gdbengine.cpp 161 KB
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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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#define QT_NO_CAST_FROM_ASCII

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#include "gdbengine.h"
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#include "gdboptionspage.h"
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#include "trkoptions.h"
#include "trkoptionspage.h"
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#include "attachgdbadapter.h"
#include "coregdbadapter.h"
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#include "plaingdbadapter.h"
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#include "termgdbadapter.h"
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#include "remotegdbadapter.h"
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#include "trkgdbadapter.h"
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#include "watchutils.h"
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#include "debuggeractions.h"
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#include "debuggeragents.h"
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#include "debuggerconstants.h"
#include "debuggermanager.h"
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#include "debuggertooltip.h"
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#include "debuggerstringutils.h"
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#include "gdbmi.h"

#include "breakhandler.h"
#include "moduleshandler.h"
#include "registerhandler.h"
#include "stackhandler.h"
#include "watchhandler.h"
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#include "sourcefileswindow.h"
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#include "debuggerdialogs.h"
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#include <utils/qtcassert.h>
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#include <utils/fancymainwindow.h>
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#include <texteditor/itexteditor.h>
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#include <projectexplorer/toolchain.h>
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#include <coreplugin/icore.h>
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#include <QtCore/QDebug>
#include <QtCore/QDir>
#include <QtCore/QFileInfo>
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#include <QtCore/QMetaObject>
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#include <QtCore/QTime>
#include <QtCore/QTimer>
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#include <QtCore/QTextStream>
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#include <QtGui/QAction>
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#include <QtCore/QCoreApplication>
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#include <QtGui/QLabel>
#include <QtGui/QMainWindow>
#include <QtGui/QMessageBox>
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#include <QtGui/QDialogButtonBox>
#include <QtGui/QPushButton>
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#ifdef Q_OS_WIN
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#    include "shared/sharedlibraryinjector.h"
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#endif
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#ifdef Q_OS_UNIX
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#include <unistd.h>
#include <dlfcn.h>
#endif
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#include <ctype.h>
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namespace Debugger {
namespace Internal {
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//#define DEBUG_PENDING  1
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//#define DEBUG_SUBITEM  1
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#if DEBUG_PENDING
#   define PENDING_DEBUG(s) qDebug() << s
#else
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#   define PENDING_DEBUG(s)
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#endif
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#define PENDING_DEBUGX(s) qDebug() << s
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#define CB(callback) &GdbEngine::callback, STRINGIFY(callback)

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static bool stateAcceptsGdbCommands(DebuggerState state)
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{
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    switch (state) {
    case AdapterStarting:
    case AdapterStarted:
    case AdapterStartFailed:
    case InferiorUnrunnable:
    case InferiorStarting:
    case InferiorStartFailed:
    case InferiorRunningRequested:
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    case InferiorRunningRequested_Kill:
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    case InferiorRunning:
    case InferiorStopping:
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    case InferiorStopping_Kill:
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    case InferiorStopped:
    case InferiorShuttingDown:
    case InferiorShutDown:
    case InferiorShutdownFailed:
        return true;
    case DebuggerNotReady:
    case EngineStarting:
    case InferiorStopFailed:
    case EngineShuttingDown:
        break;
    }
    return false;
}
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static int &currentToken()
{
    static int token = 0;
    return token;
}

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// reads a MI-encoded item frome the consolestream
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static bool parseConsoleStream(const GdbResponse &response, GdbMi *contents)
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{
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    GdbMi output = response.data.findChild("consolestreamoutput");
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    QByteArray out = output.data();

    int markerPos = out.indexOf('"') + 1; // position of 'success marker'
    if (markerPos == 0 || out.at(markerPos) == 'f') {  // 't' or 'f'
        // custom dumper produced no output
        return false;
    }

    out = out.mid(markerPos +  1);
    out = out.left(out.lastIndexOf('"'));
    // optimization: dumper output never needs real C unquoting
    out.replace('\\', "");
    out = "dummy={" + out + "}";

    contents->fromString(out);
    //qDebug() << "CONTENTS" << contents->toString(true);
    return contents->isValid();
}

