1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
2 #![feature(in_band_lifetimes)]
4 #![feature(control_flow_enum)]
5 #![feature(try_blocks)]
6 #![feature(associated_type_defaults)]
7 #![recursion_limit = "256"]
9 use rustc_ast::MacroDef;
10 use rustc_attr as attr;
11 use rustc_data_structures::fx::FxHashSet;
12 use rustc_errors::struct_span_err;
14 use rustc_hir::def::{DefKind, Res};
15 use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdSet};
16 use rustc_hir::def_id::{CRATE_DEF_ID, CRATE_DEF_INDEX, LOCAL_CRATE};
17 use rustc_hir::intravisit::{self, DeepVisitor, NestedVisitorMap, Visitor};
18 use rustc_hir::{AssocItemKind, HirIdSet, Node, PatKind};
19 use rustc_middle::bug;
20 use rustc_middle::hir::map::Map;
21 use rustc_middle::middle::privacy::{AccessLevel, AccessLevels};
22 use rustc_middle::span_bug;
23 use rustc_middle::thir::abstract_const::Node as ACNode;
24 use rustc_middle::ty::fold::TypeVisitor;
25 use rustc_middle::ty::query::Providers;
26 use rustc_middle::ty::subst::InternalSubsts;
27 use rustc_middle::ty::{self, Const, GenericParamDefKind, TraitRef, Ty, TyCtxt, TypeFoldable};
28 use rustc_session::lint;
29 use rustc_span::hygiene::Transparency;
30 use rustc_span::symbol::{kw, sym, Ident};
32 use rustc_trait_selection::traits::const_evaluatable::{self, AbstractConst};
34 use std::marker::PhantomData;
35 use std::ops::ControlFlow;
36 use std::{cmp, fmt, mem};
38 ////////////////////////////////////////////////////////////////////////////////
39 /// Generic infrastructure used to implement specific visitors below.
40 ////////////////////////////////////////////////////////////////////////////////
42 /// Implemented to visit all `DefId`s in a type.
43 /// Visiting `DefId`s is useful because visibilities and reachabilities are attached to them.
44 /// The idea is to visit "all components of a type", as documented in
45 /// <https://github.com/rust-lang/rfcs/blob/master/text/2145-type-privacy.md#how-to-determine-visibility-of-a-type>.
46 /// The default type visitor (`TypeVisitor`) does most of the job, but it has some shortcomings.
47 /// First, it doesn't have overridable `fn visit_trait_ref`, so we have to catch trait `DefId`s
48 /// manually. Second, it doesn't visit some type components like signatures of fn types, or traits
49 /// in `impl Trait`, see individual comments in `DefIdVisitorSkeleton::visit_ty`.
50 trait DefIdVisitor<'tcx> {
53 fn tcx(&self) -> TyCtxt<'tcx>;
54 fn shallow(&self) -> bool {
57 fn skip_assoc_tys(&self) -> bool {
64 descr: &dyn fmt::Display,
65 ) -> ControlFlow<Self::BreakTy>;
67 /// Not overridden, but used to actually visit types and traits.
68 fn skeleton(&mut self) -> DefIdVisitorSkeleton<'_, 'tcx, Self> {
69 DefIdVisitorSkeleton {
71 visited_opaque_tys: Default::default(),
72 dummy: Default::default(),
75 fn visit(&mut self, ty_fragment: impl TypeFoldable<'tcx>) -> ControlFlow<Self::BreakTy> {
76 ty_fragment.visit_with(&mut self.skeleton())
78 fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> ControlFlow<Self::BreakTy> {
79 self.skeleton().visit_trait(trait_ref)
81 fn visit_projection_ty(
83 projection: ty::ProjectionTy<'tcx>,
84 ) -> ControlFlow<Self::BreakTy> {
85 self.skeleton().visit_projection_ty(projection)
89 predicates: ty::GenericPredicates<'tcx>,
90 ) -> ControlFlow<Self::BreakTy> {
91 self.skeleton().visit_predicates(predicates)
95 struct DefIdVisitorSkeleton<'v, 'tcx, V: ?Sized> {
96 def_id_visitor: &'v mut V,
97 visited_opaque_tys: FxHashSet<DefId>,
98 dummy: PhantomData<TyCtxt<'tcx>>,
101 impl<'tcx, V> DefIdVisitorSkeleton<'_, 'tcx, V>
103 V: DefIdVisitor<'tcx> + ?Sized,
105 fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> ControlFlow<V::BreakTy> {
106 let TraitRef { def_id, substs } = trait_ref;
107 self.def_id_visitor.visit_def_id(def_id, "trait", &trait_ref.print_only_trait_path())?;
108 if self.def_id_visitor.shallow() { ControlFlow::CONTINUE } else { substs.visit_with(self) }
111 fn visit_projection_ty(
113 projection: ty::ProjectionTy<'tcx>,
114 ) -> ControlFlow<V::BreakTy> {
115 let (trait_ref, assoc_substs) =
116 projection.trait_ref_and_own_substs(self.def_id_visitor.tcx());
117 self.visit_trait(trait_ref)?;
118 if self.def_id_visitor.shallow() {
119 ControlFlow::CONTINUE
121 assoc_substs.iter().try_for_each(|subst| subst.visit_with(self))
125 fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<V::BreakTy> {
126 match predicate.kind().skip_binder() {
127 ty::PredicateKind::Trait(ty::TraitPredicate {
131 }) => self.visit_trait(trait_ref),
132 ty::PredicateKind::Projection(ty::ProjectionPredicate { projection_ty, ty }) => {
133 ty.visit_with(self)?;
134 self.visit_projection_ty(projection_ty)
136 ty::PredicateKind::TypeOutlives(ty::OutlivesPredicate(ty, _region)) => {
139 ty::PredicateKind::RegionOutlives(..) => ControlFlow::CONTINUE,
140 ty::PredicateKind::ConstEvaluatable(uv)
141 if self.def_id_visitor.tcx().features().generic_const_exprs =>
143 let tcx = self.def_id_visitor.tcx();
144 if let Ok(Some(ct)) = AbstractConst::new(tcx, uv) {
145 self.visit_abstract_const_expr(tcx, ct)?;
147 ControlFlow::CONTINUE
149 _ => bug!("unexpected predicate: {:?}", predicate),
153 fn visit_abstract_const_expr(
156 ct: AbstractConst<'tcx>,
157 ) -> ControlFlow<V::BreakTy> {
158 const_evaluatable::walk_abstract_const(tcx, ct, |node| match node.root(tcx) {
159 ACNode::Leaf(leaf) => self.visit_const(leaf),
160 ACNode::Cast(_, _, ty) => self.visit_ty(ty),
161 ACNode::Binop(..) | ACNode::UnaryOp(..) | ACNode::FunctionCall(_, _) => {
162 ControlFlow::CONTINUE
169 predicates: ty::GenericPredicates<'tcx>,
170 ) -> ControlFlow<V::BreakTy> {
171 let ty::GenericPredicates { parent: _, predicates } = predicates;
172 predicates.iter().try_for_each(|&(predicate, _span)| self.visit_predicate(predicate))
176 impl<'tcx, V> TypeVisitor<'tcx> for DefIdVisitorSkeleton<'_, 'tcx, V>
178 V: DefIdVisitor<'tcx> + ?Sized,
180 type BreakTy = V::BreakTy;
182 fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
183 Some(self.def_id_visitor.tcx())
186 fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<V::BreakTy> {
187 let tcx = self.def_id_visitor.tcx();
188 // InternalSubsts are not visited here because they are visited below in `super_visit_with`.
190 ty::Adt(&ty::AdtDef { did: def_id, .. }, ..)
191 | ty::Foreign(def_id)
192 | ty::FnDef(def_id, ..)
193 | ty::Closure(def_id, ..)
194 | ty::Generator(def_id, ..) => {
195 self.def_id_visitor.visit_def_id(def_id, "type", &ty)?;
196 if self.def_id_visitor.shallow() {
197 return ControlFlow::CONTINUE;
199 // Default type visitor doesn't visit signatures of fn types.
200 // Something like `fn() -> Priv {my_func}` is considered a private type even if
201 // `my_func` is public, so we need to visit signatures.
