Merge remote-tracking branch 'qt/4.8'

Conflicts:
	src/s60installs/eabi/QtOpenGLu.def

23 files changed, 1585 insertions, 50 deletions

diff --git a/src/declarative/debugger/debugger.pri b/src/declarative/debugger/debugger.pri
index 75287b4..044db3c 100644
--- a/src/declarative/debugger/debugger.pri
+++ b/src/declarative/debugger/debugger.pri
@@ -8,7 +8,10 @@ SOURCES += \
     $$PWD/qdeclarativedebug.cpp \
     $$PWD/qdeclarativedebugtrace.cpp \
     $$PWD/qdeclarativedebughelper.cpp \
-    $$PWD/qdeclarativedebugserver.cpp
+    $$PWD/qdeclarativedebugserver.cpp \
+    $$PWD/qdeclarativeobserverservice.cpp \
+    $$PWD/qjsdebuggeragent.cpp \
+    $$PWD/qjsdebugservice.cpp
 
 HEADERS += \
     $$PWD/qdeclarativedebuggerstatus_p.h \
@@ -20,4 +23,8 @@ HEADERS += \
     $$PWD/qdeclarativedebugtrace_p.h \
     $$PWD/qdeclarativedebughelper_p.h \
     $$PWD/qdeclarativedebugserver_p.h \
-    debugger/qdeclarativedebugserverconnection_p.h
+    $$PWD/qdeclarativedebugserverconnection_p.h \
+    $$PWD/qdeclarativeobserverservice_p.h \
+    $$PWD/qdeclarativeobserverinterface_p.h \
+    $$PWD/qjsdebuggeragent_p.h \
+    $$PWD/qjsdebugservice_p.h
diff --git a/src/declarative/debugger/qdeclarativedebugserver.cpp b/src/declarative/debugger/qdeclarativedebugserver.cpp
index 5112af0..4343870 100644
--- a/src/declarative/debugger/qdeclarativedebugserver.cpp
+++ b/src/declarative/debugger/qdeclarativedebugserver.cpp
@@ -90,7 +90,11 @@ public:
     QHash<QString, QDeclarativeDebugService *> plugins;
     QStringList clientPlugins;
     bool gotHello;
+    QString waitingForMsgFromService;
 
+private:
+    // private slot
+    void _q_deliverMessage(const QString &serviceName, const QByteArray &message);
     static QDeclarativeDebugServerConnection *loadConnectionPlugin(const QString &pluginName);
 };
 
@@ -237,7 +241,6 @@ void QDeclarativeDebugServer::receiveMessage(const QByteArray &message)
 
     QDataStream in(message);
     if (!d->gotHello) {
-
         QString name;
         int op;
         in >> name >> op;
@@ -252,6 +255,17 @@ void QDeclarativeDebugServer::receiveMessage(const QByteArray &message)
         int version;
         in >> version >> d->clientPlugins;
 
+        // Send the hello answer immediately, since it needs to arrive before
+        // the plugins below start sending messages.
+        QByteArray helloAnswer;
+        {
+            QDataStream out(&helloAnswer, QIODevice::WriteOnly);
+            out << QString(QLatin1String("QDeclarativeDebugClient")) << 0 << protocolVersion << d->plugins.keys();
+        }
+        d->connection->send(helloAnswer);
+
+        d->gotHello = true;
+
         QHash<QString, QDeclarativeDebugService*>::Iterator iter = d->plugins.begin();
         for (; iter != d->plugins.end(); ++iter) {
             QDeclarativeDebugService::Status newStatus = QDeclarativeDebugService::Unavailable;
@@ -261,14 +275,6 @@ void QDeclarativeDebugServer::receiveMessage(const QByteArray &message)
             iter.value()->statusChanged(newStatus);
         }
 
-        QByteArray helloAnswer;
-        {
-            QDataStream out(&helloAnswer, QIODevice::WriteOnly);
-            out << QString(QLatin1String("QDeclarativeDebugClient")) << 0 << protocolVersion << d->plugins.keys();
-        }
-        d->connection->send(helloAnswer);
-
-        d->gotHello = true;
         qWarning("QDeclarativeDebugServer: Connection established");
     } else {
 
@@ -306,17 +312,33 @@ void QDeclarativeDebugServer::receiveMessage(const QByteArray &message)
             QByteArray message;
             in >> message;
 
-            QHash<QString, QDeclarativeDebugService *>::Iterator iter =
-                d->plugins.find(name);
-            if (iter == d->plugins.end()) {
-                qWarning() << "QDeclarativeDebugServer: Message received for missing plugin" << name;
+            if (d->waitingForMsgFromService == name) {
+                // deliver directly so that it is delivered before waitForMessage is returning.
+                d->_q_deliverMessage(name, message);
+                d->waitingForMsgFromService.clear();
             } else {
-                (*iter)->messageReceived(message);
+                // deliver message in next event loop run.
+                // Fixes the case that the service does start it's own event loop ...,
+                // but the networking code doesn't deliver any new messages because readyRead
+                // hasn't returned.
+                QMetaObject::invokeMethod(this, "_q_deliverMessage", Qt::QueuedConnection,
+                                          Q_ARG(QString, name),
+                                          Q_ARG(QByteArray, message));
             }
         }
     }
 }
 
+void QDeclarativeDebugServerPrivate::_q_deliverMessage(const QString &serviceName, const QByteArray &message)
+{
+    QHash<QString, QDeclarativeDebugService *>::Iterator iter = plugins.find(serviceName);
+    if (iter == plugins.end()) {
+        qWarning() << "QDeclarativeDebugServer: Message received for missing plugin" << serviceName;
+    } else {
+        (*iter)->messageReceived(message);
+    }
+}
+
 QList<QDeclarativeDebugService*> QDeclarativeDebugServer::services() const
 {
     const Q_D(QDeclarativeDebugServer);
@@ -374,4 +396,23 @@ void QDeclarativeDebugServer::sendMessage(QDeclarativeDebugService *service,
     d->connection->send(msg);
 }
 
+bool QDeclarativeDebugServer::waitForMessage(QDeclarativeDebugService *service)
+{
+    Q_D(QDeclarativeDebugServer);
+
+    if (!service
+            || !d->plugins.contains(service->name())
+            || !d->waitingForMsgFromService.isEmpty())
+        return false;
+
+    d->waitingForMsgFromService = service->name();
+
+    do {
+        d->connection->waitForMessage();
+    } while (!d->waitingForMsgFromService.isEmpty());
+    return true;
+}
+
 QT_END_NAMESPACE
+
+#include "moc_qdeclarativedebugserver_p.cpp"
diff --git a/src/declarative/debugger/qdeclarativedebugserver_p.h b/src/declarative/debugger/qdeclarativedebugserver_p.h
index 68ea4d8..72c664c 100644
--- a/src/declarative/debugger/qdeclarativedebugserver_p.h
+++ b/src/declarative/debugger/qdeclarativedebugserver_p.h
@@ -75,10 +75,13 @@ public:
     void sendMessage(QDeclarativeDebugService *service, const QByteArray &message);
     void receiveMessage(const QByteArray &message);
 
+    bool waitForMessage(QDeclarativeDebugService *service);
+
 private:
     friend class QDeclarativeDebugService;
     friend class QDeclarativeDebugServicePrivate;
     QDeclarativeDebugServer();
+    Q_PRIVATE_SLOT(d_func(), void _q_deliverMessage(QString, QByteArray))
 };
 
 QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativedebugserverconnection_p.h b/src/declarative/debugger/qdeclarativedebugserverconnection_p.h
index 0c2bdb4..ca267e0 100644
--- a/src/declarative/debugger/qdeclarativedebugserverconnection_p.h
+++ b/src/declarative/debugger/qdeclarativedebugserverconnection_p.h
@@ -62,6 +62,7 @@ public:
     virtual bool isConnected() const = 0;
     virtual void send(const QByteArray &message) = 0;
     virtual void disconnect() = 0;
+    virtual bool waitForMessage() = 0;
 };
 
 Q_DECLARE_INTERFACE(QDeclarativeDebugServerConnection, "com.trolltech.Qt.QDeclarativeDebugServerConnection/1.0")
diff --git a/src/declarative/debugger/qdeclarativedebugservice.cpp b/src/declarative/debugger/qdeclarativedebugservice.cpp
index 1b39f1c..c7e6615 100644
--- a/src/declarative/debugger/qdeclarativedebugservice.cpp
+++ b/src/declarative/debugger/qdeclarativedebugservice.cpp
@@ -209,6 +209,16 @@ void QDeclarativeDebugService::sendMessage(const QByteArray &message)
     d->server->sendMessage(this, message);
 }
 
