Improve QTextDocumentPrivate cursor performance by namezero111111 · Pull Request #31 · qt/qtbase

namezero111111 · 2019-11-23T11:45:15Z

The cursors in QTextDocumentPrivate are held in a QList.
This becomes a serious performance problem with lots of extra selections due to a call to QTextDocumentPrivate::removeCursor() from the QTextCursor destructor.

Given the following test program:

QPlainTextEdit *editor = ...
std::list< QTextCursor> list;
for(int i = 0; i < 100000; ++i) {
QTextCursor c(editor->document());
c.setPosition(std::rand()%100);
list.push_front(c);
}
list.clear(); // <-- clear calls hangs for 3+ seconds due to time spent in QTextDocumentPrivate::removeCursor() dues to QList::removeAll() call

Note the push_front because it exacerbates the issue because the entire list will be traversed.

The change submitted changes the structure to a set; removing the issue.
In theory, this limits that a cursors cannot be in the structure twice, but this neither happens nor would it make sense.

vadi2 · 2019-11-23T17:48:18Z

Thanks for your contribution! Qt doesn't use Github PR's - they use Gerrit instead. Submit it there please :)

namezero111111 · 2019-11-24T07:41:21Z

Thanks vadi2,

I've been trying this for hours now, following https://wiki.qt.io/Setting_up_Gerrit and https://wiki.qt.io/Gerrit_Introduction to set up a test machine for the commit.
However, I'm running into the following:

$ git commit -a
HEAD detached at origin/dev
Changes not staged for commit:
modified: qtbase (modified content)

no changes added to commit

$ git push gerrit HEAD:refs/for/dev
Total 0 (delta 0), reused 0 (delta 0)
remote: Processing changes: refs: 1, done
To ssh://codereview.qt-project.org/qt/qt5
! [remote rejected] HEAD -> refs/for/dev (no new changes)
error: failed to push some refs to 'ssh://codereview.qt-project.org/qt/qt5'

Maybe you have a hint why this isn't working as in the tutorial? I've never used git command line before, so I have just been copy and pasting from the tutorial.

vadi2 · 2019-11-24T08:15:04Z

I am not sure - not a Qt developer myself - but you can ask them about this in https://lists.qt-project.org/listinfo/development, which is a mailing list. You sign up and then you can send them all an email about this. Let me know if you need with that, that's something I know!

namezero111111 · 2019-11-25T07:40:12Z

Thanks, no problem.
I did this once more and it turns out you have to change into the subfolder for the commit because they're sub repositories.
I appreciate your patience.

Use an approximation of the "Unicode Standard Annex #31" for checking the property names and enumerations. Remove check for dynamic properties and use character literal formatting for them instead, which will escape offending characters. As a drive-by, use QStringView parameters for the check function. Amends 53c8d1f. Task-number: QTBUG-126265 Task-number: QTBUG-126860 Pick-to: 6.8 6.7 6.5 6.2 5.15 Change-Id: I90fe555e64327e4164a17c1af0a734e4b1d834db Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

Use an approximation of the "Unicode Standard Annex #31" for checking the property names and enumerations. Remove check for dynamic properties and use character literal formatting for them instead, which will escape offending characters. As a drive-by, use QStringView parameters for the check function. Amends 53c8d1f. Task-number: QTBUG-126265 Task-number: QTBUG-126860 Pick-to: 6.7 6.5 6.2 5.15 Change-Id: I90fe555e64327e4164a17c1af0a734e4b1d834db Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io> (cherry picked from commit aae20da) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

Use an approximation of the "Unicode Standard Annex #31" for checking the property names and enumerations. Remove check for dynamic properties and use character literal formatting for them instead, which will escape offending characters. As a drive-by, use QStringView parameters for the check function. Amends 53c8d1f. Task-number: QTBUG-126265 Task-number: QTBUG-126860 Pick-to: 6.5 6.2 5.15 Change-Id: I90fe555e64327e4164a17c1af0a734e4b1d834db Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io> (cherry picked from commit aae20da) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org> (cherry picked from commit 0925c2d)

…howAndHide() The event filter was still active when the QDialogButtonBox in its destruction process had already been demoted to QWidget. The ignoreShowAndHide guard came too late, because by the time we check it, in Private::handleButtonShowAndHide(), we had already cast q_ptr to QDialogButtonBox. Says UBSan: qdialogbuttonbox_p.h:26:5: runtime error: downcast of address 0x7fffefab47e0 which does not point to an object of type 'QDialogButtonBox' 0x7fffefab47e0: note: object is of type 'QWidget' 00 00 00 00 28 c1 5b 6e 6d 7f 00 00 80 22 10 00 90 61 00 00 d8 c2 5b 6e 6d 7f 00 00 00 00 00 00 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'QWidget' #0 0x7f6d6b51141d in QDialogButtonBoxPrivate::q_func() qdialogbuttonbox_p.h:26 #1 0x7f6d6b51141d in QDialogButtonBoxPrivate::handleButtonShowAndHide(QAbstractButton*, QEvent*) qdialogbuttonbox.cpp:913 #2 0x7f6d6b51436c in eventFilter qdialogbuttonbox.cpp:127 #3 0x7f6d40c1a8f1 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) qcoreapplication.cpp:1248 #4 0x7f6d690b23d5 in QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp:3303 #5 0x7f6d69132a3a in QApplication::notify(QObject*, QEvent*) qapplication.cpp:3259 #6 0x7f6d40c1da6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) qcoreapplication.cpp:1111 #7 0x7f6d40c20473 in QCoreApplication::sendEvent(QObject*, QEvent*) qcoreapplication.cpp:1551 #8 0x7f6d690fe76c in QApplicationPrivate::setActiveWindow(QWidget*) qapplication.cpp:1857 #9 0x7f6d695ac796 in QWidgetPrivate::deactivateWidgetCleanup() qwidget.cpp:2326 #10 0x7f6d6976f8ce in QWidgetPrivate::hide_sys() qwidget.cpp:8256 #11 0x7f6d69814579 in QWidgetPrivate::hide_helper() qwidget.cpp:8199 #12 0x7f6d69887c1f in QWidgetPrivate::setVisible(bool) qwidget.cpp:8406 #13 0x7f6d69775d23 in QWidget::setVisible(bool) qwidget.cpp:8314 #14 0x7f6d695fb018 in QWidget::hide() qwidget.cpp:8179 #15 0x7f6d6981a183 in QWidgetPrivate::handleClose(QWidgetPrivate::CloseMode) qwidget.cpp:8580 #16 0x7f6d699e6fc6 in QWidgetWindow::closeEvent(QCloseEvent*) qwidgetwindow.cpp:871 #17 0x7f6d52ef9f5d in QWindow::event(QEvent*) qwindow.cpp:2721 #18 0x7f6d69a575f8 in QWidgetWindow::event(QEvent*) qwidgetwindow.cpp:398 #19 0x7f6d690b2491 in QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp:3309 #20 0x7f6d69132a3a in QApplication::notify(QObject*, QEvent*) qapplication.cpp:3259 #21 0x7f6d40c1da6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) qcoreapplication.cpp:1111 #22 0x7f6d40c205b3 in QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) qcoreapplication.cpp:1565 #23 0x7f6d5287415b in QGuiApplicationPrivate::processCloseEvent(QWindowSystemInterfacePrivate::CloseEvent*) qguiapplication.cpp:2911 #24 0x7f6d528b543f in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) qguiapplication.cpp:2259 #25 0x7f6d52fb5b02 in QWindowSystemEventHandler::sendEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) qwindowsysteminterface.cpp:190 #26 0x7f6d52fb5b02 in bool QWindowSystemHelper<QWindowSystemInterface::SynchronousDelivery>::handleEvent<QWindowSystemInterfacePrivate::CloseEvent, QWindow*>(QWindow*) qwindowsysteminterface.cpp:102 #27 0x7f6d52fb5b02 in handleWindowSystemEvent<QWindowSystemInterfacePrivate::CloseEvent, QWindowSystemInterface::SynchronousDelivery, QWindow*> qwindowsysteminterface.cpp:138 #28 0x7f6d52fb5b02 in bool QWindowSystemInterface::handleCloseEvent<QWindowSystemInterface::SynchronousDelivery>(QWindow*) qwindowsysteminterface.cpp:351 #29 0x7f6d52cb6f1e in QPlatformWindow::close() qplatformwindow.cpp:348 #30 0x7f6d52e7e158 in QWindow::close() qwindow.cpp:2449 #31 0x7f6d6981b4d2 in QWidgetPrivate::close() qwidget.cpp:8632 #32 0x7f6d698205c6 in QWidget::~QWidget() qwidget.cpp:1508 #33 0x7f6d6b4f6bf0 in QDialogButtonBox::~QDialogButtonBox() qdialogbuttonbox.cpp:496 To fix, don't delay the Q_Q to until after the ignoreShowAndHide check, since that woould be brittle. Instead, do as we for signal/slot connections, which we disconnect explicitly in ~QDialogButtonBox(), and delete the EventFilter explicitly there, too. This way, it's more natural, and also prevents all those useless event filter invocations from having to be processed later on. Amends aff0915. The original code, using QDialogButtonBox::eventFilter(), was not affected, since by the time QDialogButtonBox was demoted to QWidget, QWidget::eventFilter(), not QDialogButtonBox::eventFilter() would been invoked. Which just goes to show that one needs to be very careful with delegating too much responsibilites to the Private class, as it lives, fully derived, until ~QWidget() executes. Pick-to: 6.9 6.8 6.5 Change-Id: I04f36fd6d7d160932bfe1494fdff464786b85047 Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

