From: Rich Felker <dalias@libc.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
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 19:19:45 -0400 [thread overview]
Message-ID: <20140625231945.GF179@brightrain.aerifal.cx> (raw)
In-Reply-To: <jwvzjh0r3ys.fsf-monnier+emacs@gnu.org>
On Wed, Jun 25, 2014 at 07:05:14PM -0400, Stefan Monnier wrote:
> >> - 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.
For non-PIE emacs, the relocations would only exist in the .o file,
which would only be "enormous" to the extent that the actual data is
(IIRC roughly 11 megs for 32-bit and 16 megs for 64-bit). For PIE,
the relocations are carried over to the executable, but they're all
relative (not symbolic) and thus trivial from a performance
standpoint.
Rich
next prev parent reply other threads:[~2014-06-25 23:19 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
2014-06-25 23:19 ` Rich Felker [this message]
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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