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/**************************************************************************
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**
** This file is part of Qt Creator
**
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** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** Commercial Usage
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**
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** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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**
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** 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.
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**
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://qt.nokia.com/contact.
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**
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**************************************************************************/
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#ifndef DEBUGGER_GDBENGINE_H
#define DEBUGGER_GDBENGINE_H

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#include "idebuggerengine.h"
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#include "debuggermanager.h" // only for StartParameters
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#include "gdbmi.h"
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#include "watchutils.h"
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#include <QtCore/QByteArray>
#include <QtCore/QHash>
#include <QtCore/QMap>
#include <QtCore/QObject>
#include <QtCore/QProcess>
#include <QtCore/QPoint>
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#include <QtCore/QSet>
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#include <QtCore/QTextCodec>
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#include <QtCore/QTime>
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#include <QtCore/QVariant>

QT_BEGIN_NAMESPACE
class QAction;
class QAbstractItemModel;
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class QTimer;
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class QWidget;
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class QMainWindow;
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QT_END_NAMESPACE

namespace Debugger {
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class DebuggerManager;
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namespace Internal {

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class AbstractGdbAdapter;
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class GdbResponse;
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class GdbMi;

class BreakpointData;
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class WatchData;
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class AttachGdbAdapter;
class CoreGdbAdapter;
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class PlainGdbAdapter;
class RemoteGdbAdapter;
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class TrkGdbAdapter;
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struct TrkOptions;
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enum DebuggingHelperState
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{
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    DebuggingHelperUninitialized,
    DebuggingHelperLoadTried,
    DebuggingHelperAvailable,
    DebuggingHelperUnavailable,
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};

class GdbEngine : public IDebuggerEngine
{
    Q_OBJECT

public:
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    explicit GdbEngine(DebuggerManager *manager);
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    ~GdbEngine();

private:
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    friend class AbstractGdbAdapter;
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    friend class AttachGdbAdapter;
    friend class CoreGdbAdapter;
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    friend class PlainGdbAdapter;
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    friend class TermGdbAdapter;
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    friend class RemoteGdbAdapter;
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    friend class TrkGdbAdapter;
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private: ////////// General Interface //////////
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    virtual void addOptionPages(QList<Core::IOptionsPage*> *opts) const;
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    virtual bool checkConfiguration(int toolChain, QString *errorMessage, QString *settingsPage= 0) const;
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    virtual bool isGdbEngine() const { return true; }
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    virtual void startDebugger(const DebuggerStartParametersPtr &sp);
    virtual void exitDebugger();
    virtual void detachDebugger();
    virtual void shutdown();
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    virtual void executeDebuggerCommand(const QString &command);
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    virtual QString qtNamespace() const { return m_dumperHelper.qtNamespace(); }
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private: ////////// General State //////////
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    void initializeVariables();
    DebuggerStartMode startMode() const;
    const DebuggerStartParameters &startParameters() const
        { return *m_startParameters; }
    Q_SLOT void setAutoDerefPointers(const QVariant &on);
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    DebuggerStartParametersPtr m_startParameters;
    QSharedPointer<TrkOptions> m_trkOptions;
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    bool m_registerNamesListed;
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private: ////////// Gdb Process Management //////////
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    AbstractGdbAdapter *createAdapter(const DebuggerStartParametersPtr &dp);
    void connectAdapter();
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    bool startGdb(const QStringList &args = QStringList(),
                  const QString &gdb = QString(),
                  const QString &settingsIdHint = QString());
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    void startInferiorPhase2();
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    void handleInferiorShutdown(const GdbResponse &response);
    void handleGdbExit(const GdbResponse &response);

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    void gdbInputAvailable(int channel, const QString &msg)
    { m_manager->showDebuggerInput(channel, msg); }
    void gdbOutputAvailable(int channel, const QString &msg)
    { m_manager->showDebuggerOutput(channel, msg); }
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private slots:
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    void handleGdbFinished(int, QProcess::ExitStatus status);
    void handleGdbError(QProcess::ProcessError error);
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    void readGdbStandardOutput();
    void readGdbStandardError();
    void readDebugeeOutput(const QByteArray &data);
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    void handleAdapterStarted();
    void handleAdapterStartFailed(const QString &msg, const QString &settingsIdHint = QString());
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    void handleInferiorPrepared();

