YARV Bytecode Documentation

Hello *,

does anybody know any (if possible up-to-date)
documentation/specification of the Ruby 1.9 (YARV) bytecodes? The only
docs I could find are:

http://www.atdot.net/yarv/insnstbl.html (a simple table of the opcodes)

and

http://www.atdot.net/yarv/yarvarch.en.html (not much more than a table)

However, both sites seem to be outdated and are lacking some useful
explanations (e.g., what is the op_flag parameter for a send, and many
more); also the sourcecode of the VM itself seems to be totally
undocumented in that regard.

Help would be much appreciated! Thanks in advance,
Christoph
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