pub enum InstanceDef<'tcx> {
Show 13 variants Item(DefId), Intrinsic(DefId), VTableShim(DefId), ReifyShim(DefId), FnPtrShim(DefId, Ty<'tcx>), Virtual(DefId, usize), ClosureOnceShim { call_once: DefId, track_caller: bool, }, ConstructCoroutineInClosureShim { coroutine_closure_def_id: DefId, target_kind: ClosureKind, }, CoroutineKindShim { coroutine_def_id: DefId, target_kind: ClosureKind, }, ThreadLocalShim(DefId), DropGlue(DefId, Option<Ty<'tcx>>), CloneShim(DefId, Ty<'tcx>), FnPtrAddrShim(DefId, Ty<'tcx>),
}

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Item(DefId)

A user-defined callable item.

This includes:

  • fn items
  • closures
  • coroutines
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Intrinsic(DefId)

An intrinsic fn item (with "rust-intrinsic" or "platform-intrinsic" ABI).

Alongside Virtual, this is the only InstanceDef that does not have its own callable MIR. Instead, codegen and const eval “magically” evaluate calls to intrinsics purely in the caller.

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VTableShim(DefId)

<T as Trait>::method where method receives unsizeable self: Self (part of the unsized_locals feature).

The generated shim will take Self via *mut Self - conceptually this is &owned Self - and dereference the argument to call the original function.

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ReifyShim(DefId)

fn() pointer where the function itself cannot be turned into a pointer.

One example is <dyn Trait as Trait>::fn, where the shim contains a virtual call, which codegen supports only via a direct call to the <dyn Trait as Trait>::fn instance (an InstanceDef::Virtual).

Another example is functions annotated with #[track_caller], which must have their implicit caller location argument populated for a call. Because this is a required part of the function’s ABI but can’t be tracked as a property of the function pointer, we use a single “caller location” (the definition of the function itself).

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FnPtrShim(DefId, Ty<'tcx>)

<fn() as FnTrait>::call_* (generated FnTrait implementation for fn() pointers).

DefId is FnTrait::call_*.

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Virtual(DefId, usize)

Dynamic dispatch to <dyn Trait as Trait>::fn.

This InstanceDef does not have callable MIR. Calls to Virtual instances must be codegen’d as virtual calls through the vtable.

If this is reified to a fn pointer, a ReifyShim is used (see ReifyShim above for more details on that).

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ClosureOnceShim

Fields

§call_once: DefId
§track_caller: bool

<[FnMut/Fn closure] as FnOnce>::call_once.

The DefId is the ID of the call_once method in FnOnce.

This generates a body that will just borrow the (owned) self type, and dispatch to the FnMut::call_mut instance for the closure.

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ConstructCoroutineInClosureShim

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§coroutine_closure_def_id: DefId
§target_kind: ClosureKind

<[FnMut/Fn coroutine-closure] as FnOnce>::call_once or <[Fn coroutine-closure] as FnMut>::call_mut.

The body generated here differs significantly from the ClosureOnceShim, since we need to generate a distinct coroutine type that will move the closure’s upvars out of the closure.

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CoroutineKindShim

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§coroutine_def_id: DefId
§target_kind: ClosureKind

<[coroutine] as Future>::poll, but for coroutines produced when AsyncFnOnce is called on a coroutine-closure whose closure kind greater than FnOnce, or similarly for AsyncFnMut.

This will select the body that is produced by the ByMoveBody transform, and thus take and use all of its upvars by-move rather than by-ref.

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ThreadLocalShim(DefId)

Compiler-generated accessor for thread locals which returns a reference to the thread local the DefId defines. This is used to export thread locals from dylibs on platforms lacking native support.

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DropGlue(DefId, Option<Ty<'tcx>>)

core::ptr::drop_in_place::<T>.

The DefId is for core::ptr::drop_in_place. The Option<Ty<'tcx>> is either Some(T), or None for empty drop glue.

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CloneShim(DefId, Ty<'tcx>)

Compiler-generated <T as Clone>::clone implementation.

For all types that automatically implement Copy, a trivial Clone impl is provided too. Additionally, arrays, tuples, and closures get a Clone shim even if they aren’t Copy.

The DefId is for Clone::clone, the Ty is the type T with the builtin Clone impl.

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FnPtrAddrShim(DefId, Ty<'tcx>)

Compiler-generated <T as FnPtr>::addr implementation.

Automatically generated for all potentially higher-ranked fn(I) -> R types.

The DefId is for FnPtr::addr, the Ty is the type T.