202 if let ty::FnDef(..) = ty.kind() {
203 tcx.fn_sig(def_id).visit_with(self)?;
205 // Inherent static methods don't have self type in substs.
206 // Something like `fn() {my_method}` type of the method
207 // `impl Pub<Priv> { pub fn my_method() {} }` is considered a private type,
208 // so we need to visit the self type additionally.
209 if let Some(assoc_item) = tcx.opt_associated_item(def_id) {
210 if let ty::ImplContainer(impl_def_id) = assoc_item.container {
211 tcx.type_of(impl_def_id).visit_with(self)?;
215 ty::Projection(proj) => {
216 if self.def_id_visitor.skip_assoc_tys() {
217 // Visitors searching for minimal visibility/reachability want to
218 // conservatively approximate associated types like `<Type as Trait>::Alias`
219 // as visible/reachable even if both `Type` and `Trait` are private.
220 // Ideally, associated types should be substituted in the same way as
221 // free type aliases, but this isn't done yet.
222 return ControlFlow::CONTINUE;
224 // This will also visit substs if necessary, so we don't need to recurse.
225 return self.visit_projection_ty(proj);
227 ty::Dynamic(predicates, ..) => {
228 // All traits in the list are considered the "primary" part of the type
229 // and are visited by shallow visitors.
230 for predicate in predicates {
231 let trait_ref = match predicate.skip_binder() {
232 ty::ExistentialPredicate::Trait(trait_ref) => trait_ref,
233 ty::ExistentialPredicate::Projection(proj) => proj.trait_ref(tcx),
234 ty::ExistentialPredicate::AutoTrait(def_id) => {
235 ty::ExistentialTraitRef { def_id, substs: InternalSubsts::empty() }
238 let ty::ExistentialTraitRef { def_id, substs: _ } = trait_ref;
239 self.def_id_visitor.visit_def_id(def_id, "trait", &trait_ref)?;
242 ty::Opaque(def_id, ..) => {
243 // Skip repeated `Opaque`s to avoid infinite recursion.
244 if self.visited_opaque_tys.insert(def_id) {
245 // The intent is to treat `impl Trait1 + Trait2` identically to
246 // `dyn Trait1 + Trait2`. Therefore we ignore def-id of the opaque type itself
247 // (it either has no visibility, or its visibility is insignificant, like
248 // visibilities of type aliases) and recurse into bounds instead to go
249 // through the trait list (default type visitor doesn't visit those traits).
250 // All traits in the list are considered the "primary" part of the type
251 // and are visited by shallow visitors.
252 self.visit_predicates(ty::GenericPredicates {
254 predicates: tcx.explicit_item_bounds(def_id),
258 // These types don't have their own def-ids (but may have subcomponents
259 // with def-ids that should be visited recursively).
275 | ty::GeneratorWitness(..) => {}
276 ty::Bound(..) | ty::Placeholder(..) | ty::Infer(..) => {
277 bug!("unexpected type: {:?}", ty)
281 if self.def_id_visitor.shallow() {
282 ControlFlow::CONTINUE
284 ty.super_visit_with(self)
288 fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<Self::BreakTy> {
289 self.visit_ty(c.ty)?;
290 let tcx = self.def_id_visitor.tcx();
291 if let Ok(Some(ct)) = AbstractConst::from_const(tcx, c) {
292 self.visit_abstract_const_expr(tcx, ct)?;
294 ControlFlow::CONTINUE
298 fn min(vis1: ty::Visibility, vis2: ty::Visibility, tcx: TyCtxt<'_>) -> ty::Visibility {
299 if vis1.is_at_least(vis2, tcx) { vis2 } else { vis1 }
302 ////////////////////////////////////////////////////////////////////////////////
303 /// Visitor used to determine if pub(restricted) is used anywhere in the crate.
305 /// This is done so that `private_in_public` warnings can be turned into hard errors
306 /// in crates that have been updated to use pub(restricted).
307 ////////////////////////////////////////////////////////////////////////////////
308 struct PubRestrictedVisitor<'tcx> {
310 has_pub_restricted: bool,
313 impl Visitor<'tcx> for PubRestrictedVisitor<'tcx> {
314 type Map = Map<'tcx>;
316 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
317 NestedVisitorMap::All(self.tcx.hir())
319 fn visit_vis(&mut self, vis: &'tcx hir::Visibility<'tcx>) {
320 self.has_pub_restricted = self.has_pub_restricted || vis.node.is_pub_restricted();
324 ////////////////////////////////////////////////////////////////////////////////
325 /// Visitor used to determine impl visibility and reachability.
326 ////////////////////////////////////////////////////////////////////////////////
328 struct FindMin<'a, 'tcx, VL: VisibilityLike> {
330 access_levels: &'a AccessLevels,
334 impl<'a, 'tcx, VL: VisibilityLike> DefIdVisitor<'tcx> for FindMin<'a, 'tcx, VL> {
335 fn tcx(&self) -> TyCtxt<'tcx> {
338 fn shallow(&self) -> bool {
341 fn skip_assoc_tys(&self) -> bool {
348 _descr: &dyn fmt::Display,
349 ) -> ControlFlow<Self::BreakTy> {
350 self.min = VL::new_min(self, def_id);
351 ControlFlow::CONTINUE
355 trait VisibilityLike: Sized {
357 const SHALLOW: bool = false;
358 fn new_min(find: &FindMin<'_, '_, Self>, def_id: DefId) -> Self;
360 // Returns an over-approximation (`skip_assoc_tys` = true) of visibility due to
361 // associated types for which we can't determine visibility precisely.
362 fn of_impl(def_id: LocalDefId, tcx: TyCtxt<'_>, access_levels: &AccessLevels) -> Self {
363 let mut find = FindMin { tcx, access_levels, min: Self::MAX };
364 find.visit(tcx.type_of(def_id));
365 if let Some(trait_ref) = tcx.impl_trait_ref(def_id) {
366 find.visit_trait(trait_ref);
371 impl VisibilityLike for ty::Visibility {
372 const MAX: Self = ty::Visibility::Public;
373 fn new_min(find: &FindMin<'_, '_, Self>, def_id: DefId) -> Self {
374 min(find.tcx.visibility(def_id), find.min, find.tcx)
377 impl VisibilityLike for Option<AccessLevel> {
378 const MAX: Self = Some(AccessLevel::Public);
379 // Type inference is very smart sometimes.
380 // It can make an impl reachable even some components of its type or trait are unreachable.
381 // E.g. methods of `impl ReachableTrait<UnreachableTy> for ReachableTy<UnreachableTy> { ... }`
382 // can be usable from other crates (#57264). So we skip substs when calculating reachability
383 // and consider an impl reachable if its "shallow" type and trait are reachable.
385 // The assumption we make here is that type-inference won't let you use an impl without knowing
386 // both "shallow" version of its self type and "shallow" version of its trait if it exists
387 // (which require reaching the `DefId`s in them).
388 const SHALLOW: bool = true;
389 fn new_min(find: &FindMin<'_, '_, Self>, def_id: DefId) -> Self {
391 if let Some(def_id) = def_id.as_local() {
392 find.access_levels.map.get(&def_id).copied()
401 ////////////////////////////////////////////////////////////////////////////////
402 /// The embargo visitor, used to determine the exports of the AST.
403 ////////////////////////////////////////////////////////////////////////////////
405 struct EmbargoVisitor<'tcx> {
408 /// Accessibility levels for reachable nodes.
409 access_levels: AccessLevels,
410 /// A set of pairs corresponding to modules, where the first module is
411 /// reachable via a macro that's defined in the second module. This cannot
412 /// be represented as reachable because it can't handle the following case:
414 /// pub mod n { // Should be `Public`
415 /// pub(crate) mod p { // Should *not* be accessible
416 /// pub fn f() -> i32 { 12 } // Must be `Reachable`
422 macro_reachable: FxHashSet<(LocalDefId, LocalDefId)>,
423 /// Previous accessibility level; `None` means unreachable.
424 prev_level: Option<AccessLevel>,
425 /// Has something changed in the level map?
