1 files changed, 120 insertions, 0 deletions
diff --git a/src/qml/qml/qqmltypemodule_p.h b/src/qml/qml/qqmltypemodule_p.h
new file mode 100644
index 0000000000..717b07ec60
--- /dev/null
+++ b/src/qml/qml/qqmltypemodule_p.h
@@ -0,0 +1,120 @@
+// 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