Mo DeJong wrote:
>  The short answer is that you can't really scan a Tcl proc to figure out 
>  if it does not make use of upvar or
>  other linked variables. You can write a compiler that assumes that a 
>  proc does not deal with linked variables,
>  but it is trivial to create a test case that breaks this optimization.

You can do it, but it's not at all easy. It depends on collecting
information on each procedure to find out if it uses tricky commands.
Initially, you only get to determine what "leaf" procedures are up to,
but with the leaves figured out, you'll be able to go further up the
call tree and optimize things further (a procedure is non-tricky if it
does not call anything tricky). I suspect that much code will do quite
well from this technique, and everything else will be right where we are
now. (Getting rid of the current strategy is likely to be impossible,
even if we add new ones on top.)

Donal.


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