debugger: refactoring of the plugin interface

There's  some 'external' and some 'internal' part now. Other plugins
are only supposed the external interface.

29 files changed, 437 insertions, 547 deletions

diff --git a/src/plugins/debugger/breakhandler.cpp b/src/plugins/debugger/breakhandler.cpp
index be2310effb..23e296457f 100644
--- a/src/plugins/debugger/breakhandler.cpp
+++ b/src/plugins/debugger/breakhandler.cpp
@@ -31,7 +31,7 @@
 #include "breakpointmarker.h"
 
 #include "debuggeractions.h"
-#include "debuggerplugin.h"
+#include "debuggercore.h"
 #include "debuggerstringutils.h"
 
 #include <utils/qtcassert.h>
@@ -40,17 +40,15 @@
 #include <QtCore/QFileInfo>
 
 
-namespace Debugger {
-namespace Internal {
-
-static DebuggerPlugin *plugin() { return DebuggerPlugin::instance(); }
-
 //////////////////////////////////////////////////////////////////
 //
 // BreakHandler
 //
 //////////////////////////////////////////////////////////////////
 
+namespace Debugger {
+namespace Internal {
+
 BreakHandler::BreakHandler()
   : m_breakpointIcon(_(":/debugger/images/breakpoint_16.png")),
     m_disabledBreakpointIcon(_(":/debugger/images/breakpoint_disabled_16.png")),
@@ -148,7 +146,7 @@ bool BreakHandler::watchPointAt(quint64 address) const
 void BreakHandler::saveBreakpoints()
 {
     //qDebug() << "SAVING BREAKPOINTS...";
-    QTC_ASSERT(plugin(), return);
+    QTC_ASSERT(debuggerCore(), return);
     QList<QVariant> list;
     for (int index = 0; index != size(); ++index) {
         const BreakpointData *data = at(index);
@@ -178,15 +176,15 @@ void BreakHandler::saveBreakpoints()
             map.insert(_("usefullpath"), _("1"));
         list.append(map);
     }
-    plugin()->setSessionValue("Breakpoints", list);
+    debuggerCore()->setSessionValue("Breakpoints", list);
     //qDebug() << "SAVED BREAKPOINTS" << this << list.size();
 }
 
 void BreakHandler::loadBreakpoints()
 {
-    QTC_ASSERT(plugin(), return);
+    QTC_ASSERT(debuggerCore(), return);
     //qDebug() << "LOADING BREAKPOINTS...";
-    QVariant value = plugin()->sessionValue("Breakpoints");
+    QVariant value = debuggerCore()->sessionValue("Breakpoints");
     QList<QVariant> list = value.toList();
     clear();
     foreach (const QVariant &var, list) {
diff --git a/src/plugins/debugger/breakwindow.cpp b/src/plugins/debugger/breakwindow.cpp
index 14aa6588b8..ba3ecdddde 100644
--- a/src/plugins/debugger/breakwindow.cpp
+++ b/src/plugins/debugger/breakwindow.cpp
@@ -31,8 +31,7 @@
 #include "breakhandler.h"
 
 #include "debuggeractions.h"
-#include "debuggerplugin.h"
-#include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "ui_breakpoint.h"
 #include "ui_breakcondition.h"
 
@@ -44,26 +43,21 @@
 
 #include <QtGui/QAction>
 #include <QtGui/QHeaderView>
+#include <QtGui/QIntValidator>
+#include <QtGui/QItemSelectionModel>
 #include <QtGui/QKeyEvent>
 #include <QtGui/QMenu>
 #include <QtGui/QResizeEvent>
-#include <QtGui/QItemSelectionModel>
 #include <QtGui/QToolButton>
 #include <QtGui/QTreeView>
-#include <QtGui/QIntValidator>
 
 
 namespace Debugger {
 namespace Internal {
 
-static DebuggerPlugin *plugin()
-{
-    return DebuggerPlugin::instance();
-}
-
 static BreakHandler *breakHandler()
 {
-    return plugin()->breakHandler();
+    return debuggerCore()->breakHandler();
 }
 
 static BreakpointData *breakpointAt(int index)
@@ -323,7 +317,7 @@ void BreakWindow::contextMenuEvent(QContextMenuEvent *ev)
 
     QAction *synchronizeAction =
         new QAction(tr("Synchronize Breakpoints"), &menu);
-    synchronizeAction->setEnabled(plugin()->hasSnapshots());
+    synchronizeAction->setEnabled(debuggerCore()->hasSnapshots());
 
     QModelIndex idx0 = (si.size() ? si.front() : QModelIndex());
     QModelIndex idx2 = idx0.sibling(idx0.row(), 2);
@@ -556,7 +550,7 @@ void BreakWindow::rowActivated(const QModelIndex &index)
 {
     BreakpointData *data = breakpointAt(index.row());
     QTC_ASSERT(data, return);
-    plugin()->gotoLocation(data->markerFileName(),
+    debuggerCore()->gotoLocation(data->markerFileName(),
         data->markerLineNumber(), false);
 }
 
diff --git a/src/plugins/debugger/cdb/cdbstacktracecontext.cpp b/src/plugins/debugger/cdb/cdbstacktracecontext.cpp
index 3b0e7b6428..fb826f8897 100644
--- a/src/plugins/debugger/cdb/cdbstacktracecontext.cpp
+++ b/src/plugins/debugger/cdb/cdbstacktracecontext.cpp
@@ -33,7 +33,7 @@
 #include "cdbdumperhelper.h"
 #include "cdbengine_p.h"
 #include "debuggeractions.h"
-#include "debuggerplugin.h"
+#include "debuggercore.h"
 #include "watchutils.h"
 #include "threadshandler.h"
 
@@ -74,7 +74,8 @@ CdbStackTraceContext::createSymbolGroup(const CdbCore::ComInterfaces & /* cif */
     QStringList uninitializedVariables;
     const CdbCore::StackFrame &frame = stackFrameAt(index);
     if (theDebuggerAction(UseCodeModel)->isChecked())
-        getUninitializedVariables(DebuggerPlugin::instance()->cppCodeModelSnapshot(), frame.function, frame.fileName, frame.line, &uninitializedVariables);
+        getUninitializedVariables(debuggerCore()->cppCodeModelSnapshot(),
+            frame.function, frame.fileName, frame.line, &uninitializedVariables);
     if (debug)
         qDebug() << frame << uninitializedVariables;
     CdbSymbolGroupContext *sc = CdbSymbolGroupContext::create(prefix,
diff --git a/src/plugins/debugger/debugger.pro b/src/plugins/debugger/debugger.pro
index 3ab43200aa..213d18abe5 100644
--- a/src/plugins/debugger/debugger.pro
+++ b/src/plugins/debugger/debugger.pro
@@ -24,6 +24,7 @@ HEADERS += breakhandler.h \
     debugger_global.h \
     debuggeractions.h \
     debuggeragents.h \
+    debuggercore.h \
     debuggerconstants.h \
     debuggerdialogs.h \
     debuggerengine.h \
diff --git a/src/plugins/debugger/debuggeragents.cpp b/src/plugins/debugger/debuggeragents.cpp
index cae6f70ff5..bd5161afa6 100644
--- a/src/plugins/debugger/debuggeragents.cpp
+++ b/src/plugins/debugger/debuggeragents.cpp
@@ -30,10 +30,9 @@
 #include "debuggeragents.h"
 
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
+#include "debuggercore.h"
 #include "debuggerstringutils.h"
 #include "stackframe.h"
-#include "debuggerconstants.h"
 
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/editormanager/editormanager.h>
@@ -196,7 +195,7 @@ class LocationMark2 : public TextEditor::ITextMark
 public:
     LocationMark2() {}
 
-    QIcon icon() const { return DebuggerPlugin::instance()->locationMarkIcon(); }
+    QIcon icon() const { return debuggerCore()->locationMarkIcon(); }
     void updateLineNumber(int /*lineNumber*/) {}
     void updateBlock(const QTextBlock & /*block*/) {}
     void removedFromEditor() {}
diff --git a/src/plugins/debugger/debuggerengine.cpp b/src/plugins/debugger/debuggerengine.cpp
index 776896a1b8..926326dce2 100644
--- a/src/plugins/debugger/debuggerengine.cpp
+++ b/src/plugins/debugger/debuggerengine.cpp
@@ -31,8 +31,9 @@
 
 #include "debuggeractions.h"
 #include "debuggeragents.h"
-#include "debuggerrunner.h"
+#include "debuggercore.h"
 #include "debuggerplugin.h"
+#include "debuggerrunner.h"
 #include "debuggerstringutils.h"
 #include "debuggertooltip.h"
 
@@ -87,6 +88,8 @@ using namespace TextEditor;
 //
 ///////////////////////////////////////////////////////////////////////
 
+namespace Debugger {
+
 DebuggerStartParameters::DebuggerStartParameters() :
     isSnapshot(false),
     attachPID(-1),
@@ -106,9 +109,6 @@ void DebuggerStartParameters::clear()
     *this = DebuggerStartParameters();
 }
 
-
-namespace Debugger {
-
 QDebug operator<<(QDebug d, DebuggerState state)
 {
     //return d << DebuggerEngine::stateName(state) << '(' << int(state) << ')';
@@ -321,7 +321,7 @@ void DebuggerEngine::showModuleSymbols
         it->setData(2, Qt::DisplayRole, s.state);
         w->addTopLevelItem(it);
     }
-    plugin()->createNewDock(w);
+    debuggerCore()->createNewDock(w);
 }
 
 void DebuggerEngine::frameUp()
@@ -452,7 +452,7 @@ void DebuggerEngine::showMessage(const QString &msg, int channel, int timeout) c
 {
     //if (msg.size() && msg.at(0).isUpper() && msg.at(1).isUpper())
     //    qDebug() << qPrintable(msg) << "IN STATE" << state();
-    plugin()->showMessage(msg, channel, timeout);
+    debuggerCore()->showMessage(msg, channel, timeout);
     if (d->m_runControl) {
         d->m_runControl->showMessage(msg, channel);
     } else {
@@ -516,7 +516,7 @@ void DebuggerEngine::resetLocation()
 {
     d->m_disassemblerViewAgent.resetLocation();
     d->m_stackHandler.setCurrentIndex(-1);
-    plugin()->resetLocation();
+    debuggerCore()->resetLocation();
 }
 
 void DebuggerEngine::gotoLocation(const QString &fileName, int lineNumber, bool setMarker)
@@ -531,10 +531,10 @@ void DebuggerEngine::gotoLocation(const StackFrame &frame, bool setMarker)
 {
     if (theDebuggerBoolSetting(OperateByInstruction) || !frame.isUsable()) {
         if (setMarker)
-            plugin()->resetLocation();
+            debuggerCore()->resetLocation();
         d->m_disassemblerViewAgent.setFrame(frame);
     } else {
-        plugin()->gotoLocation(frame.file, frame.line, setMarker);
+        debuggerCore()->gotoLocation(frame.file, frame.line, setMarker);
     }
 }
 
@@ -600,7 +600,7 @@ QStringList DebuggerEngine::qtDumperLibraryLocations() const
 
 void DebuggerEngine::showQtDumperLibraryWarning(const QString &details)
 {
-    plugin()->showQtDumperLibraryWarning(details);
+    debuggerCore()->showQtDumperLibraryWarning(details);
 }
 
