rustc_passes::liveness

Struct Liveness

Source
struct Liveness<'a, 'tcx> {
    ir: &'a mut IrMaps<'tcx>,
    typeck_results: &'a TypeckResults<'tcx>,
    typing_env: TypingEnv<'tcx>,
    closure_min_captures: Option<&'tcx RootVariableMinCaptureList<'tcx>>,
    successors: IndexVec<LiveNode, Option<LiveNode>>,
    rwu_table: RWUTable,
    closure_ln: LiveNode,
    exit_ln: LiveNode,
    break_ln: HirIdMap<LiveNode>,
    cont_ln: HirIdMap<LiveNode>,
}

Fields§

§ir: &'a mut IrMaps<'tcx>§typeck_results: &'a TypeckResults<'tcx>§typing_env: TypingEnv<'tcx>§closure_min_captures: Option<&'tcx RootVariableMinCaptureList<'tcx>>§successors: IndexVec<LiveNode, Option<LiveNode>>§rwu_table: RWUTable§closure_ln: LiveNode

A live node representing a point of execution before closure entry & after closure exit. Used to calculate liveness of captured variables through calls to the same closure. Used for Fn & FnMut closures only.

§exit_ln: LiveNode

A live node representing every ‘exit’ from the function, whether it be by explicit return, panic, or other means.

§break_ln: HirIdMap<LiveNode>§cont_ln: HirIdMap<LiveNode>

Implementations§

Source§

impl<'a, 'tcx> Liveness<'a, 'tcx>

Source

fn new(ir: &'a mut IrMaps<'tcx>, body_owner: LocalDefId) -> Liveness<'a, 'tcx>

Source

fn live_node(&self, hir_id: HirId, span: Span) -> LiveNode

Source

fn variable(&self, hir_id: HirId, span: Span) -> Variable

Source

fn define_bindings_in_pat(&mut self, pat: &Pat<'_>, succ: LiveNode) -> LiveNode

Source

fn live_on_entry(&self, ln: LiveNode, var: Variable) -> bool

Source

fn live_on_exit(&self, ln: LiveNode, var: Variable) -> bool

Source

fn used_on_entry(&self, ln: LiveNode, var: Variable) -> bool

Source

fn assigned_on_entry(&self, ln: LiveNode, var: Variable) -> bool

Source

fn assigned_on_exit(&self, ln: LiveNode, var: Variable) -> bool

Source

fn write_vars<F>(&self, wr: &mut dyn Write, test: F) -> Result<()>
where F: FnMut(Variable) -> bool,

Source

fn ln_str(&self, ln: LiveNode) -> String

Source

fn log_liveness(&self, entry_ln: LiveNode, hir_id: HirId)

Source

fn init_empty(&mut self, ln: LiveNode, succ_ln: LiveNode)

Source

fn init_from_succ(&mut self, ln: LiveNode, succ_ln: LiveNode)

Source

fn merge_from_succ(&mut self, ln: LiveNode, succ_ln: LiveNode) -> bool

Source

fn define(&mut self, writer: LiveNode, var: Variable)

Source

fn acc(&mut self, ln: LiveNode, var: Variable, acc: u32)

Source

fn compute(&mut self, body: &Body<'_>, hir_id: HirId) -> LiveNode

Source

fn propagate_through_block( &mut self, blk: &Block<'_>, succ: LiveNode, ) -> LiveNode

Source

fn propagate_through_stmt( &mut self, stmt: &Stmt<'_>, succ: LiveNode, ) -> LiveNode

Source

fn propagate_through_exprs( &mut self, exprs: &[Expr<'_>], succ: LiveNode, ) -> LiveNode

Source

fn propagate_through_opt_expr( &mut self, opt_expr: Option<&Expr<'_>>, succ: LiveNode, ) -> LiveNode

Source

fn propagate_through_expr( &mut self, expr: &Expr<'_>, succ: LiveNode, ) -> LiveNode

Source

fn propagate_through_place_components( &mut self, expr: &Expr<'_>, succ: LiveNode, ) -> LiveNode

Source

fn write_place(&mut self, expr: &Expr<'_>, succ: LiveNode, acc: u32) -> LiveNode

Source

fn access_var( &mut self, hir_id: HirId, var_hid: HirId, succ: LiveNode, acc: u32, span: Span, ) -> LiveNode

Source

fn access_path( &mut self, hir_id: HirId, path: &Path<'_>, succ: LiveNode, acc: u32, ) -> LiveNode

Source

fn propagate_through_loop( &mut self, expr: &Expr<'_>, body: &Block<'_>, succ: LiveNode, ) -> LiveNode

Source

fn check_is_ty_uninhabited( &mut self, expr: &Expr<'_>, succ: LiveNode, ) -> LiveNode

