Re: Question about DEFVAR_LISP_NOPRO

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

"K. Handa" <handa@gnu.org> writes:

> In article <jwvil0vbx6t.fsf-monnier+emacs@gnu.org>, Stefan Monnier <monnier@iro.umontreal.ca> writes:
>
>> >   DEFVAR_LISP_NOPRO ("font-weight-table", Vfont_weight_table,
>> >                  doc: /*  Vector of valid font weight values. ... */);
>> >     Vfont_weight_table = BUILD_STYLE_TABLE (weight_table);
>> >     make_symbol_constant (intern_c_string ("font-weight-table"));
>> >
>> > Here a symbol is defined which has a value that is forwarded to the
>> > static globals.f_Vfont_weight_table, but that static is not staticpro'd.
>> >
>> > My question is simply: What the heck?
>
>> I think only Kenichi knows the real answer (commit d0ab1ebe49f7), but my
>> guess is that it was just an optimization because those vars always
>> refer to each of the three elements of the `font_style_table` which *is*
>> gcpro'd and is not exposed to ELisp so we know that a non-moving GC doesn't
>> need to know about those vars.
>
> As far as I remember, Stefan is right, it was for optimization.

Thanks.