Initial import from the monolithic Qt.

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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

19 files changed, 3998 insertions, 0 deletions

diff --git a/src/declarative/debugger/debugger.pri b/src/declarative/debugger/debugger.pri
new file mode 100644
index 0000000000..75287b4563
--- /dev/null
+++ b/src/declarative/debugger/debugger.pri
@@ -0,0 +1,23 @@
+INCLUDEPATH += $$PWD
+
+SOURCES += \
+    $$PWD/qdeclarativedebuggerstatus.cpp \
+    $$PWD/qpacketprotocol.cpp \
+    $$PWD/qdeclarativedebugservice.cpp \
+    $$PWD/qdeclarativedebugclient.cpp \
+    $$PWD/qdeclarativedebug.cpp \
+    $$PWD/qdeclarativedebugtrace.cpp \
+    $$PWD/qdeclarativedebughelper.cpp \
+    $$PWD/qdeclarativedebugserver.cpp
+
+HEADERS += \
+    $$PWD/qdeclarativedebuggerstatus_p.h \
+    $$PWD/qpacketprotocol_p.h \
+    $$PWD/qdeclarativedebugservice_p.h \
+    $$PWD/qdeclarativedebugservice_p_p.h \
+    $$PWD/qdeclarativedebugclient_p.h \
+    $$PWD/qdeclarativedebug_p.h \
+    $$PWD/qdeclarativedebugtrace_p.h \
+    $$PWD/qdeclarativedebughelper_p.h \
+    $$PWD/qdeclarativedebugserver_p.h \
+    debugger/qdeclarativedebugserverconnection_p.h
diff --git a/src/declarative/debugger/qdeclarativedebug.cpp b/src/declarative/debugger/qdeclarativedebug.cpp
new file mode 100644
index 0000000000..62eb8fea3e
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebug.cpp
@@ -0,0 +1,1021 @@
+/****************************************************************************
+**
+** 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/qdeclarativedebug_p.h"
+
+#include "private/qdeclarativedebugclient_p.h"
+
+#include <qdeclarativeenginedebug_p.h>
+
+#include <private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QDeclarativeEngineDebugClient : public QDeclarativeDebugClient
+{
+public:
+    QDeclarativeEngineDebugClient(QDeclarativeDebugConnection *client, QDeclarativeEngineDebugPrivate *p);
+
+protected:
+    virtual void statusChanged(Status status);
+    virtual void messageReceived(const QByteArray &);
+
+private:
+    QDeclarativeEngineDebugPrivate *priv;
+    friend class QDeclarativeEngineDebugPrivate;
+};
+
+class QDeclarativeEngineDebugPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QDeclarativeEngineDebug)
+public:
+    QDeclarativeEngineDebugPrivate(QDeclarativeDebugConnection *);
+    ~QDeclarativeEngineDebugPrivate();
+
+    void statusChanged(QDeclarativeEngineDebug::Status status);
+    void message(const QByteArray &);
+
+    QDeclarativeEngineDebugClient *client;
+    int nextId;
+    int getId();
+
+    void decode(QDataStream &, QDeclarativeDebugContextReference &);
+    void decode(QDataStream &, QDeclarativeDebugObjectReference &, bool simple);
+
+    static void remove(QDeclarativeEngineDebug *, QDeclarativeDebugEnginesQuery *);
+    static void remove(QDeclarativeEngineDebug *, QDeclarativeDebugRootContextQuery *);
+    static void remove(QDeclarativeEngineDebug *, QDeclarativeDebugObjectQuery *);
+    static void remove(QDeclarativeEngineDebug *, QDeclarativeDebugExpressionQuery *);
+
+    QHash<int, QDeclarativeDebugEnginesQuery *> enginesQuery;
+    QHash<int, QDeclarativeDebugRootContextQuery *> rootContextQuery;
+    QHash<int, QDeclarativeDebugObjectQuery *> objectQuery;
+    QHash<int, QDeclarativeDebugExpressionQuery *> expressionQuery;
+
+    QHash<int, QDeclarativeDebugWatch *> watched;
+};
+
+QDeclarativeEngineDebugClient::QDeclarativeEngineDebugClient(QDeclarativeDebugConnection *client,
+                                           QDeclarativeEngineDebugPrivate *p)
+: QDeclarativeDebugClient(QLatin1String("QDeclarativeEngine"), client), priv(p)
+{
+}
+
+void QDeclarativeEngineDebugClient::statusChanged(Status status)
+{
+    if (priv)
+        priv->statusChanged(static_cast<QDeclarativeEngineDebug::Status>(status));
+}
+
+void QDeclarativeEngineDebugClient::messageReceived(const QByteArray &data)
+{
+    if (priv)
+        priv->message(data);
+}
+
+QDeclarativeEngineDebugPrivate::QDeclarativeEngineDebugPrivate(QDeclarativeDebugConnection *c)
+: client(new QDeclarativeEngineDebugClient(c, this)), nextId(0)
+{
+}
+
+QDeclarativeEngineDebugPrivate::~QDeclarativeEngineDebugPrivate()
+{
+    if (client)
+        client->priv = 0;
+}
+
+int QDeclarativeEngineDebugPrivate::getId()
+{
+    return nextId++;
+}
+
+void QDeclarativeEngineDebugPrivate::remove(QDeclarativeEngineDebug *c, QDeclarativeDebugEnginesQuery *q)
+{
+    if (c && q) {
+        QDeclarativeEngineDebugPrivate *p = (QDeclarativeEngineDebugPrivate *)QObjectPrivate::get(c);
+        p->enginesQuery.remove(q->m_queryId);
+    }
+}
+
+void QDeclarativeEngineDebugPrivate::remove(QDeclarativeEngineDebug *c, 
+                                   QDeclarativeDebugRootContextQuery *q)
+{
+    if (c && q) {
+        QDeclarativeEngineDebugPrivate *p = (QDeclarativeEngineDebugPrivate *)QObjectPrivate::get(c);
+        p->rootContextQuery.remove(q->m_queryId);
+    }
+}
+
+void QDeclarativeEngineDebugPrivate::remove(QDeclarativeEngineDebug *c, QDeclarativeDebugObjectQuery *q)
+{
+    if (c && q) {
+        QDeclarativeEngineDebugPrivate *p = (QDeclarativeEngineDebugPrivate *)QObjectPrivate::get(c);
+        p->objectQuery.remove(q->m_queryId);
+    }
+}
+
+void QDeclarativeEngineDebugPrivate::remove(QDeclarativeEngineDebug *c, QDeclarativeDebugExpressionQuery *q)
+{
+    if (c && q) {
+        QDeclarativeEngineDebugPrivate *p = (QDeclarativeEngineDebugPrivate *)QObjectPrivate::get(c);
+        p->expressionQuery.remove(q->m_queryId);
+    }
+}
+
+void QDeclarativeEngineDebugPrivate::decode(QDataStream &ds, QDeclarativeDebugObjectReference &o,
+                                   bool simple)
+{
+    QDeclarativeEngineDebugServer::QDeclarativeObjectData data;
+    ds >> data;
+    o.m_debugId = data.objectId;
+    o.m_class = data.objectType;
+    o.m_idString = data.idString;
+    o.m_name = data.objectName;
+    o.m_source.m_url = data.url;
+    o.m_source.m_lineNumber = data.lineNumber;
+    o.m_source.m_columnNumber = data.columnNumber;
+    o.m_contextDebugId = data.contextId;
+
+    if (simple)
+        return;
+
+    int childCount;
+    bool recur;
+    ds >> childCount >> recur;
+
+    for (int ii = 0; ii < childCount; ++ii) {
+        o.m_children.append(QDeclarativeDebugObjectReference());
+        decode(ds, o.m_children.last(), !recur);
+    }
+
+    int propCount;
+    ds >> propCount;
+
+    for (int ii = 0; ii < propCount; ++ii) {
+        QDeclarativeEngineDebugServer::QDeclarativeObjectProperty data;
+        ds >> data;
+        QDeclarativeDebugPropertyReference prop;
+        prop.m_objectDebugId = o.m_debugId;
+        prop.m_name = data.name;
+        prop.m_binding = data.binding;
+        prop.m_hasNotifySignal = data.hasNotifySignal;
+        prop.m_valueTypeName = data.valueTypeName;
+        switch (data.type) {
+            case QDeclarativeEngineDebugServer::QDeclarativeObjectProperty::Basic:
+            case QDeclarativeEngineDebugServer::QDeclarativeObjectProperty::List:
+            case QDeclarativeEngineDebugServer::QDeclarativeObjectProperty::SignalProperty:
+            {
+                prop.m_value = data.value;
+                break;
+            }
+            case QDeclarativeEngineDebugServer::QDeclarativeObjectProperty::Object:
+            {
+                QDeclarativeDebugObjectReference obj;
+                obj.m_debugId = prop.m_value.toInt();
+                prop.m_value = QVariant::fromValue(obj);
+                break;
+            }
+            case QDeclarativeEngineDebugServer::QDeclarativeObjectProperty::Unknown:
+                break;
+        }
+        o.m_properties << prop;
+    }
+}
+
+void QDeclarativeEngineDebugPrivate::decode(QDataStream &ds, QDeclarativeDebugContextReference &c)
+{
+    ds >> c.m_name >> c.m_debugId;
+
+    int contextCount;
+    ds >> contextCount;
+
+    for (int ii = 0; ii < contextCount; ++ii) {
+        c.m_contexts.append(QDeclarativeDebugContextReference());
+        decode(ds, c.m_contexts.last());
+    }
+
+    int objectCount;
+    ds >> objectCount;
+
+    for (int ii = 0; ii < objectCount; ++ii) {
+        QDeclarativeDebugObjectReference obj;
+        decode(ds, obj, true);
+
+        obj.m_contextDebugId = c.m_debugId;
+        c.m_objects << obj;
+    }
+}
+
+void QDeclarativeEngineDebugPrivate::statusChanged(QDeclarativeEngineDebug::Status status)
+{
+    emit q_func()->statusChanged(status);
+}
+
+void QDeclarativeEngineDebugPrivate::message(const QByteArray &data)
+{
+    QDataStream ds(data);
+
+    QByteArray type;
+    ds >> type;
+
+    //qDebug() << "QDeclarativeEngineDebugPrivate::message()" << type;
+
+    if (type == "LIST_ENGINES_R") {
+        int queryId;
+        ds >> queryId;
+
+        QDeclarativeDebugEnginesQuery *query = enginesQuery.value(queryId);
+        if (!query)
+            return;
+        enginesQuery.remove(queryId);
+
+        int count;
+        ds >> count;
+
+        for (int ii = 0; ii < count; ++ii) {
+            QDeclarativeDebugEngineReference ref;
+            ds >> ref.m_name;
+            ds >> ref.m_debugId;
+            query->m_engines << ref;
+        }
+
+        query->m_client = 0;
+        query->setState(QDeclarativeDebugQuery::Completed);
+    } else if (type == "LIST_OBJECTS_R") {
+        int queryId;
+        ds >> queryId;
+
+        QDeclarativeDebugRootContextQuery *query = rootContextQuery.value(queryId);
+        if (!query)
+            return;
+        rootContextQuery.remove(queryId);
+
+        if (!ds.atEnd()) 
+            decode(ds, query->m_context);
+
+        query->m_client = 0;
+        query->setState(QDeclarativeDebugQuery::Completed);
+    } else if (type == "FETCH_OBJECT_R") {
+        int queryId;
+        ds >> queryId;
+
+        QDeclarativeDebugObjectQuery *query = objectQuery.value(queryId);
+        if (!query)
+            return;
+        objectQuery.remove(queryId);
+
+        if (!ds.atEnd())
+            decode(ds, query->m_object, false);
+
+        query->m_client = 0;
+        query->setState(QDeclarativeDebugQuery::Completed);
+    } else if (type == "EVAL_EXPRESSION_R") {
+        int queryId;
+        QVariant result;
+        ds >> queryId >> result;
+
+        QDeclarativeDebugExpressionQuery *query = expressionQuery.value(queryId);
+        if (!query)
+            return;
+        expressionQuery.remove(queryId);
+
+        query->m_result = result;
+        query->m_client = 0;
+        query->setState(QDeclarativeDebugQuery::Completed);
+    } else if (type == "WATCH_PROPERTY_R") {
+        int queryId;
+        bool ok;
+        ds >> queryId >> ok;
+
+        QDeclarativeDebugWatch *watch = watched.value(queryId);
+        if (!watch)
+            return;
+
+        watch->setState(ok ? QDeclarativeDebugWatch::Active : QDeclarativeDebugWatch::Inactive);
+    } else if (type == "WATCH_OBJECT_R") {
+        int queryId;
+        bool ok;
+        ds >> queryId >> ok;
+
+        QDeclarativeDebugWatch *watch = watched.value(queryId);
+        if (!watch)
+            return;
+
+        watch->setState(ok ? QDeclarativeDebugWatch::Active : QDeclarativeDebugWatch::Inactive);
+    } else if (type == "WATCH_EXPR_OBJECT_R") {
+        int queryId;
+        bool ok;
+        ds >> queryId >> ok;
+
+        QDeclarativeDebugWatch *watch = watched.value(queryId);
+        if (!watch)
+            return;
+
+        watch->setState(ok ? QDeclarativeDebugWatch::Active : QDeclarativeDebugWatch::Inactive);
+    } else if (type == "UPDATE_WATCH") {
+        int queryId;
+        int debugId;
+        QByteArray name;
+        QVariant value;
+        ds >> queryId >> debugId >> name >> value;
+
+        QDeclarativeDebugWatch *watch = watched.value(queryId, 0);
+        if (!watch)
+            return;
+        emit watch->valueChanged(name, value);
+    } else if (type == "OBJECT_CREATED") {
+        emit q_func()->newObjects();
