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diff --git a/src/qml/jsruntime/qv4debugging_p.h b/src/qml/jsruntime/qv4debugging_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DEBUGGING_H
+#define DEBUGGING_H
+
+#include "qv4global_p.h"
+#include "qv4engine_p.h"
+#include "qv4context_p.h"
+
+#include <QHash>
+#include <QThread>
+#include <QMutex>
+#include <QWaitCondition>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+struct Function;
+
+namespace Debugging {
+
+class DebuggerAgent;
+
+class Q_QML_EXPORT Debugger
+{
+public:
+    enum State {
+        Running,
+        Paused
+    };
+
+    Debugger(ExecutionEngine *_engine);
+    ~Debugger();
+
+    void attachToAgent(DebuggerAgent *agent);
+    void detachFromAgent();
+
+    void pause();
+    void resume();
+
+    State state() const { return m_state; }
+
+    void addBreakPoint(const QString &fileName, int lineNumber);
+    void removeBreakPoint(const QString &fileName, int lineNumber);
+
+    struct ExecutionState
+    {
+        ExecutionState() : lineNumber(-1), function(0) {}
+        QString fileName;
+        int lineNumber;
+        Function *function;
+    };
+
+    ExecutionState currentExecutionState(const uchar *code = 0) const;
+
+    bool pauseAtNextOpportunity() const {
+        return m_pauseRequested || m_havePendingBreakPoints;
+    }
+    void setPendingBreakpoints(Function *function);
+
+public: // compile-time interface
+    void maybeBreakAtInstruction(const uchar *code, bool breakPointHit);
+
+public: // execution hooks
+    void aboutToThrow(const Value &value);
+
+private:
+    // requires lock to be held
+    void pauseAndWait();
+
+    void applyPendingBreakPoints();
+
+    struct BreakPoints : public QHash<QString, QList<int> >
+    {
+        void add(const QString &fileName, int lineNumber);
+        bool remove(const QString &fileName, int lineNumber);
+        bool contains(const QString &fileName, int lineNumber) const;
+        void applyToFunction(Function *function, bool removeBreakPoints);
+    };
+
+    QV4::ExecutionEngine *_engine;
+    DebuggerAgent *m_agent;
+    QMutex m_lock;
+    QWaitCondition m_runningCondition;
+    State m_state;
+    bool m_pauseRequested;
+    bool m_havePendingBreakPoints;
+    BreakPoints m_pendingBreakPointsToAdd;
+    BreakPoints m_pendingBreakPointsToAddToFutureCode;
+    BreakPoints m_pendingBreakPointsToRemove;
+    const uchar *m_currentInstructionPointer;
+};
+
+class Q_QML_EXPORT DebuggerAgent : public QObject
+{
+    Q_OBJECT
+public:
+    ~DebuggerAgent();
+
+    void addDebugger(Debugger *debugger);
+    void removeDebugger(Debugger *debugger);
+
+    void pause(Debugger *debugger);
+    void addBreakPoint(Debugger *debugger, const QString &fileName, int lineNumber);
+    void removeBreakPoint(Debugger *debugger, const QString &fileName, int lineNumber);
+
+    Q_INVOKABLE virtual void debuggerPaused(QV4::Debugging::Debugger *debugger) = 0;
+
+protected:
+    QList<Debugger *> m_debuggers;
+};
+
+} // namespace Debugging
+} // namespace QV4
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QV4::Debugging::Debugger*)
+
+#endif // DEBUGGING_H