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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#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, &QProcess::finished,
this, &BacktraceCollector::onDebuggerFinished);
connect(&d->debugger, &QProcess::errorOccurred,
this, &BacktraceCollector::onDebuggerError);
connect(&d->debugger, &QIODevice::readyRead,
this, &BacktraceCollector::onDebuggerOutputAvailable);
d->debugger.setProcessChannelMode(QProcess::MergedChannels);
}
BacktraceCollector::~BacktraceCollector()
{
delete d;
}
void BacktraceCollector::run(qint64 pid)
{
d->debugger.start(QLatin1String("gdb"), QStringList({
"--nw", // Do not use a window interface.
"--nx", // Do not read .gdbinit file.
"--batch", // Exit after processing options.
"--command", createTemporaryCommandFile(), "--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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