescriptor(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::PropertyDescriptor& descriptor)
 {
     if (d_ptr()->delegate != 0)
-        return d_ptr()->delegate->getPropertyAttributes(exec, propertyName, attributes);
-    return JSC::JSVariableObject::getPropertyAttributes(exec, propertyName, attributes);
+        return d_ptr()->delegate->getOwnPropertyDescriptor(exec, propertyName, descriptor);
+    return JSC::JSVariableObject::getOwnPropertyDescriptor(exec, propertyName, descriptor);
 }
 
-void QScriptActivationObject::getOwnPropertyNames(JSC::ExecState* exec, JSC::PropertyNameArray& propertyNames, bool includeNonEnumerable)
+void QScriptActivationObject::getOwnPropertyNames(JSC::ExecState* exec, JSC::PropertyNameArray& propertyNames, JSC::EnumerationMode mode)
 {
     if (d_ptr()->delegate != 0) {
-        d_ptr()->delegate->getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+        d_ptr()->delegate->getOwnPropertyNames(exec, propertyNames, mode);
         return;
     }
-    return JSC::JSVariableObject::getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+    return JSC::JSVariableObject::getOwnPropertyNames(exec, propertyNames, mode);
 }
 
 void QScriptActivationObject::putWithAttributes(JSC::ExecState *exec, const JSC::Identifier &propertyName, JSC::JSValue value, unsigned attributes)
@@ -111,11 +111,11 @@ void QScriptActivationObject::put(JSC::ExecState* exec, unsigned propertyName, J
     JSC::JSVariableObject::put(exec, propertyName, value);
 }
 
-bool QScriptActivationObject::deleteProperty(JSC::ExecState* exec, const JSC::Identifier& propertyName, bool checkDontDelete)
+bool QScriptActivationObject::deleteProperty(JSC::ExecState* exec, const JSC::Identifier& propertyName)
 {
     if (d_ptr()->delegate != 0)
-        return d_ptr()->delegate->deleteProperty(exec, propertyName, checkDontDelete);
-    return JSC::JSVariableObject::deleteProperty(exec, propertyName, checkDontDelete);
+        return d_ptr()->delegate->deleteProperty(exec, propertyName);
+    return JSC::JSVariableObject::deleteProperty(exec, propertyName);
 }
 
 void QScriptActivationObject::defineGetter(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::JSObject* getterFunction)
diff --git a/src/script/bridge/qscriptactivationobject_p.h b/src/script/bridge/qscriptactivationobject_p.h
index 7648a26..72ea11f 100644
--- a/src/script/bridge/qscriptactivationobject_p.h
+++ b/src/script/bridge/qscriptactivationobject_p.h
@@ -51,14 +51,14 @@ public:
     virtual bool isDynamicScope() const { return true; }
 
     virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&);
-    virtual bool getPropertyAttributes(JSC::ExecState*, const JSC::Identifier&, unsigned&) const;
-    virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&, bool includeNonEnumerable = false);
+    virtual bool getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertyDescriptor&);
+    virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&, JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
 
     virtual void putWithAttributes(JSC::ExecState *exec, const JSC::Identifier &propertyName, JSC::JSValue value, unsigned attributes);
     virtual void put(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSValue value, JSC::PutPropertySlot&);
     virtual void put(JSC::ExecState*, unsigned propertyName, JSC::JSValue value);
 
-    virtual bool deleteProperty(JSC::ExecState*, const JSC::Identifier& propertyName, bool checkDontDelete = true);
+    virtual bool deleteProperty(JSC::ExecState*, const JSC::Identifier& propertyName);
 
     virtual void defineGetter(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSObject* getterFunction);
     virtual void defineSetter(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSObject* setterFunction);
diff --git a/src/script/bridge/qscriptclassobject.cpp b/src/script/bridge/qscriptclassobject.cpp
index ce0a08e..a7b5f48 100644
--- a/src/script/bridge/qscriptclassobject.cpp
+++ b/src/script/bridge/qscriptclassobject.cpp
@@ -84,6 +84,47 @@ bool ClassObjectDelegate::getOwnPropertySlot(QScriptObject* object,
     return false;
 }
 
+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);
+        descriptor.setDescriptor(engine->scriptValueToJSCValue(value), attribs);
+        return true;
+    }
+    return false;
+}
+
 void ClassObjectDelegate::put(QScriptObject* object, JSC::ExecState *exec,
                               const JSC::Identifier &propertyName,
                               JSC::JSValue value, JSC::PutPropertySlot &slot)
@@ -105,8 +146,7 @@ void ClassObjectDelegate::put(QScriptObject* object, JSC::ExecState *exec,
 }
 
