From: Alan Mackenzie <acm@muc.de>
To: xh yang <linux.xhyang@gmail.com>
Cc: 33784@debbugs.gnu.org
Subject: bug#33784: 27.0.50; some case c-backward-token-2 takes cpu more and emacs hang
Date: 18 Dec 2018 17:47:16 -0000 [thread overview]
Message-ID: <20181218174716.96822.qmail__42683.1734752797$1545155191$gmane$org@mail.muc.de> (raw)
In-Reply-To: <mailman.5878.1545108246.1284.bug-gnu-emacs@gnu.org>
Hello, xh.
In article <mailman.5878.1545108246.1284.bug-gnu-emacs@gnu.org> you wrote:
> [-- text/plain, encoding 7bit, charset: UTF-8, 117 lines --]
> follow case:
> (let ((str "#define SLOGE(...)\n
> ((void)__android_log_buf_print(LOG_ID_SYSTEM, ANDROID_LOG_ERROR, LOG_TAG,\n
> __VA_ARGS__))"))
> (with-temp-buffer
> (delay-mode-hooks (funcall 'c++-mode))
> (insert str)
> (font-lock-ensure)
> (buffer-string)
> )
> )
> execute up code, emacs will hang
Yes. The problem here is the (font-lock-ensure). This is being called
even though font-lock-mode is disabled. I think there should be a check
for this in font-lock-ensure, but there isn't.
So, yes, we have a bug here. Thanks for taking the trouble to report
it.
Incidentally, the temporary buffer created by with-temp-buffer never has
font-lock-mode enabled, and font-lock-mode is spiked so that it cannot
be enabled in such a buffer. I don't know why. Attempting to enable it
fails silently, which is probably another bug.
Incidentally[2], the delay-mode-hooks in your recipe has nothing to do
with the problem.
> In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
> of 2018-12-18 built on xhyang-ThinkPad-T470p
> Repository revision: 1691a51094d35ac4b2c311fa407c6b77eea7a105
> Repository branch: master
> Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
> System Description: Ubuntu 16.04.3 LTS
[ .... ]
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2018-12-18 17:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 4:09 bug#33784: 27.0.50; some case c-backward-token-2 takes cpu more and emacs hang xh yang
[not found] ` <mailman.5878.1545108246.1284.bug-gnu-emacs@gnu.org>
2018-12-18 17:47 ` Alan Mackenzie [this message]
[not found] ` <20181218174716.96822.qmail@mail.muc.de>
2018-12-18 18:51 ` Eli Zaretskii
2018-12-18 18:55 ` Alan Mackenzie
[not found] ` <20181218185505.GC8949@ACM>
2018-12-18 19:23 ` Eli Zaretskii
2018-12-18 21:05 ` Alan Mackenzie
2018-12-18 22:05 ` Glenn Morris
2018-12-19 19:20 ` Alan Mackenzie
2018-12-19 15:22 ` Eli Zaretskii
2018-12-20 7:18 ` bug#33784: xh yang
2018-12-20 12:53 ` bug#33784: Alan Mackenzie
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