Source

fn warn_about_unreachable<'desc>( &mut self, orig_span: Span, orig_ty: Ty<'tcx>, expr_span: Span, expr_id: HirId, descr: &'desc str, )

Source§

impl<'tcx> Liveness<'_, 'tcx>

Source

fn check_place(&mut self, expr: &'tcx Expr<'tcx>)

Source

fn should_warn(&self, var: Variable) -> Option<String>

Source

fn warn_about_unused_upvars(&self, entry_ln: LiveNode)

Source

fn warn_about_unused_args(&self, body: &Body<'_>, entry_ln: LiveNode)

Source

fn check_unused_vars_in_pat( &self, pat: &Pat<'_>, entry_ln: Option<LiveNode>, opt_body: Option<&Body<'_>>, on_used_on_entry: impl Fn(Vec<Span>, HirId, LiveNode, Variable), )

Source

fn report_unused( &self, hir_ids_and_spans: Vec<(HirId, Span, Span)>, ln: LiveNode, var: Variable, can_remove: bool, pat: &Pat<'_>, opt_body: Option<&Body<'_>>, )

Source

fn string_interp_suggestions( &self, name: &str, opt_body: Option<&Body<'_>>, ) -> Vec<UnusedVariableStringInterp>

Source

fn warn_about_dead_assign( &self, spans: Vec<Span>, hir_id: HirId, ln: LiveNode, var: Variable, )

Trait Implementations§

Source§

impl<'a, 'tcx> Visitor<'tcx> for Liveness<'a, 'tcx>

Source§

fn visit_local(&mut self, local: &'tcx LetStmt<'tcx>)

Source§

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

Source§

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

Source§

type Map = <Self::NestedFilter as NestedFilter<'v>>::Map

Source§

type NestedFilter = None

Override this type to control which nested HIR are visited; see NestedFilter for details. If you override this type, you must also override nested_visit_map. Read more
Source§

type Result = ()

The result type of the visit_* methods. Can be either (), or ControlFlow<T>.
Source§

fn nested_visit_map(&mut self) -> Self::Map

If type NestedFilter is set to visit nested items, this method must also be overridden to provide a map to retrieve nested items.
Source§

fn visit_nested_item(&mut self, id: ItemId) -> Self::Result

Invoked when a nested item is encountered. By default, when Self::NestedFilter is nested_filter::None, this method does nothing. You probably don’t want to override this method – instead, override Self::NestedFilter or use the “shallow” or “deep” visit patterns described at rustc_hir::intravisit. The only reason to override this method is if you want a nested pattern but cannot supply a Map; see nested_visit_map for advice.
Source§

fn visit_nested_trait_item(&mut self, id: TraitItemId) -> Self::Result

Like visit_nested_item(), but for trait items. See visit_nested_item() for advice on when to override this method.
Source§

fn visit_nested_impl_item(&mut self, id: ImplItemId) -> Self::Result

Like visit_nested_item(), but for impl items. See visit_nested_item() for advice on when to override this method.
Source§

fn visit_nested_foreign_item(&mut self, id: ForeignItemId) -> Self::Result

Like visit_nested_item(), but for foreign items. See visit_nested_item() for advice on when to override this method.
Source§

fn visit_nested_body(&mut self, id: BodyId) -> Self::Result

Invoked to visit the body of a function, method or closure. Like visit_nested_item, does nothing by default unless you override Self::NestedFilter.
Source§

fn visit_param(&mut self, param: &'v Param<'v>) -> Self::Result

Source§

fn visit_item(&mut self, i: &'v Item<'v>) -> Self::Result

Visits the top-level item and (optionally) nested items / impl items. See visit_nested_item for details.
Source§

fn visit_body(&mut self, b: &Body<'v>) -> Self::Result

Source§

fn visit_id(&mut self, _hir_id: HirId) -> Self::Result

Source§

fn visit_name(&mut self, _name: Symbol) -> Self::Result

Source§

fn visit_ident(&mut self, ident: Ident) -> Self::Result

Source§

fn visit_mod(&mut self, m: &'v Mod<'v>, _s: Span, n: HirId) -> Self::Result

Source§

fn visit_foreign_item(&mut self, i: &'v ForeignItem<'v>) -> Self::Result

Source§

fn visit_block(&mut self, b: &'v Block<'v>) -> Self::Result

Source§

fn visit_stmt(&mut self, s: &'v Stmt<'v>) -> Self::Result

Source§

fn visit_pat(&mut self, p: &'v Pat<'v>) -> Self::Result

Source§

fn visit_pat_field(&mut self, f: &'v PatField<'v>) -> Self::Result

Source§

fn visit_anon_const(&mut self, c: &'v AnonConst) -> Self::Result

Source§

fn visit_inline_const(&mut self, c: &'v ConstBlock) -> Self::Result

Source§

fn visit_const_arg(&mut self, c: &'v ConstArg<'v>) -> Self::Result

Source§

fn visit_expr_field(&mut self, field: &'v ExprField<'v>) -> Self::Result

Source§

fn visit_ty(&mut self, t: &'v Ty<'v>) -> Self::Result

Source§

fn visit_pattern_type_pattern(&mut self, _p: &'v Pat<'v>)

