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[memory-lifetime] Teach the verifier that select_enum_addr doesn't write to memory. #32177

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Jun 4, 2020
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[memory-lifetime] Teach the verifier that select_enum_addr doesn't write to memory. #32177

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1 change: 1 addition & 0 deletions lib/SIL/Verifier/SILVerifier.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -546,6 +546,7 @@ struct ImmutableAddressUseVerifier {
case SILInstructionKind::FixLifetimeInst:
case SILInstructionKind::KeyPathInst:
case SILInstructionKind::SwitchEnumAddrInst:
case SILInstructionKind::SelectEnumAddrInst:
break;
case SILInstructionKind::AddressToPointerInst:
// We assume that the user is attempting to do something unsafe since we
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17 changes: 17 additions & 0 deletions test/SIL/memory_lifetime.sil
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Expand Up @@ -377,3 +377,20 @@ bb6(%45 : @owned $Error):
br bb4(%45 : $Error)
}

sil [ossa] @test_memory_lifetime_select_enum : $@convention(thin) (@in_guaranteed Optional<T>) -> () {
bb0(%0 : $*Optional<T>):
%2 = integer_literal $Builtin.Int1, 0
%3 = integer_literal $Builtin.Int1, 1
%4 = select_enum_addr %0 : $*Optional<T>, case #Optional.none!enumelt: %2, case #Optional.some!enumelt: %3 : $Builtin.Int1
cond_br %4, bb1, bb2

bb1:
br bb3

bb2:
br bb3

bb3:
%9999 = tuple()
return %9999 : $()
}