From: Win Treese <treese@acm.org>
To: 43973@debbugs.gnu.org
Subject: bug#43973: 28.0.50; [NS] Two crashes on macOS
Date: Fri, 23 Oct 2020 21:37:43 -0400 [thread overview]
Message-ID: <CF5E3B13-EF45-4E54-90A7-88005CE2B345@acm.org> (raw)
In-Reply-To: <m2o8l6h933.fsf@gmail.com>
I got curious about what was going on with this bug after looking at other alloc/dealloc problems on the Mac, and I’m wondering if there is an initialization problem in setTranform:
The code is:
- (void)setTransform: (double[3][3]) m
{
transform = [[NSAffineTransform transform] retain];
NSAffineTransformStruct tm
= { m[0][0], m[0][1], m[1][0], m[1][1], m[2][0], m[2][1]};
[transform setTransformStruct:tm];
}
It seems to create a new NSAffineTransform object with the existing value of transform. I imagine that would be NULL the first time through. When the deallocation happens (the [transform dealloc] mentioned earlier in the thread, I think the following might happen:
[transform dealloc] essentially calls [NSAffineTransform dealloc], which then tries to dealloc the object it was initialized with, which was null, and it crashes there.
Could that be what’s going on?
- Win
next prev parent reply other threads:[~2020-10-24 1:37 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-13 7:35 bug#43973: 28.0.50; [NS] Two crashes on macOS Andrii Kolomoiets
2020-10-13 13:00 ` Robert Pluim
2020-10-13 20:33 ` Alan Third
2020-10-14 10:46 ` Robert Pluim
2020-10-13 19:09 ` Alan Third
2020-10-14 8:07 ` Andrii Kolomoiets
2020-10-14 8:50 ` Andrii Kolomoiets
2020-10-24 10:35 ` Eli Zaretskii
2020-10-14 20:41 ` Alan Third
2020-10-14 21:01 ` Andrii Kolomoiets
2020-10-14 21:15 ` Alan Third
2020-10-14 21:33 ` Andrii Kolomoiets
2021-01-02 18:25 ` Alan Third
2021-01-02 22:03 ` Andrii Kolomoiets
2021-01-02 22:34 ` Alan Third
2020-10-24 1:37 ` Win Treese [this message]
2020-10-24 16:59 ` Alan Third
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