+    }
+}
+
+QDeclarativeEngineDebug::QDeclarativeEngineDebug(QDeclarativeDebugConnection *client, QObject *parent)
+: QObject(*(new QDeclarativeEngineDebugPrivate(client)), parent)
+{
+}
+
+QDeclarativeEngineDebug::Status QDeclarativeEngineDebug::status() const
+{
+    Q_D(const QDeclarativeEngineDebug);
+
+    return static_cast<QDeclarativeEngineDebug::Status>(d->client->status());
+}
+
+QDeclarativeDebugPropertyWatch *QDeclarativeEngineDebug::addWatch(const QDeclarativeDebugPropertyReference &property, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugPropertyWatch *watch = new QDeclarativeDebugPropertyWatch(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled) {
+        int queryId = d->getId();
+        watch->m_queryId = queryId;
+        watch->m_client = this;
+        watch->m_objectDebugId = property.objectDebugId();
+        watch->m_name = property.name();
+        d->watched.insert(queryId, watch);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("WATCH_PROPERTY") << queryId << property.objectDebugId() << property.name().toUtf8();
+        d->client->sendMessage(message);
+    } else {
+        watch->m_state = QDeclarativeDebugWatch::Dead;
+    }
+
+    return watch;
+}
+
+QDeclarativeDebugWatch *QDeclarativeEngineDebug::addWatch(const QDeclarativeDebugContextReference &, const QString &, QObject *)
+{
+    qWarning("QDeclarativeEngineDebug::addWatch(): Not implemented");
+    return 0;
+}
+
+QDeclarativeDebugObjectExpressionWatch *QDeclarativeEngineDebug::addWatch(const QDeclarativeDebugObjectReference &object, const QString &expr, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+    QDeclarativeDebugObjectExpressionWatch *watch = new QDeclarativeDebugObjectExpressionWatch(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled) {
+        int queryId = d->getId();
+        watch->m_queryId = queryId;
+        watch->m_client = this;
+        watch->m_objectDebugId = object.debugId();
+        watch->m_expr = expr;
+        d->watched.insert(queryId, watch);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("WATCH_EXPR_OBJECT") << queryId << object.debugId() << expr;
+        d->client->sendMessage(message);
+    } else {
+        watch->m_state = QDeclarativeDebugWatch::Dead;
+    }
+    return watch;
+}
+
+QDeclarativeDebugWatch *QDeclarativeEngineDebug::addWatch(const QDeclarativeDebugObjectReference &object, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugWatch *watch = new QDeclarativeDebugWatch(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled) {
+        int queryId = d->getId();
+        watch->m_queryId = queryId;
+        watch->m_client = this;
+        watch->m_objectDebugId = object.debugId();
+        d->watched.insert(queryId, watch);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("WATCH_OBJECT") << queryId << object.debugId();
+        d->client->sendMessage(message);
+    } else {
+        watch->m_state = QDeclarativeDebugWatch::Dead;
+    }
+
+    return watch;
+}
+
+QDeclarativeDebugWatch *QDeclarativeEngineDebug::addWatch(const QDeclarativeDebugFileReference &, QObject *)
+{
+    qWarning("QDeclarativeEngineDebug::addWatch(): Not implemented");
+    return 0;
+}
+
+void QDeclarativeEngineDebug::removeWatch(QDeclarativeDebugWatch *watch)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    if (!watch || !watch->m_client)
+        return;
+
+    watch->m_client = 0;
+    watch->setState(QDeclarativeDebugWatch::Inactive);
+    
+    d->watched.remove(watch->queryId());
+
+    if (d->client && d->client->status() == QDeclarativeDebugClient::Enabled) {
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("NO_WATCH") << watch->queryId();
+        d->client->sendMessage(message);
+    }
+}
+
+QDeclarativeDebugEnginesQuery *QDeclarativeEngineDebug::queryAvailableEngines(QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugEnginesQuery *query = new QDeclarativeDebugEnginesQuery(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled) {
+        query->m_client = this;
+        int queryId = d->getId();
+        query->m_queryId = queryId;
+        d->enginesQuery.insert(queryId, query);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("LIST_ENGINES") << queryId;
+        d->client->sendMessage(message);
+    } else {
+        query->m_state = QDeclarativeDebugQuery::Error;
+    }
+
+    return query;
+}
+
+QDeclarativeDebugRootContextQuery *QDeclarativeEngineDebug::queryRootContexts(const QDeclarativeDebugEngineReference &engine, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugRootContextQuery *query = new QDeclarativeDebugRootContextQuery(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && engine.debugId() != -1) {
+        query->m_client = this;
+        int queryId = d->getId();
+        query->m_queryId = queryId;
+        d->rootContextQuery.insert(queryId, query);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("LIST_OBJECTS") << queryId << engine.debugId();
+        d->client->sendMessage(message);
+    } else {
+        query->m_state = QDeclarativeDebugQuery::Error;
+    }
+
+    return query;
+}
+
+QDeclarativeDebugObjectQuery *QDeclarativeEngineDebug::queryObject(const QDeclarativeDebugObjectReference &object, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugObjectQuery *query = new QDeclarativeDebugObjectQuery(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && object.debugId() != -1) {
+        query->m_client = this;
+        int queryId = d->getId();
+        query->m_queryId = queryId;
+        d->objectQuery.insert(queryId, query);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("FETCH_OBJECT") << queryId << object.debugId() 
+           << false << true;
+        d->client->sendMessage(message);
+    } else {
+        query->m_state = QDeclarativeDebugQuery::Error;
+    }
+
+    return query;
+}
+
+QDeclarativeDebugObjectQuery *QDeclarativeEngineDebug::queryObjectRecursive(const QDeclarativeDebugObjectReference &object, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugObjectQuery *query = new QDeclarativeDebugObjectQuery(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && object.debugId() != -1) {
+        query->m_client = this;
+        int queryId = d->getId();
+        query->m_queryId = queryId;
+        d->objectQuery.insert(queryId, query);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("FETCH_OBJECT") << queryId << object.debugId() 
+           << true << true;
+        d->client->sendMessage(message);
+    } else {
+        query->m_state = QDeclarativeDebugQuery::Error;
+    }
+
+    return query;
+}
+
+QDeclarativeDebugExpressionQuery *QDeclarativeEngineDebug::queryExpressionResult(int objectDebugId, const QString &expr, QObject *parent)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    QDeclarativeDebugExpressionQuery *query = new QDeclarativeDebugExpressionQuery(parent);
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && objectDebugId != -1) {
+        query->m_client = this;
+        query->m_expr = expr;
+        int queryId = d->getId();
+        query->m_queryId = queryId;
+        d->expressionQuery.insert(queryId, query);
+
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("EVAL_EXPRESSION") << queryId << objectDebugId << expr;
+        d->client->sendMessage(message);
+    } else {
+        query->m_state = QDeclarativeDebugQuery::Error;
+    }
+
+    return query;
+}
+
+bool QDeclarativeEngineDebug::setBindingForObject(int objectDebugId, const QString &propertyName,
+                                                  const QVariant &bindingExpression,
+                                                  bool isLiteralValue)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && objectDebugId != -1) {
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("SET_BINDING") << objectDebugId << propertyName << bindingExpression << isLiteralValue;
+        d->client->sendMessage(message);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool QDeclarativeEngineDebug::resetBindingForObject(int objectDebugId, const QString &propertyName)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && objectDebugId != -1) {
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("RESET_BINDING") << objectDebugId << propertyName;
+        d->client->sendMessage(message);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool QDeclarativeEngineDebug::setMethodBody(int objectDebugId, const QString &methodName,
+                                            const QString &methodBody)
+{
+    Q_D(QDeclarativeEngineDebug);
+
+    if (d->client->status() == QDeclarativeDebugClient::Enabled && objectDebugId != -1) {
+        QByteArray message;
+        QDataStream ds(&message, QIODevice::WriteOnly);
+        ds << QByteArray("SET_METHOD_BODY") << objectDebugId << methodName << methodBody;
+        d->client->sendMessage(message);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+QDeclarativeDebugWatch::QDeclarativeDebugWatch(QObject *parent)
+: QObject(parent), m_state(Waiting), m_queryId(-1), m_client(0), m_objectDebugId(-1)
+{
+}
+
+QDeclarativeDebugWatch::~QDeclarativeDebugWatch()
+{
+}
+
+int QDeclarativeDebugWatch::queryId() const
+{
+    return m_queryId;
+}
+
+int QDeclarativeDebugWatch::objectDebugId() const
+{
+    return m_objectDebugId;
+}
+
+QDeclarativeDebugWatch::State QDeclarativeDebugWatch::state() const
+{
+    return m_state;
+}
+
+void QDeclarativeDebugWatch::setState(State s)
+{
+    if (m_state == s)
+        return;
+    m_state = s;
+    emit stateChanged(m_state);
+}
+
+QDeclarativeDebugPropertyWatch::QDeclarativeDebugPropertyWatch(QObject *parent)
+    : QDeclarativeDebugWatch(parent)
+{
+}
+
+QString QDeclarativeDebugPropertyWatch::name() const
+{
+    return m_name;
+}
+
+
+QDeclarativeDebugObjectExpressionWatch::QDeclarativeDebugObjectExpressionWatch(QObject *parent)
+    : QDeclarativeDebugWatch(parent)
+{
+}
+
+QString QDeclarativeDebugObjectExpressionWatch::expression() const
+{
+    return m_expr;
+}
+
+
+QDeclarativeDebugQuery::QDeclarativeDebugQuery(QObject *parent)
+: QObject(parent), m_state(Waiting)
+{
+}
+
+QDeclarativeDebugQuery::State QDeclarativeDebugQuery::state() const
+{
+    return m_state;
+}
+
+bool QDeclarativeDebugQuery::isWaiting() const
+{
+    return m_state == Waiting;
+}
+
+void QDeclarativeDebugQuery::setState(State s)
+{
+    if (m_state == s)
+        return;
+    m_state = s;
+    emit stateChanged(m_state);
+}
+
+QDeclarativeDebugEnginesQuery::QDeclarativeDebugEnginesQuery(QObject *parent)
+: QDeclarativeDebugQuery(parent), m_client(0), m_queryId(-1)
+{
+}
+
+QDeclarativeDebugEnginesQuery::~QDeclarativeDebugEnginesQuery()
+{
+    if (m_client && m_queryId != -1) 
+        QDeclarativeEngineDebugPrivate::remove(m_client, this);
+}
+
+QList<QDeclarativeDebugEngineReference> QDeclarativeDebugEnginesQuery::engines() const
+{
+    return m_engines;
+}
+
+QDeclarativeDebugRootContextQuery::QDeclarativeDebugRootContextQuery(QObject *parent)
+: QDeclarativeDebugQuery(parent), m_client(0), m_queryId(-1)
+{
+}
+
+QDeclarativeDebugRootContextQuery::~QDeclarativeDebugRootContextQuery()
+{
+    if (m_client && m_queryId != -1) 
+        QDeclarativeEngineDebugPrivate::remove(m_client, this);
+}
+
+QDeclarativeDebugContextReference QDeclarativeDebugRootContextQuery::rootContext() const
+{
+    return m_context;
+}
+
+QDeclarativeDebugObjectQuery::QDeclarativeDebugObjectQuery(QObject *parent)
+: QDeclarativeDebugQuery(parent), m_client(0), m_queryId(-1)
+{
+}
+
+QDeclarativeDebugObjectQuery::~QDeclarativeDebugObjectQuery()
+{
+    if (m_client && m_queryId != -1) 
+        QDeclarativeEngineDebugPrivate::remove(m_client, this);
+}
+
+QDeclarativeDebugObjectReference QDeclarativeDebugObjectQuery::object() const
+{
+    return m_object;
+}
+
+QDeclarativeDebugExpressionQuery::QDeclarativeDebugExpressionQuery(QObject *parent)
+: QDeclarativeDebugQuery(parent), m_client(0), m_queryId(-1)
+{
+}
+
+QDeclarativeDebugExpressionQuery::~QDeclarativeDebugExpressionQuery()
