Struct rustc_mir_build::thir::pattern::check_match::MatchVisitor

source ·
struct MatchVisitor<'p, 'tcx> {
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    typeck_results: &'tcx TypeckResults<'tcx>,
    thir: &'p Thir<'tcx>,
    lint_level: HirId,
    let_source: LetSource,
    pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>,
    dropless_arena: &'p DroplessArena,
    error: Result<(), ErrorGuaranteed>,
}

Fields§

§tcx: TyCtxt<'tcx>§param_env: ParamEnv<'tcx>§typeck_results: &'tcx TypeckResults<'tcx>§thir: &'p Thir<'tcx>§lint_level: HirId§let_source: LetSource§pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>§dropless_arena: &'p DroplessArena§error: Result<(), ErrorGuaranteed>

Tracks if we encountered an error while checking this body. That the first function to report it stores it here. Some functions return Result to allow callers to short-circuit on error, but callers don’t need to store it here again.

Implementations§

source§

impl<'p, 'tcx> MatchVisitor<'p, 'tcx>

source

fn with_let_source(&mut self, let_source: LetSource, f: impl FnOnce(&mut Self))

source

fn with_lint_level<T>( &mut self, new_lint_level: LintLevel, f: impl FnOnce(&mut Self) -> T, ) -> T

source

fn visit_land( &mut self, ex: &'p Expr<'tcx>, accumulator: &mut Vec<Option<(Span, RefutableFlag)>>, ) -> Result<(), ErrorGuaranteed>

Visit a nested chain of &&. Used for if-let chains. This must call visit_expr on the subexpressions we are not handling ourselves.

source

fn visit_land_rhs( &mut self, ex: &'p Expr<'tcx>, ) -> Result<Option<(Span, RefutableFlag)>, ErrorGuaranteed>

Visit the right-hand-side of a &&. Used for if-let chains. Returns Some if the expression was ultimately a let ... = ..., and None if it was a normal boolean expression. This must call visit_expr on the subexpressions we are not handling ourselves.

source

fn lower_pattern( &mut self, cx: &PatCtxt<'p, 'tcx>, pat: &'p Pat<'tcx>, ) -> Result<&'p DeconstructedPat<'p, 'tcx>, ErrorGuaranteed>

source

fn is_known_valid_scrutinee(&self, scrutinee: &Expr<'tcx>) -> bool

Inspects the match scrutinee expression to determine whether the place it evaluates to may hold invalid data.

source

fn new_cx( &self, refutability: RefutableFlag, whole_match_span: Option<Span>, scrutinee: Option<&Expr<'tcx>>, scrut_span: Span, ) -> PatCtxt<'p, 'tcx>

source

fn analyze_patterns( &mut self, cx: &PatCtxt<'p, 'tcx>, arms: &[MatchArm<'p, 'tcx>], scrut_ty: Ty<'tcx>, ) -> Result<UsefulnessReport<'p, 'tcx>, ErrorGuaranteed>

source

fn check_let( &mut self, pat: &'p Pat<'tcx>, scrutinee: Option<ExprId>, span: Span, )

source

fn check_match( &mut self, scrut: ExprId, arms: &[ArmId], source: MatchSource, expr_span: Span, )

source

fn check_let_chain( &mut self, chain_refutabilities: Vec<Option<(Span, RefutableFlag)>>, whole_chain_span: Span, )

source

fn analyze_binding( &mut self, pat: &'p Pat<'tcx>, refutability: RefutableFlag, scrut: Option<&Expr<'tcx>>, ) -> Result<(PatCtxt<'p, 'tcx>, UsefulnessReport<'p, 'tcx>), ErrorGuaranteed>

source

fn is_let_irrefutable( &mut self, pat: &'p Pat<'tcx>, scrut: Option<&Expr<'tcx>>, ) -> Result<RefutableFlag, ErrorGuaranteed>

source

fn check_binding_is_irrefutable( &mut self, pat: &'p Pat<'tcx>, origin: &str, scrut: Option<&Expr<'tcx>>, sp: Option<Span>, )

Trait Implementations§

source§

impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx>

source§

fn thir(&self) -> &'p Thir<'tcx>

source§

fn visit_arm(&mut self, arm: &'p Arm<'tcx>)

source§

fn visit_expr(&mut self, ex: &'p Expr<'tcx>)

source§

fn visit_stmt(&mut self, stmt: &'p Stmt<'tcx>)

source§

fn visit_block(&mut self, block: &'thir Block)

source§

fn visit_pat(&mut self, pat: &'thir Pat<'tcx>)

Auto Trait Implementations§

§

impl<'p, 'tcx> Freeze for MatchVisitor<'p, 'tcx>

§

impl<'p, 'tcx> !RefUnwindSafe for MatchVisitor<'p, 'tcx>

§

impl<'p, 'tcx> !Send for MatchVisitor<'p, 'tcx>

§

impl<'p, 'tcx> !Sync for MatchVisitor<'p, 'tcx>

§

impl<'p, 'tcx> Unpin for MatchVisitor<'p, 'tcx>

§

impl<'p, 'tcx> !UnwindSafe for MatchVisitor<'p, 'tcx>

Blanket Implementations§

source§

impl<T> Aligned for T

source§

const ALIGN: Alignment = _

Alignment of Self.
source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

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

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

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

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T, R> CollectAndApply<T, R> for T

source§

fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

source§

type Output = R

source§

impl<T> Filterable for T

source§

fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

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

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> IntoEither for T

source§

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

impl<P> IntoQueryParam<P> for P

source§

impl<T> MaybeResult<T> for T

source§

type Error = !

source§

fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

source§

fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

source§

impl<T> Same for T

source§

type Output = T

Should always be Self
source§

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

source§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

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

source§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

source§

fn upcast(self, interner: I) -> U

source§

impl<I, T> UpcastFrom<I, T> for T

source§

fn upcast_from(from: T, _tcx: I) -> T

source§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

source§

fn vzip(self) -> V

source§

impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

source§

default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

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

source§

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

source§

impl<T> ErasedDestructor for T
where T: 'static,

source§

impl<T> MaybeSendSync for T

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes