Getting the size of the call stack

["Soni L." <fakedme@...>]

How can I get the size of the call stack in O(logn) time? It doesn't 
seem that Lua has an O(1) way to do it as it currently stands, and I 
need it for virtualization. O(logn) is the closest I can get. (assuming 
getinfo doesn't take O(n) time to access a stack index...)

I mean do I just call getinfo with an increasing index and stuff?

(So much for having absolute stack indices... Why can't I use negative 
indices again? And get the length in O(1) time? Guess that's just not 
often needed or something?)

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