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/****************************************************************************
**
** Copyright (C) 2016 Research In Motion.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "../../shared/util.h"
#include <QtCore/QObject>
#include <QtQml/qqml.h>
#include <QtQml/QQmlEngine>
#include <QtQml/QQmlComponent>
#include <private/qhashedstring_p.h>
#include <private/qqmlmetatype_p.h>
//Separate test, because if engine cleanup attempts fail they can easily break unrelated tests
class tst_qqmlenginecleanup : public QQmlDataTest
{
Q_OBJECT
public:
tst_qqmlenginecleanup() {}
private slots:
void test_qmlClearTypeRegistrations();
void test_valueTypeProviderModule(); // QTBUG-43004
};
// A wrapper around QQmlComponent to ensure the temporary reference counts
// on the type data as a result of the main thread <> loader thread communication
// are dropped. Regular Synchronous loading will leave us with an event posted
// to the gui thread and an extra refcount that will only be dropped after the
// event delivery. A plain sendPostedEvents() however is insufficient because
// we can't be sure that the event is posted after the constructor finished.
class CleanlyLoadingComponent : public QQmlComponent
{
public:
CleanlyLoadingComponent(QQmlEngine *engine, const QUrl &url)
: QQmlComponent(engine, url, QQmlComponent::Asynchronous)
{ waitForLoad(); }
CleanlyLoadingComponent(QQmlEngine *engine, const QString &fileName)
: QQmlComponent(engine, fileName, QQmlComponent::Asynchronous)
{ waitForLoad(); }
void waitForLoad()
{
QTRY_VERIFY(status() == QQmlComponent::Ready || status() == QQmlComponent::Error);
}
};
void tst_qqmlenginecleanup::test_qmlClearTypeRegistrations()
{
//Test for preventing memory leaks is in tests/manual/qmltypememory
QQmlEngine* engine;
CleanlyLoadingComponent* component;
QUrl testFile = testFileUrl("types.qml");
const auto qmlTypeForTestType = []() {
return QQmlMetaType::qmlType(QStringLiteral("TestTypeCpp"), QStringLiteral("Test"), 2, 0);
};
QVERIFY(!qmlTypeForTestType().isValid());
qmlRegisterType<QObject>("Test", 2, 0, "TestTypeCpp");
QVERIFY(qmlTypeForTestType().isValid());
engine = new QQmlEngine;
component = new CleanlyLoadingComponent(engine, testFile);
QVERIFY(component->isReady());
delete component;
delete engine;
{
auto cppType = qmlTypeForTestType();
qmlClearTypeRegistrations();
QVERIFY(!qmlTypeForTestType().isValid());
// cppType should hold the last ref, qmlClearTypeRegistration should have wiped
// all internal references.
QCOMPARE(QQmlType::refCount(cppType.priv()), 1);
}
//2nd run verifies that types can reload after a qmlClearTypeRegistrations
qmlRegisterType<QObject>("Test", 2, 0, "TestTypeCpp");
QVERIFY(qmlTypeForTestType().isValid());
engine = new QQmlEngine;
component = new CleanlyLoadingComponent(engine, testFile);
QVERIFY(component->isReady());
delete component;
delete engine;
qmlClearTypeRegistrations();
QVERIFY(!qmlTypeForTestType().isValid());
//3nd run verifies that TestTypeCpp is no longer registered
engine = new QQmlEngine;
component = new CleanlyLoadingComponent(engine, testFile);
QVERIFY(component->isError());
QCOMPARE(component->errorString(),
testFile.toString() +":33 module \"Test\" is not installed\n");
delete component;
delete engine;
}
static void cleanState(QQmlEngine **e)
{
delete *e;
qmlClearTypeRegistrations();
*e = new QQmlEngine;
QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
QCoreApplication::processEvents();
}
void tst_qqmlenginecleanup::test_valueTypeProviderModule()
{
// this test ensures that a module which installs a value type
// provider can be reinitialized after multiple calls to
// qmlClearTypeRegistrations() without causing cycles in the
// value type provider list.
QQmlEngine *e = 0;
QUrl testFile1 = testFileUrl("testFile1.qml");
QUrl testFile2 = testFileUrl("testFile2.qml");
bool noCycles = false;
for (int i = 0; i < 20; ++i) {
cleanState(&e);
QQmlComponent c(e, this);
c.loadUrl(i % 2 == 0 ? testFile1 : testFile2); // this will hang if cycles exist.
}
delete e;
e = 0;
noCycles = true;
QVERIFY(noCycles);
// this test ensures that no crashes occur due to using
// a dangling QQmlType pointer in the type compiler
// which results from qmlClearTypeRegistrations()
QUrl testFile3 = testFileUrl("testFile3.qml");
bool noDangling = false;
for (int i = 0; i < 20; ++i) {
cleanState(&e);
QQmlComponent c(e, this);
c.loadUrl(i % 2 == 0 ? testFile1 : testFile3); // this will crash if dangling ptr exists.
}
delete e;
noDangling = true;
QVERIFY(noDangling);
}
QTEST_MAIN(tst_qqmlenginecleanup)
#include "tst_qqmlenginecleanup.moc"
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