ikudrin added a comment.
I agree that it'd be expensive to put a new counter after each function call.
Even if there is no `throw` statement within a TU, called functions still may
raise exceptions.
Anyway, if we come across a `try` statement, we can guess that some exceptions
are expected and do our best to support constructions like this:
try {
...
}
catch (...) {
...
throw;
}
http://reviews.llvm.org/D20878
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