+{
+    if (m_client && m_queryId != -1) 
+        QDeclarativeEngineDebugPrivate::remove(m_client, this);
+}
+
+QVariant QDeclarativeDebugExpressionQuery::expression() const
+{
+    return m_expr;
+}
+
+QVariant QDeclarativeDebugExpressionQuery::result() const
+{
+    return m_result;
+}
+
+QDeclarativeDebugEngineReference::QDeclarativeDebugEngineReference()
+: m_debugId(-1)
+{
+}
+
+QDeclarativeDebugEngineReference::QDeclarativeDebugEngineReference(int debugId)
+: m_debugId(debugId)
+{
+}
+
+QDeclarativeDebugEngineReference::QDeclarativeDebugEngineReference(const QDeclarativeDebugEngineReference &o)
+: m_debugId(o.m_debugId), m_name(o.m_name)
+{
+}
+
+QDeclarativeDebugEngineReference &
+QDeclarativeDebugEngineReference::operator=(const QDeclarativeDebugEngineReference &o)
+{
+    m_debugId = o.m_debugId; m_name = o.m_name;
+    return *this;
+}
+
+int QDeclarativeDebugEngineReference::debugId() const
+{
+    return m_debugId;
+}
+
+QString QDeclarativeDebugEngineReference::name() const
+{
+    return m_name;
+}
+
+QDeclarativeDebugObjectReference::QDeclarativeDebugObjectReference()
+: m_debugId(-1), m_contextDebugId(-1)
+{
+}
+
+QDeclarativeDebugObjectReference::QDeclarativeDebugObjectReference(int debugId)
+: m_debugId(debugId), m_contextDebugId(-1)
+{
+}
+
+QDeclarativeDebugObjectReference::QDeclarativeDebugObjectReference(const QDeclarativeDebugObjectReference &o)
+: m_debugId(o.m_debugId), m_class(o.m_class), m_idString(o.m_idString),
+  m_name(o.m_name), m_source(o.m_source), m_contextDebugId(o.m_contextDebugId),
+  m_properties(o.m_properties), m_children(o.m_children)
+{
+}
+
+QDeclarativeDebugObjectReference &
+QDeclarativeDebugObjectReference::operator=(const QDeclarativeDebugObjectReference &o)
+{
+    m_debugId = o.m_debugId; m_class = o.m_class; m_idString = o.m_idString;
+    m_name = o.m_name; m_source = o.m_source; m_contextDebugId = o.m_contextDebugId;
+    m_properties = o.m_properties; m_children = o.m_children;
+    return *this;
+}
+
+int QDeclarativeDebugObjectReference::debugId() const
+{
+    return m_debugId;
+}
+
+QString QDeclarativeDebugObjectReference::className() const
+{
+    return m_class;
+}
+
+QString QDeclarativeDebugObjectReference::idString() const
+{
+    return m_idString;
+}
+
+QString QDeclarativeDebugObjectReference::name() const
+{
+    return m_name;
+}
+
+QDeclarativeDebugFileReference QDeclarativeDebugObjectReference::source() const
+{
+    return m_source;
+}
+
+int QDeclarativeDebugObjectReference::contextDebugId() const
+{
+    return m_contextDebugId;
+}
+
+QList<QDeclarativeDebugPropertyReference> QDeclarativeDebugObjectReference::properties() const
+{
+    return m_properties;
+}
+
+QList<QDeclarativeDebugObjectReference> QDeclarativeDebugObjectReference::children() const
+{
+    return m_children;
+}
+
+QDeclarativeDebugContextReference::QDeclarativeDebugContextReference()
+: m_debugId(-1)
+{
+}
+
+QDeclarativeDebugContextReference::QDeclarativeDebugContextReference(const QDeclarativeDebugContextReference &o)
+: m_debugId(o.m_debugId), m_name(o.m_name), m_objects(o.m_objects), m_contexts(o.m_contexts)
+{
+}
+
+QDeclarativeDebugContextReference &QDeclarativeDebugContextReference::operator=(const QDeclarativeDebugContextReference &o)
+{
+    m_debugId = o.m_debugId; m_name = o.m_name; m_objects = o.m_objects; 
+    m_contexts = o.m_contexts;
+    return *this;
+}
+
+int QDeclarativeDebugContextReference::debugId() const
+{
+    return m_debugId;
+}
+
+QString QDeclarativeDebugContextReference::name() const
+{
+    return m_name;
+}
+
+QList<QDeclarativeDebugObjectReference> QDeclarativeDebugContextReference::objects() const
+{
+    return m_objects;
+}
+
+QList<QDeclarativeDebugContextReference> QDeclarativeDebugContextReference::contexts() const
+{
+    return m_contexts;
+}
+
+QDeclarativeDebugFileReference::QDeclarativeDebugFileReference()
+: m_lineNumber(-1), m_columnNumber(-1)
+{
+}
+
+QDeclarativeDebugFileReference::QDeclarativeDebugFileReference(const QDeclarativeDebugFileReference &o)
+: m_url(o.m_url), m_lineNumber(o.m_lineNumber), m_columnNumber(o.m_columnNumber)
+{
+}
+
+QDeclarativeDebugFileReference &QDeclarativeDebugFileReference::operator=(const QDeclarativeDebugFileReference &o)
+{
+    m_url = o.m_url; m_lineNumber = o.m_lineNumber; m_columnNumber = o.m_columnNumber;
+    return *this;
+}
+
+QUrl QDeclarativeDebugFileReference::url() const
+{
+    return m_url;
+}
+
+void QDeclarativeDebugFileReference::setUrl(const QUrl &u)
+{
+    m_url = u;
+}
+
+int QDeclarativeDebugFileReference::lineNumber() const
+{
+    return m_lineNumber;
+}
+
+void QDeclarativeDebugFileReference::setLineNumber(int l)
+{
+    m_lineNumber = l;
+}
+
+int QDeclarativeDebugFileReference::columnNumber() const
+{
+    return m_columnNumber;
+}
+
+void QDeclarativeDebugFileReference::setColumnNumber(int c)
+{
+    m_columnNumber = c;
+}
+
+QDeclarativeDebugPropertyReference::QDeclarativeDebugPropertyReference()
+: m_objectDebugId(-1), m_hasNotifySignal(false)
+{
+}
+
+QDeclarativeDebugPropertyReference::QDeclarativeDebugPropertyReference(const QDeclarativeDebugPropertyReference &o)
+: m_objectDebugId(o.m_objectDebugId), m_name(o.m_name), m_value(o.m_value),
+  m_valueTypeName(o.m_valueTypeName), m_binding(o.m_binding),
+  m_hasNotifySignal(o.m_hasNotifySignal)
+{
+}
+
+QDeclarativeDebugPropertyReference &QDeclarativeDebugPropertyReference::operator=(const QDeclarativeDebugPropertyReference &o)
+{
+    m_objectDebugId = o.m_objectDebugId; m_name = o.m_name; m_value = o.m_value;
+    m_valueTypeName = o.m_valueTypeName; m_binding = o.m_binding;
+    m_hasNotifySignal = o.m_hasNotifySignal;
+    return *this;
+}
+
+int QDeclarativeDebugPropertyReference::objectDebugId() const
+{
+    return m_objectDebugId;
+}
+
+QString QDeclarativeDebugPropertyReference::name() const
+{
+    return m_name;
+}
+
+QString QDeclarativeDebugPropertyReference::valueTypeName() const
+{
+    return m_valueTypeName;
+}
+
+QVariant QDeclarativeDebugPropertyReference::value() const
+{
+    return m_value;
+}
+
+QString QDeclarativeDebugPropertyReference::binding() const
+{
+    return m_binding;
+}
+
+bool QDeclarativeDebugPropertyReference::hasNotifySignal() const
+{
+    return m_hasNotifySignal;
+}
+
+QT_END_NAMESPACE
+
diff --git a/src/declarative/debugger/qdeclarativedebug_p.h b/src/declarative/debugger/qdeclarativedebug_p.h
new file mode 100644
index 0000000000..58c8234555
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebug_p.h
@@ -0,0 +1,386 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUG_H
+#define QDECLARATIVEDEBUG_H
+
+#include <QtCore/qobject.h>
+#include <QtCore/qurl.h>
+#include <QtCore/qvariant.h>
+
+#include <private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeDebugConnection;
+class QDeclarativeDebugWatch;
+class QDeclarativeDebugPropertyWatch;
+class QDeclarativeDebugObjectExpressionWatch;
+class QDeclarativeDebugEnginesQuery;
+class QDeclarativeDebugRootContextQuery;
+class QDeclarativeDebugObjectQuery;
+class QDeclarativeDebugExpressionQuery;
+class QDeclarativeDebugPropertyReference;
+class QDeclarativeDebugContextReference;
+class QDeclarativeDebugObjectReference;
+class QDeclarativeDebugFileReference;
+class QDeclarativeDebugEngineReference;
+class QDeclarativeEngineDebugPrivate;
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeEngineDebug : public QObject
+{
+Q_OBJECT
+public:
+    enum Status { NotConnected, Unavailable, Enabled };
+
+    explicit QDeclarativeEngineDebug(QDeclarativeDebugConnection *, QObject * = 0);
+
+    Status status() const;
+
+    QDeclarativeDebugPropertyWatch *addWatch(const QDeclarativeDebugPropertyReference &,
+                            QObject *parent = 0);
+    QDeclarativeDebugWatch *addWatch(const QDeclarativeDebugContextReference &, const QString &,
+                            QObject *parent = 0);
+    QDeclarativeDebugObjectExpressionWatch *addWatch(const QDeclarativeDebugObjectReference &, const QString &,
+                            QObject *parent = 0);
+    QDeclarativeDebugWatch *addWatch(const QDeclarativeDebugObjectReference &,
+                            QObject *parent = 0);
+    QDeclarativeDebugWatch *addWatch(const QDeclarativeDebugFileReference &,
+                            QObject *parent = 0);
+
+    void removeWatch(QDeclarativeDebugWatch *watch);
+
+    QDeclarativeDebugEnginesQuery *queryAvailableEngines(QObject *parent = 0);
+    QDeclarativeDebugRootContextQuery *queryRootContexts(const QDeclarativeDebugEngineReference &,
+                                                QObject *parent = 0);
+    QDeclarativeDebugObjectQuery *queryObject(const QDeclarativeDebugObjectReference &, 
+                                     QObject *parent = 0);
+    QDeclarativeDebugObjectQuery *queryObjectRecursive(const QDeclarativeDebugObjectReference &, 
+                                              QObject *parent = 0);
+    QDeclarativeDebugExpressionQuery *queryExpressionResult(int objectDebugId, 
+                                                   const QString &expr,
+                                                   QObject *parent = 0);
+    bool setBindingForObject(int objectDebugId, const QString &propertyName,
+                             const QVariant &bindingExpression, bool isLiteralValue);
+    bool resetBindingForObject(int objectDebugId, const QString &propertyName);
+    bool setMethodBody(int objectDebugId, const QString &methodName, const QString &methodBody);
+
+Q_SIGNALS:
+    void newObjects();
+    void statusChanged(Status status);
+
+private:
+    Q_DECLARE_PRIVATE(QDeclarativeEngineDebug)
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugWatch : public QObject
+{
+Q_OBJECT
+public:
+    enum State { Waiting, Active, Inactive, Dead };
+
+    QDeclarativeDebugWatch(QObject *);
+    ~QDeclarativeDebugWatch();
+
+    int queryId() const;
+    int objectDebugId() const;
+    State state() const;
+
+Q_SIGNALS:
+    void stateChanged(QDeclarativeDebugWatch::State);
+    //void objectChanged(int, const QDeclarativeDebugObjectReference &);
+    //void valueChanged(int, const QVariant &);
+
+    // Server sends value as string if it is a user-type variant
+    void valueChanged(const QByteArray &name, const QVariant &value);
+
+private:
+    friend class QDeclarativeEngineDebug;
+    friend class QDeclarativeEngineDebugPrivate;
+    void setState(State);
+    State m_state;
+    int m_queryId;
+    QDeclarativeEngineDebug *m_client;
+    int m_objectDebugId;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugPropertyWatch : public QDeclarativeDebugWatch
+{
+    Q_OBJECT
+public:
+    QDeclarativeDebugPropertyWatch(QObject *parent);
+
+    QString name() const;
+
+private:
+    friend class QDeclarativeEngineDebug;
+    QString m_name;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugObjectExpressionWatch : public QDeclarativeDebugWatch
+{
+    Q_OBJECT
+public:
+    QDeclarativeDebugObjectExpressionWatch(QObject *parent);
+
+    QString expression() const;
+
+private:
+    friend class QDeclarativeEngineDebug;
+    QString m_expr;
+    int m_debugId;
+};
+
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugQuery : public QObject
+{
+Q_OBJECT
+public:
+    enum State { Waiting, Error, Completed };
+
+    State state() const;
+    bool isWaiting() const;
+
+//    bool waitUntilCompleted();
+
+Q_SIGNALS:
+    void stateChanged(QDeclarativeDebugQuery::State);
+
+protected:
+    QDeclarativeDebugQuery(QObject *);
+
+private:
+    friend class QDeclarativeEngineDebug;
+    friend class QDeclarativeEngineDebugPrivate;
+    void setState(State);
+    State m_state;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugFileReference 
+{
+public:
+    QDeclarativeDebugFileReference();
+    QDeclarativeDebugFileReference(const QDeclarativeDebugFileReference &);
+    QDeclarativeDebugFileReference &operator=(const QDeclarativeDebugFileReference &);
+
+    QUrl url() const;
