示例#1
0
/*!
    Return the name of this QML property.
*/
QString QDeclarativeProperty::name() const
{
    if (!d->isNameCached) {
        // ###
        if (!d->object) {
        } else if (d->isValueType()) {
            QString rv = d->core.name(d->object) + QLatin1Char('.');

            QDeclarativeEnginePrivate *ep = d->engine?QDeclarativeEnginePrivate::get(d->engine):0;
            QDeclarativeValueType *valueType = 0;
            if (ep) valueType = ep->valueTypes[d->core.propType];
            else valueType = QDeclarativeValueTypeFactory::valueType(d->core.propType);
            Q_ASSERT(valueType);

            rv += QString::fromUtf8(valueType->metaObject()->property(d->valueType.valueTypeCoreIdx).name());

            if (!ep) delete valueType;

            d->nameCache = rv;
        } else if (type() & SignalProperty) {
            QString name = QLatin1String("on") + d->core.name(d->object);
            name[2] = name.at(2).toUpper();
            d->nameCache = name;
        } else {
            d->nameCache = d->core.name(d->object);
        }
        d->isNameCached = true;
    }

    return d->nameCache;
}
QDeclarativeValueType *QDeclarativeValueTypeFactory::valueType(int t)
{
    QDeclarativeValueType *rv = 0;

    switch (t) {
    case QVariant::Point:
        rv = new QDeclarativePointValueType;
        break;
    case QVariant::PointF:
        rv = new QDeclarativePointFValueType;
        break;
    case QVariant::Size:
        rv = new QDeclarativeSizeValueType;
        break;
    case QVariant::SizeF:
        rv = new QDeclarativeSizeFValueType;
        break;
    case QVariant::Rect:
        rv = new QDeclarativeRectValueType;
        break;
    case QVariant::RectF:
        rv = new QDeclarativeRectFValueType;
        break;
    case QVariant::Vector2D:
        rv = new QDeclarativeVector2DValueType;
        break;
    case QVariant::Vector3D:
        rv = new QDeclarativeVector3DValueType;
        break;
    case QVariant::Vector4D:
        rv = new QDeclarativeVector4DValueType;
        break;
    case QVariant::Quaternion:
        rv = new QDeclarativeQuaternionValueType;
        break;
    case QVariant::Matrix4x4:
        rv = new QDeclarativeMatrix4x4ValueType;
        break;
    case QVariant::EasingCurve:
        rv = new QDeclarativeEasingValueType;
        break;
    case QVariant::Font:
        rv = new QDeclarativeFontValueType;
        break;
    default:
        break;
    }

    Q_ASSERT(!rv || rv->metaObject()->propertyCount() < 32);
    return rv;
}
示例#3
0
/*!
    Returns the type name of the property, or 0 if the property has no type
    name.
*/
const char *QDeclarativeProperty::propertyTypeName() const
{
    if (d->isValueType()) {

        QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(d->context);
        QDeclarativeValueType *valueType = 0;
        if (ep) valueType = ep->valueTypes[d->core.propType];
        else valueType = QDeclarativeValueTypeFactory::valueType(d->core.propType);
        Q_ASSERT(valueType);

        const char *rv = valueType->metaObject()->property(d->valueType.valueTypeCoreIdx).typeName();

        if (!ep) delete valueType;

        return rv;
    } else if (d->object && type() & Property && d->core.isValid()) {
        return d->object->metaObject()->property(d->core.coreIndex).typeName();
    } else {
        return 0;
    }
}
QStringList propertyNameForWritableProperties(QObject *object, const QString &baseName = QString())
{
    QStringList propertyNameList;

    const QMetaObject *metaObject = object->metaObject();
    for (int index = 0; index < metaObject->propertyCount(); ++index) {
        QMetaProperty metaProperty = metaObject->property(index);
        if (metaProperty.isReadable() && !metaProperty.isWritable()) {
            QObject *childObject = QDeclarativeMetaType::toQObject(metaProperty.read(object));
            if (childObject)
                propertyNameList.append(propertyNameForWritableProperties(childObject, baseName +  QString::fromUtf8(metaProperty.name()) + '.'));
        } else if (QDeclarativeValueTypeFactory::valueType(metaProperty.userType())) {
            QDeclarativeValueType *valueType = QDeclarativeValueTypeFactory::valueType(metaProperty.userType());
            valueType->setValue(metaProperty.read(object));
            propertyNameList.append(propertyNameForWritableProperties(valueType, baseName +  QString::fromUtf8(metaProperty.name()) + '.'));
        } else if (metaProperty.isReadable() && metaProperty.isWritable()) {
            propertyNameList.append(baseName + QString::fromUtf8(metaProperty.name()));
        }
    }

    return propertyNameList;
}
示例#5
0
bool QDeclarativePropertyPrivate::writeValueProperty(const QVariant &value, WriteFlags flags)
{
    // Remove any existing bindings on this property
    if (!(flags & DontRemoveBinding)) {
        QDeclarativeAbstractBinding *binding = setBinding(*q, 0);
        if (binding) binding->destroy();
    }

    bool rv = false;
    if (isValueType()) {
        QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context);

        QDeclarativeValueType *writeBack = 0;
        if (ep) {
            writeBack = ep->valueTypes[core.propType];
        } else {
            writeBack = QDeclarativeValueTypeFactory::valueType(core.propType);
        }

        writeBack->read(object, core.coreIndex);

