Enum rustc_middle::mir::ConstantKind

pub enum ConstantKind<'tcx> {
    Ty(&'tcx Const<'tcx>),
    Val(ConstValue<'tcx>, Ty<'tcx>),
}

Variants

Ty(&'tcx Const<'tcx>)

This constant came from the type system

Val(ConstValue<'tcx>, Ty<'tcx>)

This constant cannot go back into the type system, as it represents something the type system cannot handle (e.g. pointers).

Implementations

impl<'tcx> ConstantKind<'tcx>

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

Returns None if the constant is not trivially safe for use in the type system.

pub fn ty(&self) -> Ty<'tcx>

pub fn try_to_value(self) -> Option<ConstValue<'tcx>>

pub fn try_to_scalar(self) -> Option<Scalar>

pub fn try_to_scalar_int(self) -> Option<ScalarInt>

pub fn try_to_bits(self, size: Size) -> Option<u128>

pub fn try_to_bool(self) -> Option<bool>

pub fn try_eval_bits(
    &self,
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    ty: Ty<'tcx>
) -> Option<u128>

pub fn try_eval_bool(
    &self,
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>
) -> Option<bool>

pub fn try_eval_usize(
    &self,
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>
) -> Option<u64>

Trait Implementations

impl<'tcx> Clone for ConstantKind<'tcx>

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

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Debug for ConstantKind<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for ConstantKind<'tcx>

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<'tcx> Display for ConstantKind<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for ConstantKind<'tcx>

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl<'tcx> From<&'tcx Const<'tcx>> for ConstantKind<'tcx>

fn from(ct: &'tcx Const<'tcx>) -> Self

Performs the conversion.

impl<'tcx> Hash for ConstantKind<'tcx>

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ConstantKind<'tcx>

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

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

type Lifted = ConstantKind<'__lifted>

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

impl<'tcx> PartialEq<ConstantKind<'tcx>> for ConstantKind<'tcx>

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &ConstantKind<'tcx>) -> bool

This method tests for !=.

impl<'tcx> PartialOrd<ConstantKind<'tcx>> for ConstantKind<'tcx>

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

This method returns an ordering between self and other values if one exists.

#[must_use]

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'tcx> TypeFoldable<'tcx> for ConstantKind<'tcx>

fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self

fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self

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

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

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.

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

Returns true if this self has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

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

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn has_param_types_or_consts(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_infer_types_or_consts(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

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.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

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.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

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.

impl<'tcx> Copy for ConstantKind<'tcx>

impl<'tcx> Eq for ConstantKind<'tcx>

impl<'tcx> StructuralEq for ConstantKind<'tcx>

impl<'tcx> StructuralPartialEq for ConstantKind<'tcx>