gdbengine.cpp 153 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 "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 "gdbmi.h"
#include "procinterrupt.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 <texteditor/itexteditor.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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using namespace Debugger::Constants;

//#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 STRINGIFY_INTERNAL(x) #x
#define STRINGIFY(x) STRINGIFY_INTERNAL(x)
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#define CB(callback) &GdbEngine::callback, STRINGIFY(callback)

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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
static bool parseConsoleStream(const GdbResultRecord &record, GdbMi *contents)
{
    GdbMi output = record.data.findChild("consolestreamoutput");
    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();
}

static QByteArray parsePlainConsoleStream(const GdbResultRecord &record)
{
    GdbMi output = record.data.findChild("consolestreamoutput");
    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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///////////////////////////////////////////////////////////////////////
//
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// PlainGdbAdapter
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//
///////////////////////////////////////////////////////////////////////

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void PlainGdbAdapter::attach(GdbEngine *engine) const
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{
    QFileInfo fi(engine->startParameters().executable);
    QString fileName = fi.absoluteFilePath();
    engine->postCommand(_("-file-exec-and-symbols ") + fileName,
        &GdbEngine::handleFileExecAndSymbols, "handleFileExecAndSymbols");
}

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

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GdbEngine::GdbEngine(DebuggerManager *parent, AbstractGdbAdapter *gdbAdapter) :
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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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    q(parent),
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    qq(parent->engineInterface())
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{
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    m_gdbAdapter = gdbAdapter;
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    m_stubProc.setMode(Core::Utils::ConsoleProcess::Debug);
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#ifdef Q_OS_UNIX
    m_stubProc.setSettings(Core::ICore::instance()->settings());
#endif
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    initializeVariables();
    initializeConnections();
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}

GdbEngine::~GdbEngine()
{
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    // prevent sending error messages afterwards
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    m_gdbAdapter->disconnect(this);
    delete m_gdbAdapter;
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}

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void GdbEngine::initializeConnections()
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{
    // Gdb Process interaction
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    connect(m_gdbAdapter, SIGNAL(error(QProcess::ProcessError)),
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        this, SLOT(gdbProcError(QProcess::ProcessError)));
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    connect(m_gdbAdapter, SIGNAL(readyReadStandardOutput()),
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        this, SLOT(readGdbStandardOutput()));
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    connect(m_gdbAdapter, SIGNAL(readyReadStandardError()),
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        this, SLOT(readGdbStandardError()));
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    connect(m_gdbAdapter, SIGNAL(finished(int, QProcess::ExitStatus)),
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        q, SLOT(exitDebugger()));
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    connect(m_gdbAdapter, SIGNAL(started()),
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        this, SLOT(startDebugger2()));
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    connect(&m_stubProc, SIGNAL(processError(QString)),
        this, SLOT(stubError(QString)));
    connect(&m_stubProc, SIGNAL(processStarted()),
        this, SLOT(stubStarted()));
    connect(&m_stubProc, SIGNAL(wrapperStopped()),
        q, SLOT(exitDebugger()));

    connect(&m_uploadProc, SIGNAL(error(QProcess::ProcessError)),
        this, SLOT(uploadProcError(QProcess::ProcessError)));
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    connect(&m_uploadProc, SIGNAL(readyReadStandardOutput()),
        this, SLOT(readUploadStandardOutput()));
    connect(&m_uploadProc, SIGNAL(readyReadStandardError()),
        this, SLOT(readUploadStandardError()));
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    // Output
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    connect(&m_outputCollector, SIGNAL(byteDelivery(QByteArray)),
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        this, SLOT(readDebugeeOutput(QByteArray)));
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    connect(this, SIGNAL(gdbOutputAvailable(int,QString)),
        q, SLOT(showDebuggerOutput(int,QString)),
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        Qt::QueuedConnection);
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    connect(this, SIGNAL(gdbInputAvailable(int,QString)),
        q, SLOT(showDebuggerInput(int,QString)),
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        Qt::QueuedConnection);
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    connect(this, SIGNAL(applicationOutputAvailable(QString)),
        q, SLOT(showApplicationOutput(QString)),
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        Qt::QueuedConnection);
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    // FIXME: These trigger even if the engine is not active
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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::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_fullToShortName.clear();
    m_shortToFullName.clear();
    m_varToType.clear();

    m_modulesListOutdated = true;
    m_oldestAcceptableToken = -1;
    m_outputCodec = QTextCodec::codecForLocale();
    m_pendingRequests = 0;
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    m_autoContinue = false;
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    m_waitingForFirstBreakpointToBeHit = false;
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    m_commandsToRunOnTemporaryBreak.clear();
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    m_cookieForToken.clear();
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    m_customOutputForToken.clear();

    m_pendingConsoleStreamOutput.clear();
    m_pendingTargetStreamOutput.clear();
    m_pendingLogStreamOutput.clear();

    m_inbuffer.clear();

    m_currentFunctionArgs.clear();
    m_currentFrame.clear();
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    m_dumperHelper.clear();
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    // FIXME: unhandled:
    //m_outputCodecState = QTextCodec::ConverterState();
    //OutputCollector m_outputCollector;
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    //QProcess m_gdbAdapter;
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    //QProcess m_uploadProc;
    //Core::Utils::ConsoleProcess m_stubProc;
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}

