From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Daniel Mendler <mail@daniel-mendler.de>
Cc: 63253@debbugs.gnu.org
Subject: bug#63253: 29.0.90; with-delayed-message fails in combination with inhibit-message
Date: Mon, 08 May 2023 09:54:35 -0400 [thread overview]
Message-ID: <jwvpm7bnf0q.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87r0rxdwc8.fsf@daniel-mendler.de> (Daniel Mendler's message of "Wed, 03 May 2023 21:54:47 +0200")
> There seems to exist an interaction issue of `with-delayed-message' with
> `inhibit-message'.
Very much so, indeed. The issue is fundamentally linked to
`set-message-function`:
`with-delayed-message` calls `message3` (via
`with_delayed_message_display`) from an "atimer", i.e. a thing that can
be run from `process_pending_signals`, `unblock_input`, `maybe_quit`, ...
AFAIK these are places where it's safe to run some C code, but not
places where it's safe to run arbitrary ELisp code.
So `set-message-function` is "dangerous" because it runs ELisp code from
`message3` => `message3_nolog` => `set_message`.
I think this is related to bug#58042.
Here the problem is that the regexp engine is stateful, so calling
a regexp function in the middle of another regexp match causes serious
problems. When we need to run ELisp from a regexp match for
on-the-fly syntax-propertization (in `parse_sexp_propertize`), we're
careful to try and detect if the ELisp code may have modified the
current buffer and we re-set the `gl_state` with a call to
`SETUP_SYNTAX_TABLE`.
But when `with-delayed-message' performs a regexp operation from within
another regexp match, it doesn't re-set the `gl_state`, which then leads
to this "Error in syntax_table logic for to-the-end intervals" error.
I'm surprised we haven't yet seen the same problem when the ELisp code is
run via things like -[EmacsView layoutSublayersOfLayer:] which can be
called from `maybe_quit` and call `redisplay` which in turn can run
arbitrary ELisp code (via `mode-line-format`, jit-lock, you name it).
Stefan
next prev parent reply other threads:[~2023-05-08 13:54 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-03 19:54 bug#63253: 29.0.90; with-delayed-message fails in combination with inhibit-message Daniel Mendler
2023-05-04 5:21 ` Eli Zaretskii
2023-05-04 22:13 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-08 13:54 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2023-05-08 14:55 ` Eli Zaretskii
2023-05-08 15:13 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-08 16:06 ` Eli Zaretskii
2023-05-10 2:31 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-10 11:16 ` Eli Zaretskii
2023-05-10 15:15 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-10 15:50 ` Eli Zaretskii
2023-05-11 15:00 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-11 15:55 ` Eli Zaretskii
2023-05-08 15:18 ` Eli Zaretskii
2023-05-08 15:27 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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