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    void handleInferiorStartFailed(const QString &msg);

    void handleAdapterCrashed(const QString &msg);
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private:
    QTextCodec *m_outputCodec;
    QTextCodec::ConverterState m_outputCodecState;

    QByteArray m_inbuffer;
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    bool m_busy;
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    QProcess m_gdbProc;
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    AbstractGdbAdapter *m_gdbAdapter;

private: ////////// Gdb Command Management //////////

    public: // otherwise the Qt flag macros are unhappy
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    enum GdbCommandFlag {
        NoFlags = 0,
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        NeedsStop = 1,    // The command needs a stopped inferior
        Discardable = 2,  // No need to wait for the reply before continuing inferior
        RebuildModel = 4, // Trigger model rebuild when no such commands are pending any more
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        WatchUpdate = Discardable | RebuildModel,
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        EmbedToken = 8,   // Expand %1 in the command to the command token
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        RunRequest = 16,  // Callback expects GdbResultRunning instead of GdbResultDone
        ExitRequest = 32, // Callback expects GdbResultExit instead of GdbResultDone
        LosesChild = 64   // Auto-set inferior shutdown related states
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    };
    Q_DECLARE_FLAGS(GdbCommandFlags, GdbCommandFlag)
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    private:
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    typedef void (GdbEngine::*GdbCommandCallback)
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        (const GdbResponse &response);
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    typedef void (AbstractGdbAdapter::*AdapterCallback)
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        (const GdbResponse &response);
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    struct GdbCommand
    {
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        GdbCommand()
            : flags(0), callback(0), adapterCallback(0), callbackName(0)
        {}
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        int flags;
        GdbCommandCallback callback;
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        AdapterCallback adapterCallback;
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        const char *callbackName;
        QString command;
        QVariant cookie;
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        QTime postTime;
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    };

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    // type and cookie are sender-internal data, opaque for the "event
    // queue". resultNeeded == true increments m_pendingResults on
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    // send and decrements on receipt, effectively preventing
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    // watch model updates before everything is finished.
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    void flushCommand(const GdbCommand &cmd);
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    void postCommand(const QString &command,
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                     GdbCommandFlags flags,
                     GdbCommandCallback callback = 0,
                     const char *callbackName = 0,
                     const QVariant &cookie = QVariant());
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    void postCommand(const QString &command,
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                     GdbCommandCallback callback = 0,
                     const char *callbackName = 0,
                     const QVariant &cookie = QVariant());
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    void postCommand(const QString &command,
                     AdapterCallback callback,
                     const char *callbackName,
                     const QVariant &cookie = QVariant());
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    void postCommand(const QString &command,
                     GdbCommandFlags flags,
                     AdapterCallback callback,
                     const char *callbackName,
                     const QVariant &cookie = QVariant());
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    void postCommandHelper(const GdbCommand &cmd);
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    void flushQueuedCommands();
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    Q_SLOT void commandTimeout();
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    void setTokenBarrier();

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    QHash<int, GdbCommand> m_cookieForToken;
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    QTimer *m_commandTimer;
    enum { COMMAND_TIMEOUT = 20000 };
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    QByteArray m_pendingConsoleStreamOutput;
    QByteArray m_pendingLogStreamOutput;
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    // contains the first token number for the current round
    // of evaluation. Responses with older tokens are considers
    // out of date and discarded.
    int m_oldestAcceptableToken;
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    int m_pendingRequests; // Watch updating commands in flight
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    typedef void (GdbEngine::*CommandsDoneCallback)();
    // function called after all previous responses have been received
    CommandsDoneCallback m_commandsDoneCallback;
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    QList<GdbCommand> m_commandsToRunOnTemporaryBreak;

private: ////////// Gdb Output, State & Capability Handling //////////
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    void handleResponse(const QByteArray &buff);
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    void handleStopResponse(const GdbMi &data);
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    void handleResultRecord(GdbResponse *response);
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    void handleStop1(const GdbResponse &response);
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    void handleStop1(const GdbMi &data);
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    StackFrame parseStackFrame(const GdbMi &mi, int level);

    virtual bool isSynchroneous() const;
    bool supportsThreads() const;