        QDeclarativePropertyCache::Data data = core;
        data.flags = valueType.flags;
        data.coreIndex = valueType.valueTypeCoreIdx;
        data.propType = valueType.valueTypePropType;
        rv = write(writeBack, data, value, context, flags);

        writeBack->write(object, core.coreIndex, flags);
        if (!ep) delete writeBack;

    } else {

        rv = write(object, core, value, context, flags);

    }

    return rv;
}
示例#6
0
QVariant QDeclarativePropertyPrivate::readValueProperty()
{
    if (isValueType()) {

        QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context);
        QDeclarativeValueType *valueType = 0;
        if (ep) valueType = ep->valueTypes[core.propType];
        else valueType = QDeclarativeValueTypeFactory::valueType(core.propType);
        Q_ASSERT(valueType);

        valueType->read(object, core.coreIndex);

        QVariant rv =
            valueType->metaObject()->property(this->valueType.valueTypeCoreIdx).read(valueType);

        if (!ep) delete valueType;
        return rv;

    } else if (core.flags & QDeclarativePropertyCache::Data::IsQList) {

        QDeclarativeListProperty<QObject> prop;
        void *args[] = { &prop, 0 };
        QMetaObject::metacall(object, QMetaObject::ReadProperty, core.coreIndex, args);
        return QVariant::fromValue(QDeclarativeListReferencePrivate::init(prop, core.propType, engine)); 

    } else if (core.flags & QDeclarativePropertyCache::Data::IsQObjectDerived) {

        QObject *rv = 0;
        void *args[] = { &rv, 0 };
        QMetaObject::metacall(object, QMetaObject::ReadProperty, core.coreIndex, args);
        return QVariant::fromValue(rv);

    } else {

        return object->metaObject()->property(core.coreIndex).read(object.data());

    }
}
int QDeclarativeVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
{
    int id = _id;
    if(c == QMetaObject::WriteProperty) {
        int flags = *reinterpret_cast<int*>(a[3]);
        if (!(flags & QDeclarativePropertyPrivate::BypassInterceptor)
            && !aInterceptors.isEmpty()
            && aInterceptors.testBit(id)) {
            QPair<int, QDeclarativePropertyValueInterceptor*> pair = interceptors.value(id);
            int valueIndex = pair.first;
            QDeclarativePropertyValueInterceptor *vi = pair.second;
            int type = property(id).userType();

            if (type != QVariant::Invalid) {
                if (valueIndex != -1) {
                    QDeclarativeEnginePrivate *ep = ctxt?QDeclarativeEnginePrivate::get(ctxt->engine):0;
                    QDeclarativeValueType *valueType = 0;
                    if (ep) valueType = ep->valueTypes[type];
                    else valueType = QDeclarativeValueTypeFactory::valueType(type);
                    Q_ASSERT(valueType);

                    valueType->setValue(QVariant(type, a[0]));
                    QMetaProperty valueProp = valueType->metaObject()->property(valueIndex);
                    vi->write(valueProp.read(valueType));

                    if (!ep) delete valueType;
                    return -1;
                } else {
                    vi->write(QVariant(type, a[0]));
                    return -1;
                }
            }
        }
    }
    if(c == QMetaObject::ReadProperty || c == QMetaObject::WriteProperty) {
        if (id >= propOffset) {
            id -= propOffset;

            if (id < metaData->propertyCount) {
               int t = (metaData->propertyData() + id)->propertyType;
                bool needActivate = false;

                if (t == -1) {

                    if (c == QMetaObject::ReadProperty) {
                        *reinterpret_cast<QVariant *>(a[0]) = readVarPropertyAsVariant(id);
                    } else if (c == QMetaObject::WriteProperty) {
                        writeVarProperty(id, *reinterpret_cast<QVariant *>(a[0]));
                    }

                } else {

                    if (c == QMetaObject::ReadProperty) {
                        switch(t) {
                        case QVariant::Int:
                            *reinterpret_cast<int *>(a[0]) = data[id].asInt();
                            break;
                        case QVariant::Bool:
                            *reinterpret_cast<bool *>(a[0]) = data[id].asBool();
                            break;
                        case QVariant::Double:
                            *reinterpret_cast<double *>(a[0]) = data[id].asDouble();
                            break;
                        case QVariant::String:
                            *reinterpret_cast<QString *>(a[0]) = data[id].asQString();
                            break;
                        case QVariant::Url:
                            *reinterpret_cast<QUrl *>(a[0]) = data[id].asQUrl();
                            break;
                        case QVariant::Color:
                            *reinterpret_cast<QColor *>(a[0]) = data[id].asQColor();
                            break;
                        case QVariant::Date:
                            *reinterpret_cast<QDate *>(a[0]) = data[id].asQDate();
                            break;
                        case QVariant::DateTime:
                            *reinterpret_cast<QDateTime *>(a[0]) = data[id].asQDateTime();
                            break;
                        case QMetaType::QObjectStar:
                            *reinterpret_cast<QObject **>(a[0]) = data[id].asQObject();
                            break;
                        default:
                            break;
                        }
                        if (t == qMetaTypeId<QDeclarativeListProperty<QObject> >()) {
                            int listIndex = data[id].asInt();
                            const List *list = &listProperties.at(listIndex);
                            *reinterpret_cast<QDeclarativeListProperty<QObject> *>(a[0]) = 
                                QDeclarativeListProperty<QObject>(object, (void *)list,
                                                                  list_append, list_count, list_at, 
                                                                  list_clear);
                        }