 QString DebuggerEngine::qtDumperLibraryName() const
@@ -1011,7 +1011,7 @@ void DebuggerEngine::updateViews()
     // should be coordinated by their master engine.
     if (isSlaveEngine())
         return;
-    plugin()->updateState(this);
+    debuggerCore()->updateState(this);
 }
 
 bool DebuggerEngine::isSlaveEngine() const
@@ -1074,14 +1074,9 @@ qint64 DebuggerEngine::inferiorPid() const
     return d->m_inferiorPid;
 }
 
-DebuggerPlugin *DebuggerEngine::plugin()
-{
-    return DebuggerPlugin::instance();
-}
-
 bool DebuggerEngine::isReverseDebugging() const
 {
-    return plugin()->isReverseDebugging();
+    return debuggerCore()->isReverseDebugging();
 }
 
 bool DebuggerEngine::isActive() const
@@ -1130,7 +1125,7 @@ void DebuggerEngine::progressPing()
 QMessageBox *DebuggerEngine::showMessageBox(int icon, const QString &title,
     const QString &text, int buttons)
 {
-    return plugin()->showMessageBox(icon, title, text, buttons);
+    return debuggerCore()->showMessageBox(icon, title, text, buttons);
 }
 
 DebuggerRunControl *DebuggerEngine::runControl() const
@@ -1394,7 +1389,7 @@ void DebuggerEngine::executeDebuggerCommand(const QString &)
 
 Internal::BreakHandler *DebuggerEngine::breakHandler() const
 {
-    return plugin()->breakHandler();
+    return debuggerCore()->breakHandler();
 }
 
 bool DebuggerEngine::isDying() const
diff --git a/src/plugins/debugger/debuggerengine.h b/src/plugins/debugger/debuggerengine.h
index a4d2ac5b1c..81c255caa3 100644
--- a/src/plugins/debugger/debuggerengine.h
+++ b/src/plugins/debugger/debuggerengine.h
@@ -56,8 +56,6 @@ class IOptionsPage;
 namespace Debugger {
 
 class DebuggerEnginePrivate;
-class DebuggerPlugin;
-class DebuggerPluginPrivate;
 class DebuggerRunControl;
 class QmlCppEngine;
 
@@ -118,6 +116,8 @@ DEBUGGER_EXPORT QDebug operator<<(QDebug str, DebuggerState state);
 
 namespace Internal {
 
+class DebuggerCore;
+class DebuggerPluginPrivate;
 class DisassemblerViewAgent;
 class MemoryViewAgent;
 class Symbol;
@@ -209,7 +209,7 @@ public:
         (int icon, const QString &title, const QString &text, int buttons = 0);
 
 protected:
-    friend class DebuggerPluginPrivate;
+    friend class Internal::DebuggerPluginPrivate;
     virtual void detachDebugger();
     virtual void exitDebugger();
     virtual void executeStep();
@@ -232,7 +232,6 @@ protected:
     virtual void frameDown();
 
 public:
-    static DebuggerPlugin *plugin();
     const DebuggerStartParameters &startParameters() const;
     DebuggerStartParameters &startParameters();
 
diff --git a/src/plugins/debugger/debuggerplugin.cpp b/src/plugins/debugger/debuggerplugin.cpp
index 7988270c40..2a314b12ea 100644
--- a/src/plugins/debugger/debuggerplugin.cpp
+++ b/src/plugins/debugger/debuggerplugin.cpp
@@ -32,6 +32,7 @@
 #include "debuggeractions.h"
 #include "debuggeragents.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerdialogs.h"
 #include "debuggerengine.h"
 #include "debuggermainwindow.h"
@@ -324,7 +325,6 @@ sg1: }
 
 using namespace Core;
 using namespace Debugger::Constants;
-using namespace Debugger::Internal;
 using namespace ProjectExplorer;
 using namespace TextEditor;
 
@@ -508,7 +508,7 @@ public:
         : BaseTextMark(fileName, linenumber)
     {}
 
-    QIcon icon() const { return DebuggerPlugin::instance()->locationMarkIcon(); }
+    QIcon icon() const { return debuggerCore()->locationMarkIcon(); }
     void updateLineNumber(int /*lineNumber*/) {}
     void updateBlock(const QTextBlock & /*block*/) {}
     void removedFromEditor() {}
@@ -854,9 +854,8 @@ struct DebuggerActions
     QAction *frameDownAction;
 };
 
-} // namespace Internal
+static DebuggerPluginPrivate *theDebuggerCore = 0;
 
-using namespace Debugger::Internal;
 
 ///////////////////////////////////////////////////////////////////////
 //
@@ -864,12 +863,13 @@ using namespace Debugger::Internal;
 //
 ///////////////////////////////////////////////////////////////////////
 
-class DebuggerPluginPrivate : public QObject
+class DebuggerPluginPrivate : public DebuggerCore
 {
     Q_OBJECT
 
 public:
     explicit DebuggerPluginPrivate(DebuggerPlugin *plugin);
+    ~DebuggerPluginPrivate();
 
     bool initialize(const QStringList &arguments, QString *errorMessage);
     void connectEngine(DebuggerEngine *engine, bool notify = true);
@@ -975,12 +975,35 @@ public slots:
     void showStatusMessage(const QString &msg, int timeout = -1);
     void openMemoryEditor();
 
-    DebuggerMainWindow *mainWindow()
-        { return qobject_cast<DebuggerMainWindow*>
-            (DebuggerUISwitcher::instance()->mainWindow()); }
+    void readSettings();
+    void writeSettings() const;
+
+    const CPlusPlus::Snapshot &cppCodeModelSnapshot() const;
+
+    void showQtDumperLibraryWarning(const QString &details);
+    DebuggerMainWindow *debuggerMainWindow() const;
+    QWidget *mainWindow() const { return m_uiSwitcher->mainWindow(); }
+
+    bool isRegisterViewVisible() const;
+    bool hasSnapshots() const { return m_snapshotHandler->size(); }
+    void createNewDock(QWidget *widget);
+
+    void runControlStarted(DebuggerRunControl *runControl);
+    void runControlFinished(DebuggerRunControl *runControl);
+    DebuggerLanguages activeLanguages() const;
+    void remoteCommand(const QStringList &options, const QStringList &);
+
+    bool isReverseDebugging() const;
+    QMessageBox *showMessageBox(int icon, const QString &title,
+        const QString &text, int buttons);
+    void ensureLogVisible();
+    void extensionsInitialized();
 
-    inline void setConfigValue(const QString &name, const QVariant &value);
-    inline QVariant configValue(const QString &name) const;
+    BreakHandler *breakHandler() const { return m_breakHandler; }
+    SnapshotHandler *snapshotHandler() const { return m_snapshotHandler; }
+
+    void setConfigValue(const QString &name, const QVariant &value);
+    QVariant configValue(const QString &name) const;
 
     DebuggerRunControl *createDebugger(const DebuggerStartParameters &sp,
         RunConfiguration *rc = 0);
@@ -1172,15 +1195,20 @@ public slots:
             currentEngine()->stackHandler()->currentFrame(), true);
     }
 
-    void resetLocation()
+    bool isActiveDebugLanguage(int lang) const
     {
-        // FIXME: code should be moved here.
-        currentEngine()->resetLocation();
-        //d->m_disassemblerViewAgent.resetLocation();
-        //d->m_stackHandler.setCurrentIndex(-1);
-        //plugin()->resetLocation();
+        return m_uiSwitcher->activeDebugLanguages() & lang;
     }
 
+    void resetLocation();
+    QVariant sessionValue(const QString &name);
+    void setSessionValue(const QString &name, const QVariant &value);
+    QIcon locationMarkIcon() const { return m_locationMarkIcon; }
+
+    void openTextEditor(const QString &titlePattern0, const QString &contents);
+    void clearCppCodeModelSnapshot();
+    void showMessage(const QString &msg, int channel, int timeout = -1);
+
 public:
     DebuggerState m_state;
     DebuggerUISwitcher *m_uiSwitcher;
@@ -1248,7 +1276,7 @@ public:
     QTimer m_statusTimer;
     QString m_lastPermanentStatusMessage;
 
-    CPlusPlus::Snapshot m_codeModelSnapshot;
+    mutable CPlusPlus::Snapshot m_codeModelSnapshot;
     DebuggerPlugin *m_plugin;
 
     SnapshotHandler *m_snapshotHandler;
@@ -1256,8 +1284,12 @@ public:
     DebuggerEngine *m_currentEngine;
 };
 
+
 DebuggerPluginPrivate::DebuggerPluginPrivate(DebuggerPlugin *plugin)
 {
+    QTC_ASSERT(!theDebuggerCore, /**/);
+    theDebuggerCore = this;
+
     m_plugin = plugin;
 
     m_shuttingDown = false;
@@ -1304,7 +1336,27 @@ DebuggerPluginPrivate::DebuggerPluginPrivate(DebuggerPlugin *plugin)
     m_currentEngine = 0;
 }
 
-bool DebuggerPluginPrivate::initialize(const QStringList &arguments, QString *errorMessage)
+DebuggerPluginPrivate::~DebuggerPluginPrivate()
+{
+    m_plugin->removeObject(theDebuggerCore->m_debugMode);
+    delete m_debugMode;
+    m_debugMode = 0;
+
+    m_plugin->removeObject(m_uiSwitcher);
+    delete m_uiSwitcher;
+    m_uiSwitcher = 0;
+
+    delete m_snapshotHandler;
+    m_snapshotHandler = 0;
+}
+
+DebuggerCore *debuggerCore()
+{
+    return theDebuggerCore;
+}
+
+bool DebuggerPluginPrivate::initialize(const QStringList &arguments,
+    QString *errorMessage)
 {
     m_continuableContext = Core::Context("Gdb.Continuable");
     m_interruptibleContext = Core::Context("Gdb.Interruptible");
@@ -1475,7 +1527,7 @@ bool DebuggerPluginPrivate::initialize(const QStringList &arguments, QString *er
     connect(theDebuggerAction(ExecuteCommand), SIGNAL(triggered()),
         SLOT(executeDebuggerCommand()));
 
-    m_plugin->readSettings();
+    readSettings();
 
     // Cpp/Qml ui setup
     m_uiSwitcher = new DebuggerUISwitcher(m_debugMode, this);
@@ -2307,6 +2359,7 @@ DebuggerRunControl *DebuggerPluginPrivate::createDebugger
     return m_debuggerRunControlFactory->create(sp, rc);
 }
 
+// If updateEngine is set, the engine will update its threads/modules and so forth.
 void DebuggerPluginPrivate::displayDebugger(DebuggerEngine *engine, bool updateEngine)
 {
     QTC_ASSERT(engine, return);
@@ -2344,7 +2397,7 @@ public:
 
 void DebuggerPluginPrivate::connectEngine(DebuggerEngine *engine, bool notify)
 {
-    static Debugger::DummyEngine dummyEngine;
+    static DummyEngine dummyEngine;
 
     if (!engine)
         engine = &dummyEngine;
@@ -2398,7 +2451,6 @@ void DebuggerPluginPrivate::fontSettingsChanged
 
 void DebuggerPluginPrivate::cleanupViews()
 {
-    m_plugin->resetLocation();
     m_actions.reverseDirectionAction->setChecked(false);
     m_actions.reverseDirectionAction->setEnabled(false);
     hideDebuggerToolTip();
@@ -2451,8 +2503,8 @@ void DebuggerPluginPrivate::setBusyCursor(bool busy)
 void DebuggerPluginPrivate::setSimpleDockWidgetArrangement
     (Debugger::DebuggerLanguages activeLanguages)
 {
-    Debugger::DebuggerUISwitcher *uiSwitcher = DebuggerUISwitcher::instance();
-    DebuggerMainWindow *mw = mainWindow();
+    DebuggerMainWindow *mw = debuggerMainWindow();
+    QTC_ASSERT(mw, return);
     mw->setTrackingEnabled(false);
 