    // Gdb initialization sequence
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    void handleShowVersion(const GdbResponse &response);
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    void handleIsSynchroneous(const GdbResponse &response);
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    int m_gdbVersion; // 6.8.0 is 60800
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    int m_gdbBuildVersion; // MAC only?
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    bool m_isMacGdb;
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    bool m_isSynchroneous; // Can act synchroneously?
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private: ////////// Inferior Management //////////
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    // This should be always the last call in a function.
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    Q_SLOT virtual void attemptBreakpointSynchronization();
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    virtual void stepExec();
    virtual void stepOutExec();
    virtual void nextExec();
    virtual void stepIExec();
    virtual void nextIExec();
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    void continueInferiorInternal();
    void autoContinueInferior();
    virtual void continueInferior();
    virtual void interruptInferior();
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    void interruptInferiorTemporarily();
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    virtual void runToLineExec(const QString &fileName, int lineNumber);
    virtual void runToFunctionExec(const QString &functionName);
//    void handleExecRunToFunction(const GdbResponse &response);
    virtual void jumpToLineExec(const QString &fileName, int lineNumber);
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    void handleExecContinue(const GdbResponse &response);
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    qint64 inferiorPid() const { return m_manager->inferiorPid(); }
    void handleInferiorPidChanged(qint64 pid) { manager()->notifyInferiorPidChanged(pid); }
    void maybeHandleInferiorPidChanged(const QString &pid);
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#ifdef Q_OS_LINUX
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    void handleInfoProc(const GdbResponse &response);

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    QByteArray m_entryPoint;
#endif

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private: ////////// View & Data Stuff //////////

    virtual void selectThread(int index);
    virtual void activateFrame(int index);

    void gotoLocation(const StackFrame &frame, bool setLocationMarker);
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    //
    // Breakpoint specific stuff
    //
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    void handleBreakList(const GdbResponse &response);
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    void handleBreakList(const GdbMi &table);
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    void handleBreakIgnore(const GdbResponse &response);
    void handleBreakInsert(const GdbResponse &response);
    void handleBreakInsert1(const GdbResponse &response);
    void handleBreakCondition(const GdbResponse &response);
    void handleBreakInfo(const GdbResponse &response);
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    void extractDataFromInfoBreak(const QString &output, BreakpointData *data);
    void breakpointDataFromOutput(BreakpointData *data, const GdbMi &bkpt);
    void sendInsertBreakpoint(int index);
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    QString breakLocation(const QString &file) const;
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    //
    // Modules specific stuff
    //
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    virtual void loadSymbols(const QString &moduleName);
    virtual void loadAllSymbols();
    virtual QList<Symbol> moduleSymbols(const QString &moduleName);
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    virtual void reloadModules();
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    void reloadModulesInternal();
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    void handleModulesList(const GdbResponse &response);
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    bool m_modulesListOutdated;
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    //
    // Register specific stuff
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    //
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    Q_SLOT virtual void reloadRegisters();
    virtual void setRegisterValue(int nr, const QString &value);
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    void handleRegisterListNames(const GdbResponse &response);
    void handleRegisterListValues(const GdbResponse &response);
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    //
    // Disassembler specific stuff
    //
    virtual void fetchDisassembler(DisassemblerViewAgent *agent,
        const StackFrame &frame);
    void fetchDisassemblerByAddress(DisassemblerViewAgent *agent,
        bool useMixedMode);
    void handleFetchDisassemblerByLine(const GdbResponse &response);
    void handleFetchDisassemblerByAddress1(const GdbResponse &response);
    void handleFetchDisassemblerByAddress0(const GdbResponse &response);
    QString parseDisassembler(const GdbMi &lines);

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    //
    // Source file specific stuff
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    //
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    virtual void reloadSourceFiles();
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    void reloadSourceFilesInternal();
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    void handleQuerySources(const GdbResponse &response);

    QString fullName(const QString &fileName);
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#ifdef Q_OS_WIN
    QString cleanupFullName(const QString &fileName);
#else
    QString cleanupFullName(const QString &fileName) { return fileName; }
#endif
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    // awful hack to keep track of used files
    QMap<QString, QString> m_shortToFullName;
    QMap<QString, QString> m_fullToShortName;
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    bool m_sourcesListOutdated;
    bool m_sourcesListUpdating;

