From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Noam Postavsky <npostavs@users.sourceforge.net>
Cc: John Wiegley <jwiegley@gmail.com>, Eli Zaretskii <eliz@gnu.org>,
emacs-devel@gnu.org
Subject: Re: Lisp watchpoints
Date: Sun, 29 Nov 2015 17:24:46 -0500 [thread overview]
Message-ID: <jwv1tb8qwef.fsf-monnier+Inbox@gnu.org> (raw)
In-Reply-To: <CAM-tV-8jgC6yZeU9_XtYb5e683quiZ4ZSETD6oiyZf34-uNyMg@mail.gmail.com> (Noam Postavsky's message of "Sun, 29 Nov 2015 11:04:23 -0500")
>> The let-binding is currently trapped, but not the corresponding
>> unbinding. Is it better to skip both? As far as I can tell, it's not
>> feasible to trap the unbinding.
The unbinding currently doesn't check CONSTANT_P, but that's just an
optimization that becomes invalid for trapped variables. I don't see
why we couldn't trap the unbinding just like we trap the binding (at
the cost of an extra check of the `trapped' attribute).
In terms of debugging, I think trapping let-binding and let-unbinding is
definitely useful, so I think it's worth the effort to try and catch
both cases.
> I should clarify that this only applies to dynamically-bound
> variables, lexical variables are never trapped.
Yes, that's normal and right. Fundamentally, lexical variables are
anonymous, anyway.
Stefan
next prev parent reply other threads:[~2015-11-29 22:24 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-14 18:14 Lisp watchpoints (Was: [Emacs-diffs] master 19e09cf: Ensure redisplay after evaluation) Noam Postavsky
2015-11-14 22:29 ` Lisp watchpoints Stefan Monnier
2015-11-22 20:13 ` Noam Postavsky
2015-11-22 20:41 ` Eli Zaretskii
2015-11-22 21:25 ` Stefan Monnier
2015-11-23 3:32 ` Eli Zaretskii
2015-11-23 2:31 ` Noam Postavsky
2015-11-29 2:04 ` Noam Postavsky
2015-11-29 4:44 ` Stefan Monnier
2015-11-29 5:12 ` Noam Postavsky
2015-11-29 11:28 ` Andreas Schwab
2015-11-29 14:12 ` Noam Postavsky
2015-11-29 15:37 ` Stefan Monnier
2015-11-29 16:10 ` Eli Zaretskii
2015-11-30 0:57 ` Noam Postavsky
2015-11-30 1:14 ` Stefan Monnier
2015-11-30 15:49 ` Eli Zaretskii
2015-11-29 11:28 ` Andreas Schwab
2015-11-29 15:39 ` Stefan Monnier
2015-11-29 15:45 ` Eli Zaretskii
2015-11-29 16:01 ` Noam Postavsky
2015-11-29 16:04 ` Noam Postavsky
2015-11-29 17:13 ` Eli Zaretskii
2015-11-29 22:24 ` Stefan Monnier [this message]
2015-11-29 17:11 ` Eli Zaretskii
2015-11-29 16:06 ` Stefan Monnier
2015-11-29 16:43 ` Eli Zaretskii
2015-11-29 19:40 ` Noam Postavsky
2015-11-29 19:54 ` Eli Zaretskii
2015-11-29 20:35 ` Noam Postavsky
2015-11-29 20:45 ` Eli Zaretskii
2015-11-29 21:33 ` Noam Postavsky
2015-11-29 20:00 ` Andreas Schwab
2015-11-29 20:19 ` Eli Zaretskii
-- strict thread matches above, loose matches on Subject: below --
2016-12-03 14:51 Kaushal Modi
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