Enum rustc_middle::mir::StatementKind[][src]

pub enum StatementKind<'tcx> {
    Assign(Box<(Place<'tcx>, Rvalue<'tcx>)>),
    FakeRead(Box<(FakeReadCause, Place<'tcx>)>),
    SetDiscriminant {
        place: Box<Place<'tcx>>,
        variant_index: VariantIdx,
    AscribeUserType(Box<(Place<'tcx>, UserTypeProjection)>, Variance),


Assign(Box<(Place<'tcx>, Rvalue<'tcx>)>)
Expand description

Write the RHS Rvalue to the LHS Place.

FakeRead(Box<(FakeReadCause, Place<'tcx>)>)
Expand description

This represents all the reading that a pattern match may do (e.g., inspecting constants and discriminant values), and the kind of pattern it comes from. This is in order to adapt potential error messages to these specific patterns.

Note that this also is emitted for regular let bindings to ensure that locals that are never accessed still get some sanity checks for, e.g., let x: ! = ..;

Expand description

Write the discriminant for a variant to the enum Place.

Show fields

Fields of SetDiscriminant

place: Box<Place<'tcx>>variant_index: VariantIdx
Expand description

Start a live range for the storage of the local.

Expand description

End the current live range for the storage of the local.

Expand description

Executes a piece of inline Assembly. Stored in a Box to keep the size of StatementKind low.

Expand description

Retag references in the given place, ensuring they got fresh tags. This is part of the Stacked Borrows model. These statements are currently only interpreted by miri and only generated when “-Z mir-emit-retag” is passed. See https://internals.rust-lang.org/t/stacked-borrows-an-aliasing-model-for-rust/8153/ for more details.

AscribeUserType(Box<(Place<'tcx>, UserTypeProjection)>, Variance)
Expand description

Encodes a user’s type ascription. These need to be preserved intact so that NLL can respect them. For example:

let a: T = y;

The effect of this annotation is to relate the type T_y of the place y to the user-given type T. The effect depends on the specified variance:

  • Covariant – requires that T_y <: T
  • Contravariant – requires that T_y :> T
  • Invariant – requires that T_y == T
  • Bivariant – no effect
Expand description

Marks the start of a “coverage region”, injected with ‘-Zinstrument-coverage’. A Coverage statement carries metadata about the coverage region, used to inject a coverage map into the binary. If Coverage::kind is a Counter, the statement also generates executable code, to increment a counter variable at runtime, each time the code region is executed.

Expand description

Denotes a call to the intrinsic function copy_overlapping, where src_dst denotes the memory being read from and written to(one field to save memory), and size indicates how many bytes are being copied over.

Expand description

No-op. Useful for deleting instructions without affecting statement indices.


impl<'tcx> StatementKind<'tcx>[src]

pub fn as_assign_mut(&mut self) -> Option<&mut (Place<'tcx>, Rvalue<'tcx>)>[src]

pub fn as_assign(&self) -> Option<&(Place<'tcx>, Rvalue<'tcx>)>[src]

Trait Implementations

impl<'tcx> Clone for StatementKind<'tcx>[src]

fn clone(&self) -> StatementKind<'tcx>[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl<'tcx> Debug for StatementKind<'tcx>[src]

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

Formats the value using the given formatter. Read more

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for StatementKind<'tcx>[src]

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

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for StatementKind<'tcx>[src]

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

impl<'tcx> Hash for StatementKind<'tcx>[src]

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

Feeds this value into the given Hasher. Read more

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

Feeds a slice of this type into the given Hasher. Read more

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for StatementKind<'tcx>[src]

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

impl<'tcx> PartialEq<StatementKind<'tcx>> for StatementKind<'tcx>[src]

fn eq(&self, other: &StatementKind<'tcx>) -> bool[src]

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

fn ne(&self, other: &StatementKind<'tcx>) -> bool[src]

This method tests for !=.

impl<'tcx> TypeFoldable<'tcx> for StatementKind<'tcx>[src]

fn super_fold_with<__F: TypeFolder<'tcx>>(self, __folder: &mut __F) -> Self[src]

fn super_visit_with<__F: TypeVisitor<'tcx>>(
    __folder: &mut __F
) -> ControlFlow<__F::BreakTy>

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

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

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

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. Read more

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

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

fn has_escaping_bound_vars(&self) -> bool[src]

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

fn has_projections(&self) -> bool[src]

fn has_opaque_types(&self) -> bool[src]

fn references_error(&self) -> bool[src]

fn has_param_types_or_consts(&self) -> bool[src]

fn has_infer_regions(&self) -> bool[src]

fn has_infer_types(&self) -> bool[src]

fn has_infer_types_or_consts(&self) -> bool[src]

fn needs_infer(&self) -> bool[src]

fn has_placeholders(&self) -> bool[src]

fn needs_subst(&self) -> bool[src]

fn has_free_regions(&self) -> bool[src]

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more

fn has_erased_regions(&self) -> bool[src]

fn has_erasable_regions(&self) -> bool[src]

True if there are any un-erased free regions.

fn is_global(&self) -> bool[src]

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. Read more

fn has_late_bound_regions(&self) -> bool[src]

True if there are any late-bound regions

fn still_further_specializable(&self) -> bool[src]

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. Read more

impl<'tcx> StructuralPartialEq for StatementKind<'tcx>[src]

Auto Trait Implementations

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

impl<'tcx> !Send for StatementKind<'tcx>

impl<'tcx> !Sync for StatementKind<'tcx>

impl<'tcx> Unpin for StatementKind<'tcx>

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

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, 

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> MaybeResult<T> for T[src]

type Error = !

pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T[src]

pub fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>[src]

impl<'tcx, T> Subst<'tcx> for T where
    T: TypeFoldable<'tcx>, 

pub fn subst_spanned(Self, TyCtxt<'tcx>, &[GenericArg<'tcx>], Option<Span>) -> T[src]

fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> Self[src]

impl<T> ToOwned for T where
    T: Clone

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T where
    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>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.

impl<T> WithConstness for T[src]

fn with_constness(self, constness: Constness) -> ConstnessAnd<Self>[src]

fn with_const(self) -> ConstnessAnd<Self>[src]

fn without_const(self) -> ConstnessAnd<Self>[src]

impl<'a, T> Captures<'a> for T where
    T: ?Sized