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static QByteArray parsePlainConsoleStream(const GdbResponse &response)
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{
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    GdbMi output = response.data.findChild("consolestreamoutput");
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    QByteArray out = output.data();
    // FIXME: proper decoding needed
    if (out.endsWith("\\n"))
        out.chop(2);
    while (out.endsWith('\n') || out.endsWith(' '))
        out.chop(1);
    int pos = out.indexOf(" = ");
    return out.mid(pos + 3);
}

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///////////////////////////////////////////////////////////////////////
//
// GdbEngine
//
///////////////////////////////////////////////////////////////////////

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GdbEngine::GdbEngine(DebuggerManager *manager) :
    IDebuggerEngine(manager),
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#ifdef Q_OS_WIN // Do injection loading with MinGW (call loading does not work with 64bit)
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    m_dumperInjectionLoad(true)
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#else
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    m_dumperInjectionLoad(false)
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#endif
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{
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    m_trkOptions = QSharedPointer<TrkOptions>(new TrkOptions);
    m_trkOptions->fromSettings(Core::ICore::instance()->settings());
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    m_gdbAdapter = 0;
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    m_commandTimer = new QTimer(this);
    m_commandTimer->setSingleShot(true);
    m_commandTimer->setInterval(COMMAND_TIMEOUT);
    connect(m_commandTimer, SIGNAL(timeout()), SLOT(commandTimeout()));

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    // Needs no resetting in initializeVariables()
    m_busy = false;

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    connect(theDebuggerAction(AutoDerefPointers), SIGNAL(valueChanged(QVariant)),
            this, SLOT(setAutoDerefPointers(QVariant)));
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}
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void GdbEngine::connectDebuggingHelperActions()
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{
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    connect(theDebuggerAction(UseDebuggingHelpers), SIGNAL(valueChanged(QVariant)),
            this, SLOT(setUseDebuggingHelpers(QVariant)));
    connect(theDebuggerAction(DebugDebuggingHelpers), SIGNAL(valueChanged(QVariant)),
            this, SLOT(setDebugDebuggingHelpers(QVariant)));
    connect(theDebuggerAction(RecheckDebuggingHelpers), SIGNAL(triggered()),
            this, SLOT(recheckDebuggingHelperAvailability()));
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}
   
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void GdbEngine::disconnectDebuggingHelperActions()
{
    disconnect(theDebuggerAction(UseDebuggingHelpers), 0, this, 0);
    disconnect(theDebuggerAction(DebugDebuggingHelpers), 0, this, 0);
    disconnect(theDebuggerAction(RecheckDebuggingHelpers), 0, this, 0);
}

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DebuggerStartMode GdbEngine::startMode() const
{
    QTC_ASSERT(!m_startParameters.isNull(), return NoStartMode);
    return m_startParameters->startMode;
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}

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QMainWindow *GdbEngine::mainWindow() const
{
    return m_manager->mainWindow();
}

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GdbEngine::~GdbEngine()
{
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    // prevent sending error messages afterwards
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    disconnect(&m_gdbProc, 0, this, 0);
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    delete m_gdbAdapter;
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    m_gdbAdapter = 0;
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}

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void GdbEngine::connectAdapter()
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{
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    connect(m_gdbAdapter, SIGNAL(adapterStarted()),
        this, SLOT(handleAdapterStarted()));
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    connect(m_gdbAdapter, SIGNAL(adapterStartFailed(QString,QString)),
        this, SLOT(handleAdapterStartFailed(QString,QString)));
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    connect(m_gdbAdapter, SIGNAL(inferiorPrepared()),
        this, SLOT(handleInferiorPrepared()));

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    connect(m_gdbAdapter, SIGNAL(inferiorStartFailed(QString)),
        this, SLOT(handleInferiorStartFailed(QString)));