     QList<QDockWidget *> dockWidgets = mw->dockWidgets();
@@ -2483,8 +2535,8 @@ void DebuggerPluginPrivate::setSimpleDockWidgetArrangement
         m_breakDock->show();
         m_watchDock->show();
         m_scriptConsoleDock->show();
-        if (uiSwitcher->qmlInspectorWindow())
-            uiSwitcher->qmlInspectorWindow()->show();
+        if (m_uiSwitcher->qmlInspectorWindow())
+            m_uiSwitcher->qmlInspectorWindow()->show();
     }
     mw->splitDockWidget(mw->toolBarDockWidget(), m_stackDock, Qt::Vertical);
     mw->splitDockWidget(m_stackDock, m_watchDock, Qt::Horizontal);
@@ -2495,8 +2547,8 @@ void DebuggerPluginPrivate::setSimpleDockWidgetArrangement
     mw->tabifyDockWidget(m_watchDock, m_sourceFilesDock);
     mw->tabifyDockWidget(m_watchDock, m_snapshotDock);
     mw->tabifyDockWidget(m_watchDock, m_scriptConsoleDock);
-    if (uiSwitcher->qmlInspectorWindow())
-        mw->tabifyDockWidget(m_watchDock, uiSwitcher->qmlInspectorWindow());
+    if (m_uiSwitcher->qmlInspectorWindow())
+        mw->tabifyDockWidget(m_watchDock, m_uiSwitcher->qmlInspectorWindow());
 
     mw->setTrackingEnabled(true);
 }
@@ -2800,7 +2852,7 @@ void DebuggerPluginPrivate::executeDebuggerCommand()
 
 void DebuggerPluginPrivate::showStatusMessage(const QString &msg0, int timeout)
 {
-    m_plugin->showMessage(msg0, LogStatus);
+    showMessage(msg0, LogStatus);
     QString msg = msg0;
     msg.replace(QLatin1Char('\n'), QString());
     m_statusLabel->setText(msg);
@@ -2830,90 +2882,58 @@ void DebuggerPluginPrivate::coreShutdown()
     m_shuttingDown = true;
 }
 
-///////////////////////////////////////////////////////////////////////
-//
-// DebuggerPlugin
-//
-///////////////////////////////////////////////////////////////////////
-
-DebuggerPlugin *theInstance = 0;
-
-DebuggerPlugin *DebuggerPlugin::instance()
+void DebuggerPluginPrivate::writeSettings() const
 {
-    return theInstance;
+    QSettings *s = settings();
+    DebuggerSettings::instance()->writeSettings(s);
+    if (m_uiSwitcher)
+        m_uiSwitcher->writeSettings(s);
 }
 
-DebuggerPlugin::DebuggerPlugin()
+void DebuggerPluginPrivate::readSettings()
 {
-    d = new DebuggerPluginPrivate(this);
-    theInstance = this;
+    //qDebug() << "PLUGIN READ SETTINGS";
+    QSettings *s = settings();
+    DebuggerSettings::instance()->readSettings(s);
+    if (m_uiSwitcher)
+        m_uiSwitcher->writeSettings(s);
 }
 
-DebuggerPlugin::~DebuggerPlugin()
+const CPlusPlus::Snapshot &DebuggerPluginPrivate::cppCodeModelSnapshot() const
 {
-    theInstance = 0;
-    delete DebuggerSettings::instance();
-
-    removeObject(d->m_debugMode);
-
-    delete d->m_debugMode;
-    d->m_debugMode = 0;
-
-    removeObject(d->m_uiSwitcher);
-    delete d->m_uiSwitcher;
-    d->m_uiSwitcher = 0;
-
-    delete d->m_snapshotHandler;
-    d->m_snapshotHandler = 0;
-
-    delete d;
+    if (m_codeModelSnapshot.isEmpty()
+            && theDebuggerAction(UseCodeModel)->isChecked())
+        m_codeModelSnapshot = CppTools::CppModelManagerInterface::instance()->snapshot();
+    return m_codeModelSnapshot;
 }
 
-bool DebuggerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void DebuggerPluginPrivate::resetLocation()
 {
-    return d->initialize(arguments, errorMessage);
+    currentEngine()->resetLocation();
+    // FIXME: code should be moved here from the engine implementation.
+    //d->m_disassemblerViewAgent.resetLocation();
+    //d->m_stackHandler.setCurrentIndex(-1);
+    m_locationMark.reset();
 }
 
-void DebuggerPlugin::setSessionValue(const QString &name, const QVariant &value)
+void DebuggerPluginPrivate::setSessionValue(const QString &name, const QVariant &value)
 {
     QTC_ASSERT(sessionManager(), return);
     sessionManager()->setValue(name, value);
     //qDebug() << "SET SESSION VALUE: " << name;
 }
 
-QVariant DebuggerPlugin::sessionValue(const QString &name)
+QVariant DebuggerPluginPrivate::sessionValue(const QString &name)
 {
     QTC_ASSERT(sessionManager(), return QVariant());
     //qDebug() << "GET SESSION VALUE: " << name;
     return sessionManager()->value(name);
 }
 
-void DebuggerPlugin::setConfigValue(const QString &name, const QVariant &value)
-{
-    QTC_ASSERT(d->m_debugMode, return);
-    settings()->setValue(name, value);
-}
-
-QVariant DebuggerPlugin::configValue(const QString &name) const
-{
-    QTC_ASSERT(d->m_debugMode, return QVariant());
-    return settings()->value(name);
-}
-
-void DebuggerPlugin::resetLocation()
-{
-    d->m_locationMark.reset();
-}
-
-void DebuggerPlugin::gotoLocation(const QString &file, int line, bool setMarker)
-{
-    d->gotoLocation(file, line, setMarker);
-}
-
-void DebuggerPlugin::openTextEditor(const QString &titlePattern0,
+void DebuggerPluginPrivate::openTextEditor(const QString &titlePattern0,
     const QString &contents)
 {
-    if (d->m_shuttingDown)
+    if (m_shuttingDown)
         return;
     QString titlePattern = titlePattern0;
     EditorManager *editorManager = EditorManager::instance();
@@ -2924,84 +2944,150 @@ void DebuggerPlugin::openTextEditor(const QString &titlePattern0,
     editorManager->activateEditor(editor, EditorManager::IgnoreNavigationHistory);
 }
 
-void DebuggerPlugin::writeSettings() const
-{
-    QSettings *s = settings();
-    DebuggerSettings::instance()->writeSettings(s);
-}
-
-void DebuggerPlugin::readSettings()
-{
-    //qDebug() << "PLUGIN READ SETTINGS";
-    QSettings *s = settings();
-    DebuggerSettings::instance()->readSettings(s);
-}
-
-const CPlusPlus::Snapshot &DebuggerPlugin::cppCodeModelSnapshot() const
-{
-    if (d->m_codeModelSnapshot.isEmpty() && theDebuggerAction(UseCodeModel)->isChecked())
-        d->m_codeModelSnapshot = CppTools::CppModelManagerInterface::instance()->snapshot();
-    return d->m_codeModelSnapshot;
-}
-
-void DebuggerPlugin::clearCppCodeModelSnapshot()
-{
-    d->m_codeModelSnapshot = CPlusPlus::Snapshot();
-}
 
-ExtensionSystem::IPlugin::ShutdownFlag DebuggerPlugin::aboutToShutdown()
+void DebuggerPluginPrivate::clearCppCodeModelSnapshot()
 {
-    disconnect(sessionManager(),
-        SIGNAL(startupProjectChanged(ProjectExplorer::Project*)), d, 0);
-    writeSettings();
-    if (d->m_uiSwitcher)
-        d->m_uiSwitcher->aboutToShutdown();
-    return SynchronousShutdown;
+    m_codeModelSnapshot = CPlusPlus::Snapshot();
 }
 
-void DebuggerPlugin::showMessage(const QString &msg, int channel, int timeout)
+void DebuggerPluginPrivate::showMessage(const QString &msg, int channel, int timeout)
 {
     //qDebug() << "PLUGIN OUTPUT: " << channel << msg;
-    LogWindow *ow = d->m_logWindow;
-    //ConsoleWindow *cw = d->m_consoleWindow;
-    QTC_ASSERT(ow, return);
+    //ConsoleWindow *cw = m_consoleWindow;
+    QTC_ASSERT(m_logWindow, return);
     switch (channel) {
         case StatusBar:
-            // This will append to ow's output pane, too.
-            d->showStatusMessage(msg, timeout);
+            // This will append to m_logWindow's output pane, too.
+            showStatusMessage(msg, timeout);
             break;
         case LogMiscInput:
-            ow->showInput(LogMisc, msg);
-            ow->showOutput(LogMisc, msg);
+            m_logWindow->showInput(LogMisc, msg);
+            m_logWindow->showOutput(LogMisc, msg);
             break;
         case LogInput:
-            ow->showInput(LogInput, msg);
-            ow->showOutput(LogInput, msg);
+            m_logWindow->showInput(LogInput, msg);
+            m_logWindow->showOutput(LogInput, msg);
             break;
         case ScriptConsoleOutput:
-            d->m_scriptConsoleWindow->appendResult(msg);
+            m_scriptConsoleWindow->appendResult(msg);
+            break;
+        case LogError:
+            m_logWindow->showOutput(channel, msg);
+            ensureLogVisible();
             break;
         default:
-            ow->showOutput(channel, msg);
-            if (channel == LogError)
-                ensureLogVisible();
+            m_logWindow->showOutput(channel, msg);
             break;
     }
 }
 
+DebuggerMainWindow *DebuggerPluginPrivate::debuggerMainWindow() const
+{
+    return qobject_cast<DebuggerMainWindow*>(mainWindow());
+}
 