Source§

fn visit_generic_param(&mut self, p: &'v GenericParam<'v>) -> Self::Result

Source§

fn visit_const_param_default( &mut self, _param: HirId, ct: &'v ConstArg<'v>, ) -> Self::Result

Source§

fn visit_generics(&mut self, g: &'v Generics<'v>) -> Self::Result

Source§

fn visit_where_predicate( &mut self, predicate: &'v WherePredicate<'v>, ) -> Self::Result

Source§

fn visit_fn_ret_ty(&mut self, ret_ty: &'v FnRetTy<'v>) -> Self::Result

Source§

fn visit_fn_decl(&mut self, fd: &'v FnDecl<'v>) -> Self::Result

Source§

fn visit_fn( &mut self, fk: FnKind<'v>, fd: &'v FnDecl<'v>, b: BodyId, _: Span, id: LocalDefId, ) -> Self::Result

Source§

fn visit_use( &mut self, path: &'v Path<'v, SmallVec<[Res; 3]>>, hir_id: HirId, ) -> Self::Result

Source§

fn visit_trait_item(&mut self, ti: &'v TraitItem<'v>) -> Self::Result

Source§

fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef) -> Self::Result

Source§

fn visit_impl_item(&mut self, ii: &'v ImplItem<'v>) -> Self::Result

Source§

fn visit_foreign_item_ref(&mut self, ii: &'v ForeignItemRef) -> Self::Result

Source§

fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef) -> Self::Result

Source§

fn visit_trait_ref(&mut self, t: &'v TraitRef<'v>) -> Self::Result

Source§

fn visit_param_bound(&mut self, bounds: &'v GenericBound<'v>) -> Self::Result

Source§

fn visit_precise_capturing_arg( &mut self, arg: &'v PreciseCapturingArg<'v>, ) -> Self::Result

Source§

fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef<'v>) -> Self::Result

Source§

fn visit_opaque_ty(&mut self, opaque: &'v OpaqueTy<'v>) -> Self::Result

Source§

fn visit_variant_data(&mut self, s: &'v VariantData<'v>) -> Self::Result

Source§

fn visit_field_def(&mut self, s: &'v FieldDef<'v>) -> Self::Result

Source§

fn visit_enum_def( &mut self, enum_definition: &'v EnumDef<'v>, item_id: HirId, ) -> Self::Result

Source§

fn visit_variant(&mut self, v: &'v Variant<'v>) -> Self::Result

Source§

fn visit_label(&mut self, label: &'v Label) -> Self::Result

Source§

fn visit_infer(&mut self, inf: &'v InferArg) -> Self::Result

Source§

fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg<'v>) -> Self::Result

Source§

fn visit_lifetime(&mut self, lifetime: &'v Lifetime) -> Self::Result

Source§

fn visit_qpath( &mut self, qpath: &'v QPath<'v>, id: HirId, _span: Span, ) -> Self::Result

Source§

fn visit_path(&mut self, path: &Path<'v>, _id: HirId) -> Self::Result

Source§

fn visit_path_segment( &mut self, path_segment: &'v PathSegment<'v>, ) -> Self::Result

Source§

fn visit_generic_args( &mut self, generic_args: &'v GenericArgs<'v>, ) -> Self::Result

Source§

fn visit_assoc_item_constraint( &mut self, constraint: &'v AssocItemConstraint<'v>, ) -> Self::Result

Source§

fn visit_attribute(&mut self, _attr: &'v Attribute) -> Self::Result

Source§

fn visit_associated_item_kind( &mut self, kind: &'v AssocItemKind, ) -> Self::Result

Source§

fn visit_defaultness(&mut self, defaultness: &'v Defaultness) -> Self::Result

Source§

fn visit_inline_asm( &mut self, asm: &'v InlineAsm<'v>, id: HirId, ) -> Self::Result

Auto Trait Implementations§

§

impl<'a, 'tcx> !DynSend for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> !DynSync for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> Freeze for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> !RefUnwindSafe for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> !Send for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> !Sync for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> Unpin for Liveness<'a, 'tcx>

§

impl<'a, 'tcx> !UnwindSafe for Liveness<'a, '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> Pointable for T

Source§

const ALIGN: usize = _

The alignment of pointer.
Source§

type Init = T

The type for initializers.
Source§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
Source§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
Source§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
Source§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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<T> ErasedDestructor for T
where T: 'static,

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: 240 bytes