+    void setUrl(const QUrl &);
+    int lineNumber() const;
+    void setLineNumber(int);
+    int columnNumber() const;
+    void setColumnNumber(int);
+
+private:
+    friend class QDeclarativeEngineDebugPrivate;
+    QUrl m_url;
+    int m_lineNumber;
+    int m_columnNumber;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugEngineReference
+{
+public:
+    QDeclarativeDebugEngineReference();
+    QDeclarativeDebugEngineReference(int);
+    QDeclarativeDebugEngineReference(const QDeclarativeDebugEngineReference &);
+    QDeclarativeDebugEngineReference &operator=(const QDeclarativeDebugEngineReference &);
+
+    int debugId() const;
+    QString name() const;
+
+private:
+    friend class QDeclarativeEngineDebugPrivate;
+    int m_debugId;
+    QString m_name;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugObjectReference
+{
+public:
+    QDeclarativeDebugObjectReference();
+    QDeclarativeDebugObjectReference(int);
+    QDeclarativeDebugObjectReference(const QDeclarativeDebugObjectReference &);
+    QDeclarativeDebugObjectReference &operator=(const QDeclarativeDebugObjectReference &);
+
+    int debugId() const;
+    QString className() const;
+    QString idString() const;
+    QString name() const;
+
+    QDeclarativeDebugFileReference source() const;
+    int contextDebugId() const;
+
+    QList<QDeclarativeDebugPropertyReference> properties() const;
+    QList<QDeclarativeDebugObjectReference> children() const;
+
+private:
+    friend class QDeclarativeEngineDebugPrivate;
+    int m_debugId;
+    QString m_class;
+    QString m_idString;
+    QString m_name;
+    QDeclarativeDebugFileReference m_source;
+    int m_contextDebugId;
+    QList<QDeclarativeDebugPropertyReference> m_properties;
+    QList<QDeclarativeDebugObjectReference> m_children;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugContextReference
+{
+public:
+    QDeclarativeDebugContextReference();
+    QDeclarativeDebugContextReference(const QDeclarativeDebugContextReference &);
+    QDeclarativeDebugContextReference &operator=(const QDeclarativeDebugContextReference &);
+
+    int debugId() const;
+    QString name() const;
+
+    QList<QDeclarativeDebugObjectReference> objects() const;
+    QList<QDeclarativeDebugContextReference> contexts() const;
+
+private:
+    friend class QDeclarativeEngineDebugPrivate;
+    int m_debugId;
+    QString m_name;
+    QList<QDeclarativeDebugObjectReference> m_objects;
+    QList<QDeclarativeDebugContextReference> m_contexts;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugPropertyReference
+{
+public:
+    QDeclarativeDebugPropertyReference();
+    QDeclarativeDebugPropertyReference(const QDeclarativeDebugPropertyReference &);
+    QDeclarativeDebugPropertyReference &operator=(const QDeclarativeDebugPropertyReference &);
+
+    int objectDebugId() const;
+    QString name() const;
+    QVariant value() const;
+    QString valueTypeName() const;
+    QString binding() const;
+    bool hasNotifySignal() const;
+
+private:
+    friend class QDeclarativeEngineDebugPrivate;
+    int m_objectDebugId;
+    QString m_name;
+    QVariant m_value;
+    QString m_valueTypeName;
+    QString m_binding;
+    bool m_hasNotifySignal;
+};
+
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugEnginesQuery : public QDeclarativeDebugQuery
+{
+Q_OBJECT
+public:
+    virtual ~QDeclarativeDebugEnginesQuery();
+    QList<QDeclarativeDebugEngineReference> engines() const;
+private:
+    friend class QDeclarativeEngineDebug;
+    friend class QDeclarativeEngineDebugPrivate;
+    QDeclarativeDebugEnginesQuery(QObject *);
+    QDeclarativeEngineDebug *m_client;
+    int m_queryId;
+    QList<QDeclarativeDebugEngineReference> m_engines;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugRootContextQuery : public QDeclarativeDebugQuery
+{
+Q_OBJECT
+public:
+    virtual ~QDeclarativeDebugRootContextQuery();
+    QDeclarativeDebugContextReference rootContext() const;
+private:
+    friend class QDeclarativeEngineDebug;
+    friend class QDeclarativeEngineDebugPrivate;
+    QDeclarativeDebugRootContextQuery(QObject *);
+    QDeclarativeEngineDebug *m_client;
+    int m_queryId;
+    QDeclarativeDebugContextReference m_context;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugObjectQuery : public QDeclarativeDebugQuery
+{
+Q_OBJECT
+public:
+    virtual ~QDeclarativeDebugObjectQuery();
+    QDeclarativeDebugObjectReference object() const;
+private:
+    friend class QDeclarativeEngineDebug;
+    friend class QDeclarativeEngineDebugPrivate;
+    QDeclarativeDebugObjectQuery(QObject *);
+    QDeclarativeEngineDebug *m_client;
+    int m_queryId;
+    QDeclarativeDebugObjectReference m_object;
+
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugExpressionQuery : public QDeclarativeDebugQuery
+{
+Q_OBJECT
+public:
+    virtual ~QDeclarativeDebugExpressionQuery();
+    QVariant expression() const;
+    QVariant result() const;
+private:
+    friend class QDeclarativeEngineDebug;
+    friend class QDeclarativeEngineDebugPrivate;
+    QDeclarativeDebugExpressionQuery(QObject *);
+    QDeclarativeEngineDebug *m_client;
+    int m_queryId;
+    QVariant m_expr;
+    QVariant m_result;
+};
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QDeclarativeDebugEngineReference)
+Q_DECLARE_METATYPE(QDeclarativeDebugObjectReference)
+Q_DECLARE_METATYPE(QDeclarativeDebugContextReference)
+Q_DECLARE_METATYPE(QDeclarativeDebugPropertyReference)
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUG_H
diff --git a/src/declarative/debugger/qdeclarativedebugclient.cpp b/src/declarative/debugger/qdeclarativedebugclient.cpp
new file mode 100644
index 0000000000..036dee1f2c
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugclient.cpp
@@ -0,0 +1,292 @@
+/****************************************************************************
+**
+** 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/qdeclarativedebugclient_p.h"
+
+#include "private/qpacketprotocol_p.h"
+
+#include <QtCore/qdebug.h>
+#include <QtCore/qstringlist.h>
+
+#include <private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+const int protocolVersion = 1;
+const QString serverId = QLatin1String("QDeclarativeDebugServer");
+const QString clientId = QLatin1String("QDeclarativeDebugClient");
+
+class QDeclarativeDebugClientPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QDeclarativeDebugClient)
+public:
+    QDeclarativeDebugClientPrivate();
+
+    QString name;
+    QDeclarativeDebugConnection *connection;
+};
+
+class QDeclarativeDebugConnectionPrivate : public QObject
+{
+    Q_OBJECT
+public:
+    QDeclarativeDebugConnectionPrivate(QDeclarativeDebugConnection *c);
+    QDeclarativeDebugConnection *q;
+    QPacketProtocol *protocol;
+
+    bool gotHello;
+    QStringList serverPlugins;
+    QHash<QString, QDeclarativeDebugClient *> plugins;
+
+    void advertisePlugins();
+
+public Q_SLOTS:
+    void connected();
+    void readyRead();
+};
+
+QDeclarativeDebugConnectionPrivate::QDeclarativeDebugConnectionPrivate(QDeclarativeDebugConnection *c)
+: QObject(c), q(c), protocol(0), gotHello(false)
+{
+    protocol = new QPacketProtocol(q, this);
+    QObject::connect(c, SIGNAL(connected()), this, SLOT(connected()));
+    QObject::connect(protocol, SIGNAL(readyRead()), this, SLOT(readyRead()));
+}
+
+void QDeclarativeDebugConnectionPrivate::advertisePlugins()
+{
+    if (!q->isConnected())
+        return;
+
+    QPacket pack;
+    pack << serverId << 1 << plugins.keys();
+    protocol->send(pack);
+    q->flush();
+}
+
+void QDeclarativeDebugConnectionPrivate::connected()
+{
+    QPacket pack;
+    pack << serverId << 0 << protocolVersion << plugins.keys();
+    protocol->send(pack);
+    q->flush();
+}
+
+void QDeclarativeDebugConnectionPrivate::readyRead()
+{
+    if (!gotHello) {
+        QPacket pack = protocol->read();
+        QString name;
+
+        pack >> name;
+
+        bool validHello = false;
+        if (name == clientId) {
+            int op = -1;
+            pack >> op;
+            if (op == 0) {
+                int version = -1;
+                pack >> version;
+                if (version == protocolVersion) {
+                    pack >> serverPlugins;
+                    validHello = true;
+                }
+            }
+        }
+
+        if (!validHello) {
+            qWarning("QDeclarativeDebugConnection: Invalid hello message");
+            QObject::disconnect(protocol, SIGNAL(readyRead()), this, SLOT(readyRead()));
+            return;
+        }
+
+        gotHello = true;
+
+        QHash<QString, QDeclarativeDebugClient *>::Iterator iter = plugins.begin();
+        for (; iter != plugins.end(); ++iter) {
+            QDeclarativeDebugClient::Status newStatus = QDeclarativeDebugClient::Unavailable;
+            if (serverPlugins.contains(iter.key()))
+                newStatus = QDeclarativeDebugClient::Enabled;
+            iter.value()->statusChanged(newStatus);
+        }
+    }
+
+    while (protocol->packetsAvailable()) {
+        QPacket pack = protocol->read();
+        QString name;
+        pack >> name;
+
+        if (name == clientId) {
+            int op = -1;
+            pack >> op;
+
+            if (op == 1) {
+                // Service Discovery
+                QStringList oldServerPlugins = serverPlugins;
+                pack >> serverPlugins;
+
+                QHash<QString, QDeclarativeDebugClient *>::Iterator iter = plugins.begin();
+                for (; iter != plugins.end(); ++iter) {
+                    const QString pluginName = iter.key();
+                    QDeclarativeDebugClient::Status newStatus = QDeclarativeDebugClient::Unavailable;
+                    if (serverPlugins.contains(pluginName))
+                        newStatus = QDeclarativeDebugClient::Enabled;
+
+                    if (oldServerPlugins.contains(pluginName)
+                            != serverPlugins.contains(pluginName)) {
+                        iter.value()->statusChanged(newStatus);
+                    }
+                }
+            } else {
+                qWarning() << "QDeclarativeDebugConnection: Unknown control message id" << op;
+            }
+        } else {
+            QByteArray message;
+            pack >> message;
+
+            QHash<QString, QDeclarativeDebugClient *>::Iterator iter =
+                plugins.find(name);
+            if (iter == plugins.end()) {
+                qWarning() << "QDeclarativeDebugConnection: Message received for missing plugin" << name;
+            } else {
+                (*iter)->messageReceived(message);
+            }
+        }
+    }
+}
+
+QDeclarativeDebugConnection::QDeclarativeDebugConnection(QObject *parent)
+: QTcpSocket(parent), d(new QDeclarativeDebugConnectionPrivate(this))
+{
+}
+
+QDeclarativeDebugConnection::~QDeclarativeDebugConnection()
+{
+    QHash<QString, QDeclarativeDebugClient*>::iterator iter = d->plugins.begin();
+    for (; iter != d->plugins.end(); ++iter) {
+         iter.value()->d_func()->connection = 0;
+         iter.value()->statusChanged(QDeclarativeDebugClient::NotConnected);
+    }
+}
+
+bool QDeclarativeDebugConnection::isConnected() const
+{
+    return state() == ConnectedState;
+}
+
+QDeclarativeDebugClientPrivate::QDeclarativeDebugClientPrivate()
+: connection(0)
+{
+}
+
+QDeclarativeDebugClient::QDeclarativeDebugClient(const QString &name, 
+                                           QDeclarativeDebugConnection *parent)
+: QObject(*(new QDeclarativeDebugClientPrivate), parent)
+{
+    Q_D(QDeclarativeDebugClient);
+    d->name = name;
+    d->connection = parent;
+
+    if (!d->connection)
+        return;
+
+    if (d->connection->d->plugins.contains(name)) {
+        qWarning() << "QDeclarativeDebugClient: Conflicting plugin name" << name;
+        d->connection = 0;
+    } else {
+        d->connection->d->plugins.insert(name, this);
+        d->connection->d->advertisePlugins();
+    }
+}
+