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    connect(m_gdbAdapter, SIGNAL(adapterCrashed(QString)),
        this, SLOT(handleAdapterCrashed(QString)));
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}
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void GdbEngine::initializeVariables()
{
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    m_debuggingHelperState = DebuggingHelperUninitialized;
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    m_gdbVersion = 100;
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    m_gdbBuildVersion = -1;
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    m_isMacGdb = false;
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    m_isSynchroneous = false;
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    m_registerNamesListed = false;
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    m_fullToShortName.clear();
    m_shortToFullName.clear();
    m_varToType.clear();

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    m_modulesListOutdated = m_sourcesListOutdated = true;
    m_sourcesListUpdating = false;
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    m_oldestAcceptableToken = -1;
    m_outputCodec = QTextCodec::codecForLocale();
    m_pendingRequests = 0;
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    m_commandsDoneCallback = 0;
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    m_commandsToRunOnTemporaryBreak.clear();
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    m_cookieForToken.clear();
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    m_pendingConsoleStreamOutput.clear();
    m_pendingLogStreamOutput.clear();

    m_inbuffer.clear();

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    // ConverterState has no reset() function.
    m_outputCodecState.~ConverterState();
    new (&m_outputCodecState) QTextCodec::ConverterState();

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    m_currentFunctionArgs.clear();
    m_currentFrame.clear();
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    m_dumperHelper.clear();
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#ifdef Q_OS_LINUX
    m_entryPoint.clear();
#endif
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}

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QString GdbEngine::errorMessage(QProcess::ProcessError error)
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{
    switch (error) {
        case QProcess::FailedToStart:
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            return tr("The Gdb process failed to start. Either the "
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                "invoked program '%1' is missing, or you may have insufficient "
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                "permissions to invoke the program.")
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                .arg(theDebuggerStringSetting(GdbLocation));
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        case QProcess::Crashed:
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            return tr("The Gdb process crashed some time after starting "
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                "successfully.");
        case QProcess::Timedout:
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            return tr("The last waitFor...() function timed out. "
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                "The state of QProcess is unchanged, and you can try calling "
                "waitFor...() again.");
        case QProcess::WriteError:
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            return tr("An error occurred when attempting to write "
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                "to the Gdb process. For example, the process may not be running, "
                "or it may have closed its input channel.");
        case QProcess::ReadError:
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            return tr("An error occurred when attempting to read from "
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                "the Gdb process. For example, the process may not be running.");
        default:
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            return tr("An unknown error in the Gdb process occurred. ");
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    }
}

#if 0
static void dump(const char *first, const char *middle, const QString & to)
{
    QByteArray ba(first, middle - first);
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    Q_UNUSED(to)
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    // note that qDebug cuts off output after a certain size... (bug?)
    qDebug("\n>>>>> %s\n%s\n====\n%s\n<<<<<\n",
        qPrintable(currentTime()),
        qPrintable(QString(ba).trimmed()),
        qPrintable(to.trimmed()));
    //qDebug() << "";
    //qDebug() << qPrintable(currentTime())
    //    << " Reading response:  " << QString(ba).trimmed() << "\n";
}
#endif

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void GdbEngine::readDebugeeOutput(const QByteArray &data)
{
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    m_manager->showApplicationOutput(m_outputCodec->toUnicode(
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            data.constData(), data.length(), &m_outputCodecState));
}

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void GdbEngine::debugMessage(const QString &msg)
{
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    gdbOutputAvailable(LogDebug, msg);
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}

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void GdbEngine::handleResponse(const QByteArray &buff)
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{
    static QTime lastTime;

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    if (theDebuggerBoolSetting(LogTimeStamps))
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        gdbOutputAvailable(LogTime, currentTime());
    gdbOutputAvailable(LogOutput, QString::fromLocal8Bit(buff, buff.length()));
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#if 0
    qDebug() // << "#### start response handling #### "
        << currentTime()
        << lastTime.msecsTo(QTime::currentTime()) << "ms,"
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        << "buf:" << buff.left(1500) << "..."
        //<< "buf:" << buff
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        << "size:" << buff.size();
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#else
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    //qDebug() << "buf:" << buff;
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#endif

    lastTime = QTime::currentTime();

