On Mon, May 23, 2011 at 03:05:43PM -0000, Parrot wrote:
> #1962: :instanceof('Foo') is untested
> Comment(by whiteknight):
>
> I strongly suggest we deprecate it. The current implementation through
> IMCC is inextricably linked to the internals of the Sub PMC, and changing
> that situation would almost be a larger task than removing and replacing
> IMCC completely.
FWIW, as far as I know :instanceof has always been listed as an
"experimental feature" (pdd19), so deprecation might not even be
needed. It was implemented as an early attempt at creating
HLL-derived Sub types (needed by Rakudo) that quickly failed, but
the code was never removed.
> It's worth noting that at the PBC level this should be very possible to
> do. However, IMCC makes it almost impossible to do as-is. An alternate
> assembler (or an alternate tool for generating PBC without PIR/IMCC)
> should give us new possibilities in this area.
>From Rakudo's perspective, the problem with :instanceof was that it
could only be used with PMCs (which had to exist and be loaded at
compilation time); it could not be used to create Subs that were
defined in Parrot's Object/Class type hierarchy (e.g., as a HLL-derived
type).
Pm
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