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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 "stringtable.h"
#include <utils/qtcassert.h>
#include <QDebug>
#include <QThreadPool>
#include <QTime>
using namespace CppTools::Internal;
enum {
GCTimeOut = 10 * 1000 // 10 seconds
};
StringTable::StringTable()
: m_gcRunner(*this)
, m_stopGCRequested(false)
{
m_strings.reserve(1000);
m_gcRunner.setAutoDelete(false);
m_gcCountDown.setObjectName(QLatin1String("StringTable::m_gcCountDown"));
m_gcCountDown.setSingleShot(true);
m_gcCountDown.setInterval(GCTimeOut);
connect(&m_gcCountDown, SIGNAL(timeout()),
this, SLOT(startGC()));
}
QString StringTable::insert(const QString &string)
{
if (string.isEmpty())
return string;
#if QT_SUPPORTS(UNSHARABLE_CONTAINERS)
QTC_ASSERT(const_cast<QString&>(string).data_ptr()->ref.isSharable(), return string);
#endif
m_stopGCRequested.fetchAndStoreAcquire(true);
QMutexLocker locker(&m_lock);
QString result = *m_strings.insert(string);
m_stopGCRequested.fetchAndStoreRelease(false);
return result;
}
void StringTable::scheduleGC()
{
QMutexLocker locker(&m_lock);
m_gcCountDown.start();
}
void StringTable::startGC()
{
QThreadPool::globalInstance()->start(&m_gcRunner);
}
enum {
DebugStringTable = 0
};
static inline bool isQStringInUse(const QString &string)
{
QArrayData *data_ptr = const_cast<QString&>(string).data_ptr();
return data_ptr->ref.isShared() || data_ptr->ref.isStatic();
}
void StringTable::GC()
{
QMutexLocker locker(&m_lock);
int initialSize = 0;
QTime startTime;
if (DebugStringTable) {
initialSize = m_strings.size();
startTime = QTime::currentTime();
}
// Collect all QStrings which have refcount 1. (One reference in m_strings and nowhere else.)
for (QSet<QString>::iterator i = m_strings.begin(); i != m_strings.end();) {
if (m_stopGCRequested.testAndSetRelease(true, false))
return;
if (!isQStringInUse(*i))
i = m_strings.erase(i);
else
++i;
}
if (DebugStringTable) {
const int currentSize = m_strings.size();
qDebug() << "StringTable::GC removed" << initialSize - currentSize
<< "strings in" << startTime.msecsTo(QTime::currentTime())
<< "ms, size is now" << currentSize;
}
}
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