From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r107377: * src/lisp.h: Improve comment about USE_LSB_TAG.
Date: Sat, 25 Feb 2012 05:06:13 -0500 [thread overview]
Message-ID: <jwv8vjrmdsd.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <4F488717.2060108@cs.ucla.edu> (Paul Eggert's message of "Fri, 24 Feb 2012 23:00:39 -0800")
>> What I suggest is just to take the O(N) pointer-sized entities on
>> the stack, cast them to EMACS_INT, and pass them to
>> mark_maybe_object.
> Thanks, I see now. Something like the following, then.
> Yes, that does simplify things.
Your patch doesn't look bad, but is too intrusive for 24.1.
I think for 24.1 we can install one that just does:
> for (pp = start; (void *) pp < end; pp++)
> for (i = 0; i < sizeof *pp; i += GC_POINTER_ALIGNMENT)
> - mark_maybe_pointer (*(void **) ((char *) pp + i));
> + {
> + void *p = *(void **) ((char *) pp + i);
> + mark_maybe_pointer (p);
> + #ifdef WIDE_EMACS_INT
> + mark_maybe_object (widen_to_Lisp_Object (p));
> + #endif
> + }
> }
With an appropriate comment (mostly moved from the USE_LSB_TAG comment
which can be trimmed down since the avoidance of USE_LSB_TAG on
WIDE_EMACS_INT is not performed for correctness reasons any more).
Stefan
next prev parent reply other threads:[~2012-02-25 10:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1S0EsZ-0006bE-5w@vcs.savannah.gnu.org>
2012-02-22 20:25 ` [Emacs-diffs] /srv/bzr/emacs/trunk r107377: * src/lisp.h: Improve comment about USE_LSB_TAG Stefan Monnier
2012-02-23 1:20 ` Paul Eggert
2012-02-23 3:15 ` Stefan Monnier
2012-02-23 6:31 ` Paul Eggert
2012-02-23 7:42 ` Stefan Monnier
2012-02-25 7:00 ` Paul Eggert
2012-02-25 10:06 ` Stefan Monnier [this message]
2012-02-25 19:46 ` Paul Eggert
2012-02-23 3:57 ` YAMAMOTO Mitsuharu
2012-02-23 6:28 ` Paul Eggert
2012-05-09 17:56 ` Paul Eggert
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