…howAndHide() The event filter was still active when the QDialogButtonBox in its destruction process had already been demoted to QWidget. The ignoreShowAndHide guard came too late, because by the time we check it, in Private::handleButtonShowAndHide(), we had already cast q_ptr to QDialogButtonBox. Says UBSan: qdialogbuttonbox_p.h:26:5: runtime error: downcast of address 0x7fffefab47e0 which does not point to an object of type 'QDialogButtonBox' 0x7fffefab47e0: note: object is of type 'QWidget' 00 00 00 00 28 c1 5b 6e 6d 7f 00 00 80 22 10 00 90 61 00 00 d8 c2 5b 6e 6d 7f 00 00 00 00 00 00 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'QWidget' #0 0x7f6d6b51141d in QDialogButtonBoxPrivate::q_func() qdialogbuttonbox_p.h:26 #1 0x7f6d6b51141d in QDialogButtonBoxPrivate::handleButtonShowAndHide(QAbstractButton*, QEvent*) qdialogbuttonbox.cpp:913 #2 0x7f6d6b51436c in eventFilter qdialogbuttonbox.cpp:127 #3 0x7f6d40c1a8f1 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) qcoreapplication.cpp:1248 #4 0x7f6d690b23d5 in QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp:3303 #5 0x7f6d69132a3a in QApplication::notify(QObject*, QEvent*) qapplication.cpp:3259 #6 0x7f6d40c1da6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) qcoreapplication.cpp:1111 #7 0x7f6d40c20473 in QCoreApplication::sendEvent(QObject*, QEvent*) qcoreapplication.cpp:1551 #8 0x7f6d690fe76c in QApplicationPrivate::setActiveWindow(QWidget*) qapplication.cpp:1857 #9 0x7f6d695ac796 in QWidgetPrivate::deactivateWidgetCleanup() qwidget.cpp:2326 #10 0x7f6d6976f8ce in QWidgetPrivate::hide_sys() qwidget.cpp:8256 #11 0x7f6d69814579 in QWidgetPrivate::hide_helper() qwidget.cpp:8199 #12 0x7f6d69887c1f in QWidgetPrivate::setVisible(bool) qwidget.cpp:8406 #13 0x7f6d69775d23 in QWidget::setVisible(bool) qwidget.cpp:8314 #14 0x7f6d695fb018 in QWidget::hide() qwidget.cpp:8179 #15 0x7f6d6981a183 in QWidgetPrivate::handleClose(QWidgetPrivate::CloseMode) qwidget.cpp:8580 #16 0x7f6d699e6fc6 in QWidgetWindow::closeEvent(QCloseEvent*) qwidgetwindow.cpp:871 #17 0x7f6d52ef9f5d in QWindow::event(QEvent*) qwindow.cpp:2721 #18 0x7f6d69a575f8 in QWidgetWindow::event(QEvent*) qwidgetwindow.cpp:398 #19 0x7f6d690b2491 in QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp:3309 #20 0x7f6d69132a3a in QApplication::notify(QObject*, QEvent*) qapplication.cpp:3259 #21 0x7f6d40c1da6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) qcoreapplication.cpp:1111 #22 0x7f6d40c205b3 in QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) qcoreapplication.cpp:1565 #23 0x7f6d5287415b in QGuiApplicationPrivate::processCloseEvent(QWindowSystemInterfacePrivate::CloseEvent*) qguiapplication.cpp:2911 #24 0x7f6d528b543f in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) qguiapplication.cpp:2259 #25 0x7f6d52fb5b02 in QWindowSystemEventHandler::sendEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) qwindowsysteminterface.cpp:190 #26 0x7f6d52fb5b02 in bool QWindowSystemHelper<QWindowSystemInterface::SynchronousDelivery>::handleEvent<QWindowSystemInterfacePrivate::CloseEvent, QWindow*>(QWindow*) qwindowsysteminterface.cpp:102 #27 0x7f6d52fb5b02 in handleWindowSystemEvent<QWindowSystemInterfacePrivate::CloseEvent, QWindowSystemInterface::SynchronousDelivery, QWindow*> qwindowsysteminterface.cpp:138 #28 0x7f6d52fb5b02 in bool QWindowSystemInterface::handleCloseEvent<QWindowSystemInterface::SynchronousDelivery>(QWindow*) qwindowsysteminterface.cpp:351 #29 0x7f6d52cb6f1e in QPlatformWindow::close() qplatformwindow.cpp:348 #30 0x7f6d52e7e158 in QWindow::close() qwindow.cpp:2449 #31 0x7f6d6981b4d2 in QWidgetPrivate::close() qwidget.cpp:8632 #32 0x7f6d698205c6 in QWidget::~QWidget() qwidget.cpp:1508 #33 0x7f6d6b4f6bf0 in QDialogButtonBox::~QDialogButtonBox() qdialogbuttonbox.cpp:496 To fix, don't delay the Q_Q to until after the ignoreShowAndHide check, since that woould be brittle. Instead, do as we for signal/slot connections, which we disconnect explicitly in ~QDialogButtonBox(), and delete the EventFilter explicitly there, too. This way, it's more natural, and also prevents all those useless event filter invocations from having to be processed later on. Amends aff0915. The original code, using QDialogButtonBox::eventFilter(), was not affected, since by the time QDialogButtonBox was demoted to QWidget, QWidget::eventFilter(), not QDialogButtonBox::eventFilter() would been invoked. Which just goes to show that one needs to be very careful with delegating too much responsibilites to the Private class, as it lives, fully derived, until ~QWidget() executes. Pick-to: 6.8 6.5 Change-Id: I04f36fd6d7d160932bfe1494fdff464786b85047 Reviewed-by: Axel Spoerl <axel.spoerl@qt.io> (cherry picked from commit dceff0a) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

