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From c8a4894655eef230702e6cc889f3d40fbb5a9426 Mon Sep 17 00:00:00 2001
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From: Ulf Hermann <ulf.hermann@qt.io>
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Date: Thu, 3 Feb 2022 10:02:06 +0100
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Subject: [PATCH 19/20] V4: Do not call dtor of an object we continue to use
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After destroyObject(), the QObjectWrapper is still alive. We might use
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its heap object again. Furthermore, the Heap::QObjectWrapper dtor does
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not actually do anything defined. What we want to do here is clear the
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QObject pointer because we've just gotten rid of the QObject. There is a
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method for that: Heap::QObjectWrapper::destroy().
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Finally, the internalClass must never ever be nullptr. Assert on that
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rather than checking it.
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Pick-to: 5.15 6.2 6.3
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Task-number: QTBUG-100431
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Change-Id: I794a295c182b2ed4ba80673f58d6143c861b7391
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Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
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Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
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Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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(cherry picked from commit 6c197319f34b8098d034f1543eb5feb9d7be54c3)
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---
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src/qml/jsruntime/qv4qobjectwrapper.cpp | 5 ++---
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1 file changed, 2 insertions(+), 3 deletions(-)
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diff --git a/src/qml/jsruntime/qv4qobjectwrapper.cpp b/src/qml/jsruntime/qv4qobjectwrapper.cpp
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index 9899c9274e..272b85069f 100644
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--- a/src/qml/jsruntime/qv4qobjectwrapper.cpp
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+++ b/src/qml/jsruntime/qv4qobjectwrapper.cpp
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@@ -1160,8 +1160,7 @@ void Heap::QObjectWrapper::markObjects(Heap::Base *that, QV4::MarkStack *markSta
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void QObjectWrapper::destroyObject(bool lastCall)
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{
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Heap::QObjectWrapper *h = d();
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- if (!h->internalClass)
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- return; // destroyObject already got called
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+ Q_ASSERT(h->internalClass);
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if (h->object()) {
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QQmlData *ddata = QQmlData::get(h->object(), false);
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@@ -1191,7 +1190,7 @@ void QObjectWrapper::destroyObject(bool lastCall)
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}
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}
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- h->~Data();
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+ h->destroy();
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}
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--
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2.35.1
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