From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Marty Rosenberg <marty.rosenberg@gmail.com>, 18022@debbugs.gnu.org
Subject: bug#18022: 24.3; Emacs hard locks when attempting to do a replacement with ^M in it.
Date: Wed, 16 Jul 2014 21:41:44 +0000 [thread overview]
Message-ID: <20140716214144.GA4052@acm.acm> (raw)
In-Reply-To: <8338e28t9r.fsf@gnu.org>
Hello, Marty and Eli.
On Tue, Jul 15, 2014 at 07:46:08PM +0300, Eli Zaretskii wrote:
> > Date: Tue, 15 Jul 2014 12:28:10 -0400
> > From: Marty Rosenberg <marty.rosenberg@gmail.com>
> > Oh. I also opened a new file called "test.cc". I think that cc-mode is part
> > of the issue.
> Yes, that makes the difference.
> Alan, can you take a look?
OK, I've made some progress. Just to be specific what the problem is:
When in 64-bit Gnu/Linux, a C++ file is exactly this (where ^M is a
carriage return)
template <bool b>^MSimulatorBase<b>::foobar()
(there being no newline at EOB), font-locking hangs, though hitting a
frame changing command followed by C-g often enough will switch frames.
With the help of elp-instrument-package RET c- RET, it is apparent that
c-beginning-of-macro is being called in a loop. By putting this at the
start of c-beginning-of-macro:
(message "1. %s" (backtrace-frame 1))
(message "2. %s" (backtrace-frame 2))
(message "3. %s" (backtrace-frame 3))
(message "4. %s" (backtrace-frame 4))
(message "5. %s" (backtrace-frame 5))
(message "6. %s" (backtrace-frame 6))
(message "7. %s" (backtrace-frame 7))
(message "8. %s" (backtrace-frame 8))
(message "9. %s" (backtrace-frame 9))
(message "a. %s" (backtrace-frame 10))
(message "b. %s" (backtrace-frame 11))
(message "c. %s" (backtrace-frame 12))
, it becomes clear that the looping is in c-backward-sws, the function
generated by macro c-backward-syntactic-ws, which is being called from
c-font-lock-<>-arglists.
I don't know c-backward-sws very well, but it looks like that's about to
change. ;-)
Marty, thanks for such a high quality bug report.
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2014-07-16 21:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-15 3:13 bug#18022: 24.3; Emacs hard locks when attempting to do a replacement with ^M in it Marty Rosenberg
2014-07-15 14:19 ` Eli Zaretskii
[not found] ` <CAGv7PEAuRvfarf=Lumi-x-S2UCiK-29=DfET1On6jpyBX1y9=w@mail.gmail.com>
2014-07-15 16:46 ` Eli Zaretskii
2014-07-16 21:41 ` Alan Mackenzie [this message]
2014-07-19 20:33 ` Alan Mackenzie
2014-07-23 18:41 ` Alan Mackenzie
[not found] ` <20140723184146.GA2969@acm.acm>
2014-07-25 22:23 ` Stefan Monnier
2014-10-04 18:38 ` Alan Mackenzie
[not found] ` <20141004183822.GA3144@acm.acm>
2014-10-04 22:31 ` Stefan Monnier
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