429 struct ReachEverythingInTheInterfaceVisitor<'a, 'tcx> {
430 access_level: Option<AccessLevel>,
431 item_def_id: LocalDefId,
432 ev: &'a mut EmbargoVisitor<'tcx>,
435 impl EmbargoVisitor<'tcx> {
436 fn get(&self, def_id: LocalDefId) -> Option<AccessLevel> {
437 self.access_levels.map.get(&def_id).copied()
440 /// Updates node level and returns the updated level.
441 fn update(&mut self, def_id: LocalDefId, level: Option<AccessLevel>) -> Option<AccessLevel> {
442 let old_level = self.get(def_id);
443 // Accessibility levels can only grow.
444 if level > old_level {
445 self.access_levels.map.insert(def_id, level.unwrap());
456 access_level: Option<AccessLevel>,
457 ) -> ReachEverythingInTheInterfaceVisitor<'_, 'tcx> {
458 ReachEverythingInTheInterfaceVisitor {
459 access_level: cmp::min(access_level, Some(AccessLevel::Reachable)),
465 // We have to make sure that the items that macros might reference
466 // are reachable, since they might be exported transitively.
467 fn update_reachability_from_macro(&mut self, local_def_id: LocalDefId, md: &MacroDef) {
468 // Non-opaque macros cannot make other items more accessible than they already are.
470 let hir_id = self.tcx.hir().local_def_id_to_hir_id(local_def_id);
471 let attrs = self.tcx.hir().attrs(hir_id);
472 if attr::find_transparency(attrs, md.macro_rules).0 != Transparency::Opaque {
476 let item_def_id = local_def_id.to_def_id();
477 let macro_module_def_id =
478 ty::DefIdTree::parent(self.tcx, item_def_id).unwrap().expect_local();
479 if self.tcx.hir().opt_def_kind(macro_module_def_id) != Some(DefKind::Mod) {
480 // The macro's parent doesn't correspond to a `mod`, return early (#63164, #65252).
484 if self.get(local_def_id).is_none() {
488 // Since we are starting from an externally visible module,
489 // all the parents in the loop below are also guaranteed to be modules.
490 let mut module_def_id = macro_module_def_id;
492 let changed_reachability =
493 self.update_macro_reachable(module_def_id, macro_module_def_id);
494 if changed_reachability || module_def_id == CRATE_DEF_ID {
498 ty::DefIdTree::parent(self.tcx, module_def_id.to_def_id()).unwrap().expect_local();
502 /// Updates the item as being reachable through a macro defined in the given
503 /// module. Returns `true` if the level has changed.
504 fn update_macro_reachable(
506 module_def_id: LocalDefId,
507 defining_mod: LocalDefId,
509 if self.macro_reachable.insert((module_def_id, defining_mod)) {
510 self.update_macro_reachable_mod(module_def_id, defining_mod);
517 fn update_macro_reachable_mod(&mut self, module_def_id: LocalDefId, defining_mod: LocalDefId) {
518 let module = self.tcx.hir().get_module(module_def_id).0;
519 for item_id in module.item_ids {
520 let def_kind = self.tcx.def_kind(item_id.def_id);
521 let vis = self.tcx.visibility(item_id.def_id);
522 self.update_macro_reachable_def(item_id.def_id, def_kind, vis, defining_mod);
524 if let Some(exports) = self.tcx.module_exports(module_def_id) {
525 for export in exports {
526 if export.vis.is_accessible_from(defining_mod.to_def_id(), self.tcx) {
527 if let Res::Def(def_kind, def_id) = export.res {
528 if let Some(def_id) = def_id.as_local() {
529 let vis = self.tcx.visibility(def_id.to_def_id());
530 self.update_macro_reachable_def(def_id, def_kind, vis, defining_mod);
538 fn update_macro_reachable_def(
545 let level = Some(AccessLevel::Reachable);
546 if let ty::Visibility::Public = vis {
547 self.update(def_id, level);
550 // No type privacy, so can be directly marked as reachable.
551 DefKind::Const | DefKind::Static | DefKind::TraitAlias | DefKind::TyAlias => {
552 if vis.is_accessible_from(module.to_def_id(), self.tcx) {
553 self.update(def_id, level);
557 // Hygine isn't really implemented for `macro_rules!` macros at the
558 // moment. Accordingly, marking them as reachable is unwise. `macro` macros
559 // have normal hygine, so we can treat them like other items without type
560 // privacy and mark them reachable.
561 DefKind::Macro(_) => {
562 let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
563 let item = self.tcx.hir().expect_item(hir_id);
564 if let hir::ItemKind::Macro(MacroDef { macro_rules: false, .. }) = item.kind {
565 if vis.is_accessible_from(module.to_def_id(), self.tcx) {
566 self.update(def_id, level);
571 // We can't use a module name as the final segment of a path, except
572 // in use statements. Since re-export checking doesn't consider
573 // hygiene these don't need to be marked reachable. The contents of
574 // the module, however may be reachable.
576 if vis.is_accessible_from(module.to_def_id(), self.tcx) {
577 self.update_macro_reachable(def_id, module);
581 DefKind::Struct | DefKind::Union => {
582 // While structs and unions have type privacy, their fields do not.
583 if let ty::Visibility::Public = vis {
585 self.tcx.hir().expect_item(self.tcx.hir().local_def_id_to_hir_id(def_id));
586 if let hir::ItemKind::Struct(ref struct_def, _)
587 | hir::ItemKind::Union(ref struct_def, _) = item.kind
589 for field in struct_def.fields() {
590 let def_id = self.tcx.hir().local_def_id(field.hir_id);
591 let field_vis = self.tcx.visibility(def_id);
592 if field_vis.is_accessible_from(module.to_def_id(), self.tcx) {
593 self.reach(def_id, level).ty();
597 bug!("item {:?} with DefKind {:?}", item, def_kind);
602 // These have type privacy, so are not reachable unless they're
603 // public, or are not namespaced at all.
606 | DefKind::ConstParam
607 | DefKind::Ctor(_, _)
616 | DefKind::LifetimeParam
617 | DefKind::ExternCrate
619 | DefKind::ForeignMod
625 | DefKind::Generator => (),
629 /// Given the path segments of an `ItemKind::Use`, then we need
630 /// to update the visibility of the intermediate use so that it isn't linted
631 /// by `unreachable_pub`.
633 /// This isn't trivial as `path.res` has the `DefId` of the eventual target
634 /// of the use statement not of the next intermediate use statement.
636 /// To do this, consider the last two segments of the path to our intermediate
637 /// use statement. We expect the penultimate segment to be a module and the
638 /// last segment to be the name of the item we are exporting. We can then
639 /// look at the items contained in the module for the use statement with that
640 /// name and update that item's visibility.
642 /// FIXME: This solution won't work with glob imports and doesn't respect
643 /// namespaces. See <https://github.com/rust-lang/rust/pull/57922#discussion_r251234202>.
644 fn update_visibility_of_intermediate_use_statements(
646 segments: &[hir::PathSegment<'_>],
648 if let [.., module, segment] = segments {
649 if let Some(item) = module
651 .and_then(|res| res.mod_def_id())
652 // If the module is `self`, i.e. the current crate,
653 // there will be no corresponding item.
654 .filter(|def_id| def_id.index != CRATE_DEF_INDEX || def_id.krate != LOCAL_CRATE)
656 def_id.as_local().map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id))
658 .map(|module_hir_id| self.tcx.hir().expect_item(module_hir_id))
660 if let hir::ItemKind::Mod(m) = &item.kind {
661 for &item_id in m.item_ids {
662 let item = self.tcx.hir().item(item_id);
663 if !self.tcx.hygienic_eq(
666 item_id.def_id.to_def_id(),
670 if let hir::ItemKind::Use(..) = item.kind {
671 self.update(item.def_id, Some(AccessLevel::Exported));
680 impl Visitor<'tcx> for EmbargoVisitor<'tcx> {
681 type Map = Map<'tcx>;
683 /// We want to visit items in the context of their containing
684 /// module and so forth, so supply a crate for doing a deep walk.
685 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
686 NestedVisitorMap::All(self.tcx.hir())
689 fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
690 let inherited_item_level = match item.kind {
691 hir::ItemKind::Impl { .. } => {
692 Option::<AccessLevel>::of_impl(item.def_id, self.tcx, &self.access_levels)
694 // Only exported `macro_rules!` items are public, but they always are.