                    } else if (c == QMetaObject::WriteProperty) {

                        switch(t) {
                        case QVariant::Int:
                            needActivate = *reinterpret_cast<int *>(a[0]) != data[id].asInt();
                            data[id].setValue(*reinterpret_cast<int *>(a[0]));
                            break;
                        case QVariant::Bool:
                            needActivate = *reinterpret_cast<bool *>(a[0]) != data[id].asBool();
                            data[id].setValue(*reinterpret_cast<bool *>(a[0]));
                            break;
                        case QVariant::Double:
                            needActivate = *reinterpret_cast<double *>(a[0]) != data[id].asDouble();
                            data[id].setValue(*reinterpret_cast<double *>(a[0]));
                            break;
                        case QVariant::String:
                            needActivate = *reinterpret_cast<QString *>(a[0]) != data[id].asQString();
                            data[id].setValue(*reinterpret_cast<QString *>(a[0]));
                            break;
                        case QVariant::Url:
                            needActivate = *reinterpret_cast<QUrl *>(a[0]) != data[id].asQUrl();
                            data[id].setValue(*reinterpret_cast<QUrl *>(a[0]));
                            break;
                        case QVariant::Color:
                            needActivate = *reinterpret_cast<QColor *>(a[0]) != data[id].asQColor();
                            data[id].setValue(*reinterpret_cast<QColor *>(a[0]));
                            break;
                        case QVariant::Date:
                            needActivate = *reinterpret_cast<QDate *>(a[0]) != data[id].asQDate();
                            data[id].setValue(*reinterpret_cast<QDate *>(a[0]));
                            break;
                        case QVariant::DateTime:
                            needActivate = *reinterpret_cast<QDateTime *>(a[0]) != data[id].asQDateTime();
                            data[id].setValue(*reinterpret_cast<QDateTime *>(a[0]));
                            break;
                        case QMetaType::QObjectStar:
                            needActivate = *reinterpret_cast<QObject **>(a[0]) != data[id].asQObject();
                            data[id].setValue(*reinterpret_cast<QObject **>(a[0]));
                            break;
                        default:
                            break;
                        }
                    }

                }

                if (c == QMetaObject::WriteProperty && needActivate) {
                    activate(object, methodOffset + id, 0);
                }

                return -1;
            }

            id -= metaData->propertyCount;

            if (id < metaData->aliasCount) {

                QDeclarativeVMEMetaData::AliasData *d = metaData->aliasData() + id;

                if (d->flags & QML_ALIAS_FLAG_PTR && c == QMetaObject::ReadProperty) 
                        *reinterpret_cast<void **>(a[0]) = 0;

                if (!ctxt) return -1;

                QDeclarativeContext *context = ctxt->asQDeclarativeContext();
                QDeclarativeContextPrivate *ctxtPriv = QDeclarativeContextPrivate::get(context);

                QObject *target = ctxtPriv->data->idValues[d->contextIdx].data();
                if (!target) 
                    return -1;

                connectAlias(id);

                if (d->isObjectAlias()) {
                    *reinterpret_cast<QObject **>(a[0]) = target;
                    return -1;
                } 
                
                // Remove binding (if any) on write
                if(c == QMetaObject::WriteProperty) {
                    int flags = *reinterpret_cast<int*>(a[3]);
                    if (flags & QDeclarativePropertyPrivate::RemoveBindingOnAliasWrite) {
                        QDeclarativeData *targetData = QDeclarativeData::get(target);
                        if (targetData && targetData->hasBindingBit(d->propertyIndex())) {
                            QDeclarativeAbstractBinding *binding = QDeclarativePropertyPrivate::setBinding(target, d->propertyIndex(), d->isValueTypeAlias()?d->valueTypeIndex():-1, 0);
                            if (binding) binding->destroy();
                        }
                    }
                }
                
                if (d->isValueTypeAlias()) {
                    // Value type property
                    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);

                    QDeclarativeValueType *valueType = ep->valueTypes[d->valueType()];
                    Q_ASSERT(valueType);

                    valueType->read(target, d->propertyIndex());
                    int rv = QMetaObject::metacall(valueType, c, d->valueTypeIndex(), a);
                    
                    if (c == QMetaObject::WriteProperty)
                        valueType->write(target, d->propertyIndex(), 0x00);

                    return rv;

                } else {
                    return QMetaObject::metacall(target, c, d->propertyIndex(), a);
                }

            }
            return -1;

        }

    } else if(c == QMetaObject::InvokeMetaMethod) {

        if (id >= methodOffset) {

            id -= methodOffset;
            int plainSignals = metaData->signalCount + metaData->propertyCount +
                               metaData->aliasCount;
            if (id < plainSignals) {
                QMetaObject::activate(object, _id, a);
                return -1;
            }

            id -= plainSignals;

            if (id < metaData->methodCount) {
                if (!ctxt->engine)
                    return -1; // We can't run the method

                QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);

                QScriptValue function = method(id);

