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Re: Dumper problems and a possible solutions
From: |
Stefan Monnier |
Subject: |
Re: Dumper problems and a possible solutions |
Date: |
Wed, 25 Jun 2014 19:05:14 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) |
>> - 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
- Re: Dumper problems and a possible solutions, (continued)
- Re: Dumper problems and a possible solutions, Stefan Monnier, 2014/06/25
- Re: Dumper problems and a possible solutions, Stefan Monnier, 2014/06/25
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/25
- Re: Dumper problems and a possible solutions, Stefan Monnier, 2014/06/25
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/25
- Re: Dumper problems and a possible solutions, Paul Eggert, 2014/06/25
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/25
- Re: Dumper problems and a possible solutions,
Stefan Monnier <=
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/25
- Re: Dumper problems and a possible solutions, Dmitry Antipov, 2014/06/25
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/26
- Re: Dumper problems and a possible solutions, Dmitry Antipov, 2014/06/26
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/26
- Re: Dumper problems and a possible solutions, Eli Zaretskii, 2014/06/26
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/26
- Re: Dumper problems and a possible solutions, Andreas Schwab, 2014/06/25
- Re: Dumper problems and a possible solutions, Samuel Bronson, 2014/06/25
- Re: Dumper problems and a possible solutions, Rich Felker, 2014/06/25