 bool ClassObjectDelegate::deleteProperty(QScriptObject* object, JSC::ExecState *exec,
-                                         const JSC::Identifier &propertyName,
-                                         bool checkDontDelete)
+                                         const JSC::Identifier &propertyName)
 {
     // ### avoid duplication of put()
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
@@ -124,44 +164,12 @@ bool ClassObjectDelegate::deleteProperty(QScriptObject* object, JSC::ExecState *
         m_scriptClass->setProperty(scriptObject, scriptName, id, QScriptValue());
         return true;
     }
-    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName, checkDontDelete);
-}
-
-bool ClassObjectDelegate::getPropertyAttributes(const QScriptObject* object, JSC::ExecState *exec,
-                                                const JSC::Identifier &propertyName,
-                                                unsigned &attribs) const
-{
-    QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
-    QScript::SaveFrameHelper saveFrame(engine, exec);
-    QScriptValue scriptObject = engine->scriptValueFromJSCValue(object);
-    QScriptString scriptName;
-    QScriptStringPrivate scriptName_d(engine, propertyName, QScriptStringPrivate::StackAllocated);
-    QScriptStringPrivate::init(scriptName, &scriptName_d);
-    uint id = 0;
-    QScriptClass::QueryFlags flags = m_scriptClass->queryProperty(
-        scriptObject, scriptName, QScriptClass::HandlesReadAccess, &id);
-    if (flags & QScriptClass::HandlesReadAccess) {
-        QScriptValue::PropertyFlags flags = m_scriptClass->propertyFlags(scriptObject, scriptName, id);
-        attribs = 0;
-        if (flags & QScriptValue::ReadOnly)
-            attribs |= JSC::ReadOnly;
-        if (flags & QScriptValue::SkipInEnumeration)
-            attribs |= JSC::DontEnum;
-        if (flags & QScriptValue::Undeletable)
-            attribs |= JSC::DontDelete;
-        if (flags & QScriptValue::PropertyGetter)
-            attribs |= JSC::Getter;
-        if (flags & QScriptValue::PropertySetter)
-            attribs |= JSC::Setter;
-        attribs |= flags & QScriptValue::UserRange;
-        return true;
-    }
-    return QScriptObjectDelegate::getPropertyAttributes(object, exec, propertyName, attribs);
+    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName);
 }
 
 void ClassObjectDelegate::getOwnPropertyNames(QScriptObject* object, JSC::ExecState *exec,
                                               JSC::PropertyNameArray &propertyNames,
-                                              bool includeNonEnumerable)
+                                              JSC::EnumerationMode mode)
 {
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     QScript::SaveFrameHelper saveFrame(engine, exec);
@@ -175,7 +183,7 @@ void ClassObjectDelegate::getOwnPropertyNames(QScriptObject* object, JSC::ExecSt
         }
         delete it;
     }
-    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, includeNonEnumerable);
+    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, mode);
 }
 
 JSC::CallType ClassObjectDelegate::getCallData(QScriptObject*, JSC::CallData &callData)
diff --git a/src/script/bridge/qscriptclassobject_p.h b/src/script/bridge/qscriptclassobject_p.h
index 89142ab..83fa61b 100644
--- a/src/script/bridge/qscriptclassobject_p.h
+++ b/src/script/bridge/qscriptclassobject_p.h
@@ -60,18 +60,17 @@ public:
     virtual bool getOwnPropertySlot(QScriptObject*, JSC::ExecState*,
                                     const JSC::Identifier& propertyName,
                                     JSC::PropertySlot&);
+    virtual bool getOwnPropertyDescriptor(QScriptObject*, JSC::ExecState*,
+                                          const JSC::Identifier& propertyName,
+                                          JSC::PropertyDescriptor&);
     virtual void put(QScriptObject*, JSC::ExecState* exec,
                      const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual bool deleteProperty(QScriptObject*, JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(const QScriptObject*, JSC::ExecState*,
-                                       const JSC::Identifier&,
-                                       unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(QScriptObject*, JSC::ExecState*,
                                      JSC::PropertyNameArray&,
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
 
     virtual JSC::CallType getCallData(QScriptObject*, JSC::CallData&);
     static JSC::JSValue JSC_HOST_CALL call(JSC::ExecState*, JSC::JSObject*,
diff --git a/src/script/bridge/qscriptdeclarativeclass.cpp b/src/script/bridge/qscriptdeclarativeclass.cpp
index 46c68ed..acfb2a4 100644
--- a/src/script/bridge/qscriptdeclarativeclass.cpp
+++ b/src/script/bridge/qscriptdeclarativeclass.cpp
@@ -141,19 +141,22 @@ QScriptValue QScriptDeclarativeClass::Value::toScriptValue(QScriptEngine *engine
 }
 
 QScriptDeclarativeClass::PersistentIdentifier::PersistentIdentifier()
-: identifier(0)
+    : identifier(0), engine(0)
 {
     new (&d) JSC::Identifier();
 }
 
 QScriptDeclarativeClass::PersistentIdentifier::~PersistentIdentifier()
 {
+    if (engine)
+        JSC::setCurrentIdentifierTable(engine->globalData->identifierTable);
     ((JSC::Identifier &)d).JSC::Identifier::~Identifier();
 }
 
 QScriptDeclarativeClass::PersistentIdentifier::PersistentIdentifier(const PersistentIdentifier &other)
 {
     identifier = other.identifier;
+    engine = other.engine;
     new (&d) JSC::Identifier((JSC::Identifier &)(other.d));
 }
 
@@ -161,6 +164,7 @@ QScriptDeclarativeClass::PersistentIdentifier &
 QScriptDeclarativeClass::PersistentIdentifier::operator=(const PersistentIdentifier &other)
 {
     identifier = other.identifier;
+    engine = other.engine;
     ((JSC::Identifier &)d) = (JSC::Identifier &)(other.d);
     return *this;
 }
@@ -419,7 +423,7 @@ QScriptDeclarativeClass::createPersistentIdentifier(const QString &str)
         static_cast<QScriptEnginePrivate *>(QObjectPrivate::get(d_ptr->engine)); 
     JSC::ExecState* exec = p->currentFrame;
 
-    PersistentIdentifier rv(true);
+    PersistentIdentifier rv(p);
     new (&rv.d) JSC::Identifier(exec, (UChar *)str.constData(), str.size());
     rv.identifier = (void *)((JSC::Identifier &)rv.d).ustring().rep();
     return rv;
@@ -432,7 +436,7 @@ QScriptDeclarativeClass::createPersistentIdentifier(const Identifier &id)
         static_cast<QScriptEnginePrivate *>(QObjectPrivate::get(d_ptr->engine)); 
     JSC::ExecState* exec = p->currentFrame;
 
