From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Rich Felker <dalias@libc.org>
Cc: Eli Zaretskii <eliz@gnu.org>, dmantipov@yandex.ru, emacs-devel@gnu.org
Subject: Re: Dumper problems and a possible solutions
Date: Wed, 25 Jun 2014 19:05:14 -0400 [thread overview]
Message-ID: <jwvzjh0r3ys.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <20140625220758.GE179@brightrain.aerifal.cx> (Rich Felker's message of "Wed, 25 Jun 2014 18:07:58 -0400")
>> - we're still talking about performing relocation of all heap references
>> during startup (not that it's a problem, of course). Maybe we don't
>> need to do it ourselves, but it still has to happen.
> Indeed. The difference is just between having to write non-portable
> code that does it manually, and having it happen automatically as
> consequences of the requirements of the C language.
The manual code would be fairly normal C code, very similar to the
mark_object routine. It shouldn't be noticeably less portable than the
current pointer<->int conversions we use for tagging purposes.
Of course, it's always nice when we can use someone else's code, but
I get the impression that to get the right behavior from the
compiler/linker/loader we may have to generate a fairly enormous C file
which will generate an enormous .o file and the resulting binary will
end up with a humongous relocation table.
Of course, only time will tell.
> My understanding is that the tagged references are using the low bits
> of otherwise-aligned pointers as flags. Is this correct? If so, then
> these are just constant offsets applied to an address, and thus they
> are still valid C address constant expressions, so they have to be
> supported.
Indeed, it might work.
Stefan
next prev parent reply other threads:[~2014-06-25 23:05 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-24 17:19 Dumper problems and a possible solutions Rich Felker
2014-06-24 19:27 ` Stefan Monnier
2014-06-24 19:40 ` Rich Felker
2014-06-24 20:24 ` Stefan Monnier
2014-06-24 21:15 ` Rich Felker
2014-06-24 21:37 ` Stefan Monnier
2014-06-25 18:03 ` Dmitry Antipov
2014-06-25 18:08 ` Rich Felker
2014-06-25 18:30 ` Dmitry Antipov
2014-06-25 18:36 ` Rich Felker
2014-06-25 18:36 ` Eli Zaretskii
2014-06-25 18:41 ` Eli Zaretskii
2014-06-26 0:16 ` Stephen J. Turnbull
2014-06-25 18:20 ` Eli Zaretskii
2014-06-25 18:32 ` Rich Felker
2014-06-25 18:49 ` Eli Zaretskii
2014-06-25 19:03 ` Rich Felker
2014-06-25 19:18 ` Eli Zaretskii
2014-06-25 19:57 ` Rich Felker
2014-06-25 20:15 ` Eli Zaretskii
2014-06-25 20:34 ` Rich Felker
2014-06-26 2:44 ` Eli Zaretskii
2014-06-26 4:28 ` Rich Felker
2014-06-26 15:02 ` Eli Zaretskii
2014-06-25 20:11 ` Stefan Monnier
2014-06-25 20:06 ` Stefan Monnier
2014-06-25 20:24 ` Rich Felker
2014-06-25 21:43 ` Stefan Monnier
2014-06-25 22:07 ` Rich Felker
2014-06-25 23:04 ` Paul Eggert
2014-06-25 23:21 ` Rich Felker
2014-06-25 23:05 ` Stefan Monnier [this message]
2014-06-25 23:19 ` Rich Felker
2014-06-26 3:02 ` Dmitry Antipov
2014-06-26 4:14 ` Rich Felker
2014-06-26 4:32 ` Dmitry Antipov
2014-06-26 11:49 ` Rich Felker
2014-06-26 15:03 ` Eli Zaretskii
2014-06-26 15:10 ` Rich Felker
2014-06-25 22:33 ` Andreas Schwab
2014-06-25 20:53 ` Samuel Bronson
2014-06-25 21:24 ` Rich Felker
2014-06-25 18:38 ` Stefan Monnier
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