pub struct Instance<'tcx> {
pub def: InstanceKind<'tcx>,
pub args: GenericArgsRef<'tcx>,
}
Expand description
An InstanceKind
along with the args that are needed to substitute the instance.
Monomorphization happens on-the-fly and no monomorphized MIR is ever created. Instead, this type
simply couples a potentially generic InstanceKind
with some args, and codegen and const eval
will do all required instantiations as they run.
Note: the Lift
impl is currently not used by rustc, but is used by
rustc_codegen_cranelift when the jit
feature is enabled.
Fields§
§def: InstanceKind<'tcx>
§args: GenericArgsRef<'tcx>
Implementations§
Source§impl<'tcx> Instance<'tcx>
impl<'tcx> Instance<'tcx>
Sourcepub fn ty(&self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Ty<'tcx>
pub fn ty(&self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Ty<'tcx>
Returns the Ty
corresponding to this Instance
, with generic instantiations applied and
lifetimes erased, allowing a ParamEnv
to be specified for use during normalization.
Sourcepub fn upstream_monomorphization(&self, tcx: TyCtxt<'tcx>) -> Option<CrateNum>
pub fn upstream_monomorphization(&self, tcx: TyCtxt<'tcx>) -> Option<CrateNum>
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.
Source§impl<'tcx> Instance<'tcx>
impl<'tcx> Instance<'tcx>
pub fn new(def_id: DefId, args: GenericArgsRef<'tcx>) -> Instance<'tcx>
pub fn mono(tcx: TyCtxt<'tcx>, def_id: DefId) -> Instance<'tcx>
pub fn def_id(&self) -> DefId
Sourcepub fn try_resolve(
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
def_id: DefId,
args: GenericArgsRef<'tcx>,
) -> Result<Option<Instance<'tcx>>, ErrorGuaranteed>
pub fn try_resolve( tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>, ) -> Result<Option<Instance<'tcx>>, ErrorGuaranteed>
Resolves a (def_id, args)
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))
, except for when the instance’s inputs hit the type size limit,
in which case it may bail out and return Ok(None)
.
Returns Err(ErrorGuaranteed)
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 expect_resolve( tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>, span: Span, ) -> Instance<'tcx>
pub fn resolve_for_fn_ptr( tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>, ) -> Option<Instance<'tcx>>
pub fn expect_resolve_for_vtable( tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>, span: Span, ) -> Instance<'tcx>
pub fn resolve_closure( tcx: TyCtxt<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>, requested_kind: ClosureKind, ) -> Instance<'tcx>
pub fn resolve_drop_in_place(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Instance<'tcx>
pub fn resolve_async_drop_in_place( tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, ) -> Instance<'tcx>
pub fn fn_once_adapter_instance( tcx: TyCtxt<'tcx>, closure_did: DefId, args: GenericArgsRef<'tcx>, ) -> Instance<'tcx>
pub fn try_resolve_item_for_coroutine( tcx: TyCtxt<'tcx>, trait_item_id: DefId, trait_id: DefId, rcvr_args: GenericArgsRef<'tcx>, ) -> Option<Instance<'tcx>>
Sourcefn args_for_mir_body(&self) -> Option<GenericArgsRef<'tcx>>
fn args_for_mir_body(&self) -> Option<GenericArgsRef<'tcx>>
Depending on the kind of InstanceKind
, 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 generic parameter array.
In the former case, we want to instantiate those generic types and replace them with the
values from the args when monomorphizing the function body. But in the latter case, we
don’t want to do that instantiation, since it has already been done effectively.
This function returns Some(args)
in the former case and None
otherwise – i.e., if
this function returns None
, then the MIR body does not require instantiation during
codegen.
pub fn instantiate_mir<T>( &self, tcx: TyCtxt<'tcx>, v: EarlyBinder<'tcx, &T>, ) -> T
pub fn instantiate_mir_and_normalize_erasing_regions<T>(
&self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
v: EarlyBinder<'tcx, T>,
) -> Twhere
T: TypeFoldable<TyCtxt<'tcx>>,
pub fn try_instantiate_mir_and_normalize_erasing_regions<T>(
&self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
v: EarlyBinder<'tcx, T>,
) -> Result<T, NormalizationError<'tcx>>where
T: TypeFoldable<TyCtxt<'tcx>>,
Sourcepub fn polymorphize(self, tcx: TyCtxt<'tcx>) -> Self
pub fn polymorphize(self, tcx: TyCtxt<'tcx>) -> Self
Returns a new Instance
where generic parameters in instance.args
are replaced by
identity parameters if they are determined to be unused in instance.def
.
Trait Implementations§
Source§impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Instance<'tcx>
impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Instance<'tcx>
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )
Source§impl<'tcx> Key for Instance<'tcx>
impl<'tcx> Key for Instance<'tcx>
type Cache<V> = DefaultCache<Instance<'tcx>, V>
Source§fn default_span(&self, tcx: TyCtxt<'_>) -> Span
fn default_span(&self, tcx: TyCtxt<'_>) -> Span
self
, what span should we use?Source§fn key_as_def_id(&self) -> Option<DefId>
fn key_as_def_id(&self) -> Option<DefId>
fn ty_def_id(&self) -> Option<DefId>
Source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for Instance<'tcx>
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for Instance<'tcx>
Source§fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
__folder: &mut __F,
) -> Result<Self, __F::Error>
fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, __folder: &mut __F, ) -> Result<Self, __F::Error>
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for use with infallible
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.Source§impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for Instance<'tcx>
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for Instance<'tcx>
Source§fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>(
&self,
__visitor: &mut __V,
) -> __V::Result
fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>( &self, __visitor: &mut __V, ) -> __V::Result
impl<'tcx> Copy for Instance<'tcx>
impl<'tcx> Eq for Instance<'tcx>
impl<'tcx> StructuralPartialEq for Instance<'tcx>
Auto Trait Implementations§
impl<'tcx> DynSend for Instance<'tcx>
impl<'tcx> DynSync for Instance<'tcx>
impl<'tcx> Freeze for Instance<'tcx>
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§
Source§impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T
fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]
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fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]
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default fn fingerprint_style() -> FingerprintStyle
Source§default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
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Size: 32 bytes