From: Eli Zaretskii <eliz@gnu.org>
To: Tassilo Horn <tsdh@gnu.org>
Cc: storm@cua.dk, monnier@iro.umontreal.ca, 21747@debbugs.gnu.org,
bruce.connor.am@gmail.com
Subject: bug#21747: 25.0.50; while-no-input breaks kbd event handling when called from post-command-hook
Date: Sat, 24 Oct 2015 17:05:10 +0300 [thread overview]
Message-ID: <83lhasweeh.fsf@gnu.org> (raw)
In-Reply-To: <87fv109yxo.fsf@gnu.org>
> From: Tassilo Horn <tsdh@gnu.org>
> Cc: bruce.connor.am@gmail.com, monnier@iro.umontreal.ca, storm@cua.dk, 21747@debbugs.gnu.org
> Date: Sat, 24 Oct 2015 15:30:11 +0200
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> >> My recipe for reproduction is
> >>
> >> 1. emacs -Q
> >> 2. M-x package-initialize
> >> 3. M-x global-aggressive-indent-mode
> >> 4. C-x C-f ~/test.sh
> >> 5. type the keyword if where the i is displayed immediately
> >> and the display of f is delayed
> >>
> >> This does only occur for sh-mode keywords like if, while, etc. where the
> >> delaying starts with after entering the last char of the keyword. Also,
> >> I can reproduce that problem only if test.sh doesn't exist.
> >
> > I don't understand: are you saying that the post-command-hook finished
> > its job, and yet redisplay is not entered?
>
> Yes, or rather the function aggressive-indent--indent-if-changed which
> is in post-command-hook finished.
>
> >> Or well, I just tried what happens when I replace the `while-no-input'
> >> with a `progn'. Then Emacs goes into some infloop. Attaching with gdb
> >> shows:
> >
> > There's a procedure in etc/DEBUG to determine which call-stack frame
> > infloops, please use it and tell what you found.
>
> Ok, so with the aggressive-indent--indent-if-changed where
> while-no-input is replaced with progn, I perform my recipe until emacs
> infloops. Then do "kill -TSTP <PID>" and repeatedly "finish" at the gdb
> prompt. But the last frame being displayed in GDB before finish doesn't
> return anymore is not always the same. Most of the time it is poll ()
> from /usr/lib/libc.so.6. Here are two other results.
No, that's bogus (GC cannot infloop, you just didn't wait long enough
for that "finish" to return).
The function that infloops is re-search-backward, because it is called
with LIMIT set to zero. The real problem is here:
(defun sh-smie--keyword-p ()
"Non-nil if we're at a keyword position.
A keyword position is one where if we're looking at something that looks
like a keyword, then it is a keyword."
(let ((prev (funcall smie-backward-token-function)))
(if (zerop (length prev))
(looking-back "\\`\\|\\s(" (1- (point))) <<<<<<<<<<<<<<<<<<
(assoc prev smie-grammar))))
What do you expect looking-back to do here when point is at BOB?
next prev parent reply other threads:[~2015-10-24 14:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-24 7:42 bug#21747: 25.0.50; while-no-input breaks kbd event handling when called from post-command-hook Tassilo Horn
2015-10-24 8:02 ` Eli Zaretskii
2015-10-24 8:53 ` Tassilo Horn
2015-10-24 9:14 ` Eli Zaretskii
2015-10-24 9:49 ` Tassilo Horn
2015-10-24 10:30 ` Artur Malabarba
2015-10-24 10:52 ` Eli Zaretskii
2015-10-24 12:13 ` Tassilo Horn
2015-10-24 12:45 ` Eli Zaretskii
2015-10-24 13:30 ` Tassilo Horn
2015-10-24 13:57 ` Artur Malabarba
2015-10-24 14:06 ` Eli Zaretskii
2015-10-24 14:05 ` Eli Zaretskii [this message]
2015-10-25 7:19 ` Tassilo Horn
2015-10-25 8:10 ` Tassilo Horn
2015-10-25 9:25 ` Tassilo Horn
2015-10-25 18:45 ` Eli Zaretskii
2015-10-25 18:49 ` Tassilo Horn
2015-10-25 20:10 ` Stefan Monnier
2015-10-26 6:57 ` Tassilo Horn
2015-10-25 18:43 ` Eli Zaretskii
2015-10-24 12:46 ` Tassilo Horn
2015-10-25 14:43 ` Artur Malabarba
2015-10-25 18:50 ` Eli Zaretskii
2015-10-26 0:27 ` Artur Malabarba
2015-10-26 3:32 ` Eli Zaretskii
2015-10-26 13:43 ` Tassilo Horn
2015-10-24 10:35 ` Eli Zaretskii
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