+bool QDeclarativeDebugService::waitForMessage()
+{
+    Q_D(QDeclarativeDebugService);
+
+    if (status() != Enabled)
+        return false;
+
+    return d->server->waitForMessage(this);
+}
+
 void QDeclarativeDebugService::statusChanged(Status)
 {
 }
diff --git a/src/declarative/debugger/qdeclarativedebugservice_p.h b/src/declarative/debugger/qdeclarativedebugservice_p.h
index 5e30350..f3d1919 100644
--- a/src/declarative/debugger/qdeclarativedebugservice_p.h
+++ b/src/declarative/debugger/qdeclarativedebugservice_p.h
@@ -69,6 +69,7 @@ public:
     Status status() const;
 
     void sendMessage(const QByteArray &);
+    bool waitForMessage();
 
     static int idForObject(QObject *);
     static QObject *objectForId(int);
@@ -84,6 +85,7 @@ protected:
 
 private:
     friend class QDeclarativeDebugServer;
+    friend class QDeclarativeDebugServerPrivate;
 };
 
 QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativedebugtrace.cpp b/src/declarative/debugger/qdeclarativedebugtrace.cpp
index 6f28736..edbbe78 100644
--- a/src/declarative/debugger/qdeclarativedebugtrace.cpp
+++ b/src/declarative/debugger/qdeclarativedebugtrace.cpp
@@ -65,9 +65,14 @@ QByteArray QDeclarativeDebugData::toByteArray() const
 
 QDeclarativeDebugTrace::QDeclarativeDebugTrace()
 : QDeclarativeDebugService(QLatin1String("CanvasFrameRate")),
-  m_enabled(false), m_deferredSend(true)
+  m_enabled(false), m_deferredSend(true), m_messageReceived(false)
 {
     m_timer.start();
+    if (status() == Enabled) {
+        // wait for first message indicating whether to trace or not
+        while (!m_messageReceived)
+            waitForMessage();
+    }
 }
 
 void QDeclarativeDebugTrace::addEvent(EventType t)
@@ -213,6 +218,8 @@ void QDeclarativeDebugTrace::messageReceived(const QByteArray &message)
 
     stream >> m_enabled;
 
+    m_messageReceived = true;
+
     if (!m_enabled)
         sendMessages();
 }
diff --git a/src/declarative/debugger/qdeclarativedebugtrace_p.h b/src/declarative/debugger/qdeclarativedebugtrace_p.h
index ae0653e..c74cbe0 100644
--- a/src/declarative/debugger/qdeclarativedebugtrace_p.h
+++ b/src/declarative/debugger/qdeclarativedebugtrace_p.h
@@ -120,6 +120,7 @@ private:
     QPerformanceTimer m_timer;
     bool m_enabled;
     bool m_deferredSend;
+    bool m_messageReceived;
     QList<QDeclarativeDebugData> m_data;
 };
 