                QScriptValueList args;
                QDeclarativeVMEMetaData::MethodData *data = metaData->methodData() + id;
                if (data->parameterCount) {
                    for (int ii = 0; ii < data->parameterCount; ++ii) {
                        args << ep->scriptValueFromVariant(*(QVariant *)a[ii + 1]);
                    }
                }
                QScriptValue rv = function.call(ep->objectClass->newQObject(object), args);

                if (a[0]) *reinterpret_cast<QVariant *>(a[0]) = ep->scriptValueToVariant(rv);

                return -1;
            }
            return -1;
        }
    }

    if (parent)
        return parent->metaCall(c, _id, a);
    else
        return object->qt_metacall(c, _id, a);
}
示例#8
0
QObject *QDeclarativeVME::run(QDeclarativeVMEObjectStack &stack, 
                              QDeclarativeContextData *ctxt, 
                              QDeclarativeCompiledData *comp, 
                              int start, int count, 
                              const QBitField &bindingSkipList)
{
    Q_ASSERT(comp);
    Q_ASSERT(ctxt);
    const QList<QDeclarativeCompiledData::TypeReference> &types = comp->types;
    const QList<QString> &primitives = comp->primitives;
    const QList<QByteArray> &datas = comp->datas;
    const QList<QDeclarativeCompiledData::CustomTypeData> &customTypeData = comp->customTypeData;
    const QList<int> &intData = comp->intData;
    const QList<float> &floatData = comp->floatData;
    const QList<QDeclarativePropertyCache *> &propertyCaches = comp->propertyCaches;
    const QList<QDeclarativeParser::Object::ScriptBlock> &scripts = comp->scripts;
    const QList<QUrl> &urls = comp->urls;

    QDeclarativeEnginePrivate::SimpleList<QDeclarativeAbstractBinding> bindValues;
    QDeclarativeEnginePrivate::SimpleList<QDeclarativeParserStatus> parserStatus;

    QDeclarativeVMEStack<ListInstance> qliststack;

    vmeErrors.clear();
    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);

    int status = -1;    //for dbus
    QDeclarativePropertyPrivate::WriteFlags flags = QDeclarativePropertyPrivate::BypassInterceptor |
                                                    QDeclarativePropertyPrivate::RemoveBindingOnAliasWrite;

    for (int ii = start; !isError() && ii < (start + count); ++ii) {
        const QDeclarativeInstruction &instr = comp->bytecode.at(ii);

        switch(instr.type) {
        case QDeclarativeInstruction::Init:
            {
                if (instr.init.bindingsSize) 
                    bindValues = QDeclarativeEnginePrivate::SimpleList<QDeclarativeAbstractBinding>(instr.init.bindingsSize);
                if (instr.init.parserStatusSize)
                    parserStatus = QDeclarativeEnginePrivate::SimpleList<QDeclarativeParserStatus>(instr.init.parserStatusSize);
                if (instr.init.contextCache != -1) 
                    ctxt->setIdPropertyData(comp->contextCaches.at(instr.init.contextCache));
                if (instr.init.compiledBinding != -1) 
                    ctxt->optimizedBindings = new QDeclarativeCompiledBindings(datas.at(instr.init.compiledBinding).constData(), ctxt, comp);
            }
            break;

        case QDeclarativeInstruction::CreateObject:
            {
                QBitField bindings;
                if (instr.create.bindingBits != -1) {
                    const QByteArray &bits = datas.at(instr.create.bindingBits);
                    bindings = QBitField((const quint32*)bits.constData(),
                                         bits.size() * 8);
                }
                if (stack.isEmpty())
                    bindings = bindings.united(bindingSkipList);

                QObject *o = 
                    types.at(instr.create.type).createInstance(ctxt, bindings, &vmeErrors);

                if (!o) {
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Unable to create object of type %1").arg(QString::fromLatin1(types.at(instr.create.type).className)));
                }

                QDeclarativeData *ddata = QDeclarativeData::get(o);
                Q_ASSERT(ddata);

                if (stack.isEmpty()) {
                    if (ddata->context) {
                        Q_ASSERT(ddata->context != ctxt);
                        Q_ASSERT(ddata->outerContext);
                        Q_ASSERT(ddata->outerContext != ctxt);
                        QDeclarativeContextData *c = ddata->context;
                        while (c->linkedContext) c = c->linkedContext;
                        c->linkedContext = ctxt;
                    } else {
                        ctxt->addObject(o);
                    }

                    ddata->ownContext = true;
                } else if (!ddata->context) {
                    ctxt->addObject(o);
                }

                ddata->setImplicitDestructible();
                ddata->outerContext = ctxt;
                ddata->lineNumber = instr.line;
                ddata->columnNumber = instr.create.column;

                if (instr.create.data != -1) {
                    QDeclarativeCustomParser *customParser =
                        types.at(instr.create.type).type->customParser();
                    customParser->setCustomData(o, datas.at(instr.create.data));
                }
                if (!stack.isEmpty()) {
                    QObject *parent = stack.top();
                    if (o->isWidgetType()) { 
                        QWidget *widget = static_cast<QWidget*>(o); 
                        if (parent->isWidgetType()) { 
                            QWidget *parentWidget = static_cast<QWidget*>(parent); 
                            widget->setParent(parentWidget); 
                        } else { 
                            // TODO: parent might be a layout 
                        } 
                    } else { 
			    QDeclarative_setParent_noEvent(o, parent);
                    } 
                }
                stack.push(o);
            }
            break;

        case QDeclarativeInstruction::CreateSimpleObject:
            {
                QObject *o = (QObject *)operator new(instr.createSimple.typeSize + 
                                                     sizeof(QDeclarativeData));   
                ::memset(static_cast<void *>(o), 0, instr.createSimple.typeSize + sizeof(QDeclarativeData));
                instr.createSimple.create(o);

