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List: kde-core-devel
Subject: Re: Review Request 127866: Oxygen: Fix QCache usage
From: Michael Pyne <mpyne () kde ! org>
Date: 2017-02-26 0:28:29
Message-ID: 20170226002829.3284.82904 () mimi ! kde ! org
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This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/127866/
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(Updated Feb. 26, 2017, 12:28 a.m.)
Status
------
This change has been marked as submitted.
Review request for kde-workspace and Hugo Pereira Da Costa.
Repository: oxygen
Description
-------
This should mostly complete the QCache fixes I kicked off in a previous RR, 127837. \
Hugo noted there were many other similar usages, and boy he wasn't kidding! ;) The \
long story short is that these usages can theoretically cause use-after-free behavior \
(which can lead to crashes and even undefined behavior if the compiler ever gets \
smart).
*NOTE* It is -much- easier to review if you download the diff to your git repository \
for oxygen and then run "git diff -b" to ignore whitespace changes, particularly for \
the QPixmap changes.
For QPixmaps we return values instead of pointers, so we simply make a separate copy \
to be cached when we do insert. For QColor we return references to values so we \
*must* return pointers, and those have to be owned by a QCache to avoid memleaks. So \
I added a helper function to loop until the cache accepts the new entry. TileSets are \
a similar concern, except those have manual loops since I was uncertain about whether \
TileSet's copy constructor was the best idea or not.
This fixes a ton of Coverity issues (59717 - 259733, 259739, 259742 - 259752, \
1336154, 1336155) and might be associated with Qt bug 38142 and KDE bug 219055 (which \
doesn't actually appear to be a dupe of a different bug to me...).
Diffs
-----
kdecoration/oxygendecohelper.cpp aa75eca
kstyle/oxygenstyle.cpp e428606
kstyle/oxygenstylehelper.h 9510a60
kstyle/oxygenstylehelper.cpp 612ba37
liboxygen/oxygenhelper.h a6453a0
liboxygen/oxygenhelper.cpp 4843604
liboxygen/oxygenshadowcache.cpp 907e586
Diff: https://git.reviewboard.kde.org/r/127866/diff/
Testing
-------
Compiled without warnings, installed and ran `oxygen-demo5 -style oxygen`. Used the \
GUI Benchmark feature to automatically cycle through all the listed features -- no \
crashes or obvious rendering errors.
Thanks,
Michael Pyne
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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/127866/">https://git.reviewboard.kde.org/r/127866/</a>
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<h1 style="margin: 0; padding: 0; font-size: 10pt;">This change has been marked as \
submitted.</h1> </td>
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<div>Review request for kde-workspace and Hugo Pereira Da Costa.</div>
<div>By Michael Pyne.</div>
<p style="color: grey;"><i>Updated Feb. 26, 2017, 12:28 a.m.</i></p>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt;">Repository: </b>
oxygen
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: \
inherit;white-space: inherit;">This should mostly complete the QCache fixes I kicked \
off in a previous RR, 127837. Hugo noted there were many other similar usages, and \
boy he wasn't kidding! ;) The long story short is that these usages can theoretically \
cause use-after-free behavior (which can lead to crashes and even undefined behavior \
if the compiler ever gets smart).</p> <p style="padding: 0;text-rendering: \
inherit;margin: 0;line-height: inherit;white-space: inherit;"><em style="padding: \
0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: \
normal;">NOTE</em> It is -much- easier to review if you download the diff to your git \
repository for oxygen and then run "git diff -b" to ignore whitespace changes, \
particularly for the QPixmap changes.</p> <p style="padding: 0;text-rendering: \
inherit;margin: 0;line-height: inherit;white-space: inherit;">For QPixmaps we return \
values instead of pointers, so we simply make a separate copy to be cached when we do \
insert. For QColor we return references to values so we <em style="padding: \
0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: \
normal;">must</em> return pointers, and those have to be owned by a QCache to avoid \
memleaks. So I added a helper function to loop until the cache accepts the new entry. \
TileSets are a similar concern, except those have manual loops since I was uncertain \
about whether TileSet's copy constructor was the best idea or not.</p> <p \
style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: \
inherit;">This fixes a ton of Coverity issues (59717 - 259733, 259739, 259742 - \
259752, 1336154, 1336155) and might be associated with Qt bug 38142 and KDE bug \
219055 (which doesn't actually appear to be a dupe of a different bug to \
me...).</p></pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: \
inherit;white-space: inherit;">Compiled without warnings, installed and ran <code \
style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: \
0;line-height: inherit;">oxygen-demo5 -style oxygen</code>. Used the GUI Benchmark \
feature to automatically cycle through all the listed features -- no crashes or \
obvious rendering errors.</p></pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kdecoration/oxygendecohelper.cpp <span style="color: grey">(aa75eca)</span></li>
<li>kstyle/oxygenstyle.cpp <span style="color: grey">(e428606)</span></li>
<li>kstyle/oxygenstylehelper.h <span style="color: grey">(9510a60)</span></li>
<li>kstyle/oxygenstylehelper.cpp <span style="color: grey">(612ba37)</span></li>
<li>liboxygen/oxygenhelper.h <span style="color: grey">(a6453a0)</span></li>
<li>liboxygen/oxygenhelper.cpp <span style="color: grey">(4843604)</span></li>
<li>liboxygen/oxygenshadowcache.cpp <span style="color: grey">(907e586)</span></li>
</ul>
<p><a href="https://git.reviewboard.kde.org/r/127866/diff/" style="margin-left: \
3em;">View Diff</a></p>
</td>
</tr>
</table>
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