From 484eec96f9b2235780119526faeb6d69536f509c Mon Sep 17 00:00:00 2001 From: Olivier Goffart Date: Sat, 19 Jan 2019 15:32:07 +0100 Subject: Add a couple of tests in QObject::tst_qobject For destructors of functor connected to signals Change-Id: I3f8b18fee7507f3cb72e36a2f9e6ef7f37dbeea1 Reviewed-by: Lars Knoll --- tests/auto/corelib/kernel/qobject/tst_qobject.cpp | 165 ++++++++++++++++++++++ 1 file changed, 165 insertions(+) (limited to 'tests/auto/corelib/kernel/qobject/tst_qobject.cpp') diff --git a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp index 31268c5cf3..b823ca2aab 100644 --- a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp +++ b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp @@ -154,6 +154,8 @@ private slots: void mutableFunctor(); void checkArgumentsForNarrowing(); void nullReceiver(); + void functorReferencesConnection(); + void disconnectDisconnects(); }; struct QObjectCreatedOnShutdown @@ -7487,6 +7489,169 @@ void tst_QObject::nullReceiver() QVERIFY(!connect(&o, SIGNAL(destroyed()), nullObj, SLOT(deleteLater()))); } +void tst_QObject::functorReferencesConnection() +{ + countedStructObjectsCount = 0; + QMetaObject::Connection globalCon; + { + GetSenderObject obj; + CountedStruct counted(&obj); + QCOMPARE(countedStructObjectsCount, 1); + auto c = QSharedPointer::create(); + int slotCalled = 0; + *c = connect(&obj, &GetSenderObject::aSignal, &obj, [&slotCalled, c, counted] { + QObject::disconnect(*c); + slotCalled++; + }); + globalCon = *c; // keep a handle to the connection somewhere; + QVERIFY(globalCon); + QCOMPARE(countedStructObjectsCount, 2); + obj.triggerSignal(); + QCOMPARE(slotCalled, 1); + QCOMPARE(countedStructObjectsCount, 1); + QVERIFY(!globalCon); + obj.triggerSignal(); + QCOMPARE(slotCalled, 1); + QCOMPARE(countedStructObjectsCount, 1); + } + QCOMPARE(countedStructObjectsCount, 0); + + { + GetSenderObject obj; + CountedStruct counted(&obj); + QCOMPARE(countedStructObjectsCount, 1); + auto *rec = new QObject; + int slotCalled = 0; + globalCon = connect(&obj, &GetSenderObject::aSignal, rec, [&slotCalled, rec, counted] { + delete rec; + slotCalled++; + }); + QCOMPARE(countedStructObjectsCount, 2); + obj.triggerSignal(); + QCOMPARE(slotCalled, 1); + QCOMPARE(countedStructObjectsCount, 1); + QVERIFY(!globalCon); + obj.triggerSignal(); + QCOMPARE(slotCalled, 1); + QCOMPARE(countedStructObjectsCount, 1); + } + QCOMPARE(countedStructObjectsCount, 0); + { + int slotCalled = 0; + QEventLoop eventLoop; + { + // Sender will be destroyed when the labda goes out of scope lambda, so it will exit the event loop + auto sender = QSharedPointer::create(); + connect(sender.data(), &QObject::destroyed, &eventLoop, &QEventLoop::quit, Qt::QueuedConnection); + globalCon = connect(sender.data(), &GetSenderObject::aSignal, this, [&slotCalled, sender, &globalCon, this] { + ++slotCalled; + // This signal will be connected, but should never be called as the sender will be destroyed before + auto c2 = connect(sender.data(), &GetSenderObject::aSignal, [] { QFAIL("Should not be called"); }); + QVERIFY(c2); + QVERIFY(QObject::disconnect(sender.data(), nullptr, this, nullptr)); + QVERIFY(!globalCon); // this connection has been disconnected + QVERIFY(c2); // sender should not have been deleted yet, only after the emission is done + }); + QMetaObject::invokeMethod(sender.data(), &GetSenderObject::triggerSignal, Qt::QueuedConnection); + QMetaObject::invokeMethod(sender.data(), &GetSenderObject::triggerSignal, Qt::QueuedConnection); + QMetaObject::invokeMethod(sender.data(), &GetSenderObject::triggerSignal, Qt::QueuedConnection); + } + eventLoop.exec(); + QCOMPARE(slotCalled, 