+QDeclarativeDebugClient::~QDeclarativeDebugClient()
+{
+    Q_D(const QDeclarativeDebugClient);
+    if (d->connection && d->connection->d) {
+        d->connection->d->plugins.remove(d->name);
+        d->connection->d->advertisePlugins();
+    }
+}
+
+QString QDeclarativeDebugClient::name() const
+{
+    Q_D(const QDeclarativeDebugClient);
+    return d->name;
+}
+
+QDeclarativeDebugClient::Status QDeclarativeDebugClient::status() const
+{
+    Q_D(const QDeclarativeDebugClient);
+    if (!d->connection
+            || !d->connection->isConnected()
+            || !d->connection->d->gotHello)
+        return NotConnected;
+
+    if (d->connection->d->serverPlugins.contains(d->name))
+        return Enabled;
+
+    return Unavailable;
+}
+
+void QDeclarativeDebugClient::sendMessage(const QByteArray &message)
+{
+    Q_D(QDeclarativeDebugClient);
+
+    if (status() != Enabled)
+        return;
+
+    QPacket pack;
+    pack << d->name << message;
+    d->connection->d->protocol->send(pack);
+    d->connection->d->q->flush();
+}
+
+void QDeclarativeDebugClient::statusChanged(Status)
+{
+}
+
+void QDeclarativeDebugClient::messageReceived(const QByteArray &)
+{
+}
+
+QT_END_NAMESPACE
+
+#include <qdeclarativedebugclient.moc>
diff --git a/src/declarative/debugger/qdeclarativedebugclient_p.h b/src/declarative/debugger/qdeclarativedebugclient_p.h
new file mode 100644
index 0000000000..2f2665e605
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugclient_p.h
@@ -0,0 +1,103 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGCLIENT_H
+#define QDECLARATIVEDEBUGCLIENT_H
+
+#include <QtNetwork/qtcpsocket.h>
+
+#include <private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeDebugConnectionPrivate;
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugConnection : public QTcpSocket
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(QDeclarativeDebugConnection)
+public:
+    QDeclarativeDebugConnection(QObject * = 0);
+    ~QDeclarativeDebugConnection();
+
+    bool isConnected() const;
+private:
+    QDeclarativeDebugConnectionPrivate *d;
+    friend class QDeclarativeDebugClient;
+    friend class QDeclarativeDebugClientPrivate;
+};
+
+class QDeclarativeDebugClientPrivate;
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebugClient : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QDeclarativeDebugClient)
+    Q_DISABLE_COPY(QDeclarativeDebugClient)
+
+public:
+    enum Status { NotConnected, Unavailable, Enabled };
+
+    QDeclarativeDebugClient(const QString &, QDeclarativeDebugConnection *parent);
+    ~QDeclarativeDebugClient();
+
+    QString name() const;
+
+    Status status() const;
+
+    void sendMessage(const QByteArray &);
+
+protected:
+    virtual void statusChanged(Status);
+    virtual void messageReceived(const QByteArray &);
+
+private:
+    friend class QDeclarativeDebugConnection;
+    friend class QDeclarativeDebugConnectionPrivate;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGCLIENT_H
diff --git a/src/declarative/debugger/qdeclarativedebuggerstatus.cpp b/src/declarative/debugger/qdeclarativedebuggerstatus.cpp
new file mode 100644
index 0000000000..dc1e6e7e13
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebuggerstatus.cpp
@@ -0,0 +1,54 @@
+/****************************************************************************
+**
+** 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/qdeclarativedebuggerstatus_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QDeclarativeDebuggerStatus::~QDeclarativeDebuggerStatus()
+{
+}
+
+void QDeclarativeDebuggerStatus::setSelectedState(bool)
+{
+}
+
+QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativedebuggerstatus_p.h b/src/declarative/debugger/qdeclarativedebuggerstatus_p.h
new file mode 100644
index 0000000000..cb79896f26
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebuggerstatus_p.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGGERSTATUS_P_H
+#define QDECLARATIVEDEBUGGERSTATUS_P_H
+
+#include <QtCore/qobject.h>
+
+#include <private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QDeclarativeDebuggerStatus
+{
+public:
+    virtual ~QDeclarativeDebuggerStatus();
+
+    virtual void setSelectedState(bool);
+};
+Q_DECLARE_INTERFACE(QDeclarativeDebuggerStatus, "com.trolltech.qml.QDeclarativeDebuggerStatus")
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QLMDEBUGGERSTATUS_P_H
diff --git a/src/declarative/debugger/qdeclarativedebughelper.cpp b/src/declarative/debugger/qdeclarativedebughelper.cpp
new file mode 100644
index 0000000000..93f7423e4b
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebughelper.cpp
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** 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 <QtScript/QScriptEngine>
+
+#include "private/qdeclarativedebughelper_p.h"
+
+#include <QtCore/QAbstractAnimation>
+#include <QtScript/QScriptEngine>
+
+#include <private/qdeclarativeengine_p.h>
+#include <private/qabstractanimation_p.h>
+#include <private/qdeclarativeengine_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QScriptEngine *QDeclarativeDebugHelper::getScriptEngine(QDeclarativeEngine *engine)
+{
+    return QDeclarativeEnginePrivate::getScriptEngine(engine);
+}
+
+void QDeclarativeDebugHelper::setAnimationSlowDownFactor(qreal factor)
+{
+    QUnifiedTimer *timer = QUnifiedTimer::instance();
+    timer->setSlowModeEnabled(factor != 1.0);
+    timer->setSlowdownFactor(factor);
+}
+
+void QDeclarativeDebugHelper::enableDebugging() {
+#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
+}
+
+QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativedebughelper_p.h b/src/declarative/debugger/qdeclarativedebughelper_p.h
new file mode 100644
index 0000000000..34b4b59c8a
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebughelper_p.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGHELPER_P_H
+#define QDECLARATIVEDEBUGHELPER_P_H
+
+#include <QtCore/qglobal.h>
+
+#include <private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QScriptEngine;
+class QDeclarativeEngine;
+
+// Helper methods to access private API through a stable interface
+// This is used in the qmljsdebugger library of QtCreator.
+class Q_DECLARATIVE_EXPORT QDeclarativeDebugHelper
+{
+public:
+    static QScriptEngine *getScriptEngine(QDeclarativeEngine *engine);
+    static void setAnimationSlowDownFactor(qreal factor);
+
+    // Enables remote debugging functionality
+    // Only use this for debugging in a safe environment!
+    static void enableDebugging();
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGHELPER_P_H
diff --git a/src/declarative/debugger/qdeclarativedebugserver.cpp b/src/declarative/debugger/qdeclarativedebugserver.cpp
new file mode 100644
index 0000000000..6f46354a49
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugserver.cpp
@@ -0,0 +1,375 @@
+/****************************************************************************
+**
+** 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/qdeclarativedebugserver_p.h"
+#include "private/qdeclarativedebugservice_p.h"
+#include "private/qdeclarativedebugservice_p_p.h"
+#include "private/qdeclarativeengine_p.h"
+
+#include <QtCore/QDir>
+#include <QtCore/QPluginLoader>
+#include <QtCore/QStringList>
+
+#include <private/qobject_p.h>
+#include <private/qapplication_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/*
+  QDeclarativeDebug Protocol (Version 1):
+
+  handshake:
+    1. Client sends
+         "QDeclarativeDebugServer" 0 version pluginNames
+       version: an int representing the highest protocol version the client knows
+       pluginNames: plugins available on client side
+    2. Server sends
+         "QDeclarativeDebugClient" 0 version pluginNames
+       version: an int representing the highest protocol version the client & server know
+       pluginNames: plugins available on server side. plugins both in the client and server message are enabled.
+  client plugin advertisement
+    1. Client sends
+         "QDeclarativeDebugServer" 1 pluginNames
+  server plugin advertisement
+    1. Server sends
+         "QDeclarativeDebugClient" 1 pluginNames
+  plugin communication:
+       Everything send with a header different to "QDeclarativeDebugServer" is sent to the appropriate plugin.
+  */
+
+const int protocolVersion = 1;
+
+
+class QDeclarativeDebugServerPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QDeclarativeDebugServer)
+public:
+    QDeclarativeDebugServerPrivate();
+
+    void advertisePlugins();
+
+    QDeclarativeDebugServerConnection *connection;
+    QHash<QString, QDeclarativeDebugService *> plugins;
+    QStringList clientPlugins;
+    bool gotHello;
+
+    static QDeclarativeDebugServerConnection *loadConnectionPlugin(const QString &pluginName);
+};
+
+QDeclarativeDebugServerPrivate::QDeclarativeDebugServerPrivate() :
+    connection(0),
+    gotHello(false)
+{
+}
+
+void QDeclarativeDebugServerPrivate::advertisePlugins()
+{
+    if (!gotHello)
+        return;
+
+    QByteArray message;
+    {
+        QDataStream out(&message, QIODevice::WriteOnly);
+        out << QString(QLatin1String("QDeclarativeDebugClient")) << 1 << plugins.keys();
+    }
+    connection->send(message);
+}
+
+QDeclarativeDebugServerConnection *QDeclarativeDebugServerPrivate::loadConnectionPlugin(
+    const QString &pluginName)
+{
+    QStringList pluginCandidates;
+    const QStringList paths = QCoreApplication::libraryPaths();
+    foreach (const QString &libPath, paths) {
+        const QDir dir(libPath + QLatin1String("/qmltooling"));
+        if (dir.exists()) {
+            QStringList plugins(dir.entryList(QDir::Files));
+            foreach (const QString &pluginPath, plugins) {
+                if (QFileInfo(pluginPath).fileName().contains(pluginName))
+                    pluginCandidates << dir.absoluteFilePath(pluginPath);
+            }
+        }
+    }
+
+    foreach (const QString &pluginPath, pluginCandidates) {
+        QPluginLoader loader(pluginPath);
+        if (!loader.load()) {
+            continue;
+        }
+        QDeclarativeDebugServerConnection *connection = 0;
+        if (QObject *instance = loader.instance())
+            connection = qobject_cast<QDeclarativeDebugServerConnection*>(instance);
+
+        if (connection)
+            return connection;
+        loader.unload();
+    }
+    return 0;
+}
+
+bool QDeclarativeDebugServer::hasDebuggingClient() const
+{
+    Q_D(const QDeclarativeDebugServer);
+    return d->connection
+            && d->connection->isConnected()
+            && d->gotHello;
+}
+
+QDeclarativeDebugServer *QDeclarativeDebugServer::instance()
+{
+    static bool commandLineTested = false;
+    static QDeclarativeDebugServer *server = 0;
+
+    if (!commandLineTested) {
+        commandLineTested = true;
+
+        QApplicationPrivate *appD = static_cast<QApplicationPrivate*>(QObjectPrivate::get(qApp));
+#ifndef QDECLARATIVE_NO_DEBUG_PROTOCOL
+        // ### remove port definition when protocol is changed
+        int port = 0;
+        bool block = false;
+        bool ok = false;
+
+        // format: qmljsdebugger=port:3768[,block] OR qmljsdebugger=ost[,block]
+        if (!appD->qmljsDebugArgumentsString().isEmpty()) {
+            if (!QDeclarativeEnginePrivate::qml_debugging_enabled) {
+                const QString message =
+                    QString::fromAscii("QDeclarativeDebugServer: Ignoring \"-qmljsdebugger=%1\". "
+                              "Debugging has not been enabled.").arg(
+                                  appD->qmljsDebugArgumentsString());
+                qWarning("%s", qPrintable(message));
+                return 0;
+            }
+
+            QString pluginName;
+            if (appD->qmljsDebugArgumentsString().indexOf(QLatin1String("port:")) == 0) {
+                int separatorIndex = appD->qmljsDebugArgumentsString().indexOf(QLatin1Char(','));
+                port = appD->qmljsDebugArgumentsString().mid(5, separatorIndex - 5).toInt(&ok);
