gdbengine.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** 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.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
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**************************************************************************/

#define QT_NO_CAST_FROM_ASCII

#include "gdbengine.h"
#include "gdboptionspage.h"
#include "trkoptions.h"
#include "trkoptionspage.h"
#include "plaingdbadapter.h"
#include "trkgdbadapter.h"

#include "watchutils.h"
#include "debuggeractions.h"
#include "debuggeragents.h"
#include "debuggerconstants.h"
#include "debuggermanager.h"
#include "debuggertooltip.h"
#include "gdbmi.h"
#include "procinterrupt.h"

#include "breakhandler.h"
#include "moduleshandler.h"
#include "registerhandler.h"
#include "stackhandler.h"
#include "watchhandler.h"
#include "sourcefileswindow.h"

#include "debuggerdialogs.h"

#include <utils/qtcassert.h>
#include <texteditor/itexteditor.h>
#include <coreplugin/icore.h>

#include <QtCore/QDebug>
#include <QtCore/QDir>
#include <QtCore/QFileInfo>
#include <QtCore/QMetaObject>
#include <QtCore/QTime>
#include <QtCore/QTimer>
#include <QtCore/QTextStream>

#include <QtGui/QAction>
#include <QtCore/QCoreApplication>
#include <QtGui/QLabel>
#include <QtGui/QMainWindow>
#include <QtGui/QMessageBox>
#include <QtGui/QDialogButtonBox>
#include <QtGui/QPushButton>
#ifdef Q_OS_WIN
#    include "shared/sharedlibraryinjector.h"
#endif

#ifdef Q_OS_UNIX
#include <unistd.h>
#include <dlfcn.h>
#endif
#include <ctype.h>

// FIXME: temporary hack to evalute tbreak based step-over behaviour
static QString lastFile;
static int lastLine;

namespace Debugger {
namespace Internal {

//#define DEBUG_PENDING  1
//#define DEBUG_SUBITEM  1

#if DEBUG_PENDING
#   define PENDING_DEBUG(s) qDebug() << s
#else
#   define PENDING_DEBUG(s)
#endif

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

static bool stateAcceptsGdbCommands(GdbAdapterState state)
{
    return state == AdapterStarted
        || state == InferiorPreparing
        || state == InferiorPrepared
        || state == InferiorStarting
        || state == InferiorStarted
        || state == InferiorShuttingDown
        || state == InferiorShutDown
        || state == AdapterShuttingDown;
};

static int &currentToken()
{
    static int token = 0;
    return token;
}

// 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);
}

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

GdbEngine::GdbEngine(DebuggerManager *parent) :
#ifdef Q_OS_WIN // Do injection loading with MinGW (call loading does not work with 64bit)
    m_dumperInjectionLoad(true),
#else
    m_dumperInjectionLoad(false),
#endif
    m_manager(parent),
    qq(parent->engineInterface())
{
    m_gdbAdapter = 0;
}

GdbEngine::~GdbEngine()
{
    // prevent sending error messages afterwards
    if (m_gdbAdapter) {
        m_gdbAdapter->disconnect(this);
        delete m_gdbAdapter;
        m_gdbAdapter = 0;
    }
}

void GdbEngine::setGdbAdapter(AbstractGdbAdapter *gdbAdapter)
{
    m_gdbAdapter = gdbAdapter;
    initializeVariables();
    initializeConnections();
}

void GdbEngine::initializeConnections()
{
    // Gdb Process interaction
    connect(m_gdbAdapter, SIGNAL(error(QProcess::ProcessError)),
        this, SLOT(gdbProcError(QProcess::ProcessError)));
    connect(m_gdbAdapter, SIGNAL(readyReadStandardOutput()),
        this, SLOT(readGdbStandardOutput()));
    connect(m_gdbAdapter, SIGNAL(readyReadStandardError()),
        this, SLOT(readGdbStandardError()));

    connect(m_gdbAdapter, SIGNAL(adapterStarted()),
        this, SLOT(handleAdapterStarted()));
    connect(m_gdbAdapter, SIGNAL(adapterStartFailed(QString)),
        this, SLOT(handleAdapterStartFailed(QString)));
    connect(m_gdbAdapter, SIGNAL(adapterShutDown()),
        this, SLOT(handleAdapterShutDown()));
    connect(m_gdbAdapter, SIGNAL(adapterShutdownFailed(QString)),
        this, SLOT(handleAdapterShutdownFailed(QString)));