-//////////////////////////////////////////////////////////////////////
-//
-// Register specific stuff
-//
-//////////////////////////////////////////////////////////////////////
+void DebuggerPluginPrivate::showQtDumperLibraryWarning(const QString &details)
+{
+    QMessageBox dialog(mainWindow());
+    QPushButton *qtPref = dialog.addButton(tr("Open Qt4 Options"),
+        QMessageBox::ActionRole);
+    QPushButton *helperOff = dialog.addButton(tr("Turn off Helper Usage"),
+        QMessageBox::ActionRole);
+    QPushButton *justContinue = dialog.addButton(tr("Continue Anyway"),
+        QMessageBox::AcceptRole);
+    dialog.setDefaultButton(justContinue);
+    dialog.setWindowTitle(tr("Debugging Helper Missing"));
+    dialog.setText(tr("The debugger could not load the debugging helper library."));
+    dialog.setInformativeText(tr(
+        "The debugging helper is used to nicely format the values of some Qt "
+        "and Standard Library data types. "
+        "It must be compiled for each used Qt version separately. "
+        "On the Qt4 options page, select a Qt installation "
+        "and click Rebuild."));
+    if (!details.isEmpty())
+        dialog.setDetailedText(details);
+    dialog.exec();
+    if (dialog.clickedButton() == qtPref) {
+        Core::ICore::instance()->showOptionsDialog(
+            _(Qt4ProjectManager::Constants::QT_SETTINGS_CATEGORY),
+            _(Qt4ProjectManager::Constants::QTVERSION_SETTINGS_PAGE_ID));
+    } else if (dialog.clickedButton() == helperOff) {
+        theDebuggerAction(UseDebuggingHelpers)
+            ->setValue(qVariantFromValue(false), false);
+    }
+}
+
+bool DebuggerPluginPrivate::isRegisterViewVisible() const
+{
+    return m_registerDock->toggleViewAction()->isChecked();
+}
+
+void DebuggerPluginPrivate::createNewDock(QWidget *widget)
+{
+    QDockWidget *dockWidget =
+        m_uiSwitcher->createDockWidget(CppLanguage, widget);
+    dockWidget->setWindowTitle(widget->windowTitle());
+    dockWidget->setObjectName(widget->windowTitle());
+    dockWidget->setFeatures(QDockWidget::DockWidgetClosable);
+    //dockWidget->setWidget(widget);
+    //mainWindow()->addDockWidget(Qt::TopDockWidgetArea, dockWidget);
+    dockWidget->show();
+}
+
+void DebuggerPluginPrivate::runControlStarted(DebuggerRunControl *runControl)
+{
+    activateDebugMode();
+    if (!hasSnapshots())
+        m_uiSwitcher->updateActiveLanguages();
+
+    const QString message = runControl->idString();
+    showMessage(message, StatusBar);
+    showMessage(DebuggerSettings::instance()->dump(), LogDebug);
+    m_snapshotHandler->appendSnapshot(runControl);
+    connectEngine(runControl->engine());
+}
+
+void DebuggerPluginPrivate::runControlFinished(DebuggerRunControl *runControl)
+{
+    m_snapshotHandler->removeSnapshot(runControl);
+    disconnectEngine();
+    if (theDebuggerBoolSetting(SwitchModeOnExit))
+        if (m_snapshotHandler->size() == 0)
+            activatePreviousMode();
+}
+
+void DebuggerPluginPrivate::remoteCommand(const QStringList &options,
+    const QStringList &)
+{
+    if (options.isEmpty())
+        return;
+
+    unsigned enabledEngines = 0;
+    QString errorMessage;
+
+    if (!parseArguments(options,
+            &m_attachRemoteParameters, &enabledEngines, &errorMessage)) {
+        qWarning("%s", qPrintable(errorMessage));
+        return;
+    }
+
+    if (!attachCmdLine())
+        qWarning("%s", qPrintable(
+            _("Incomplete remote attach command received: %1").
+               arg(options.join(QString(QLatin1Char(' '))))));
+}
 
-bool DebuggerPlugin::isReverseDebugging() const
+DebuggerLanguages DebuggerPluginPrivate::activeLanguages() const
 {
-    return d->m_actions.reverseDirectionAction->isChecked();
+    return m_uiSwitcher->activeDebugLanguages();
 }
 
-QMessageBox *DebuggerPlugin::showMessageBox(int icon, const QString &title,
+bool DebuggerPluginPrivate::isReverseDebugging() const
+{
+    return m_actions.reverseDirectionAction->isChecked();
+}
+
+QMessageBox *DebuggerPluginPrivate::showMessageBox(int icon, const QString &title,
     const QString &text, int buttons)
 {
     QMessageBox *mb = new QMessageBox(QMessageBox::Icon(icon),
@@ -3011,182 +3097,125 @@ QMessageBox *DebuggerPlugin::showMessageBox(int icon, const QString &title,
     return mb;
 }
 
-void DebuggerPlugin::ensureLogVisible()
+void DebuggerPluginPrivate::ensureLogVisible()
 {
-    QAction *action = d->m_outputDock->toggleViewAction();
+    QAction *action = m_outputDock->toggleViewAction();
     if (!action->isChecked())
         action->trigger();
 }
 
-QIcon DebuggerPlugin::locationMarkIcon() const
-{
-    return d->m_locationMarkIcon;
-}
-
-void DebuggerPlugin::extensionsInitialized()
+void DebuggerPluginPrivate::extensionsInitialized()
 {
-    d->m_uiSwitcher->initialize();
-    d->m_watchersWindow->setVisible(false);
-    d->m_returnWindow->setVisible(false);
-    connect(d->m_uiSwitcher, SIGNAL(memoryEditorRequested()),
-        d, SLOT(openMemoryEditor()));
+    m_uiSwitcher->initialize(settings());
+    m_watchersWindow->setVisible(false);
+    m_returnWindow->setVisible(false);
+    connect(m_uiSwitcher, SIGNAL(memoryEditorRequested()),
+        SLOT(openMemoryEditor()));
 
     // time gdb -i mi -ex 'debuggerplugin.cpp:800' -ex r -ex q bin/qtcreator.bin
     const QByteArray env = qgetenv("QTC_DEBUGGER_TEST");
     //qDebug() << "EXTENSIONS INITIALIZED:" << env;
     // if (!env.isEmpty())
     //    m_plugin->runTest(QString::fromLocal8Bit(env));
-    if (d->m_attachRemoteParameters.attachPid
-            || !d->m_attachRemoteParameters.attachTarget.isEmpty())
-        QTimer::singleShot(0, d, SLOT(attachCmdLine()));
+    if (m_attachRemoteParameters.attachPid
+            || !m_attachRemoteParameters.attachTarget.isEmpty())
+        QTimer::singleShot(0, this, SLOT(attachCmdLine()));
 }
 
-QWidget *DebuggerPlugin::mainWindow() const
-{
-    return d->m_uiSwitcher->mainWindow();
-}
+} // namespace Internal
 
-DebuggerRunControl *DebuggerPlugin::createDebugger
-    (const DebuggerStartParameters &sp, RunConfiguration *rc)
-{
-    return instance()->d->createDebugger(sp, rc);
-}
+using namespace Debugger::Internal;
 
-void DebuggerPlugin::startDebugger(RunControl *runControl)
-{
-    instance()->d->startDebugger(runControl);
-}
+///////////////////////////////////////////////////////////////////////
+//
+// DebuggerPlugin
+//
+///////////////////////////////////////////////////////////////////////
 
-void DebuggerPlugin::displayDebugger(RunControl *runControl)
+DebuggerPlugin::DebuggerPlugin()
 {
-    DebuggerRunControl *rc = qobject_cast<DebuggerRunControl *>(runControl);
-    QTC_ASSERT(rc, return);
-    instance()->d->displayDebugger(rc->engine());
+    theDebuggerCore = new DebuggerPluginPrivate(this);
 }
 
-// if updateEngine is set, the engine will update its threads/modules and so forth.
-void DebuggerPlugin::displayDebugger(DebuggerEngine *engine, bool updateEngine)
+DebuggerPlugin::~DebuggerPlugin()
 {
-    instance()->d->displayDebugger(engine, updateEngine);
+    delete DebuggerSettings::instance();
+    delete theDebuggerCore;
+    theDebuggerCore = 0;
 }
 
-void DebuggerPlugin::updateState(DebuggerEngine *engine)
+bool DebuggerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
 {
-    d->updateState(engine);
+    return theDebuggerCore->initialize(arguments, errorMessage);
 }
 
-void DebuggerPlugin::activateDebugMode()
+void DebuggerPlugin::readSettings()
 {
-    d->activateDebugMode();
+    theDebuggerCore->readSettings();
 }
 
-void DebuggerPlugin::createNewDock(QWidget *widget)
+void DebuggerPlugin::writeSettings() const
 {
-    QDockWidget *dockWidget =
-        DebuggerUISwitcher::instance()->createDockWidget(CppLanguage, widget);
-    dockWidget->setWindowTitle(widget->windowTitle());
-    dockWidget->setObjectName(widget->windowTitle());
-    dockWidget->setFeatures(QDockWidget::DockWidgetClosable);
-    //dockWidget->setWidget(widget);
-    //mainWindow()->addDockWidget(Qt::TopDockWidgetArea, dockWidget);
-    dockWidget->show();
+    theDebuggerCore->writeSettings();
 }
 
-void DebuggerPlugin::runControlStarted(DebuggerRunControl *runControl)
+ExtensionSystem::IPlugin::ShutdownFlag DebuggerPlugin::aboutToShutdown()
 {
-    d->connectEngine(runControl->engine());
-    d->m_snapshotHandler->appendSnapshot(runControl);
+    disconnect(sessionManager(),
+        SIGNAL(startupProjectChanged(ProjectExplorer::Project*)),
+        theDebuggerCore, 0);
+    writeSettings();
+    return SynchronousShutdown;
 }
 
-void DebuggerPlugin::runControlFinished(DebuggerRunControl *runControl)
+void DebuggerPlugin::remoteCommand(const QStringList &options,
+    const QStringList &list)
 {
-    Q_UNUSED(runControl);
-    d->m_snapshotHandler->removeSnapshot(runControl);
-    d->disconnectEngine();
-    if (theDebuggerBoolSetting(SwitchModeOnExit))
-        if (d->m_snapshotHandler->size() == 0)
-            d->activatePreviousMode();
+    theDebuggerCore->remoteCommand(options, list);
 }
 
-DebuggerLanguages DebuggerPlugin::activeLanguages() const
+
+DebuggerRunControl *DebuggerPlugin::createDebugger
+    (const DebuggerStartParameters &sp, RunConfiguration *rc)
 {
-    return DebuggerUISwitcher::instance()->activeDebugLanguages();
+    return theDebuggerCore->createDebugger(sp, rc);
 }
 
-bool DebuggerPlugin::isRegisterViewVisible() const
+void DebuggerPlugin::startDebugger(RunControl *runControl)
 {
-    return d->m_registerDock->toggleViewAction()->isChecked();
+    theDebuggerCore->startDebugger(runControl);
 }
 
-bool DebuggerPlugin::hasSnapshots() const
+void DebuggerPlugin::displayDebugger(RunControl *runControl)
 {
-    return d->m_snapshotHandler->size();
+    DebuggerRunControl *rc = qobject_cast<DebuggerRunControl *>(runControl);
+    QTC_ASSERT(rc, return);
+    theDebuggerCore->displayDebugger(rc->engine());
 }
 
-Internal::BreakHandler *DebuggerPlugin::breakHandler() const
+void DebuggerPlugin::runControlStarted(DebuggerRunControl *runControl)
 {
-    return d->m_breakHandler;
+    theDebuggerCore->runControlStarted(runControl);
 }
 
-Internal::SnapshotHandler *DebuggerPlugin::snapshotHandler() const
+void DebuggerPlugin::runControlFinished(DebuggerRunControl *runControl)
 {
-    return d->m_snapshotHandler;
+    theDebuggerCore->runControlFinished(runControl);
 }
 
-DebuggerEngine *DebuggerPlugin::currentEngine() const
+void DebuggerPlugin::extensionsInitialized()
 {
-    return d->m_currentEngine;
+    theDebuggerCore->extensionsInitialized();
 }
 
