1a51dd9247
Make unused states of Reserved unrepresentable In the [previous TB update](https://github.com/rust-lang/miri/pull/3742) we discovered that the existence of `Reserved + !ty_is_freeze + protected` is undesirable. This has the side effect of making `Reserved { conflicted: true, ty_is_freeze: false }` unreachable. As such it is desirable that this state would also be unrepresentable. This PR eliminates the unused configuration by changing ```rs enum PermissionPriv { Reserved { ty_is_freeze: bool, conflicted: bool }, ... } ``` into ```rs enum PermissionPriv { ReservedFrz { conflicted: bool }, ReservedIM, ... } ``` but this is not the only solution and `Reserved(Activable | Conflicted | InteriorMut)` could be discussed. In addition to making the unreachable state not representable anymore, this change has the nice side effect of enabling `foreign_read` to no longer depend explicitly on the `protected` flag. Currently waiting for - `@JoJoDeveloping` to confirm that this is the same representation of `Reserved` as what is being implemented in simuliris, - `@RalfJung` to approve that this does not introduce too much overhead in the trusted codebase. |
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