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    if (buff.isEmpty() || buff == "(gdb) ")
        return;
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    const char *from = buff.constData();
    const char *to = from + buff.size();
    const char *inner;
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    int token = -1;
    // token is a sequence of numbers
    for (inner = from; inner != to; ++inner)
        if (*inner < '0' || *inner > '9')
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            break;
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    if (from != inner) {
        token = QByteArray(from, inner - from).toInt();
        from = inner;
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        //qDebug() << "found token" << token;
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    }
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    // next char decides kind of response
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    const char c = *from++;
    //qDebug() << "CODE:" << c;
    switch (c) {
        case '*':
        case '+':
        case '=': {
            QByteArray asyncClass;
            for (; from != to; ++from) {
                const char c = *from;
                if (!isNameChar(c))
                    break;
                asyncClass += *from;
            }
            //qDebug() << "ASYNCCLASS" << asyncClass;
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            GdbMi result;
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            while (from != to) {
                GdbMi data;
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                if (*from != ',') {
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                    // happens on archer where we get 
                    // 23^running <NL> *running,thread-id="all" <NL> (gdb) 
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                    result.m_type = GdbMi::Tuple;
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                    break;
                }
                ++from; // skip ','
                data.parseResultOrValue(from, to);
                if (data.isValid()) {
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                    //qDebug() << "parsed result:" << data.toString();
                    result.m_children += data;
                    result.m_type = GdbMi::Tuple;
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                }
            }
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            if (asyncClass == "stopped") {
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                handleStopResponse(result);
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            } else if (asyncClass == "running") {
                // Archer has 'thread-id="all"' here
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            } else if (asyncClass == "library-loaded") {
                // Archer has 'id="/usr/lib/libdrm.so.2",
                // target-name="/usr/lib/libdrm.so.2",
                // host-name="/usr/lib/libdrm.so.2",
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                // symbols-loaded="0"
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                QByteArray id = result.findChild("id").data();
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                if (!id.isEmpty())
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                    showStatusMessage(tr("Library %1 loaded.").arg(_(id)));
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                m_modulesListOutdated = m_sourcesListOutdated = true;
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            } else if (asyncClass == "library-unloaded") {
                // Archer has 'id="/usr/lib/libdrm.so.2",
                // target-name="/usr/lib/libdrm.so.2",
                // host-name="/usr/lib/libdrm.so.2"
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                QByteArray id = result.findChild("id").data();
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                showStatusMessage(tr("Library %1 unloaded.").arg(_(id)));
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                m_modulesListOutdated = m_sourcesListOutdated = true;
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            } else if (asyncClass == "thread-group-created") {
                // Archer has "{id="28902"}" 
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                QByteArray id = result.findChild("id").data();
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                showStatusMessage(tr("Thread group %1 created.").arg(_(id)));
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                int pid = id.toInt();
                if (pid != inferiorPid())
                    handleInferiorPidChanged(pid);
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            } else if (asyncClass == "thread-created") {
                //"{id="1",group-id="28902"}" 
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                QByteArray id = result.findChild("id").data();
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                showStatusMessage(tr("Thread %1 created.").arg(_(id)));
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            } else if (asyncClass == "thread-group-exited") {
                // Archer has "{id="28902"}" 
