> I may be wrong, but doesn't a typical function invocation involve
> dereferencing the Var holding the object that implements "IFn" and
> calling invoke? It seems pretty intuitive to me that this would be
> difficult to inline by the JIT, there is a little bit of
> synchronization going on every time a Var is dereferenced.
In principle, the JIT can inline the Var lookup, and do the
appropriate analysis to eliminate much of the work -- Vars have thread-
local bindings, so the JVM should be pretty well aware of access and
scope. Of course, this will only happen if everything is small enough,
frequently used, etc. etc.
I saw a presentation at JavaOne which illustrated to just what extent
the dynamic compiler can eliminate locks, allocations, aliases,
synchronization boundaries, do closed-world analysis of class
hierarchies, and so on. It's pretty impressive. ("Inside Out: A Modern
Virtual Machine Revealed", if you're interested.)
-R
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