--- Begin Message ---
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Subject: |
26.0.91; CC-Mode: Major slowdown when isearching big C++ file. |
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Date: |
Tue, 06 Feb 2018 11:34:43 +0100 |
After updating CC-Mode to the latest version in the standalone mercurial
repository I noticed that searching large C++ files has become a lot
slower than before (factor 20 or so). I traced the problem back to this
commit:
Author: Alan Mackenzie <address@hidden>
Date: Sun Jan 21 18:05:41 2018 +0000
Handle C99 Compound Literals in return statements and argument lists.
* cc-engine.el (c-looking-at-or-maybe-in-bracelist): Recognize a brace list
when preceded by "return" or inside parentheses, either immediately after
the
"(" or following a comma.
(c-looking-at-inexpr-block): Test c-has-compound-literals rather than hard
coded C++ Mode.
(c-guess-basic-syntax, CASE 7B): Test additionally for not being just
inside a
parenthesis or being at a Java "new" keyword. CASE 9: Remove the simple
minded test on the contents of a block to determine a brace list.
* cc-langs.el (c-has-compound-literals): New lang const and lang var.
* bracelist-30.{c,res}: New test files.
I am attaching the result of a run of the emacs profiler before
("fast.profile") and after the commit ("slow.profile"). In this run I
started emacs as:
emacs -Q /path/to/big/file.C -e "(add-to-list 'load-path ~/cc-mode)" -e
"(require 'cc-mode)"
M-x profiler-start
C-s searchString
M-x profiler-report
And write the result to 'slow.profile' and 'fast.profile'
respectively. It appears that 93% of the time is spent in
c-looking-at-or-maybe-in-bracelist.
Thanks for looking into this issue!
In GNU Emacs 26.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.26)
of 2018-02-06 built on beischer-w520
Repository revision: c787a4968273027960a20ced6d63bae0d1ffa87e
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
Recent messages:
Checking 105 files in /usr/share/emacs/26.0.91/lisp/obsolete...
Checking for load-path shadows...done
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Configured using:
'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
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--with-sound=alsa --with-xft --with-modules --with-x-toolkit=gtk3
--without-gconf --without-gsettings --without-gpm --without-m17n-flt
--with-xwidgets --without-compress-install 'CFLAGS=-march=native -O2
-pipe -fstack-protector-strong -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
Configured features:
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LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 MODULES
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/home/beischer/.emacs.d/elpa/org-20180205/ob-stan hides
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Memory information:
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--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#30367: 26.0.91; CC-Mode: Major slowdown when isearching big C++ file. |
|
Date: |
Tue, 20 Mar 2018 18:49:47 +0000 |
|
User-agent: |
Mutt/1.7.2 (2016-11-26) |
Hello, Bastian.
On Fri, Feb 09, 2018 at 10:16:53 +0100, Bastian Beischer wrote:
> Hello Alan,
> Alan Mackenzie <address@hidden> writes:
[ .... ]
> > Would you please try out the following patch on real code, and either
> > confirm to me that it fixes the bug, or tell me what it breaks. Thanks!
> > diff -r e8b2c6141f97 cc-engine.el
> > --- a/cc-engine.el Fri Feb 02 20:34:15 2018 +0000
> > +++ b/cc-engine.el Thu Feb 08 18:39:40 2018 +0000
> > @@ -10547,13 +10547,6 @@
> > (looking-at c-return-key))
> > (setq braceassignp t)
> > nil)
> > - ((and c-has-compound-literals
> > - (eq (char-after) ?,))
> > - (save-excursion
> > - (when (and (c-go-up-list-backward nil lim)
> > - (eq (char-after) ?\())
> > - (setq braceassignp t)
> > - nil)))
> > ((eq (char-after) ?=)
> > ;; We've seen a =, but must check earlier tokens so
> > ;; that it isn't something that should be ignored.
> > [ .... ]
> Yes, this patch fixes the slowdown. But since I don't understand what
> the original commit which introduced the slowdown tried to fix I cannot
> comment on whether or not its the right thing to do within the context
> of that commit.
Thanks for the prompt, positive reply. I'm afraid I can't remember
either, what the original patch was for.
> I will run emacs with the patch included for a while and will let you
> know in case I find any problems!
Nothing heard from you in the meantime. Good!
> Thanks for tackling this so quickly!
Sorry I've not maintained this speed in committing it. I have now
committed the fix, in revision 16559146f9db1b36d5e8b6c92edb5bb36fafdb85,
and I'm closing the bug.
> >> > Cheers
> >> > Bastian
--
Alan Mackenzie (Nuremberg, Germany).
--- End Message ---