Re: MPS: Forwording symbols

[Eli Zaretskii <eliz@gnu.org>]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: eller.helmut@gmail.com,  emacs-devel@gnu.org
> Date: Mon, 17 Jun 2024 14:15:25 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> > Hm, why do you think it writes to the data segment?  Confusing names
> >> > aside, it seems to read a value, which presumably is a pointer, adjusts
> >> > it to the new basis and then writes it back.
> >> 
> >> Becasue of this
> >> 
> >>      value += emacs_basis ();
> >> 
> >> It has dumnped pointer - basis, and now uses that value to get the
> >> pointer in the current process.
> >
> > Isn't this because the dumped data is loaded with a different base
> > address than the one with which is was dumped?
> 
> That'c correct. The same happens, with a different basis, for addresses
> in the dump. Helmut asked how I know that it writes to Emacs' data
> segment. That's from the use of emacs_basis.

My reading of the code snippet you posted is that it writes to the
same address as the one from which it read.  IOW, the value is read,
updated, and then written to the same address.  Or what did I miss?

Maybe I don't understand what you mean by "Emacs data segment" or what
is the significance of that.