                QDeclarativeData *ddata = (QDeclarativeData *)(((const char *)o) + instr.createSimple.typeSize);
                const QDeclarativeCompiledData::TypeReference &ref = types.at(instr.createSimple.type);
                if (!ddata->propertyCache && ref.typePropertyCache) {
                    ddata->propertyCache = ref.typePropertyCache;
                    ddata->propertyCache->addref();
                }
                ddata->lineNumber = instr.line;
                ddata->columnNumber = instr.createSimple.column;

                QObjectPrivate::get(o)->declarativeData = ddata;                                                      
                ddata->context = ddata->outerContext = ctxt;
                ddata->nextContextObject = ctxt->contextObjects; 
                if (ddata->nextContextObject) 
                    ddata->nextContextObject->prevContextObject = &ddata->nextContextObject; 
                ddata->prevContextObject = &ctxt->contextObjects; 
                ctxt->contextObjects = ddata; 

                QObject *parent = stack.top();                                                                    
                QDeclarative_setParent_noEvent(o, parent);                                                        

                stack.push(o);
            }
            break;

        case QDeclarativeInstruction::SetId:
            {
                QObject *target = stack.top();
                ctxt->setIdProperty(instr.setId.index, target);
            }
            break;


        case QDeclarativeInstruction::SetDefault:
            {
                ctxt->contextObject = stack.top();
            }
            break;

        case QDeclarativeInstruction::CreateComponent:
            {
                QDeclarativeComponent *qcomp = 
                    new QDeclarativeComponent(ctxt->engine, comp, ii + 1, instr.createComponent.count,
                                              stack.isEmpty() ? 0 : stack.top());

                QDeclarativeData *ddata = QDeclarativeData::get(qcomp, true);
                Q_ASSERT(ddata);

                ctxt->addObject(qcomp);

                if (stack.isEmpty()) 
                    ddata->ownContext = true;

                ddata->setImplicitDestructible();
                ddata->outerContext = ctxt;
                ddata->lineNumber = instr.line;
                ddata->columnNumber = instr.create.column;

                QDeclarativeComponentPrivate::get(qcomp)->creationContext = ctxt;

                stack.push(qcomp);
                ii += instr.createComponent.count;
            }
            break;

        case QDeclarativeInstruction::StoreMetaObject:
            {
                QObject *target = stack.top();

                QMetaObject mo;
                const QByteArray &metadata = datas.at(instr.storeMeta.data);
                QMetaObjectBuilder::fromRelocatableData(&mo, 0, metadata);

                const QDeclarativeVMEMetaData *data = 
                    (const QDeclarativeVMEMetaData *)datas.at(instr.storeMeta.aliasData).constData();

                (void)new QDeclarativeVMEMetaObject(target, &mo, data, comp);

                if (instr.storeMeta.propertyCache != -1) {
                    QDeclarativeData *ddata = QDeclarativeData::get(target, true);
                    if (ddata->propertyCache) ddata->propertyCache->release();
                    ddata->propertyCache = propertyCaches.at(instr.storeMeta.propertyCache);
                    ddata->propertyCache->addref();
                }
            }
            break;

        case QDeclarativeInstruction::StoreVariant:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeString.propertyIndex);

                // XXX - can be more efficient
                QVariant v = QDeclarativeStringConverters::variantFromString(primitives.at(instr.storeString.value));
                void *a[] = { &v, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeString.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreVariantInteger:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeString.propertyIndex);

                QVariant v(instr.storeInteger.value);
                void *a[] = { &v, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeString.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreVariantDouble:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeString.propertyIndex);

                QVariant v(instr.storeDouble.value);
                void *a[] = { &v, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeString.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreVariantBool:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeString.propertyIndex);

                QVariant v(instr.storeBool.value);
                void *a[] = { &v, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeString.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreString:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeString.propertyIndex);

                void *a[] = { (void *)&primitives.at(instr.storeString.value), 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeString.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreUrl:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeUrl.propertyIndex);

                void *a[] = { (void *)&urls.at(instr.storeUrl.value), 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeUrl.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreFloat:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeFloat.propertyIndex);

                float f = instr.storeFloat.value;
                void *a[] = { &f, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty,
                                      instr.storeFloat.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreDouble:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeDouble.propertyIndex);

                double d = instr.storeDouble.value;
                void *a[] = { &d, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty,
                                      instr.storeDouble.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreBool:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeBool.propertyIndex);

                void *a[] = { (void *)&instr.storeBool.value, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeBool.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreInteger:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeInteger.propertyIndex);

                void *a[] = { (void *)&instr.storeInteger.value, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeInteger.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreColor:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeColor.propertyIndex);

                QColor c = QColor::fromRgba(instr.storeColor.value);
                void *a[] = { &c, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeColor.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreDate:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeDate.propertyIndex);

                QDate d = QDate::fromJulianDay(instr.storeDate.value);
                void *a[] = { &d, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeDate.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreTime:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeTime.propertyIndex);

                QTime t;
                t.setHMS(intData.at(instr.storeTime.valueIndex),
                         intData.at(instr.storeTime.valueIndex+1),
                         intData.at(instr.storeTime.valueIndex+2),
                         intData.at(instr.storeTime.valueIndex+3));
                void *a[] = { &t, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeTime.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreDateTime:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeDateTime.propertyIndex);

