gdbengine.cpp 179 KB
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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company.  For licensing terms and
** conditions see http://www.qt.io/terms-conditions.  For further information
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** use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, The Qt Company gives you certain additional
** rights.  These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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****************************************************************************/
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#include "gdbengine.h"
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#include "attachgdbadapter.h"
#include "coregdbadapter.h"
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#include "gdbplainengine.h"
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#include "termgdbadapter.h"
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#include "remotegdbserveradapter.h"
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#include "gdboptionspage.h"
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#include <debugger/debuggerstartparameters.h>
#include <debugger/debuggerinternalconstants.h>
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#include <debugger/debuggerruncontrol.h>
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#include <debugger/disassemblerlines.h>

#include <debugger/debuggeractions.h>
#include <debugger/debuggercore.h>
#include <debugger/debuggermainwindow.h>
#include <debugger/debuggerplugin.h>
#include <debugger/debuggerprotocol.h>
#include <debugger/debuggerstringutils.h>
#include <debugger/debuggertooltipmanager.h>
#include <debugger/disassembleragent.h>
#include <debugger/memoryagent.h>
#include <debugger/sourceutils.h>
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#include <debugger/terminal.h>
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#include <debugger/breakhandler.h>
#include <debugger/moduleshandler.h>
#include <debugger/registerhandler.h>
#include <debugger/sourcefileshandler.h>
#include <debugger/stackhandler.h>
#include <debugger/threadshandler.h>
#include <debugger/debuggersourcepathmappingwidget.h>
#include <debugger/logwindow.h>
#include <debugger/procinterrupt.h>
#include <debugger/shared/hostutils.h>
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#include <coreplugin/icore.h>
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#include <coreplugin/messagebox.h>
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#include <projectexplorer/devicesupport/deviceprocess.h>
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#include <projectexplorer/itaskhandler.h>
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#include <projectexplorer/taskhub.h>
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#include <texteditor/texteditor.h>
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#include <utils/algorithm.h>
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#include <utils/hostosinfo.h>
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#include <utils/macroexpander.h>
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#include <utils/qtcassert.h>
#include <utils/qtcprocess.h>
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#include <utils/savedaction.h>
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#include <QBuffer>
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#include <QDirIterator>
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#include <QMessageBox>
#include <QPushButton>
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#include <QTemporaryFile>
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using namespace Core;
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using namespace ProjectExplorer;
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using namespace Utils;
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namespace Debugger {
namespace Internal {
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enum { debugPending = 0 };

#define PENDING_DEBUG(s) do { if (debugPending) qDebug() << s; } while (0)
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#define CB(callback) [this](const DebuggerResponse &r) { callback(r); }
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QByteArray GdbEngine::tooltipIName(const QString &exp)
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{
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    return "tooltip." + exp.toLatin1().toHex();
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}

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static bool stateAcceptsGdbCommands(DebuggerState state)
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{
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    switch (state) {
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    case EngineSetupRequested:
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    case EngineSetupOk:
    case EngineSetupFailed:
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    case InferiorUnrunnable:
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    case InferiorSetupRequested:
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    case InferiorSetupFailed:
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    case EngineRunRequested:
    case InferiorRunRequested:
    case InferiorRunOk:
    case InferiorStopRequested:
    case InferiorStopOk:
    case InferiorShutdownRequested:
    case EngineShutdownRequested:
    case InferiorShutdownOk:
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    case InferiorShutdownFailed:
        return true;
    case DebuggerNotReady:
    case InferiorStopFailed:
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    case InferiorSetupOk:
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    case EngineRunFailed:
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    case InferiorExitOk:
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    case InferiorRunFailed:
    case EngineShutdownOk:
    case EngineShutdownFailed:
    case DebuggerFinished:
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        return false;
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    }
    return false;
}
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static int &currentToken()
{
    static int token = 0;
    return token;
}

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static QByteArray parsePlainConsoleStream(const DebuggerResponse &response)
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{
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    QByteArray out = response.consoleStreamOutput;
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    // 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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///////////////////////////////////////////////////////////////////////
//
// Debuginfo Taskhandler
//
///////////////////////////////////////////////////////////////////////

class DebugInfoTask
{
public:
    QString command;
};

