Struct rustc_middle::ty::instance::Instance [−][src]
A monomorphized InstanceDef
.
Monomorphization happens on-the-fly and no monomorphized MIR is ever created. Instead, this type
simply couples a potentially generic InstanceDef
with some substs, and codegen and const eval
will do all required substitution as they run.
Fields
def: InstanceDef<'tcx>
substs: SubstsRef<'tcx>
Implementations
impl<'tcx> Instance<'tcx>
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fn fn_sig_for_fn_abi(&self, tcx: TyCtxt<'tcx>) -> PolyFnSig<'tcx>
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impl<'tcx> Instance<'tcx>
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pub fn ty(&self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Ty<'tcx>
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Returns the Ty
corresponding to this Instance
, with generic substitutions applied and
lifetimes erased, allowing a ParamEnv
to be specified for use during normalization.
pub fn upstream_monomorphization(&self, tcx: TyCtxt<'tcx>) -> Option<CrateNum>
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Finds a crate that contains a monomorphization of this instance that
can be linked to from the local crate. A return value of None
means
no upstream crate provides such an exported monomorphization.
This method already takes into account the global -Zshare-generics
setting, always returning None
if share-generics
is off.
impl<'tcx> Instance<'tcx>
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pub fn new(def_id: DefId, substs: SubstsRef<'tcx>) -> Instance<'tcx>
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pub fn mono(tcx: TyCtxt<'tcx>, def_id: DefId) -> Instance<'tcx>
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pub fn def_id(&self) -> DefId
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pub fn resolve(
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>
) -> Result<Option<Instance<'tcx>>, ErrorReported>
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tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>
) -> Result<Option<Instance<'tcx>>, ErrorReported>
Resolves a (def_id, substs)
pair to an (optional) instance – most commonly,
this is used to find the precise code that will run for a trait method invocation,
if known.
Returns Ok(None)
if we cannot resolve Instance
to a specific instance.
For example, in a context like this,
fn foo<T: Debug>(t: T) { ... }
trying to resolve Debug::fmt
applied to T
will yield Ok(None)
, because we do not
know what code ought to run. (Note that this setting is also affected by the
RevealMode
in the parameter environment.)
Presuming that coherence and type-check have succeeded, if this method is invoked
in a monomorphic context (i.e., like during codegen), then it is guaranteed to return
Ok(Some(instance))
.
Returns Err(ErrorReported)
when the Instance
resolution process
couldn’t complete due to errors elsewhere - this is distinct
from Ok(None)
to avoid misleading diagnostics when an error
has already been/will be emitted, for the original cause
pub fn resolve_opt_const_arg(
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def: WithOptConstParam<DefId>,
substs: SubstsRef<'tcx>
) -> Result<Option<Instance<'tcx>>, ErrorReported>
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tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def: WithOptConstParam<DefId>,
substs: SubstsRef<'tcx>
) -> Result<Option<Instance<'tcx>>, ErrorReported>
pub fn resolve_for_fn_ptr(
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>
) -> Option<Instance<'tcx>>
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tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>
) -> Option<Instance<'tcx>>
pub fn resolve_for_vtable(
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>
) -> Option<Instance<'tcx>>
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tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>
) -> Option<Instance<'tcx>>
pub fn resolve_closure(
tcx: TyCtxt<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>,
requested_kind: ClosureKind
) -> Instance<'tcx>
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tcx: TyCtxt<'tcx>,
def_id: DefId,
substs: SubstsRef<'tcx>,
requested_kind: ClosureKind
) -> Instance<'tcx>
pub fn resolve_drop_in_place(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Instance<'tcx>
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pub fn fn_once_adapter_instance(
tcx: TyCtxt<'tcx>,
closure_did: DefId,
substs: SubstsRef<'tcx>
) -> Instance<'tcx>
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tcx: TyCtxt<'tcx>,
closure_did: DefId,
substs: SubstsRef<'tcx>
) -> Instance<'tcx>
fn substs_for_mir_body(&self) -> Option<SubstsRef<'tcx>>
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Depending on the kind of InstanceDef
, the MIR body associated with an
instance is expressed in terms of the generic parameters of self.def_id()
, and in other
cases the MIR body is expressed in terms of the types found in the substitution array.
