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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQMLTYPEMODULE_P_H
#define QQMLTYPEMODULE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtQml/qtqmlglobal.h>
#include <QtQml/private/qstringhash_p.h>
#include <QtQml/private/qqmltype_p.h>
#include <QtCore/qmutex.h>
#include <QtCore/qstring.h>
#include <QtCore/qversionnumber.h>
#include <functional>
QT_BEGIN_NAMESPACE
class QQmlType;
class QQmlTypePrivate;
struct QQmlMetaTypeData;
namespace QV4 {
struct String;
}
class QQmlTypeModule
{
public:
enum class LockLevel {
Open = 0,
Weak = 1,
Strong = 2
};
QQmlTypeModule() = default;
QQmlTypeModule(const QString &uri, quint8 majorVersion)
: m_module(uri), m_majorVersion(majorVersion)
{}
void add(QQmlTypePrivate *);
void remove(const QQmlTypePrivate *type);
LockLevel lockLevel() const { return LockLevel(m_lockLevel.loadRelaxed()); }
bool setLockLevel(LockLevel mode)
{
while (true) {
const int currentLock = m_lockLevel.loadAcquire();
if (currentLock > int(mode))
return false;
if (currentLock == int(mode) || m_lockLevel.testAndSetRelease(currentLock, int(mode)))
return true;
}
}
QString module() const
{
// No need to lock. m_module is const
return m_module;
}
quint8 majorVersion() const
{
// No need to lock. d->majorVersion is const
return m_majorVersion;
}
void addMinorVersion(quint8 minorVersion);
quint8 minimumMinorVersion() const { return m_minMinorVersion.loadRelaxed(); }
quint8 maximumMinorVersion() const { return m_maxMinorVersion.loadRelaxed(); }
QQmlType type(const QHashedStringRef &name, QTypeRevision version) const
{
QMutexLocker lock(&m_mutex);
return findType(m_typeHash.value(name), version);
}
QQmlType type(const QV4::String *name, QTypeRevision version) const
{
QMutexLocker lock(&m_mutex);
return findType(m_typeHash.value(name), version);
}
void walkCompositeSingletons(const std::function<void(const QQmlType &)> &callback) const;
private:
static Q_QML_EXPORT QQmlType findType(
const QList<QQmlTypePrivate *> *types, QTypeRevision version);
const QString m_module;
const quint8 m_majorVersion = 0;
// Can only ever decrease
QAtomicInt m_minMinorVersion = std::numeric_limits<quint8>::max();
// Can only ever increase
QAtomicInt m_maxMinorVersion = 0;
// LockLevel. Can only be increased.
QAtomicInt m_lockLevel = int(LockLevel::Open);
using TypeHash = QStringHash<QList<QQmlTypePrivate *>>;
TypeHash m_typeHash;
mutable QMutex m_mutex;
};
QT_END_NAMESPACE
#endif // QQMLTYPEMODULE_P_H
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