-void DebuggerPlugin::remoteCommand(const QStringList &options, const QStringList &)
+bool DebuggerPlugin::isActiveDebugLanguage(int language)
 {
-    if (options.isEmpty())
-        return;
-
-    unsigned enabledEngines = 0;
-    QString errorMessage;
-
-    if (!parseArguments(options,
-            &d->m_attachRemoteParameters, &enabledEngines, &errorMessage)) {
-        qWarning("%s", qPrintable(errorMessage));
-        return;
-    }
-
-    if (!d->attachCmdLine())
-        qWarning("%s", qPrintable(
-            _("Incomplete remote attach command received: %1").
-               arg(options.join(QString(QLatin1Char(' '))))));
+    return theDebuggerCore->isActiveDebugLanguage(language);
 }
 
-void DebuggerPlugin::showQtDumperLibraryWarning(const QString &details)
+DebuggerUISwitcher *DebuggerPlugin::uiSwitcher()
 {
-    QMessageBox dialog(mainWindow());
-    QPushButton *qtPref = dialog.addButton(tr("Open Qt4 Options"),
-        QMessageBox::ActionRole);
-    QPushButton *helperOff = dialog.addButton(tr("Turn off Helper Usage"),
-        QMessageBox::ActionRole);
-    QPushButton *justContinue = dialog.addButton(tr("Continue Anyway"),
-        QMessageBox::AcceptRole);
-    dialog.setDefaultButton(justContinue);
-    dialog.setWindowTitle(tr("Debugging Helper Missing"));
-    dialog.setText(tr("The debugger could not load the debugging helper library."));
-    dialog.setInformativeText(tr(
-        "The debugging helper is used to nicely format the values of some Qt "
-        "and Standard Library data types. "
-        "It must be compiled for each used Qt version separately. "
-        "On the Qt4 options page, select a Qt installation "
-        "and click Rebuild."));
-    if (!details.isEmpty())
-        dialog.setDetailedText(details);
-    dialog.exec();
-    if (dialog.clickedButton() == qtPref) {
-        Core::ICore::instance()->showOptionsDialog(
-            _(Qt4ProjectManager::Constants::QT_SETTINGS_CATEGORY),
-            _(Qt4ProjectManager::Constants::QTVERSION_SETTINGS_PAGE_ID));
-    } else if (dialog.clickedButton() == helperOff) {
-        theDebuggerAction(UseDebuggingHelpers)
-            ->setValue(qVariantFromValue(false), false);
-    }
+    return theDebuggerCore->m_uiSwitcher;
 }
 
 //////////////////////////////////////////////////////////////////////
diff --git a/src/plugins/debugger/debuggerplugin.h b/src/plugins/debugger/debuggerplugin.h
index 200259bbf3..6b0175a6e5 100644
--- a/src/plugins/debugger/debuggerplugin.h
+++ b/src/plugins/debugger/debuggerplugin.h
@@ -31,18 +31,10 @@
 #define DEBUGGERPLUGIN_H
 
 #include "debugger_global.h"
-#include "debuggerconstants.h"
 
 #include <extensionsystem/iplugin.h>
 
-QT_BEGIN_NAMESPACE
-class QIcon;
-class QMessageBox;
-QT_END_NAMESPACE
-
-namespace CPlusPlus {
-class Snapshot;
-}
+#include <QtCore/QObject>
 
 namespace ProjectExplorer {
 class RunConfiguration;
@@ -50,15 +42,15 @@ class RunControl;
 }
 
 namespace Debugger {
-class DebuggerEngine;
-class DebuggerPluginPrivate;
+
 class DebuggerRunControl;
 class DebuggerStartParameters;
+class DebuggerUISwitcher;
 
-namespace Internal {
-class BreakHandler;
-class SnapshotHandler;
-}
+// This is the "external" interface of the debugger plugin that's
+// visible from Creator core. The internal interfact to global
+// functionality to be used by debugger views and debugger engines
+// is DebuggerCore, implemented in DebuggerPluginPrivate.
 
 class DEBUGGER_EXPORT DebuggerPlugin : public ExtensionSystem::IPlugin
 {
@@ -68,68 +60,23 @@ public:
     DebuggerPlugin();
     ~DebuggerPlugin();
 
-    static DebuggerPlugin *instance();
-
     static DebuggerRunControl *createDebugger(const DebuggerStartParameters &sp,
         ProjectExplorer::RunConfiguration *rc = 0);
     static void startDebugger(ProjectExplorer::RunControl *runControl);
     static void displayDebugger(ProjectExplorer::RunControl *runControl);
-    static void displayDebugger(DebuggerEngine *engine, bool updateEngine = true);
-
-    QVariant sessionValue(const QString &name);
-    void setSessionValue(const QString &name, const QVariant &value);
-    QVariant configValue(const QString &name) const;
-    void setConfigValue(const QString &name, const QVariant &value);
-    void updateState(DebuggerEngine *engine);
-    virtual void remoteCommand(const QStringList &options, const QStringList &arguments);
-    void showQtDumperLibraryWarning(const QString &details);
-
-    QIcon locationMarkIcon() const;
-    void activateDebugMode();
-
-    const CPlusPlus::Snapshot &cppCodeModelSnapshot() const;
-    bool isRegisterViewVisible() const;
-    bool hasSnapshots() const;
-
-    void openTextEditor(const QString &titlePattern, const QString &contents);
-    Internal::BreakHandler *breakHandler() const;
-    Internal::SnapshotHandler *snapshotHandler() const;
-    DebuggerEngine *currentEngine() const;
-
-public slots:
-    void clearCppCodeModelSnapshot();
-    void ensureLogVisible();
-
-    // void runTest(const QString &fileName);
-    void showMessage(const QString &msg, int channel, int timeout = -1);
-    void gotoLocation(const QString &fileName, int lineNumber = -1,
-        bool setMarker = false);
+    static bool isActiveDebugLanguage(int language);
+    static DebuggerUISwitcher *uiSwitcher();
 
 private:
-    friend class DebuggerEngine;
-    friend class DebuggerPluginPrivate;
-    friend class DebuggerRunControl;
-
-    void resetLocation();
+    // IPlugin implementation.
+    bool initialize(const QStringList &arguments, QString *errorMessage);
+    void remoteCommand(const QStringList &options, const QStringList &arguments);
+    ShutdownFlag aboutToShutdown();
+    void extensionsInitialized();
     void readSettings();
     void writeSettings() const;
-
-    bool isReverseDebugging() const;
-    void createNewDock(QWidget *widget);
     void runControlStarted(DebuggerRunControl *runControl);
     void runControlFinished(DebuggerRunControl *runControl);
-    DebuggerLanguages activeLanguages() const;
-
-    QMessageBox *showMessageBox(int icon, const QString &title,
-        const QString &text, int buttons = 0);
-
-    bool initialize(const QStringList &arguments, QString *errorMessage);
-    ShutdownFlag aboutToShutdown();
-    void extensionsInitialized();
-
-    QWidget *mainWindow() const;
-
-    DebuggerPluginPrivate *d;
 };
 
 } // namespace Debugger
diff --git a/src/plugins/debugger/debuggerrunner.cpp b/src/plugins/debugger/debuggerrunner.cpp
index aa095193cd..7077286c49 100644
--- a/src/plugins/debugger/debuggerrunner.cpp
+++ b/src/plugins/debugger/debuggerrunner.cpp
@@ -30,6 +30,7 @@
 #include "debuggerrunner.h"
 
 #include "debuggeractions.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
 #include "debuggerplugin.h"
 #include "debuggerstringutils.h"
@@ -112,8 +113,6 @@ static QString msgEngineNotAvailable(const char *engine)
         "which is disabled.").arg(QLatin1String(engine));
 }
 
-static DebuggerPlugin *plugin() { return DebuggerPlugin::instance(); }
-
 // A factory to create DebuggerRunControls
 DebuggerRunControlFactory::DebuggerRunControlFactory(QObject *parent,
         unsigned enabledEngines)
@@ -180,16 +179,17 @@ static DebuggerStartParameters localStartParameters(RunConfiguration *runConfigu
     sp.dumperLibrary = rc->dumperLibrary();
     sp.dumperLibraryLocations = rc->dumperLibraryLocations();
 
-    DebuggerLanguages activeLangs = DebuggerUISwitcher::instance()->activeDebugLanguages();
-    if (activeLangs & QmlLanguage) {
+    if (debuggerCore()->isActiveDebugLanguage(QmlLanguage)) {
         sp.qmlServerAddress = QLatin1String("127.0.0.1");
         sp.qmlServerPort = runConfiguration->qmlDebugServerPort();
 
         sp.projectDir = runConfiguration->target()->project()->projectDirectory();
         if (runConfiguration->target()->activeBuildConfiguration())
-            sp.projectBuildDir = runConfiguration->target()->activeBuildConfiguration()->buildDirectory();
+            sp.projectBuildDir = runConfiguration->target()
+                ->activeBuildConfiguration()->buildDirectory();
 
-        sp.processArgs.append(QLatin1String("-qmljsdebugger=port:") + QString::number(sp.qmlServerPort));
+        sp.processArgs.append(QLatin1String("-qmljsdebugger=port:")
+            + QString::number(sp.qmlServerPort));
     }
 
     // FIXME: If it's not yet build this will be empty and not filled
@@ -413,7 +413,7 @@ void DebuggerRunControl::createEngine(const DebuggerStartParameters &startParams
 
     // Figure out engine according to toolchain, executable, attach or default.
     DebuggerEngineType engineType = NoEngineType;
-    DebuggerLanguages activeLangs = DebuggerPlugin::instance()->activeLanguages();
+    DebuggerLanguages activeLangs = debuggerCore()->activeLanguages();
     const unsigned enabledEngineTypes = d->enabledEngines();
     if (sp.executable.endsWith(_(".js")))
         engineType = ScriptEngineType;
@@ -540,7 +540,7 @@ bool DebuggerRunControl::checkDebugConfiguration(int toolChain,
 
     bool success = true;
 
-    if (!(DebuggerPlugin::instance()->activeLanguages() & CppLanguage))
+    if (!(debuggerCore()->activeLanguages() & CppLanguage))
         return success;
 
     switch(toolChain) {
@@ -589,14 +589,7 @@ void DebuggerRunControl::start()
         return;
     }
 
-    plugin()->activateDebugMode();
-    DebuggerUISwitcher::instance()->aboutToStartDebugger();
-
-    const QString message = tr("Starting debugger '%1' for tool chain '%2'...").
-                  arg(d->m_engine->objectName(), toolChainName(sp.toolChainType));
-    plugin()->showMessage(message, StatusBar);
-    plugin()->showMessage(DebuggerSettings::instance()->dump(), LogDebug);
-    plugin()->runControlStarted(this);
+    debuggerCore()->runControlStarted(this);
 
     // We might get a synchronous startFailed() notification on Windows,
     // when launching the process fails. Emit a proper finished() sequence.
@@ -611,6 +604,13 @@ void DebuggerRunControl::start()
     }
 }
 