    connect(m_gdbAdapter, SIGNAL(inferiorPrepared()),
        this, SLOT(handleInferiorPrepared()));
    connect(m_gdbAdapter, SIGNAL(inferiorPreparationFailed(QString)),
        this, SLOT(handleInferiorPreparationFailed(QString)));

    connect(m_gdbAdapter, SIGNAL(inferiorStarted()),
        this, SLOT(handleInferiorStarted()));
    connect(m_gdbAdapter, SIGNAL(inferiorStartFailed(QString)),
        this, SLOT(handleInferiorStartFailed(QString)));
    connect(m_gdbAdapter, SIGNAL(inferiorShutDown()),
        this, SLOT(handleInferiorShutDown()));
    connect(m_gdbAdapter, SIGNAL(inferiorShutdownFailed(QString)),
        this, SLOT(handleInferiorShutdownFailed(QString)));

    connect(m_gdbAdapter, SIGNAL(adapterCrashed()),
        m_manager, SLOT(exitDebugger()));

    connect(&m_uploadProc, SIGNAL(error(QProcess::ProcessError)),
        this, SLOT(uploadProcError(QProcess::ProcessError)));
    connect(&m_uploadProc, SIGNAL(readyReadStandardOutput()),
        this, SLOT(readUploadStandardOutput()));
    connect(&m_uploadProc, SIGNAL(readyReadStandardError()),
        this, SLOT(readUploadStandardError()));

    // Output
    connect(&m_outputCollector, SIGNAL(byteDelivery(QByteArray)),
        this, SLOT(readDebugeeOutput(QByteArray)));

    connect(this, SIGNAL(gdbOutputAvailable(int,QString)),
        m_manager, SLOT(showDebuggerOutput(int,QString)),
        Qt::QueuedConnection);
    connect(this, SIGNAL(gdbInputAvailable(int,QString)),
        m_manager, SLOT(showDebuggerInput(int,QString)),
        Qt::QueuedConnection);
    connect(this, SIGNAL(applicationOutputAvailable(QString)),
        m_manager, SLOT(showApplicationOutput(QString)),
        Qt::QueuedConnection);

    // FIXME: These trigger even if the engine is not active
    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()));
}

void GdbEngine::initializeVariables()
{
    m_debuggingHelperState = DebuggingHelperUninitialized;
    m_gdbVersion = 100;
    m_gdbBuildVersion = -1;

    m_fullToShortName.clear();
    m_shortToFullName.clear();
    m_varToType.clear();

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

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

    m_inbuffer.clear();

    m_currentFunctionArgs.clear();
    m_currentFrame.clear();
    m_dumperHelper.clear();

    // FIXME: unhandled:
    //m_outputCodecState = QTextCodec::ConverterState();
    //QProcess m_gdbAdapter;
    //QProcess m_uploadProc;
}

void GdbEngine::gdbProcError(QProcess::ProcessError error)
{
    QString msg;
    bool kill = true;
    switch (error) {
        case QProcess::FailedToStart:
            kill = false;
            msg = tr("The Gdb process failed to start. Either the "
                "invoked program '%1' is missing, or you may have insufficient "
                "permissions to invoke the program.")
                .arg(theDebuggerStringSetting(GdbLocation));
            emitStartFailed();
            break;
        case QProcess::Crashed:
            kill = false;
            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().");
    }

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

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().");
    }

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

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

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

#if 0
static void dump(const char *first, const char *middle, const QString & to)
{
    QByteArray ba(first, middle - first);
    Q_UNUSED(to)
    // 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

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

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

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

    if (theDebuggerBoolSetting(LogTimeStamps))
        emit gdbOutputAvailable(LogTime, currentTime());
    emit gdbOutputAvailable(LogOutput, QString::fromLocal8Bit(buff, buff.length()));

#if 0
    qDebug() // << "#### start response handling #### "
        << currentTime()
        << lastTime.msecsTo(QTime::currentTime()) << "ms,"
        << "buf:" << buff.left(1500) << "..."
        //<< "buf:" << buff
        << "size:" << buff.size();
#else
    //qDebug() << "buf:" << buff;
#endif

    lastTime = QTime::currentTime();

    if (buff.isEmpty() || buff == "(gdb) ")
        return;

    const char *from = buff.constData();
    const char *to = from + buff.size();
    const char *inner;

    int token = -1;
    // token is a sequence of numbers
    for (inner = from; inner != to; ++inner)
        if (*inner < '0' || *inner > '9')
            break;
    if (from != inner) {
        token = QByteArray(from, inner - from).toInt();
        from = inner;
        //qDebug() << "found token" << token;
    }

    // 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;

            GdbMi record;
            while (from != to) {
                GdbMi data;
                if (*from != ',') {
                    // happens on archer where we get 
                    // 23^running <NL> *running,thread-id="all" <NL> (gdb) 
                    record.m_type = GdbMi::Tuple;
                    break;
                }
                ++from; // skip ','
                data.parseResultOrValue(from, to);
                if (data.isValid()) {
                    //qDebug() << "parsed response:" << data.toString();
                    record.m_children += data;
                    record.m_type = GdbMi::Tuple;
                }
            }
            if (asyncClass == "stopped") {
                handleAsyncOutput(record);
            } else if (asyncClass == "running") {
                // Archer has 'thread-id="all"' here
            } 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",
                // symbols-loaded="0"
                QByteArray id = record.findChild("id").data();
                if (!id.isEmpty())
                    showStatusMessage(tr("Library %1 loaded.").arg(_(id)));
            } 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"
                QByteArray id = record.findChild("id").data();
                showStatusMessage(tr("Library %1 unloaded.").arg(_(id)));
            } else if (asyncClass == "thread-group-created") {
                // Archer has "{id="28902"}" 
                QByteArray id = record.findChild("id").data();
                showStatusMessage(tr("Thread group %1 created.").arg(_(id)));
            } else if (asyncClass == "thread-created") {
                //"{id="1",group-id="28902"}" 
                QByteArray id = record.findChild("id").data();
                showStatusMessage(tr("Thread %1 created.").arg(_(id)));
            } else if (asyncClass == "thread-group-exited") {
                // Archer has "{id="28902"}" 
                QByteArray id = record.findChild("id").data();
                showStatusMessage(tr("Thread group %1 exited.").arg(_(id)));
            } else if (asyncClass == "thread-exited") {
                //"{id="1",group-id="28902"}" 
                QByteArray id = record.findChild("id").data();
                QByteArray groupid = record.findChild("group-id").data();
                showStatusMessage(tr("Thread %1 in group %2 exited.")
                    .arg(_(id)).arg(_(groupid)));
            } else if (asyncClass == "thread-selected") {
                QByteArray id = record.findChild("id").data();
                showStatusMessage(tr("Thread %1 selected.").arg(_(id)));
                //"{id="2"}" 
            #if defined(Q_OS_MAC)
            } 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 {
                qDebug() << "IGNORED ASYNC OUTPUT"
                    << asyncClass << record.toString();
            }
            break;
        }

        case '~': {
            static QRegExp re(_("New .hread 0x[0-9a-f]* \\(LWP ([0-9]*)\\)"));
            QByteArray data = GdbMi::parseCString(from, to);
            m_pendingConsoleStreamOutput += data;
            if (re.indexIn(_(data)) != -1)
                maybeHandleInferiorPidChanged(re.cap(1));
            if (data.startsWith("Reading symbols from "))
                showStatusMessage(tr("Reading %1...").arg(_(data.mid(21))));
            break;
        }

        case '@': {
            QByteArray data = GdbMi::parseCString(from, to);
            m_pendingTargetStreamOutput += data;
            break;
        }

        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:"))
                qq->showApplicationOutput(_(data.mid(9))); // cut "warning: "
            break;
        }

        case '^': {
            GdbResultRecord record;

            record.token = token;

            for (inner = from; inner != to; ++inner)
                if (*inner < 'a' || *inner > 'z')
                    break;

            QByteArray resultClass = QByteArray::fromRawData(from, inner - from);
            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;

            from = inner;
            if (from != to) {
                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";
                }
            }

            //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;
        }
    }
}

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

void GdbEngine::readGdbStandardOutput()
{
    int newstart = 0;
    int scan = m_inbuffer.size();

    m_inbuffer.append(m_gdbAdapter->readAllStandardOutput());