695 hir::ItemKind::Macro(MacroDef { macro_rules: true, .. }) => {
696 let def_id = item.def_id.to_def_id();
697 let is_macro_export = self.tcx.has_attr(def_id, sym::macro_export);
698 if is_macro_export { Some(AccessLevel::Public) } else { None }
700 // Foreign modules inherit level from parents.
701 hir::ItemKind::ForeignMod { .. } => self.prev_level,
702 // Other `pub` items inherit levels from parents.
703 hir::ItemKind::Const(..)
704 | hir::ItemKind::Enum(..)
705 | hir::ItemKind::ExternCrate(..)
706 | hir::ItemKind::GlobalAsm(..)
707 | hir::ItemKind::Fn(..)
708 | hir::ItemKind::Macro(..)
709 | hir::ItemKind::Mod(..)
710 | hir::ItemKind::Static(..)
711 | hir::ItemKind::Struct(..)
712 | hir::ItemKind::Trait(..)
713 | hir::ItemKind::TraitAlias(..)
714 | hir::ItemKind::OpaqueTy(..)
715 | hir::ItemKind::TyAlias(..)
716 | hir::ItemKind::Union(..)
717 | hir::ItemKind::Use(..) => {
718 if item.vis.node.is_pub() {
726 // Update level of the item itself.
727 let item_level = self.update(item.def_id, inherited_item_level);
729 // Update levels of nested things.
731 hir::ItemKind::Enum(ref def, _) => {
732 for variant in def.variants {
734 self.update(self.tcx.hir().local_def_id(variant.id), item_level);
735 if let Some(ctor_hir_id) = variant.data.ctor_hir_id() {
736 self.update(self.tcx.hir().local_def_id(ctor_hir_id), item_level);
738 for field in variant.data.fields() {
739 self.update(self.tcx.hir().local_def_id(field.hir_id), variant_level);
743 hir::ItemKind::Impl(ref impl_) => {
744 for impl_item_ref in impl_.items {
745 if impl_.of_trait.is_some()
746 || self.tcx.visibility(impl_item_ref.id.def_id) == ty::Visibility::Public
748 self.update(impl_item_ref.id.def_id, item_level);
752 hir::ItemKind::Trait(.., trait_item_refs) => {
753 for trait_item_ref in trait_item_refs {
754 self.update(trait_item_ref.id.def_id, item_level);
757 hir::ItemKind::Struct(ref def, _) | hir::ItemKind::Union(ref def, _) => {
758 if let Some(ctor_hir_id) = def.ctor_hir_id() {
759 self.update(self.tcx.hir().local_def_id(ctor_hir_id), item_level);
761 for field in def.fields() {
762 if field.vis.node.is_pub() {
763 self.update(self.tcx.hir().local_def_id(field.hir_id), item_level);
767 hir::ItemKind::Macro(ref macro_def) => {
768 self.update_reachability_from_macro(item.def_id, macro_def);
770 hir::ItemKind::ForeignMod { items, .. } => {
771 for foreign_item in items {
772 if self.tcx.visibility(foreign_item.id.def_id) == ty::Visibility::Public {
773 self.update(foreign_item.id.def_id, item_level);
778 hir::ItemKind::OpaqueTy(..)
779 | hir::ItemKind::Use(..)
780 | hir::ItemKind::Static(..)
781 | hir::ItemKind::Const(..)
782 | hir::ItemKind::GlobalAsm(..)
783 | hir::ItemKind::TyAlias(..)
784 | hir::ItemKind::Mod(..)
785 | hir::ItemKind::TraitAlias(..)
786 | hir::ItemKind::Fn(..)
787 | hir::ItemKind::ExternCrate(..) => {}
790 // Mark all items in interfaces of reachable items as reachable.
792 // The interface is empty.
793 hir::ItemKind::Macro(..) | hir::ItemKind::ExternCrate(..) => {}
794 // All nested items are checked by `visit_item`.
795 hir::ItemKind::Mod(..) => {}
796 // Re-exports are handled in `visit_mod`. However, in order to avoid looping over
797 // all of the items of a mod in `visit_mod` looking for use statements, we handle
798 // making sure that intermediate use statements have their visibilities updated here.
799 hir::ItemKind::Use(path, _) => {
800 if item_level.is_some() {
801 self.update_visibility_of_intermediate_use_statements(path.segments.as_ref());
804 // The interface is empty.
805 hir::ItemKind::GlobalAsm(..) => {}
806 hir::ItemKind::OpaqueTy(..) => {
807 // HACK(jynelson): trying to infer the type of `impl trait` breaks `async-std` (and `pub async fn` in general)
808 // Since rustdoc never needs to do codegen and doesn't care about link-time reachability,
809 // mark this as unreachable.
810 // See https://github.com/rust-lang/rust/issues/75100
811 if !self.tcx.sess.opts.actually_rustdoc {
812 // FIXME: This is some serious pessimization intended to workaround deficiencies
813 // in the reachability pass (`middle/reachable.rs`). Types are marked as link-time
814 // reachable if they are returned via `impl Trait`, even from private functions.
816 cmp::max(item_level, Some(AccessLevel::ReachableFromImplTrait));
817 self.reach(item.def_id, exist_level).generics().predicates().ty();
821 hir::ItemKind::Const(..)
822 | hir::ItemKind::Static(..)
823 | hir::ItemKind::Fn(..)
824 | hir::ItemKind::TyAlias(..) => {
825 if item_level.is_some() {
826 self.reach(item.def_id, item_level).generics().predicates().ty();
829 hir::ItemKind::Trait(.., trait_item_refs) => {
830 if item_level.is_some() {
831 self.reach(item.def_id, item_level).generics().predicates();
833 for trait_item_ref in trait_item_refs {
834 let mut reach = self.reach(trait_item_ref.id.def_id, item_level);
835 reach.generics().predicates();
837 if trait_item_ref.kind == AssocItemKind::Type
838 && !trait_item_ref.defaultness.has_value()
847 hir::ItemKind::TraitAlias(..) => {
848 if item_level.is_some() {
849 self.reach(item.def_id, item_level).generics().predicates();
852 // Visit everything except for private impl items.
853 hir::ItemKind::Impl(ref impl_) => {
854 if item_level.is_some() {
855 self.reach(item.def_id, item_level).generics().predicates().ty().trait_ref();
857 for impl_item_ref in impl_.items {
858 let impl_item_level = self.get(impl_item_ref.id.def_id);
859 if impl_item_level.is_some() {
860 self.reach(impl_item_ref.id.def_id, impl_item_level)
869 // Visit everything, but enum variants have their own levels.
870 hir::ItemKind::Enum(ref def, _) => {
871 if item_level.is_some() {
872 self.reach(item.def_id, item_level).generics().predicates();
874 for variant in def.variants {
875 let variant_level = self.get(self.tcx.hir().local_def_id(variant.id));
876 if variant_level.is_some() {
877 for field in variant.data.fields() {
878 self.reach(self.tcx.hir().local_def_id(field.hir_id), variant_level)
881 // Corner case: if the variant is reachable, but its
882 // enum is not, make the enum reachable as well.
883 self.update(item.def_id, variant_level);
887 // Visit everything, but foreign items have their own levels.
888 hir::ItemKind::ForeignMod { items, .. } => {
889 for foreign_item in items {
890 let foreign_item_level = self.get(foreign_item.id.def_id);
891 if foreign_item_level.is_some() {
892 self.reach(foreign_item.id.def_id, foreign_item_level)
899 // Visit everything except for private fields.
900 hir::ItemKind::Struct(ref struct_def, _) | hir::ItemKind::Union(ref struct_def, _) => {
901 if item_level.is_some() {
902 self.reach(item.def_id, item_level).generics().predicates();
903 for field in struct_def.fields() {
904 let def_id = self.tcx.hir().local_def_id(field.hir_id);
905 let field_level = self.get(def_id);
906 if field_level.is_some() {
907 self.reach(def_id, field_level).ty();
914 let orig_level = mem::replace(&mut self.prev_level, item_level);
915 intravisit::walk_item(self, item);
916 self.prev_level = orig_level;
919 fn visit_block(&mut self, b: &'tcx hir::Block<'tcx>) {
920 // Blocks can have public items, for example impls, but they always
921 // start as completely private regardless of publicity of a function,
922 // constant, type, field, etc., in which this block resides.