diff --git a/src/declarative/debugger/qdeclarativeobserverinterface_p.h b/src/declarative/debugger/qdeclarativeobserverinterface_p.h
new file mode 100644
index 0000000..501c132
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativeobserverinterface_p.h
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDECLARATIVEOBSERVERINTERFACE_H
+#define QDECLARATIVEOBSERVERINTERFACE_H
+
+#include <QtDeclarative/private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class Q_DECLARATIVE_EXPORT QDeclarativeObserverInterface
+{
+public:
+    QDeclarativeObserverInterface() {}
+    virtual ~QDeclarativeObserverInterface() {}
+
+    virtual void activate() = 0;
+    virtual void deactivate() = 0;
+};
+
+Q_DECLARE_INTERFACE(QDeclarativeObserverInterface, "com.trolltech.Qt.QDeclarativeObserverInterface/1.0")
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEOBSERVERINTERFACE_H
diff --git a/src/declarative/debugger/qdeclarativeobserverservice.cpp b/src/declarative/debugger/qdeclarativeobserverservice.cpp
new file mode 100644
index 0000000..a623c55
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativeobserverservice.cpp
@@ -0,0 +1,137 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qdeclarativeobserverservice_p.h"
+#include "private/qdeclarativeobserverinterface_p.h"
+
+#include <QtCore/QCoreApplication>
+#include <QtCore/QDebug>
+#include <QtCore/QDir>
+#include <QtCore/QPluginLoader>
+
+#include <QtDeclarative/QDeclarativeView>
+
+QT_BEGIN_NAMESPACE
+
+Q_GLOBAL_STATIC(QDeclarativeObserverService, serviceInstance)
+
+QDeclarativeObserverService::QDeclarativeObserverService()
+    : QDeclarativeDebugService(QLatin1String("QDeclarativeObserverMode"))
+    , m_observer(0)
+{
+}
+
+QDeclarativeObserverService *QDeclarativeObserverService::instance()
+{
+    return serviceInstance();
+}
+
+void QDeclarativeObserverService::addView(QDeclarativeView *view)
+{
+    m_views.append(view);
+}
+
+void QDeclarativeObserverService::removeView(QDeclarativeView *view)
+{
+    m_views.removeAll(view);
+}
+
+void QDeclarativeObserverService::sendMessage(const QByteArray &message)
+{
+    if (status() != Enabled)
+        return;
+
+    QDeclarativeDebugService::sendMessage(message);
+}
+
+void QDeclarativeObserverService::statusChanged(Status status)
+{
+    if (m_views.isEmpty())
+        return;
+
+    if (status == Enabled) {
+        if (!m_observer)
+            m_observer = loadObserverPlugin();
+
+        if (!m_observer) {
+            qWarning() << "Error while loading observer plugin";
+            return;
+        }
+
+        m_observer->activate();
+    } else {
+        if (m_observer)
+            m_observer->deactivate();
+    }
+}
+
+void QDeclarativeObserverService::messageReceived(const QByteArray &message)
+{
+    emit gotMessage(message);
+}
+
+QDeclarativeObserverInterface *QDeclarativeObserverService::loadObserverPlugin()
+{
+    QStringList pluginCandidates;
+    const QStringList paths = QCoreApplication::libraryPaths();
+    foreach (const QString &libPath, paths) {
+        const QDir dir(libPath + QLatin1String("/qmltooling"));
+        if (dir.exists())
+            foreach (const QString &pluginPath, dir.entryList(QDir::Files))
+                pluginCandidates << dir.absoluteFilePath(pluginPath);
+    }
+
+    foreach (const QString &pluginPath, pluginCandidates) {
+        QPluginLoader loader(pluginPath);
+        if (!loader.load())
+            continue;
+
+        QDeclarativeObserverInterface *observer =
+                qobject_cast<QDeclarativeObserverInterface*>(loader.instance());
+
+        if (observer)
+            return observer;
+        loader.unload();
+    }
+    return 0;
+}
+
+QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativeobserverservice_p.h b/src/declarative/debugger/qdeclarativeobserverservice_p.h
new file mode 100644
index 0000000..36f31dc
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativeobserverservice_p.h
@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDECLARATIVEOBSERVERSERVICE_H
+#define QDECLARATIVEOBSERVERSERVICE_H
+
+#include "private/qdeclarativedebugservice_p.h"
+#include <private/qdeclarativeglobal_p.h>
+
+#include <QtCore/QList>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeView;
+class QDeclarativeObserverInterface;
+
+class Q_DECLARATIVE_EXPORT QDeclarativeObserverService : public QDeclarativeDebugService
+{
+    Q_OBJECT
+
+public:
+    QDeclarativeObserverService();
+    static QDeclarativeObserverService *instance();
+
+    void addView(QDeclarativeView *);
+    void removeView(QDeclarativeView *);
+    QList<QDeclarativeView*> views() const { return m_views; }
+
+    void sendMessage(const QByteArray &message);
+
+Q_SIGNALS:
+    void gotMessage(const QByteArray &message);
+
+protected:
+    virtual void statusChanged(Status status);
+    virtual void messageReceived(const QByteArray &);
+
+private:
+    static QDeclarativeObserverInterface *loadObserverPlugin();
+
+    QList<QDeclarativeView*> m_views;
+    QDeclarativeObserverInterface *m_observer;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEOBSERVERSERVICE_H
diff --git a/src/declarative/debugger/qjsdebuggeragent.cpp b/src/declarative/debugger/qjsdebuggeragent.cpp
new file mode 100644
index 0000000..601c8c8
--- /dev/null
+++ b/src/declarative/debugger/qjsdebuggeragent.cpp
@@ -0,0 +1,576 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qjsdebuggeragent_p.h"
+#include "private/qdeclarativedebughelper_p.h"
+
+#include <QtCore/qdatetime.h>
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qset.h>
+#include <QtCore/qurl.h>
+#include <QtScript/qscriptcontextinfo.h>
+#include <QtScript/qscriptengine.h>
+#include <QtScript/qscriptvalueiterator.h>
+
+QT_BEGIN_NAMESPACE
+
+class QJSDebuggerAgentPrivate
+{
+public:
+    QJSDebuggerAgentPrivate(QJSDebuggerAgent *q)
+        : q(q), state(NoState)
+    {}
+
+    void continueExec();
+    void recordKnownObjects(const QList<JSAgentWatchData> &);
+    QList<JSAgentWatchData> getLocals(QScriptContext *);
+    void positionChange(qint64 scriptId, int lineNumber, int columnNumber);
+    QScriptEngine *engine() { return q->engine(); }
+    void stopped();
+
+public:
+    QJSDebuggerAgent *q;
+    JSDebuggerState state;
+    int stepDepth;
+    int stepCount;
+
+    QEventLoop loop;
+    QHash<qint64, QString> filenames;
+    JSAgentBreakpoints breakpoints;
+    // breakpoints by filename (without path)
+    QHash<QString, JSAgentBreakpointData> fileNameToBreakpoints;
+    QStringList watchExpressions;
+    QSet<qint64> knownObjectIds;
+};
+
+namespace {
+
+class SetupExecEnv
+{
+public:
+    SetupExecEnv(QJSDebuggerAgentPrivate *a)
+        : agent(a),
+          previousState(a->state),
+          hadException(a->engine()->hasUncaughtException())
+    {
+        agent->state = StoppedState;
+    }
+
+    ~SetupExecEnv()
+    {
+        if (!hadException && agent->engine()->hasUncaughtException())
+            agent->engine()->clearExceptions();
+        agent->state = previousState;
+    }
+
+private:
+    QJSDebuggerAgentPrivate *agent;
+    JSDebuggerState previousState;
+    bool hadException;
+};
+
+} // anonymous namespace
+
+static JSAgentWatchData fromScriptValue(const QString &expression,
+                                        const QScriptValue &value)
+{
+    static const QString arrayStr = QCoreApplication::translate
+            ("Debugger::JSAgentWatchData", "[Array of length %1]");
+    static const QString undefinedStr = QCoreApplication::translate
+            ("Debugger::JSAgentWatchData", "<undefined>");
+
+    JSAgentWatchData data;
+    data.exp = expression.toUtf8();
+    data.name = data.exp;
+    data.hasChildren = false;
+    data.value = value.toString().toUtf8();
+    data.objectId = value.objectId();
+    if (value.isArray()) {
+        data.type = "Array";
+        data.value = arrayStr.arg(value.property(QLatin1String("length")).toString()).toUtf8();
+        data.hasChildren = true;
+    } else if (value.isBool()) {
+        data.type = "Bool";
+        // data.value = value.toBool() ? "true" : "false";
+    } else if (value.isDate()) {
+        data.type = "Date";
+        data.value = value.toDateTime().toString().toUtf8();
+    } else if (value.isError()) {
+        data.type = "Error";
+    } else if (value.isFunction()) {
+        data.type = "Function";
+    } else if (value.isUndefined()) {
+        data.type = undefinedStr.toUtf8();
+    } else if (value.isNumber()) {
+        data.type = "Number";
+    } else if (value.isRegExp()) {
+        data.type = "RegExp";
+    } else if (value.isString()) {
+        data.type = "String";
+    } else if (value.isVariant()) {
+        data.type = "Variant";
+    } else if (value.isQObject()) {
+        const QObject *obj = value.toQObject();
+        data.type = "Object";
+        data.value += '[';
+        data.value += obj->metaObject()->className();
+        data.value += ']';
+        data.hasChildren = true;
+    } else if (value.isObject()) {
+        data.type = "Object";
+        data.hasChildren = true;
+        data.value = "[Object]";
+    } else if (value.isNull()) {
+        data.type = "<null>";
+    } else {
+        data.type = "<unknown>";
+    }
+    return data;
+}
+
+static QList<JSAgentWatchData> expandObject(const QScriptValue &object)
+{
+    QList<JSAgentWatchData> result;
+    QScriptValueIterator it(object);
+    while (it.hasNext()) {
+        it.next();
+        if (it.flags() & QScriptValue::SkipInEnumeration)
+            continue;
+        if (/*object.isQObject() &&*/ it.value().isFunction()) {
+            // Cosmetics: skip all functions and slot, there are too many of them,
+            // and it is not useful information in the debugger.
+            continue;
+        }
+        JSAgentWatchData data = fromScriptValue(it.name(), it.value());
+        result.append(data);
+    }
+    if (result.isEmpty()) {
+        JSAgentWatchData data;
+        data.name = "<no initialized data>";
+        data.hasChildren = false;
+        data.value = " ";
+        data.objectId = 0;
+        result.append(data);
+    }
+    return result;
+}
+
+static QString fileName(const QString &fileUrl)
+{
+    int lastDelimiterPos = fileUrl.lastIndexOf(QLatin1Char('/'));
+    return fileUrl.mid(lastDelimiterPos, fileUrl.size() - lastDelimiterPos);
+}
+
+void QJSDebuggerAgentPrivate::recordKnownObjects(const QList<JSAgentWatchData>& list)
