in the description says:
VM specs
* Register based
<http://github.com/macournoyer/tinyrb/blob/master/vm/opcode.h>,
(like Lua)
* Boehm GC <http://www.hpl.hp.com/personal/Hans_Boehm/gc/>
* Very small < 64K, ~2000 sloc
* Method caching and some inlining
* Lexer in Ragel, parser in Lemon
that ~2kloc sounds suckless :)
http://code.macournoyer.com/tinyrb/ [+]