-    PersistentIdentifier rv(true);
+    PersistentIdentifier rv(p);
     new (&rv.d) JSC::Identifier(exec, (JSC::UString::Rep *)id);
     rv.identifier = (void *)((JSC::Identifier &)rv.d).ustring().rep();
     return rv;
diff --git a/src/script/bridge/qscriptdeclarativeclass_p.h b/src/script/bridge/qscriptdeclarativeclass_p.h
index 7037e22..714a67c 100644
--- a/src/script/bridge/qscriptdeclarativeclass_p.h
+++ b/src/script/bridge/qscriptdeclarativeclass_p.h
@@ -104,7 +104,8 @@ public:
 
     private:
         friend class QScriptDeclarativeClass;
-        PersistentIdentifier(bool) : identifier(0), d(0) {}
+        PersistentIdentifier(QScriptEnginePrivate *e) : identifier(0), engine(e), d(0) {}
+        QScriptEnginePrivate *engine;
         void *d;
     };
 
diff --git a/src/script/bridge/qscriptdeclarativeobject.cpp b/src/script/bridge/qscriptdeclarativeobject.cpp
index 70bb1bb..6e08b83 100644
--- a/src/script/bridge/qscriptdeclarativeobject.cpp
+++ b/src/script/bridge/qscriptdeclarativeobject.cpp
@@ -66,7 +66,6 @@ bool DeclarativeObjectDelegate::getOwnPropertySlot(QScriptObject* object,
                                                    const JSC::Identifier &propertyName,
                                                    JSC::PropertySlot &slot)
 {
-    QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     QScriptDeclarativeClass::Identifier identifier = (void *)propertyName.ustring().rep();
 
     QScriptDeclarativeClassPrivate *p = QScriptDeclarativeClassPrivate::get(m_class);
@@ -106,43 +105,14 @@ void DeclarativeObjectDelegate::put(QScriptObject* object, JSC::ExecState *exec,
 }
 
 bool DeclarativeObjectDelegate::deleteProperty(QScriptObject* object, JSC::ExecState *exec,
-                                               const JSC::Identifier &propertyName,
-                                               bool checkDontDelete)
-{
-    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName, checkDontDelete);
-}
-
-bool DeclarativeObjectDelegate::getPropertyAttributes(const QScriptObject* object, 
-                                                      JSC::ExecState *exec,
-                                                      const JSC::Identifier &propertyName,
-                                                      unsigned &attribs) const
+                                               const JSC::Identifier &propertyName)
 {
-    QScriptDeclarativeClass::Identifier identifier = (void *)propertyName.ustring().rep();
-
-    QScriptClass::QueryFlags flags = 
-        m_class->queryProperty(m_object, identifier, QScriptClass::HandlesReadAccess);
-    if (flags & QScriptClass::HandlesReadAccess) {
-        QScriptValue::PropertyFlags flags = m_class->propertyFlags(m_object, identifier);
-        attribs = 0;
-        if (flags & QScriptValue::ReadOnly)
-            attribs |= JSC::ReadOnly;
-        if (flags & QScriptValue::SkipInEnumeration)
-            attribs |= JSC::DontEnum;
-        if (flags & QScriptValue::Undeletable)
-            attribs |= JSC::DontDelete;
-        if (flags & QScriptValue::PropertyGetter)
-            attribs |= JSC::Getter;
-        if (flags & QScriptValue::PropertySetter)
-            attribs |= JSC::Setter;
-        attribs |= flags & QScriptValue::UserRange;
-        return true;
-    }
-    return QScriptObjectDelegate::getPropertyAttributes(object, exec, propertyName, attribs);
+    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName);
 }
 
 void DeclarativeObjectDelegate::getOwnPropertyNames(QScriptObject* object, JSC::ExecState *exec,
                                                     JSC::PropertyNameArray &propertyNames,
-                                                    bool includeNonEnumerable)
+                                                    JSC::EnumerationMode mode)
 {
     QStringList properties = m_class->propertyNames(m_object);
     for (int ii = 0; ii < properties.count(); ++ii) {
@@ -150,7 +120,7 @@ void DeclarativeObjectDelegate::getOwnPropertyNames(QScriptObject* object, JSC::
         propertyNames.add(JSC::Identifier(exec, name));
     }
 
-    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, includeNonEnumerable);
+    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, mode);
 }
 
 JSC::CallType DeclarativeObjectDelegate::getCallData(QScriptObject *object, JSC::CallData &callData)
diff --git a/src/script/bridge/qscriptdeclarativeobject_p.h b/src/script/bridge/qscriptdeclarativeobject_p.h
index 878af24..beb5af0 100644
--- a/src/script/bridge/qscriptdeclarativeobject_p.h
+++ b/src/script/bridge/qscriptdeclarativeobject_p.h
@@ -81,14 +81,10 @@ public:
                      const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual bool deleteProperty(QScriptObject*, JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(const QScriptObject*, JSC::ExecState*,
-                                       const JSC::Identifier&,
-                                       unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(QScriptObject*, JSC::ExecState*,
                                      JSC::PropertyNameArray&, 
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
 
     virtual JSC::CallType getCallData(QScriptObject*, JSC::CallData&);
     static JSC::JSValue JSC_HOST_CALL call(JSC::ExecState*, JSC::JSObject*,
diff --git a/src/script/bridge/qscriptglobalobject.cpp b/src/script/bridge/qscriptglobalobject.cpp
index e7ea0df..4c002b7 100644
--- a/src/script/bridge/qscriptglobalobject.cpp
+++ b/src/script/bridge/qscriptglobalobject.cpp
@@ -72,6 +72,23 @@ bool GlobalObject::getOwnPropertySlot(JSC::ExecState* exec,
     return JSC::JSGlobalObject::getOwnPropertySlot(exec, propertyName, slot);
 }
 