+{
+    foreach (const JSAgentWatchData &data, list)
+        knownObjectIds << data.objectId;
+}
+
+QList<JSAgentWatchData> QJSDebuggerAgentPrivate::getLocals(QScriptContext *ctx)
+{
+    QList<JSAgentWatchData> locals;
+    if (ctx) {
+        QScriptValue activationObject = ctx->activationObject();
+        QScriptValue thisObject = ctx->thisObject();
+        locals = expandObject(activationObject);
+        if (thisObject.isObject()
+                && thisObject.objectId() != engine()->globalObject().objectId()
+                && QScriptValueIterator(thisObject).hasNext())
+            locals.prepend(fromScriptValue(QLatin1String("this"), thisObject));
+        recordKnownObjects(locals);
+        knownObjectIds << activationObject.objectId();
+    }
+    return locals;
+}
+
+/*!
+  Constructs a new agent for the given \a engine. The agent will
+  report debugging-related events (e.g. step completion) to the given
+  \a backend.
+*/
+QJSDebuggerAgent::QJSDebuggerAgent(QScriptEngine *engine, QObject *parent)
+    : QObject(parent)
+    , QScriptEngineAgent(engine)
+    , d(new QJSDebuggerAgentPrivate(this))
+{
+    QJSDebuggerAgent::engine()->setAgent(this);
+}
+
+QJSDebuggerAgent::QJSDebuggerAgent(QDeclarativeEngine *engine, QObject *parent)
+    : QObject(parent)
+    , QScriptEngineAgent(QDeclarativeDebugHelper::getScriptEngine(engine))
+    , d(new QJSDebuggerAgentPrivate(this))
+{
+    QJSDebuggerAgent::engine()->setAgent(this);
+}
+
+/*!
+  Destroys this QJSDebuggerAgent.
+*/
+QJSDebuggerAgent::~QJSDebuggerAgent()
+{
+    engine()->setAgent(0);
+    delete d;
+}
+
+void QJSDebuggerAgent::setBreakpoints(const JSAgentBreakpoints &breakpoints)
+{
+    d->breakpoints = breakpoints;
+
+    d->fileNameToBreakpoints.clear();
+    foreach (const JSAgentBreakpointData &bp, breakpoints)
+        d->fileNameToBreakpoints.insertMulti(fileName(QString::fromUtf8(bp.fileUrl)), bp);
+}
+
+void QJSDebuggerAgent::setWatchExpressions(const QStringList &watchExpressions)
+{
+    d->watchExpressions = watchExpressions;
+}
+
+void QJSDebuggerAgent::stepOver()
+{
+    d->stepDepth = 0;
+    d->state = SteppingOverState;
+    d->continueExec();
+}
+
+void QJSDebuggerAgent::stepInto()
+{
+    d->stepDepth = 0;
+    d->state = SteppingIntoState;
+    d->continueExec();
+}
+
+void QJSDebuggerAgent::stepOut()
+{
+    d->stepDepth = 0;
+    d->state = SteppingOutState;
+    d->continueExec();
+}
+
+void QJSDebuggerAgent::continueExecution()
+{
+    d->state = NoState;
+    d->continueExec();
+}
+
+JSAgentWatchData QJSDebuggerAgent::executeExpression(const QString &expr)
+{
+    SetupExecEnv execEnv(d);
+
+    JSAgentWatchData data = fromScriptValue(expr, engine()->evaluate(expr));
+    d->knownObjectIds << data.objectId;
+    return data;
+}
+
+QList<JSAgentWatchData> QJSDebuggerAgent::expandObjectById(quint64 objectId)
+{
+    SetupExecEnv execEnv(d);
+
+    QScriptValue v;
+    if (d->knownObjectIds.contains(objectId))
+        v = engine()->objectById(objectId);
+
+    QList<JSAgentWatchData> result = expandObject(v);
+    d->recordKnownObjects(result);
+    return result;
+}
+
+QList<JSAgentWatchData> QJSDebuggerAgent::locals()
+{
+    SetupExecEnv execEnv(d);
+    return d->getLocals(engine()->currentContext());
+}
+
+QList<JSAgentWatchData> QJSDebuggerAgent::localsAtFrame(int frameId)
+{
+    SetupExecEnv execEnv(d);
+
+    int deep = 0;
+    QScriptContext *ctx = engine()->currentContext();
+    while (ctx && deep < frameId) {
+        ctx = ctx->parentContext();
+        deep++;
+    }
+
+    return d->getLocals(ctx);
+}
+
+QList<JSAgentStackData> QJSDebuggerAgent::backtrace()
+{
+    SetupExecEnv execEnv(d);
+
+    QList<JSAgentStackData> backtrace;
+
+    for (QScriptContext *ctx = engine()->currentContext(); ctx; ctx = ctx->parentContext()) {
+        QScriptContextInfo info(ctx);
+
+        JSAgentStackData frame;
+        frame.functionName = info.functionName().toUtf8();
+        if (frame.functionName.isEmpty()) {
+            if (ctx->parentContext()) {
+                switch (info.functionType()) {
+                case QScriptContextInfo::ScriptFunction:
+                    frame.functionName = "<anonymous>";
+                    break;
+                case QScriptContextInfo::NativeFunction:
+                    frame.functionName = "<native>";
+                    break;
+                case QScriptContextInfo::QtFunction:
+                case QScriptContextInfo::QtPropertyFunction:
+                    frame.functionName = "<native slot>";
+                    break;
+                }
+            } else {
+                frame.functionName = "<global>";
+            }
+        }
+        frame.lineNumber = info.lineNumber();
+        // if the line number is unknown, fallback to the function line number
+        if (frame.lineNumber == -1)
+            frame.lineNumber = info.functionStartLineNumber();
+
+        frame.fileUrl = info.fileName().toUtf8();
+        backtrace.append(frame);
+    }
+
+    return backtrace;
+}
+
+QList<JSAgentWatchData> QJSDebuggerAgent::watches()
+{
+    SetupExecEnv execEnv(d);
+
+    QList<JSAgentWatchData> watches;
+    foreach (const QString &expr, d->watchExpressions)
+        watches << fromScriptValue(expr, engine()->evaluate(expr));
+    d->recordKnownObjects(watches);
+    return watches;
+}
+
+void QJSDebuggerAgent::setProperty(qint64 objectId,
+                                   const QString &property,
+                                   const QString &value)
+{
+    SetupExecEnv execEnv(d);
+
+    if (d->knownObjectIds.contains(objectId)) {
+        QScriptValue object = engine()->objectById(objectId);
+        if (object.isObject()) {
+            QScriptValue result = engine()->evaluate(value);
+            object.setProperty(property, result);
+        }
+    }
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::scriptLoad(qint64 id, const QString &program,
+                                  const QString &fileName, int)
+{
+    Q_UNUSED(program);
+    d->filenames.insert(id, fileName);
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::scriptUnload(qint64 id)
+{
+    d->filenames.remove(id);
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::contextPush()
+{
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::contextPop()
+{
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::functionEntry(qint64 scriptId)
+{
+    Q_UNUSED(scriptId);
+    d->stepDepth++;
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::functionExit(qint64 scriptId, const QScriptValue &returnValue)
+{
+    Q_UNUSED(scriptId);
+    Q_UNUSED(returnValue);
+    d->stepDepth--;
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::positionChange(qint64 scriptId, int lineNumber, int columnNumber)
+{
+    d->positionChange(scriptId, lineNumber, columnNumber);
+}
+
+void QJSDebuggerAgentPrivate::positionChange(qint64 scriptId, int lineNumber, int columnNumber)
+{
+    Q_UNUSED(columnNumber);
+
+    if (state == StoppedState)
+        return; //no re-entrency
+
+    // check breakpoints
+    if (!breakpoints.isEmpty()) {
+        QHash<qint64, QString>::const_iterator it = filenames.constFind(scriptId);
+        QScriptContext *ctx = engine()->currentContext();
+        QScriptContextInfo info(ctx);
+        if (it == filenames.constEnd()) {
+            // It is possible that the scripts are loaded before the agent is attached
+            QString filename = info.fileName();
+
+            JSAgentStackData frame;
+            frame.functionName = info.functionName().toUtf8();
+
+            QPair<QString, qint32> key = qMakePair(filename, lineNumber);
+            it = filenames.insert(scriptId, filename);
+        }
+
+        const QString filePath = it.value();
+        JSAgentBreakpoints bps = fileNameToBreakpoints.values(fileName(filePath)).toSet();
+
+        foreach (const JSAgentBreakpointData &bp, bps) {
+            if (bp.lineNumber == lineNumber) {
+                stopped();
+                return;
+            }
+        }
+    }
+
+    switch (state) {
+    case NoState:
+    case StoppedState:
+        // Do nothing
+        break;
+    case SteppingOutState:
+        if (stepDepth >= 0)
+            break;
+        //fallthough
+    case SteppingOverState:
+        if (stepDepth > 0)
+            break;
+        //fallthough
+    case SteppingIntoState:
+        stopped();
+        break;
+    }
+
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::exceptionThrow(qint64 scriptId,
+                                     const QScriptValue &exception,
+                                     bool hasHandler)
+{
+    Q_UNUSED(scriptId);
+    Q_UNUSED(exception);
+    Q_UNUSED(hasHandler);
+//    qDebug() << Q_FUNC_INFO << exception.toString() << hasHandler;
+#if 0 //sometimes, we get exceptions that we should just ignore.
+    if (!hasHandler && state != StoppedState)
+        stopped(true, exception);
+#endif
+}
+
+/*!
+  \reimp
+*/
+void QJSDebuggerAgent::exceptionCatch(qint64 scriptId, const QScriptValue &exception)
+{
+    Q_UNUSED(scriptId);
+    Q_UNUSED(exception);
+}
+
+bool QJSDebuggerAgent::supportsExtension(Extension extension) const
+{
+    return extension == QScriptEngineAgent::DebuggerInvocationRequest;
+}
+
+QVariant QJSDebuggerAgent::extension(Extension extension, const QVariant &argument)
+{
+    if (extension == QScriptEngineAgent::DebuggerInvocationRequest) {
+        d->stopped();
+        return QVariant();
+    }
+    return QScriptEngineAgent::extension(extension, argument);
+}
+
+void QJSDebuggerAgentPrivate::stopped()
+{
+    bool becauseOfException = false;
+    const QScriptValue &exception = QScriptValue();
+
+    knownObjectIds.clear();
+    state = StoppedState;
+
+    emit q->stopped(becauseOfException, exception.toString());
+
+    loop.exec(QEventLoop::ExcludeUserInputEvents);
+}
+
+void QJSDebuggerAgentPrivate::continueExec()
+{
+    loop.quit();
+}
+
+QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qjsdebuggeragent_p.h b/src/declarative/debugger/qjsdebuggeragent_p.h
new file mode 100644
index 0000000..ce5a044
--- /dev/null
+++ b/src/declarative/debugger/qjsdebuggeragent_p.h
@@ -0,0 +1,204 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QJSDEBUGGERAGENT_P_H
+#define QJSDEBUGGERAGENT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtScript/qscriptengineagent.h>