+                pluginName = QLatin1String("qmldbg_tcp");
+            } else if (appD->qmljsDebugArgumentsString().contains("ost")) {
+                pluginName = QLatin1String("qmldbg_ost");
+                ok = true;
+            }
+
+            block = appD->qmljsDebugArgumentsString().contains(QLatin1String("block"));
+
+            if (ok) {
+                server = new QDeclarativeDebugServer();
+
+                QDeclarativeDebugServerConnection *connection
+                        = QDeclarativeDebugServerPrivate::loadConnectionPlugin(pluginName);
+                if (connection) {
+                    server->d_func()->connection = connection;
+
+                    connection->setServer(server);
+                    connection->setPort(port, block);
+                } else {
+                    qWarning() << QString::fromAscii("QDeclarativeDebugServer: Ignoring \"-qmljsdebugger=%1\". "
+                                                     "Remote debugger plugin has not been found.").arg(appD->qmljsDebugArgumentsString());
+                }
+
+            } else {
+                qWarning(QString::fromAscii("QDeclarativeDebugServer: Ignoring \"-qmljsdebugger=%1\". "
+                                            "Format is -qmljsdebugger=port:<port>[,block]").arg(
+                             appD->qmljsDebugArgumentsString()).toAscii().constData());
+            }
+        }
+#else
+        if (!appD->qmljsDebugArgumentsString().isEmpty()) {
+            qWarning(QString::fromAscii("QDeclarativeDebugServer: Ignoring \"-qmljsdebugger=%1\". "
+                                        "QtDeclarative is not configured for debugging.").arg(
+                         appD->qmljsDebugArgumentsString()).toAscii().constData());
+        }
+#endif
+    }
+
+    return server;
+}
+
+QDeclarativeDebugServer::QDeclarativeDebugServer()
+: QObject(*(new QDeclarativeDebugServerPrivate))
+{
+}
+
+void QDeclarativeDebugServer::receiveMessage(const QByteArray &message)
+{
+    Q_D(QDeclarativeDebugServer);
+
+    QDataStream in(message);
+    if (!d->gotHello) {
+
+        QString name;
+        int op;
+        in >> name >> op;
+
+        if (name != QLatin1String("QDeclarativeDebugServer")
+                || op != 0) {
+            qWarning("QDeclarativeDebugServer: Invalid hello message");
+            d->connection->disconnect();
+            return;
+        }
+
+        int version;
+        in >> version >> d->clientPlugins;
+
+        QHash<QString, QDeclarativeDebugService*>::Iterator iter = d->plugins.begin();
+        for (; iter != d->plugins.end(); ++iter) {
+            QDeclarativeDebugService::Status newStatus = QDeclarativeDebugService::Unavailable;
+            if (d->clientPlugins.contains(iter.key()))
+                newStatus = QDeclarativeDebugService::Enabled;
+            iter.value()->d_func()->status = newStatus;
+            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 {
+
+        QString debugServer(QLatin1String("QDeclarativeDebugServer"));
+
+        QString name;
+        in >> name;
+
+        if (name == debugServer) {
+            int op = -1;
+            in >> op;
+
+            if (op == 1) {
+                // Service Discovery
+                QStringList oldClientPlugins = d->clientPlugins;
+                in >> d->clientPlugins;
+
+                QHash<QString, QDeclarativeDebugService*>::Iterator iter = d->plugins.begin();
+                for (; iter != d->plugins.end(); ++iter) {
+                    const QString pluginName = iter.key();
+                    QDeclarativeDebugService::Status newStatus = QDeclarativeDebugService::Unavailable;
+                    if (d->clientPlugins.contains(pluginName))
+                        newStatus = QDeclarativeDebugService::Enabled;
+
+                    if (oldClientPlugins.contains(pluginName)
+                            != d->clientPlugins.contains(pluginName)) {
+                        iter.value()->d_func()->status = newStatus;
+                        iter.value()->statusChanged(newStatus);
+                    }
+                }
+            } else {
+                qWarning("QDeclarativeDebugServer: Invalid control message %d", op);
+            }
+        } else {
+            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;
+            } else {
+                (*iter)->messageReceived(message);
+            }
+        }
+    }
+}
+
+QList<QDeclarativeDebugService*> QDeclarativeDebugServer::services() const
+{
+    const Q_D(QDeclarativeDebugServer);
+    return d->plugins.values();
+}
+
+QStringList QDeclarativeDebugServer::serviceNames() const
+{
+    const Q_D(QDeclarativeDebugServer);
+    return d->plugins.keys();
+}
+
+bool QDeclarativeDebugServer::addService(QDeclarativeDebugService *service)
+{
+    Q_D(QDeclarativeDebugServer);
+    if (!service || d->plugins.contains(service->name()))
+        return false;
+
+    d->plugins.insert(service->name(), service);
+    d->advertisePlugins();
+
+    QDeclarativeDebugService::Status newStatus = QDeclarativeDebugService::Unavailable;
+    if (d->clientPlugins.contains(service->name()))
+        newStatus = QDeclarativeDebugService::Enabled;
+    service->d_func()->status = newStatus;
+    service->statusChanged(newStatus);
+    return true;
+}
+
+bool QDeclarativeDebugServer::removeService(QDeclarativeDebugService *service)
+{
+    Q_D(QDeclarativeDebugServer);
+    if (!service || !d->plugins.contains(service->name()))
+        return false;
+
+    d->plugins.remove(service->name());
+    d->advertisePlugins();
+
+    QDeclarativeDebugService::Status newStatus = QDeclarativeDebugService::NotConnected;
+    service->d_func()->server = 0;
+    service->d_func()->status = newStatus;
+    service->statusChanged(newStatus);
+    return true;
+}
+
+void QDeclarativeDebugServer::sendMessage(QDeclarativeDebugService *service,
+                                          const QByteArray &message)
+{
+    Q_D(QDeclarativeDebugServer);
+    QByteArray msg;
+    {
+        QDataStream out(&msg, QIODevice::WriteOnly);
+        out << service->name() << message;
+    }
+    d->connection->send(msg);
+}
+
+QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativedebugserver_p.h b/src/declarative/debugger/qdeclarativedebugserver_p.h
new file mode 100644
index 0000000000..68ea4d8531
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugserver_p.h
@@ -0,0 +1,88 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGSERVER_H
+#define QDECLARATIVEDEBUGSERVER_H
+
+#include <private/qdeclarativeglobal_p.h>
+#include <private/qdeclarativedebugserverconnection_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeDebugService;
+
+class QDeclarativeDebugServerPrivate;
+class Q_DECLARATIVE_EXPORT QDeclarativeDebugServer : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QDeclarativeDebugServer)
+    Q_DISABLE_COPY(QDeclarativeDebugServer)
+public:
+    static QDeclarativeDebugServer *instance();
+
+    void setConnection(QDeclarativeDebugServerConnection *connection);
+
+    bool hasDebuggingClient() const;
+
+    QList<QDeclarativeDebugService*> services() const;
+    QStringList serviceNames() const;
+
+    bool addService(QDeclarativeDebugService *service);
+    bool removeService(QDeclarativeDebugService *service);
+
+    void sendMessage(QDeclarativeDebugService *service, const QByteArray &message);
+    void receiveMessage(const QByteArray &message);
+
+private:
+    friend class QDeclarativeDebugService;
+    friend class QDeclarativeDebugServicePrivate;
+    QDeclarativeDebugServer();
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGSERVICE_H
diff --git a/src/declarative/debugger/qdeclarativedebugserverconnection_p.h b/src/declarative/debugger/qdeclarativedebugserverconnection_p.h
new file mode 100644
index 0000000000..0c2bdb4ef2
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugserverconnection_p.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGSERVERCONNECTION_H
+#define QDECLARATIVEDEBUGSERVERCONNECTION_H
+
+#include <QtDeclarative/private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeDebugServer;
+class Q_DECLARATIVE_EXPORT QDeclarativeDebugServerConnection
+{
+public:
+    QDeclarativeDebugServerConnection() {}
+    virtual ~QDeclarativeDebugServerConnection() {}
+
+    virtual void setServer(QDeclarativeDebugServer *server) = 0;
+    virtual void setPort(int port, bool bock) = 0;
+    virtual bool isConnected() const = 0;
+    virtual void send(const QByteArray &message) = 0;
+    virtual void disconnect() = 0;
+};
+
+Q_DECLARE_INTERFACE(QDeclarativeDebugServerConnection, "com.trolltech.Qt.QDeclarativeDebugServerConnection/1.0")
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGSERVERCONNECTION_H
diff --git a/src/declarative/debugger/qdeclarativedebugservice.cpp b/src/declarative/debugger/qdeclarativedebugservice.cpp
new file mode 100644
index 0000000000..1b39f1c269
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugservice.cpp
@@ -0,0 +1,220 @@
+/****************************************************************************
+**
+** 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/qdeclarativedebugservice_p.h"
+#include "private/qdeclarativedebugservice_p_p.h"
+#include "private/qdeclarativedebugserver_p.h"
+
+#include <QtCore/QDebug>
+#include <QtCore/QStringList>
+
+QT_BEGIN_NAMESPACE
+
+QDeclarativeDebugServicePrivate::QDeclarativeDebugServicePrivate()
+: server(0)
+{
+}
+
+QDeclarativeDebugService::QDeclarativeDebugService(const QString &name, QObject *parent)
+: QObject(*(new QDeclarativeDebugServicePrivate), parent)
+{
+    Q_D(QDeclarativeDebugService);
+    d->name = name;
+    d->server = QDeclarativeDebugServer::instance();
+    d->status = QDeclarativeDebugService::NotConnected;
+
+    if (!d->server)
+        return;
+
+    if (d->server->serviceNames().contains(name)) {
+        qWarning() << "QDeclarativeDebugService: Conflicting plugin name" << name;
+        d->server = 0;
+    } else {
+        d->server->addService(this);
+    }
+}
+
+QDeclarativeDebugService::~QDeclarativeDebugService()
+{
+    Q_D(const QDeclarativeDebugService);
+    if (d->server) {
+        d->server->removeService(this);
+    }
+}
+
+QString QDeclarativeDebugService::name() const
+{
+    Q_D(const QDeclarativeDebugService);
+    return d->name;
+}
+
+QDeclarativeDebugService::Status QDeclarativeDebugService::status() const
+{
+    Q_D(const QDeclarativeDebugService);
+    return d->status;
+}
+
+namespace {
+
+    struct ObjectReference 
+    {
+        QPointer<QObject> object;
+        int id;
+    };
+
+    struct ObjectReferenceHash 
+    {
+        ObjectReferenceHash() : nextId(0) {}
+
+        QHash<QObject *, ObjectReference> objects;
+        QHash<int, QObject *> ids;
+
+        int nextId;
+    };
+
+}
+Q_GLOBAL_STATIC(ObjectReferenceHash, objectReferenceHash);
+
+
+/*!
+    Returns a unique id for \a object.  Calling this method multiple times
+    for the same object will return the same id.
+*/
+int QDeclarativeDebugService::idForObject(QObject *object)
+{
+    if (!object)
+        return -1;
+
+    ObjectReferenceHash *hash = objectReferenceHash();
+    QHash<QObject *, ObjectReference>::Iterator iter = 
+        hash->objects.find(object);
+
+    if (iter == hash->objects.end()) {
+        int id = hash->nextId++;
+
+        hash->ids.insert(id, object);
+        iter = hash->objects.insert(object, ObjectReference());
+        iter->object = object;
+        iter->id = id;
+    } else if (iter->object != object) {
+        int id = hash->nextId++;
+
+        hash->ids.remove(iter->id);
+
+        hash->ids.insert(id, object);
+        iter->object = object;
+        iter->id = id;
+    } 
+    return iter->id;
+}
+
+/*!
+    Returns the object for unique \a id.  If the object has not previously been
+    assigned an id, through idForObject(), then 0 is returned.  If the object
+    has been destroyed, 0 is returned.
