Struct rustc_passes::liveness::Liveness

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>,
}

Fields

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

fn warn_about_unused_upvars(&self, entry_ln: LiveNode)

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

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)
)

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<'_>>
)

fn has_added_lit_match_name_span(
    &self,
    name: &str,
    opt_body: Option<&Body<'_>>,
    err: &mut DiagnosticBuilder<'_, ()>
) -> bool

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

fn report_unused_assign(
    &self,
    hir_id: HirId,
    spans: Vec<Span>,
    var: Variable,
    message: impl Fn(&str) -> String
)

Trait Implementations

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

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

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

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

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

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.

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.

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 on itemlikevisit::ItemLikeVisitor. 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.

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.

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.

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.

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.

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

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.

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

fn visit_id(&mut self, _hir_id: HirId)

fn visit_name(&mut self, _name: Symbol)

fn visit_ident(&mut self, ident: Ident)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

fn visit_use(&mut self, path: &'v Path<'v>, hir_id: HirId)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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