+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);
+}
+
 void GlobalObject::put(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                        JSC::JSValue value, JSC::PutPropertySlot& slot)
 {
@@ -90,29 +107,20 @@ void GlobalObject::putWithAttributes(JSC::ExecState* exec, const JSC::Identifier
         JSC::JSGlobalObject::putWithAttributes(exec, propertyName, value, attributes);
 }
 
-bool GlobalObject::deleteProperty(JSC::ExecState* exec,
-                                  const JSC::Identifier& propertyName, bool checkDontDelete)
-{
-    if (customGlobalObject)
-        return customGlobalObject->deleteProperty(exec, propertyName, checkDontDelete);
-    return JSC::JSGlobalObject::deleteProperty(exec, propertyName, checkDontDelete);
-}
-
-bool GlobalObject::getPropertyAttributes(JSC::ExecState* exec, const JSC::Identifier& propertyName,
-                                         unsigned& attributes) const
+bool GlobalObject::deleteProperty(JSC::ExecState* exec, const JSC::Identifier& propertyName)
 {
     if (customGlobalObject)
-        return customGlobalObject->getPropertyAttributes(exec, propertyName, attributes);
-    return JSC::JSGlobalObject::getPropertyAttributes(exec, propertyName, attributes);
+        return customGlobalObject->deleteProperty(exec, propertyName);
+    return JSC::JSGlobalObject::deleteProperty(exec, propertyName);
 }
 
 void GlobalObject::getOwnPropertyNames(JSC::ExecState* exec, JSC::PropertyNameArray& propertyNames,
-                                       bool includeNonEnumerable)
+                                       JSC::EnumerationMode mode)
 {
     if (customGlobalObject)
-        customGlobalObject->getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+        customGlobalObject->getOwnPropertyNames(exec, propertyNames, mode);
     else
-        JSC::JSGlobalObject::getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+        JSC::JSGlobalObject::getOwnPropertyNames(exec, propertyNames, mode);
 }
 
 void GlobalObject::defineGetter(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::JSObject* getterFunction, unsigned attributes)
diff --git a/src/script/bridge/qscriptglobalobject_p.h b/src/script/bridge/qscriptglobalobject_p.h
index b210f78..c0a419f 100644
--- a/src/script/bridge/qscriptglobalobject_p.h
+++ b/src/script/bridge/qscriptglobalobject_p.h
@@ -54,17 +54,17 @@ public:
     virtual bool getOwnPropertySlot(JSC::ExecState*,
                                     const JSC::Identifier& propertyName,
                                     JSC::PropertySlot&);
+    virtual bool getOwnPropertyDescriptor(JSC::ExecState*,
+                                          const JSC::Identifier& propertyName,
+                                          JSC::PropertyDescriptor&);
     virtual void put(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual void putWithAttributes(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                                    JSC::JSValue value, unsigned attributes);
     virtual bool deleteProperty(JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(JSC::ExecState*, const JSC::Identifier&,
-                                       unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&,
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
     virtual void defineGetter(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSObject* getterFunction, unsigned attributes = 0);
     virtual void defineSetter(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSObject* setterFunction, unsigned attributes = 0);
     virtual JSC::JSValue lookupGetter(JSC::ExecState*, const JSC::Identifier& propertyName);
@@ -94,19 +94,20 @@ public:
                                     const JSC::Identifier& propertyName,
                                     JSC::PropertySlot& slot)
     { return originalGlobalObject->JSC::JSGlobalObject::getOwnPropertySlot(exec, propertyName, slot); }
+    virtual bool getOwnPropertyDescriptor(JSC::ExecState* exec,
+                                          const JSC::Identifier& propertyName,
+                                          JSC::PropertyDescriptor& descriptor)
+    { return originalGlobalObject->JSC::JSGlobalObject::getOwnPropertyDescriptor(exec, propertyName, descriptor); }
     virtual void put(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                      JSC::JSValue value, JSC::PutPropertySlot& slot)
     { originalGlobalObject->JSC::JSGlobalObject::put(exec, propertyName, value, slot); }
     virtual void putWithAttributes(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::JSValue value, unsigned attributes)
     { originalGlobalObject->JSC::JSGlobalObject::putWithAttributes(exec, propertyName, value, attributes); }
     virtual bool deleteProperty(JSC::ExecState* exec,
-                                const JSC::Identifier& propertyName, bool checkDontDelete = true)
-    { return originalGlobalObject->JSC::JSGlobalObject::deleteProperty(exec, propertyName, checkDontDelete); }
-    virtual bool getPropertyAttributes(JSC::ExecState* exec, const JSC::Identifier& propertyName,
-                                       unsigned& attributes) const
-    { return originalGlobalObject->JSC::JSGlobalObject::getPropertyAttributes(exec, propertyName, attributes); }
-    virtual void getOwnPropertyNames(JSC::ExecState* exec, JSC::PropertyNameArray& propertyNames, bool includeNonEnumerable = false)
-    { originalGlobalObject->JSC::JSGlobalObject::getOwnPropertyNames(exec, propertyNames, includeNonEnumerable); }
+                                const JSC::Identifier& propertyName)
+    { return originalGlobalObject->JSC::JSGlobalObject::deleteProperty(exec, propertyName); }
+    virtual void getOwnPropertyNames(JSC::ExecState* exec, JSC::PropertyNameArray& propertyNames, JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties)
+    { originalGlobalObject->JSC::JSGlobalObject::getOwnPropertyNames(exec, propertyNames, mode); }
     virtual void defineGetter(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::JSObject* getterFunction, unsigned attributes)
     { originalGlobalObject->JSC::JSGlobalObject::defineGetter(exec, propertyName, getterFunction, attributes); }
     virtual void defineSetter(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::JSObject* setterFunction, unsigned attributes)
diff --git a/src/script/bridge/qscriptobject.cpp b/src/script/bridge/qscriptobject.cpp
index 3db109e..9b6910e 100644
--- a/src/script/bridge/qscriptobject.cpp
+++ b/src/script/bridge/qscriptobject.cpp
@@ -81,30 +81,21 @@ void QScriptObject::put(JSC::ExecState* exec, const JSC::Identifier& propertyNam
 }
 
