Change how mutability in msg_send! is done
#150
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msg_send! such that callers can properly communicate mutabilitymsg_send! is done
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I'll go with idea 3, to make |
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This fixes a long-standing soundness issue with how message sending is done whilst mutating the receiver, see: SSheldon/rust-objc#112. We were effectively mutating behind either `&&mut T` or `&T`, where `T` is zero-sized and contains `UnsafeCell`, so while it is still uncertain exactly how much of an issue this actually is, the approach we use now is definitely sound! Also makes it clearer that `msg_send!` does not consume `Id`s, it only needs a reference to those.
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If you do not want to consume it, the possibility of doing `msg_send![&*obj]` exists, but most of the time that is indeed what you want (I mean, why else would you wrap it in `ManuallyDrop`?)
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This was referenced Jun 12, 2022
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madsmtm
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See madsmtm/objc2#150 for a bit of background
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See madsmtm/objc2#150 for a bit of background
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See madsmtm/objc2#150 for a bit of background
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See madsmtm/objc2#150 for a bit of background
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See madsmtm/objc2#150 for a bit of background
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See madsmtm/objc2#150 for a bit of background
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See madsmtm/objc2#150 for a bit of background
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* Use objc2 * Replace `objc_id` * Remove sel_impl import * Fix `add_method` calls * Fix accessing raw FFI functions * Fix Encode impl * Fix message sends arguments that do not implement `Encode` * Use immutable reference in a few places where now necessary See madsmtm/objc2#150 for a bit of background * Add a few Send + Sync bounds where examples require it This is something we'll need to look into properly * Use `&'static Class` instead of `*const Class` Safer and more ergonomic. Also required for `msg_send_id!` macro * Use msg_send_id! and rc::Id * Update objc2 to v0.3.0-beta.2 * Replace `BOOL` with `Bool` when declaring delegates This makes cacao compile on Aarch64 again * Remove a few impossible to use correctly `into_inner` functions These consumed `self`, and hence also dropped `Id` variable that was responsible for keeping the returned pointer alive * Remove a few impossible to use correctly `From` implementations * Quickly fix UB with using BACKGROUND_COLOR ivar * Fix double-freeing of windows * Fix double freeing of strings * Fix a few remaining double-frees
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Resolves upstream issue SSheldon/rust-objc#112.
Whichever solution we choose has quite the large effect on #120, since we'd like
msg_send!andmsg_send_id!to be consistent, and e.g.msg_send_id!sometimes needs the ability to consume its arguments.This PR is a stab at implementing idea 3 as outlined in SSheldon/rust-objc#112 (comment). Not quite happy with the fact that we use fully qualified method calls, which means reborrows are sometimes necessary (see diff in
objc2-foundation/src/array.rsandobjc2-foundation/src/data.rs, may or may not be a big problem in practice?).I'm reluctant to do idea 2 (add
msg_send_mut!) since we would also needmsg_send_bool_mut!andmsg_send_id_mut!which is quite cumbersome!