[Bug translator/13009] Allow @defined($foo) in probe predicates

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13009

Frank Ch. Eigler <fche at redhat dot com> changed:

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                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> 2011-07-20 22:30:40 UTC ---
"But this gives "semantic error: unexpected @defined". "

That's odd - the code should accept pretty general expressions.

"Once @defined is allowed in the predicate, we can further optimize that
predicate == 0 throws the whole body away"

Sure, or delete the probe directly.

"and probes with empty bodies are discarded entirely."

That's bug #11353.

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