Struct rustc_middle::ty::GenericArg

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pub struct GenericArg<'tcx> {
    ptr: NonZeroUsize,
    marker: PhantomData<(Ty<'tcx>, Region<'tcx>, Const<'tcx>)>,
}
Expand description

An entity in the Rust type system, which can be one of several kinds (types, lifetimes, and consts). To reduce memory usage, a GenericArg is an interned pointer, with the lowest 2 bits being reserved for a tag to indicate the type (Ty, Region, or Const) it points to.

Note: the PartialEq, Eq and Hash derives are only valid because Ty, Region and Const are all interned.

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§ptr: NonZeroUsize§marker: PhantomData<(Ty<'tcx>, Region<'tcx>, Const<'tcx>)>

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impl<'tcx> GenericArg<'tcx>

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pub fn walk(self) -> TypeWalker<'tcx>

Iterator that walks self and any types reachable from self, in depth-first order. Note that just walks the types that appear in self, it does not descend into the fields of structs or variants. For example:

isize => { isize }
Foo<Bar<isize>> => { Foo<Bar<isize>>, Bar<isize>, isize }
[isize] => { [isize], isize }
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pub fn walk_shallow( self, visited: &mut SsoHashSet<GenericArg<'tcx>> ) -> impl Iterator<Item = GenericArg<'tcx>>

Iterator that walks the immediate children of self. Hence Foo<Bar<i32>, u32> yields the sequence [Bar<i32>, u32] (but not i32, like walk).

Iterator only walks items once. It accepts visited set, updates it with all visited types and skips any types that are already there.

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impl<'tcx> GenericArg<'tcx>

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pub fn unpack(self) -> GenericArgKind<'tcx>

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pub fn as_type(self) -> Option<Ty<'tcx>>

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pub fn as_region(self) -> Option<Region<'tcx>>

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pub fn as_const(self) -> Option<Const<'tcx>>

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pub fn expect_region(self) -> Region<'tcx>

Unpack the GenericArg as a region when it is known certainly to be a region.

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pub fn expect_ty(self) -> Ty<'tcx>

Unpack the GenericArg as a type when it is known certainly to be a type. This is true in cases where GenericArgs is used in places where the kinds are known to be limited (e.g. in tuples, where the only parameters are type parameters).

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pub fn expect_const(self) -> Const<'tcx>

Unpack the GenericArg as a const when it is known certainly to be a const.

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pub fn is_non_region_infer(self) -> bool

Trait Implementations§

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impl<'tcx> Clone for GenericArg<'tcx>

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fn clone(&self) -> GenericArg<'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for GenericArg<'tcx>

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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<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for GenericArg<'tcx>

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fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>( this: WithInfcx<'_, Infcx, &Self>, f: &mut Formatter<'_> ) -> Result

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impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for GenericArg<'tcx>

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impl<'tcx> Display for GenericArg<'tcx>

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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<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for GenericArg<'tcx>

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fn encode(&self, e: &mut E)

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impl<'tcx> EraseType for GenericArg<'tcx>

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type Result = [u8; 8]

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impl<'tcx> From<Const<'tcx>> for GenericArg<'tcx>

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fn from(c: Const<'tcx>) -> GenericArg<'tcx>

Converts to this type from the input type.
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impl<'tcx> From<Region<'tcx>> for GenericArg<'tcx>

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fn from(r: Region<'tcx>) -> GenericArg<'tcx>

Converts to this type from the input type.
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impl<'tcx> From<Term<'tcx>> for GenericArg<'tcx>

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fn from(value: Term<'tcx>) -> Self

Converts to this type from the input type.
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impl<'tcx> From<Ty<'tcx>> for GenericArg<'tcx>

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fn from(ty: Ty<'tcx>) -> GenericArg<'tcx>

Converts to this type from the input type.
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impl<'tcx> Hash for GenericArg<'tcx>

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for GenericArg<'tcx>

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fn hash_stable( &self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher )

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impl<'tcx> IntoDiagnosticArg for GenericArg<'tcx>

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impl<'tcx> Key for GenericArg<'tcx>

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type CacheSelector = DefaultCacheSelector<GenericArg<'tcx>>

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fn default_span(&self, _: TyCtxt<'_>) -> Span

In the event that a cycle occurs, if no explicit span has been given for a query with key self, what span should we use?
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fn key_as_def_id(&self) -> Option<DefId>

If the key is a DefId or DefId–equivalent, return that DefId. Otherwise, return None.
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fn ty_adt_id(&self) -> Option<DefId>

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impl<'a, 'tcx> Lift<'tcx> for GenericArg<'a>

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type Lifted = GenericArg<'tcx>

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fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted>

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impl<'tcx> Ord for GenericArg<'tcx>

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fn cmp(&self, other: &GenericArg<'tcx>) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl<'tcx> PartialEq for GenericArg<'tcx>

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fn eq(&self, other: &GenericArg<'tcx>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'tcx> PartialOrd for GenericArg<'tcx>

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fn partial_cmp(&self, other: &GenericArg<'tcx>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<'tcx, P: PrettyPrinter<'tcx>> Print<'tcx, P> for GenericArg<'tcx>

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impl<'tcx> Relate<'tcx> for GenericArg<'tcx>

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fn relate<R: TypeRelation<'tcx>>( relation: &mut R, a: GenericArg<'tcx>, b: GenericArg<'tcx> ) -> RelateResult<'tcx, GenericArg<'tcx>>

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impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for GenericArg<'tcx>

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fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, folder: &mut F ) -> Result<Self, F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
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fn fold_with<F>(self, folder: &mut F) -> Self
where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for GenericArg<'tcx>

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fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>( &self, visitor: &mut V ) -> ControlFlow<V::BreakTy>

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more
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impl<'tcx> Copy for GenericArg<'tcx>

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impl<'tcx> Eq for GenericArg<'tcx>

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impl<'tcx> StructuralEq for GenericArg<'tcx>

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impl<'tcx> StructuralPartialEq for GenericArg<'tcx>

Auto Trait Implementations§

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impl<'tcx> DynSend for GenericArg<'tcx>

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impl<'tcx> DynSync for GenericArg<'tcx>

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impl<'tcx> !RefUnwindSafe for GenericArg<'tcx>

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impl<'tcx> Send for GenericArg<'tcx>

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impl<'tcx> Sync for GenericArg<'tcx>

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impl<'tcx> Unpin for GenericArg<'tcx>

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impl<'tcx> !UnwindSafe for GenericArg<'tcx>

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<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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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<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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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, 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<P> IntoQueryParam<P> for P

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impl<'tcx, T> IsSuggestable<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,

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fn is_suggestable(self, tcx: TyCtxt<'tcx>, infer_suggestable: bool) -> bool

Whether this makes sense to suggest in a diagnostic. Read more
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fn make_suggestable( self, tcx: TyCtxt<'tcx>, infer_suggestable: bool ) -> Option<T>

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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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<'tcx, T> TypeVisitableExt<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>>,

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fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.
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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).
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fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former. Read more
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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_projections(&self) -> bool

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fn has_inherent_projections(&self) -> bool

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fn has_opaque_types(&self) -> bool

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fn has_coroutines(&self) -> bool

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fn references_error(&self) -> bool

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fn error_reported(&self) -> Result<(), ErrorGuaranteed>

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.
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fn has_erased_regions(&self) -> bool

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fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
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fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.
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fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool

True if there are any bound variables
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fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.
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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T

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: 8 bytes