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

void GdbEngine::interruptInferior()
{
//    debugMessage(_("GDBENGINE INTERRUPT INFERIOR: %1").arg(m_gdbAdapter->state()));
    qq->notifyInferiorStopRequested();

    if (m_gdbAdapter->state() == AdapterNotRunning) {
        debugMessage(_("TRYING TO INTERRUPT INFERIOR WITHOUT RUNNING GDB"));
        qq->notifyInferiorExited();
        return;
    }

    m_gdbAdapter->interruptInferior();
}

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

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

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

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

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

void GdbEngine::postCommand(const QString &command, GdbCommandFlags flags,
                            GdbCommandCallback callback, const char *callbackName,
                            const QVariant &cookie)
{
    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)
{
    if (!stateAcceptsGdbCommands(m_gdbAdapter->state())) {
        PENDING_DEBUG(_("NO GDB PROCESS RUNNING, CMD IGNORED: ") + cmd.command);
        debugMessage(_("NO GDB PROCESS RUNNING, CMD IGNORED: ") + cmd.command);
        return;
    }

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

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

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

    ++currentToken();
    cmd.postTime = QTime::currentTime();
    m_cookieForToken[currentToken()] = cmd;
    cmd.command = QString::number(currentToken()) + cmd.command;
    if (cmd.flags & EmbedToken)
        cmd.command = cmd.command.arg(currentToken());
    emit gdbInputAvailable(LogInput, cmd.command);

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

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

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

    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(mainWindow(), tr("Error"),
                tr("Executable failed:\n") + QString::fromLocal8Bit(msg));
            showStatusMessage(tr("Process failed to start."));
            exitDebugger();
            //qq->notifyInferiorStopped();
            //qq->notifyInferiorExited();
        }
        return;
    }

    GdbCommand cmd = m_cookieForToken.take(token);
    if (theDebuggerBoolSetting(LogTimeStamps)) {
        emit gdbOutputAvailable(LogTime, _("Response time: %1: %2 s")
            .arg(cmd.command)
            .arg(cmd.postTime.msecsTo(QTime::currentTime()) / 1000.));
    }

    if (record.token < m_oldestAcceptableToken && (cmd.flags & Discardable)) {
        //qDebug() << "### SKIPPING OLD RESULT" << record.toString();
        //QMessageBox::information(mainWindow(), tr("Skipped"), "xxx");
        return;
    }

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

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

    if (cmd.callback)
        (this->*cmd.callback)(record, cmd.cookie);
    if (cmd.adapterCallback)
        (m_gdbAdapter->*cmd.adapterCallback)(record, cmd.cookie);

    if (cmd.flags & RebuildModel) {
        --m_pendingRequests;
        PENDING_DEBUG("   TYPE " << cmd.callbackName << " DECREMENTS PENDING TO: "
            << m_pendingRequests << cmd.command);
        if (m_pendingRequests <= 0) {
            PENDING_DEBUG("\n\n ....  AND TRIGGERS MODEL UPDATE\n");
            rebuildModel();
        }
    } else {
        PENDING_DEBUG("   UNKNOWN TYPE " << cmd.callbackName << " LEAVES PENDING AT: "
            << m_pendingRequests << cmd.command);
    }

    // Continue only if there are no commands wire anymore, so this will
    // be fully synchroneous.
    // 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_continuationAfterDone && m_cookieForToken.isEmpty()) {
        Continuation cont = m_continuationAfterDone;
        m_continuationAfterDone = 0;
        (this->*cont)();
        //showStatusMessage(tr("Continuing after temporary stop."));
    } else {
        PENDING_DEBUG("MISSING TOKENS: " << m_cookieForToken.keys());
    }
}

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

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

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

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

void GdbEngine::handleInfoThreads(const GdbResultRecord &record, const QVariant &)
{
    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;
        }
    }
    // check "* 3 Thread ..."
    QRegExp re(_("^\\*? +\\d+ +[Tt]hread (\\d+)\\.0x.* in"));
    Q_ASSERT(re.isValid());
    if (re.indexIn(data) != -1)
        maybeHandleInferiorPidChanged(re.cap(1));
}

void GdbEngine::handleInfoProc(const GdbResultRecord &record, const QVariant &)
{
    if (record.resultClass == GdbResultDone) {