From: "Gerd Möllmann" <gerd.moellmann@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: pipcet@protonmail.com, 75322@debbugs.gnu.org
Subject: bug#75322: SAFE_ALLOCA assumed to root Lisp_Objects/SSDATA(string)
Date: Sun, 05 Jan 2025 20:02:22 +0100 [thread overview]
Message-ID: <m21pxht77l.fsf@gmail.com> (raw)
In-Reply-To: <86ldvp6r1e.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 05 Jan 2025 20:42:37 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Gerd Möllmann <gerd.moellmann@gmail.com>
>> Cc: pipcet@protonmail.com, 75322@debbugs.gnu.org
>> Date: Sun, 05 Jan 2025 18:49:56 +0100
>>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> > This surprises me because on the master branch SAFE_ALLOCA_LISP either
>> > calls alloca or xzalloc. So I don't see why SAFE_ALLOCA_LISP would be
>> > safer in the old GC than SAFE_NALLOCA. It's only on the igc branch
>> > that you made SAFE_ALLOCA_LISP make a Lisp vector.
>> > But this is a tangent from my POV. I would like to discuss the new
>> > GC, not the old one.
>> >
>>
>> This in SAFE_ALLOCA_LISP_EXTRA
>>
>> (buf) = xzalloc (alloca_nbytes); \
>> record_unwind_protect_array (buf, nelt); \
>>
>> makes a specpdl entry, which makes mark_specpdl do this:
>>
>> case SPECPDL_UNWIND_ARRAY:
>> mark_objects (pdl->unwind_array.array, pdl->unwind_array.nelts);
>> break;
>
> Thanks. I guess it's supposed to be "common knowledge" that
> record_unwind_protect_* indirectly causes the objects to be marked...
>
> But then why don't we set the .mark member in SAFE_NALLOCA or some
> variant thereof?
Questions upon questions. I have no idea. It seems to be relatively
new, i.e. younger than 20 years :-).
next prev parent reply other threads:[~2025-01-05 19:02 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-03 17:20 bug#75322: SAFE_ALLOCA assumed to root Lisp_Objects/SSDATA(string) Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-03 19:55 ` Gerd Möllmann
2025-01-03 20:34 ` Gerd Möllmann
2025-01-03 20:48 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-04 4:40 ` Gerd Möllmann
2025-01-04 7:57 ` Eli Zaretskii
2025-01-04 8:47 ` Gerd Möllmann
2025-01-04 9:56 ` Eli Zaretskii
2025-01-04 10:20 ` Gerd Möllmann
2025-01-05 13:30 ` Eli Zaretskii
2025-01-05 14:11 ` Gerd Möllmann
2025-01-05 17:45 ` Eli Zaretskii
2025-01-05 18:17 ` Gerd Möllmann
2025-01-05 19:07 ` Eli Zaretskii
2025-01-05 20:04 ` Gerd Möllmann
2025-01-05 20:24 ` Eli Zaretskii
2025-01-06 3:57 ` Gerd Möllmann
2025-01-06 8:25 ` Gerd Möllmann
2025-01-06 14:07 ` Eli Zaretskii
2025-01-05 21:15 ` Daniel Colascione
2025-01-06 12:59 ` Eli Zaretskii
2025-01-06 14:48 ` Daniel Colascione
2025-01-06 15:12 ` Eli Zaretskii
2025-01-06 15:27 ` Daniel Colascione
2025-01-05 21:01 ` Daniel Colascione
2025-01-05 23:28 ` Daniel Colascione
2025-01-06 13:26 ` Eli Zaretskii
2025-01-06 15:08 ` Daniel Colascione
2025-01-06 4:23 ` Gerd Möllmann
2025-01-04 11:41 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-04 11:29 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-04 12:17 ` Gerd Möllmann
2025-01-04 7:00 ` Eli Zaretskii
2025-01-04 7:17 ` Gerd Möllmann
2025-01-04 8:23 ` Eli Zaretskii
2025-01-04 8:58 ` Gerd Möllmann
2025-01-04 11:08 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-04 13:47 ` Eli Zaretskii
2025-01-04 14:13 ` Gerd Möllmann
2025-01-04 15:26 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-04 15:34 ` Gerd Möllmann
2025-01-04 18:19 ` Eli Zaretskii
2025-01-04 18:35 ` Gerd Möllmann
2025-01-04 19:10 ` Eli Zaretskii
2025-01-04 19:24 ` Gerd Möllmann
2025-01-04 18:02 ` Eli Zaretskii
2025-01-04 19:32 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-04 20:31 ` Eli Zaretskii
2025-01-04 21:15 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-05 8:23 ` Eli Zaretskii
2025-01-05 9:04 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-05 9:32 ` Eli Zaretskii
2025-01-05 9:47 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-05 11:04 ` Eli Zaretskii
2025-01-06 15:54 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-06 19:16 ` Gerd Möllmann
2025-01-08 3:46 ` Gerd Möllmann
2025-01-05 6:32 ` Gerd Möllmann
2025-01-05 6:59 ` Gerd Möllmann
2025-01-05 10:21 ` Eli Zaretskii
2025-01-05 10:30 ` Gerd Möllmann
2025-01-05 10:35 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-05 10:45 ` Gerd Möllmann
2025-01-05 11:29 ` Eli Zaretskii
2025-01-05 11:37 ` Gerd Möllmann
2025-01-05 12:15 ` Eli Zaretskii
2025-01-05 13:21 ` Gerd Möllmann
2025-01-05 17:31 ` Eli Zaretskii
2025-01-05 17:49 ` Gerd Möllmann
2025-01-05 18:42 ` Eli Zaretskii
2025-01-05 19:02 ` Gerd Möllmann [this message]
2025-01-05 7:48 ` Eli Zaretskii
2025-01-05 8:19 ` Gerd Möllmann
2025-01-05 10:33 ` Eli Zaretskii
2025-01-05 10:40 ` Gerd Möllmann
2025-01-05 11:21 ` Pip Cet via Bug reports for GNU Emacs, the Swiss army knife of text editors
2025-01-05 11:27 ` Gerd Möllmann
2025-01-05 11:49 ` Paul Eggert
2025-01-06 6:26 ` Gerd Möllmann
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