+#include <QtCore/qset.h>
+
+QT_BEGIN_NAMESPACE
+class QScriptValue;
+class QDeclarativeEngine;
+QT_END_NAMESPACE
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QJSDebuggerAgentPrivate;
+
+enum JSDebuggerState
+{
+    NoState,
+    SteppingIntoState,
+    SteppingOverState,
+    SteppingOutState,
+    StoppedState
+};
+
+struct JSAgentWatchData
+{
+    QByteArray exp;
+    QByteArray name;
+    QByteArray value;
+    QByteArray type;
+    bool hasChildren;
+    quint64 objectId;
+};
+
+inline QDataStream &operator<<(QDataStream &s, const JSAgentWatchData &data)
+{
+    return s << data.exp << data.name << data.value
+             << data.type << data.hasChildren << data.objectId;
+}
+
+struct JSAgentStackData
+{
+    QByteArray functionName;
+    QByteArray fileUrl;
+    qint32 lineNumber;
+};
+
+inline QDataStream &operator<<(QDataStream &s, const JSAgentStackData &data)
+{
+    return s << data.functionName << data.fileUrl << data.lineNumber;
+}
+
+struct JSAgentBreakpointData
+{
+    QByteArray functionName;
+    QByteArray fileUrl;
+    qint32 lineNumber;
+};
+
+typedef QSet<JSAgentBreakpointData> JSAgentBreakpoints;
+
+inline QDataStream &operator<<(QDataStream &s, const JSAgentBreakpointData &data)
+{
+    return s << data.functionName << data.fileUrl << data.lineNumber;
+}
+
+inline QDataStream &operator>>(QDataStream &s, JSAgentBreakpointData &data)
+{
+    return s >> data.functionName >> data.fileUrl >> data.lineNumber;
+}
+
+inline bool operator==(const JSAgentBreakpointData &b1, const JSAgentBreakpointData &b2)
+{
+    return b1.lineNumber == b2.lineNumber && b1.fileUrl == b2.fileUrl;
+}
+
+inline uint qHash(const JSAgentBreakpointData &b)
+{
+    return b.lineNumber ^ qHash(b.fileUrl);
+}
+
+
+class QJSDebuggerAgent : public QObject, public QScriptEngineAgent
+{
+    Q_OBJECT
+
+public:
+    QJSDebuggerAgent(QScriptEngine *engine, QObject *parent = 0);
+    QJSDebuggerAgent(QDeclarativeEngine *engine, QObject *parent = 0);
+    ~QJSDebuggerAgent();
+
+    void setBreakpoints(const JSAgentBreakpoints &);
+    void setWatchExpressions(const QStringList &);
+
+    void stepOver();
+    void stepInto();
+    void stepOut();
+    void continueExecution();
+
+    JSAgentWatchData executeExpression(const QString &expr);
+    QList<JSAgentWatchData> expandObjectById(quint64 objectId);
+    QList<JSAgentWatchData> locals();
+    QList<JSAgentWatchData> localsAtFrame(int frameId);
+    QList<JSAgentStackData> backtrace();
+    QList<JSAgentWatchData> watches();
+    void setProperty(qint64 objectId,
+                     const QString &property,
+                     const QString &value);
+
+    // reimplemented
+    void scriptLoad(qint64 id, const QString &program,
+                    const QString &fileName, int baseLineNumber);
+    void scriptUnload(qint64 id);
+
+    void contextPush();
+    void contextPop();
+
+    void functionEntry(qint64 scriptId);
+    void functionExit(qint64 scriptId,
+                      const QScriptValue &returnValue);
+
+    void positionChange(qint64 scriptId,
+                        int lineNumber, int columnNumber);
+
+    void exceptionThrow(qint64 scriptId,
+                        const QScriptValue &exception,
+                        bool hasHandler);
+    void exceptionCatch(qint64 scriptId,
+                        const QScriptValue &exception);
+
+    bool supportsExtension(Extension extension) const;
+    QVariant extension(Extension extension,
+                       const QVariant &argument = QVariant());
+
+Q_SIGNALS:
+    void stopped(bool becauseOfException,
+                 const QString &exception);
+
+private:
+    friend class QJSDebuggerAgentPrivate;
+    QJSDebuggerAgentPrivate *d;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QJSDEBUGGERAGENT_P_H
diff --git a/src/declarative/debugger/qjsdebugservice.cpp b/src/declarative/debugger/qjsdebugservice.cpp
new file mode 100644
index 0000000..f8cd095
--- /dev/null
+++ b/src/declarative/debugger/qjsdebugservice.cpp
@@ -0,0 +1,198 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qjsdebugservice_p.h"
+#include "private/qjsdebuggeragent_p.h"
+
+#include <QtCore/qdatastream.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qstringlist.h>
+#include <QtDeclarative/qdeclarativeengine.h>
+
+Q_GLOBAL_STATIC(QJSDebugService, serviceInstance)
+
+QJSDebugService::QJSDebugService(QObject *parent)
+    : QDeclarativeDebugService(QLatin1String("JSDebugger"), parent)
+    , m_agent(0)
+{
+}
+
+QJSDebugService::~QJSDebugService()
+{
+    delete m_agent;
+}
+
+QJSDebugService *QJSDebugService::instance()
+{
+    return serviceInstance();
+}
+
+void QJSDebugService::addEngine(QDeclarativeEngine *engine)
+{
+    Q_ASSERT(engine);
+    Q_ASSERT(!m_engines.contains(engine));
+
+    m_engines.append(engine);
+}
+
+void QJSDebugService::removeEngine(QDeclarativeEngine *engine)
+{
+    Q_ASSERT(engine);
+    Q_ASSERT(m_engines.contains(engine));
+
+    m_engines.removeAll(engine);
+}
+
+void QJSDebugService::statusChanged(Status status)
+{
+    if (status == Enabled && !m_engines.isEmpty() && !m_agent) {
+        // Multiple engines are currently unsupported
+        QDeclarativeEngine *engine = m_engines.first();
+        m_agent = new QJSDebuggerAgent(engine, engine);
+
+        connect(m_agent, SIGNAL(stopped(bool,QString)),
+                this, SLOT(executionStopped(bool,QString)));
+
+    } else if (status != Enabled && m_agent) {
+        delete m_agent;
+        m_agent = 0;
+    }
+}
+
+void QJSDebugService::messageReceived(const QByteArray &message)
+{
+    if (!m_agent) {
+        qWarning() << "QJSDebugService::messageReceived: No QJSDebuggerAgent available";
+        return;
+    }
+
+    QDataStream ds(message);
+    QByteArray command;
+    ds >> command;
+    if (command == "BREAKPOINTS") {
+        JSAgentBreakpoints breakpoints;
+        ds >> breakpoints;
+        m_agent->setBreakpoints(breakpoints);
+
+        //qDebug() << "BREAKPOINTS";
+        //foreach (const JSAgentBreakpointData &bp, breakpoints)
+        //    qDebug() << "BREAKPOINT: " << bp.fileUrl << bp.lineNumber;
+    } else if (command == "WATCH_EXPRESSIONS") {
+        QStringList watchExpressions;
+        ds >> watchExpressions;
+        m_agent->setWatchExpressions(watchExpressions);
+    } else if (command == "STEPOVER") {
+        m_agent->stepOver();
+    } else if (command == "STEPINTO" || command == "INTERRUPT") {
+        m_agent->stepInto();
+    } else if (command == "STEPOUT") {
+        m_agent->stepOut();
+    } else if (command == "CONTINUE") {
+        m_agent->continueExecution();
+    } else if (command == "EXEC") {
+        QByteArray id;
+        QString expr;
+        ds >> id >> expr;
+
+        JSAgentWatchData data = m_agent->executeExpression(expr);
+
+        QByteArray reply;
+        QDataStream rs(&reply, QIODevice::WriteOnly);
+        rs << QByteArray("RESULT") << id << data;
+        sendMessage(reply);
+    } else if (command == "EXPAND") {
+        QByteArray requestId;
+        quint64 objectId;
+        ds >> requestId >> objectId;
+
+        QList<JSAgentWatchData> result = m_agent->expandObjectById(objectId);
+
+        QByteArray reply;
+        QDataStream rs(&reply, QIODevice::WriteOnly);
+        rs << QByteArray("EXPANDED") << requestId << result;
+        sendMessage(reply);
+    } else if (command == "ACTIVATE_FRAME") {
+        int frameId;
+        ds >> frameId;
+
+        QList<JSAgentWatchData> locals = m_agent->localsAtFrame(frameId);
+
+        QByteArray reply;
+        QDataStream rs(&reply, QIODevice::WriteOnly);
+        rs << QByteArray("LOCALS") << frameId << locals;
+        sendMessage(reply);
+    } else if (command == "SET_PROPERTY") {
+        QByteArray id;
+        qint64 objectId;
+        QString property;
+        QString value;
+        ds >> id >> objectId >> property >> value;
+
+        m_agent->setProperty(objectId, property, value);
+
+        //TODO: feedback
+    } else if (command == "PING") {
+        int ping;
+        ds >> ping;
+        QByteArray reply;
+        QDataStream rs(&reply, QIODevice::WriteOnly);
+        rs << QByteArray("PONG") << ping;
+        sendMessage(reply);
+    } else {
+        qDebug() << Q_FUNC_INFO << "Unknown command" << command;
+    }
+
+    QDeclarativeDebugService::messageReceived(message);
+}
+
+void QJSDebugService::executionStopped(bool becauseOfException,
+                                       const QString &exception)
+{
+    const QList<JSAgentStackData> backtrace = m_agent->backtrace();
+    const QList<JSAgentWatchData> watches = m_agent->watches();
+    const QList<JSAgentWatchData> locals = m_agent->locals();
+
+    QByteArray reply;
+    QDataStream rs(&reply, QIODevice::WriteOnly);
+    rs << QByteArray("STOPPED") << backtrace << watches << locals
+       << becauseOfException << exception;
+    sendMessage(reply);
+}
diff --git a/src/declarative/debugger/qjsdebugservice_p.h b/src/declarative/debugger/qjsdebugservice_p.h
new file mode 100644
index 0000000..6839ca8
--- /dev/null
+++ b/src/declarative/debugger/qjsdebugservice_p.h
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QJSDEBUGSERVICE_P_H
+#define QJSDEBUGSERVICE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QPointer>
+
+#include "private/qdeclarativedebugservice_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeEngine;
+class QJSDebuggerAgent;
+
+class QJSDebugService : public QDeclarativeDebugService
+{
+    Q_OBJECT
+
+public:
+    QJSDebugService(QObject *parent = 0);
+    ~QJSDebugService();
+
+    static QJSDebugService *instance();
+
+    void addEngine(QDeclarativeEngine *);
+    void removeEngine(QDeclarativeEngine *);
+
+protected:
+    void statusChanged(Status status);
+    void messageReceived(const QByteArray &);
+
+private Q_SLOTS:
+    void executionStopped(bool becauseOfException,
+                          const QString &exception);
+
+private:
+    QList<QDeclarativeEngine *> m_engines;
+    QPointer<QJSDebuggerAgent> m_agent;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QJSDEBUGSERVICE_P_H
diff --git a/src/declarative/debugger/qpacketprotocol.cpp b/src/declarative/debugger/qpacketprotocol.cpp
index 15a14cf..c1034a7 100644
--- a/src/declarative/debugger/qpacketprotocol.cpp
+++ b/src/declarative/debugger/qpacketprotocol.cpp
@@ -42,6 +42,7 @@
 #include "private/qpacketprotocol_p.h"
 
