Sema: Allow non-final classes to satisfy properties and subscripts with covariant Self #34005
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Should I be adding some execution tests? |
…th covariant Self
AnthonyLatsis
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slavapestov
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Sep 21, 2020
This ensures that we erase opened archetypes before closing an existential result
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AnthonyLatsis
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| // CHECK: [[PCOPY_ADDR:%[0-9]+]] = open_existential_addr immutable_access [[P]] : $*P to $*@opened([[N:".*"]]) P | ||
| // CHECK: [[P_RESULT:%[0-9]+]] = alloc_stack $P | ||
| // CHECK: [[PCOPY_ADDR_1:%[0-9]+]] = alloc_stack $@opened([[N]]) P | ||
| // CHECK: copy_addr [[PCOPY_ADDR]] to [initialization] [[PCOPY_ADDR_1]] : $*@opened([[N]]) P | ||
| // CHECK: [[P_P_GETTER:%[0-9]+]] = witness_method $@opened([[N]]) P, #P.p!getter : {{.*}}, [[PCOPY_ADDR]]{{.*}} : $@convention(witness_method: P) <τ_0_0 where τ_0_0 : P> (@in_guaranteed τ_0_0) -> @out τ_0_0 | ||
| // CHECK: [[P_RESULT_ADDR2:%[0-9]+]] = init_existential_addr [[P_RESULT]] : $*P, $@opened([[N]]) P | ||
| // CHECK: apply [[P_P_GETTER]]<@opened([[N]]) P>([[P_RESULT_ADDR2]], [[PCOPY_ADDR_1]]) : $@convention(witness_method: P) <τ_0_0 where τ_0_0 : P> (@in_guaranteed τ_0_0) -> @out τ_0_0 | ||
| // CHECK: destroy_addr [[PCOPY_ADDR_1]] : $*@opened([[N]]) P | ||
| // CHECK: destroy_addr [[P_RESULT]] : $*P | ||
| // CHECK: dealloc_stack [[PCOPY_ADDR_1]] : $*@opened([[N]]) P | ||
| // CHECK: dealloc_stack [[P_RESULT]] : $*P | ||
| _ = p.p |
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If this output happens to be sane, why do we need PCOPY_ADDR_1 in addition to PCOPY_ADDR?
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I think it's just SILGen inserting an unnecessary copy. It does that sometimes.
slavapestov
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Sep 24, 2020
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Hopefully, whatever complications were impeding this in 926e371 are long gone.
Bonus: now we can use protocols with such requirements as types (iff the requirement was the reason we previously couldn't).