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impl<'tcx> InstanceDef<'tcx>

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pub fn def_id(self) -> DefId

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pub fn def_id_if_not_guaranteed_local_codegen(self) -> Option<DefId>

Returns the DefId of instances which might not require codegen locally.

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pub fn get_attrs( &self, tcx: TyCtxt<'tcx>, attr: Symbol ) -> impl Iterator<Item = &'tcx Attribute>

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pub fn requires_inline(&self, tcx: TyCtxt<'tcx>) -> bool

Returns true if the LLVM version of this instance is unconditionally marked with inline. This implies that a copy of this instance is generated in every codegen unit. Note that this is only a hint. See the documentation for generates_cgu_internal_copy for more information.

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pub fn generates_cgu_internal_copy(&self, tcx: TyCtxt<'tcx>) -> bool

Returns true if the machine code for this instance is instantiated in each codegen unit that references it. Note that this is only a hint! The compiler can globally decide to not do this in order to speed up compilation. CGU-internal copies are only exist to enable inlining. If inlining is not performed (e.g. at -Copt-level=0) then the time for generating them is wasted and it’s better to create a single copy with external linkage.

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pub fn requires_caller_location(&self, tcx: TyCtxt<'_>) -> bool

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pub fn has_polymorphic_mir_body(&self) -> bool

Returns true when the MIR body associated with this instance should be monomorphized by its users (e.g. codegen or miri) by instantiating the args from Instance (see Instance::args_for_mir_body).

Otherwise, returns false only for some kinds of shims where the construction of the MIR body should perform necessary instantiations.

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impl<'tcx> AsLocalKey for InstanceDef<'tcx>

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type LocalKey = InstanceDef<'tcx>

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fn as_local_key(&self) -> Option<Self::LocalKey>

Given an instance of this key, what crate is it referring to? This is used to find the provider.
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impl<'tcx> Clone for InstanceDef<'tcx>

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fn clone(&self) -> InstanceDef<'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 InstanceDef<'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, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for InstanceDef<'tcx>

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fn decode(__decoder: &mut __D) -> Self

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impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for InstanceDef<'tcx>

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fn encode(&self, __encoder: &mut __E)

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impl<'tcx> EraseType for InstanceDef<'tcx>

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type Result = [u8; 24]

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impl<'tcx> Hash for InstanceDef<'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<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for InstanceDef<'tcx>

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

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impl<'tcx> Key for InstanceDef<'tcx>

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type CacheSelector = DefaultCacheSelector<InstanceDef<'tcx>>

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fn default_span(&self, tcx: 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_def_id(&self) -> Option<DefId>

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impl<'tcx, '__lifted> Lift<'__lifted> for InstanceDef<'tcx>

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type Lifted = InstanceDef<'__lifted>

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fn lift_to_tcx(self, __tcx: TyCtxt<'__lifted>) -> Option<InstanceDef<'__lifted>>

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impl<'tcx> Ord for InstanceDef<'tcx>

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fn cmp(&self, other: &InstanceDef<'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 InstanceDef<'tcx>

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fn eq(&self, other: &InstanceDef<'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 InstanceDef<'tcx>

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fn partial_cmp(&self, other: &InstanceDef<'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> TypeFoldable<TyCtxt<'tcx>> for InstanceDef<'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 InstanceDef<'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 InstanceDef<'tcx>

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impl<'tcx> Eq for InstanceDef<'tcx>

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impl<'tcx> StructuralPartialEq for InstanceDef<'tcx>

Auto Trait Implementations§

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impl<'tcx> DynSend for InstanceDef<'tcx>

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impl<'tcx> DynSync for InstanceDef<'tcx>

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

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impl<'tcx> Send for InstanceDef<'tcx>

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impl<'tcx> Sync for InstanceDef<'tcx>

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impl<'tcx> Unpin for InstanceDef<'tcx>

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impl<'tcx> !UnwindSafe for InstanceDef<'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<T> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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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<'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<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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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<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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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<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> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. 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> 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, 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> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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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 error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>

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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_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 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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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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_error: &CycleError, _guar: ErrorGuaranteed ) -> 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,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,

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: 24 bytes

Size for each variant:

  • Item: 11 bytes
  • Intrinsic: 11 bytes
  • VTableShim: 11 bytes
  • ReifyShim: 11 bytes
  • FnPtrShim: 23 bytes
  • Virtual: 23 bytes
  • ClosureOnceShim: 11 bytes
  • ConstructCoroutineInClosureShim: 11 bytes
  • CoroutineKindShim: 11 bytes
  • ThreadLocalShim: 11 bytes
  • DropGlue: 23 bytes
  • CloneShim: 23 bytes
  • FnPtrAddrShim: 23 bytes