In the former case, we want to substitute those generic types and replace them with the
values from the substs when monomorphizing the function body. But in the latter case, we
don’t want to do that substitution, since it has already been done effectively.
This function returns Some(substs)
in the former case and None
otherwise – i.e., if
this function returns None
, then the MIR body does not require substitution during
codegen.
pub fn subst_mir<T>(&self, tcx: TyCtxt<'tcx>, v: &T) -> T where
T: TypeFoldable<'tcx> + Copy,
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T: TypeFoldable<'tcx> + Copy,
pub fn subst_mir_and_normalize_erasing_regions<T>(
&self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
v: T
) -> T where
T: TypeFoldable<'tcx> + Clone,
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&self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
v: T
) -> T where
T: TypeFoldable<'tcx> + Clone,
pub fn polymorphize(self, tcx: TyCtxt<'tcx>) -> Self
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Returns a new Instance
where generic parameters in instance.substs
are replaced by
identity parameters if they are determined to be unused in instance.def
.
Trait Implementations
impl<'tcx> Clone for Instance<'tcx>
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impl<'tcx> Copy for Instance<'tcx>
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impl<'tcx> Debug for Instance<'tcx>
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impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for Instance<'tcx>
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impl<'tcx> Display for Instance<'tcx>
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impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for Instance<'tcx>
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impl<'tcx> Eq for Instance<'tcx>
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impl<'tcx> Hash for Instance<'tcx>
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fn hash<__H: Hasher>(&self, state: &mut __H)
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pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Instance<'tcx>
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fn hash_stable(
&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
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&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
impl<'tcx, '__lifted> Lift<'__lifted> for Instance<'tcx>
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type Lifted = Instance<'__lifted>
fn lift_to_tcx(self, __tcx: TyCtxt<'__lifted>) -> Option<Instance<'__lifted>>
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impl<'tcx> PartialEq<Instance<'tcx>> for Instance<'tcx>
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impl<'tcx> StructuralEq for Instance<'tcx>
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impl<'tcx> StructuralPartialEq for Instance<'tcx>
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impl<'tcx> TypeFoldable<'tcx> for Instance<'tcx>
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fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
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fn super_visit_with<V: TypeVisitor<'tcx>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
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&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
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fn visit_with<V: TypeVisitor<'tcx>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
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&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
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fn has_escaping_bound_vars(&self) -> bool
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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_opaque_types(&self) -> bool
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fn references_error(&self) -> bool
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fn has_param_types_or_consts(&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_infer_types_or_consts(&self) -> bool
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fn needs_infer(&self) -> bool
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fn has_placeholders(&self) -> bool
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fn needs_subst(&self) -> bool
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fn has_free_regions(&self) -> bool
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fn has_erased_regions(&self) -> bool
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fn has_erasable_regions(&self) -> bool
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fn is_global(&self) -> bool
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fn has_late_bound_regions(&self) -> bool
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fn still_further_specializable(&self) -> bool
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Auto Trait Implementations
impl<'tcx> !RefUnwindSafe for Instance<'tcx>
impl<'tcx> !Send for Instance<'tcx>
impl<'tcx> !Sync for Instance<'tcx>
impl<'tcx> Unpin for Instance<'tcx>
impl<'tcx> !UnwindSafe for Instance<'tcx>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where
T: Copy,
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T: Copy,
pub fn allocate_on(Self, &'a Arena<'tcx>) -> &'a mut T
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pub fn allocate_from_iter(
&'a Arena<'tcx>,
impl IntoIterator<Item = T>
) -> &'a mut [T]ⓘ
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&'a Arena<'tcx>,
impl IntoIterator<Item = T>
) -> &'a mut [T]ⓘ
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<'a, T> Captures<'a> for T where
T: ?Sized,
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T: ?Sized,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> MaybeResult<T> for T
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type Error = !
pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T
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pub fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>
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impl<'tcx, T> Subst<'tcx> for T where
T: TypeFoldable<'tcx>,
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T: TypeFoldable<'tcx>,
pub fn subst_spanned(Self, TyCtxt<'tcx>, &[GenericArg<'tcx>], Option<Span>) -> T
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fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> Self
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.