From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Maury\, Olivier" <Olivier_Maury@mentor.com>
Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: Re: stack overflow in regexp matcher with gdb
Date: Thu, 14 Nov 2013 14:31:06 -0500 [thread overview]
Message-ID: <jwveh6i7pkf.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <F1072D027E48DD4F93B3FDC2992B4961AE2753F5@EU-MBX-01.mgc.mentorg.com> (Olivier Maury's message of "Thu, 14 Nov 2013 12:10:36 +0000")
> I tried with the 24.3 version of emacs and the gdb -i=mi interface. It seems
> it works a little bit better (doesn't fail with that kind of error). However
> when I do a "next" the first one is ok but the second "next" is very slow
> and then it's ok again and then it's very slow again, etc... and from time
> to time the gdb prompt is no longer printed even though I can still enter
> gdb commands...
Hmm... performance bugs can be even worse to track down :-(
> Using gud-gdb with the 24.3 version of emacs seems even more weird as it
> doesn't show the source files I've stop in...
That's odd as well: for me it does jump to the source. `gud-gdb' should
be the "safe fallback", so please report a bug about this, providing as
much details as you can.
> looking-at(",value=\\(\".*\"\\).*?}")
Indeed, this regexp is problematic. Do you have some idea what the text
can be between the quotes?
IOW can we use (looking-at ",value=\\(\"[^\"]*\"\\).*?}") instead
(which would eliminate the backtracking), or is the a risk of the value
containing a " somewhere (and if so, how is it quoted?)?
The 24.3 code is pretty different, but I see the same kind of regexp, so
the same problem is probably present as well.
Stefan
next prev parent reply other threads:[~2013-11-14 19:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-13 11:13 stack overflow in regexp matcher with gdb Maury, Olivier
2013-11-13 19:06 ` Stefan Monnier
2013-11-14 12:10 ` Maury, Olivier
2013-11-14 19:31 ` Stefan Monnier [this message]
2013-11-15 13:19 ` Maury, Olivier
2013-11-15 14:18 ` Stefan Monnier
2013-11-15 14:48 ` Eli Zaretskii
2013-11-17 22:50 ` Stefan Monnier
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