At 12:25 AM 9/27/2001 +0200, Samuele Pedroni wrote:
>Another question.
>
> >
> > We're going to call type a lot.
>Why? in which kind of code?
>it seems to me that the point of having an object-based VM is in
>order to avoid calling type a lot. What I'm missing?
Yeah, but this isn't a purely object based VM.
>Are you referring to the double dispatch code for arith ops or ...
Yup. Dispatch will look like:
result = pmc1->vtable[ADD + pmc2->vtable[TYPE](pmc2, NUM)](pmc1, pmc2);
to get the right numeric addition vtable entry.
Most of the vtable functions have multiple entries, and the one we call is
determined by the type of the second argument. A sort of short-circuit
multi-method dispatch.
Dan
--------------------------------------"it's like this"-------------------
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