923 let orig_level = mem::replace(&mut self.prev_level, None);
924 intravisit::walk_block(self, b);
925 self.prev_level = orig_level;
928 fn visit_mod(&mut self, m: &'tcx hir::Mod<'tcx>, _sp: Span, id: hir::HirId) {
929 // This code is here instead of in visit_item so that the
930 // crate module gets processed as well.
931 if self.prev_level.is_some() {
932 let def_id = self.tcx.hir().local_def_id(id);
933 if let Some(exports) = self.tcx.module_exports(def_id) {
934 for export in exports.iter() {
935 if export.vis == ty::Visibility::Public {
936 if let Some(def_id) = export.res.opt_def_id() {
937 if let Some(def_id) = def_id.as_local() {
938 self.update(def_id, Some(AccessLevel::Exported));
946 intravisit::walk_mod(self, m, id);
950 impl ReachEverythingInTheInterfaceVisitor<'_, 'tcx> {
951 fn generics(&mut self) -> &mut Self {
952 for param in &self.ev.tcx.generics_of(self.item_def_id).params {
954 GenericParamDefKind::Lifetime => {}
955 GenericParamDefKind::Type { has_default, .. } => {
957 self.visit(self.ev.tcx.type_of(param.def_id));
960 GenericParamDefKind::Const { has_default, .. } => {
961 self.visit(self.ev.tcx.type_of(param.def_id));
963 self.visit(self.ev.tcx.const_param_default(param.def_id));
971 fn predicates(&mut self) -> &mut Self {
972 self.visit_predicates(self.ev.tcx.predicates_of(self.item_def_id));
976 fn ty(&mut self) -> &mut Self {
977 self.visit(self.ev.tcx.type_of(self.item_def_id));
981 fn trait_ref(&mut self) -> &mut Self {
982 if let Some(trait_ref) = self.ev.tcx.impl_trait_ref(self.item_def_id) {
983 self.visit_trait(trait_ref);
989 impl DefIdVisitor<'tcx> for ReachEverythingInTheInterfaceVisitor<'_, 'tcx> {
990 fn tcx(&self) -> TyCtxt<'tcx> {
997 _descr: &dyn fmt::Display,
998 ) -> ControlFlow<Self::BreakTy> {
999 if let Some(def_id) = def_id.as_local() {
1000 if let (ty::Visibility::Public, _) | (_, Some(AccessLevel::ReachableFromImplTrait)) =
1001 (self.tcx().visibility(def_id.to_def_id()), self.access_level)
1003 self.ev.update(def_id, self.access_level);
1006 ControlFlow::CONTINUE
1010 //////////////////////////////////////////////////////////////////////////////////////
1011 /// Name privacy visitor, checks privacy and reports violations.
1012 /// Most of name privacy checks are performed during the main resolution phase,
1013 /// or later in type checking when field accesses and associated items are resolved.
1014 /// This pass performs remaining checks for fields in struct expressions and patterns.
1015 //////////////////////////////////////////////////////////////////////////////////////
1017 struct NamePrivacyVisitor<'tcx> {
1019 maybe_typeck_results: Option<&'tcx ty::TypeckResults<'tcx>>,
1020 current_item: LocalDefId,
1023 impl<'tcx> NamePrivacyVisitor<'tcx> {
1024 /// Gets the type-checking results for the current body.
1025 /// As this will ICE if called outside bodies, only call when working with
1026 /// `Expr` or `Pat` nodes (they are guaranteed to be found only in bodies).
1028 fn typeck_results(&self) -> &'tcx ty::TypeckResults<'tcx> {
1029 self.maybe_typeck_results
1030 .expect("`NamePrivacyVisitor::typeck_results` called outside of body")
1033 // Checks that a field in a struct constructor (expression or pattern) is accessible.
1036 use_ctxt: Span, // syntax context of the field name at the use site
1037 span: Span, // span of the field pattern, e.g., `x: 0`
1038 def: &'tcx ty::AdtDef, // definition of the struct or enum
1039 field: &'tcx ty::FieldDef,
1040 in_update_syntax: bool,
1046 // definition of the field
1047 let ident = Ident::new(kw::Empty, use_ctxt);
1048 let hir_id = self.tcx.hir().local_def_id_to_hir_id(self.current_item);
1049 let def_id = self.tcx.adjust_ident_and_get_scope(ident, def.did, hir_id).1;
1050 if !field.vis.is_accessible_from(def_id, self.tcx) {
1051 let label = if in_update_syntax {
1052 format!("field `{}` is private", field.ident)
1054 "private field".to_string()
1061 "field `{}` of {} `{}` is private",
1063 def.variant_descr(),
1064 self.tcx.def_path_str(def.did)
1066 .span_label(span, label)
1072 impl<'tcx> Visitor<'tcx> for NamePrivacyVisitor<'tcx> {
1073 type Map = Map<'tcx>;
1075 /// We want to visit items in the context of their containing
1076 /// module and so forth, so supply a crate for doing a deep walk.
1077 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
1078 NestedVisitorMap::All(self.tcx.hir())
1081 fn visit_mod(&mut self, _m: &'tcx hir::Mod<'tcx>, _s: Span, _n: hir::HirId) {
1082 // Don't visit nested modules, since we run a separate visitor walk
1083 // for each module in `privacy_access_levels`
1086 fn visit_nested_body(&mut self, body: hir::BodyId) {
1087 let old_maybe_typeck_results =
1088 self.maybe_typeck_results.replace(self.tcx.typeck_body(body));
1089 let body = self.tcx.hir().body(body);
1090 self.visit_body(body);
1091 self.maybe_typeck_results = old_maybe_typeck_results;
1094 fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1095 let orig_current_item = mem::replace(&mut self.current_item, item.def_id);
1096 intravisit::walk_item(self, item);
1097 self.current_item = orig_current_item;
1100 fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
1101 if let hir::ExprKind::Struct(qpath, fields, ref base) = expr.kind {
1102 let res = self.typeck_results().qpath_res(qpath, expr.hir_id);
1103 let adt = self.typeck_results().expr_ty(expr).ty_adt_def().unwrap();
1104 let variant = adt.variant_of_res(res);
1105 if let Some(base) = *base {
1106 // If the expression uses FRU we need to make sure all the unmentioned fields
1107 // are checked for privacy (RFC 736). Rather than computing the set of
1108 // unmentioned fields, just check them all.
1109 for (vf_index, variant_field) in variant.fields.iter().enumerate() {
1110 let field = fields.iter().find(|f| {
1111 self.tcx.field_index(f.hir_id, self.typeck_results()) == vf_index
1113 let (use_ctxt, span) = match field {
1114 Some(field) => (field.ident.span, field.span),
1115 None => (base.span, base.span),
1117 self.check_field(use_ctxt, span, adt, variant_field, true);
1120 for field in fields {
1121 let use_ctxt = field.ident.span;
1122 let index = self.tcx.field_index(field.hir_id, self.typeck_results());
1123 self.check_field(use_ctxt, field.span, adt, &variant.fields[index], false);
1128 intravisit::walk_expr(self, expr);
1131 fn visit_pat(&mut self, pat: &'tcx hir::Pat<'tcx>) {
1132 if let PatKind::Struct(ref qpath, fields, _) = pat.kind {
1133 let res = self.typeck_results().qpath_res(qpath, pat.hir_id);
1134 let adt = self.typeck_results().pat_ty(pat).ty_adt_def().unwrap();
1135 let variant = adt.variant_of_res(res);
1136 for field in fields {
1137 let use_ctxt = field.ident.span;
1138 let index = self.tcx.field_index(field.hir_id, self.typeck_results());
1139 self.check_field(use_ctxt, field.span, adt, &variant.fields[index], false);
1143 intravisit::walk_pat(self, pat);
1147 ////////////////////////////////////////////////////////////////////////////////////////////
1148 /// Type privacy visitor, checks types for privacy and reports violations.