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class DebugInfoTaskHandler : public ITaskHandler
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{
public:
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    explicit DebugInfoTaskHandler(GdbEngine *engine)
        : m_engine(engine)
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    {}

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    bool canHandle(const Task &task) const
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    {
        return m_debugInfoTasks.contains(task.taskId);
    }

    void handle(const Task &task)
    {
        m_engine->requestDebugInformation(m_debugInfoTasks.value(task.taskId));
    }

    void addTask(unsigned id, const DebugInfoTask &task)
    {
        m_debugInfoTasks[id] = task;
    }

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    QAction *createAction(QObject *parent) const
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    {
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        QAction *action = new QAction(DebuggerPlugin::tr("Install &Debug Information"), parent);
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        action->setToolTip(DebuggerPlugin::tr("Tries to install missing debug information."));
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        return action;
    }

private:
    GdbEngine *m_engine;
    QHash<unsigned, DebugInfoTask> m_debugInfoTasks;
};

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

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GdbEngine::GdbEngine(const DebuggerStartParameters &startParameters)
  : DebuggerEngine(startParameters)
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{
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    setObjectName(_("GdbEngine"));
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    m_busy = false;
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    m_gdbVersion = 100;
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    m_isQnxGdb = false;
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    m_registerNamesListed = false;
    m_sourcesListUpdating = false;
    m_oldestAcceptableToken = -1;
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    m_nonDiscardableCount = 0;
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    m_outputCodec = QTextCodec::codecForLocale();
    m_pendingBreakpointRequests = 0;
    m_commandsDoneCallback = 0;
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    m_stackNeeded = false;
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    m_terminalTrap = startParameters.useTerminal;
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    m_fullStartDone = false;
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    m_systemDumpersLoaded = false;
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    m_gdbProc = new GdbProcess(this);
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    m_debugInfoTaskHandler = new DebugInfoTaskHandler(this);
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    //ExtensionSystem::PluginManager::addObject(m_debugInfoTaskHandler);
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    m_commandTimer.setSingleShot(true);
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    connect(&m_commandTimer, &QTimer::timeout,
            this, &GdbEngine::commandTimeout);

    connect(action(AutoDerefPointers), &SavedAction::valueChanged,
            this, &GdbEngine::reloadLocals);
    connect(action(CreateFullBacktrace), &QAction::triggered,
            this, &GdbEngine::createFullBacktrace);
    connect(action(UseDebuggingHelpers), &SavedAction::valueChanged,
            this, &GdbEngine::reloadLocals);
    connect(action(UseDynamicType), &SavedAction::valueChanged,
            this, &GdbEngine::reloadLocals);
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}

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GdbEngine::~GdbEngine()
{
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    //ExtensionSystem::PluginManager::removeObject(m_debugInfoTaskHandler);
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    delete m_debugInfoTaskHandler;
    m_debugInfoTaskHandler = 0;

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    // Prevent sending error messages afterwards.
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    disconnect();
}

DebuggerStartMode GdbEngine::startMode() const
{
    return startParameters().startMode;
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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.\n%2")
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                .arg(m_gdb, m_gdbProc->errorString());
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        case QProcess::Crashed:
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            if (targetState() == DebuggerFinished)
                return tr("The gdb process crashed some time after starting "
                    "successfully.");
            else
                return tr("The gdb process was ended forcefully");
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        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, "
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                "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.");
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        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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// Parse "~:gdb: unknown target exception 0xc0000139 at 0x77bef04e\n"
// and return an exception message
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static inline QString msgWinException(const QByteArray &data, unsigned *exCodeIn = 0)
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{
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    if (exCodeIn)
        *exCodeIn = 0;
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    const int exCodePos = data.indexOf("0x");
    const int blankPos = exCodePos != -1 ? data.indexOf(' ', exCodePos + 1) : -1;
    const int addressPos = blankPos != -1 ? data.indexOf("0x", blankPos + 1) : -1;
    if (addressPos < 0)
        return GdbEngine::tr("An exception was triggered.");
    const unsigned exCode = data.mid(exCodePos, blankPos - exCodePos).toUInt(0, 0);
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    if (exCodeIn)
        *exCodeIn = exCode;
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    const quint64 address = data.mid(addressPos).trimmed().toULongLong(0, 0);
    QString rc;
    QTextStream str(&rc);
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    str << GdbEngine::tr("An exception was triggered:") << ' ';
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    formatWindowsException(exCode, address, 0, 0, 0, str);
    str << '.';
    return rc;
}