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                QByteArray id = result.findChild("id").data();
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                showStatusMessage(tr("Thread group %1 exited.").arg(_(id)));
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            } else if (asyncClass == "thread-exited") {
                //"{id="1",group-id="28902"}" 
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                QByteArray id = result.findChild("id").data();
                QByteArray groupid = result.findChild("group-id").data();
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                showStatusMessage(tr("Thread %1 in group %2 exited.")
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                    .arg(_(id)).arg(_(groupid)));
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            } else if (asyncClass == "thread-selected") {
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                QByteArray id = result.findChild("id").data();
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                showStatusMessage(tr("Thread %1 selected.").arg(_(id)));
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                //"{id="2"}" 
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            #if defined(Q_OS_MAC)
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            } else if (asyncClass == "shlibs-updated") {
                // MAC announces updated libs
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                m_modulesListOutdated = m_sourcesListOutdated = true;
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            } else if (asyncClass == "shlibs-added") {
                // MAC announces added libs
                // {shlib-info={num="2", name="libmathCommon.A_debug.dylib",
                // kind="-", dyld-addr="0x7f000", reason="dyld", requested-state="Y",
                // state="Y", path="/usr/lib/system/libmathCommon.A_debug.dylib",
                // description="/usr/lib/system/libmathCommon.A_debug.dylib",
                // loaded_addr="0x7f000", slide="0x7f000", prefix=""}}
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                m_modulesListOutdated = m_sourcesListOutdated = true;
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            #endif
            } else {
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                qDebug() << "IGNORED ASYNC OUTPUT"
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                    << asyncClass << result.toString();
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            }
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            break;
        }
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        case '~': {
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            QByteArray data = GdbMi::parseCString(from, to);
            m_pendingConsoleStreamOutput += data;
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            // Parse pid from noise.
            if (!inferiorPid()) {
                // Linux/Mac gdb: [New [Tt]hread 0x545 (LWP 4554)]
                static QRegExp re1(_("New .hread 0x[0-9a-f]+ \\(LWP ([0-9]*)\\)"));
                // MinGW 6.8: [New thread 2437.0x435345]
                static QRegExp re2(_("New .hread ([0-9]+)\\.0x[0-9a-f]*"));
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                // Mac: [Switching to process 9294 local thread 0x2e03] or
                // [Switching to process 31773]
                static QRegExp re3(_("Switching to process ([0-9]+)"));
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                QTC_ASSERT(re1.isValid() && re2.isValid(), return);
                if (re1.indexIn(_(data)) != -1)
                    maybeHandleInferiorPidChanged(re1.cap(1));
                else if (re2.indexIn(_(data)) != -1)
                    maybeHandleInferiorPidChanged(re2.cap(1));
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                else if (re3.indexIn(_(data)) != -1)
                    maybeHandleInferiorPidChanged(re3.cap(1));
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            }
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            // Show some messages to give the impression something happens.
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            if (data.startsWith("Reading symbols from ")) {
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                showStatusMessage(tr("Reading %1...").arg(_(data.mid(21))), 1000);
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                m_modulesListOutdated = m_sourcesListOutdated = true;
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            } else if (data.startsWith("[New ") || data.startsWith("[Thread ")) {
                if (data.endsWith('\n'))
                    data.chop(1);
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                showStatusMessage(_(data), 1000);
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            }
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            break;
        }
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        case '@': {
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            readDebugeeOutput(GdbMi::parseCString(from, to));
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            break;
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        }

