* fsanitize=bounds-strict caught potential error
[not found] <87o85vp5hs.fsf.ref@yahoo.com>
@ 2021-12-05 13:04 ` Po Lu
2021-12-05 13:55 ` Eli Zaretskii
2021-12-05 15:35 ` Andreas Schwab
0 siblings, 2 replies; 7+ messages in thread
From: Po Lu @ 2021-12-05 13:04 UTC (permalink / raw)
To: emacs-devel
I don't know if this message is correct or not, but I got
xdisp.c:30394:37: runtime error: index -1 out of bounds for type 'iterator_stack_entry [5]'
After displaying the Emacs manual and building with
`-fsanitize=undefined,bounds-strict'.
Thanks.
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: fsanitize=bounds-strict caught potential error
2021-12-05 13:04 ` fsanitize=bounds-strict caught potential error Po Lu
@ 2021-12-05 13:55 ` Eli Zaretskii
2021-12-05 15:15 ` Andreas Schwab
2021-12-05 15:24 ` Andreas Schwab
2021-12-05 15:35 ` Andreas Schwab
1 sibling, 2 replies; 7+ messages in thread
From: Eli Zaretskii @ 2021-12-05 13:55 UTC (permalink / raw)
To: Po Lu; +Cc: emacs-devel
> From: Po Lu <luangruo@yahoo.com>
> Date: Sun, 05 Dec 2021 21:04:47 +0800
>
> I don't know if this message is correct or not, but I got
>
> xdisp.c:30394:37: runtime error: index -1 out of bounds for type 'iterator_stack_entry [5]'
The compiler doesn't know enough to realize that this code can never
be executed with it->sp < 1. This code is there since 2003, and never
gave us any trouble.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: fsanitize=bounds-strict caught potential error
2021-12-05 13:55 ` Eli Zaretskii
@ 2021-12-05 15:15 ` Andreas Schwab
2021-12-05 15:23 ` Eli Zaretskii
2021-12-05 15:24 ` Andreas Schwab
1 sibling, 1 reply; 7+ messages in thread
From: Andreas Schwab @ 2021-12-05 15:15 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Po Lu, emacs-devel
On Dez 05 2021, Eli Zaretskii wrote:
>> From: Po Lu <luangruo@yahoo.com>
>> Date: Sun, 05 Dec 2021 21:04:47 +0800
>>
>> I don't know if this message is correct or not, but I got
>>
>> xdisp.c:30394:37: runtime error: index -1 out of bounds for type 'iterator_stack_entry [5]'
>
> The compiler doesn't know enough to realize that this code can never
> be executed with it->sp < 1. This code is there since 2003, and never
> gave us any trouble.
It is a runtime error, thus the erroneous access is actually being
executed.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: fsanitize=bounds-strict caught potential error
2021-12-05 15:15 ` Andreas Schwab
@ 2021-12-05 15:23 ` Eli Zaretskii
2021-12-05 15:36 ` Eli Zaretskii
0 siblings, 1 reply; 7+ messages in thread
From: Eli Zaretskii @ 2021-12-05 15:23 UTC (permalink / raw)
To: Andreas Schwab; +Cc: luangruo, emacs-devel
> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Po Lu <luangruo@yahoo.com>, emacs-devel@gnu.org
> Date: Sun, 05 Dec 2021 16:15:15 +0100
>
> >> xdisp.c:30394:37: runtime error: index -1 out of bounds for type 'iterator_stack_entry [5]'
> >
> > The compiler doesn't know enough to realize that this code can never
> > be executed with it->sp < 1. This code is there since 2003, and never
> > gave us any trouble.
>
> It is a runtime error, thus the erroneous access is actually being
> executed.
Then let's put an assertion there and find the culprit. Maybe it's
the min-width feature, which is new on master.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: fsanitize=bounds-strict caught potential error
2021-12-05 15:23 ` Eli Zaretskii
@ 2021-12-05 15:36 ` Eli Zaretskii
0 siblings, 0 replies; 7+ messages in thread
From: Eli Zaretskii @ 2021-12-05 15:36 UTC (permalink / raw)
To: schwab, luangruo; +Cc: emacs-devel
> Date: Sun, 05 Dec 2021 17:23:30 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: luangruo@yahoo.com, emacs-devel@gnu.org
>
> > It is a runtime error, thus the erroneous access is actually being
> > executed.
>
> Then let's put an assertion there and find the culprit. Maybe it's
> the min-width feature, which is new on master.
Yep, that it is. Should be fixed now.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: fsanitize=bounds-strict caught potential error
2021-12-05 13:55 ` Eli Zaretskii
2021-12-05 15:15 ` Andreas Schwab
@ 2021-12-05 15:24 ` Andreas Schwab
1 sibling, 0 replies; 7+ messages in thread
From: Andreas Schwab @ 2021-12-05 15:24 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Po Lu, emacs-devel
On Dez 05 2021, Eli Zaretskii wrote:
>> From: Po Lu <luangruo@yahoo.com>
>> Date: Sun, 05 Dec 2021 21:04:47 +0800
>>
>> I don't know if this message is correct or not, but I got
>>
>> xdisp.c:30394:37: runtime error: index -1 out of bounds for type 'iterator_stack_entry [5]'
>
> The compiler doesn't know enough to realize that this code can never
> be executed with it->sp < 1. This code is there since 2003, and never
> gave us any trouble.
If you put a breakpoint there, you will see it.sp == 0 most of the time
actually.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: fsanitize=bounds-strict caught potential error
2021-12-05 13:04 ` fsanitize=bounds-strict caught potential error Po Lu
2021-12-05 13:55 ` Eli Zaretskii
@ 2021-12-05 15:35 ` Andreas Schwab
1 sibling, 0 replies; 7+ messages in thread
From: Andreas Schwab @ 2021-12-05 15:35 UTC (permalink / raw)
To: Po Lu; +Cc: larsi, emacs-devel
On Dez 05 2021, Po Lu wrote:
> I don't know if this message is correct or not, but I got
>
> xdisp.c:30394:37: runtime error: index -1 out of bounds for type 'iterator_stack_entry [5]'
This happens when called by display_min_width.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-12-05 15:36 UTC | newest]
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[not found] <87o85vp5hs.fsf.ref@yahoo.com>
2021-12-05 13:04 ` fsanitize=bounds-strict caught potential error Po Lu
2021-12-05 13:55 ` Eli Zaretskii
2021-12-05 15:15 ` Andreas Schwab
2021-12-05 15:23 ` Eli Zaretskii
2021-12-05 15:36 ` Eli Zaretskii
2021-12-05 15:24 ` Andreas Schwab
2021-12-05 15:35 ` Andreas Schwab
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