On Friday, 7 February 2014 at 16:41:00 UTC, Dmitry Olshansky
wrote:
Meh. If exceptions are such a liability we'd better make them
(much) faster.
It's not stack unwinding speed that's an issue here though, but
rather that for client-facing services, throwing an exception
when an invalid request is received gives malicious clients an
opportunity to hurt service performance by flooding it with
invalid requests. Improving the exception code specifically
doesn't help here because the real issue is with GC collections.
I'd say that the real fix is for such services to simply not
throw in this case. But the exception could always be recycled
as well (since in this case you know that throwing will abort the
transaction and so will always be immediately discarded). I'm
not convinced that there's any need for a language change here to
support scoped exceptions. That seems a bit like killing the ant
with a steamroller.