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        case '&': {
            QByteArray data = GdbMi::parseCString(from, to);
            m_pendingLogStreamOutput += data;
            // On Windows, the contents seem to depend on the debugger
            // version and/or OS version used.
            if (data.startsWith("warning:"))
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                manager()->showApplicationOutput(_(data.mid(9))); // cut "warning: "
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            break;
        }

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        case '^': {
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            GdbResponse response;
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            response.token = token;
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            for (inner = from; inner != to; ++inner)
                if (*inner < 'a' || *inner > 'z')
                    break;
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            QByteArray resultClass = QByteArray::fromRawData(from, inner - from);
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            if (resultClass == "done") {
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                response.resultClass = GdbResultDone;
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            } else if (resultClass == "running") {
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                if (state() == InferiorStopped) { // Result of manual command.
                    m_manager->resetLocation();
                    setTokenBarrier();
                    setState(InferiorRunningRequested);
                }
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                setState(InferiorRunning);
                showStatusMessage(tr("Running..."));
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                response.resultClass = GdbResultRunning;
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            } else if (resultClass == "connected") {
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                response.resultClass = GdbResultConnected;
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            } else if (resultClass == "error") {
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                response.resultClass = GdbResultError;
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            } else if (resultClass == "exit") {
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                response.resultClass = GdbResultExit;
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            } else {
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                response.resultClass = GdbResultUnknown;
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            }
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            from = inner;
            if (from != to) {
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                if (*from == ',') {
                    ++from;
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                    response.data.parseTuple_helper(from, to);
                    response.data.m_type = GdbMi::Tuple;
                    response.data.m_name = "data";
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                } else {
                    // Archer has this
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                    response.data.m_type = GdbMi::Tuple;
                    response.data.m_name = "data";
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                }
            }
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            //qDebug() << "\nLOG STREAM:" + m_pendingLogStreamOutput;
            //qDebug() << "\nCONSOLE STREAM:" + m_pendingConsoleStreamOutput;
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            response.data.setStreamOutput("logstreamoutput",
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                m_pendingLogStreamOutput);
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            response.data.setStreamOutput("consolestreamoutput",
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                m_pendingConsoleStreamOutput);
            m_pendingLogStreamOutput.clear();
            m_pendingConsoleStreamOutput.clear();

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            handleResultRecord(&response);
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            break;
        }
        default: {
            qDebug() << "UNKNOWN RESPONSE TYPE" << c;
            break;
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        }
    }
}

void GdbEngine::readGdbStandardError()
{
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    QByteArray err = m_gdbProc.readAllStandardError();
    if (err == "Undefined command: \"bb\".  Try \"help\".\n")
        return;
    qWarning() << "Unexpected gdb stderr:" << err;
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}

void GdbEngine::readGdbStandardOutput()
{
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    if (m_commandTimer->isActive())
        m_commandTimer->start(); // Retrigger

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    int newstart = 0;
    int scan = m_inbuffer.size();
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    m_inbuffer.append(m_gdbProc.readAllStandardOutput());
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    // This can trigger when a dialog starts a nested event loop
    if (m_busy)
        return;

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    while (newstart < m_inbuffer.size()) {
        int start = newstart;
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        int end = m_inbuffer.indexOf('\n', scan);
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        if (end < 0) {
            m_inbuffer.remove(0, start);
            return;
        }
        newstart = end + 1;
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        scan = newstart;
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        if (end == start)
            continue;
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        #if defined(Q_OS_WIN)
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        if (m_inbuffer.at(end - 1) == '\r') {
            --end;
            if (end == start)
                continue;
        }
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        #endif
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        m_busy = true;
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        handleResponse(QByteArray::fromRawData(m_inbuffer.constData() + start, end - start));
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        m_busy = false;
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    }
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    m_inbuffer.clear();
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}

void GdbEngine::interruptInferior()
{
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    QTC_ASSERT(state() == InferiorRunning, qDebug() << state(); return);
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    setState(InferiorStopping);
    showStatusMessage(tr("Stop requested..."), 5000);

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    debugMessage(_("TRYING TO INTERRUPT INFERIOR"));
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    m_gdbAdapter->interruptInferior();
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}

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void GdbEngine::interruptInferiorTemporarily()
{
    interruptInferior();
    foreach (const GdbCommand &cmd, m_commandsToRunOnTemporaryBreak)
        if (cmd.flags & LosesChild) {
            setState(InferiorStopping_Kill);
            break;
        }
}

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void GdbEngine::maybeHandleInferiorPidChanged(const QString &pid0)
{
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    const qint64 pid = pid0.toLongLong();
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    if (pid == 0) {
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        debugMessage(_("Cannot parse PID from %1").arg(pid0));
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        return;
    }
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    if (pid == inferiorPid())
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        return;
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    debugMessage(_("FOUND PID %1").arg(pid));    

