Struct rustc_resolve::effective_visibilities::EffectiveVisibilitiesVisitor

pub(crate) struct EffectiveVisibilitiesVisitor<'r, 'a, 'tcx> {
    r: &'r mut Resolver<'a, 'tcx>,
    def_effective_visibilities: EffectiveVisibilities,
    import_effective_visibilities: EffectiveVisibilities<Interned<'a, NameBindingData<'a>>>,
    current_private_vis: Visibility,
    changed: bool,
}

Fields

r: &'r mut Resolver<'a, 'tcx>

def_effective_visibilities: EffectiveVisibilities

import_effective_visibilities: EffectiveVisibilities<Interned<'a, NameBindingData<'a>>>

While walking import chains we need to track effective visibilities per-binding, and def id keys in Resolver::effective_visibilities are not enough for that, because multiple bindings can correspond to a single def id in imports. So we keep a separate table.

current_private_vis: Visibility

changed: bool

Implementations

impl<'r, 'a, 'tcx> EffectiveVisibilitiesVisitor<'r, 'a, 'tcx>

pub(crate) fn compute_effective_visibilities<'c>( r: &'r mut Resolver<'a, 'tcx>, krate: &'c Crate ) -> FxHashSet<Interned<'a, NameBindingData<'a>>>

Fills the Resolver::effective_visibilities table with public & exported items For now, this doesn’t resolve macros (FIXME) and cannot resolve Impl, as we need access to a TyCtxt for that. Returns the set of ambiguous re-exports.

fn set_bindings_effective_visibilities(&mut self, module_id: LocalDefId)

Update effective visibilities of bindings in the given module, including their whole reexport chains.

fn effective_vis_or_private( &mut self, parent_id: ParentId<'a> ) -> EffectiveVisibility

fn may_update( &self, nominal_vis: Visibility, parent_id: ParentId<'_> ) -> Option<Option<Visibility>>

All effective visibilities for a node are larger or equal than private visibility for that node (see check_invariants in middle/privacy.rs). So if either parent or nominal visibility is the same as private visibility, then min(parent_vis, nominal_vis) <= private_vis, and the update logic is guaranteed to not update anything and we can skip it.

We are checking this condition only if the correct value of private visibility is cheaply available, otherwise it doesn’t make sense performance-wise.

None is returned if the update can be skipped, and cheap private visibility is returned otherwise.

fn update_import( &mut self, binding: Interned<'a, NameBindingData<'a>>, parent_id: ParentId<'a> )

fn update_def( &mut self, def_id: LocalDefId, nominal_vis: Visibility, parent_id: ParentId<'a> )

fn update_field(&mut self, def_id: LocalDefId, parent_id: LocalDefId)

Trait Implementations

impl<'r, 'ast, 'tcx> Visitor<'ast> for EffectiveVisibilitiesVisitor<'ast, 'r, 'tcx>

fn visit_item(&mut self, item: &'ast Item)

type Result = ()

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

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

fn visit_foreign_item(&mut self, i: &'ast Item<ForeignItemKind>) -> Self::Result

fn visit_local(&mut self, l: &'ast Local) -> Self::Result

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

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

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

fn visit_arm(&mut self, a: &'ast Arm) -> Self::Result

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

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

fn visit_expr(&mut self, ex: &'ast Expr) -> Self::Result

fn visit_method_receiver_expr(&mut self, ex: &'ast Expr) -> Self::Result

This method is a hack to workaround unstable of stmt_expr_attributes. It can be removed once that feature is stabilized.

fn visit_expr_post(&mut self, _ex: &'ast Expr) -> Self::Result

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

fn visit_generic_param(&mut self, param: &'ast GenericParam) -> Self::Result

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

fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) -> Self::Result

fn visit_where_predicate(&mut self, p: &'ast WherePredicate) -> Self::Result

fn visit_fn(&mut self, fk: FnKind<'ast>, _: Span, _: NodeId) -> Self::Result

fn visit_assoc_item( &mut self, i: &'ast Item<AssocItemKind>, ctxt: AssocCtxt ) -> Self::Result

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

fn visit_param_bound( &mut self, bounds: &'ast GenericBound, _ctxt: BoundKind ) -> Self::Result

fn visit_precise_capturing_arg(&mut self, arg: &'ast PreciseCapturingArg)

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

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

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

fn visit_enum_def(&mut self, enum_definition: &'ast EnumDef) -> Self::Result

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

fn visit_variant_discr(&mut self, discr: &'ast AnonConst) -> Self::Result

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

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

fn visit_mac_call(&mut self, mac: &'ast MacCall) -> Self::Result

fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) -> Self::Result

fn visit_path(&mut self, path: &'ast Path, _id: NodeId) -> Self::Result

fn visit_use_tree( &mut self, use_tree: &'ast UseTree, id: NodeId, _nested: bool ) -> Self::Result

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

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

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

fn visit_assoc_constraint( &mut self, constraint: &'ast AssocConstraint ) -> Self::Result

fn visit_attribute(&mut self, attr: &'ast Attribute) -> Self::Result

fn visit_vis(&mut self, vis: &'ast Visibility) -> Self::Result

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

fn visit_fn_header(&mut self, _header: &'ast FnHeader) -> Self::Result

fn visit_expr_field(&mut self, f: &'ast ExprField) -> Self::Result

fn visit_pat_field(&mut self, fp: &'ast PatField) -> Self::Result

fn visit_crate(&mut self, krate: &'ast Crate) -> Self::Result

fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) -> Self::Result

fn visit_format_args(&mut self, fmt: &'ast FormatArgs) -> Self::Result

fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) -> Self::Result

fn visit_capture_by(&mut self, _capture_by: &'ast CaptureBy) -> Self::Result

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: 128 bytes