[5.7-04182022 🍒] Proper fix for ObjC async jump to null #58631
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when two objc async functions are composed with each other, i.e., f(g()), then the clean-ups for g() would get emitted at an unexpected time, namely, during the suspension for the call to f(). This means that using a clean-up to emit the executor-hop breadcrumb was incorrect. The hop could appear between a get_async continuation and its matching await_continuation, which is an unsupported nested suspension. This commit fixes that by removing the use of the breadcrumb clean-up in favor of providing that breadcrumb directly to the result plan, so that it may be emitted later on when the result plan sees fit. Fixes rdar://91502776
kavon
added
concurrency
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@swift-ci please test |
DougGregor
approved these changes
May 4, 2022
AnthonyLatsis
added
🍒 release cherry pick
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Cherry-pick of #58515
when two objc async functions are composed with each other,
i.e., f(g()), then the clean-ups for g() would get emitted
at an unexpected time, namely, during the suspension for
the call to f(). This means that using a clean-up to emit
the executor-hop breadcrumb was incorrect. The hop could
appear between a get_async continuation and its matching
await_continuation, which is an unsupported nested suspension.
This commit fixes that by removing the use of the breadcrumb
clean-up in favor of providing that breadcrumb directly to
the result plan, so that it may be emitted later on when the
result plan sees fit.
Fixes rdar://91502776