 #include <QBuffer>
+#include <QElapsedTimer>
 
 QT_BEGIN_NAMESPACE
 
@@ -114,7 +115,7 @@ Q_OBJECT
 public:
     QPacketProtocolPrivate(QPacketProtocol * parent, QIODevice * _dev)
     : QObject(parent), inProgressSize(-1), maxPacketSize(MAX_PACKET_SIZE),
-      dev(_dev)
+      waitingForPacket(false), dev(_dev)
     {
         Q_ASSERT(4 == sizeof(qint32));
 
@@ -125,7 +126,7 @@ public:
         QObject::connect(this, SIGNAL(invalidPacket()),
                          parent, SIGNAL(invalidPacket()));
         QObject::connect(dev, SIGNAL(readyRead()),
-                         this, SLOT(readyToRead()), Qt::QueuedConnection);
+                         this, SLOT(readyToRead()));
         QObject::connect(dev, SIGNAL(aboutToClose()),
                          this, SLOT(aboutToClose()));
         QObject::connect(dev, SIGNAL(bytesWritten(qint64)),
@@ -200,6 +201,7 @@ public Q_SLOTS:
                 inProgress.clear();
 
                 emit readyRead();
+                waitingForPacket = false;
 
                 // Need to get trailing data
                 readyToRead();
@@ -213,6 +215,7 @@ public:
     QByteArray inProgress;
     qint32 inProgressSize;
     qint32 maxPacketSize;
+    bool waitingForPacket;
     QIODevice * dev;
 };
 
@@ -324,6 +327,48 @@ QPacket QPacketProtocol::read()
     return rv;
 }
 
+/*
+   Returns the difference between msecs and elapsed. If msecs is -1,
+   however, -1 is returned.
+*/
+static int qt_timeout_value(int msecs, int elapsed)
+{
+    if (msecs == -1)
+        return -1;
+
+    int timeout = msecs - elapsed;
+    return timeout < 0 ? 0 : timeout;
+}
+
+/*!
+  This function locks until a new packet is available for reading and the
+  \l{QIODevice::}{readyRead()} signal has been emitted. The function
+  will timeout after \a msecs milliseconds; the default timeout is
+  30000 milliseconds.
+
+  The function returns true if the readyRead() signal is emitted and
+  there is new data available for reading; otherwise it returns false
+  (if an error occurred or the operation timed out).
+  */
+
+bool QPacketProtocol::waitForReadyRead(int msecs)
+{
+    if (!d->packets.isEmpty())
+        return true;
+
+    QElapsedTimer stopWatch;
+    stopWatch.start();
+
+    d->waitingForPacket = true;
+    do {
+        if (!d->dev->waitForReadyRead(msecs))
+            return false;
+        if (!d->waitingForPacket)
+            return true;
+        msecs = qt_timeout_value(msecs, stopWatch.elapsed());
+    } while (true);
+}
+
 /*!
   Return the QIODevice passed to the QPacketProtocol constructor.
 */
diff --git a/src/declarative/debugger/qpacketprotocol_p.h b/src/declarative/debugger/qpacketprotocol_p.h
index accb8ef..22bc3c2 100644
--- a/src/declarative/debugger/qpacketprotocol_p.h
+++ b/src/declarative/debugger/qpacketprotocol_p.h
@@ -75,6 +75,8 @@ public:
     qint64 packetsAvailable() const;
     QPacket read();
 
+    bool waitForReadyRead(int msecs = 3000);
+
     void clear();
 
     QIODevice * device();
diff --git a/src/declarative/qml/qdeclarative.h b/src/declarative/qml/qdeclarative.h
index 5da7901..28a6be4 100644
--- a/src/declarative/qml/qdeclarative.h
+++ b/src/declarative/qml/qdeclarative.h
@@ -405,6 +405,17 @@ QObject *qmlAttachedPropertiesObject(const QObject *obj, bool create = true)
     return qmlAttachedPropertiesObject(&idx, obj, &T::staticMetaObject, create);
 }
 
+// Enable debugging before any QDeclarativeEngine is created
+struct Q_DECLARATIVE_EXPORT QDeclarativeDebuggingEnabler
+{
+    QDeclarativeDebuggingEnabler();
+};
+
+// Execute code in constructor before first QDeclarativeEngine is instantiated
+#if defined(QT_DECLARATIVE_DEBUG)
+static QDeclarativeDebuggingEnabler qmlEnableDebuggingHelper;
+#endif
+
 QT_END_NAMESPACE
 
 QML_DECLARE_TYPE(QObject)
diff --git a/src/declarative/qml/qdeclarativeengine.cpp b/src/declarative/qml/qdeclarativeengine.cpp
index 9fde18c..aa4bcd4 100644
--- a/src/declarative/qml/qdeclarativeengine.cpp
+++ b/src/declarative/qml/qdeclarativeengine.cpp
@@ -71,6 +71,7 @@
 #include "private/qdeclarativenotifier_p.h"
 #include "private/qdeclarativedebugtrace_p.h"
 #include "private/qdeclarativeapplication_p.h"
+#include "private/qjsdebugservice_p.h"
 
 #include <QtCore/qmetaobject.h>
 #include <QScriptClass>
@@ -123,7 +124,7 @@ QT_BEGIN_NAMESPACE
   \brief The QtObject element is the most basic element in QML.
 
   The QtObject element is a non-visual element which contains only the
-  objectName property. 
+  objectName property.
 
