Enum rustc_middle::mir::MirPhase

pub enum MirPhase {
    Build,
    Const,
    ConstPromotion,
    DropLowering,
    GeneratorLowering,
    Optimization,
}

The various “big phases” that MIR goes through.

These phases all describe dialects of MIR. Since all MIR uses the same datastructures, the dialects forbid certain variants or values in certain phases.

Note: Each phase’s validation checks all invariants of the previous phases’ dialects. A phase that changes the dialect documents what invariants must be upheld after that phase finishes.

Warning: ordering of variants is significant.

Variants

Build

Const

ConstPromotion

This phase checks the MIR for promotable elements and takes them out of the main MIR body by creating a new MIR body per promoted element. After this phase (and thus the termination of the mir_promoted query), these promoted elements are available in the promoted_mir query.

DropLowering

After this phase

• the only AggregateKinds allowed are Array and Generator,
• DropAndReplace is gone for good
• Drop now uses explicit drop flags visible in the MIR and reaching a Drop terminator means that the auto-generated drop glue will be invoked.

GeneratorLowering

After this phase, generators are explicit state machines (no more Yield). AggregateKind::Generator is gone for good.

Optimization

Implementations

impl MirPhase

pub fn phase_index(&self) -> usize

Gets the index of the current MirPhase within the set of all MirPhases.

Trait Implementations

impl Clone for MirPhase

fn clone(&self) -> MirPhase

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for MirPhase

impl Debug for MirPhase

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

Formats the value using the given formatter.

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

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

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

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

impl Eq for MirPhase

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for MirPhase

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

impl<'tcx> Lift<'tcx> for MirPhase

type Lifted = Self

fn lift_to_tcx(self, _: TyCtxt<'tcx>) -> Option<Self>

impl Ord for MirPhase

fn cmp(&self, other: &MirPhase) -> Ordering

This method returns an Ordering between self and other.

#[must_use]pub fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]pub fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<MirPhase> for MirPhase

fn eq(&self, other: &MirPhase) -> bool

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

#[must_use]pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialOrd<MirPhase> for MirPhase

fn partial_cmp(&self, other: &MirPhase) -> Option<Ordering>

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

#[must_use]pub fn lt(&self, other: &Rhs) -> bool

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

#[must_use]pub 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]pub fn gt(&self, other: &Rhs) -> bool

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

#[must_use]pub 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 StructuralEq for MirPhase

impl StructuralPartialEq for MirPhase

impl<'tcx> TypeFoldable<'tcx> for MirPhase

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

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

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

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.