lua kernel hacker's guide?

["Bruce Dodson" <bruce_dodson@...>]

I'm interested in learning how Lua works internally (I mean down at the
lparser / lopcode / lvm level) but find that, at this level, I'm foiled by
the lack of comments in the source code.  At the lapi level, and in the
library, everything is simple, clear, comprehensible; but down underneath, I
can only grok it with great difficulty.

Is there a guide to the internals?  I'm able to read Portuguese so if it's
some PUC-Rio paper that would be fine too.

Thanks,
Bruce