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diff --git a/src/qml/debugger/qqmldebug.cpp b/src/qml/debugger/qqmldebug.cpp
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+++ b/src/qml/debugger/qqmldebug.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qqmldebug.h"
+#include "qqmldebugconnector_p.h"
+
+#include <private/qqmlengine_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQmlDebuggingEnabler::QQmlDebuggingEnabler(bool printWarning)
+{
+#ifndef QQML_NO_DEBUG_PROTOCOL
+    if (!QQmlEnginePrivate::qml_debugging_enabled
+            && printWarning) {
+        qDebug("QML debugging is enabled. Only use this in a safe environment.");
+    }
+    QQmlEnginePrivate::qml_debugging_enabled = true;
+#else
+    Q_UNUSED(printWarning);
+#endif
+}
+
+/*!
+ * \enum QQmlDebuggingEnabler::StartMode
+ *
+ * Defines the debug server's start behavior. You can interrupt QML engines starting while a debug
+ * client is connecting, in order to set breakpoints in or profile startup code.
+ *
+ * \value DoNotWaitForClient Run any QML engines as usual while the debug services are connecting.
+ * \value WaitForClient      If a QML engine starts while the debug services are connecting,
+ *                           interrupt it until they are done.
+ */
+
+/*!
+ * Enables debugging for QML engines created after calling this function. The debug server will
+ * listen on \a port at \a hostName and block the QML engine until it receives a connection if
+ * \a mode is \c WaitForClient. If \a mode is not specified it won't block and if \a hostName is not
+ * specified it will listen on all available interfaces. You can only start one debug server at a
+ * time. A debug server may have already been started if the -qmljsdebugger= command line argument
+ * was given. This method returns \c true if a new debug server was successfully started, or
+ * \c false otherwise.
+ */
+bool QQmlDebuggingEnabler::startTcpDebugServer(int port, StartMode mode, const QString &hostName)
+{
+#ifndef QQML_NO_DEBUG_PROTOCOL
+    QQmlDebugConnector::setPluginKey(QLatin1String("QQmlDebugServer"));
+    QQmlDebugConnector *connector = QQmlDebugConnector::instance();
+    if (connector) {
+        QVariantHash configuration;
+        configuration[QLatin1String("portFrom")] = configuration[QLatin1String("portTo")] = port;
+        configuration[QLatin1String("block")] = (mode == WaitForClient);
+        configuration[QLatin1String("hostAddress")] = hostName;
+        return connector->open(configuration);
+    }
+#else
+    Q_UNUSED(port);
+    Q_UNUSED(block);
+    Q_UNUSED(hostName);
+#endif
+    return false;
+}
+
+/*!
+ * \since 5.6
+ *
+ * Enables debugging for QML engines created after calling this function. The debug server will
+ * connect to a debugger waiting on a local socket at the given \a socketFileName and block the QML
+ * engine until the connection is established if \a mode is \c WaitForClient. If \a mode is not
+ * specified it will not block. You can only start one debug server at a time. A debug server may
+ * have already been started if the -qmljsdebugger= command line argument was given. This method
+ * returns \c true if a new debug server was successfully started, or \c false otherwise.
+ */
+bool QQmlDebuggingEnabler::connectToLocalDebugger(const QString &socketFileName, StartMode mode)
+{
+#ifndef QQML_NO_DEBUG_PROTOCOL
+    QQmlDebugConnector::setPluginKey(QLatin1String("QQmlDebugServer"));
+    QQmlDebugConnector *connector = QQmlDebugConnector::instance();
+    if (connector) {
+        QVariantHash configuration;
+        configuration[QLatin1String("fileName")] = socketFileName;
+        configuration[QLatin1String("block")] = (mode == WaitForClient);
+        return connector->open(configuration);
+    }
+#else
+    Q_UNUSED(fileName);
+    Q_UNUSED(block);
+#endif
+    return false;
+}
+
+QT_END_NAMESPACE