Jeff Horwitz wrote:
the implicit return is by definition always at the end of a sub and
therefore emits a PIR .return(). it's fast and easy.
the explicit return, in contrast, could be anywhere in a subroutine,
including loops, closures, etc. these constructs are also implemented
using parrot subs, so using .return() would return control to the sub
that *contains* the loop, closure, or whatever construct you're using.
that's not what we want.
to get around this, an exception is thrown and caught by the sub that
*should* do the actual returning. you can see that in the PIR you
generate.
(pmichaud, i hope i explained this right! ;-)
-jeff
Thanks, I see now what is the difference. Probably we could optimize out
the explicit returns when we reach the "optimization" phase of the
project.
Best regards
luben
