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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qv4functiontable_p.h"
#include "qv4function_p.h"
#include <assembler/MacroAssemblerCodeRef.h>
#include <QtCore/qfile.h>
#include <QtCore/qcoreapplication.h>
QT_BEGIN_NAMESPACE
namespace QV4 {
void generateFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef)
{
// This implements writing of JIT'd addresses so that perf can find the
// symbol names.
//
// Perf expects the mapping to be in a certain place and have certain
// content, for more information, see:
// https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt
static bool doProfile = !qEnvironmentVariableIsEmpty("QV4_PROFILE_WRITE_PERF_MAP");
if (Q_UNLIKELY(doProfile)) {
static QFile perfMapFile(QString::fromLatin1("/tmp/perf-%1.map")
.arg(QCoreApplication::applicationPid()));
static const bool isOpen = perfMapFile.open(QIODevice::WriteOnly);
if (!isOpen) {
qWarning("QV4::JIT::Assembler: Cannot write perf map file.");
doProfile = false;
} else {
const void *address = codeRef->code().executableAddress();
perfMapFile.write(QByteArray::number(reinterpret_cast<quintptr>(address), 16));
perfMapFile.putChar(' ');
perfMapFile.write(QByteArray::number(static_cast<qsizetype>(codeRef->size()), 16));
perfMapFile.putChar(' ');
perfMapFile.write(Function::prettyName(function, address).toUtf8());
perfMapFile.putChar('\n');
perfMapFile.flush();
}
}
}
void destroyFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef)
{
Q_UNUSED(function);
Q_UNUSED(codeRef);
// It's not advisable to remove things from the perf map file, as it's primarily used to analyze
// a trace after the application has terminated. We want to know about all functions that were
// ever jitted then. If the memory ranges overlap, we will have a problem when analyzing the
// trace. The JIT should try to avoid this.
}
size_t exceptionHandlerSize()
{
return 0;
}
} // QV4
QT_END_NAMESPACE
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