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void GdbEngine::gdbProcError(QProcess::ProcessError error)
{
    QString msg;
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    bool kill = true;
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    switch (error) {
        case QProcess::FailedToStart:
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            kill = false;
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            msg = 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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            emitStartFailed();
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            break;
        case QProcess::Crashed:
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            kill = false;
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            msg = tr("The Gdb process crashed some time after starting "
                "successfully.");
            break;
        case QProcess::Timedout:
            msg = tr("The last waitFor...() function timed out. "
                "The state of QProcess is unchanged, and you can try calling "
                "waitFor...() again.");
            break;
        case QProcess::WriteError:
            msg = tr("An error occurred when attempting to write "
                "to the Gdb process. For example, the process may not be running, "
                "or it may have closed its input channel.");
            break;
        case QProcess::ReadError:
            msg = tr("An error occurred when attempting to read from "
                "the Gdb process. For example, the process may not be running.");
            break;
        default:
            msg = tr("An unknown error in the Gdb process occurred. "
                "This is the default return value of error().");
    }

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    q->showStatusMessage(msg);
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    QMessageBox::critical(q->mainWindow(), tr("Error"), msg);
    // act as if it was closed by the core
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    if (kill)
        q->exitDebugger();
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}

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

    q->showStatusMessage(msg);
    QMessageBox::critical(q->mainWindow(), tr("Error"), msg);
}

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void GdbEngine::readUploadStandardOutput()
{
    QByteArray ba = m_uploadProc.readAllStandardOutput();
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    gdbOutputAvailable(LogOutput, QString::fromLocal8Bit(ba, ba.length()));
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}

void GdbEngine::readUploadStandardError()
{
    QByteArray ba = m_uploadProc.readAllStandardError();
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    gdbOutputAvailable(LogError, QString::fromLocal8Bit(ba, ba.length()));
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}

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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)
{
    emit applicationOutputAvailable(m_outputCodec->toUnicode(
            data.constData(), data.length(), &m_outputCodecState));
}

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void GdbEngine::debugMessage(const QString &msg)
{
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    emit 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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        emit gdbOutputAvailable(LogTime, currentTime());
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    emit 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 record
    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 record;
            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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                    record.m_type = GdbMi::Tuple;
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                    break;
                }
                ++from; // skip ','
                data.parseResultOrValue(from, to);
                if (data.isValid()) {
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                    //qDebug() << "parsed response:" << data.toString();
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                    record.m_children += data;
                    record.m_type = GdbMi::Tuple;
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                }
            }
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            if (asyncClass == "stopped") {
                handleAsyncOutput(record);
            } 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 = record.findChild("id").data();
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                if (!id.isEmpty())
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                    q->showStatusMessage(tr("Library %1 loaded.").arg(_(id)));
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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 = record.findChild("id").data();
                q->showStatusMessage(tr("Library %1 unloaded.").arg(_(id)));
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            } else if (asyncClass == "thread-group-created") {
                // Archer has "{id="28902"}" 
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                QByteArray id = record.findChild("id").data();
                q->showStatusMessage(tr("Thread group %1 created.").arg(_(id)));
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            } else if (asyncClass == "thread-created") {
                //"{id="1",group-id="28902"}" 
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                QByteArray id = record.findChild("id").data();
                q->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 = record.findChild("id").data();
                q->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 = record.findChild("id").data();
                QByteArray groupid = record.findChild("group-id").data();
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                q->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 = record.findChild("id").data();
                q->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
            } 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=""}}
            #endif
            } else {
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                qDebug() << "IGNORED ASYNC OUTPUT"
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                    << asyncClass << record.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;
            if (data.startsWith("Reading symbols from ")) {
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                q->showStatusMessage(tr("Reading %1...").arg(_(data.mid(21))));
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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_pendingTargetStreamOutput += data;
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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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                qq->showApplicationOutput(_(data.mid(9))); // cut "warning: "
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            break;
        }

