ABISafeConversionComponent should be a TranslationComponent #61029
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…er than physical Also renaming it to be UncheckedConversionComponent since it's a better name. As a physical component, we'd run into problems in assignment statements. The problem was that if we had something like: ``` SomeOtherComponent // first component GetterSetterComponent ABISafeConversionComponent // last component ``` When emitting the assignment, we always drill down through all but the last component by calling `project()` on each one. Then on the last component, we'd do the actual setting operation. But GetterSetterComponent cannot be projected when the access is for writing. So, to work around this I decided to model it as a TranslationComponent, because those are specifically designed to be handled during an assignment by popping those off the end of the component sequence, untranslating the value we're about to assign as we go, until we hit the GetterSetterComponent. By "untranslating" we're effectively putting Sendable back onto the set's argument prior to calling set, because the underlying property's type still has `@Sendable` on it (e.g., it's accessors still have that on its argument type). When "translating" we're effectively taking Sendable off after reading it. I think actually works really well and makes much more sense now. resolves rdar://99619834
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@swift-ci please test and merge |
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Builds upon / fixes #60521
Also renaming it to be UncheckedConversionComponent since it's a better name.
As a physical component, we'd run into problems in assignment statements.
The problem was that if we had something like:
When emitting the assignment, we always drill down through all but
the last component by calling
project()on each one. Then on the lastcomponent, we'd do the actual setting operation. But GetterSetterComponent
cannot be projected when the access is for writing.
So, to work around this I decided to model it as a TranslationComponent, because
those are specifically designed to be handled during an assignment by popping those
off the end of the component sequence, untranslating the value we're about to assign
as we go, until we hit the GetterSetterComponent.
By "untranslating" we're effectively putting Sendable back onto the set's argument
prior to calling set, because the underlying property's type still has
@Sendableon it (e.g., it's accessors still have that on its argument type). When
"translating" we're effectively taking Sendable off after reading it.
I think actually works really well and makes much more sense now.
resolves rdar://99619834