1149 /// Both explicitly written types and inferred types of expressions and patterns are checked.
1150 /// Checks are performed on "semantic" types regardless of names and their hygiene.
1151 ////////////////////////////////////////////////////////////////////////////////////////////
1153 struct TypePrivacyVisitor<'tcx> {
1155 maybe_typeck_results: Option<&'tcx ty::TypeckResults<'tcx>>,
1156 current_item: LocalDefId,
1160 impl<'tcx> TypePrivacyVisitor<'tcx> {
1161 /// Gets the type-checking results for the current body.
1162 /// As this will ICE if called outside bodies, only call when working with
1163 /// `Expr` or `Pat` nodes (they are guaranteed to be found only in bodies).
1165 fn typeck_results(&self) -> &'tcx ty::TypeckResults<'tcx> {
1166 self.maybe_typeck_results
1167 .expect("`TypePrivacyVisitor::typeck_results` called outside of body")
1170 fn item_is_accessible(&self, did: DefId) -> bool {
1171 self.tcx.visibility(did).is_accessible_from(self.current_item.to_def_id(), self.tcx)
1174 // Take node-id of an expression or pattern and check its type for privacy.
1175 fn check_expr_pat_type(&mut self, id: hir::HirId, span: Span) -> bool {
1177 let typeck_results = self.typeck_results();
1178 let result: ControlFlow<()> = try {
1179 self.visit(typeck_results.node_type(id))?;
1180 self.visit(typeck_results.node_substs(id))?;
1181 if let Some(adjustments) = typeck_results.adjustments().get(id) {
1182 adjustments.iter().try_for_each(|adjustment| self.visit(adjustment.target))?;
1188 fn check_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {
1189 let is_error = !self.item_is_accessible(def_id);
1193 .struct_span_err(self.span, &format!("{} `{}` is private", kind, descr))
1194 .span_label(self.span, &format!("private {}", kind))
1201 impl<'tcx> Visitor<'tcx> for TypePrivacyVisitor<'tcx> {
1202 type Map = Map<'tcx>;
1204 /// We want to visit items in the context of their containing
1205 /// module and so forth, so supply a crate for doing a deep walk.
1206 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
1207 NestedVisitorMap::All(self.tcx.hir())
1210 fn visit_mod(&mut self, _m: &'tcx hir::Mod<'tcx>, _s: Span, _n: hir::HirId) {
1211 // Don't visit nested modules, since we run a separate visitor walk
1212 // for each module in `privacy_access_levels`
1215 fn visit_nested_body(&mut self, body: hir::BodyId) {
1216 let old_maybe_typeck_results =
1217 self.maybe_typeck_results.replace(self.tcx.typeck_body(body));
1218 let body = self.tcx.hir().body(body);
1219 self.visit_body(body);
1220 self.maybe_typeck_results = old_maybe_typeck_results;
1223 fn visit_generic_arg(&mut self, generic_arg: &'tcx hir::GenericArg<'tcx>) {
1225 hir::GenericArg::Type(t) => self.visit_ty(t),
1226 hir::GenericArg::Infer(inf) => self.visit_infer(inf),
1227 hir::GenericArg::Lifetime(_) | hir::GenericArg::Const(_) => {}
1231 fn visit_ty(&mut self, hir_ty: &'tcx hir::Ty<'tcx>) {
1232 self.span = hir_ty.span;
1233 if let Some(typeck_results) = self.maybe_typeck_results {
1235 if self.visit(typeck_results.node_type(hir_ty.hir_id)).is_break() {
1239 // Types in signatures.
1240 // FIXME: This is very ineffective. Ideally each HIR type should be converted
1241 // into a semantic type only once and the result should be cached somehow.
1242 if self.visit(rustc_typeck::hir_ty_to_ty(self.tcx, hir_ty)).is_break() {
1247 intravisit::walk_ty(self, hir_ty);
1250 fn visit_infer(&mut self, inf: &'tcx hir::InferArg) {
1251 self.span = inf.span;
1252 if let Some(typeck_results) = self.maybe_typeck_results {
1253 if let Some(ty) = typeck_results.node_type_opt(inf.hir_id) {
1254 if self.visit(ty).is_break() {
1259 let local_id = self.tcx.hir().local_def_id(inf.hir_id);
1260 if let Some(did) = self.tcx.opt_const_param_of(local_id) {
1261 if self.visit_def_id(did, "inferred", &"").is_break() {
1266 // FIXME see above note for same issue.
1267 if self.visit(rustc_typeck::hir_ty_to_ty(self.tcx, &inf.to_ty())).is_break() {
1271 intravisit::walk_inf(self, inf);
1274 fn visit_trait_ref(&mut self, trait_ref: &'tcx hir::TraitRef<'tcx>) {
1275 self.span = trait_ref.path.span;
1276 if self.maybe_typeck_results.is_none() {
1277 // Avoid calling `hir_trait_to_predicates` in bodies, it will ICE.
1278 // The traits' privacy in bodies is already checked as a part of trait object types.
1279 let bounds = rustc_typeck::hir_trait_to_predicates(
1282 // NOTE: This isn't really right, but the actual type doesn't matter here. It's
1283 // just required by `ty::TraitRef`.
1284 self.tcx.types.never,
1287 for (trait_predicate, _, _) in bounds.trait_bounds {
1288 if self.visit_trait(trait_predicate.skip_binder()).is_break() {
1293 for (poly_predicate, _) in bounds.projection_bounds {
1294 if self.visit(poly_predicate.skip_binder().ty).is_break()
1296 .visit_projection_ty(poly_predicate.skip_binder().projection_ty)
1304 intravisit::walk_trait_ref(self, trait_ref);
1307 // Check types of expressions
1308 fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
1309 if self.check_expr_pat_type(expr.hir_id, expr.span) {
1310 // Do not check nested expressions if the error already happened.
1314 hir::ExprKind::Assign(_, rhs, _) | hir::ExprKind::Match(rhs, ..) => {
1315 // Do not report duplicate errors for `x = y` and `match x { ... }`.
1316 if self.check_expr_pat_type(rhs.hir_id, rhs.span) {
1320 hir::ExprKind::MethodCall(_, span, _, _) => {
1321 // Method calls have to be checked specially.
1323 if let Some(def_id) = self.typeck_results().type_dependent_def_id(expr.hir_id) {
1324 if self.visit(self.tcx.type_of(def_id)).is_break() {
1330 .delay_span_bug(expr.span, "no type-dependent def for method call");
1336 intravisit::walk_expr(self, expr);
1339 // Prohibit access to associated items with insufficient nominal visibility.
1341 // Additionally, until better reachability analysis for macros 2.0 is available,
1342 // we prohibit access to private statics from other crates, this allows to give
1343 // more code internal visibility at link time. (Access to private functions
1344 // is already prohibited by type privacy for function types.)
1345 fn visit_qpath(&mut self, qpath: &'tcx hir::QPath<'tcx>, id: hir::HirId, span: Span) {
1346 let def = match qpath {
1347 hir::QPath::Resolved(_, path) => match path.res {
1348 Res::Def(kind, def_id) => Some((kind, def_id)),
1351 hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => self
1352 .maybe_typeck_results
1353 .and_then(|typeck_results| typeck_results.type_dependent_def(id)),
1355 let def = def.filter(|(kind, _)| {
1358 DefKind::AssocFn | DefKind::AssocConst | DefKind::AssocTy | DefKind::Static
1361 if let Some((kind, def_id)) = def {
1362 let is_local_static =
1363 if let DefKind::Static = kind { def_id.is_local() } else { false };
1364 if !self.item_is_accessible(def_id) && !is_local_static {
1365 let sess = self.tcx.sess;
1366 let sm = sess.source_map();
1367 let name = match qpath {
1368 hir::QPath::Resolved(..) | hir::QPath::LangItem(..) => {
1369 sm.span_to_snippet(qpath.span()).ok()
1371 hir::QPath::TypeRelative(_, segment) => Some(segment.ident.to_string()),
1373 let kind = kind.descr(def_id);
1374 let msg = match name {
1375 Some(name) => format!("{} `{}` is private", kind, name),
1376 None => format!("{} is private", kind),
1378 sess.struct_span_err(span, &msg)
1379 .span_label(span, &format!("private {}", kind))
1385 intravisit::walk_qpath(self, qpath, id, span);
1388 // Check types of patterns.