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void GdbEngine::readDebugeeOutput(const QByteArray &data)
{
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    QString msg = m_outputCodec->toUnicode(data.constData(), data.length(),
        &m_outputCodecState);
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    showMessage(msg, AppOutput);
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}

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static bool isNameChar(char c)
{
    // could be 'stopped' or 'shlibs-added'
    return (c >= 'a' && c <= 'z') || c == '-';
}

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static bool contains(const QByteArray &message, const char *pattern, int size)
{
    const int s = message.size();
    if (s < size)
        return false;
    const int pos = message.indexOf(pattern);
    if (pos == -1)
        return false;
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    const bool beginFits = pos == 0 || message.at(pos - 1) == '\n';
    const bool endFits = pos + size == s || message.at(pos + size) == '\n';
    return beginFits && endFits;
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}

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static bool isGdbConnectionError(const QByteArray &message)
{
    // Handle messages gdb client produces when the target exits (gdbserver)
    //
    // we get this as response either to a specific command, e.g.
    //    31^error,msg="Remote connection closed"
    // or as informative output:
    //    &Remote connection closed
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    const char msg1[] = "Remote connection closed";
    const char msg2[] = "Remote communication error.  Target disconnected.: No error.";
    const char msg3[] = "Quit";

    return contains(message, msg1, sizeof(msg1) - 1)
        || contains(message, msg2, sizeof(msg2) - 1)
        || contains(message, msg3, sizeof(msg3) - 1);
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}