+*/
+QObject *QDeclarativeDebugService::objectForId(int id)
+{
+    ObjectReferenceHash *hash = objectReferenceHash();
+
+    QHash<int, QObject *>::Iterator iter = hash->ids.find(id);
+    if (iter == hash->ids.end())
+        return 0;
+
+
+    QHash<QObject *, ObjectReference>::Iterator objIter = 
+        hash->objects.find(*iter);
+    Q_ASSERT(objIter != hash->objects.end());
+
+    if (objIter->object == 0) {
+        hash->ids.erase(iter);
+        hash->objects.erase(objIter);
+        return 0;
+    } else {
+        return *iter;
+    }
+}
+
+bool QDeclarativeDebugService::isDebuggingEnabled()
+{
+    return QDeclarativeDebugServer::instance() != 0;
+}
+
+bool QDeclarativeDebugService::hasDebuggingClient()
+{
+    return QDeclarativeDebugServer::instance() != 0
+            && QDeclarativeDebugServer::instance()->hasDebuggingClient();
+}
+
+QString QDeclarativeDebugService::objectToString(QObject *obj)
+{
+    if(!obj)
+        return QLatin1String("NULL");
+
+    QString objectName = obj->objectName();
+    if(objectName.isEmpty())
+        objectName = QLatin1String("<unnamed>");
+
+    QString rv = QString::fromUtf8(obj->metaObject()->className()) + 
+                 QLatin1String(": ") + objectName;
+
+    return rv;
+}
+
+void QDeclarativeDebugService::sendMessage(const QByteArray &message)
+{
+    Q_D(QDeclarativeDebugService);
+
+    if (status() != Enabled)
+        return;
+
+    d->server->sendMessage(this, message);
+}
+
+void QDeclarativeDebugService::statusChanged(Status)
+{
+}
+
+void QDeclarativeDebugService::messageReceived(const QByteArray &)
+{
+}
+
+QT_END_NAMESPACE
diff --git a/src/declarative/debugger/qdeclarativedebugservice_p.h b/src/declarative/debugger/qdeclarativedebugservice_p.h
new file mode 100644
index 0000000000..5e30350abf
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugservice_p.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGSERVICE_H
+#define QDECLARATIVEDEBUGSERVICE_H
+
+#include <QtCore/qobject.h>
+
+#include <private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeDebugServicePrivate;
+class Q_DECLARATIVE_EXPORT QDeclarativeDebugService : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QDeclarativeDebugService)
+    Q_DISABLE_COPY(QDeclarativeDebugService)
+
+public:
+    explicit QDeclarativeDebugService(const QString &, QObject *parent = 0);
+    ~QDeclarativeDebugService();
+
+    QString name() const;
+
+    enum Status { NotConnected, Unavailable, Enabled };
+    Status status() const;
+
+    void sendMessage(const QByteArray &);
+
+    static int idForObject(QObject *);
+    static QObject *objectForId(int);
+
+    static QString objectToString(QObject *obj);
+
+    static bool isDebuggingEnabled();
+    static bool hasDebuggingClient();
+
+protected:
+    virtual void statusChanged(Status);
+    virtual void messageReceived(const QByteArray &);
+
+private:
+    friend class QDeclarativeDebugServer;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGSERVICE_H
+
diff --git a/src/declarative/debugger/qdeclarativedebugservice_p_p.h b/src/declarative/debugger/qdeclarativedebugservice_p_p.h
new file mode 100644
index 0000000000..d0423f79f8
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugservice_p_p.h
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGSERVICE_P_H
+#define QDECLARATIVEDEBUGSERVICE_P_H
+
+#include <QtCore/qglobal.h>
+#include <private/qobject_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QDeclarativeDebugServer;
+
+class QDeclarativeDebugServicePrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QDeclarativeDebugService)
+public:
+    QDeclarativeDebugServicePrivate();
+
+    QString name;
+    QDeclarativeDebugServer *server;
+    QDeclarativeDebugService::Status status;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGSERVICE_P_H
diff --git a/src/declarative/debugger/qdeclarativedebugtrace.cpp b/src/declarative/debugger/qdeclarativedebugtrace.cpp
new file mode 100644
index 0000000000..6f28736f52
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugtrace.cpp
@@ -0,0 +1,218 @@
+/****************************************************************************
+**
+** 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 "qdeclarativedebugtrace_p.h"
+
+#include <QtCore/qdatastream.h>
+#include <QtCore/qurl.h>
+#include <QtCore/qtimer.h>
+
+Q_GLOBAL_STATIC(QDeclarativeDebugTrace, traceInstance);
+
+// convert to a QByteArray that can be sent to the debug client
+// use of QDataStream can skew results if m_deferredSend == false
+//     (see tst_qperformancetimer::trace() benchmark)
+QByteArray QDeclarativeDebugData::toByteArray() const
+{
+    QByteArray data;
+    //### using QDataStream is relatively expensive
+    QDataStream ds(&data, QIODevice::WriteOnly);
+    ds << time << messageType << detailType;
+    if (messageType == (int)QDeclarativeDebugTrace::RangeData)
+        ds << detailData;
+    if (messageType == (int)QDeclarativeDebugTrace::RangeLocation)
+        ds << detailData << line;
+    return data;
+}
+
+QDeclarativeDebugTrace::QDeclarativeDebugTrace()
+: QDeclarativeDebugService(QLatin1String("CanvasFrameRate")),
+  m_enabled(false), m_deferredSend(true)
+{
+    m_timer.start();
+}
+
+void QDeclarativeDebugTrace::addEvent(EventType t)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled()) 
+        traceInstance()->addEventImpl(t);
+}
+
+void QDeclarativeDebugTrace::startRange(RangeType t)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled()) 
+        traceInstance()->startRangeImpl(t);
+}
+
+void QDeclarativeDebugTrace::rangeData(RangeType t, const QString &data)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled()) 
+        traceInstance()->rangeDataImpl(t, data);
+}
+
+void QDeclarativeDebugTrace::rangeData(RangeType t, const QUrl &data)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled())
+        traceInstance()->rangeDataImpl(t, data);
+}
+
+void QDeclarativeDebugTrace::rangeLocation(RangeType t, const QString &fileName, int line)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled())
+        traceInstance()->rangeLocationImpl(t, fileName, line);
+}
+
+void QDeclarativeDebugTrace::rangeLocation(RangeType t, const QUrl &fileName, int line)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled())
+        traceInstance()->rangeLocationImpl(t, fileName, line);
+}
+
+void QDeclarativeDebugTrace::endRange(RangeType t)
+{
+    if (QDeclarativeDebugService::isDebuggingEnabled()) 
+        traceInstance()->endRangeImpl(t);
+}
+
+void QDeclarativeDebugTrace::addEventImpl(EventType event)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData ed = {m_timer.elapsed(), (int)Event, (int)event, QString(), -1};
+    processMessage(ed);
+}
+
+void QDeclarativeDebugTrace::startRangeImpl(RangeType range)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeStart, (int)range, QString(), -1};
+    processMessage(rd);
+}
+
+void QDeclarativeDebugTrace::rangeDataImpl(RangeType range, const QString &rData)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeData, (int)range, rData, -1};
+    processMessage(rd);
+}
+
+void QDeclarativeDebugTrace::rangeDataImpl(RangeType range, const QUrl &rData)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeData, (int)range, rData.toString(QUrl::FormattingOption(0x100)), -1};
+    processMessage(rd);
+}
+
+void QDeclarativeDebugTrace::rangeLocationImpl(RangeType range, const QString &fileName, int line)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeLocation, (int)range, fileName, line};
+    processMessage(rd);
+}
+
+void QDeclarativeDebugTrace::rangeLocationImpl(RangeType range, const QUrl &fileName, int line)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeLocation, (int)range, fileName.toString(QUrl::FormattingOption(0x100)), line};
+    processMessage(rd);
+}
+
+void QDeclarativeDebugTrace::endRangeImpl(RangeType range)
+{
+    if (status() != Enabled || !m_enabled)
+        return;
+
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeEnd, (int)range, QString(), -1};
+    processMessage(rd);
+}
+
+/*
+    Either send the message directly, or queue up
+    a list of messages to send later (via sendMessages)
+*/
+void QDeclarativeDebugTrace::processMessage(const QDeclarativeDebugData &message)
+{
+    if (m_deferredSend)
+        m_data.append(message);
+    else
+        sendMessage(message.toByteArray());
+}
+
+/*
+    Send the messages queued up by processMessage
+*/
+void QDeclarativeDebugTrace::sendMessages()
+{
+    if (m_deferredSend) {
+        //### this is a suboptimal way to send batched messages
+        for (int i = 0; i < m_data.count(); ++i)
+            sendMessage(m_data.at(i).toByteArray());
+        m_data.clear();
+
+        //indicate completion
+        QByteArray data;
+        QDataStream ds(&data, QIODevice::WriteOnly);
+        ds << (qint64)-1 << (int)Complete;
+        sendMessage(data);
+    }
+}
+
+void QDeclarativeDebugTrace::messageReceived(const QByteArray &message)
+{
+    QByteArray rwData = message;
+    QDataStream stream(&rwData, QIODevice::ReadOnly);
+
+    stream >> m_enabled;
+
+    if (!m_enabled)
+        sendMessages();
+}
diff --git a/src/declarative/debugger/qdeclarativedebugtrace_p.h b/src/declarative/debugger/qdeclarativedebugtrace_p.h
new file mode 100644
index 0000000000..ae0653ee71
--- /dev/null
+++ b/src/declarative/debugger/qdeclarativedebugtrace_p.h
@@ -0,0 +1,131 @@
+/****************************************************************************
+**
+** 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 QDECLARATIVEDEBUGTRACE_P_H
+#define QDECLARATIVEDEBUGTRACE_P_H
+
+#include <private/qdeclarativedebugservice_p.h>
+#include <private/qperformancetimer_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+struct QDeclarativeDebugData
+{
+    qint64 time;
+    int messageType;
+    int detailType;
+
+    //###
+    QString detailData; //used by RangeData and RangeLocation
+    int line;           //used by RangeLocation
+
+    QByteArray toByteArray() const;
+};
+
+class QUrl;
+class Q_AUTOTEST_EXPORT QDeclarativeDebugTrace : public QDeclarativeDebugService
+{
+public:
+    enum Message {
+        Event,
+        RangeStart,
+        RangeData,
+        RangeLocation,
+        RangeEnd,
+        Complete,
+
+        MaximumMessage
+    };
+
+    enum EventType {
+        FramePaint,
+        Mouse,
+        Key,
+
+        MaximumEventType
+    };
+
+    enum RangeType {
+        Painting,
+        Compiling,
+        Creating,
+        Binding,            //running a binding
+        HandlingSignal,     //running a signal handler
+
+        MaximumRangeType
+    };
+
+    static void addEvent(EventType);
+
+    static void startRange(RangeType);
+    static void rangeData(RangeType, const QString &);
+    static void rangeData(RangeType, const QUrl &);
+    static void rangeLocation(RangeType, const QString &, int);
+    static void rangeLocation(RangeType, const QUrl &, int);
+    static void endRange(RangeType);
+
+    QDeclarativeDebugTrace();
+protected:
+    virtual void messageReceived(const QByteArray &);
+private:
+    void addEventImpl(EventType);
+    void startRangeImpl(RangeType);
+    void rangeDataImpl(RangeType, const QString &);
+    void rangeDataImpl(RangeType, const QUrl &);
+    void rangeLocationImpl(RangeType, const QString &, int);
+    void rangeLocationImpl(RangeType, const QUrl &, int);
+    void endRangeImpl(RangeType);
+    void processMessage(const QDeclarativeDebugData &);
+    void sendMessages();
+    QPerformanceTimer m_timer;
+    bool m_enabled;
+    bool m_deferredSend;
+    QList<QDeclarativeDebugData> m_data;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QDECLARATIVEDEBUGTRACE_P_H
+
diff --git a/src/declarative/debugger/qpacketprotocol.cpp b/src/declarative/debugger/qpacketprotocol.cpp
new file mode 100644
index 0000000000..15a14cf9f4
--- /dev/null
+++ b/src/declarative/debugger/qpacketprotocol.cpp
@@ -0,0 +1,507 @@
+/****************************************************************************
+**
+** 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/qpacketprotocol_p.h"
+
+#include <QBuffer>
+
+QT_BEGIN_NAMESPACE
+
+#define MAX_PACKET_SIZE 0x7FFFFFFF
+
+/*!
+  \class QPacketProtocol
+  \internal
+
+  \brief The QPacketProtocol class encapsulates communicating discrete packets
+  across fragmented IO channels, such as TCP sockets.
+
+  QPacketProtocol makes it simple to send arbitrary sized data "packets" across 
+  fragmented transports such as TCP and UDP.
+
+  As transmission boundaries are not respected, sending packets over protocols
+  like TCP frequently involves "stitching" them back together at the receiver.
+  QPacketProtocol makes this easier by performing this task for you.  Packet
+  data sent using QPacketProtocol is prepended with a 4-byte size header
+  allowing the receiving QPacketProtocol to buffer the packet internally until
+  it has all been received.  QPacketProtocol does not perform any sanity
+  checking on the size or on the data, so this class should only be used in
+  prototyping or trusted situations where DOS attacks are unlikely.
+
+  QPacketProtocol does not perform any communications itself.  Instead it can
+  operate on any QIODevice that supports the QIODevice::readyRead() signal.  A
+  logical "packet" is encapsulated by the companion QPacket class.  The
+  following example shows two ways to send data using QPacketProtocol.  The
+  transmitted data is equivalent in both.
+
+  \code
+  QTcpSocket socket;
+  // ... connect socket ...
+
+  QPacketProtocol protocol(&socket);
+
+  // Send packet the quick way
+  protocol.send() << "Hello world" << 123;
+
+  // Send packet the longer way
+  QPacket packet;
+  packet << "Hello world" << 123;
+  protocol.send(packet);
+  \endcode
+
+  Likewise, the following shows how to read data from QPacketProtocol, assuming
+  that the QPacketProtocol::readyRead() signal has been emitted.
+
+  \code
+  // ... QPacketProtocol::readyRead() is emitted ...
