2016-08-11 11:52 GMT+03:00 Jonathan Hull via swift-evolution < swift-evolution@swift.org>:
> Could someone explain in simple terms what the ABI is and what sorts of > things might affect it? > > I had thought it was the layout in memory of structs/classes/etc… and how > the program knows where to go to find a particular field. This seems to be > incorrect though, as I have seen many features that I would assume have > some affect on this layout ruled “out of scope for phase 1”. For example, > I would think that many generics features would have an impact on the ABI, > or the idea of COW (via secret boxing) for structs, or even union types. > > At the very least, I would think that mix-ins would have a fairly > significant effect. ABI stability means that changes will have to be backwards compatible after a certain stage. If we can add mixins feature without modifying old code (and its SIL and IR and whatever), then we are fine.
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