Struct rustc_type_ir::search_graph::NestedGoals

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struct NestedGoals<X: Cx> {
    nested_goals: HashMap<X::Input, UsageKind>,
}
Expand description

The nested goals of each stack entry and the path from the stack entry to that nested goal.

We only start tracking nested goals once we’ve either encountered overflow or a solver cycle. This is a performance optimization to avoid tracking nested goals on the happy path.

We use nested goals for two reasons:

  • when rebasing provisional cache entries
  • when checking whether we have to ignore a global cache entry as reevaluating it would encounter a cycle or use a provisional cache entry.

We need to disable the global cache if using it would hide a cycle, as cycles can impact behavior. The cycle ABA may have different final results from a the cycle BAB depending on the cycle root.

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§nested_goals: HashMap<X::Input, UsageKind>

Implementations§

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impl<X: Cx> NestedGoals<X>

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fn is_empty(&self) -> bool

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fn insert(&mut self, input: X::Input, path_from_entry: UsageKind)

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fn merge(&mut self, nested_goals: &NestedGoals<X>)

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fn extend_from_child( &mut self, step_kind: PathKind, nested_goals: &NestedGoals<X>, )

Adds the nested goals of a nested goal, given that the path step_kind from this goal to the parent goal.

If the path from this goal to the nested goal is inductive, the paths from this goal to all nested goals of that nested goal are also inductive. Otherwise the paths are the same as for the child.

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fn iter(&self) -> impl Iterator<Item = (X::Input, UsageKind)> + '_

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fn get(&self, input: X::Input) -> Option<UsageKind>

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fn contains(&self, input: X::Input) -> bool

Trait Implementations§

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impl<X> Debug for NestedGoals<X>
where X: Cx,

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fn fmt(&self, __f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<X> Default for NestedGoals<X>
where X: Cx,

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<X> Freeze for NestedGoals<X>

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impl<X> RefUnwindSafe for NestedGoals<X>
where <X as Cx>::Input: RefUnwindSafe,

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impl<X> Send for NestedGoals<X>
where <X as Cx>::Input: Send,

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impl<X> Sync for NestedGoals<X>
where <X as Cx>::Input: Sync,

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impl<X> Unpin for NestedGoals<X>
where <X as Cx>::Input: Unpin,

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impl<X> UnwindSafe for NestedGoals<X>
where <X as Cx>::Input: UnwindSafe,

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes