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26b03096c6
We didn't serialize the ownership kind, which resulted in a miscompile causing an over-release. The unchecked_ref_cast is the only instruction for which we change the ownership in the optimizer, so that it doesn't match the operand's ownership. Therefore this fix is sufficient for now - we don't need to serialize the ownership of other instructions. But this is really a design flaw of the `OwnershipForwardingMixin`. It should not allow to set the ownership to arbitrary values. rdar://92696202
22 lines
670 B
Plaintext
22 lines
670 B
Plaintext
// RUN: %empty-directory(%t)
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// RUN: %target-build-swift -emit-module -module-name ossa -o %t/ossa.swiftmodule %s
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// RUN: %target-sil-opt %t/ossa.swiftmodule | %FileCheck %s
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sil_stage canonical
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import Builtin
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import Swift
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import SwiftShims
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class X {}
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// CHECK-LABEL: sil [serialized] [canonical] [ossa] @test_unchecked_ref_cast
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sil [serialized] [ossa] @test_unchecked_ref_cast : $@convention(thin) (@guaranteed AnyObject) -> @owned X {
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bb0(%0 : @guaranteed $AnyObject):
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// CHECK: %1 = unchecked_ref_cast %0 : $AnyObject to $X, forwarding: @unowned
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%1 = unchecked_ref_cast %0 : $AnyObject to $X, forwarding: @unowned
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%2 = copy_value %1 : $X
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return %2 : $X
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}
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