+QString DebuggerRunControl::idString() const
+{
+    return tr("Starting debugger '%1' for tool chain '%2'...")
+        .arg(d->m_engine->objectName())
+        .arg(toolChainName(d->m_engine->startParameters().toolChainType));
+}
+
 void DebuggerRunControl::startFailed()
 {
     emit addToOutputWindowInline(this, tr("Debugging has failed"), false);
@@ -624,7 +624,7 @@ void DebuggerRunControl::handleFinished()
     emit addToOutputWindowInline(this, tr("Debugging has finished"), false);
     if (engine())
         engine()->handleFinished();
-    plugin()->runControlFinished(this);
+    debuggerCore()->runControlFinished(this);
 }
 
 void DebuggerRunControl::showMessage(const QString &msg, int channel)
@@ -652,7 +652,7 @@ bool DebuggerRunControl::aboutToStop() const
             " Would you still like to terminate it?");
 
     const QMessageBox::StandardButton answer =
-            QMessageBox::question(DebuggerUISwitcher::instance()->mainWindow(),
+            QMessageBox::question(debuggerCore()->mainWindow(),
                                   tr("Close Debugging Session"), question,
                                   QMessageBox::Yes|QMessageBox::No);
     return answer == QMessageBox::Yes;
@@ -754,4 +754,5 @@ RunConfiguration *DebuggerRunControl::runConfiguration() const
 {
     return d->m_myRunConfiguration.data();
 }
+
 } // namespace Debugger
diff --git a/src/plugins/debugger/debuggerrunner.h b/src/plugins/debugger/debuggerrunner.h
index 2288161eff..ff97fbb05c 100644
--- a/src/plugins/debugger/debuggerrunner.h
+++ b/src/plugins/debugger/debuggerrunner.h
@@ -120,6 +120,7 @@ public:
                                  QString *errorMessage,
                                  QString *settingsCategory = 0,
                                  QString *settingsPage = 0);
+    QString idString() const;
 
 signals:
     void engineRequestSetup();
diff --git a/src/plugins/debugger/debuggeruiswitcher.cpp b/src/plugins/debugger/debuggeruiswitcher.cpp
index cc2e6a0c3e..80aa00fb91 100644
--- a/src/plugins/debugger/debuggeruiswitcher.cpp
+++ b/src/plugins/debugger/debuggeruiswitcher.cpp
@@ -140,8 +140,6 @@ struct DebuggerUISwitcherPrivate
     QWeakPointer<ProjectExplorer::RunConfiguration> m_previousRunConfiguration;
 
     bool m_initialized;
-
-    static DebuggerUISwitcher *m_instance;
 };
 
 DebuggerUISwitcherPrivate::DebuggerUISwitcherPrivate(DebuggerUISwitcher *q)
@@ -160,8 +158,6 @@ DebuggerUISwitcherPrivate::DebuggerUISwitcherPrivate(DebuggerUISwitcher *q)
 {
 }
 
-DebuggerUISwitcher *DebuggerUISwitcherPrivate::m_instance = 0;
-
 DebuggerUISwitcher::DebuggerUISwitcher(BaseMode *mode, QObject* parent)
   : QObject(parent), d(new DebuggerUISwitcherPrivate(this))
 {
@@ -180,13 +176,10 @@ DebuggerUISwitcher::DebuggerUISwitcher(BaseMode *mode, QObject* parent)
     d->m_debugMenu = am->actionContainer(ProjectExplorer::Constants::M_DEBUG);
     d->m_viewsMenu = am->actionContainer(Core::Id(Core::Constants::M_WINDOW_VIEWS));
     QTC_ASSERT(d->m_viewsMenu, return)
-
-    DebuggerUISwitcherPrivate::m_instance = this;
 }
 
 DebuggerUISwitcher::~DebuggerUISwitcher()
 {
-    DebuggerUISwitcherPrivate::m_instance = 0;
     delete d;
 }
 
@@ -345,11 +338,6 @@ void DebuggerUISwitcher::createViewsMenuItems()
     d->m_viewsMenu->addAction(cmd);
 }
 
-DebuggerUISwitcher *DebuggerUISwitcher::instance()
-{
-    return DebuggerUISwitcherPrivate::m_instance;
-}
-
 void DebuggerUISwitcher::addLanguage(const DebuggerLanguage &languageId, const Context &context)
 {
     bool activate = (d->m_supportedLanguages == AnyLanguage);
@@ -595,20 +583,8 @@ QWidget *DebuggerUISwitcher::createContents(BaseMode *mode)
     return splitter;
 }
 
-void DebuggerUISwitcher::aboutToStartDebugger()
-{
-    if (!DebuggerPlugin::instance()->hasSnapshots())
-        updateActiveLanguages();
-}
-
-void DebuggerUISwitcher::aboutToShutdown()
-{
-    writeSettings();
-}
-
-void DebuggerUISwitcher::writeSettings() const
+void DebuggerUISwitcher::writeSettings(QSettings *settings) const
 {
-    QSettings *settings = ICore::instance()->settings();
     {
         settings->beginGroup(QLatin1String("DebugMode.CppMode"));
         QHashIterator<QString, QVariant> it(d->m_dockWidgetActiveStateCpp);
@@ -629,9 +605,8 @@ void DebuggerUISwitcher::writeSettings() const
     }
 }
 
-void DebuggerUISwitcher::readSettings()
+void DebuggerUISwitcher::readSettings(QSettings *settings)
 {
-    QSettings *settings = ICore::instance()->settings();
     d->m_dockWidgetActiveStateCpp.clear();
     d->m_dockWidgetActiveStateQmlCpp.clear();
 
@@ -660,12 +635,12 @@ void DebuggerUISwitcher::readSettings()
     d->m_activeDebugLanguages = langs;
 }
 
-void DebuggerUISwitcher::initialize()
+void DebuggerUISwitcher::initialize(QSettings *settings)
 {
     createViewsMenuItems();
 
     emit dockResetRequested(AnyLanguage);
-    readSettings();
+    readSettings(settings);
 
     updateUi();
 
diff --git a/src/plugins/debugger/debuggeruiswitcher.h b/src/plugins/debugger/debuggeruiswitcher.h
index b7ec212119..4b243db843 100644
--- a/src/plugins/debugger/debuggeruiswitcher.h
+++ b/src/plugins/debugger/debuggeruiswitcher.h
@@ -37,13 +37,14 @@
 
 QT_BEGIN_NAMESPACE
 class QDockWidget;
+class QSettings;
 QT_END_NAMESPACE
 
 namespace Core {
-    class Command;
-    class Context;
-    class IMode;
-    class BaseMode;
+class Command;
+class Context;
+class IMode;
+class BaseMode;
 }
 
 namespace Utils {
@@ -51,9 +52,9 @@ class FancyMainWindow;
 }
 
 namespace ProjectExplorer {
-    class Project;
-    class Target;
-    class RunConfiguration;
+class Project;
+class Target;
+class RunConfiguration;
 }
 
 namespace Debugger {
@@ -71,8 +72,6 @@ public:
     explicit DebuggerUISwitcher(Core::BaseMode *mode, QObject *parent = 0);
     virtual ~DebuggerUISwitcher();
 
-    static DebuggerUISwitcher *instance();
-
     // debuggable languages are registered with this function.
     void addLanguage(const DebuggerLanguage &language, const Core::Context &context);
 
@@ -90,10 +89,8 @@ public:
     DebuggerLanguages activeDebugLanguages() const;
 
     // called when all dependent plugins have loaded
-    void initialize();
+    void initialize(QSettings *settings);
 
-    void aboutToStartDebugger();
-    void aboutToShutdown();
     void onModeChanged(Core::IMode *mode);
 
     // most common debugger windows
@@ -130,8 +127,11 @@ private slots:
     void updateUiForCurrentRunConfiguration();
     void updateUiOnFileListChange();
 
+public slots:
     void updateActiveLanguages();
     void updateDockWidgetSettings();
+    void readSettings(QSettings *settings);
+    void writeSettings(QSettings *settings) const;
 
 private:
     // Used by MainWindow
@@ -143,8 +143,6 @@ private:
 
     void hideInactiveWidgets();
     void createViewsMenuItems();
-    void readSettings();
-    void writeSettings() const;
     bool isQmlCppActive() const;
     bool isQmlActive() const;
 
diff --git a/src/plugins/debugger/gdb/classicgdbengine.cpp b/src/plugins/debugger/gdb/classicgdbengine.cpp
index 9cc0ed3b77..8f227d2f53 100644
--- a/src/plugins/debugger/gdb/classicgdbengine.cpp
+++ b/src/plugins/debugger/gdb/classicgdbengine.cpp
@@ -32,8 +32,8 @@
 
 #include "abstractgdbadapter.h"
 #include "debuggeractions.h"
+#include "debuggercore.h"
 #include "debuggerstringutils.h"
-#include "debuggerplugin.h"
 
 #include "stackhandler.h"
 #include "watchhandler.h"
@@ -664,7 +664,7 @@ void GdbEngine::handleStackListLocalsClassic(const GdbResponse &response)
                 ? qVariantValue<Debugger::Internal::StackFrame>(response.cookie)
                 : stackHandler()->currentFrame();
         if (frame.isUsable())
-            getUninitializedVariables(plugin()->cppCodeModelSnapshot(),
+            getUninitializedVariables(debuggerCore()->cppCodeModelSnapshot(),
                                       frame.function, frame.file, frame.line,
                                       &uninitializedVariables);
     }
diff --git a/src/plugins/debugger/gdb/gdbengine.cpp b/src/plugins/debugger/gdb/gdbengine.cpp
index 02776557d3..089322f019 100644
--- a/src/plugins/debugger/gdb/gdbengine.cpp
+++ b/src/plugins/debugger/gdb/gdbengine.cpp
@@ -34,6 +34,7 @@
 #include "gdboptionspage.h"
 #include "debuggeruiswitcher.h"
 #include "debuggermainwindow.h"
+#include "debuggercore.h"
 #include "debuggerplugin.h"
 #include "debuggerrunner.h"
 
@@ -203,11 +204,6 @@ DebuggerStartMode GdbEngine::startMode() const
     return startParameters().startMode;
 }
 
-QMainWindow *GdbEngine::mainWindow() const
-{
-    return DebuggerUISwitcher::instance()->mainWindow();
-}
-
 AbstractGdbProcess *GdbEngine::gdbProc() const
 {
     return m_gdbAdapter->gdbProc();
@@ -3077,7 +3073,7 @@ void GdbEngine::handleMakeSnapshot(const GdbResponse &response)
 
 void GdbEngine::reloadRegisters()
 {
-    if (!plugin()->isRegisterViewVisible())
+    if (!debuggerCore()->isRegisterViewVisible())
         return;
 
     if (state() != InferiorStopOk && state() != InferiorUnrunnable)
@@ -4371,7 +4367,7 @@ void GdbEngine::createFullBacktrace()
 void GdbEngine::handleCreateFullBacktrace(const GdbResponse &response)
 {
     if (response.resultClass == GdbResultDone) {
-        plugin()->openTextEditor(_("Backtrace $"),
+        debuggerCore()->openTextEditor(_("Backtrace $"),
             _(response.data.findChild("consolestreamoutput").data()));
     }
 }
diff --git a/src/plugins/debugger/gdb/gdbengine.h b/src/plugins/debugger/gdb/gdbengine.h
index 529d9abff0..396693ee8b 100644
--- a/src/plugins/debugger/gdb/gdbengine.h
+++ b/src/plugins/debugger/gdb/gdbengine.h
@@ -525,7 +525,6 @@ private: ////////// View & Data Stuff //////////
     // Convenience Functions
     //
     QString errorMessage(QProcess::ProcessError error);
-    QMainWindow *mainWindow() const;
     AbstractGdbProcess *gdbProc() const;
     void showExecutionError(const QString &message);
 
diff --git a/src/plugins/debugger/moduleswindow.cpp b/src/plugins/debugger/moduleswindow.cpp
index 8cff2955ff..e73cab44a6 100644
--- a/src/plugins/debugger/moduleswindow.cpp
+++ b/src/plugins/debugger/moduleswindow.cpp
@@ -31,8 +31,8 @@
 
