Re: Handy Algorithm For Using B::Generate

[stvn]

chromatic,

Thanks, I started to doing this earlier today, and then just got stuck on trying to get plain old B to print out the innards of my subroutines (building off Simon's tutorial's examples). I think I read about half the code in B::Deparse before I managed to hit something similar to the infinite loop you speak of in Step 8.

I also kept encountering a package B::SPECIAL, for which I saw no listing in B documentation for, but did find in the source that is was just a plain old B::OBJECT. Anyone know what this refers too?

-stvn

[diotalevi]

B::SPECIAL objects are instances of pointers to the perl global invariants, PL_sv_undef, PL_sv_yes, and PL_sv_no. You were seeing one of those.

[stvn]

You guys wouldn't happen to know how to fetch the scalar value associated with a B::GV object too would you?

Looking at the results from Devel::Peek::Dump($a), it would seem to me that the GV -> GP -> SV would be the pathway to the SV (and its eventual value), but there is no GP method for the B::GV object. I am sure I am just missing something very obvious here, but I can't seem to resolve this. All I can seem to get when I call B::GV->SV is a B::NULL object, which makes no sense. Am I just running into the optimizer here?

Okay, going to bed now with visions of op-code trees dancing in my head. Should make for some interesting dreams.

-stvn

[diotalevi]

Re: Magic (Re: Re: Discovering the lvaluable function behind the reference) included here.

From B, you get a GV's SV by going ->SV. Just because you got a null SV doesn't mean that its the wrong answer.