diff options
Diffstat (limited to 'src/qml/jsruntime/qv4functiontable_unix.cpp')
| -rw-r--r-- | src/qml/jsruntime/qv4functiontable_unix.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4functiontable_unix.cpp b/src/qml/jsruntime/qv4functiontable_unix.cpp new file mode 100644 index 0000000000..25b5c27161 --- /dev/null +++ b/src/qml/jsruntime/qv4functiontable_unix.cpp @@ -0,0 +1,99 @@ +/**************************************************************************** +** +** 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 |