Improve signal handler performance

import QtQuick 2.0

Rectangle {
    width: 240; height: 320

    Component {
        id: numberComponent
        QtObject {
            id: obj
            property real a: 0
            NumberAnimation on a {
                from: 0; to: 1; duration: 16
                onCompleted: obj.destroy();
            }
        }
    }

    Timer {
        interval: 16; running: true; repeat: false
        onTriggered: {
            for (var i = 0; i < 400; ++i)
                numberComponent.createObject();
        }
    }

    Rectangle {
        width: 20; height: 20
        color: "green"

        SequentialAnimation on x {
            loops: Animation.Infinite
            NumberAnimation { from: 0; to: 220; duration: 2000 }
            NumberAnimation { from: 220; to: 0; duration: 2000 }
        }
    }
}

diff --git a/src/declarative/qml/qdeclarativecompiler.cpp b/src/declarative/qml/qdeclarativecompiler.cpp
index fb98a8c..9eaefdf 100644
--- a/src/declarative/qml/qdeclarativecompiler.cpp
+++ b/src/declarative/qml/qdeclarativecompiler.cpp
@@ -1227,8 +1227,9 @@ void QDeclarativeCompiler::genObjectBody(QDeclarativeScript::Object *obj)
 
             Instruction::StoreSignal store;
             store.signalIndex = prop->index;
-            store.value =
-                output->indexForString(v->value.asScript().trimmed());
+            //store.value =
+            //    output->indexForString(v->value.asScript().trimmed());
+            store.value = rewriteBinding(v->value.asScript().trimmed(), QString()); // XXX
             store.context = v->signalExpressionContextStack;
             store.name = output->indexForByteArray(prop->name().toUtf8());
             store.line = v->location.start.line;
diff --git a/src/declarative/qml/qdeclarativevme.cpp b/src/declarative/qml/qdeclarativevme.cpp
index 52095e3..ef0f86c 100644
--- a/src/declarative/qml/qdeclarativevme.cpp
+++ b/src/declarative/qml/qdeclarativevme.cpp
@@ -861,9 +861,10 @@ QObject *QDeclarativeVME::run(QList<QDeclarativeError> *errors,
 
             QDeclarativeBoundSignal *bs = new QDeclarativeBoundSignal(target, signal, target);
             QDeclarativeExpression *expr = 
-                new QDeclarativeExpression(CTXT, context, PRIMITIVES.at(instr.value));
-            expr->setSourceLocation(COMP->name, instr.line);
-            static_cast<QDeclarativeExpressionPrivate *>(QObjectPrivate::get(expr))->name = QString::fromUtf8(DATAS.at(instr.name));
+                    new QDeclarativeExpression(CTXT, context, PRIMITIVES.at(instr.value), true, COMP->name, instr.line, *new QDeclarativeExpressionPrivate);
+            //    new QDeclarativeExpression(CTXT, context, PRIMITIVES.at(instr.value));
+            //expr->setSourceLocation(COMP->name, instr.line);
+            //static_cast<QDeclarativeExpressionPrivate *>(QObjectPrivate::get(expr))->name = QString::fromUtf8(DATAS.at(instr.name));
             bs->setExpression(expr);
         QML_END_INSTR(StoreSignal)