   It can be useful to create a QtObject if you need an extremely
   lightweight element to enclose a set of custom properties:
@@ -138,7 +139,7 @@ QT_BEGIN_NAMESPACE
   This property holds the QObject::objectName for this specific object instance.
 
   This allows a C++ application to locate an item within a QML component
-  using the QObject::findChild() method. For example, the following C++ 
+  using the QObject::findChild() method. For example, the following C++
   application locates the child \l Rectangle item and dynamically changes its
   \c color value:
 
@@ -152,7 +153,7 @@ QT_BEGIN_NAMESPACE
 
         Rectangle {
             anchors.fill: parent
-            color: "red" 
+            color: "red"
             objectName: "myRect"
         }
     }
@@ -166,7 +167,7 @@ QT_BEGIN_NAMESPACE
     view.show();
 
     QDeclarativeItem *item = view.rootObject()->findChild<QDeclarativeItem*>("myRect");
-    if (item) 
+    if (item)
         item->setProperty("color", QColor(Qt::yellow));
     \endcode
 */
@@ -202,7 +203,7 @@ void QDeclarativeEnginePrivate::defineModule()
 
 \keyword QmlGlobalQtObject
 
-\brief The \c Qt object provides useful enums and functions from Qt, for use in all QML files. 
+\brief The \c Qt object provides useful enums and functions from Qt, for use in all QML files.
 
 The \c Qt object is a global object with utility functions, properties and enums.
 
@@ -583,6 +584,7 @@ void QDeclarativeEnginePrivate::init()
         QDeclarativeEngineDebugServer::isDebuggingEnabled()) {
         isDebugging = true;
         QDeclarativeEngineDebugServer::instance()->addEngine(q);
+        QJSDebugService::instance()->addEngine(q);
     }
 }
 
@@ -645,8 +647,10 @@ QDeclarativeEngine::QDeclarativeEngine(QObject *parent)
 QDeclarativeEngine::~QDeclarativeEngine()
 {
     Q_D(QDeclarativeEngine);
-    if (d->isDebugging)
+    if (d->isDebugging) {
         QDeclarativeEngineDebugServer::instance()->remEngine(this);
+        QJSDebugService::instance()->removeEngine(this);
+    }
 }
 
 /*! \fn void QDeclarativeEngine::quit()
@@ -757,7 +761,7 @@ QNetworkAccessManager *QDeclarativeEngine::networkAccessManager() const
 /*!
 
   Sets the \a provider to use for images requested via the \e
-  image: url scheme, with host \a providerId. The QDeclarativeEngine 
+  image: url scheme, with host \a providerId. The QDeclarativeEngine
   takes ownership of \a provider.
 
   Image providers enable support for pixmap and threaded image
@@ -1066,7 +1070,7 @@ QObject *qmlAttachedPropertiesObjectById(int id, const QObject *object, bool cre
 
     rv = pf(const_cast<QObject *>(object));
 
-    if (rv) 
+    if (rv)
         data->attachedProperties()->insert(id, rv);
 
     return rv;
@@ -1084,6 +1088,17 @@ QObject *qmlAttachedPropertiesObject(int *idCache, const QObject *object,
     return qmlAttachedPropertiesObjectById(*idCache, object, create);
 }
 
+QDeclarativeDebuggingEnabler::QDeclarativeDebuggingEnabler()
+{
+#ifndef QDECLARATIVE_NO_DEBUG_PROTOCOL
+    if (!QDeclarativeEnginePrivate::qml_debugging_enabled) {
+        qWarning("Qml debugging is enabled. Only use this in a safe environment!");
+    }
+    QDeclarativeEnginePrivate::qml_debugging_enabled = true;
+#endif
+}
+
+
 class QDeclarativeDataExtended {
 public:
     QDeclarativeDataExtended();
@@ -1258,7 +1273,7 @@ Returns a \l Component object created using the QML file at the specified \a url
 or \c null if an empty string was given.
 
 The returned component's \l Component::status property indicates whether the
-component was successfully created. If the status is \c Component.Error, 
+component was successfully created. If the status is \c Component.Error,
 see \l Component::errorString() for an error description.
 
 Call \l {Component::createObject()}{Component.createObject()} on the returned
@@ -1311,6 +1326,8 @@ Example (where \c parentItem is the id of an existing QML item):
 In the case of an error, a QtScript Error object is thrown. This object has an additional property,
 \c qmlErrors, which is an array of the errors encountered.
 Each object in this array has the members \c lineNumber, \c columnNumber, \c fileName and \c message.
+For example, if the above snippet had misspelled color as 'colro' then the array would contain an object like the following:
+{ "lineNumber" : 1, "columnNumber" : 32, "fileName" : "dynamicSnippet1", "message" : "Cannot assign to non-existent property \"colro\""}.
 
 Note that this function returns immediately, and therefore may not work if
 the \a qml string loads new components (that is, external QML files that have not yet been loaded).
@@ -1618,7 +1635,7 @@ QScriptValue QDeclarativeEnginePrivate::formatDateTime(QScriptContext*ctxt, QScr
             return engine->newVariant(QVariant::fromValue(date.toString(format)));
         } else if (formatArg.isNumber()) {
             enumFormat = Qt::DateFormat(formatArg.toUInt32());
-        } else { 
+        } else {
             return ctxt->throwError(QLatin1String("Qt.formatDateTime(): Invalid datetime format"));
         }
     }
@@ -1683,7 +1700,7 @@ QScriptValue QDeclarativeEnginePrivate::hsla(QScriptContext *ctxt, QScriptEngine
 }
 
 /*!
-\qmlmethod rect Qt::rect(int x, int y, int width, int height) 
+\qmlmethod rect Qt::rect(int x, int y, int width, int height)
 
 Returns a \c rect with the top-left corner at \c x, \c y and the specified \c width and \c height.
 
@@ -1855,7 +1872,7 @@ Binary to ASCII - this function returns a base64 encoding of \c data.
 */
 QScriptValue QDeclarativeEnginePrivate::btoa(QScriptContext *ctxt, QScriptEngine *)
 {
-    if (ctxt->argumentCount() != 1) 
+    if (ctxt->argumentCount() != 1)
         return ctxt->throwError(QLatin1String("Qt.btoa(): Invalid arguments"));
 
     QByteArray data = ctxt->argument(0).toString().toUtf8();
@@ -1870,7 +1887,7 @@ ASCII to binary - this function returns a base64 decoding of \c data.
 
 QScriptValue QDeclarativeEnginePrivate::atob(QScriptContext *ctxt, QScriptEngine *)
 {
-    if (ctxt->argumentCount() != 1) 
+    if (ctxt->argumentCount() != 1)
         return ctxt->throwError(QLatin1String("Qt.atob(): Invalid arguments"));
 
     QByteArray data = ctxt->argument(0).toString().toUtf8();
@@ -2289,7 +2306,7 @@ QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(const QMetaObj
     }
 }
 
-QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(QDeclarativeType *type, int minorVersion, 
+QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(QDeclarativeType *type, int minorVersion,
                                                                   QDeclarativeError &error)
 {
     QList<QDeclarativeType *> types;
@@ -2298,7 +2315,7 @@ QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(QDeclarativeTy
 
     const QMetaObject *metaObject = type->metaObject();
     while (metaObject) {
-        QDeclarativeType *t = QDeclarativeMetaType::qmlType(metaObject, type->module(), 
+        QDeclarativeType *t = QDeclarativeMetaType::qmlType(metaObject, type->module(),
                                                             type->majorVersion(), minorVersion);
         if (t) {
             maxMinorVersion = qMax(maxMinorVersion, t->minorVersion());
@@ -2342,7 +2359,7 @@ QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(QDeclarativeTy
 
     // Signals override:
     //    * other signals and methods of the same name.
-    //    * properties named on<Signal Name> 
+    //    * properties named on<Signal Name>
     //    * automatic <property name>Changed notify signals
 
