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diff --git a/src/qml/qml/qqmlmetatypedata.cpp b/src/qml/qml/qqmlmetatypedata.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2019 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 "qqmlmetatypedata_p.h"
+
+#include <private/qqmltype_p_p.h>
+#include <private/qqmltypemodule_p.h>
+#include <private/qqmlpropertycache_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQmlMetaTypeData::QQmlMetaTypeData()
+{
+}
+
+QQmlMetaTypeData::~QQmlMetaTypeData()
+{
+ for (TypeModules::const_iterator i = uriToModule.constBegin(), cend = uriToModule.constEnd(); i != cend; ++i)
+ delete *i;
+ for (QHash<const QMetaObject *, QQmlPropertyCache *>::Iterator it = propertyCaches.begin(), end = propertyCaches.end();
+ it != end; ++it)
+ (*it)->release();
+
+ // Do this before the attached properties disappear.
+ types.clear();
+ undeletableTypes.clear();
+}
+
+// This expects a "fresh" QQmlTypePrivate and adopts its reference.
+void QQmlMetaTypeData::registerType(QQmlTypePrivate *priv)
+{
+ for (int i = 0; i < types.count(); ++i) {
+ if (!types.at(i).isValid()) {
+ types[i] = QQmlType(priv);
+ priv->index = i;
+ priv->release();
+ return;
+ }
+ }
+ types.append(QQmlType(priv));
+ priv->index = types.count() - 1;
+ priv->release();
+}
+
+QQmlPropertyCache *QQmlMetaTypeData::propertyCacheForMinorVersion(int index, int minorVersion) const
+{
+ return (index < typePropertyCaches.length())
+ ? typePropertyCaches.at(index).value(minorVersion).data()
+ : nullptr;
+}
+
+void QQmlMetaTypeData::setPropertyCacheForMinorVersion(int index, int minorVersion,
+ QQmlPropertyCache *cache)
+{
+ if (index >= typePropertyCaches.length())
+ typePropertyCaches.resize(index + 1);
+ typePropertyCaches[index][minorVersion] = cache;
+}
+
+void QQmlMetaTypeData::clearPropertyCachesForMinorVersion(int index)
+{
+ if (index < typePropertyCaches.length())
+ typePropertyCaches[index].clear();
+}
+
+QQmlPropertyCache *QQmlMetaTypeData::propertyCache(const QMetaObject *metaObject, int minorVersion)
+{
+ if (QQmlPropertyCache *rv = propertyCaches.value(metaObject))
+ return rv;
+
+ if (!metaObject->superClass()) {
+ QQmlPropertyCache *rv = new QQmlPropertyCache(metaObject);
+ propertyCaches.insert(metaObject, rv);
+ return rv;
+ }
+ QQmlPropertyCache *super = propertyCache(metaObject->superClass(), minorVersion);
+ QQmlPropertyCache *rv = super->copyAndAppend(metaObject, minorVersion);
+ propertyCaches.insert(metaObject, rv);
+ return rv;
+}
+
+QQmlPropertyCache *QQmlMetaTypeData::propertyCache(const QQmlType &type, int minorVersion)
+{
+ Q_ASSERT(type.isValid());
+
+ if (QQmlPropertyCache *pc = propertyCacheForMinorVersion(type.index(), minorVersion))
+ return pc;
+
+ QVector<QQmlType> types;
+
+ int maxMinorVersion = 0;
+
+ const QMetaObject *metaObject = type.metaObject();
+
+ while (metaObject) {
+ QQmlType t = QQmlMetaType::qmlType(metaObject, type.module(), type.majorVersion(), minorVersion);
+ if (t.isValid()) {
+ maxMinorVersion = qMax(maxMinorVersion, t.minorVersion());
+ types << t;
+ } else {
+ types << QQmlType();
+ }
+
+ metaObject = metaObject->superClass();
+ }
+
+ if (QQmlPropertyCache *pc = propertyCacheForMinorVersion(type.index(), maxMinorVersion)) {
+ setPropertyCacheForMinorVersion(type.index(), minorVersion, pc);
+ return pc;
+ }
+
+ QQmlPropertyCache *raw = propertyCache(type.metaObject(), minorVersion);
+
+ bool hasCopied = false;
+
+ for (int ii = 0; ii < types.count(); ++ii) {
+ const QQmlType &currentType = types.at(ii);
+ if (!currentType.isValid())
+ continue;
+
+ int rev = currentType.metaObjectRevision();
+ int moIndex = types.count() - 1 - ii;
+
+ if (raw->allowedRevision(moIndex) != rev) {
+ if (!hasCopied) {
+ // TODO: The copy should be mutable, and the original should be const
+ // Considering this, the setAllowedRevision() below does not violate
+ // the immutability of already published property caches.
+ raw = raw->copy();
+ hasCopied = true;
+ }
+ raw->setAllowedRevision(moIndex, rev);
+ }
+ }
+
+ // Test revision compatibility - the basic rule is:
+ // * Anything that is excluded, cannot overload something that is not excluded *
+
+ // Signals override:
+ // * other signals and methods of the same name.
+ // * properties named on<Signal Name>
+ // * automatic <property name>Changed notify signals
+
+ // Methods override:
+ // * other methods of the same name
+
+ // Properties override:
+ // * other elements of the same name
+
+#if 0
+ bool overloadError = false;
+ QString overloadName;
+
+ for (QQmlPropertyCache::StringCache::ConstIterator iter = raw->stringCache.begin();
+ !overloadError && iter != raw->stringCache.end();
+ ++iter) {
+
+ QQmlPropertyData *d = *iter;
+ if (raw->isAllowedInRevision(d))
+ continue; // Not excluded - no problems
+
+ // check that a regular "name" overload isn't happening
+ QQmlPropertyData *current = d;
+ while (!overloadError && current) {
+ current = d->overrideData(current);
+ if (current && raw->isAllowedInRevision(current))
+ overloadError = true;
+ }
+ }
+
+ if (overloadError) {
+ if (hasCopied) raw->release();
+
+ error.setDescription(QLatin1String("Type ") + type.qmlTypeName() + QLatin1Char(' ') + QString::number(type.majorVersion()) + QLatin1Char('.') + QString::number(minorVersion) + QLatin1String(" contains an illegal property \"") + overloadName + QLatin1String("\". This is an error in the type's implementation."));
+ return 0;
+ }
+#endif
+
+ setPropertyCacheForMinorVersion(type.index(), minorVersion, raw);
+
+ if (hasCopied)
+ raw->release();
+
+ if (minorVersion != maxMinorVersion)
+ setPropertyCacheForMinorVersion(type.index(), maxMinorVersion, raw);
+
+ return raw;
+}
+
+QT_END_NAMESPACE
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