From: Lars Ingebrigtsen <larsi@gnus.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Juanma Barranquero <lekktu@gmail.com>, sds@gnu.org, emacs-devel@gnu.org
Subject: Re: more candidates for obsoletion
Date: Tue, 04 Sep 2012 20:10:06 +0200 [thread overview]
Message-ID: <87mx15oe0x.fsf@gnus.org> (raw)
In-Reply-To: <jwv62bzldb8.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Sun, 13 May 2012 22:20:36 -0400")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> static void
>> set_message (const char *s, Lisp_Object string,
>> EMACS_INT nbytes, int multibyte_p)
>> {
>> + int count = SPECPDL_INDEX ();
>> +
>> message_enable_multibyte
>> = ((s && multibyte_p)
>> || (STRINGP (string) && STRING_MULTIBYTE (string)));
>> @@ -10420,6 +10431,19 @@
>> (intptr_t) s, string, nbytes, multibyte_p);
>> message_buf_print = 0;
>> help_echo_showing_p = 0;
>> +
>> + record_unwind_save_match_data ();
>> +
>> + if (! debugging &&
>> + ! NILP (Vdebug_on_message) &&
>> + STRINGP (Vdebug_on_message) &&
>> + ! NILP (Fstring_match (Vdebug_on_message, string, Qnil))) {
>> + debugging = 1;
>> + record_unwind_protect (undo_debugging, Qnil);
>> + call_debugger (Fcons (Qerror, Fcons (string, Qnil)));
>> + }
>> +
>> + unbind_to (count, Qnil);
>> }
(I'm including the patch again, since it's been years since it was last
seen. Or something. :-)
> Doesn't look too bad. A few questions and suggestions:
> - !NILP is implied y STRINGP.
> - You might prefer to use fast_string_match.
Fixed and fixed. And then I don't have to save the match data either, I
guess?
> - Is the recursive debugging a problem you've found to show up
> unavoidably all the time, or are you just being cautious?
It is a real problem. My first test case used a string that the
debugger used, too, so Emacs went into an infinite debugging loop...
> - You could turn your `debugging' into a Lisp var (call it
> "inhibit-debug-on-message"), or you could let-bind debug-on-message to
> nil around the call to the debugger.
Sounds good. I've had a peek around the sources, but I can't quite see
how to let-bind something from C. What should I be looking for as an
example?
--
(domestic pets only, the antidote for overdose, milk.)
http://lars.ingebrigtsen.no * Sent from my Emacs
next prev parent reply other threads:[~2012-09-04 18:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-01 6:43 more candidates for obsoletion Glenn Morris
2012-05-01 19:51 ` Sam Steingold
2012-05-01 22:06 ` Juanma Barranquero
2012-05-01 22:25 ` Lars Magne Ingebrigtsen
2012-05-01 22:28 ` Lars Magne Ingebrigtsen
2012-05-02 13:02 ` Stefan Monnier
2012-05-13 18:34 ` Lars Magne Ingebrigtsen
2012-05-14 2:20 ` Stefan Monnier
2012-09-04 18:10 ` Lars Ingebrigtsen [this message]
2012-09-04 19:29 ` Stefan Monnier
2012-09-04 21:24 ` Lars Ingebrigtsen
2012-05-02 5:03 ` Thierry Volpiatto
2012-05-02 9:25 ` Michael Albinus
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