all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 65051@debbugs.gnu.org, acm@muc.de
Subject: bug#65051: internal_equal manipulates symbols with position without checking symbols-with-pos-enabled.
Date: Fri, 4 Aug 2023 14:59:58 +0000	[thread overview]
Message-ID: <ZM0SbuxDgtezf7tc@ACM> (raw)
In-Reply-To: <83leeqvpx8.fsf@gnu.org>

Hello, Eli.

On Fri, Aug 04, 2023 at 17:32:35 +0300, Eli Zaretskii wrote:
> > Date: Fri, 4 Aug 2023 14:00:29 +0000
> > From: Alan Mackenzie <acm@muc.de>

> > Hello, Emacs.

> > The code in question is in internal_equal (src/fns.c) ~37 lines from its
> > start.  We have:

> >   if (SYMBOL_WITH_POS_P (o1))
> >     o1 = SYMBOL_WITH_POS_SYM (o1);
> >   if (SYMBOL_WITH_POS_P (o2))
> >     o2 = SYMBOL_WITH_POS_SYM (o2);

> > at the top level of the function.  Thus

> >     (equal 'foo #<symbol foo at 42>)

> > will return non-nil, regardless of the setting of
> > symbols-with-pos-enabled.  It should return non-nil only when that flag
> > variable is non-nil.  This is a bug.

> > #########################################################################

> > A simple fix is:

> What will happen to the comparison in internal_equal when
> symbols_with_pos_enabled is zero and the two objects have different
> positions, or one has a position, the other doesn't?

In these cases, equal will return nil.  This is correct.

In the other case, when two symbols with position have the same base
symbol and the same position, yet aren't identical, this will also return
nil, which is incorrect.  Do you think this case is worth bothering
about?  It could easily be amended.

> And which branch are you proposing this change for?

master.  It doesn't seem important enough for the release branch.

-- 
Alan Mackenzie (Nuremberg, Germany).





  reply	other threads:[~2023-08-04 14:59 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-04 14:00 bug#65051: internal_equal manipulates symbols with position without checking symbols-with-pos-enabled Alan Mackenzie
2023-08-04 14:32 ` Eli Zaretskii
2023-08-04 14:59   ` Alan Mackenzie [this message]
2023-08-04 15:27     ` Eli Zaretskii
2023-08-04 17:06       ` Alan Mackenzie
2023-08-04 18:01         ` Eli Zaretskii
2023-08-05 10:45           ` Alan Mackenzie
2023-08-05 10:57             ` Eli Zaretskii
2023-08-05 11:52               ` Alan Mackenzie
2023-08-05 12:13                 ` Eli Zaretskii
2023-08-05 13:04                   ` Alan Mackenzie
2023-08-05 13:13                     ` Eli Zaretskii
2023-08-13 16:14                       ` Alan Mackenzie
2023-08-05 14:40 ` Mattias Engdegård
2023-08-05 16:59   ` Alan Mackenzie
2023-08-05 17:02     ` Mattias Engdegård
2023-08-05 21:07   ` Alan Mackenzie
2023-08-06 13:37     ` Mattias Engdegård
2023-08-06 15:02       ` Alan Mackenzie
2023-08-07  8:58         ` Mattias Engdegård
2023-08-07  9:44           ` Alan Mackenzie
2023-08-09 18:45             ` Mattias Engdegård
2023-08-07  3:30 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-07  9:20   ` Alan Mackenzie
2023-08-08  2:56     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-08 15:33       ` Alan Mackenzie
2023-08-10  3:28         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-10  9:14           ` Alan Mackenzie
2023-08-10 14:28             ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-10 18:35               ` Alan Mackenzie
2023-08-12  5:36                 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-12  6:10                   ` Eli Zaretskii
2023-08-12 18:46                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-12 19:10                       ` Eli Zaretskii
2023-08-13 15:27                       ` Alan Mackenzie
2023-08-12 10:41                   ` Alan Mackenzie
2023-08-12 18:07                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-13 13:52                       ` Alan Mackenzie
2023-08-12 21:59                   ` Alan Mackenzie
2023-08-11  0:51         ` Dmitry Gutov
2023-08-11 10:42           ` Alan Mackenzie
2023-08-11 11:18             ` Dmitry Gutov
2023-08-11 12:05               ` Alan Mackenzie
2023-08-11 13:19                 ` Dmitry Gutov
2023-08-11 14:04                   ` Alan Mackenzie
2023-08-11 18:15                     ` Dmitry Gutov
     [not found] ` <handler.65051.B.169115764532326.ack@debbugs.gnu.org>
2023-09-04 12:57   ` bug#65051: Acknowledgement (internal_equal manipulates symbols with position without checking symbols-with-pos-enabled.) Alan Mackenzie

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ZM0SbuxDgtezf7tc@ACM \
    --to=acm@muc.de \
    --cc=65051@debbugs.gnu.org \
    --cc=eliz@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.