 bool QScriptObject::deleteProperty(JSC::ExecState* exec,
-                                   const JSC::Identifier& propertyName,
-                                   bool checkDontDelete)
+                                   const JSC::Identifier& propertyName)
 {
     if (!d || !d->delegate)
-        return JSC::JSObject::deleteProperty(exec, propertyName, checkDontDelete);
-    return d->delegate->deleteProperty(this, exec, propertyName, checkDontDelete);
-}
-
-bool QScriptObject::getPropertyAttributes(JSC::ExecState* exec, const JSC::Identifier& propertyName,
-                                          unsigned& attributes) const
-{
-    if (!d || !d->delegate)
-        return JSC::JSObject::getPropertyAttributes(exec, propertyName, attributes);
-    return d->delegate->getPropertyAttributes(this, exec, propertyName, attributes);
+        return JSC::JSObject::deleteProperty(exec, propertyName);
+    return d->delegate->deleteProperty(this, exec, propertyName);
 }
 
 void QScriptObject::getOwnPropertyNames(JSC::ExecState* exec, JSC::PropertyNameArray& propertyNames,
-                                        bool includeNonEnumerable)
+                                        JSC::EnumerationMode mode)
 {
     if (!d || !d->delegate) {
-        JSC::JSObject::getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+        JSC::JSObject::getOwnPropertyNames(exec, propertyNames, mode);
         return;
     }
-    d->delegate->getOwnPropertyNames(this, exec, propertyNames, includeNonEnumerable);
+    d->delegate->getOwnPropertyNames(this, exec, propertyNames, mode);
 }
 
 bool QScriptObject::compareToObject(JSC::ExecState* exec, JSC::JSObject *other)
@@ -189,25 +180,16 @@ void QScriptObjectDelegate::put(QScriptObject* object, JSC::ExecState* exec,
 }
 
 bool QScriptObjectDelegate::deleteProperty(QScriptObject* object, JSC::ExecState* exec,
-                                           const JSC::Identifier& propertyName,
-                                           bool checkDontDelete)
-{
-    return object->JSC::JSObject::deleteProperty(exec, propertyName, checkDontDelete);
-}
-
-bool QScriptObjectDelegate::getPropertyAttributes(const QScriptObject* object,
-                                                  JSC::ExecState* exec,
-                                                  const JSC::Identifier& propertyName,
-                                                  unsigned& attributes) const
+                                           const JSC::Identifier& propertyName)
 {
-    return object->JSC::JSObject::getPropertyAttributes(exec, propertyName, attributes);
+    return object->JSC::JSObject::deleteProperty(exec, propertyName);
 }
 
 void QScriptObjectDelegate::getOwnPropertyNames(QScriptObject* object, JSC::ExecState* exec,
                                                 JSC::PropertyNameArray& propertyNames,
-                                                bool includeNonEnumerable)
+                                                JSC::EnumerationMode mode)
 {
-    object->JSC::JSObject::getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+    object->JSC::JSObject::getOwnPropertyNames(exec, propertyNames, mode);
 }
 
 void QScriptObjectDelegate::markChildren(QScriptObject* object, JSC::MarkStack& markStack)
diff --git a/src/script/bridge/qscriptobject_p.h b/src/script/bridge/qscriptobject_p.h
index 4d15bee..f6de418 100644
--- a/src/script/bridge/qscriptobject_p.h
+++ b/src/script/bridge/qscriptobject_p.h
@@ -67,12 +67,9 @@ public:
     virtual void put(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual bool deleteProperty(JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(JSC::ExecState*, const JSC::Identifier&,
-                                       unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&,
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
     virtual void markChildren(JSC::MarkStack& markStack);
     virtual JSC::CallType getCallData(JSC::CallData&);
     virtual JSC::ConstructType getConstructData(JSC::ConstructData&);
@@ -84,7 +81,7 @@ public:
 
     static WTF::PassRefPtr<JSC::Structure> createStructure(JSC::JSValue prototype)
     {
-        return JSC::Structure::create(prototype, JSC::TypeInfo(JSC::ObjectType, JSC::ImplementsHasInstance | JSC::OverridesHasInstance));
+        return JSC::Structure::create(prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags));
     }
 
     inline JSC::JSValue data() const;
@@ -94,6 +91,8 @@ public:
     inline void setDelegate(QScriptObjectDelegate *delegate);
 
 protected:
+    static const unsigned StructureFlags = JSC::ImplementsHasInstance | JSC::OverridesHasInstance | JSC::OverridesGetOwnPropertySlot | JSC::OverridesMarkChildren | JSC::OverridesGetPropertyNames | JSObject::StructureFlags;
+
     Data *d;
 };
 
