synthized attributes in eli

"Oguz Akyuz" <oguzakyuz@softhome.net>
26 Nov 2002 22:14:07 -0500

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Related articles
synthized attributes in eli oguzakyuz@softhome.net (Oguz Akyuz) (2002-11-26)
Re: synthized attributes in eli asloane@ics.mq.edu.au (Tony Sloane) (2002-12-01)
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From: "Oguz Akyuz" <oguzakyuz@softhome.net>
Newsgroups: comp.compilers
Date: 26 Nov 2002 22:14:07 -0500
Organization: http://groups.google.com/
Keywords: tools, question
Posted-Date: 26 Nov 2002 22:14:07 EST

assume I have a small grammar like:
A: B / C .


When I try:
RULE: A ::= B COMPUTE
      A.Type = B.Type;
END;


(Assume that both A and B have Type attributes and B.Type is something
defined)


I get an error like "miscomputation of A.Type" from eli system.


Why does eli demand me to also add the rule(since adding this solves
the problem):


RULE: A ::= C COMPUTE
      A.Type = C.Type;
END;


I couldn't understand the point. I would be pleased if someone explains.
Thanks


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