Make autoreleasepool take the pool as a parameter
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The lifetime of the parameter is the lifetime of references in the pool. This allows us to bound lifetimes on autoreleased objects, thereby making them safe to return.
A nightly-only feature that adds the auto trait `AutoreleaseSafe` and uses it to prevent calling `autoreleasepool` with closures that capture an outer `AutoreleasePool`. This fixes on nightly the unsoundness hole preventing `autoreleasepool` from being used to safely construct references to autoreleased objects.
Prevent using the lifetime from an outer pool when an inner pool is active.
madsmtm
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Sep 2, 2021
Make `autoreleasepool` take the pool as a parameter
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The pool is given as a reference, and the lifetime of the reference is the same as the lifetime of autoreleased objects in the pool. This allows us to bound the lifetimes of autoreleased objects, thereby making them safe to return.
Replaces SSheldon/rust-objc#103. See SSheldon/rust-objc#95 for some more examples and the reasoning behind this.
The primary motivation is to make
NSString::as_strsafe, more info can be found in SSheldon/rust-objc#103 (comment).I did try to explore the concept described in SSheldon/rust-objc#103 (comment) with making
AutoReleaseSafe~Send + Syncon stable, but this proved too much of a usability issue, at least until it's more common to use custom objects (that would then beSend + Sync) rather thanObject.