+
+  int a;
+  QByteArray b;
+
+  // Receive packet the quick way
+  protocol.read() >> a >> b;
+
+  // Receive packet the longer way
+  QPacket packet = protocol.read();
+  p >> a >> b;
+  \endcode
+
+  \ingroup io
+  \sa QPacket
+*/
+
+class QPacketProtocolPrivate : public QObject
+{
+Q_OBJECT
+public:
+    QPacketProtocolPrivate(QPacketProtocol * parent, QIODevice * _dev)
+    : QObject(parent), inProgressSize(-1), maxPacketSize(MAX_PACKET_SIZE),
+      dev(_dev)
+    {
+        Q_ASSERT(4 == sizeof(qint32));
+
+        QObject::connect(this, SIGNAL(readyRead()),
+                         parent, SIGNAL(readyRead()));
+        QObject::connect(this, SIGNAL(packetWritten()),
+                         parent, SIGNAL(packetWritten()));
+        QObject::connect(this, SIGNAL(invalidPacket()),
+                         parent, SIGNAL(invalidPacket()));
+        QObject::connect(dev, SIGNAL(readyRead()),
+                         this, SLOT(readyToRead()), Qt::QueuedConnection);
+        QObject::connect(dev, SIGNAL(aboutToClose()),
+                         this, SLOT(aboutToClose()));
+        QObject::connect(dev, SIGNAL(bytesWritten(qint64)),
+                         this, SLOT(bytesWritten(qint64)));
+    }
+
+Q_SIGNALS:
+    void readyRead();
+    void packetWritten();
+    void invalidPacket();
+
+public Q_SLOTS:
+    void aboutToClose()
+    {
+        inProgress.clear();
+        sendingPackets.clear();
+        inProgressSize = -1;
+    }
+
+    void bytesWritten(qint64 bytes)
+    {
+        Q_ASSERT(!sendingPackets.isEmpty());
+
+        while(bytes) {
+            if(sendingPackets.at(0) > bytes) {
+                sendingPackets[0] -= bytes;
+                bytes = 0;
+            } else {
+                bytes -= sendingPackets.at(0);
+                sendingPackets.removeFirst();
+                emit packetWritten();
+            }
+        }
+    }
+
+    void readyToRead()
+    {
+        if(-1 == inProgressSize) {
+            // We need a size header of sizeof(qint32)
+            if(sizeof(qint32) > (uint)dev->bytesAvailable())
+                return;
+
+            // Read size header
+            int read = dev->read((char *)&inProgressSize, sizeof(qint32));
+            Q_ASSERT(read == sizeof(qint32));
+            Q_UNUSED(read);
+
+            // Check sizing constraints
+            if(inProgressSize > maxPacketSize) {
+                QObject::disconnect(dev, SIGNAL(readyRead()),
+                                    this, SLOT(readyToRead()));
+                QObject::disconnect(dev, SIGNAL(aboutToClose()),
+                                    this, SLOT(aboutToClose()));
+                QObject::disconnect(dev, SIGNAL(bytesWritten(qint64)),
+                                    this, SLOT(bytesWritten(qint64)));
+                dev = 0;
+                emit invalidPacket();
+                return;
+            }
+
+            inProgressSize -= sizeof(qint32);
+
+            // Need to get trailing data
+            readyToRead();
+        } else {
+            inProgress.append(dev->read(inProgressSize - inProgress.size()));
+
+            if(inProgressSize == inProgress.size()) {
+                // Packet has arrived!
+                packets.append(inProgress);
+                inProgressSize = -1;
+                inProgress.clear();
+
+                emit readyRead();
+
+                // Need to get trailing data
+                readyToRead();
+            }
+        }
+    }
+
+public:
+    QList<qint64> sendingPackets;
+    QList<QByteArray> packets;
+    QByteArray inProgress;
+    qint32 inProgressSize;
+    qint32 maxPacketSize;
+    QIODevice * dev;
+};
+
+/*!
+  Construct a QPacketProtocol instance that works on \a dev with the
+  specified \a parent.
+ */
+QPacketProtocol::QPacketProtocol(QIODevice * dev, QObject * parent)
+: QObject(parent), d(new QPacketProtocolPrivate(this, dev))
+{
+    Q_ASSERT(dev);
+}
+
+/*!
+  Destroys the QPacketProtocol instance.
+ */
+QPacketProtocol::~QPacketProtocol()
+{
+}
+
+/*!
+  Returns the maximum packet size allowed.  By default this is
+  2,147,483,647 bytes.  
+  
+  If a packet claiming to be larger than the maximum packet size is received,
+  the QPacketProtocol::invalidPacket() signal is emitted.
+
+  \sa QPacketProtocol::setMaximumPacketSize()
+ */
+qint32 QPacketProtocol::maximumPacketSize() const
+{
+    return d->maxPacketSize;
+}
+
+/*!
+  Sets the maximum allowable packet size to \a max.
+
+  \sa QPacketProtocol::maximumPacketSize()
+ */
+qint32 QPacketProtocol::setMaximumPacketSize(qint32 max)
+{
+    if(max > (signed)sizeof(qint32))
+        d->maxPacketSize = max;
+    return d->maxPacketSize;
+}
+
+/*!
+  Returns a streamable object that is transmitted on destruction.  For example
+
+  \code
+  protocol.send() << "Hello world" << 123;
+  \endcode
+
+  will send a packet containing "Hello world" and 123.  To construct more 
+  complex packets, explicitly construct a QPacket instance.
+ */
+QPacketAutoSend QPacketProtocol::send()
+{
+    return QPacketAutoSend(this);
+}
+
+/*!
+  \fn void QPacketProtocol::send(const QPacket & packet)
+
+  Transmit the \a packet.
+ */
+void QPacketProtocol::send(const QPacket & p)
+{
+    if(p.b.isEmpty())
+        return; // We don't send empty packets
+
+    qint64 sendSize = p.b.size() + sizeof(qint32);
+
+    d->sendingPackets.append(sendSize);
+    qint32 sendSize32 = sendSize;
+    qint64 writeBytes = d->dev->write((char *)&sendSize32, sizeof(qint32));
+    Q_ASSERT(writeBytes == sizeof(qint32));
+    writeBytes = d->dev->write(p.b);
+    Q_ASSERT(writeBytes == p.b.size());
+}
+
+/*!
+  Returns the number of received packets yet to be read.
+  */
+qint64 QPacketProtocol::packetsAvailable() const
+{
+    return d->packets.count();
+}
+
+/*!
+  Discard any unread packets.
+  */
+void QPacketProtocol::clear()
+{
+    d->packets.clear();
+}
+
+/*!
+  Return the next unread packet, or an invalid QPacket instance if no packets
+  are available.  This method does NOT block.
+  */
+QPacket QPacketProtocol::read()
+{
+    if(0 == d->packets.count())
+        return QPacket();
+
+    QPacket rv(d->packets.at(0));
+    d->packets.removeFirst();
+    return rv;
+}
+
+/*!
+  Return the QIODevice passed to the QPacketProtocol constructor.
+*/
+QIODevice * QPacketProtocol::device()
+{
+    return d->dev;
+}
+
+/*!
+  \fn void QPacketProtocol::readyRead()
+
+  Emitted whenever a new packet is received.  Applications may use
+  QPacketProtocol::read() to retrieve this packet.
+ */
+
+/*!
+  \fn void QPacketProtocol::invalidPacket()
+
+  A packet larger than the maximum allowable packet size was received.  The
+  packet will be discarded and, as it indicates corruption in the protocol, no
+  further packets will be received.
+ */
+
+/*!
+  \fn void QPacketProtocol::packetWritten()
+
+  Emitted each time a packet is completing written to the device.  This signal
+  may be used for communications flow control.
+ */
+
+/*!
+  \class QPacket
+  \internal
+
+  \brief The QPacket class encapsulates an unfragmentable packet of data to be
+  transmitted by QPacketProtocol.
+
+  The QPacket class works together with QPacketProtocol to make it simple to
+  send arbitrary sized data "packets" across fragmented transports such as TCP
+  and UDP.
+
+  QPacket provides a QDataStream interface to an unfragmentable packet.
+  Applications should construct a QPacket, propagate it with data and then
+  transmit it over a QPacketProtocol instance.  For example:
+  \code
+  QPacketProtocol protocol(...);
+
+  QPacket myPacket;
+  myPacket << "Hello world!" << 123;
+  protocol.send(myPacket);
+  \endcode
+
+  As long as both ends of the connection are using the QPacketProtocol class,
+  the data within this packet will be delivered unfragmented at the other end,
+  ready for extraction.
+
+  \code
+  QByteArray greeting;
+  int count;
+
+  QPacket myPacket = protocol.read();
+
+  myPacket >> greeting >> count;
+  \endcode
+
+  Only packets returned from QPacketProtocol::read() may be read from.  QPacket
+  instances constructed by directly by applications are for transmission only 
+  and are considered "write only".  Attempting to read data from them will 
+  result in undefined behavior.
+
+  \ingroup io
+  \sa QPacketProtocol
+ */
+
+/*!
+  Constructs an empty write-only packet.
+  */
+QPacket::QPacket()
+: QDataStream(), buf(0)
+{
+    buf = new QBuffer(&b);
+    buf->open(QIODevice::WriteOnly);
+    setDevice(buf);
+    setVersion(QDataStream::Qt_4_7);
+}
+
+/*!
+  Destroys the QPacket instance.
+  */
+QPacket::~QPacket()
+{
+    if(buf) {
+        delete buf;
+        buf = 0;
+    }
+}
+
+/*!
+  Creates a copy of \a other.  The initial stream positions are shared, but the
+  two packets are otherwise independent.
+ */
+QPacket::QPacket(const QPacket & other)
+: QDataStream(), b(other.b), buf(0)
+{
+    buf = new QBuffer(&b);
+    buf->open(other.buf->openMode());
+    setDevice(buf);
+}
+
+/*!
+  \internal
+  */
+QPacket::QPacket(const QByteArray & ba)
+: QDataStream(), b(ba), buf(0)
+{
+    buf = new QBuffer(&b);
+    buf->open(QIODevice::ReadOnly);
+    setDevice(buf);
+}
+
+/*!
+  Returns true if this packet is empty - that is, contains no data.
+  */
+bool QPacket::isEmpty() const
+{
+    return b.isEmpty();
+}
+
+/*!
+  Returns raw packet data.
+  */
+QByteArray QPacket::data() const
+{
+    return b;
+}
+
+/*!
+  Clears data in the packet.  This is useful for reusing one writable packet.
+  For example
+  \code
+  QPacketProtocol protocol(...);
+
+  QPacket packet;
+
+  packet << "Hello world!" << 123;
+  protocol.send(packet);
+
+  packet.clear();
+  packet << "Goodbyte world!" << 789;
+  protocol.send(packet);
+  \endcode
+ */
+void QPacket::clear()
+{
+    QBuffer::OpenMode oldMode = buf->openMode();
+    buf->close();
+    b.clear();
+    buf->setBuffer(&b); // reset QBuffer internals with new size of b.
+    buf->open(oldMode);
+}
+
+/*!
+  \class QPacketAutoSend
+  \internal
+
+  \internal
+  */
+QPacketAutoSend::QPacketAutoSend(QPacketProtocol * _p)
+: QPacket(), p(_p)
+{
+}
+
+QPacketAutoSend::~QPacketAutoSend()
+{
+    if(!b.isEmpty())
+        p->send(*this);
+}
+
+QT_END_NAMESPACE
+
+#include <qpacketprotocol.moc>
diff --git a/src/declarative/debugger/qpacketprotocol_p.h b/src/declarative/debugger/qpacketprotocol_p.h
new file mode 100644
index 0000000000..accb8efa67
--- /dev/null
+++ b/src/declarative/debugger/qpacketprotocol_p.h
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** 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 QPACKETPROTOCOL_H
+#define QPACKETPROTOCOL_H
+
+#include <QtCore/qobject.h>
+#include <QtCore/qdatastream.h>
+
+#include <private/qdeclarativeglobal_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QIODevice;
+class QBuffer;
+class QPacket;
+class QPacketAutoSend;
+class QPacketProtocolPrivate;
+
+class Q_DECLARATIVE_EXPORT QPacketProtocol : public QObject
+{
+Q_OBJECT
+public:
+    explicit QPacketProtocol(QIODevice * dev, QObject * parent = 0);
+    virtual ~QPacketProtocol();
+
+    qint32 maximumPacketSize() const;
+    qint32 setMaximumPacketSize(qint32);
+
+    QPacketAutoSend send();
+    void send(const QPacket &);
+
+    qint64 packetsAvailable() const;
+    QPacket read();
+
+    void clear();
+
+    QIODevice * device();
+
+Q_SIGNALS:
+    void readyRead();
+    void invalidPacket();
+    void packetWritten();
+
+private:
+    QPacketProtocolPrivate * d;
+};
+
+
+class Q_DECLARATIVE_EXPORT QPacket : public QDataStream
+{
+public:
+    QPacket();
+    QPacket(const QPacket &);
+    virtual ~QPacket();
+
+    void clear();
+    bool isEmpty() const;
+    QByteArray data() const;
+
+protected:
+    friend class QPacketProtocol;
+    QPacket(const QByteArray & ba);
+    QByteArray b;
+    QBuffer * buf;
+};
+
+class Q_DECLARATIVE_PRIVATE_EXPORT QPacketAutoSend : public QPacket
+{
+public:
+    virtual ~QPacketAutoSend();
+
+private:
+    friend class QPacketProtocol;
+    QPacketAutoSend(QPacketProtocol *);
+    QPacketProtocol * p;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif