Re: Note on 109327

[Dmitry Antipov]

On 07/31/2012 05:13 PM, Dan Nicolaescu wrote:

> What's the motivation for changes like:
> -  f->icon_name = Qnil;
> +  FVAR (f, icon_name) = Qnil;
> ?
>
> The new version looks more obfuscated ...

Yes. I'm always thinking about improving internal stuff, GC at first.
For me, the main motivation for BVAR, KVAR, FVAR etc. is the ability
to catch the moment when the pointer (e.g. Lisp_Object) within buffer,
or keyboard, of frame, etc. is read or written, which may be useful
to implement write barriers (see, for exmaple,
http://www.hoelzle.org/publications/write-barrier.pdf, but do not
get confused with http://en.wikipedia.org/wiki/Memory_barrier).

Dmitry