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    handleInferiorPidChanged(pid);
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    if (m_dumperInjectionLoad)
        tryLoadDebuggingHelpers();
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}

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void GdbEngine::postCommand(const QString &command, AdapterCallback callback,
                            const char *callbackName, const QVariant &cookie)
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{
    postCommand(command, NoFlags, callback, callbackName, cookie);
}

void GdbEngine::postCommand(const QString &command, GdbCommandFlags flags,
                            AdapterCallback callback,
                            const char *callbackName, const QVariant &cookie)
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{
    GdbCommand cmd;
    cmd.command = command;
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    cmd.flags = flags;
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    cmd.adapterCallback = callback;
    cmd.callbackName = callbackName;
    cmd.cookie = cookie;
    postCommandHelper(cmd);
}

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void GdbEngine::postCommand(const QString &command, GdbCommandCallback callback,
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                            const char *callbackName, const QVariant &cookie)
{
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    postCommand(command, NoFlags, callback, callbackName, cookie);
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}

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void GdbEngine::postCommand(const QString &command, GdbCommandFlags flags,
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                            GdbCommandCallback callback, const char *callbackName,
                            const QVariant &cookie)
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{
    GdbCommand cmd;
    cmd.command = command;
    cmd.flags = flags;
    cmd.callback = callback;
    cmd.callbackName = callbackName;
    cmd.cookie = cookie;
    postCommandHelper(cmd);
}

void GdbEngine::postCommandHelper(const GdbCommand &cmd)
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{
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    if (!stateAcceptsGdbCommands(state())) {
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        PENDING_DEBUG(_("NO GDB PROCESS RUNNING, CMD IGNORED: ") + cmd.command);
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        debugMessage(_("NO GDB PROCESS RUNNING, CMD IGNORED: %1 %2")
            .arg(cmd.command).arg(state()));
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        return;
    }

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    if (cmd.flags & RebuildModel) {
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        ++m_pendingRequests;
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        PENDING_DEBUG("   MODEL:" << cmd.command << "=>" << cmd.callbackName
                      << "INCREMENTS PENDING TO" << m_pendingRequests);
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    } else {
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        PENDING_DEBUG("   OTHER (IN):" << cmd.command << "=>" << cmd.callbackName
                      << "LEAVES PENDING AT" << m_pendingRequests);
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    }

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    if ((cmd.flags & NeedsStop) || !m_commandsToRunOnTemporaryBreak.isEmpty()) {
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        if (state() == InferiorStopped
            || state() == InferiorStarting || state() == AdapterStarted) {
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            // Can be safely sent now.
            flushCommand(cmd);
        } else {
            // Queue the commands that we cannot send at once.
            debugMessage(_("QUEUING COMMAND ") + cmd.command);
            m_commandsToRunOnTemporaryBreak.append(cmd);
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            if (state() == InferiorStopping) {
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                if (cmd.flags & LosesChild)
                    setState(InferiorStopping_Kill);
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                debugMessage(_("CHILD ALREADY BEING INTERRUPTED"));
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            } else if (state() == InferiorStopping_Kill) {
                debugMessage(_("CHILD ALREADY BEING INTERRUPTED (KILL PENDING)"));
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            } else if (state() == InferiorRunningRequested) {
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                if (cmd.flags & LosesChild)
                    setState(InferiorRunningRequested_Kill);
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                debugMessage(_("RUNNING REQUESTED; POSTPONING INTERRUPT"));
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            } else if (state() == InferiorRunningRequested_Kill) {
                debugMessage(_("RUNNING REQUESTED; POSTPONING INTERRUPT (KILL PENDING)"));
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            } else if (state() == InferiorRunning) {
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                showStatusMessage(tr("Stopping temporarily."), 1000);
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                interruptInferiorTemporarily();
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            } else {
                qDebug() << "ATTEMPTING TO QUEUE COMMAND IN INAPPROPRIATE STATE" << state();
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            }
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        }
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    } else if (!cmd.command.isEmpty()) {
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        flushCommand(cmd);
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    }
}