                QTime t;
                t.setHMS(intData.at(instr.storeDateTime.valueIndex+1),
                         intData.at(instr.storeDateTime.valueIndex+2),
                         intData.at(instr.storeDateTime.valueIndex+3),
                         intData.at(instr.storeDateTime.valueIndex+4));
                QDateTime dt(QDate::fromJulianDay(intData.at(instr.storeDateTime.valueIndex)), t);
                void *a[] = { &dt, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty,
                                      instr.storeDateTime.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StorePoint:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeRealPair.propertyIndex);

                QPoint p = QPointF(floatData.at(instr.storeRealPair.valueIndex),
                                   floatData.at(instr.storeRealPair.valueIndex+1)).toPoint();
                void *a[] = { &p, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeRealPair.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StorePointF:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeRealPair.propertyIndex);

                QPointF p(floatData.at(instr.storeRealPair.valueIndex),
                          floatData.at(instr.storeRealPair.valueIndex+1));
                void *a[] = { &p, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeRealPair.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreSize:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeRealPair.propertyIndex);

                QSize p = QSizeF(floatData.at(instr.storeRealPair.valueIndex),
                                 floatData.at(instr.storeRealPair.valueIndex+1)).toSize();
                void *a[] = { &p, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeRealPair.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreSizeF:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeRealPair.propertyIndex);

                QSizeF s(floatData.at(instr.storeRealPair.valueIndex),
                         floatData.at(instr.storeRealPair.valueIndex+1));
                void *a[] = { &s, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeRealPair.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreRect:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeRect.propertyIndex);

                QRect r = QRectF(floatData.at(instr.storeRect.valueIndex),
                                 floatData.at(instr.storeRect.valueIndex+1),
                                 floatData.at(instr.storeRect.valueIndex+2),
                                 floatData.at(instr.storeRect.valueIndex+3)).toRect();
                void *a[] = { &r, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeRect.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreRectF:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeRect.propertyIndex);

                QRectF r(floatData.at(instr.storeRect.valueIndex),
                         floatData.at(instr.storeRect.valueIndex+1),
                         floatData.at(instr.storeRect.valueIndex+2),
                         floatData.at(instr.storeRect.valueIndex+3));
                void *a[] = { &r, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeRect.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreVector3D:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeVector3D.propertyIndex);

                QVector3D p(floatData.at(instr.storeVector3D.valueIndex),
                            floatData.at(instr.storeVector3D.valueIndex+1),
                            floatData.at(instr.storeVector3D.valueIndex+2));
                void *a[] = { &p, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeVector3D.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreObject:
            {
                QObject *assignObj = stack.pop();
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeObject.propertyIndex);

                void *a[] = { (void *)&assignObj, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeObject.propertyIndex, a);
            }
            break;


        case QDeclarativeInstruction::AssignCustomType:
            {
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.assignCustomType.propertyIndex);

                QDeclarativeCompiledData::CustomTypeData data = customTypeData.at(instr.assignCustomType.valueIndex);
                const QString &primitive = primitives.at(data.index);
                QDeclarativeMetaType::StringConverter converter = 
                    QDeclarativeMetaType::customStringConverter(data.type);
                QVariant v = (*converter)(primitive);

                QMetaProperty prop = 
                        target->metaObject()->property(instr.assignCustomType.propertyIndex);
                if (v.isNull() || ((int)prop.type() != data.type && prop.userType() != data.type)) 
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot assign value %1 to property %2").arg(primitive).arg(QString::fromUtf8(prop.name())));

                void *a[] = { (void *)v.data(), 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.assignCustomType.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::AssignSignalObject:
            {
                // XXX optimize

                QObject *assign = stack.pop();
                QObject *target = stack.top();
                int sigIdx = instr.assignSignalObject.signal;
                const QByteArray &pr = datas.at(sigIdx);

                QDeclarativeProperty prop(target, QString::fromUtf8(pr));
                if (prop.type() & QDeclarativeProperty::SignalProperty) {

                    QMetaMethod method = QDeclarativeMetaType::defaultMethod(assign);
                    if (method.signature() == 0)
                        VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot assign object type %1 with no default method").arg(QString::fromLatin1(assign->metaObject()->className())));

                    if (!QMetaObject::checkConnectArgs(prop.method().signature(), method.signature()))
                        VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot connect mismatched signal/slot %1 %vs. %2").arg(QString::fromLatin1(method.signature())).arg(QString::fromLatin1(prop.method().signature())));

                    QDeclarativePropertyPrivate::connect(target, prop.index(), assign, method.methodIndex());

                } else {
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot assign an object to signal property %1").arg(QString::fromUtf8(pr)));
                }


            }
            break;

        case QDeclarativeInstruction::StoreSignal:
            {
                QObject *target = stack.top();
                QObject *context = stack.at(stack.count() - 1 - instr.storeSignal.context);

                QMetaMethod signal = target->metaObject()->method(instr.storeSignal.signalIndex);

