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On 19 Jan 2018, at 14:48, John Reagan via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > OpenVMS' EH model is for full asynchronous prologue/epilogue EH. We do more > than just program-level EH, but have to deal with OS events (timers going off, > asynch I/O completion, mailboxes filled with data, etc.) which could result in > an unwind occurring. > >

> From: Tim Northover via llvm-dev <llvm-dev at lists.llvm.org> > Emitting directives in the epilogue is hard because the directives > apply to all instructions after in program-counter order. So if you > have an epilogue in the middle of a function and emit CFI directives > saying the registers are back where they were then the unwinder will > think that applies to the

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