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https://www.eclipse.org/forums/index.php/mv/msg/7091/21582/#msg_21582
I found the following master thesis to be a quite readable introduction
to all things language extension:
Several approaches are compared (CIL, Polyglot, xtc, and Xoc) for the
same set of extensions (bitwise rotation operator, function expressions,
and lock checking).
Besides, the introduction reviews extension composability, lazy
computation and compilation passes, attribute grammars, Stratego, in
short, I find that report offering a good overview for those fighting
with language extensions (I, for one, am trying to embed LINQ in Java
these days http://bugs.eclipse.org/234003 , initially without
full-fledged syntax extension but as *typesafe* embedded DSL "only" )