…howAndHide() The event filter was still active when the QDialogButtonBox in its destruction process had already been demoted to QWidget. The ignoreShowAndHide guard came too late, because by the time we check it, in Private::handleButtonShowAndHide(), we had already cast q_ptr to QDialogButtonBox. Says UBSan: qdialogbuttonbox_p.h:26:5: runtime error: downcast of address 0x7fffefab47e0 which does not point to an object of type 'QDialogButtonBox' 0x7fffefab47e0: note: object is of type 'QWidget' 00 00 00 00 28 c1 5b 6e 6d 7f 00 00 80 22 10 00 90 61 00 00 d8 c2 5b 6e 6d 7f 00 00 00 00 00 00 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'QWidget' #0 0x7f6d6b51141d in QDialogButtonBoxPrivate::q_func() qdialogbuttonbox_p.h:26 #1 0x7f6d6b51141d in QDialogButtonBoxPrivate::handleButtonShowAndHide(QAbstractButton*, QEvent*) qdialogbuttonbox.cpp:913 #2 0x7f6d6b51436c in eventFilter qdialogbuttonbox.cpp:127 #3 0x7f6d40c1a8f1 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) qcoreapplication.cpp:1248 #4 0x7f6d690b23d5 in QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp:3303 #5 0x7f6d69132a3a in QApplication::notify(QObject*, QEvent*) qapplication.cpp:3259 #6 0x7f6d40c1da6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) qcoreapplication.cpp:1111 #7 0x7f6d40c20473 in QCoreApplication::sendEvent(QObject*, QEvent*) qcoreapplication.cpp:1551 #8 0x7f6d690fe76c in QApplicationPrivate::setActiveWindow(QWidget*) qapplication.cpp:1857 #9 0x7f6d695ac796 in QWidgetPrivate::deactivateWidgetCleanup() qwidget.cpp:2326 #10 0x7f6d6976f8ce in QWidgetPrivate::hide_sys() qwidget.cpp:8256 #11 0x7f6d69814579 in QWidgetPrivate::hide_helper() qwidget.cpp:8199 #12 0x7f6d69887c1f in QWidgetPrivate::setVisible(bool) qwidget.cpp:8406 #13 0x7f6d69775d23 in QWidget::setVisible(bool) qwidget.cpp:8314 #14 0x7f6d695fb018 in QWidget::hide() qwidget.cpp:8179 #15 0x7f6d6981a183 in QWidgetPrivate::handleClose(QWidgetPrivate::CloseMode) qwidget.cpp:8580 #16 0x7f6d699e6fc6 in QWidgetWindow::closeEvent(QCloseEvent*) qwidgetwindow.cpp:871 #17 0x7f6d52ef9f5d in QWindow::event(QEvent*) qwindow.cpp:2721 #18 0x7f6d69a575f8 in QWidgetWindow::event(QEvent*) qwidgetwindow.cpp:398 #19 0x7f6d690b2491 in QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp:3309 #20 0x7f6d69132a3a in QApplication::notify(QObject*, QEvent*) qapplication.cpp:3259 #21 0x7f6d40c1da6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) qcoreapplication.cpp:1111 #22 0x7f6d40c205b3 in QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) qcoreapplication.cpp:1565 #23 0x7f6d5287415b in QGuiApplicationPrivate::processCloseEvent(QWindowSystemInterfacePrivate::CloseEvent*) qguiapplication.cpp:2911 #24 