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        case '^': {
            GdbResultRecord record;
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            record.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")
                record.resultClass = GdbResultDone;
            else if (resultClass == "running")
                record.resultClass = GdbResultRunning;
            else if (resultClass == "connected")
                record.resultClass = GdbResultConnected;
            else if (resultClass == "error")
                record.resultClass = GdbResultError;
            else if (resultClass == "exit")
                record.resultClass = GdbResultExit;
            else
                record.resultClass = GdbResultUnknown;
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            from = inner;
            if (from != to) {
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                if (*from == ',') {
                    ++from;
                    record.data.parseTuple_helper(from, to);
                    record.data.m_type = GdbMi::Tuple;
                    record.data.m_name = "data";
                } else {
                    // Archer has this
                    record.data.m_type = GdbMi::Tuple;
                    record.data.m_name = "data";
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                }
            }
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            //qDebug() << "\nLOG STREAM:" + m_pendingLogStreamOutput;
            //qDebug() << "\nTARGET STREAM:" + m_pendingTargetStreamOutput;
            //qDebug() << "\nCONSOLE STREAM:" + m_pendingConsoleStreamOutput;
            record.data.setStreamOutput("logstreamoutput",
                m_pendingLogStreamOutput);
            record.data.setStreamOutput("targetstreamoutput",
                m_pendingTargetStreamOutput);
            record.data.setStreamOutput("consolestreamoutput",
                m_pendingConsoleStreamOutput);
            QByteArray custom = m_customOutputForToken[token];
            if (!custom.isEmpty())
                record.data.setStreamOutput("customvaluecontents",
                    '{' + custom + '}');
            //m_customOutputForToken.remove(token);
            m_pendingLogStreamOutput.clear();
            m_pendingTargetStreamOutput.clear();
            m_pendingConsoleStreamOutput.clear();

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

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void GdbEngine::handleStubAttached(const GdbResultRecord &, const QVariant &)
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{
    qq->notifyInferiorStopped();
    handleAqcuiredInferior();
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    m_autoContinue = true;
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}

void GdbEngine::stubStarted()
{
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    const qint64 attachedPID = m_stubProc.applicationPID();
    qq->notifyInferiorPidChanged(attachedPID);
    postCommand(_("attach %1").arg(attachedPID), CB(handleStubAttached));
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}

void GdbEngine::stubError(const QString &msg)
{
    QMessageBox::critical(q->mainWindow(), tr("Debugger Error"), msg);
}

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void GdbEngine::readGdbStandardError()
{
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    qWarning() << "Unexpected gdb stderr:" << m_gdbAdapter->readAllStandardError();
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}

void GdbEngine::readGdbStandardOutput()
{
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    int newstart = 0;
    int scan = m_inbuffer.size();
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    m_inbuffer.append(m_gdbAdapter->readAllStandardOutput());
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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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        handleResponse(QByteArray::fromRawData(m_inbuffer.constData() + start, end - start));
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    }
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    m_inbuffer.clear();
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}

void GdbEngine::interruptInferior()
{
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    qq->notifyInferiorStopRequested();
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    if (m_gdbAdapter->state() == QProcess::NotRunning) {
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        debugMessage(_("TRYING TO INTERRUPT INFERIOR WITHOUT RUNNING GDB"));
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        qq->notifyInferiorExited();
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        return;
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    }
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    if (q->startMode() == StartRemote) {
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        postCommand(_("-exec-interrupt"));
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        return;
    }

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    const qint64 attachedPID = q->inferiorPid();
    if (attachedPID <= 0) {
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        debugMessage(_("TRYING TO INTERRUPT INFERIOR BEFORE PID WAS OBTAINED"));
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        return;
    }

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    if (!interruptProcess(attachedPID))
        debugMessage(_("CANNOT INTERRUPT %1").arg(attachedPID));
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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 == q->inferiorPid())
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        return;
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    debugMessage(_("FOUND PID %1").arg(pid));    

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    qq->notifyInferiorPidChanged(pid);
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    if (m_dumperInjectionLoad)
        tryLoadDebuggingHelpers();
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}

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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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{
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    if (m_gdbAdapter->state() == QProcess::NotRunning) {
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        debugMessage(_("NO GDB PROCESS RUNNING, CMD IGNORED: ") + command);
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        return;
    }

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    if (flags & RebuildModel) {
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        ++m_pendingRequests;
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        PENDING_DEBUG("   CALLBACK" << callbackName << "INCREMENTS PENDING TO:"
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            << m_pendingRequests << command);
    } else {
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        PENDING_DEBUG("   UNKNOWN CALLBACK" << callbackName << "LEAVES PENDING AT:"
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            << m_pendingRequests << command);
    }