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void GdbEngine::handleResponse(const QByteArray &buff)
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{
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    showMessage(QString::fromLocal8Bit(buff, buff.length()), LogOutput);
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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;
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    // Token is a sequence of numbers.
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    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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    // Next char decides kind of response.
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    const char c = *from++;
    switch (c) {
        case '*':
        case '+':
        case '=': {
            QByteArray asyncClass;
            for (; from != to; ++from) {
                const char c = *from;
                if (!isNameChar(c))
                    break;
                asyncClass += *from;
            }
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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();
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                    result.m_children.push_back(data);
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                    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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                m_pendingLogStreamOutput.clear();
                m_pendingConsoleStreamOutput.clear();
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            } else if (asyncClass == "running") {
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                GdbMi threads = result["thread-id"];
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                threadsHandler()->notifyRunning(threads.data());
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                if (state() == InferiorRunOk || state() == InferiorSetupRequested) {
                    // We get multiple *running after thread creation and in Windows terminals.
                    showMessage(QString::fromLatin1("NOTE: INFERIOR STILL RUNNING IN STATE %1.").
                                arg(QLatin1String(DebuggerEngine::stateName(state()))));
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                } else if (HostOsInfo::isWindowsHost() && (state() == InferiorStopRequested
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                               || state() == InferiorShutdownRequested)) {
                    // FIXME: Breakpoints on Windows are exceptions which are thrown in newly
                    // created threads so we have to filter out the running threads messages when
                    // we request a stop.
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                } else {
                    notifyInferiorRunOk();
                }
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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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                // id="/lib/i386-linux-gnu/libc.so.6"
                // target-name="/lib/i386-linux-gnu/libc.so.6"
                // host-name="/lib/i386-linux-gnu/libc.so.6"
                // symbols-loaded="0",thread-group="i1"
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                QByteArray id = result["id"].data();
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                if (!id.isEmpty())
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                    showStatusMessage(tr("Library %1 loaded").arg(_(id)), 1000);
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                progressPing();
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                Module module;
                module.startAddress = 0;
                module.endAddress = 0;
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                module.hostPath = _(result["host-name"].data());
                module.modulePath = _(result["target-name"].data());
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                module.moduleName = QFileInfo(module.hostPath).baseName();
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                modulesHandler()->updateModule(module);
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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["id"].data();
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                progressPing();
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                showStatusMessage(tr("Library %1 unloaded").arg(_(id)), 1000);
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            } else if (asyncClass == "thread-group-added") {
                // 7.1-symbianelf has "{id="i1"}"
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            } else if (asyncClass == "thread-group-created"
                    || asyncClass == "thread-group-started") {
                // Archer had only "{id="28902"}" at some point of 6.8.x.
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                // *-started seems to be standard in 7.1, but in early
                // 7.0.x, there was a *-created instead.
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                progressPing();
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                // 7.1.50 has thread-group-started,id="i1",pid="3529"
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                QByteArray id = result["id"].data();
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                showStatusMessage(tr("Thread group %1 created").arg(_(id)), 1000);
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                int pid = id.toInt();
                if (!pid) {
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                    id = result["pid"].data();
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                    pid = id.toInt();
                }
                if (pid)
                    notifyInferiorPid(pid);
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                handleThreadGroupCreated(result);
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            } else if (asyncClass == "thread-created") {
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                //"{id="1",group-id="28902"}"
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                QByteArray id = result["id"].data();
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                showStatusMessage(tr("Thread %1 created").arg(_(id)), 1000);
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                ThreadData thread;
                thread.id = ThreadId(id.toLong());
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                thread.groupId = result["group-id"].data();
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                threadsHandler()->updateThread(thread);
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            } else if (asyncClass == "thread-group-exited") {
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                // Archer has "{id="28902"}"
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                QByteArray id = result["id"].data();
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                showStatusMessage(tr("Thread group %1 exited").arg(_(id)), 1000);
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                handleThreadGroupExited(result);
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            } else if (asyncClass == "thread-exited") {
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                //"{id="1",group-id="28902"}"
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                QByteArray id = result["id"].data();
                QByteArray groupid = result["group-id"].data();
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                showStatusMessage(tr("Thread %1 in group %2 exited")
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                    .arg(_(id)).arg(_(groupid)), 1000);
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                threadsHandler()->removeThread(ThreadId(id.toLong()));
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            } else if (asyncClass == "thread-selected") {
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                QByteArray id = result["id"].data();
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                showStatusMessage(tr("Thread %1 selected").arg(_(id)), 1000);
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                //"{id="2"}"
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            } else if (asyncClass == "breakpoint-modified") {
                // New in FSF gdb since 2011-04-27.
