Fix InteriorUseWalker: consider partial_apply [on_stack] an escape #85934
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Fixes a bug in MandatoryDestroyHoisting where a captured value is destroyed before a copy of the closure. On-stack closures can be copied, and all copied uses must be within the borrow scope of the captured operand. This is just like any other non-Escapable value, so treat it as such by checking `Value.mayEscape` rather than `Type.Escapable`. Originally, I wanted to make it illegal to copy of partial_apply [on_stack], but it looks like we still allow it. I would rather not complicate any logic yet with special handling for this case. To fix any performance concerns, we might be able to simplify the representation instead by banning copy_value on on-stack closures. Fixes rdar://165850554 swift-frontend crash: While running "CopyPropagation" - Invalid SIL provided to OSSACompleteLifetime?!)
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@swift-ci test |
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@swift-ci benchmark |
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@swift-ci test linux |
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@swift-ci test macOS platform |
eeckstein
approved these changes
Dec 10, 2025
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This has no impact on the benchmark scores |
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TIMEOUT: lldb-api :: functionalities/tsan/swift-access-race/TestTsanSwiftAccessRace.py |
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@swift-ci smoke test macOS |
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Fixes a bug in MandatoryDestroyHoisting where a captured value is destroyed
before a copy of the closure.
On-stack closures can be copied, and all copied uses must be within the borrow
scope of the captured operand. This is just like any other non-Escapable value,
so treat it as such by checking
Value.mayEscaperather thanType.Escapable.Originally, I wanted to make it illegal to copy of partial_apply [on_stack], but
it looks like we still allow it.
I would rather not complicate any logic yet with special handling for this
case. To fix any performance concerns, we might be able to simplify the
representation instead by banning copy_value on on-stack closures.
Fixes rdar://165850554 swift-frontend crash: While running "CopyPropagation" -
Invalid SIL provided to OSSACompleteLifetime?!)