[6.0][Concurrency] Further prevent crashes in legacy mode of isSameExecutor concurrency #73839
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DougGregor
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resolves rdar://128425368 resolves rdar://127400013
…ain thread that this is equal
…r swift6/legacy modes
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Last commit here is unbreaking embedded, pick from: #73934 |
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Description: This cleans up interactions with the "legacy mode" where we're not allowed to crash in the isCurrentExecutor impl.
Scope/Impact: Dynamic actor isolation checks are inserted by Swift 6. Without this patch they would crash existing applications without them recompiling. This patch corrects logic to only start doing so when recompiled against new SDK. It also corrects some logic that would have prevented
checkIsolatedfrom being invoked in some cases.Risk: Medium, the change is fleshing out logic in
swift_task_isCurrentExecutorImplinteractions between flags. However we took great lengths to verify this logic is now correct.Testing: Verified manually; Improved tests to now run in swift 6 AND legacy mode.
Reviewed by: @hborla @mikeash
Original PR: #73813
Radar: rdar://127400013