[Runtime] Immediate release and return when destroying partial instance of pure ObjC class. #65776
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jckarter
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May 8, 2023
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@swift-ci please test and merge |
al45tair
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al45tair
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stdlib/public/runtime/HeapObject.cpp
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Hmmm. Looks like this file somehow doesn't include the definition of id; seems odd that it's got objc_release(), but not id.
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Oh silly me, this needs to be guarded by OBJC_INTEROP too.
…ce 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
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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