From: Richard Stallman <rms@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Alignment of Lisp_Subr
Date: Wed, 12 Nov 2003 21:40:22 -0500 [thread overview]
Message-ID: <E1AK7PC-0001dq-PS@fencepost.gnu.org> (raw)
In-Reply-To: <jwv8ymld1jm.fsf-monnier+emacs/devel@vor.iro.umontreal.ca> (message from Stefan Monnier on 12 Nov 2003 11:22:33 -0500)
- Structures of type Lisp_Subr are statically allocated and are not
guaranteed to be aligned on a multiple of 8. I currently solve this
by adding __attributes__ ((__aligned__ (8))), but this only works for GCC
AFAIK. The only alternative I can think of is to add a padding field
to Lisp_Subr and when its address is not a multiple of 8, memmove it
by a few bytes (I think `defsubr' is the only place where we refer
to these statically allocated Sfoo variables).
Any comment on which approach is preferable ?
Subr objects are allocated statically, but I don't think anything
requires that. There is no harm in copying the data to some new,
properly-aligned block of memory and using that block instead.
prev parent reply other threads:[~2003-11-13 2:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-12 16:22 Alignment of Lisp_Subr Stefan Monnier
2003-11-12 23:30 ` Miles Bader
2003-11-13 16:18 ` Stephen J. Turnbull
2003-11-14 5:23 ` Gaute B Strokkenes
2003-11-14 11:28 ` Stephen J. Turnbull
2003-11-16 10:25 ` Gaute B Strokkenes
2003-11-13 2:40 ` Richard Stallman [this message]
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