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                // "{bkpt={number="3",type="breakpoint",disp="keep",
                // enabled="y",addr="<MULTIPLE>",times="1",
                // original-location="\\",simple_gdbtest_app.cpp\\":135"},
                // {number="3.1",enabled="y",addr="0x0805ff68",
                // func="Vector<int>::Vector(int)",
                // file="simple_gdbtest_app.cpp",
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                // fullname="/data/...line="135"},{number="3.2"...}}.."
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                // Note the leading comma in original-location. Filter it out.
                // We don't need the field anyway.
                QByteArray ba = result.toString();
                ba = '[' + ba.mid(6, ba.size() - 7) + ']';
                const int pos1 = ba.indexOf(",original-location");
                const int pos2 = ba.indexOf("\":", pos1 + 2);
                const int pos3 = ba.indexOf('"', pos2 + 2);
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                ba.remove(pos1, pos3 - pos1 + 1);
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                result = GdbMi();
                result.fromString(ba);
                BreakHandler *handler = breakHandler();
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                Breakpoint bp;
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                BreakpointResponse br;
                foreach (const GdbMi &bkpt, result.children()) {
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                    const QByteArray nr = bkpt["number"].data();
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                    BreakpointResponseId rid(nr);
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                    if (!isHiddenBreakpoint(rid)) {
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                        if (nr.contains('.')) {
                            // A sub-breakpoint.
                            BreakpointResponse sub;
                            updateResponse(sub, bkpt);
                            sub.id = rid;
                            sub.type = br.type;
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                            bp.insertSubBreakpoint(sub);
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                        } else {
                            // A primary breakpoint.
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                            bp = handler->findBreakpointByResponseId(rid);
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                            //qDebug() << "NR: " << nr << "RID: " << rid
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                            //    << "ID: " << bp.id();
                            br = bp.response();
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                            updateResponse(br, bkpt);
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                            bp.setResponse(br);
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                        }
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                    }
                }
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            } else if (asyncClass == "breakpoint-created") {
                // "{bkpt={number="1",type="breakpoint",disp="del",enabled="y",
                //  addr="<PENDING>",pending="main",times="0",
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                //  original-location="main"}}" -- or --
                // {bkpt={number="2",type="hw watchpoint",disp="keep",enabled="y",
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                // what="*0xbfffed48",times="0",original-location="*0xbfffed48"}}
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                BreakHandler *handler = breakHandler();
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                foreach (const GdbMi &bkpt, result.children()) {
                    BreakpointResponse br;
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                    br.type = BreakpointByFileAndLine;
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                    updateResponse(br, bkpt);
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                    handler->handleAlienBreakpoint(br, this);
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                }
            } else if (asyncClass == "breakpoint-deleted") {
                // "breakpoint-deleted" "{id="1"}"
                // New in FSF gdb since 2011-04-27.
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                QByteArray nr = result["id"].data();
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                BreakpointResponseId rid(nr);
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                if (Breakpoint bp = breakHandler()->findBreakpointByResponseId(rid)) {
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                    // This also triggers when a temporary breakpoint is hit.
                    // We do not really want that, as this loses all information.
                    // FIXME: Use a special marker for this case?
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                    if (!bp.isOneShot())
                        bp.removeAlienBreakpoint();
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                }
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            } else if (asyncClass == "cmd-param-changed") {
                // New since 2012-08-09
                //  "{param="debug remote",value="1"}"
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            } else if (asyncClass == "memory-changed") {
                // New since 2013
                //   "{thread-group="i1",addr="0x0918a7a8",len="0x10"}"
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            } 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.
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            if (!inferiorPid()) {
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                // 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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                progressPing();
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            } else if (data.startsWith("[New ") || data.startsWith("[Thread ")) {
                if (data.endsWith('\n'))
                    data.chop(1);
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                progressPing();
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                showStatusMessage(_(data), 1000);
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            } else if (data.startsWith("gdb: unknown target exception 0x")) {
                // [Windows, most likely some DLL/Entry point not found]:
                // "gdb: unknown target exception 0xc0000139 at 0x77bef04e"
                // This may be fatal and cause the target to exit later
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                unsigned exCode;
                m_lastWinException = msgWinException(data, &exCode);
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                showMessage(m_lastWinException, LogMisc);
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                const Task::TaskType type = isFatalWinException(exCode) ? Task::Error : Task::Warning;
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                TaskHub::addTask(type, m_lastWinException, Constants::TASK_CATEGORY_DEBUGGER_RUNTIME);
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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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                showMessage(_(data.mid(9)), AppStuff); // Cut "warning: "
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            if (isGdbConnectionError(data)) {
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                notifyInferiorExited();
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                break;
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            }
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            if (boolSetting(IdentifyDebugInfoPackages)) {
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                // From SuSE's gdb: >&"Missing separate debuginfo for ...\n"
                // ">&"Try: zypper install -C \"debuginfo(build-id)=c084ee5876ed1ac12730181c9f07c3e027d8e943\"\n"
                if (data.startsWith("Missing separate debuginfo for ")) {
                    m_lastMissingDebugInfo = QString::fromLocal8Bit(data.mid(32));
                } else if (data.startsWith("Try: zypper")) {
                    QString cmd = QString::fromLocal8Bit(data.mid(4));