@@ -128,12 +127,9 @@ public:
     virtual void put(QScriptObject*, JSC::ExecState* exec, const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual bool deleteProperty(QScriptObject*, JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(const QScriptObject*, JSC::ExecState*,
-                                       const JSC::Identifier&, unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(QScriptObject*, JSC::ExecState*, JSC::PropertyNameArray&,
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
     virtual void markChildren(QScriptObject*, JSC::MarkStack& markStack);
     virtual JSC::CallType getCallData(QScriptObject*, JSC::CallData&);
     virtual JSC::ConstructType getConstructData(QScriptObject*, JSC::ConstructData&);
diff --git a/src/script/bridge/qscriptqobject.cpp b/src/script/bridge/qscriptqobject.cpp
index 6c401f8..765e074 100644
--- a/src/script/bridge/qscriptqobject.cpp
+++ b/src/script/bridge/qscriptqobject.cpp
@@ -537,40 +537,43 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                 continue;
         }
 
+        QList<QByteArray> parameterTypeNames = method.parameterTypes();
+
         QVector<QScriptMetaType> types;
+        types.resize(1 + parameterTypeNames.size());
+        QScriptMetaType *typesData = types.data();
         // resolve return type
         QByteArray returnTypeName = method.typeName();
         int rtype = QMetaType::type(returnTypeName);
         if ((rtype == 0) && !returnTypeName.isEmpty()) {
             int enumIndex = indexOfMetaEnum(meta, returnTypeName);
             if (enumIndex != -1)
-                types.append(QScriptMetaType::metaEnum(enumIndex, returnTypeName));
+                typesData[0] = QScriptMetaType::metaEnum(enumIndex, returnTypeName);
             else
-                types.append(QScriptMetaType::unresolved(returnTypeName));
+                typesData[0] = QScriptMetaType::unresolved(returnTypeName);
         } else {
             if (callType == QMetaMethod::Constructor)
-                types.append(QScriptMetaType::metaType(QMetaType::QObjectStar, "QObject*"));
+                typesData[0] = QScriptMetaType::metaType(QMetaType::QObjectStar, "QObject*");
             else if (rtype == QMetaType::QVariant)
-                types.append(QScriptMetaType::variant());
+                typesData[0] = QScriptMetaType::variant();
             else
-                types.append(QScriptMetaType::metaType(rtype, returnTypeName));
+                typesData[0] = QScriptMetaType::metaType(rtype, returnTypeName);
         }
 
         // resolve argument types
-        QList<QByteArray> parameterTypeNames = method.parameterTypes();
         for (int i = 0; i < parameterTypeNames.count(); ++i) {
             QByteArray argTypeName = parameterTypeNames.at(i);
             int atype = QMetaType::type(argTypeName);
             if (atype == 0) {
                 int enumIndex = indexOfMetaEnum(meta, argTypeName);
                 if (enumIndex != -1)
-                    types.append(QScriptMetaType::metaEnum(enumIndex, argTypeName));
+                    typesData[1 + i] = QScriptMetaType::metaEnum(enumIndex, argTypeName);
                 else
-                    types.append(QScriptMetaType::unresolved(argTypeName));
+                    typesData[1 + i] = QScriptMetaType::unresolved(argTypeName);
             } else if (atype == QMetaType::QVariant) {
-                types.append(QScriptMetaType::variant());
+                typesData[1 + i] = QScriptMetaType::variant();
             } else {
-                types.append(QScriptMetaType::metaType(atype, argTypeName));
+                typesData[1 + i] = QScriptMetaType::metaType(atype, argTypeName);
             }
         }
 
@@ -1298,7 +1301,7 @@ bool QObjectDelegate::getOwnPropertyDescriptor(QScriptObject *object, JSC::ExecS
                                          const JSC::Identifier &propertyName,
                                          JSC::PropertyDescriptor &descriptor)
 {
-    //Note: this has to be kept in sync with getOwnPropertySlot abd getPropertyAttributes
+    //Note: this has to be kept in sync with getOwnPropertySlot
 #ifndef QT_NO_PROPERTIES
     QByteArray name = convertToLatin1(propertyName.ustring());
     QObject *qobject = data->value;
@@ -1528,8 +1531,7 @@ void QObjectDelegate::put(QScriptObject *object, JSC::ExecState* exec,
 }
 
 bool QObjectDelegate::deleteProperty(QScriptObject *object, JSC::ExecState *exec,
-                                     const JSC::Identifier& propertyName,
-                                     bool checkDontDelete)
+                                     const JSC::Identifier& propertyName)
 {
 #ifndef QT_NO_PROPERTIES
     QByteArray name = convertToLatin1(propertyName.ustring());
@@ -1569,86 +1571,7 @@ bool QObjectDelegate::deleteProperty(QScriptObject *object, JSC::ExecState *exec
         return true;
     }
 
