From: Helmut Eller <eller.helmut@gmail.com>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>
Cc: Eli Zaretskii <eliz@gnu.org>, Paul Eggert <eggert@cs.ucla.edu>,
pipcet@protonmail.com, emacs-devel@gnu.org
Subject: Re: MPS: assertion failed: header_type (h) != IGC_OBJ_FWD
Date: Tue, 16 Jul 2024 16:19:30 +0200 [thread overview]
Message-ID: <87msmhwhal.fsf@gmail.com> (raw)
In-Reply-To: <m2y161xxch.fsf@pro2.fritz.box> ("Gerd Möllmann"'s message of "Tue, 16 Jul 2024 15:47:26 +0200")
On Tue, Jul 16 2024, Gerd Möllmann wrote:
> That's probably a misunderstanding. I'm thinking about a block of memory
> containing references, and the alignment of these references, not the
> alignment of the block.
>
> Example with sizeof(int) = 4, and sizeof(void *) = 8
>
> struct x
> {
> int x;
> struct Lisp_Symbol *s;
> };
>
> What about the offset of x::s?
That's not a problem because offsetof(struct x, s) = 8. There are 4
bytes padding after x. A problem could be if an unaligned void* is cast
to a struct Lisp_Symbol*; let's hope that nobody does that.
next prev parent reply other threads:[~2024-07-16 14:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-14 4:12 MPS: assertion failed: header_type (h) != IGC_OBJ_FWD Gerd Möllmann
2024-07-14 5:30 ` Pip Cet
2024-07-14 7:00 ` Gerd Möllmann
2024-07-14 7:08 ` Gerd Möllmann
2024-07-16 13:02 ` Gerd Möllmann
2024-07-16 13:38 ` Eli Zaretskii
2024-07-16 13:47 ` Gerd Möllmann
2024-07-16 14:11 ` Eli Zaretskii
2024-07-16 14:39 ` Gerd Möllmann
2024-07-16 15:21 ` Eli Zaretskii
2024-07-16 16:54 ` Gerd Möllmann
2024-07-16 14:19 ` Helmut Eller [this message]
2024-07-16 14:48 ` Gerd Möllmann
2024-07-16 15:22 ` Eli Zaretskii
2024-07-16 16:13 ` Pip Cet
2024-07-16 16:47 ` Gerd Möllmann
2024-07-17 7:51 ` Andrea Corallo
2024-07-17 19:47 ` Gerd Möllmann
2024-07-18 15:08 ` Gerd Möllmann
2024-07-18 16:05 ` Pip Cet
2024-07-18 16:33 ` Gerd Möllmann
2024-07-18 19:06 ` Andrea Corallo
2024-07-18 19:33 ` Gerd Möllmann
2024-07-19 4:38 ` Gerd Möllmann
2024-07-23 0:36 ` Pip Cet
2024-07-23 3:31 ` Gerd Möllmann
2024-07-16 15:49 ` Paul Eggert
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