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/****************************************************************************
**
** Copyright (C) 2016 basysKom GmbH.
** 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 <qtest.h>
#include <QQmlEngine>
#include <QLoggingCategory>
#include <QQmlComponent>
#include <private/qv4mm_p.h>
#include <private/qv4qobjectwrapper_p.h>
#include <private/qjsvalue_p.h>
#include "../../shared/util.h"
#include <memory>
class tst_qv4mm : public QQmlDataTest
{
Q_OBJECT
private slots:
void gcStats();
void multiWrappedQObjects();
void accessParentOnDestruction();
void cleanInternalClasses();
};
void tst_qv4mm::gcStats()
{
QLoggingCategory::setFilterRules("qt.qml.gc.*=true");
QQmlEngine engine;
engine.collectGarbage();
}
void tst_qv4mm::multiWrappedQObjects()
{
QV4::ExecutionEngine engine1;
QV4::ExecutionEngine engine2;
{
QObject object;
for (int i = 0; i < 10; ++i)
QV4::QObjectWrapper::wrap(i % 2 ? &engine1 : &engine2, &object);
QCOMPARE(engine1.memoryManager->m_pendingFreedObjectWrapperValue.size(), 0);
QCOMPARE(engine2.memoryManager->m_pendingFreedObjectWrapperValue.size(), 0);
{
QV4::WeakValue value;
value.set(&engine1, QV4::QObjectWrapper::wrap(&engine1, &object));
}
QCOMPARE(engine1.memoryManager->m_pendingFreedObjectWrapperValue.size(), 1);
QCOMPARE(engine2.memoryManager->m_pendingFreedObjectWrapperValue.size(), 0);
// The additional WeakValue from m_multiplyWrappedQObjects hasn't been moved
// to m_pendingFreedObjectWrapperValue yet. It's still alive after all.
engine1.memoryManager->runGC();
QCOMPARE(engine1.memoryManager->m_pendingFreedObjectWrapperValue.size(), 1);
// engine2 doesn't own the object as engine1 was the first to wrap it above.
// Therefore, no effect here.
engine2.memoryManager->runGC();
QCOMPARE(engine2.memoryManager->m_pendingFreedObjectWrapperValue.size(), 0);
}
// Clears m_pendingFreedObjectWrapperValue. Now it's really dead.
engine1.memoryManager->runGC();
QCOMPARE(engine1.memoryManager->m_pendingFreedObjectWrapperValue.size(), 0);
engine2.memoryManager->runGC();
QCOMPARE(engine2.memoryManager->m_pendingFreedObjectWrapperValue.size(), 0);
}
void tst_qv4mm::accessParentOnDestruction()
{
QLoggingCategory::setFilterRules("qt.qml.gc.*=false");
QQmlEngine engine;
QQmlComponent component(&engine, testFileUrl("createdestroy.qml"));
std::unique_ptr<QObject> obj(component.create());
QVERIFY(obj);
QPointer<QObject> timer = qvariant_cast<QObject *>(obj->property("timer"));
QVERIFY(timer);
QTRY_VERIFY(!timer->property("running").toBool());
QCOMPARE(obj->property("iterations").toInt(), 100);
QCOMPARE(obj->property("creations").toInt(), 100);
QCOMPARE(obj->property("destructions").toInt(), 100);
}
void tst_qv4mm::cleanInternalClasses()
{
QV4::ExecutionEngine engine;
QV4::Scope scope(engine.rootContext());
QV4::ScopedObject object(scope, engine.newObject());
QV4::ScopedObject prototype(scope, engine.newObject());
// Set a prototype so that we get a unique IC.
object->setPrototypeOf(prototype);
QV4::Scoped<QV4::InternalClass> prevIC(scope, object->internalClass());
QVERIFY(prevIC->d()->transitions.empty());
uint prevIcChainLength = 0;
for (QV4::Heap::InternalClass *ic = object->internalClass(); ic; ic = ic->parent)
++prevIcChainLength;
const auto checkICCHainLength = [&]() {
uint icChainLength = 0;
for (QV4::Heap::InternalClass *ic = object->internalClass(); ic; ic = ic->parent)
++icChainLength;
const uint redundant = object->internalClass()->numRedundantTransitions;
QVERIFY(redundant <= QV4::Heap::InternalClass::MaxRedundantTransitions);
// A removal makes two transitions redundant.
QVERIFY(icChainLength <= prevIcChainLength + 2 * redundant);
};
const uint numTransitions = 16 * 1024;
// Keep identifiers in a separate array so that we don't have to allocate them in the loop that
// should test the GC on InternalClass allocations.
QV4::ScopedArrayObject identifiers(scope, engine.newArrayObject());
for (uint i = 0; i < numTransitions; ++i) {
QV4::Scope scope(&engine);
QV4::ScopedString s(scope);
s = engine.newIdentifier(QString::fromLatin1("key%1").arg(i));
identifiers->push_back(s);
QV4::ScopedValue v(scope);
v->setDouble(i);
object->insertMember(s, v);
}
// There is a chain of ICs originating from the original class.
QCOMPARE(prevIC->d()->transitions.size(), 1u);
QVERIFY(prevIC->d()->transitions.front().lookup != nullptr);
// When allocating the InternalClass objects required for deleting properties, eventually
// the IC chain gets truncated, dropping all the removed properties.
for (uint i = 0; i < numTransitions; ++i) {
QV4::Scope scope(&engine);
QV4::ScopedString s(scope, identifiers->get(i));
QV4::Scoped<QV4::InternalClass> ic(scope, object->internalClass());
QVERIFY(ic->d()->parent != nullptr);
QV4::ScopedValue val(scope, object->get(s->toPropertyKey()));
QCOMPARE(val->toNumber(), double(i));
QVERIFY(object->deleteProperty(s->toPropertyKey()));
QVERIFY(!object->hasProperty(s->toPropertyKey()));
QVERIFY(object->internalClass() != ic->d());
}
// None of the properties we've added are left
for (uint i = 0; i < numTransitions; ++i) {
QV4::ScopedString s(scope, identifiers->get(i));
QVERIFY(!object->hasProperty(s->toPropertyKey()));
}
// Also no other properties have appeared
QScopedPointer<QV4::OwnPropertyKeyIterator> iterator(object->ownPropertyKeys(object));
QVERIFY(!iterator->next(object).isValid());
checkICCHainLength();
// Add and remove properties until it clears all remaining redundant ones
uint i = 0;
while (object->internalClass()->numRedundantTransitions > 0) {
i = (i + 1) % numTransitions;
QV4::ScopedString s(scope, identifiers->get(i));
QV4::ScopedValue v(scope);
v->setDouble(i);
object->insertMember(s, v);
QVERIFY(object->deleteProperty(s->toPropertyKey()));
}
// Make sure that all dangling ICs are actually gone.
scope.engine->memoryManager->runGC();
// Now the GC has removed the ICs we originally added by adding properties.
QVERIFY(prevIC->d()->transitions.empty() || prevIC->d()->transitions.front().lookup == nullptr);
// Same thing with redundant prototypes
for (uint i = 0; i < numTransitions; ++i) {
QV4::ScopedObject prototype(scope, engine.newObject());
object->setPrototypeOf(prototype); // Makes previous prototype redundant
}
checkICCHainLength();
}
QTEST_MAIN(tst_qv4mm)
#include "tst_qv4mm.moc"
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