From: Stefan Kangas <stefan@marxist.se>
To: Sam Varshavchik <sam.varshavchik@gmail.com>
Cc: 18134@debbugs.gnu.org
Subject: bug#18134: 24.3; Doxygen comments trigger anomalous C++ major mode behavior
Date: Mon, 7 Oct 2019 00:42:46 +0200 [thread overview]
Message-ID: <CADwFkm=6UZKRZ3zaDqiTPD0S52XGvGTrPowugw-3HruLNbti_A@mail.gmail.com> (raw)
In-Reply-To: <87ppgpiraa.fsf@octopus.email-scan.com>
found 27.0.50
thanks
Sam Varshavchik <sam.varshavchik@gmail.com> writes:
> I am seeing anomalous behavior in C++ major mode that's triggered by
> long, but not excessively long -- only a few hundred lines -- Doxygen-style
> comments.
>
> Cursor navigation at the end of the Doxygen comment block in the
> following file (just before the first typedef), and trying to add some
> additional text there, results in 3-5 seconds' worth of delays for
> nearly typed character.
>
> Highlighting the entire Doxygen comment block: M-x indent-region takes
> several minutes (!) with emacs consuming 100% CPU.
[Snipped a long C++ example file here.]
I can reproduce both issues on current master using the provided example
file.
1. Editing is very slow after the Doxygen comment block.
2. Opening the example file under "emacs -Q", pressing C-x h TAB takes
several minutes and sees the emacs process consume 100 % CPU (on one
core at least).
Using the profiler during step 2 gives me:
>- command-execute 59856 97%
> - call-interactively 59856 97%
> - funcall-interactively 59827 97%
> - c-indent-line-or-region 59820 97%
> - c-indent-region 59819 97%
> - c-guess-basic-syntax 59809 97%
> - c-beginning-of-statement-1 39327 63%
> - c-crosses-statement-barrier-p 39105 63%
> - c-backward-sws 22222 36%
> + c-beginning-of-macro 492 0%
> #<compiled 0x1579d1980ead> 1 0%
> c-literal-limits 9508 15%
> c-literal-start 6228 10%
> + c-at-macro-vsemi-p 217 0%
> + c-backward-sws 61 0%
> + c-at-macro-vsemi-p 16 0%
> + c-beginning-of-macro 10 0%
> - c-just-after-func-arglist-p 19872 32%
> - c-beginning-of-statement-1 19872 32%
> - c-crosses-statement-barrier-p 19795 32%
> - c-backward-sws 11424 18%
> + c-beginning-of-macro 287 0%
> #<compiled 0x1579d1980ead> 2 0%
> c-literal-limits 4707 7%
> c-literal-start 3095 5%
> + c-at-macro-vsemi-p 121 0%
> + c-backward-sws 17 0%
> c-beginning-of-macro 2 0%
> c-at-macro-vsemi-p 1 0%
> + c-looking-at-inexpr-block 1 0%
> + c-backward-sws 202 0%
> + c-back-over-member-initializers 106 0%
> + c-determine-limit 103 0%
> + c-parse-state 61 0%
> + c-looking-at-decl-block 55 0%
> + c-looking-at-inexpr-block 19 0%
> + c-syntactic-skip-backward 13 0%
> + c-back-over-member-initializer-braces 4 0%
> + c-beginning-of-decl-1 4 0%
> + c-in-literal 3 0%
> + c-at-macro-vsemi-p 1 0%
> + c-inside-bracelist-p 1 0%
> + c-at-statement-start-p 1 0%
> + c-indent-line 9 0%
> + execute-extended-command 7 0%
> - byte-code 29 0%
> + read-extended-command 29 0%
>+ ... 1784 2%
(Quoted above so Gmail doesn't mess it up...)
Best regards,
Stefan Kangas
next prev parent reply other threads:[~2019-10-06 22:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-28 12:47 bug#18134: 24.3; Doxygen comments trigger anomalous C++ major mode behavior Sam Varshavchik
2019-10-06 22:42 ` Stefan Kangas [this message]
2019-10-07 18:51 ` Alan Mackenzie
2019-10-07 19:04 ` Stefan Kangas
2019-10-19 16:13 ` Alan Mackenzie
2019-10-20 13:36 ` Stefan Kangas
2019-10-20 17:04 ` Alan Mackenzie
2019-10-20 23:12 ` Sam Varshavchik
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