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Postings from March 2000
From: M.J.T. Guy [mailto:mjtg@cus.cam.ac.uk]
>
> Good point. I was proposing to look for both "PL_na" and "na" etc.
> If a PL... symbol was found, we can assume the module has been updated
> so no POLLUTE is needed. I'd only force POLLUTE if there were
> polluting symbols present and *no* PL... ones.
But... In the case of na, a good fix for (silly example)
{ na = 12; }
is
{ STRLEN na; na = 12; }
instead of
{ PL_na = 12; }
because access to a local variable is faster than access to a global.
So a fixed module may still refer to na rather than PL_na. (I assume you
don't propose to scan for declarations...?)
I'm not sure of the value of the heuristic approach in any case, but I
thought I'd add this datapoint...
Paul.