                QDeclarativeBoundSignal *bs = new QDeclarativeBoundSignal(target, signal, target);
                QDeclarativeExpression *expr = 
                    new QDeclarativeExpression(ctxt, context, primitives.at(instr.storeSignal.value));
                expr->setSourceLocation(comp->name, instr.line);
                static_cast<QDeclarativeExpressionPrivate *>(QObjectPrivate::get(expr))->name = datas.at(instr.storeSignal.name);
                bs->setExpression(expr);
            }
            break;

        case QDeclarativeInstruction::StoreImportedScript:
            {
                ctxt->addImportedScript(scripts.at(instr.storeScript.value));
            }
            break;

        case QDeclarativeInstruction::StoreScriptString:
            {
                QObject *target = stack.top();
                QObject *scope = stack.at(stack.count() - 1 - instr.storeScriptString.scope);
                QDeclarativeScriptString ss;
                ss.setContext(ctxt->asQDeclarativeContext());
                ss.setScopeObject(scope);
                ss.setScript(primitives.at(instr.storeScriptString.value));

                void *a[] = { &ss, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeScriptString.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::BeginObject:
            {
                QObject *target = stack.top();
                QDeclarativeParserStatus *status = reinterpret_cast<QDeclarativeParserStatus *>(reinterpret_cast<char *>(target) + instr.begin.castValue);
                parserStatus.append(status);
                status->d = &parserStatus.values[parserStatus.count - 1];

                status->classBegin();
            }
            break;

        case QDeclarativeInstruction::StoreBinding:
        case QDeclarativeInstruction::StoreBindingOnAlias:
            {
                QObject *target = 
                    stack.at(stack.count() - 1 - instr.assignBinding.owner);
                QObject *context = 
                    stack.at(stack.count() - 1 - instr.assignBinding.context);

                QDeclarativeProperty mp = 
                    QDeclarativePropertyPrivate::restore(datas.at(instr.assignBinding.property), target, ctxt);

                int coreIndex = mp.index();

                if ((stack.count() - instr.assignBinding.owner) == 1 && bindingSkipList.testBit(coreIndex)) 
                    break;

                QDeclarativeBinding *bind = new QDeclarativeBinding((void *)datas.at(instr.assignBinding.value).constData(), comp, context, ctxt, comp->name, instr.line, 0);
                bindValues.append(bind);
                bind->m_mePtr = &bindValues.values[bindValues.count - 1];
                bind->setTarget(mp);

                if (instr.type == QDeclarativeInstruction::StoreBindingOnAlias) {
                    QDeclarativeAbstractBinding *old = QDeclarativePropertyPrivate::setBindingNoEnable(target, coreIndex, QDeclarativePropertyPrivate::valueTypeCoreIndex(mp), bind);
                    if (old) { old->destroy(); }
                } else {
                    bind->addToObject(target, QDeclarativePropertyPrivate::bindingIndex(mp));
                }
            }
            break;

        case QDeclarativeInstruction::StoreCompiledBinding:
            {
                QObject *target = 
                    stack.at(stack.count() - 1 - instr.assignBinding.owner);
                QObject *scope = 
                    stack.at(stack.count() - 1 - instr.assignBinding.context);

                int property = instr.assignBinding.property;
                if (stack.count() == 1 && bindingSkipList.testBit(property & 0xFFFF))  
                    break;

                QDeclarativeAbstractBinding *binding = 
                    ctxt->optimizedBindings->configBinding(instr.assignBinding.value, target, scope, property);
                bindValues.append(binding);
                binding->m_mePtr = &bindValues.values[bindValues.count - 1];
                binding->addToObject(target, property);
            }
            break;

        case QDeclarativeInstruction::StoreValueSource:
            {
                QObject *obj = stack.pop();
                QDeclarativePropertyValueSource *vs = reinterpret_cast<QDeclarativePropertyValueSource *>(reinterpret_cast<char *>(obj) + instr.assignValueSource.castValue);
                QObject *target = stack.at(stack.count() - 1 - instr.assignValueSource.owner);

                QDeclarativeProperty prop = 
                    QDeclarativePropertyPrivate::restore(datas.at(instr.assignValueSource.property), target, ctxt);
                obj->setParent(target);
                vs->setTarget(prop);
            }
            break;

        case QDeclarativeInstruction::StoreValueInterceptor:
            {
                QObject *obj = stack.pop();
                QDeclarativePropertyValueInterceptor *vi = reinterpret_cast<QDeclarativePropertyValueInterceptor *>(reinterpret_cast<char *>(obj) + instr.assignValueInterceptor.castValue);
                QObject *target = stack.at(stack.count() - 1 - instr.assignValueInterceptor.owner);
                QDeclarativeProperty prop = 
                    QDeclarativePropertyPrivate::restore(datas.at(instr.assignValueInterceptor.property), target, ctxt);
                obj->setParent(target);
                vi->setTarget(prop);
                QDeclarativeVMEMetaObject *mo = static_cast<QDeclarativeVMEMetaObject *>((QMetaObject*)target->metaObject());
                mo->registerInterceptor(prop.index(), QDeclarativePropertyPrivate::valueTypeCoreIndex(prop), vi);
            }
            break;

        case QDeclarativeInstruction::StoreObjectQList:
            {
                QObject *assign = stack.pop();

                const ListInstance &list = qliststack.top();
                list.qListProperty.append((QDeclarativeListProperty<void>*)&list.qListProperty, assign);
            }
            break;

        case QDeclarativeInstruction::AssignObjectList:
            {
                // This is only used for assigning interfaces
                QObject *assign = stack.pop();
                const ListInstance &list = qliststack.top();

                int type = list.type;

                void *ptr = 0;

                const char *iid = QDeclarativeMetaType::interfaceIId(type);
                if (iid) 
                    ptr = assign->qt_metacast(iid);
                if (!ptr) 
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot assign object to list"));


                list.qListProperty.append((QDeclarativeListProperty<void>*)&list.qListProperty, ptr);
            }
            break;

        case QDeclarativeInstruction::StoreVariantObject:
            {
                QObject *assign = stack.pop();
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeObject.propertyIndex);