                    Task task(Task::Warning,
                        tr("Missing debug information for %1\nTry: %2")
                            .arg(m_lastMissingDebugInfo).arg(cmd),
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                        FileName(), 0, Debugger::Constants::TASK_CATEGORY_DEBUGGER_DEBUGINFO);
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                    TaskHub::addTask(task);
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                    DebugInfoTask dit;
                    dit.command = cmd;
                    m_debugInfoTaskHandler->addTask(task.taskId, dit);
                }
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            }

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            break;
        }

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        case '^': {
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            DebuggerResponse 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 = ResultDone;
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            else if (resultClass == "running")
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                response.resultClass = ResultRunning;
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            else if (resultClass == "connected")
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                response.resultClass = ResultConnected;
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            else if (resultClass == "error")
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                response.resultClass = ResultError;
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            else if (resultClass == "exit")
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                response.resultClass = ResultExit;
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            else
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                response.resultClass = ResultUnknown;
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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 {
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                    // 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.logStreamOutput = m_pendingLogStreamOutput;
            response.consoleStreamOutput =  m_pendingConsoleStreamOutput;
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            m_pendingLogStreamOutput.clear();
            m_pendingConsoleStreamOutput.clear();

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

void GdbEngine::readGdbStandardError()
{
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    QByteArray err = m_gdbProc->readAllStandardError();
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    showMessage(_("UNEXPECTED GDB STDERR: " + err));
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    if (err == "Undefined command: \"bb\".  Try \"help\".\n")
        return;
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    if (err.startsWith("BFD: reopening"))
        return;
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    qWarning() << "Unexpected GDB stderr:" << err;
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}

void GdbEngine::readGdbStandardOutput()
{
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    m_commandTimer.start(); // Restart timer.
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    int newstart = 0;
    int scan = m_inbuffer.size();
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    QByteArray out = m_gdbProc->readAllStandardOutput();
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    m_inbuffer.append(out);
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    // This can trigger when a dialog starts a nested event loop.
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    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;
        if (m_inbuffer.at(end - 1) == '\r') {
            --end;
            if (end == start)
                continue;
        }
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        m_busy = true;
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        QByteArray ba = QByteArray::fromRawData(m_inbuffer.constData() + start, end - start);
        handleResponse(ba);
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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() == InferiorStopRequested,
        qDebug() << "INTERRUPT INFERIOR: " << state(); return);
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    if (terminal()->sendInterrupt())
        return;

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    if (usesExecInterrupt()) {
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        postCommand("-exec-interrupt", Immediate);
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    } else {
        showStatusMessage(tr("Stop requested..."), 5000);
        showMessage(_("TRYING TO INTERRUPT INFERIOR"));
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        if (HostOsInfo::isWindowsHost() && !m_isQnxGdb) {
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            QTC_ASSERT(state() == InferiorStopRequested, qDebug() << state(); notifyInferiorStopFailed());
            QTC_ASSERT(!m_signalOperation, notifyInferiorStopFailed());
            m_signalOperation = startParameters().device->signalOperation();
            QTC_ASSERT(m_signalOperation, notifyInferiorStopFailed());
            connect(m_signalOperation.data(), SIGNAL(finished(QString)),
                    SLOT(handleInterruptDeviceInferior(QString)));

            m_signalOperation->setDebuggerCommand(startParameters().debuggerCommand);
            m_signalOperation->interruptProcess(inferiorPid());
        } else {
            interruptInferior2();
        }
    }
}

void GdbEngine::handleInterruptDeviceInferior(const QString &error)
{
    if (error.isEmpty()) {
        showMessage(QLatin1String("Interrupted ") + QString::number(inferiorPid()));
        notifyInferiorStopOk();
    } else {
        showMessage(error, LogError);
        notifyInferiorStopFailed();
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    }
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    m_signalOperation->disconnect(this);
    m_signalOperation.clear();
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}

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void GdbEngine::interruptInferiorTemporarily()
{
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    foreach (const DebuggerCommand &cmd, m_commandsToRunOnTemporaryBreak) {
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        if (cmd.flags & LosesChild) {
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            notifyInferiorIll();
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            return;
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        }
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    }
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    requestInterruptInferior();
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}

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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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        showMessage(_("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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    showMessage(_("FOUND PID %1").arg(pid));
    notifyInferiorPid(pid);
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}

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void GdbEngine::runCommand(const DebuggerCommand &command)
{
    QByteArray cmd  = command.function + "({" + command.args + "})";
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    postCommand("python theDumper." + cmd, command.flags, command.callback);
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}