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void GdbEngine::flushQueuedCommands()
{
    showStatusMessage(tr("Processing queued commands."), 1000);
    while (!m_commandsToRunOnTemporaryBreak.isEmpty()) {
        GdbCommand cmd = m_commandsToRunOnTemporaryBreak.takeFirst();
        debugMessage(_("RUNNING QUEUED COMMAND %1 %2")
            .arg(cmd.command).arg(_(cmd.callbackName)));
        flushCommand(cmd);
    }
}

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void GdbEngine::flushCommand(const GdbCommand &cmd0)
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{
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    GdbCommand cmd = cmd0;
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    if (state() == DebuggerNotReady) {
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        gdbInputAvailable(LogInput, cmd.command);
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        debugMessage(_("GDB PROCESS NOT RUNNING, PLAIN CMD IGNORED: ") + cmd.command);
        return;
    }

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    ++currentToken();
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    cmd.postTime = QTime::currentTime();
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    m_cookieForToken[currentToken()] = cmd;
    cmd.command = QString::number(currentToken()) + cmd.command;
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    if (cmd.flags & EmbedToken)
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        cmd.command = cmd.command.arg(currentToken());
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    gdbInputAvailable(LogInput, cmd.command);
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    m_gdbAdapter->write(cmd.command.toLatin1() + "\r\n");
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    m_commandTimer->start();

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    if (cmd.flags & LosesChild)
        setState(InferiorShuttingDown);
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}

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void GdbEngine::commandTimeout()
{
    // FIXME this needs a proper message box
    debugMessage(_("TIMED OUT WAITING FOR GDB REPLY. COMMANDS STILL IN PROGRESS:"));
    QList<int> keys = m_cookieForToken.keys();
    qSort(keys);
    foreach (int key, keys) {
        const GdbCommand &cmd = m_cookieForToken[key];
        debugMessage(_("  %1: %2 => %3").arg(key).arg(cmd.command).arg(_(cmd.callbackName)));
    }
    // This is an entirely undefined state, so we just pull the emergency brake.
    setState(EngineShuttingDown, true);
    m_gdbProc.kill();
}

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void GdbEngine::handleResultRecord(GdbResponse *response)
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{
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    //qDebug() << "TOKEN:" << response.token
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    //    << " ACCEPTABLE:" << m_oldestAcceptableToken;
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    //qDebug() << "\nRESULT" << response.token << response.toString();
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    int token = response->token;
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    if (token == -1)
        return;

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    if (!m_cookieForToken.contains(token)) {
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        // In theory this should not happen (rather the error should be
        // reported in the "first" response to the command) in practice it
        // does. We try to handle a few situations we are aware of gracefully.
        // Ideally, this code should not be present at all.
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        debugMessage(_("COOKIE FOR TOKEN %1 ALREADY EATEN. "
            "TWO RESPONSES FOR ONE COMMAND?").arg(token));
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        if (response->resultClass == GdbResultError) {
            QByteArray msg = response->data.findChild("msg").data();
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            if (msg == "Cannot find new threads: generic error") {
                // Handle a case known to occur on Linux/gdb 6.8 when debugging moc
                // with helpers enabled. In this case we get a second response with
                // msg="Cannot find new threads: generic error"
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                debugMessage(_("APPLYING WORKAROUND #1"));
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                showMessageBox(QMessageBox::Critical,
                    tr("Executable failed"), QString::fromLocal8Bit(msg));
                showStatusMessage(tr("Process failed to start."));
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                shutdown();
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            } else if (msg == "\"finish\" not meaningful in the outermost frame.") { 
                // Handle a case known to appear on gdb 6.4 symbianelf when
                // the stack is cut due to access to protected memory.
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                debugMessage(_("APPLYING WORKAROUND #2"));
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                setState(InferiorStopping);
                setState(