     // Methods override:
@@ -2367,7 +2384,7 @@ QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(QDeclarativeTy
         QDeclarativePropertyCache::Data *current = d;
         while (!overloadError && current) {
             current = d->overrideData(current);
-            if (current && raw->isAllowedInRevision(current)) 
+            if (current && raw->isAllowedInRevision(current))
                 overloadError = true;
         }
     }
@@ -2375,7 +2392,7 @@ QDeclarativePropertyCache *QDeclarativeEnginePrivate::createCache(QDeclarativeTy
 
     if (overloadError) {
         if (hasCopied) raw->release();
-            
+
         error.setDescription(QLatin1String("Type ") + QString::fromUtf8(type->qmlTypeName()) + QLatin1String(" ") + QString::number(type->majorVersion()) + QLatin1String(".") + QString::number(minorVersion) + QLatin1String(" contains an illegal property \"") + overloadName + QLatin1String("\".  This is an error in the type's implementation."));
         return 0;
     }
diff --git a/src/declarative/qml/qdeclarativeengine_p.h b/src/declarative/qml/qdeclarativeengine_p.h
index 88b4e80..fd851f7 100644
--- a/src/declarative/qml/qdeclarativeengine_p.h
+++ b/src/declarative/qml/qdeclarativeengine_p.h
@@ -95,7 +95,6 @@ class QDeclarativeImportDatabase;
 class QDeclarativeObjectScriptClass;
 class QDeclarativeTypeNameScriptClass;
 class QDeclarativeValueTypeScriptClass;
-class QScriptEngineDebugger;
 class QNetworkReply;
 class QNetworkAccessManager;
 class QDeclarativeNetworkAccessManagerFactory;
@@ -332,14 +331,14 @@ public:
 /*!
 Returns a QDeclarativePropertyCache for \a obj if one is available.
 
-If \a obj is null, being deleted or contains a dynamic meta object 0 
+If \a obj is null, being deleted or contains a dynamic meta object 0
 is returned.
 
 The returned cache is not referenced, so if it is to be stored, call addref().
 */
-QDeclarativePropertyCache *QDeclarativeEnginePrivate::cache(QObject *obj) 
+QDeclarativePropertyCache *QDeclarativeEnginePrivate::cache(QObject *obj)
 {
-    if (!obj || QObjectPrivate::get(obj)->metaObject || QObjectPrivate::get(obj)->wasDeleted) 
+    if (!obj || QObjectPrivate::get(obj)->metaObject || QObjectPrivate::get(obj)->wasDeleted)
         return 0;
 
     const QMetaObject *mo = obj->metaObject();
@@ -349,10 +348,10 @@ QDeclarativePropertyCache *QDeclarativeEnginePrivate::cache(QObject *obj)
 }
 
 /*!
-Returns a QDeclarativePropertyCache for \a metaObject.  
+Returns a QDeclarativePropertyCache for \a metaObject.
 
 As the cache is persisted for the life of the engine, \a metaObject must be
-a static "compile time" meta-object, or a meta-object that is otherwise known to 
+a static "compile time" meta-object, or a meta-object that is otherwise known to
 exist for the lifetime of the QDeclarativeEngine.
 
 The returned cache is not referenced, so if it is to be stored, call addref().
diff --git a/src/declarative/qml/qdeclarativeenginedebug.cpp b/src/declarative/qml/qdeclarativeenginedebug.cpp
index b2a05c3..b7b88c9 100644
--- a/src/declarative/qml/qdeclarativeenginedebug.cpp
+++ b/src/declarative/qml/qdeclarativeenginedebug.cpp
@@ -524,8 +524,13 @@ void QDeclarativeEngineDebugServer::messageReceived(const QByteArray &message)
         QString propertyName;
         QVariant expr;
         bool isLiteralValue;
+        QString filename;
+        int line;
         ds >> objectId >> propertyName >> expr >> isLiteralValue;
-        setBinding(objectId, propertyName, expr, isLiteralValue);
+        if (!ds.atEnd()) { // backward compatibility from 2.1, 2.2
+            ds >> filename >> line;
+        }
+        setBinding(objectId, propertyName, expr, isLiteralValue, filename, line);
     } else if (type == "RESET_BINDING") {
         int objectId;
         QString propertyName;
@@ -543,7 +548,9 @@ void QDeclarativeEngineDebugServer::messageReceived(const QByteArray &message)
 void QDeclarativeEngineDebugServer::setBinding(int objectId,
                                                const QString &propertyName,
                                                const QVariant &expression,
-                                               bool isLiteralValue)
+                                               bool isLiteralValue,
+                                               QString filename,
+                                               int line)
 {
     QObject *object = objectForId(objectId);
     QDeclarativeContext *context = qmlContext(object);
@@ -565,6 +572,7 @@ void QDeclarativeEngineDebugServer::setBinding(int objectId,
                             newBinding = new QDeclarativeBinding(expression.toString(), object, context);
                             newBinding->setTarget(property);
                             newBinding->setNotifyOnValueChanged(true);
+                            newBinding->setSourceLocation(filename, line);
                         }
 
                         state->changeBindingInRevertList(object, propertyName, newBinding);
@@ -580,11 +588,12 @@ void QDeclarativeEngineDebugServer::setBinding(int objectId,
                     property.write(expression);
                 } else if (hasValidSignal(object, propertyName)) {
                     QDeclarativeExpression *declarativeExpression = new QDeclarativeExpression(context, object, expression.toString());
-                    QDeclarativeExpression *oldExpression = QDeclarativePropertyPrivate::setSignalExpression(property, declarativeExpression);
-                    declarativeExpression->setSourceLocation(oldExpression->sourceFile(), oldExpression->lineNumber());
+                    QDeclarativePropertyPrivate::setSignalExpression(property, declarativeExpression);
+                    declarativeExpression->setSourceLocation(filename, line);
                 } else if (property.isProperty()) {
                     QDeclarativeBinding *binding = new QDeclarativeBinding(expression.toString(), object, context);
                     binding->setTarget(property);
+                    binding->setSourceLocation(filename, line);
                     binding->setNotifyOnValueChanged(true);
                     QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::setBinding(property, binding);
                     if (oldBinding)
@@ -644,7 +653,10 @@ void QDeclarativeEngineDebugServer::resetBinding(int objectId, const QString &pr
                     }
                 }
             }
-        } else {
+        } else if (hasValidSignal(object, propertyName)) {
+            QDeclarativeProperty property(object, propertyName, context);
+            QDeclarativePropertyPrivate::setSignalExpression(property, 0);
+    } else {
             if (QDeclarativePropertyChanges *propertyChanges = qobject_cast<QDeclarativePropertyChanges *>(object)) {
                 propertyChanges->removeProperty(propertyName);
             }
diff --git a/src/declarative/qml/qdeclarativeenginedebug_p.h b/src/declarative/qml/qdeclarativeenginedebug_p.h
index e95676c..64b2724 100644
--- a/src/declarative/qml/qdeclarativeenginedebug_p.h
+++ b/src/declarative/qml/qdeclarativeenginedebug_p.h
@@ -115,7 +115,7 @@ private:
     QDeclarativeObjectData objectData(QObject *);
     QDeclarativeObjectProperty propertyData(QObject *, int);
     QVariant valueContents(const QVariant &defaultValue) const;
-    void setBinding(int objectId, const QString &propertyName, const QVariant &expression, bool isLiteralValue);
+    void setBinding(int objectId, const QString &propertyName, const QVariant &expression, bool isLiteralValue, QString filename = QString(), int line = -1);
     void resetBinding(int objectId, const QString &propertyName);
     void setMethodBody(int objectId, const QString &method, const QString &body);
 
diff --git a/src/declarative/util/qdeclarativeview.cpp b/src/declarative/util/qdeclarativeview.cpp
index e24f80f..628c82c 100644
--- a/src/declarative/util/qdeclarativeview.cpp
+++ b/src/declarative/util/qdeclarativeview.cpp
@@ -49,6 +49,7 @@
 #include <qdeclarativeguard_p.h>
 
 #include <private/qdeclarativedebugtrace_p.h>
+#include <private/qdeclarativeobserverservice_p.h>
 
 #include <qscriptvalueiterator.h>
 #include <qdebug.h>
@@ -299,6 +300,8 @@ void QDeclarativeViewPrivate::init()
     q->viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
     q->viewport()->setAttribute(Qt::WA_NoSystemBackground);
 #endif
+
+    QDeclarativeObserverService::instance()->addView(q);
 }
 
 /*!
@@ -306,6 +309,7 @@ void QDeclarativeViewPrivate::init()
  */
 QDeclarativeView::~QDeclarativeView()
 {
+    QDeclarativeObserverService::instance()->removeView(this);
 }
 
 /*! \property QDeclarativeView::source
@@ -558,7 +562,6 @@ void QDeclarativeView::continueExecute()
     emit statusChanged(status());
 }
 
-
 /*!
   \internal
 */