[5.9][Runtime] Immediate release and return when destroying partial instance of pure ObjC class. #65822
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…nstance of pure ObjC class. Make swift_deallocPartialClassInstance check if the object's class is a pure ObjC class, in which case there are no ivar destroyers and we can just return immediately. It's possible for an allocWithZone: override to cause self to be a special object constructed in read-only memory. swift_deallocPartialClassInstance calls object_setClass to avoid running the dealloc method of any Swift subclasses, but this call crashes if self is read-only. It's unnecessary when the object's class is pure ObjC and therefore there are no Swift subclasses, so just skip it entirely. rdar://107756747 (cherry picked from commit 3a396af)
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• Description: A failable initializer in an extension on an ObjC class can attempt to mutate a read-only placeholder object when it fails. |
airspeedswift
approved these changes
May 10, 2023
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@swift-ci please smoke test and merge |
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Cherry-pick of #65776 to
release/5.9.Make swift_deallocPartialClassInstance check if the object's class is a pure ObjC class, in which case there are no ivar destroyers and we can just return immediately.
It's possible for an allocWithZone: override to cause self to be a special object constructed in read-only memory. swift_deallocPartialClassInstance calls object_setClass to avoid running the dealloc method of any Swift subclasses, but this call crashes if self is read-only. It's unnecessary when the object's class is pure ObjC and therefore there are no Swift subclasses, so just skip it entirely.
rdar://107756747