PCC and playing with arguments from C

[Florian Hatat]

It looks like some bits of my previous message got lost (probably
between my chair and the keyboard), so I'm resending it.

I'm trying to write a PMC which handles curried subs (i.e., subs which
only run when provided with enough arguments, when there are too few of
them, it just stores the given arguments, then returns a new sub which
only expects the remaining arguments).

Writing it in PIR is (for the moment) excluded because of ticket #103.
(I have no way to retrieve previous arguments without "self" in "invoke").

So I'm trying to write the PMC in C. Unfortunately, I have no idea of
how to play with arguments from C, and Parrot's documentation so far has
not be very helpful.

Has someone got a few examples of, say:
* retrieving the number of arguments passed to the sub (the idea would
be to do that quickly without moving arguments: when there are enough
arguments, I just want to run the actual code),
* moving them around (to store them in a ResizablePMCArray, for example)?

I looked at PDD03, but this mainly talks about PIR, and tried to
understand what functions in src/call/pcc.c do (I have the feeling that
my answer is in there, because of the code generated for METHODs in
PMCs, yet running perldoc pcc.c was not very useful to me).

Thanks,

-- 
Florian,
http://openweb.eu.org/
http://www.linux-france.org/