Add debug plugin manager

When splitting the QML tooling into several plugins we need a unified
way to load them.

Change-Id: I3e17dc5e9427cc45db962f7fa0a695514544d64c
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

src/qml/debugger/debugger.pri

@@ -15,6 +15,7 @@ SOURCES += \
     $$PWD/qqmlprofiler.cpp
 
 HEADERS += \
+    $$PWD/qqmldebugpluginmanager_p.h \
     $$PWD/qqmldebugservice_p.h \
     $$PWD/qqmldebugservice_p_p.h \
     $$PWD/qqmlprofilerservice_p.h \

src/qml/debugger/qqmldebugpluginmanager_p.h

@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQMLDEBUGPLUGINMANAGER_P_H
+#define QQMLDEBUGPLUGINMANAGER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QDebug>
+#include <private/qtqmlglobal_p.h>
+#include <private/qfactoryloader_p.h>
+
+QT_BEGIN_NAMESPACE
+
+#if defined(QT_NO_QML_DEBUGGER)
+
+#define Q_QML_DEBUG_PLUGIN_LOADER(interfaceName)\
+    interfaceName *load##interfaceName(const QString &key)\
+    {\
+        qWarning() << "Qml Debugger: QtQml is not configured for debugging. Ignoring request for"\
+                   << "debug plugin" << key;\
+        return 0;\
+    }\
+    QList<QJsonObject> metaDataFor##interfaceName()\
+    {\
+        return QList<QJsonObject();\
+    }
+#define Q_QML_IMPORT_DEBUG_PLUGIN(className)
+
+#else // QT_NO_QML_DEBUGGER
+
+#ifdef QT_STATIC
+#define Q_QML_IMPORT_DEBUG_PLUGIN(className)\
+    Q_IMPORT_PLUGIN(className)
+#else
+#define Q_QML_IMPORT_DEBUG_PLUGIN(className)
+#endif // QT_STATIC
+
+#define Q_QML_DEBUG_PLUGIN_LOADER(interfaceName)\
+    Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, interfaceName##Loader,\
+        (interfaceName##Factory_iid, QLatin1String("/qmltooling")))\
+    interfaceName *load##interfaceName(const QString &key)\
+    {\
+        return qLoadPlugin<interfaceName, interfaceName##Factory>(interfaceName##Loader(), key);\
+    }\
+    QList<QJsonObject> metaDataFor##interfaceName()\
+    {\
+        return interfaceName##Loader()->metaData();\
+    }
+
+#endif // QT_NO_QML_DEBUGGER
+
+QT_END_NAMESPACE
+#endif // QQMLDEBUGPLUGINMANAGER_P_H