From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Dmitry Antipov <dmantipov@yandex.ru>, 12215@debbugs.gnu.org
Subject: bug#12215: CSET is unnecessarily confusing
Date: Thu, 23 Aug 2012 07:40:43 -0700 [thread overview]
Message-ID: <503640EB.5030901@cs.ucla.edu> (raw)
In-Reply-To: <jwvmx1lu7d5.fsf-monnier+emacs@gnu.org>
On 08/23/2012 05:26 AM, Stefan Monnier wrote:
> One choice is to have a flag in the object (like gcmarkbit)
> that says "this object was modified since last scan";
> and for that you need a pointer to the
> start of the object rather than only to the field.
If that flag has a standard name, one doesn't
need separate macros BSET/CSET/etc; one can have just
one macro that works for all types.
> there are also many other choices which don't require such
> a pointer (e.g. you can add the field's address to a list of "modified
> fields"; or you can have a flag covering all objects in a "page", ...).
Or one can rely on the hardware's memory-mapping facilities;
by making the page readonly until some code writes to it.
This would mean we don't need a setter macro.
It'd be nicer from the Emacs maintenance
point of view, most code could chug along
in the traditional way. That is, we apply the
<http://bugs.gnu.org/12215#34> patch to the trunk to get
rid of the setters, and create a gc branch that uses mmap
rather than reintroducing lots of changes to add calls to a
setter macro or macros.
next prev parent reply other threads:[~2012-08-23 14:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-17 0:04 bug#12215: CSET is unnecessarily confusing Paul Eggert
2012-08-17 4:12 ` Dmitry Antipov
2012-08-21 16:55 ` Stefan Monnier
2012-08-22 3:25 ` Paul Eggert
2012-08-22 13:27 ` Stefan Monnier
2012-08-22 16:35 ` Paul Eggert
2012-08-22 16:50 ` Dmitry Antipov
2012-08-23 7:02 ` Paul Eggert
2012-08-23 12:26 ` Stefan Monnier
2012-08-23 14:40 ` Paul Eggert [this message]
2012-08-24 3:46 ` Chong Yidong
2012-08-24 3:57 ` Paul Eggert
2012-08-24 4:26 ` Dmitry Antipov
2012-08-24 15:10 ` Stefan Monnier
2012-08-24 17:19 ` Paul Eggert
2012-08-24 17:27 ` Tom Tromey
2012-08-24 18:11 ` Paul Eggert
2012-08-24 21:12 ` Stefan Monnier
2012-08-25 0:17 ` Paul Eggert
2012-08-25 1:58 ` Stefan Monnier
2012-08-26 5:05 ` Paul Eggert
2012-08-21 17:55 ` Stefan Monnier
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