[6.2][Distributed] Fix computed properties in protocols on arm64e #82010
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This actually manifested as an pointer auth crash, but the real reason being is that we messed up the order of elements in the witness table. If we'd skip the accessor like this, the types we sign/auth with would no longer align and manifest in a crash. There is no real reason to skip this entry so we just bring it back, and avoid making this special in any way. This unlocks a few tests as well as corrects any distributed+protocol use where a requirement distributed var was _followed by_ other requirements. resolves rdar://125628060
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We had a number of problems either "only in" or "only without" library evolution and protocols, so in order to increase the test coverage, run a few of the crucial tests in both modes.
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hborla
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Jun 10, 2025
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Description:
This actually manifested as an pointer auth crash, but the real reason being is that we messed up the order of elements in the witness table. If we'd skip the accessor like this, the types we sign/auth with would no longer align and manifest in a crash.
There is no real reason to skip this entry so we just bring it back, and avoid making this special in any way.
Scope/Impact: Computed distributed properties in distributed protocols were not usable on arm64e before this change. Causing trouble to some protocols being adopted to distributed actors.
Risk: Low, the change removes a special case that was not necessary specifically in distributed computed property accessor entries in witness tables. No impact on other code.
Testing: CI testing, verified the arm64e issue specifically locally
Reviewed by: @xedin
Original PR: #82009
Radar: rdar://125628060