 #include "debuggeractions.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
 
 #include <utils/qtcassert.h>
 #include <utils/savedaction.h>
@@ -53,16 +53,6 @@
 namespace Debugger {
 namespace Internal {
 
-static DebuggerPlugin *plugin()
-{
-    return DebuggerPlugin::instance();
-}
-
-static DebuggerEngine *currentEngine()
-{
-    return DebuggerPlugin::instance()->currentEngine();
-}
-
 ModulesWindow::ModulesWindow(QWidget *parent)
   : QTreeView(parent), m_alwaysResizeColumnsToContents(false)
 {
@@ -82,23 +72,7 @@ ModulesWindow::ModulesWindow(QWidget *parent)
 
 void ModulesWindow::moduleActivated(const QModelIndex &index)
 {
-    plugin()->gotoLocation(index.data().toString());
-}
-
-void ModulesWindow::resizeEvent(QResizeEvent *event)
-{
-    //QHeaderView *hv = header();
-    //int totalSize = event->size().width() - 110;
-    //hv->resizeSection(0, totalSize / 4);
-    //hv->resizeSection(1, totalSize / 4);
-    //hv->resizeSection(2, totalSize / 4);
-    //hv->resizeSection(3, totalSize / 4);
-    //hv->resizeSection(0, 60);
-    //hv->resizeSection(1, (totalSize * 50) / 100);
-    //hv->resizeSection(2, (totalSize * 50) / 100);
-    //hv->resizeSection(3, 50);
-    //setColumnHidden(3, true);
-    QTreeView::resizeEvent(event);
+    debuggerCore()->gotoLocation(index.data().toString());
 }
 
 void ModulesWindow::contextMenuEvent(QContextMenuEvent *ev)
@@ -110,7 +84,7 @@ void ModulesWindow::contextMenuEvent(QContextMenuEvent *ev)
     if (index.isValid())
         name = index.data().toString();
 
-    DebuggerEngine *engine = currentEngine();
+    DebuggerEngine *engine = debuggerCore()->currentEngine();
     const bool enabled = engine->debuggerActionsEnabled();
     const unsigned capabilities = engine->debuggerCapabilities();
 
@@ -191,7 +165,7 @@ void ModulesWindow::contextMenuEvent(QContextMenuEvent *ev)
     } else if (act == actLoadSymbolsForModule) {
         engine->loadSymbols(name);
     } else if (act == actEditFile) {
-        plugin()->gotoLocation(name);
+        debuggerCore()->gotoLocation(name);
     } else if (act == actShowSymbols) {
         // FIXME setModelData(RequestModuleSymbolsRole, name);
     }
diff --git a/src/plugins/debugger/moduleswindow.h b/src/plugins/debugger/moduleswindow.h
index 49976ecc0e..87fc191ed7 100644
--- a/src/plugins/debugger/moduleswindow.h
+++ b/src/plugins/debugger/moduleswindow.h
@@ -49,7 +49,6 @@ private slots:
     void setAlternatingRowColorsHelper(bool on) { setAlternatingRowColors(on); }
 
 private:
-    void resizeEvent(QResizeEvent *ev);
     void contextMenuEvent(QContextMenuEvent *ev);
     void setModel(QAbstractItemModel *model);
 
diff --git a/src/plugins/debugger/qml/qmlcppengine.cpp b/src/plugins/debugger/qml/qmlcppengine.cpp
index 20b3901ea7..8cd04b7557 100644
--- a/src/plugins/debugger/qml/qmlcppengine.cpp
+++ b/src/plugins/debugger/qml/qmlcppengine.cpp
@@ -1,7 +1,7 @@
 #include "qmlcppengine.h"
 #include "qmlengine.h"
 #include "debuggeruiswitcher.h"
-#include "debuggerplugin.h"
+#include "debuggercore.h"
 
 #include <qmljseditor/qmljseditorconstants.h>
 #include <coreplugin/editormanager/editormanager.h>
@@ -124,7 +124,7 @@ void QmlCppEngine::setActiveEngine(DebuggerLanguage language)
     }
     if (previousEngine != d->m_activeEngine) {
         showStatusMessage(tr("%1 debugger activated").arg(engineName));
-        plugin()->displayDebugger(d->m_activeEngine, updateEngine);
+        Internal::debuggerCore()->displayDebugger(d->m_activeEngine, updateEngine);
     }
 }
 
diff --git a/src/plugins/debugger/qml/qmlengine.cpp b/src/plugins/debugger/qml/qmlengine.cpp
index 99232c51fc..b41b0a5f04 100644
--- a/src/plugins/debugger/qml/qmlengine.cpp
+++ b/src/plugins/debugger/qml/qmlengine.cpp
@@ -33,7 +33,6 @@
 #include "debuggeractions.h"
 #include "debuggertooltip.h"
 #include "debuggerconstants.h"
-#include "debuggerplugin.h"
 #include "debuggerdialogs.h"
 #include "debuggerstringutils.h"
 #include "debuggeruiswitcher.h"
@@ -236,36 +235,37 @@ void QmlEngine::connectionEstablished()
 {
     attemptBreakpointSynchronization();
 
-    ExtensionSystem::PluginManager *pluginManager = ExtensionSystem::PluginManager::instance();
+    ExtensionSystem::PluginManager *pluginManager =
+        ExtensionSystem::PluginManager::instance();
     pluginManager->addObject(d->m_adapter);
     pluginManager->addObject(this);
     d->m_addedAdapterToObjectPool = true;
 
-    plugin()->showMessage(tr("QML Debugger connected."), StatusBar);
+    showMessage(tr("QML Debugger connected."), StatusBar);
 
     notifyEngineRunAndInferiorRunOk();
 }
 
 void QmlEngine::connectionStartupFailed()
 {
-    QMessageBox::critical(0,
-                          tr("Failed to connect to debugger"),
-                          tr("Could not connect to QML debugger server at %1:%2.")
-                          .arg(startParameters().qmlServerAddress)
-                          .arg(startParameters().qmlServerPort));
+    QMessageBox::critical(0, tr("Failed to connect to debugger"),
+        tr("Could not connect to QML debugger server at %1:%2.")
+        .arg(startParameters().qmlServerAddress)
+        .arg(startParameters().qmlServerPort));
     notifyEngineRunFailed();
 }
 
 void QmlEngine::connectionError(QAbstractSocket::SocketError socketError)
 {
     if (socketError ==QAbstractSocket::RemoteHostClosedError)
-        plugin()->showMessage(tr("QML Debugger: Remote host closed connection."), StatusBar);
+        showMessage(tr("QML Debugger: Remote host closed connection."), StatusBar);
 }
 
 
 void QmlEngine::serviceConnectionError(const QString &serviceName)
 {
-    showMessage(tr("QML Debugger: Could not connect to service '%1'.").arg(serviceName), StatusBar);
+    showMessage(tr("QML Debugger: Could not connect to service '%1'.")
+        .arg(serviceName), StatusBar);
 }
 
 void QmlEngine::runEngine()
@@ -371,7 +371,7 @@ void QmlEngine::shutdownEngine()
     shutdownEngineAsSlave();
 
     notifyEngineShutdownOk();
-    plugin()->showMessage(QString(), StatusBar);
+    showMessage(QString(), StatusBar);
 }
 
 void QmlEngine::setupEngine()
@@ -756,7 +756,7 @@ void QmlEngine::messageReceived(const QByteArray &message)
         if (iname.startsWith("watch.")) {
             watchHandler()->insertData(data);
         } else if(iname == "console") {
-            plugin()->showMessage(data.value, ScriptConsoleOutput);
+            showMessage(data.value, ScriptConsoleOutput);
         } else {
             qWarning() << "QmlEngine: Unexcpected result: " << iname << data.value;
         }
@@ -807,7 +807,7 @@ void QmlEngine::messageReceived(const QByteArray &message)
 
 void QmlEngine::disconnected()
 {
-    plugin()->showMessage(tr("QML Debugger disconnected."), StatusBar);
+    showMessage(tr("QML Debugger disconnected."), StatusBar);
     notifyInferiorExited();
 }
 
diff --git a/src/plugins/debugger/registerwindow.cpp b/src/plugins/debugger/registerwindow.cpp
index c893957684..053b23719f 100644
--- a/src/plugins/debugger/registerwindow.cpp
+++ b/src/plugins/debugger/registerwindow.cpp
@@ -30,9 +30,9 @@
 #include "registerwindow.h"
 
 #include "debuggeractions.h"
-#include "debuggerplugin.h"
 #include "debuggeragents.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
 #include "registerhandler.h"
 #include "watchdelegatewidgets.h"
@@ -54,7 +54,7 @@ namespace Internal {
 
 static DebuggerEngine *currentEngine()
 {
-    return DebuggerPlugin::instance()->currentEngine();
+    return debuggerCore()->currentEngine();
 }
 
 static RegisterHandler *currentHandler()
diff --git a/src/plugins/debugger/sourcefileswindow.cpp b/src/plugins/debugger/sourcefileswindow.cpp
index 0267ca89f3..f7bcadf213 100644
--- a/src/plugins/debugger/sourcefileswindow.cpp
+++ b/src/plugins/debugger/sourcefileswindow.cpp
@@ -31,8 +31,8 @@
 
 #include "debuggeractions.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
 
 #include <utils/qtcassert.h>
 #include <utils/savedaction.h>
@@ -54,14 +54,9 @@
 namespace Debugger {
 namespace Internal {
 
-static DebuggerPlugin *plugin()
-{
-    return DebuggerPlugin::instance();
-}
-
 static DebuggerEngine *currentEngine()
 {
-    return DebuggerPlugin::instance()->currentEngine();
+    return debuggerCore()->currentEngine();
 }
 
 SourceFilesWindow::SourceFilesWindow(QWidget *parent)
@@ -86,7 +81,7 @@ SourceFilesWindow::SourceFilesWindow(QWidget *parent)
 
 void SourceFilesWindow::sourceFileActivated(const QModelIndex &index)
 {
-    plugin()->gotoLocation(index.data().toString());
+    debuggerCore()->gotoLocation(index.data().toString());
 }
 
 void SourceFilesWindow::contextMenuEvent(QContextMenuEvent *ev)
@@ -120,7 +115,7 @@ void SourceFilesWindow::contextMenuEvent(QContextMenuEvent *ev)
     if (act == act1)
         currentEngine()->reloadSourceFiles();
     else if (act == act2)
-        plugin()->gotoLocation(name);
+        debuggerCore()->gotoLocation(name);
 }
 
 } // namespace Internal
diff --git a/src/plugins/debugger/stackwindow.cpp b/src/plugins/debugger/stackwindow.cpp
index d7e61330b3..f5720e2644 100644
--- a/src/plugins/debugger/stackwindow.cpp
+++ b/src/plugins/debugger/stackwindow.cpp
@@ -33,8 +33,8 @@
 #include "debuggeractions.h"
 #include "debuggeragents.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
 