0x7f6d528b543f in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) qguiapplication.cpp:2259 #25 0x7f6d52fb5b02 in QWindowSystemEventHandler::sendEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) qwindowsysteminterface.cpp:190 #26 0x7f6d52fb5b02 in bool QWindowSystemHelper<QWindowSystemInterface::SynchronousDelivery>::handleEvent<QWindowSystemInterfacePrivate::CloseEvent, QWindow*>(QWindow*) qwindowsysteminterface.cpp:102 #27 0x7f6d52fb5b02 in handleWindowSystemEvent<QWindowSystemInterfacePrivate::CloseEvent, QWindowSystemInterface::SynchronousDelivery, QWindow*> qwindowsysteminterface.cpp:138 #28 0x7f6d52fb5b02 in bool QWindowSystemInterface::handleCloseEvent<QWindowSystemInterface::SynchronousDelivery>(QWindow*) qwindowsysteminterface.cpp:351 #29 0x7f6d52cb6f1e in QPlatformWindow::close() qplatformwindow.cpp:348 #30 0x7f6d52e7e158 in QWindow::close() qwindow.cpp:2449 #31 0x7f6d6981b4d2 in QWidgetPrivate::close() qwidget.cpp:8632 #32 0x7f6d698205c6 in QWidget::~QWidget() qwidget.cpp:1508 #33 0x7f6d6b4f6bf0 in QDialogButtonBox::~QDialogButtonBox() qdialogbuttonbox.cpp:496 To fix, don't delay the Q_Q to until after the ignoreShowAndHide check, since that woould be brittle. Instead, do as we for signal/slot connections, which we disconnect explicitly in ~QDialogButtonBox(), and delete the EventFilter explicitly there, too. This way, it's more natural, and also prevents all those useless event filter invocations from having to be processed later on. Amends aff0915. The original code, using QDialogButtonBox::eventFilter(), was not affected, since by the time QDialogButtonBox was demoted to QWidget, QWidget::eventFilter(), not QDialogButtonBox::eventFilter() would been invoked. Which just goes to show that one needs to be very careful with delegating too much responsibilites to the Private class, as it lives, fully derived, until ~QWidget() executes. Pick-to: 6.5 Change-Id: I04f36fd6d7d160932bfe1494fdff464786b85047 Reviewed-by: Axel Spoerl <axel.spoerl@qt.io> (cherry picked from commit dceff0a) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org> (cherry picked from commit 6753ab4)

namezero111111 added 2 commits November 23, 2019 12:38

Update qtextdocument_p.h

6d1824b

Update qtextdocument_p.cpp

84b8e95

namezero111111 closed this Nov 25, 2019

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Improve QTextDocumentPrivate cursor performance#31

Improve QTextDocumentPrivate cursor performance#31
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namezero111111 commented Nov 23, 2019 •

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namezero111111 commented Nov 23, 2019 •

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