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...placed in the vtable and the hidden value will simply be ignored in those cases. Hence in general the only overhead versus a C++ virtual call is setting the hidden value, which is essentially a negligible cost. For more detail, the basic elements of the virtual call mechanism are described in 'Invokeinterface Considered Harmless' [2] (albeit for Java). ---- Encoding calls in LLVM IR ---- Encoding this information in LLVM IR seems to be very difficult, albeit I've noticed some recent developments (such as musttail) that could be useful for this. There was a previous discussion of this issue in...

This is related to the general question of efficiency of unwinds. I'm mulling over whether to use the Java-style or Python-style iterator protocol for my language. The Python style is to have a special exception (StopIteration) that is thrown when the end of the sequence is reached. The Java style is to have a separate "hasNext" method on the iterator object that says whether or