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Auto merge of rust-lang#116138 - RalfJung:miri, r=RalfJung
Miri subtree update r? `@ghost`
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111 changes: 111 additions & 0 deletions
111
src/tools/miri/src/borrow_tracker/tree_borrows/exhaustive.rs
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| //! Exhaustive testing utilities. | ||
| //! (These are used in Tree Borrows `#[test]`s for thorough verification | ||
| //! of the behavior of the state machine of permissions, | ||
| //! but the contents of this file are extremely generic) | ||
| #![cfg(test)] | ||
|
|
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| pub trait Exhaustive: Sized { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>>; | ||
| } | ||
|
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| macro_rules! precondition { | ||
| ($cond:expr) => { | ||
| if !$cond { | ||
| continue; | ||
| } | ||
| }; | ||
| } | ||
| pub(crate) use precondition; | ||
|
|
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| // Trivial impls of `Exhaustive` for the standard types with 0, 1 and 2 elements respectively. | ||
|
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| impl Exhaustive for ! { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(std::iter::empty()) | ||
| } | ||
| } | ||
|
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| impl Exhaustive for () { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(std::iter::once(())) | ||
| } | ||
| } | ||
|
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| impl Exhaustive for bool { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(vec![true, false].into_iter()) | ||
| } | ||
| } | ||
|
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| // Some container impls for `Exhaustive`. | ||
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| impl<T> Exhaustive for Option<T> | ||
| where | ||
| T: Exhaustive + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(std::iter::once(None).chain(T::exhaustive().map(Some))) | ||
| } | ||
| } | ||
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| impl<T1, T2> Exhaustive for (T1, T2) | ||
| where | ||
| T1: Exhaustive + Clone + 'static, | ||
| T2: Exhaustive + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(T1::exhaustive().flat_map(|t1| T2::exhaustive().map(move |t2| (t1.clone(), t2)))) | ||
| } | ||
| } | ||
|
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| impl<T> Exhaustive for [T; 1] | ||
| where | ||
| T: Exhaustive + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(T::exhaustive().map(|t| [t])) | ||
| } | ||
| } | ||
|
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| impl<T> Exhaustive for [T; 2] | ||
| where | ||
| T: Exhaustive + Clone + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(T::exhaustive().flat_map(|t1| T::exhaustive().map(move |t2| [t1.clone(), t2]))) | ||
| } | ||
| } | ||
|
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| impl<T> Exhaustive for [T; 3] | ||
| where | ||
| T: Exhaustive + Clone + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new( | ||
| <[T; 2]>::exhaustive() | ||
| .flat_map(|[t1, t2]| T::exhaustive().map(move |t3| [t1.clone(), t2.clone(), t3])), | ||
| ) | ||
| } | ||
| } | ||
|
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| impl<T> Exhaustive for [T; 4] | ||
| where | ||
| T: Exhaustive + Clone + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(<[T; 2]>::exhaustive().flat_map(|[t1, t2]| { | ||
| <[T; 2]>::exhaustive().map(move |[t3, t4]| [t1.clone(), t2.clone(), t3, t4]) | ||
| })) | ||
| } | ||
| } | ||
|
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| impl<T> Exhaustive for [T; 5] | ||
| where | ||
| T: Exhaustive + Clone + 'static, | ||
| { | ||
| fn exhaustive() -> Box<dyn Iterator<Item = Self>> { | ||
| Box::new(<[T; 2]>::exhaustive().flat_map(|[t1, t2]| { | ||
| <[T; 3]>::exhaustive().map(move |[t3, t4, t5]| [t1.clone(), t2.clone(), t3, t4, t5]) | ||
| })) | ||
| } | ||
| } |
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