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- Subject: Re: Lua Virtual Machine Spec?
- From: Roberto Ierusalimschy <roberto@...>
- Date: Mon, 05 May 2003 09:43:58 -0300
> Neither FORPREP or FORLOOP actually references the loop index, so
> how do they know what variable to reference?
They are on the top of the stack (Lua 4.0).
> I suspect that some information is being left on the stack, since
> 'break' generates a POP 3 before the JMP.
Right. The pop removes the index, the step, and the limit.
> Oddly enough, a RETURN from a function from within several loops also
> only generates a POP 3, instead of a POP 6. Curious...
It should generate no pops (?). A return does not need to pop anything,
because when the function returns its whole stack slice will be removed.
-- Roberto