1389 fn visit_pat(&mut self, pattern: &'tcx hir::Pat<'tcx>) {
1390 if self.check_expr_pat_type(pattern.hir_id, pattern.span) {
1391 // Do not check nested patterns if the error already happened.
1395 intravisit::walk_pat(self, pattern);
1398 fn visit_local(&mut self, local: &'tcx hir::Local<'tcx>) {
1399 if let Some(init) = local.init {
1400 if self.check_expr_pat_type(init.hir_id, init.span) {
1401 // Do not report duplicate errors for `let x = y`.
1406 intravisit::walk_local(self, local);
1409 // Check types in item interfaces.
1410 fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1411 let orig_current_item = mem::replace(&mut self.current_item, item.def_id);
1412 let old_maybe_typeck_results = self.maybe_typeck_results.take();
1413 intravisit::walk_item(self, item);
1414 self.maybe_typeck_results = old_maybe_typeck_results;
1415 self.current_item = orig_current_item;
1419 impl DefIdVisitor<'tcx> for TypePrivacyVisitor<'tcx> {
1420 fn tcx(&self) -> TyCtxt<'tcx> {
1427 descr: &dyn fmt::Display,
1428 ) -> ControlFlow<Self::BreakTy> {
1429 if self.check_def_id(def_id, kind, descr) {
1432 ControlFlow::CONTINUE
1437 ///////////////////////////////////////////////////////////////////////////////
1438 /// Obsolete visitors for checking for private items in public interfaces.
1439 /// These visitors are supposed to be kept in frozen state and produce an
1440 /// "old error node set". For backward compatibility the new visitor reports
1441 /// warnings instead of hard errors when the erroneous node is not in this old set.
1442 ///////////////////////////////////////////////////////////////////////////////
1444 struct ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
1446 access_levels: &'a AccessLevels,
1448 // Set of errors produced by this obsolete visitor.
1449 old_error_set: HirIdSet,
1452 struct ObsoleteCheckTypeForPrivatenessVisitor<'a, 'b, 'tcx> {
1453 inner: &'a ObsoleteVisiblePrivateTypesVisitor<'b, 'tcx>,
1454 /// Whether the type refers to private types.
1455 contains_private: bool,
1456 /// Whether we've recurred at all (i.e., if we're pointing at the
1457 /// first type on which `visit_ty` was called).
1458 at_outer_type: bool,
1459 /// Whether that first type is a public path.
1460 outer_type_is_public_path: bool,
1463 impl<'a, 'tcx> ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
1464 fn path_is_private_type(&self, path: &hir::Path<'_>) -> bool {
1465 let did = match path.res {
1466 Res::PrimTy(..) | Res::SelfTy(..) | Res::Err => return false,
1467 res => res.def_id(),
1470 // A path can only be private if:
1471 // it's in this crate...
1472 if let Some(did) = did.as_local() {
1473 // .. and it corresponds to a private type in the AST (this returns
1474 // `None` for type parameters).
1475 match self.tcx.hir().find(self.tcx.hir().local_def_id_to_hir_id(did)) {
1476 Some(Node::Item(item)) => !item.vis.node.is_pub(),
1477 Some(_) | None => false,
1484 fn trait_is_public(&self, trait_id: LocalDefId) -> bool {
1485 // FIXME: this would preferably be using `exported_items`, but all
1486 // traits are exported currently (see `EmbargoVisitor.exported_trait`).
1487 self.access_levels.is_public(trait_id)
1490 fn check_generic_bound(&mut self, bound: &hir::GenericBound<'_>) {
1491 if let hir::GenericBound::Trait(ref trait_ref, _) = *bound {
1492 if self.path_is_private_type(trait_ref.trait_ref.path) {
1493 self.old_error_set.insert(trait_ref.trait_ref.hir_ref_id);
1498 fn item_is_public(&self, def_id: LocalDefId, vis: &hir::Visibility<'_>) -> bool {
1499 self.access_levels.is_reachable(def_id) || vis.node.is_pub()
1503 impl<'a, 'b, 'tcx, 'v> Visitor<'v> for ObsoleteCheckTypeForPrivatenessVisitor<'a, 'b, 'tcx> {
1504 type Map = intravisit::ErasedMap<'v>;
1506 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
1507 NestedVisitorMap::None
1510 fn visit_generic_arg(&mut self, generic_arg: &'v hir::GenericArg<'v>) {
1512 hir::GenericArg::Type(t) => self.visit_ty(t),
1513 hir::GenericArg::Infer(inf) => self.visit_ty(&inf.to_ty()),
1514 hir::GenericArg::Lifetime(_) | hir::GenericArg::Const(_) => {}
1518 fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
1519 if let hir::TyKind::Path(hir::QPath::Resolved(_, path)) = ty.kind {
1520 if self.inner.path_is_private_type(path) {
1521 self.contains_private = true;
1522 // Found what we're looking for, so let's stop working.
1526 if let hir::TyKind::Path(_) = ty.kind {
1527 if self.at_outer_type {
1528 self.outer_type_is_public_path = true;
1531 self.at_outer_type = false;
1532 intravisit::walk_ty(self, ty)
1535 // Don't want to recurse into `[, .. expr]`.
1536 fn visit_expr(&mut self, _: &hir::Expr<'_>) {}
1539 impl<'a, 'tcx> Visitor<'tcx> for ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
1540 type Map = Map<'tcx>;
1542 /// We want to visit items in the context of their containing
1543 /// module and so forth, so supply a crate for doing a deep walk.
1544 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
1545 NestedVisitorMap::All(self.tcx.hir())
1548 fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1550 // Contents of a private mod can be re-exported, so we need
1551 // to check internals.
1552 hir::ItemKind::Mod(_) => {}
1554 // An `extern {}` doesn't introduce a new privacy
1555 // namespace (the contents have their own privacies).
1556 hir::ItemKind::ForeignMod { .. } => {}
1558 hir::ItemKind::Trait(.., bounds, _) => {
1559 if !self.trait_is_public(item.def_id) {
1563 for bound in bounds.iter() {
1564 self.check_generic_bound(bound)
1568 // Impls need some special handling to try to offer useful
1569 // error messages without (too many) false positives
1570 // (i.e., we could just return here to not check them at
1571 // all, or some worse estimation of whether an impl is
1572 // publicly visible).
1573 hir::ItemKind::Impl(ref impl_) => {
1574 // `impl [... for] Private` is never visible.
1575 let self_contains_private;
1576 // `impl [... for] Public<...>`, but not `impl [... for]
1577 // Vec<Public>` or `(Public,)`, etc.
1578 let self_is_public_path;
1580 // Check the properties of the `Self` type:
1582 let mut visitor = ObsoleteCheckTypeForPrivatenessVisitor {
1584 contains_private: false,
1585 at_outer_type: true,
1586 outer_type_is_public_path: false,
1588 visitor.visit_ty(impl_.self_ty);
1589 self_contains_private = visitor.contains_private;
1590 self_is_public_path = visitor.outer_type_is_public_path;
1593 // Miscellaneous info about the impl:
1595 // `true` iff this is `impl Private for ...`.
1596 let not_private_trait = impl_.of_trait.as_ref().map_or(
1597 true, // no trait counts as public trait
1599 if let Some(def_id) = tr.path.res.def_id().as_local() {
1600 self.trait_is_public(def_id)
1602 true // external traits must be public
1607 // `true` iff this is a trait impl or at least one method is public.
1609 // `impl Public { $( fn ...() {} )* }` is not visible.
1611 // This is required over just using the methods' privacy
1612 // directly because we might have `impl<T: Foo<Private>> ...`,
1613 // and we shouldn't warn about the generics if all the methods
1614 // are private (because `T` won't be visible externally).
