Michael Gottesman f328e7893b [region-isolation] Add support for representing ApplyIsolationCrossing at the SIL level on apply, begin_apply, try_apply. ...

Some notes:

This is not emitted by SILGen. This is just intended to be used so I can write
SIL test cases for transfer non sendable. I did this by adding an
ActorIsolationCrossing field to all FullApplySites rather than adding it into
the type system on a callee. The reason that this makes sense from a modeling
perspective is that an actor isolation crossing is a caller concept since it is
describing a difference in between the caller's and callee's isolation. As a
bonus it makes this a less viral change.

For simplicity, I made it so that the isolation is represented as an optional
modifier on the instructions:

  apply [callee_isolation=XXXX] [caller_isolation=XXXX]

where XXXX is a printed representation of the actor isolation.

When neither callee or caller isolation is specified then the
ApplyIsolationCrossing is std::nullopt. If only one is specified, we make the
other one ActorIsolation::Unspecified.

This required me to move ActorIsolationCrossing from AST/Expr.h ->
AST/ActorIsolation.h to work around compilation issues... Arguably that is where
it should exist anyways so it made sense.

rdar://118521597

2023-12-11 19:27:27 -06:00

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