1); + } + + { + GetSenderObject obj; + CountedStruct counted(&obj); + QCOMPARE(countedStructObjectsCount, 1); + auto c1 = QSharedPointer::create(); + auto c2 = QSharedPointer::create(); + int slot1Called = 0; + int slot3Called = 0; + *c1 = connect(&obj, &GetSenderObject::aSignal, &obj, [&slot1Called, &slot3Called, &obj, c1, c2, counted] { + auto c3 = connect(&obj, &GetSenderObject::aSignal, [counted, &slot3Called] { + slot3Called++; + }); + // top-level + the one in the 3 others lambdas + QCOMPARE(countedStructObjectsCount, 4); + QObject::disconnect(*c2); + // the one in the c2's lambda is gone + QCOMPARE(countedStructObjectsCount, 3); + slot1Called++; + }); + connect(&obj, &GetSenderObject::aSignal, [] {}); // just a dummy signal to fill the connection list + *c2 = connect(&obj, &GetSenderObject::aSignal, [counted, c2] { QFAIL("should not be called"); }); + QVERIFY(c1 && c2); + QCOMPARE(countedStructObjectsCount, 3); // top-level + c1 + c2 + obj.triggerSignal(); + QCOMPARE(slot1Called, 1); + QCOMPARE(slot3Called, 0); + QCOMPARE(countedStructObjectsCount, 3); // top-level + c1 + c3 + QObject::disconnect(*c1); + QCOMPARE(countedStructObjectsCount, 2); // top-level + c3 + obj.triggerSignal(); + QCOMPARE(slot1Called, 1); + QCOMPARE(slot3Called, 1); + } + { + struct DestroyEmit { + Q_DISABLE_COPY(DestroyEmit); + explicit DestroyEmit(SenderObject *obj) : obj(obj) {} + SenderObject *obj; + ~DestroyEmit() { + obj->emitSignal1(); + } + }; + SenderObject obj; + int slot1Called = 0; + int slot2Called = 0; + int slot3Called = 0; + auto c1 = QSharedPointer::create(); + auto de = QSharedPointer::create(&obj); + *c1 = connect(&obj, &SenderObject::signal1, [&slot1Called, &slot3Called, de, c1, &obj] { + connect(&obj, &SenderObject::signal1, [&slot3Called] { slot3Called++; }); + slot1Called++; + QObject::disconnect(*c1); + }); + de.clear(); + connect(&obj, &SenderObject::signal1, [&slot2Called] { slot2Called++; }); + obj.emitSignal1(); + QCOMPARE(slot1Called, 1); + QCOMPARE(slot2Called, 2); // because also called from ~DestroyEmit + QCOMPARE(slot3Called, 1); + } +} + +void tst_QObject::disconnectDisconnects() +{ + // Test what happens if the destructor of an functor slot also disconnects more slot; + + SenderObject s1; + QScopedPointer receiver(new QObject); + + auto s2 = QSharedPointer::create(); + QPointer s2_tracker = s2.data(); + int count = 0; + connect(&s1, &SenderObject::signal1, [&count] { count++; }); // α + connect(&s1, &SenderObject::signal1, receiver.data(), [s2] { QFAIL("!!"); }); // β + connect(s2.data(), &SenderObject::signal1, receiver.data(), [] { QFAIL("!!"); }); + connect(&s1, &SenderObject::signal2, receiver.data(), [] { QFAIL("!!"); }); + connect(s2.data(), &SenderObject::signal2, receiver.data(), [] { QFAIL("!!"); }); + connect(&s1, &SenderObject::signal1, [&count] { count++; }); // γ + connect(&s1, &SenderObject::signal2, [&count] { count++; }); // δ + s2.clear(); + + QVERIFY(s2_tracker); + receiver + .reset(); // this will delete the receiver which must also delete s2 as β is disconnected + QVERIFY(!s2_tracker); + // test that the data structures are still in order + s1.emitSignal1(); + QCOMPARE(count, 2); // α + γ + s1.emitSignal2(); + QCOMPARE(count, 3); // + δ +} + // Test for QtPrivate::HasQ_OBJECT_Macro Q_STATIC_ASSERT(QtPrivate::HasQ_OBJECT_Macro::Value); Q_STATIC_ASSERT(!QtPrivate::HasQ_OBJECT_Macro::Value); -- cgit v1.2.3