Runtime checking for associated types conforming to invertible protocols #72788
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Only the non-zero-sized associated values of a type were considered when determining whether an enum is copyable or was trivially-destructible, meaning that a zero-sized, noncopyable type with a `deinit` wouldn't get destroyed. Treat these associated values as if they were a payload, and centralize the logic for figuring out these overall aspects of the enum (copyable, trivially-destructible, bitwise-takable) since the same checks were repeated. Fixes rdar://118449507.
Emit metadata for runtime checks of conformances of associated types to invertible protocols, e.g., `T.Assoc: Copyable`. This allows us to correctly handle, e.g., dynamic casting involving conditional conformances that have such constraints. The model we use here is to emit an invertible-protocol constraint that leaves only the specific bit clear in the invertible protocol set.
DougGregor
requested review from
al45tair,
hborla,
mikeash,
slavapestov and
xedin
as code owners
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Emit metadata for runtime checks of conformances of associated types to
invertible protocols, e.g.,
T.Assoc: Copyable. This allows us tocorrectly handle, e.g., dynamic casting involving conditional
conformances that have such constraints.
The model we use here is to emit an invertible-protocol constraint
that leaves only the specific bit clear in the invertible protocol
set.