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    GdbCommand cmd;
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    cmd.command = command;
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    cmd.flags = flags;
    cmd.callback = callback;
    cmd.callbackName = callbackName;
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    cmd.cookie = cookie;

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    if ((flags & NeedsStop) && q->status() != DebuggerInferiorStopped
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            && q->status() != DebuggerProcessStartingUp) {
        // queue the commands that we cannot send at once
        QTC_ASSERT(q->status() == DebuggerInferiorRunning,
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            qDebug() << "STATUS:" << q->status());
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        q->showStatusMessage(tr("Stopping temporarily."));
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        debugMessage(_("QUEUING COMMAND ") + cmd.command);
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        m_commandsToRunOnTemporaryBreak.append(cmd);
        interruptInferior();
    } else if (!command.isEmpty()) {
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        flushCommand(cmd);
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    }
}

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void GdbEngine::flushCommand(GdbCommand &cmd)
{
    ++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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    emit gdbInputAvailable(LogInput, cmd.command);
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    executeDebuggerCommand(cmd.command);
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}

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void GdbEngine::handleResultRecord(const GdbResultRecord &record)
{
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    //qDebug() << "TOKEN:" << record.token
    //    << " ACCEPTABLE:" << m_oldestAcceptableToken;
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    //qDebug() << "";
    //qDebug() << "\nRESULT" << record.token << record.toString();

    int token = record.token;
    if (token == -1)
        return;

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    if (!m_cookieForToken.contains(token)) {
        // In theory this should not happen, in practice it does.
        debugMessage(_("COOKIE FOR TOKEN %1 ALREADY EATEN. "
            "TWO RESPONSES FOR ONE COMMAND?").arg(token));
        // 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"
        if (record.resultClass == GdbResultError) {
            QByteArray msg = record.data.findChild("msg").data();
            QMessageBox::critical(q->mainWindow(), tr("Error"),
                tr("Executable failed:\n") + QString::fromLocal8Bit(msg));
            q->showStatusMessage(tr("Process failed to start."));
            exitDebugger();
            //qq->notifyInferiorStopped();
            //qq->notifyInferiorExited();
        }
        return;
    }

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    GdbCommand cmd = m_cookieForToken.take(token);
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    if (theDebuggerBoolSetting(LogTimeStamps)) {
        emit gdbOutputAvailable(LogTime, _("Response time: %1: %2 s")
            .arg(cmd.command)
            .arg(cmd.postTime.msecsTo(QTime::currentTime()) / 1000.));
    }
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    if (record.token < m_oldestAcceptableToken && (cmd.flags & Discardable)) {
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        //qDebug() << "### SKIPPING OLD RESULT" << record.toString();
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        //QMessageBox::information(q->mainWindow(), tr("Skipped"), "xxx");
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        return;
    }

#if 0
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    qDebug() << "# handleOutput,"
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        << "cmd name:" << cmd.callbackName
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        << " cmd synchronized:" << cmd.synchronized
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        << "\n record: " << record.toString();
#endif

    // << "\n data: " << record.data.toString(true);

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    if (cmd.callback)
        (this->*(cmd.callback))(record, cmd.cookie);
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    if (cmd.flags & RebuildModel) {
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        --m_pendingRequests;
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        PENDING_DEBUG("   TYPE " << cmd.callbackName << " DECREMENTS PENDING TO: "
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            << m_pendingRequests << cmd.command);
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        if (m_pendingRequests <= 0) {
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            PENDING_DEBUG("\n\n ....  AND TRIGGERS MODEL UPDATE\n");
            rebuildModel();
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        }
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    } else {
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        PENDING_DEBUG("   UNKNOWN TYPE " << cmd.callbackName << " LEAVES PENDING AT: "
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            << m_pendingRequests << cmd.command);
    }
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    // This is somewhat inefficient, as it makes the last command synchronous.
    // An optimization would be requesting the continue immediately when the
    // event loop is entered, and let individual commands have a flag to suppress
    // that behavior.
    if (m_cookieForToken.isEmpty() && m_autoContinue) {
        m_autoContinue = false;
        continueInferior();
        q->showStatusMessage(tr("Continuing after temporary stop."));
    }
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}

void GdbEngine::executeDebuggerCommand(const QString &command)
{
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    if (m_gdbAdapter->state() != QProcess::Running) {
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        debugMessage(_("GDB PROCESS NOT RUNNING, PLAIN CMD IGNORED: ") + command);
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        return;
    }

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    m_gdbAdapter->write(command.toLatin1() + "\r\n");
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}