-    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName, checkDontDelete);
-#else //QT_NO_PROPERTIES
-    return false;
-#endif //QT_NO_PROPERTIES
-}
-
-bool QObjectDelegate::getPropertyAttributes(const QScriptObject *object,
-                                            JSC::ExecState *exec,
-                                            const JSC::Identifier &propertyName,
-                                            unsigned &attributes) const
-{
-#ifndef QT_NO_PROPERTIES
-    //Note: this has to be kept in sync with getOwnPropertyDescriptor and getOwnPropertySlot
-    QByteArray name = convertToLatin1(propertyName.ustring());
-    QObject *qobject = data->value;
-    if (!qobject)
-        return false;
-
-    const QScriptEngine::QObjectWrapOptions &opt = data->options;
-    const QMetaObject *meta = qobject->metaObject();
-    int index = -1;
-    if (name.contains('(')) {
-        QByteArray normalized = QMetaObject::normalizedSignature(name);
-        if (-1 != (index = meta->indexOfMethod(normalized))) {
-            QMetaMethod method = meta->method(index);
-            if (hasMethodAccess(method, index, opt)) {
-                if (!(opt & QScriptEngine::ExcludeSuperClassMethods)
-                    || (index >= meta->methodOffset())) {
-                    attributes = QObjectMemberAttribute;
-                    if (opt & QScriptEngine::SkipMethodsInEnumeration)
-                        attributes |= JSC::DontEnum;
-                    return true;
-                }
-            }
-        }
-    }
-
-    index = meta->indexOfProperty(name);
-    if (index != -1) {
-        QMetaProperty prop = meta->property(index);
-        if (prop.isScriptable()) {
-            if (!(opt & QScriptEngine::ExcludeSuperClassProperties)
-                || (index >= meta->propertyOffset())) {
-                attributes = flagsForMetaProperty(prop);
-                return true;
-            }
-        }
-    }
-
-    index = qobject->dynamicPropertyNames().indexOf(name);
-    if (index != -1) {
-        attributes = QObjectMemberAttribute;
-        return true;
-    }
-
-    const int offset = (opt & QScriptEngine::ExcludeSuperClassMethods)
-                       ? meta->methodOffset() : 0;
-    for (index = meta->methodCount() - 1; index >= offset; --index) {
-        QMetaMethod method = meta->method(index);
-        if (hasMethodAccess(method, index, opt)
-            && methodNameEquals(method, name.constData(), name.length())) {
-            attributes = QObjectMemberAttribute;
-            if (opt & QScriptEngine::SkipMethodsInEnumeration)
-                attributes |= JSC::DontEnum;
-            return true;
-        }
-    }
-
-    if (!(opt & QScriptEngine::ExcludeChildObjects)) {
-        QList<QObject*> children = qobject->children();
-        for (index = 0; index < children.count(); ++index) {
-            QObject *child = children.at(index);
-            if (child->objectName() == (QString)(propertyName.ustring())) {
-                attributes = JSC::ReadOnly | JSC::DontDelete | JSC::DontEnum;
-                return true;
-            }
-        }
-    }
-
-    return QScriptObjectDelegate::getPropertyAttributes(object, exec, propertyName, attributes);
+    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName);
 #else //QT_NO_PROPERTIES
     return false;
 #endif //QT_NO_PROPERTIES
@@ -1656,7 +1579,7 @@ bool QObjectDelegate::getPropertyAttributes(const QScriptObject *object,
 
 void QObjectDelegate::getOwnPropertyNames(QScriptObject *object, JSC::ExecState *exec,
                                           JSC::PropertyNameArray &propertyNames,
-                                          bool includeNonEnumerable)
+                                          JSC::EnumerationMode mode)
 {
 #ifndef QT_NO_PROPERTIES
     QObject *qobject = data->value;
@@ -1701,7 +1624,7 @@ void QObjectDelegate::getOwnPropertyNames(QScriptObject *object, JSC::ExecState
         }
     }
 
-    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, includeNonEnumerable);
+    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, mode);
 #endif //QT_NO_PROPERTIES
 }
 
@@ -1884,6 +1807,39 @@ bool QMetaObjectWrapperObject::getOwnPropertySlot(
     return JSC::JSObject::getOwnPropertySlot(exec, propertyName, slot);
 }
 
+bool QMetaObjectWrapperObject::getOwnPropertyDescriptor(
+    JSC::ExecState* exec, const JSC::Identifier& propertyName,
+    JSC::PropertyDescriptor& descriptor)
+{
+    const QMetaObject *meta = data->value;
+    if (!meta)
+        return false;
+
+    if (propertyName == exec->propertyNames().prototype) {
+        descriptor.setDescriptor(data->ctor
+                                 ? data->ctor.get(exec, propertyName)
+                                 : data->prototype,
+                                 JSC::DontDelete | JSC::DontEnum);
+        return true;
+    }
+
+    QByteArray name = QString(propertyName.ustring()).toLatin1();
+
+    for (int i = 0; i < meta->enumeratorCount(); ++i) {
+        QMetaEnum e = meta->enumerator(i);
+        for (int j = 0; j < e.keyCount(); ++j) {
+            const char *key = e.key(j);
+            if (!qstrcmp(key, name.constData())) {
+                descriptor.setDescriptor(JSC::JSValue(exec, e.value(j)),
+                                         JSC::ReadOnly | JSC::DontDelete);
+                return true;
+            }
+        }
+    }
+
+    return JSC::JSObject::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+}
+
 void QMetaObjectWrapperObject::put(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                                    JSC::JSValue value, JSC::PutPropertySlot &slot)
 {
@@ -1909,8 +1865,7 @@ void QMetaObjectWrapperObject::put(JSC::ExecState* exec, const JSC::Identifier&
 }
 
 bool QMetaObjectWrapperObject::deleteProperty(
-    JSC::ExecState *exec, const JSC::Identifier& propertyName,
-    bool checkDontDelete)
+    JSC::ExecState *exec, const JSC::Identifier& propertyName)
 {
     if (propertyName == exec->propertyNames().prototype)
         return false;
@@ -1925,36 +1880,12 @@ bool QMetaObjectWrapperObject::deleteProperty(
             }
         }
     }
-    return JSC::JSObject::deleteProperty(exec, propertyName, checkDontDelete);
-}
-
-bool QMetaObjectWrapperObject::getPropertyAttributes(JSC::ExecState *exec,
-                                                     const JSC::Identifier &propertyName,
-                                                     unsigned &attributes) const
-{
-    if (propertyName == exec->propertyNames().prototype) {
-        attributes = JSC::DontDelete;
-        return true;
-    }
-    const QMetaObject *meta = data->value;
-    if (meta) {
-        QByteArray name = convertToLatin1(propertyName.ustring());
-        for (int i = 0; i < meta->enumeratorCount(); ++i) {
-            QMetaEnum e = meta->enumerator(i);
-            for (int j = 0; j < e.keyCount(); ++j) {
-                if (!qstrcmp(e.key(j), name.constData())) {
-                    attributes = JSC::ReadOnly | JSC::DontDelete;
-                    return true;
-                }
-            }
-        }
-    }
-    return JSC::JSObject::getPropertyAttributes(exec, propertyName, attributes);
+    return JSC::JSObject::deleteProperty(exec, propertyName);
 }
 
