[armedbear-devel] Implementing non local exits in a runtime with structured exception handling
Matthew D. Swank
akopa at charter.net
Thu Oct 15 05:46:28 UTC 2009
I am playing with a lisp dialect (at least in my head) that I am
thinking about implementing on the CLR. Like Java the CLR requires
jumps across method call boundaries to be done using the exception
handling mechanism.
If I have code like the following in abcl:
(block foo
(flet ((callback () (return-from foo t)))
(something-that-calls-into-java #'callback)
... stuff that won't happen if the callback is invoked))
And the plain old Java I'm calling into is pathological and catches the
exception raised by calling the callback without re-throwing it, the
non-local return never happens. Is that correct?
If so, is there no way around it?
Matt
--
"You do not really understand something unless you can explain it to
your grandmother." -- Albert Einstein.
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