                QVariant v = QVariant::fromValue(assign);
                void *a[] = { &v, 0, &status, &flags };
                QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                      instr.storeObject.propertyIndex, a);
            }
            break;

        case QDeclarativeInstruction::StoreInterface:
            {
                QObject *assign = stack.pop();
                QObject *target = stack.top();
                CLEAN_PROPERTY(target, instr.storeObject.propertyIndex);

                int coreIdx = instr.storeObject.propertyIndex;
                QMetaProperty prop = target->metaObject()->property(coreIdx);
                int t = prop.userType();
                const char *iid = QDeclarativeMetaType::interfaceIId(t);
                bool ok = false;
                if (iid) {
                    void *ptr = assign->qt_metacast(iid);
                    if (ptr) {
                        void *a[] = { &ptr, 0, &status, &flags };
                        QMetaObject::metacall(target, 
                                              QMetaObject::WriteProperty,
                                              coreIdx, a);
                        ok = true;
                    }
                } 

                if (!ok) 
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot assign object to interface property"));
            }
            break;
            
        case QDeclarativeInstruction::FetchAttached:
            {
                QObject *target = stack.top();

                QObject *qmlObject = qmlAttachedPropertiesObjectById(instr.fetchAttached.id, target);

                if (!qmlObject)
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Unable to create attached object"));

                stack.push(qmlObject);
            }
            break;

        case QDeclarativeInstruction::FetchQList:
            {
                QObject *target = stack.top();

                qliststack.push(ListInstance(instr.fetchQmlList.type));

                void *a[1];
                a[0] = (void *)&(qliststack.top().qListProperty);
                QMetaObject::metacall(target, QMetaObject::ReadProperty, 
                                      instr.fetchQmlList.property, a);
            }
            break;

        case QDeclarativeInstruction::FetchObject:
            {
                QObject *target = stack.top();

                QObject *obj = 0;
                // NOTE: This assumes a cast to QObject does not alter the 
                // object pointer
                void *a[1];
                a[0] = &obj;
                QMetaObject::metacall(target, QMetaObject::ReadProperty, 
                                      instr.fetch.property, a);

                if (!obj)
                    VME_EXCEPTION(QCoreApplication::translate("QDeclarativeVME","Cannot set properties on %1 as it is null").arg(QString::fromUtf8(target->metaObject()->property(instr.fetch.property).name())));

                stack.push(obj);
            }
            break;

        case QDeclarativeInstruction::PopQList:
            {
                qliststack.pop();
            }
            break;

        case QDeclarativeInstruction::Defer:
            {
                if (instr.defer.deferCount) {
                    QObject *target = stack.top();
                    QDeclarativeData *data = 
                        QDeclarativeData::get(target, true);
                    comp->addref();
                    data->deferredComponent = comp;
                    data->deferredIdx = ii;
                    ii += instr.defer.deferCount;
                }
            }
            break;

        case QDeclarativeInstruction::PopFetchedObject:
            {
                stack.pop();
            }
            break;

        case QDeclarativeInstruction::FetchValueType:
            {
                QObject *target = stack.top();

                if (instr.fetchValue.bindingSkipList != 0) {
                    // Possibly need to clear bindings
                    QDeclarativeData *targetData = QDeclarativeData::get(target);
                    if (targetData) {
                        QDeclarativeAbstractBinding *binding = 
                            QDeclarativePropertyPrivate::binding(target, instr.fetchValue.property, -1);

                        if (binding && binding->bindingType() != QDeclarativeAbstractBinding::ValueTypeProxy) {
                            QDeclarativePropertyPrivate::setBinding(target, instr.fetchValue.property, -1, 0);
                            binding->destroy();
                        } else if (binding) {
                            QDeclarativeValueTypeProxyBinding *proxy = 
                                static_cast<QDeclarativeValueTypeProxyBinding *>(binding);
                            proxy->removeBindings(instr.fetchValue.bindingSkipList);
                        }
                    }
                }

                QDeclarativeValueType *valueHandler = ep->valueTypes[instr.fetchValue.type];
                valueHandler->read(target, instr.fetchValue.property);
                stack.push(valueHandler);
            }
            break;

        case QDeclarativeInstruction::PopValueType:
            {
                QDeclarativeValueType *valueHandler = 
                    static_cast<QDeclarativeValueType *>(stack.pop());
                QObject *target = stack.top();
                valueHandler->write(target, instr.fetchValue.property, 
                                    QDeclarativePropertyPrivate::BypassInterceptor);
            }
            break;

        default:
            qFatal("QDeclarativeCompiledData: Internal error - unknown instruction %d", instr.type);
            break;
        }
    }

    if (isError()) {
        if (!stack.isEmpty()) {
            delete stack.at(0); // ### What about failures in deferred creation?
        } else {
            ctxt->destroy();
        }

        QDeclarativeEnginePrivate::clear(bindValues);
        QDeclarativeEnginePrivate::clear(parserStatus);
        return 0;
    }

    if (bindValues.count)
        ep->bindValues << bindValues;
    else if (bindValues.values)
        bindValues.clear();

    if (parserStatus.count)
        ep->parserStatus << parserStatus;
    else if (parserStatus.values)
        parserStatus.clear();

    Q_ASSERT(stack.count() == 1);
    return stack.top();
}