 void QMetaObjectWrapperObject::getOwnPropertyNames(JSC::ExecState *exec,
                                                    JSC::PropertyNameArray &propertyNames,
-                                                   bool includeNonEnumerable)
+                                                   JSC::EnumerationMode mode)
 {
     const QMetaObject *meta = data->value;
     if (!meta)
@@ -1964,7 +1895,7 @@ void QMetaObjectWrapperObject::getOwnPropertyNames(JSC::ExecState *exec,
         for (int j = 0; j < e.keyCount(); ++j)
             propertyNames.add(JSC::Identifier(exec, e.key(j)));
     }
-    JSC::JSObject::getOwnPropertyNames(exec, propertyNames, includeNonEnumerable);
+    JSC::JSObject::getOwnPropertyNames(exec, propertyNames, mode);
 }
 
 void QMetaObjectWrapperObject::markChildren(JSC::MarkStack& markStack)
diff --git a/src/script/bridge/qscriptqobject_p.h b/src/script/bridge/qscriptqobject_p.h
index 8b05d6b..b82bcb7 100644
--- a/src/script/bridge/qscriptqobject_p.h
+++ b/src/script/bridge/qscriptqobject_p.h
@@ -86,14 +86,10 @@ public:
                      const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual bool deleteProperty(QScriptObject*, JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(const QScriptObject*, JSC::ExecState*,
-                                       const JSC::Identifier&,
-                                       unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(QScriptObject*, JSC::ExecState*,
                                      JSC::PropertyNameArray&,
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
     virtual void markChildren(QScriptObject*, JSC::MarkStack& markStack);
     virtual bool compareToObject(QScriptObject*, JSC::ExecState*, JSC::JSObject*);
 
@@ -275,15 +271,15 @@ public:
     virtual bool getOwnPropertySlot(JSC::ExecState*,
                                     const JSC::Identifier& propertyName,
                                     JSC::PropertySlot&);
+    virtual bool getOwnPropertyDescriptor(JSC::ExecState*,
+                                          const JSC::Identifier& propertyName,
+                                          JSC::PropertyDescriptor&);
     virtual void put(JSC::ExecState* exec, const JSC::Identifier& propertyName,
                      JSC::JSValue, JSC::PutPropertySlot&);
     virtual bool deleteProperty(JSC::ExecState*,
-                                const JSC::Identifier& propertyName,
-                                bool checkDontDelete = true);
-    virtual bool getPropertyAttributes(JSC::ExecState*, const JSC::Identifier&,
-                                       unsigned&) const;
+                                const JSC::Identifier& propertyName);
     virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&,
-                                     bool includeNonEnumerable = false);
+                                     JSC::EnumerationMode mode = JSC::ExcludeDontEnumProperties);
     virtual void markChildren(JSC::MarkStack& markStack);
 
     virtual JSC::CallType getCallData(JSC::CallData&);
@@ -303,10 +299,12 @@ public:
 
     static WTF::PassRefPtr<JSC::Structure> createStructure(JSC::JSValue prototype)
     {
-        return JSC::Structure::create(prototype, JSC::TypeInfo(JSC::ObjectType));
+        return JSC::Structure::create(prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags));
     }
 
 protected:
+    static const unsigned StructureFlags = JSC::OverridesGetOwnPropertySlot | JSC::OverridesMarkChildren | JSC::OverridesGetPropertyNames | JSObject::StructureFlags;
+
     Data *data;
 };
 
diff --git a/src/script/bridge/qscriptvariant.cpp b/src/script/bridge/qscriptvariant.cpp
index b4f0365..b2dd3b0 100644
--- a/src/script/bridge/qscriptvariant.cpp
+++ b/src/script/bridge/qscriptvariant.cpp
@@ -119,11 +119,8 @@ static JSC::JSValue JSC_HOST_CALL variantProtoFuncToString(JSC::ExecState *exec,
     JSC::JSValue value = variantProtoFuncValueOf(exec, callee, thisValue, args);
     if (value.isObject()) {
         result = v.toString();
-        if (result.isEmpty() && !v.canConvert(QVariant::String)) {
-            result = "QVariant(";
-            result += v.typeName();
-            result += ")";
-        }
+        if (result.isEmpty() && !v.canConvert(QVariant::String))
+            result = QString::fromLatin1("QVariant(%0)").arg(QString::fromLatin1(v.typeName()));
     } else {
         result = value.toString(exec);
     }
diff --git a/src/script/script.pro b/src/script/script.pro
index 771047a..df5dbf3 100644
--- a/src/script/script.pro
+++ b/src/script/script.pro
@@ -39,6 +39,11 @@ wince* {
     LIBS += -lmmtimer
 }
 
+mac {
+    DEFINES += ENABLE_JSC_MULTIPLE_THREADS=0
+    LIBS_PRIVATE += -framework AppKit
+}
+
 include($$WEBKITDIR/JavaScriptCore/JavaScriptCore.pri)
 
 INCLUDEPATH += $$WEBKITDIR/JavaScriptCore
@@ -68,7 +73,7 @@ solaris-g++:isEqual(QT_ARCH,sparc) {
 }
 
 # Avoid JSC C API functions being exported.
-DEFINES += JS_EXPORT="" JS_EXPORTDATA=""
+DEFINES += JS_NO_EXPORT JS_EXPORTDATA=""
 
 INCLUDEPATH += $$PWD