 #include <utils/qtcassert.h>
 #include <utils/savedaction.h>
@@ -52,7 +52,7 @@ namespace Internal {
 
 static DebuggerEngine *currentEngine()
 {
-    return DebuggerPlugin::instance()->currentEngine();
+    return debuggerCore()->currentEngine();
 }
 
 StackWindow::StackWindow(QWidget *parent)
diff --git a/src/plugins/debugger/threadswindow.cpp b/src/plugins/debugger/threadswindow.cpp
index 622251ec80..e63ba6656e 100644
--- a/src/plugins/debugger/threadswindow.cpp
+++ b/src/plugins/debugger/threadswindow.cpp
@@ -32,8 +32,8 @@
 #include "threadshandler.h"
 #include "debuggeractions.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
 
 #include <utils/savedaction.h>
 
@@ -66,7 +66,7 @@ ThreadsWindow::ThreadsWindow(QWidget *parent)
 
 void ThreadsWindow::rowActivated(const QModelIndex &index)
 {
-    DebuggerPlugin::instance()->currentEngine()->selectThread(index.row());
+    debuggerCore()->currentEngine()->selectThread(index.row());
 }
 
 void ThreadsWindow::contextMenuEvent(QContextMenuEvent *ev)
diff --git a/src/plugins/debugger/watchhandler.cpp b/src/plugins/debugger/watchhandler.cpp
index 38ca032426..46b2cb4f2f 100644
--- a/src/plugins/debugger/watchhandler.cpp
+++ b/src/plugins/debugger/watchhandler.cpp
@@ -32,8 +32,8 @@
 #include "breakhandler.h"
 #include "debuggeractions.h"
 #include "debuggeragents.h"
+#include "debuggercore.h"
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
 #include "watchutils.h"
 
 #if USE_MODEL_TEST
@@ -75,8 +75,6 @@ static const QString strNotInScope =
 static int watcherCounter = 0;
 static int generationCounter = 0;
 
-static DebuggerPlugin *plugin() { return DebuggerPlugin::instance(); }
-
 QHash<QByteArray, int> WatchHandler::m_watcherNames;
 QHash<QByteArray, int> WatchHandler::m_typeFormats;
 
@@ -1461,7 +1459,7 @@ void WatchHandler::removeWatchExpression(const QString &exp0)
 void WatchHandler::updateWatchersWindow()
 {
     // Force show/hide of watchers and return view.
-    plugin()->updateState(m_engine);
+    debuggerCore()->updateState(m_engine);
 }
 
 void WatchHandler::updateWatchers()
@@ -1480,7 +1478,7 @@ void WatchHandler::updateWatchers()
 
 void WatchHandler::loadWatchers()
 {
-    QVariant value = plugin()->sessionValue("Watchers");
+    QVariant value = debuggerCore()->sessionValue("Watchers");
     foreach (const QString &exp, value.toStringList())
         m_watcherNames[exp.toLatin1()] = watcherCounter++;
 
@@ -1504,12 +1502,12 @@ QStringList WatchHandler::watchedExpressions()
 void WatchHandler::saveWatchers()
 {
     //qDebug() << "SAVE WATCHERS: " << m_watchers;
-    plugin()->setSessionValue("Watchers", QVariant(watchedExpressions()));
+    debuggerCore()->setSessionValue("Watchers", QVariant(watchedExpressions()));
 }
 
 void WatchHandler::loadTypeFormats()
 {
-    QVariant value = plugin()->sessionValue("DefaultFormats");
+    QVariant value = debuggerCore()->sessionValue("DefaultFormats");
     QMap<QString, QVariant> typeFormats = value.toMap();
     QMapIterator<QString, QVariant> it(typeFormats);
     while (it.hasNext()) {
@@ -1532,7 +1530,7 @@ void WatchHandler::saveTypeFormats()
                 typeFormats.insert(key, format);
         }
     }
-    plugin()->setSessionValue("DefaultFormats", QVariant(typeFormats));
+    debuggerCore()->setSessionValue("DefaultFormats", QVariant(typeFormats));
 }
 
 void WatchHandler::saveSessionData()
diff --git a/src/plugins/debugger/watchwindow.cpp b/src/plugins/debugger/watchwindow.cpp
index 10e01f5d23..bcab265b8f 100644
--- a/src/plugins/debugger/watchwindow.cpp
+++ b/src/plugins/debugger/watchwindow.cpp
@@ -33,9 +33,9 @@
 #include "debuggeragents.h"
 #include "debuggeractions.h"
 #include "debuggerconstants.h"
+#include "debuggercore.h"
 #include "debuggerdialogs.h"
 #include "debuggerengine.h"
-#include "debuggerplugin.h"
 #include "watchdelegatewidgets.h"
 #include "watchhandler.h"
 
@@ -63,14 +63,9 @@
 namespace Debugger {
 namespace Internal {
 
-static DebuggerPlugin *plugin()
-{
-    return DebuggerPlugin::instance();
-}
-
 static DebuggerEngine *currentEngine()
 {
-    return DebuggerPlugin::instance()->currentEngine();
+    return debuggerCore()->currentEngine();
 }
 
 class WatchDelegate : public QItemDelegate
@@ -461,14 +456,14 @@ void WatchWindow::contextMenuEvent(QContextMenuEvent *ev)
     } else if (act == actRemoveWatchExpression) {
         removeWatchExpression(exp);
     } else if (act == actClearCodeModelSnapshot) {
-        plugin()->clearCppCodeModelSnapshot();
+        debuggerCore()->clearCppCodeModelSnapshot();
     } else if (act == clearTypeFormatAction) {
         setModelData(LocalsTypeFormatRole, -1, mi1);
     } else if (act == clearIndividualFormatAction) {
         setModelData(LocalsIndividualFormatRole, -1, mi1);
     } else if (act == actShowInEditor) {
         QString contents = handler->editorContents();
-        plugin()->openTextEditor(tr("Locals & Watchers"), contents);
+        debuggerCore()->openTextEditor(tr("Locals & Watchers"), contents);
     } else {
         for (int i = 0; i != typeFormatActions.size(); ++i) {
             if (act == typeFormatActions.at(i))
diff --git a/src/plugins/qmljsinspector/qmljsinspector.cpp b/src/plugins/qmljsinspector/qmljsinspector.cpp
index 66c9b4333a..8cbc61e87d 100644
--- a/src/plugins/qmljsinspector/qmljsinspector.cpp
+++ b/src/plugins/qmljsinspector/qmljsinspector.cpp
@@ -463,7 +463,7 @@ void InspectorUi::reloadQmlViewer()
 
 void InspectorUi::setSimpleDockWidgetArrangement(const Debugger::DebuggerLanguages &activeLanguages)
 {
-    Debugger::DebuggerUISwitcher *uiSwitcher = Debugger::DebuggerUISwitcher::instance();
+    Debugger::DebuggerUISwitcher *uiSwitcher = Debugger::DebuggerPlugin::uiSwitcher();
     Utils::FancyMainWindow *mw = uiSwitcher->mainWindow();
 
     mw->setTrackingEnabled(false);
@@ -592,7 +592,7 @@ bool InspectorUi::addQuotesForData(const QVariant &value) const
 
 void InspectorUi::setupDockWidgets()
 {
-    Debugger::DebuggerUISwitcher *uiSwitcher = Debugger::DebuggerUISwitcher::instance();
+    Debugger::DebuggerUISwitcher *uiSwitcher = Debugger::DebuggerPlugin::uiSwitcher();
 
     m_toolbar->createActions(Core::Context(Debugger::Constants::C_QMLDEBUGGER));
     m_toolbar->setObjectName("QmlInspectorToolbar");
diff --git a/src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp b/src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp
index d1876648e3..3e5b1b22ae 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp
@@ -144,23 +144,22 @@ QmlRunControlFactory::~QmlRunControlFactory()
 bool QmlRunControlFactory::canRun(RunConfiguration *runConfiguration,
                                   const QString &mode) const
 {
-    QmlProjectRunConfiguration *config = qobject_cast<QmlProjectRunConfiguration*>(runConfiguration);
-    if (mode == ProjectExplorer::Constants::RUNMODE) {
+    QmlProjectRunConfiguration *config =
+        qobject_cast<QmlProjectRunConfiguration*>(runConfiguration);
+    if (mode == ProjectExplorer::Constants::RUNMODE)
         return config != 0 && !config->viewerPath().isEmpty();
-    } else {
-        bool qmlDebugSupportInstalled = Debugger::DebuggerUISwitcher::instance()->supportedLanguages()
-                                        & Debugger::QmlLanguage;
-
-        if (config && qmlDebugSupportInstalled) {
-            if (!config->observerPath().isEmpty()) {
-                return true;
-            }
-
-            if (config->qtVersion() && Qt4ProjectManager::QmlObserverTool::canBuild(config->qtVersion())) {
-                return true;
-            } else {
-                return false;
-            }
+
+    bool qmlDebugSupportInstalled =
+            Debugger::DebuggerPlugin::isActiveDebugLanguage(Debugger::QmlLanguage);
+
+    if (config && qmlDebugSupportInstalled) {
+        if (!config->observerPath().isEmpty())
+            return true;
+
+        if (config->qtVersion() && Qt4ProjectManager::QmlObserverTool::canBuild(config->qtVersion())) {
+            return true;
+        } else {
+            return false;
         }
     }
 
@@ -212,8 +211,7 @@ ProjectExplorer::RunControl *QmlRunControlFactory::createDebugRunControl(QmlProj
         return 0;
     }
 
-    Debugger::DebuggerRunControl *debuggerRunControl = Debugger::DebuggerPlugin::createDebugger(params, runConfig);
-    return debuggerRunControl;
+    return Debugger::DebuggerPlugin::createDebugger(params, runConfig);
 }
 
 void QmlRunControlFactory::showQmlObserverToolWarning() {
diff --git a/src/plugins/qt4projectmanager/qt-s60/s60manager.cpp b/src/plugins/qt4projectmanager/qt-s60/s60manager.cpp
index cb0dae8594..7f963d8d33 100644
--- a/src/plugins/qt4projectmanager/qt-s60/s60manager.cpp
+++ b/src/plugins/qt4projectmanager/qt-s60/s60manager.cpp
@@ -44,7 +44,6 @@
 #include <coreplugin/icore.h>
 #include <extensionsystem/pluginmanager.h>
 #include <projectexplorer/projectexplorerconstants.h>
-#include <debugger/debuggerplugin.h>
 #include <utils/qtcassert.h>
 
 #include <QtGui/QMainWindow>
@@ -122,11 +121,10 @@ S60Manager::S60Manager(QObject *parent)
     addAutoReleasedObject(new S60CreatePackageStepFactory);
     addAutoReleasedObject(new S60DeployStepFactory);
 
-    if (Debugger::DebuggerPlugin::instance())
-        addAutoReleasedObject(new RunControlFactory<S60DeviceDebugRunControl,
-                                                S60DeviceRunConfiguration>
-                                                (QLatin1String(ProjectExplorer::Constants::DEBUGMODE),
-                                                 tr("Debug on Device"), parent));
+    addAutoReleasedObject(new RunControlFactory<S60DeviceDebugRunControl,
+                                            S60DeviceRunConfiguration>
+                                            (QLatin1String(ProjectExplorer::Constants::DEBUGMODE),
+                                             tr("Debug on Device"), parent));
     updateQtVersions();
     connect(m_devices, SIGNAL(qtVersionsChanged()),
             this, SLOT(updateQtVersions()));