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void GdbEngine::handleTargetCore(const GdbResultRecord &, const QVariant &)
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{
    qq->notifyInferiorStopped();
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    q->showStatusMessage(tr("Core file loaded."));
    q->resetLocation();
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    tryLoadDebuggingHelpers();
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    qq->stackHandler()->setCurrentIndex(0);
    updateLocals(); // Quick shot
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    reloadStack();
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    if (supportsThreads())
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        postCommand(_("-thread-list-ids"), WatchUpdate, CB(handleStackListThreads), 0);
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    qq->reloadRegisters();
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}

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void GdbEngine::handleQuerySources(const GdbResultRecord &record, const QVariant &)
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{
    if (record.resultClass == GdbResultDone) {
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        QMap<QString, QString> oldShortToFull = m_shortToFullName;
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        m_shortToFullName.clear();
        m_fullToShortName.clear();
        // "^done,files=[{file="../../../../bin/gdbmacros/gdbmacros.cpp",
        // fullname="/data5/dev/ide/main/bin/gdbmacros/gdbmacros.cpp"},
        GdbMi files = record.data.findChild("files");
        foreach (const GdbMi &item, files.children()) {
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            QString fileName = QString::fromLocal8Bit(item.findChild("file").data());
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            GdbMi fullName = item.findChild("fullname");
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            QString full = QString::fromLocal8Bit(fullName.data());
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            #ifdef Q_OS_WIN
            full = QDir::cleanPath(full);
            #endif
            if (fullName.isValid() && QFileInfo(full).isReadable()) {
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                //qDebug() << "STORING 2:" << fileName << full;
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                m_shortToFullName[fileName] = full;
                m_fullToShortName[full] = fileName;
            }
        }
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        if (m_shortToFullName != oldShortToFull)
            qq->sourceFileWindow()->setSourceFiles(m_shortToFullName);
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    }
}

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void GdbEngine::handleInfoThreads(const GdbResultRecord &record, const QVariant &)
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{
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    if (record.resultClass != GdbResultDone)
        return;
    // FIXME: use something more robust
    // WIN:     [New thread 3380.0x2bc]
    //          * 3 Thread 2312.0x4d0  0x7c91120f in ?? ()
    // LINUX:   * 1 Thread 0x7f466273c6f0 (LWP 21455)  0x0000000000404542 in ...
    const QString data = _(record.data.findChild("consolestreamoutput").data());
    if (data.isEmpty())
        return;
    // check "[New thread 3380.0x2bc]"
    if (data.startsWith(QLatin1Char('['))) {
        QRegExp ren(_("^\\[New thread (\\d+)\\.0x.*"));
        Q_ASSERT(ren.isValid());
        if (ren.indexIn(data) != -1) {
            maybeHandleInferiorPidChanged(ren.cap(1));
            return;
        }
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    }
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    // check "* 3 Thread ..."
    QRegExp re(_("^\\*? +\\d+ +[Tt]hread (\\d+)\\.0x.* in"));
    Q_ASSERT(re.isValid());
    if (re.indexIn(data) != -1)
        maybeHandleInferiorPidChanged(re.cap(1));
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}

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void GdbEngine::handleInfoProc(const GdbResultRecord &record, const QVariant &)
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{
    if (record.resultClass == GdbResultDone) {
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        #ifdef Q_OS_MAC
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        //^done,process-id="85075"
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        maybeHandleInferiorPidChanged(_(record.data.findChild("process-id").data()));
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        #else
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        // FIXME: use something more robust
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        QRegExp re(__("process (\\d+)"));
        QString data = __(record.data.findChild("consolestreamoutput").data());
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        if (re.indexIn(data) != -1)
            maybeHandleInferiorPidChanged(re.cap(1));
        #endif
    }
}

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void GdbEngine::handleInfoShared(const GdbResultRecord &record, const QVariant &cookie)
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{
    if (record.resultClass == GdbResultDone) {
        // let the modules handler do the parsing
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        handleModulesList(record, cookie);
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    }
}

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#if 0
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void GdbEngine::handleExecJumpToLine(const GdbResultRecord &record)
{
    // FIXME: remove this special case as soon as 'jump'
    // is supported by MI
    // "&"jump /home/apoenitz/dev/work/test1/test1.cpp:242"
    // ~"Continuing at 0x4058f3."
    // ~"run1 (argc=1, argv=0x7fffb213a478) at test1.cpp:242"
    // ~"242\t x *= 2;"
    //109^done"
    qq->notifyInferiorStopped();
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    q->showStatusMessage(tr("Jumped. Stopped."));
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    QByteArray output = record.data.findChild("logstreamoutput").data();
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    if (output.isEmpty())