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    //
    // Stack specific stuff
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    //
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    void updateAll();
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    void handleStackListFrames(const GdbResponse &response);
    void handleStackSelectThread(const GdbResponse &response);
    void handleStackListThreads(const GdbResponse &response);
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    void handleStackFrame(const GdbResponse &response);
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    Q_SLOT void reloadStack(bool forceGotoLocation);
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    Q_SLOT virtual void reloadFullStack();
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    int currentFrame() const;
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    QList<GdbMi> m_currentFunctionArgs;
    QString m_currentFrame;
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    //
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    // Watch specific stuff
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    //
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    virtual void setToolTipExpression(const QPoint &mousePos, TextEditor::ITextEditor *editor, int cursorPos);
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    virtual void assignValueInDebugger(const QString &expr, const QString &value);

    virtual void fetchMemory(MemoryViewAgent *agent, quint64 addr, quint64 length);
    void handleFetchMemory(const GdbResponse &response);

    virtual void watchPoint(const QPoint &);
    void handleWatchPoint(const GdbResponse &response);
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    // FIXME: BaseClass. called to improve situation for a watch item
    void updateSubItem(const WatchData &data);
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    void handleChildren(const WatchData &parent, const GdbMi &child,
        QList<WatchData> *insertions);
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    void virtual updateWatchData(const WatchData &data);
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    Q_SLOT void updateWatchDataHelper(const WatchData &data);
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    void rebuildModel();
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    bool showToolTip();
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    void insertData(const WatchData &data);
    void sendWatchParameters(const QByteArray &params0);
    void createGdbVariable(const WatchData &data);

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    void runDebuggingHelper(const WatchData &data, bool dumpChildren);
    void runDirectDebuggingHelper(const WatchData &data, bool dumpChildren);
    bool hasDebuggingHelperForType(const QString &type) const;
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    void handleVarListChildren(const GdbResponse &response);
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    void handleVarListChildrenHelper(const GdbMi &child,
        const WatchData &parent);
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    void handleVarCreate(const GdbResponse &response);
    void handleVarAssign(const GdbResponse &response);
    void handleEvaluateExpression(const GdbResponse &response);
    //void handleToolTip(const GdbResponse &response);
    void handleQueryDebuggingHelper(const GdbResponse &response);
    void handleDebuggingHelperValue2(const GdbResponse &response);
    void handleDebuggingHelperValue3(const GdbResponse &response);
    void handleDebuggingHelperEditValue(const GdbResponse &response);
    void handleDebuggingHelperSetup(const GdbResponse &response);
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    void updateLocals(const QVariant &cookie = QVariant());
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    void handleStackListLocals(const GdbResponse &response);
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    WatchData localVariable(const GdbMi &item,
                            const QStringList &uninitializedVariables,
                            QMap<QByteArray, int> *seen);
    void setLocals(const QList<GdbMi> &locals);
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    void handleStackListArguments(const GdbResponse &response);
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    void setWatchDataType(WatchData &data, const GdbMi &mi);
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    void setWatchDataDisplayedType(WatchData &data, const GdbMi &mi);
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    QSet<QString> m_processedNames;
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    QMap<QString, QString> m_varToType;

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private: ////////// Dumper Management //////////
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    QString qtDumperLibraryName() const;
    bool checkDebuggingHelpers();
    void setDebuggingHelperState(DebuggingHelperState);
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    void tryLoadDebuggingHelpers();
    void tryQueryDebuggingHelpers();
    Q_SLOT void recheckDebuggingHelperAvailability();
    void connectDebuggingHelperActions();
    void disconnectDebuggingHelperActions();
    Q_SLOT void setDebugDebuggingHelpers(const QVariant &on);
    Q_SLOT void setUseDebuggingHelpers(const QVariant &on);
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    const bool m_dumperInjectionLoad;
    DebuggingHelperState m_debuggingHelperState;
    QtDumperHelper m_dumperHelper;
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private: ////////// Convenience Functions //////////
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    QString errorMessage(QProcess::ProcessError error);
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    void showMessageBox(int icon, const QString &title, const QString &text);
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    void debugMessage(const QString &msg);
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    QMainWindow *mainWindow() const;
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};

} // namespace Internal
} // namespace Debugger

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Q_DECLARE_OPERATORS_FOR_FLAGS(Debugger::Internal::GdbEngine::GdbCommandFlags)

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#endif // DEBUGGER_GDBENGINE_H