struct Liveness<'a, 'tcx> {
    ir: &'a mut IrMaps<'tcx>,
    typeck_results: &'a TypeckResults<'tcx>,
    param_env: ParamEnv<'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>,
}

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§ir: &'a mut IrMaps<'tcx>§typeck_results: &'a TypeckResults<'tcx>§param_env: ParamEnv<'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§

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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fn warn_about_unused_upvars(&self, entry_ln: LiveNode)

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

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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) )

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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<'_>> )

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

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

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

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

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

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

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

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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
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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.
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fn visit_nested_item(&mut self, id: ItemId)

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.
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fn visit_nested_trait_item(&mut self, id: TraitItemId)

Like visit_nested_item(), but for trait items. See visit_nested_item() for advice on when to override this method.
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fn visit_nested_impl_item(&mut self, id: ImplItemId)

Like visit_nested_item(), but for impl items. See visit_nested_item() for advice on when to override this method.
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fn visit_nested_foreign_item(&mut self, id: ForeignItemId)

Like visit_nested_item(), but for foreign items. See visit_nested_item() for advice on when to override this method.
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fn visit_nested_body(&mut self, id: BodyId)

Invoked to visit the body of a function, method or closure. Like visit_nested_item, does nothing by default unless you override Self::NestedFilter.
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fn visit_param(&mut self, param: &'v Param<'v>)

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

Visits the top-level item and (optionally) nested items / impl items. See visit_nested_item for details.
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fn visit_body(&mut self, b: &'v Body<'v>)

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fn visit_id(&mut self, _hir_id: HirId)

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fn visit_name(&mut self, _name: Symbol)

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fn visit_ident(&mut self, ident: Ident)

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

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

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

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

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

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

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fn visit_array_length(&mut self, len: &'v ArrayLen)

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fn visit_anon_const(&mut self, c: &'v AnonConst)

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fn visit_inline_const(&mut self, c: &'v ConstBlock)

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fn visit_let_expr(&mut self, lex: &'v Let<'v>)

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

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

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

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fn visit_const_param_default(&mut self, _param: HirId, ct: &'v AnonConst)

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

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

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

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

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

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

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

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fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef)

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

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fn visit_foreign_item_ref(&mut self, ii: &'v ForeignItemRef)

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fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef)

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

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

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

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

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

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

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

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fn visit_label(&mut self, label: &'v Label)

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fn visit_infer(&mut self, inf: &'v InferArg)

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

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fn visit_lifetime(&mut self, lifetime: &'v Lifetime)

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

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

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

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

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fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding<'v>)

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fn visit_attribute(&mut self, _attr: &'v Attribute)

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fn visit_associated_item_kind(&mut self, kind: &'v AssocItemKind)

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fn visit_defaultness(&mut self, defaultness: &'v Defaultness)

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

Auto Trait Implementations§

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

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

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

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

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

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 224 bytes