Debugger[CDB]: Re-introduce signal-slot connection for output.

...to fix multithread crash.
Fix exit crash by temporarily removing output.

src/plugins/debugger/cdb/cdbdebugengine.cpp

@@ -119,8 +119,7 @@ static QString msgFunctionFailed(const char *func, const QString &why)
 
 // --- CdbDebugEnginePrivate
 
-CdbDebugEnginePrivate::CdbDebugEnginePrivate(DebuggerManager *manager,
-                                             const QSharedPointer<CdbOptions> &options,
+CdbDebugEnginePrivate::CdbDebugEnginePrivate(const QSharedPointer<CdbOptions> &options,
                                              CdbDebugEngine *engine) :
     m_options(options),
     m_hDebuggeeProcess(0),
@@ -149,7 +148,10 @@ bool CdbDebugEnginePrivate::init(QString *errorMessage)
 
     if (!CdbCore::CoreEngine::init(m_options->path, errorMessage))
         return false;
-    CdbDebugOutput *output = new CdbDebugOutput(m_engine);
+    CdbDebugOutput *output = new CdbDebugOutput;
+    connect(output, SIGNAL(showMessage(QString,int,int)),
+            m_engine, SLOT(showMessage(QString,int,int)),
+            Qt::QueuedConnection); // Multithread invocation when loading dumpers.
     setDebugOutput(DebugOutputBasePtr(output));
     setDebugEventCallback(DebugEventCallbackBasePtr(new CdbDebugEventCallback(m_engine)));
     updateCodeLevel();
@@ -212,7 +214,7 @@ void CdbDebugEnginePrivate::cleanStackTrace()
 
 CdbDebugEngine::CdbDebugEngine(DebuggerManager *manager, const QSharedPointer<CdbOptions> &options) :
     IDebuggerEngine(manager),
-    m_d(new CdbDebugEnginePrivate(manager, options, this))
+    m_d(new CdbDebugEnginePrivate(options, this))
 {
     m_d->m_consoleStubProc.setMode(Utils::ConsoleProcess::Suspend);
     connect(&m_d->m_consoleStubProc, SIGNAL(processMessage(QString,bool)),

src/plugins/debugger/cdb/cdbdebugengine_p.h

@@ -68,8 +68,7 @@ public:
         StoppedOther
     };
 
-    explicit CdbDebugEnginePrivate(DebuggerManager *parent,
-                                   const QSharedPointer<CdbOptions> &options,
+    explicit CdbDebugEnginePrivate(const QSharedPointer<CdbOptions> &options,
                                    CdbDebugEngine* engine);
     ~CdbDebugEnginePrivate();
     bool init(QString *errorMessage);

src/plugins/debugger/cdb/cdbdebugoutput.cpp

@@ -28,12 +28,9 @@
 **************************************************************************/
 
 #include "cdbdebugoutput.h"
-#include "cdbdebugengine.h"
+#include "debuggerrunner.h"
 #include "cdbdebugengine_p.h"
 #include "cdbcom.h"
-#include "debuggerrunner.h"
-
-#include <utils/qtcassert.h>
 
 namespace Debugger {
 namespace Internal {
@@ -61,18 +58,15 @@ static int logChannel(ULONG mask)
     return LogMisc;
 }
 
-CdbDebugOutput::CdbDebugOutput(CdbDebugEngine *engine)
-  : m_engine(engine)
+CdbDebugOutput::CdbDebugOutput()
 {
 }
 
 void CdbDebugOutput::output(ULONG mask, const QString &msg)
 {
-    DebuggerRunControl *runControl = m_engine->runControl();
-    QTC_ASSERT(runControl, return);
     if (debugCDB > 1)
         qDebug() << Q_FUNC_INFO << "\n    " << msg;
-    runControl->showMessage(msg, logChannel(mask));
+    emit showMessage(msg, logChannel(mask), -1);
 }
 
 } // namespace Internal

src/plugins/debugger/cdb/cdbdebugoutput.h

@@ -37,19 +37,18 @@
 namespace Debugger {
 namespace Internal {
 
-class CdbDebugEngine;
-
 // Standard CDB output handler
-class CdbDebugOutput : public CdbCore::DebugOutputBase
+class CdbDebugOutput : public QObject, public CdbCore::DebugOutputBase
 {
+    Q_OBJECT
 public:
-    explicit CdbDebugOutput(CdbDebugEngine *engine);
+    CdbDebugOutput();
+
+signals:
+    void showMessage(const QString &output, int channel, int timeout);
 
 protected:
     virtual void output(ULONG mask, const QString &message);
-
-private:
-    CdbDebugEngine *m_engine;
 };
 
 } // namespace Internal

src/plugins/debugger/debuggermanager.cpp

@@ -874,7 +874,7 @@ void DebuggerManager::notifyInferiorPidChanged(qint64 pid)
 
 void DebuggerManager::aboutToShutdown()
 {
-    STATE_DEBUG(d->m_engine);
+    // TODO: STATE_DEBUG(d->m_engine);
     if (d->m_engine)
         d->m_engine->shutdown();
     d->m_engine = 0;

src/plugins/debugger/idebuggerengine.h

@@ -132,6 +132,7 @@ public:
     virtual bool isSynchroneous() const { return false; }
     virtual QString qtNamespace() const { return QString(); }
 
+public slots:
     // Convenience
     void showMessage(const QString &msg, int channel = LogDebug, int timeout = -1) const;
     void showStatusMessage(const QString &msg, int timeout = -1) const