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Re: init_method_t for coroutines and subs?

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Melvin Smith
July 7, 2002 19:53
Re: init_method_t for coroutines and subs?
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At 08:55 AM 7/5/2002 -0500, David M. Lloyd wrote:
>On Wed, 3 Jul 2002, Melvin Smith wrote:
> > At 09:51 PM 7/3/2002 -0400, Josh Wilmes wrote:
> > >I know there was some talk about this extra "address" parameter recently,
> > >but i'm not sure what the upshot of it is.  Right now, tcc is complaining
> > >loudly because the init functions for parrotsub and parrotcoroutine don't
> > >match the init_method_t type in the _vtable structure.
> > >
> > >What's the deal here?
> >
> > I made the PMC init method take an int argument sometime around
> > January, and at the time we agreed it would be useful to have polymorphic
> > constructors. Then it sort of silently got removed.
> >
> > I suppose the patch was done around the same time I commited
> > the sub/coroutine PMCs, which would explain why they got out of sync.
> >
> > Passing an optional arg to the constructor can possibly save us cycles
> > in the long run, for examples, the PMCs that need to know how to size
> > themselves. Unless we do lazy allocation, aggregates usually preallocate
> > at construction time, then resize later. For languages other than Perl
> > that might need a "struct" type, it makes sense to request the correct
> > allocation up front. The size could be bytes, elements, or kilometers.
> > It doesn't need to be just size, as in subs/coroutines.
> >
> > In any case, it wasn't doing any harm, so I'm not sure why it got
> > removed.
>It got removed because it wasn't in the spec... Dan directed that we
>replace it with a version of init that accepts a PMC argument
>(init_pmc_method_t) that can be used to send in initial size or whatever
>else you can dream up.

Ah yes, sorry I wasn't poking at anyone. I just remember being distracted
and then, *poof*, it was gone. I recall the (much needed) monster patch
for PMC cleanup.


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