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/**************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** 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
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "backtracecollector.h"
#include <QDebug>
#include <QScopedPointer>
#include <QTemporaryFile>
const char GdbBatchCommands[] =
"set height 0\n"
"set width 0\n"
"thread\n"
"thread apply all backtrace full\n";
class BacktraceCollectorPrivate
{
public:
BacktraceCollectorPrivate() : errorOccurred(false) {}
bool errorOccurred;
QScopedPointer<QTemporaryFile> commandFile;
QProcess debugger;
QString output;
};
BacktraceCollector::BacktraceCollector(QObject *parent) :
QObject(parent), d(new BacktraceCollectorPrivate)
{
connect(&d->debugger, SIGNAL(finished(int,QProcess::ExitStatus)),
SLOT(onDebuggerFinished(int,QProcess::ExitStatus)));
connect(&d->debugger, SIGNAL(error(QProcess::ProcessError)),
SLOT(onDebuggerError(QProcess::ProcessError)));
connect(&d->debugger, SIGNAL(readyRead()), SLOT(onDebuggerOutputAvailable()));
d->debugger.setProcessChannelMode(QProcess::MergedChannels);
}
BacktraceCollector::~BacktraceCollector()
{
delete d;
}
void BacktraceCollector::run(Q_PID pid)
{
d->debugger.start(QLatin1String("gdb"), QStringList()
<< QLatin1String("--nw") // Do not use a window interface.
<< QLatin1String("--nx") // Do not read .gdbinit file.
<< QLatin1String("--batch") // Exit after processing options.
<< QLatin1String("--command") << createTemporaryCommandFile()
<< QLatin1String("--pid") << QString::number(pid)
);
}
bool BacktraceCollector::isRunning() const
{
return d->debugger.state() == QProcess::Running;
}
void BacktraceCollector::kill()
{
d->debugger.kill();
}
void BacktraceCollector::onDebuggerFinished(int exitCode, QProcess::ExitStatus /*exitStatus*/)
{
if (d->errorOccurred) {
emit error(QLatin1String("QProcess: ") + d->debugger.errorString());
return;
}
if (exitCode != 0) {
emit error(QString::fromLatin1("Debugger exited with code %1.").arg(exitCode));
return;
}
emit backtrace(d->output);
}
void BacktraceCollector::onDebuggerError(QProcess::ProcessError /*error*/)
{
d->errorOccurred = true;
}
QString BacktraceCollector::createTemporaryCommandFile()
{
d->commandFile.reset(new QTemporaryFile);
if (!d->commandFile->open()) {
emit error(QLatin1String("Error: Could not create temporary command file."));
return QString();
}
if (d->commandFile->write(GdbBatchCommands) == -1) {
emit error(QLatin1String("Error: Could not write temporary command file."));
return QString();
}
d->commandFile->close();
return d->commandFile->fileName();
}
void BacktraceCollector::onDebuggerOutputAvailable()
{
const QString newChunk = QString::fromLocal8Bit(d->debugger.readAll());
d->output.append(newChunk);
emit backtraceChunk(newChunk);
}
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