1615 let trait_or_some_public_method = impl_.of_trait.is_some()
1616 || impl_.items.iter().any(|impl_item_ref| {
1617 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1618 match impl_item.kind {
1619 hir::ImplItemKind::Const(..) | hir::ImplItemKind::Fn(..) => {
1620 self.access_levels.is_reachable(impl_item_ref.id.def_id)
1622 hir::ImplItemKind::TyAlias(_) => false,
1626 if !self_contains_private && not_private_trait && trait_or_some_public_method {
1627 intravisit::walk_generics(self, &impl_.generics);
1629 match impl_.of_trait {
1631 for impl_item_ref in impl_.items {
1632 // This is where we choose whether to walk down
1633 // further into the impl to check its items. We
1634 // should only walk into public items so that we
1635 // don't erroneously report errors for private
1636 // types in private items.
1637 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1638 match impl_item.kind {
1639 hir::ImplItemKind::Const(..) | hir::ImplItemKind::Fn(..)
1641 .item_is_public(impl_item.def_id, &impl_item.vis) =>
1643 intravisit::walk_impl_item(self, impl_item)
1645 hir::ImplItemKind::TyAlias(..) => {
1646 intravisit::walk_impl_item(self, impl_item)
1653 // Any private types in a trait impl fall into three
1655 // 1. mentioned in the trait definition
1656 // 2. mentioned in the type params/generics
1657 // 3. mentioned in the associated types of the impl
1659 // Those in 1. can only occur if the trait is in
1660 // this crate and will've been warned about on the
1661 // trait definition (there's no need to warn twice
1662 // so we don't check the methods).
1664 // Those in 2. are warned via walk_generics and this
1666 intravisit::walk_path(self, tr.path);
1668 // Those in 3. are warned with this call.
1669 for impl_item_ref in impl_.items {
1670 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1671 if let hir::ImplItemKind::TyAlias(ty) = impl_item.kind {
1677 } else if impl_.of_trait.is_none() && self_is_public_path {
1678 // `impl Public<Private> { ... }`. Any public static
1679 // methods will be visible as `Public::foo`.
1680 let mut found_pub_static = false;
1681 for impl_item_ref in impl_.items {
1682 if self.access_levels.is_reachable(impl_item_ref.id.def_id)
1683 || self.tcx.visibility(impl_item_ref.id.def_id)
1684 == ty::Visibility::Public
1686 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1687 match impl_item_ref.kind {
1688 AssocItemKind::Const => {
1689 found_pub_static = true;
1690 intravisit::walk_impl_item(self, impl_item);
1692 AssocItemKind::Fn { has_self: false } => {
1693 found_pub_static = true;
1694 intravisit::walk_impl_item(self, impl_item);
1700 if found_pub_static {
1701 intravisit::walk_generics(self, &impl_.generics)
1707 // `type ... = ...;` can contain private types, because
1708 // we're introducing a new name.
1709 hir::ItemKind::TyAlias(..) => return,
1711 // Not at all public, so we don't care.
1712 _ if !self.item_is_public(item.def_id, &item.vis) => {
1719 // We've carefully constructed it so that if we're here, then
1720 // any `visit_ty`'s will be called on things that are in
1721 // public signatures, i.e., things that we're interested in for
1723 intravisit::walk_item(self, item);
1726 fn visit_generics(&mut self, generics: &'tcx hir::Generics<'tcx>) {
1727 for param in generics.params {
1728 for bound in param.bounds {
1729 self.check_generic_bound(bound);
1732 for predicate in generics.where_clause.predicates {
1734 hir::WherePredicate::BoundPredicate(bound_pred) => {
1735 for bound in bound_pred.bounds.iter() {
1736 self.check_generic_bound(bound)
1739 hir::WherePredicate::RegionPredicate(_) => {}
1740 hir::WherePredicate::EqPredicate(eq_pred) => {
1741 self.visit_ty(eq_pred.rhs_ty);
1747 fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
1748 if self.access_levels.is_reachable(item.def_id) {
1749 intravisit::walk_foreign_item(self, item)
1753 fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx>) {
1754 if let hir::TyKind::Path(hir::QPath::Resolved(_, path)) = t.kind {
1755 if self.path_is_private_type(path) {
1756 self.old_error_set.insert(t.hir_id);
1759 intravisit::walk_ty(self, t)
1764 v: &'tcx hir::Variant<'tcx>,
1765 g: &'tcx hir::Generics<'tcx>,
1766 item_id: hir::HirId,
1768 if self.access_levels.is_reachable(self.tcx.hir().local_def_id(v.id)) {
1769 self.in_variant = true;
1770 intravisit::walk_variant(self, v, g, item_id);
1771 self.in_variant = false;
1775 fn visit_field_def(&mut self, s: &'tcx hir::FieldDef<'tcx>) {
1776 if s.vis.node.is_pub() || self.in_variant {
1777 intravisit::walk_field_def(self, s);
1781 // We don't need to introspect into these at all: an
1782 // expression/block context can't possibly contain exported things.
1783 // (Making them no-ops stops us from traversing the whole AST without
1784 // having to be super careful about our `walk_...` calls above.)
1785 fn visit_block(&mut self, _: &'tcx hir::Block<'tcx>) {}
1786 fn visit_expr(&mut self, _: &'tcx hir::Expr<'tcx>) {}
1789 ///////////////////////////////////////////////////////////////////////////////
1790 /// SearchInterfaceForPrivateItemsVisitor traverses an item's interface and
1791 /// finds any private components in it.
1792 /// PrivateItemsInPublicInterfacesVisitor ensures there are no private types
1793 /// and traits in public interfaces.
1794 ///////////////////////////////////////////////////////////////////////////////
1796 struct SearchInterfaceForPrivateItemsVisitor<'tcx> {
1798 item_def_id: LocalDefId,
1799 /// The visitor checks that each component type is at least this visible.
1800 required_visibility: ty::Visibility,
1801 has_pub_restricted: bool,
1802 has_old_errors: bool,
1806 impl SearchInterfaceForPrivateItemsVisitor<'tcx> {
1807 fn generics(&mut self) -> &mut Self {
1808 for param in &self.tcx.generics_of(self.item_def_id).params {
1810 GenericParamDefKind::Lifetime => {}
1811 GenericParamDefKind::Type { has_default, .. } => {
1813 self.visit(self.tcx.type_of(param.def_id));
1816 // FIXME(generic_const_exprs): May want to look inside const here
1817 GenericParamDefKind::Const { .. } => {
1818 self.visit(self.tcx.type_of(param.def_id));
1825 fn predicates(&mut self) -> &mut Self {
1826 // N.B., we use `explicit_predicates_of` and not `predicates_of`
1827 // because we don't want to report privacy errors due to where
1828 // clauses that the compiler inferred. We only want to
1829 // consider the ones that the user wrote. This is important
1830 // for the inferred outlives rules; see
1831 // `src/test/ui/rfc-2093-infer-outlives/privacy.rs`.
1832 self.visit_predicates(self.tcx.explicit_predicates_of(self.item_def_id));
1836 fn bounds(&mut self) -> &mut Self {
1837 self.visit_predicates(ty::GenericPredicates {
1839 predicates: self.tcx.explicit_item_bounds(self.item_def_id),
1844 fn ty(&mut self) -> &mut Self {
1845 self.visit(self.tcx.type_of(self.item_def_id));
1849 fn check_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {
1850 if self.leaks_private_dep(def_id) {
1851 self.tcx.struct_span_lint_hir(
1852 lint::builtin::EXPORTED_PRIVATE_DEPENDENCIES,
1853 self.tcx.hir().local_def_id_to_hir_id(self.item_def_id),
1854 self.tcx.def_span(self.item_def_id.to_def_id()),
1856 lint.build(&format!(
1857 "{} `{}` from private dependency '{}' in public \
1861 self.tcx.crate_name(def_id.krate)
1868 let hir_id = match def_id.as_local() {
1869 Some(def_id) => self.tcx.hir().local_def_id_to_hir_id(def_id),
1870 None => return false,
1873 let vis = self.tcx.visibility(def_id);
1874 if !vis.is_at_least(self.required_visibility, self.tcx) {
1875 let vis_descr = match vis {
1876 ty::Visibility::Public => "public",
1877 ty::Visibility::Invisible => "private",
1878 ty::Visibility::Restricted(vis_def_id) => {
1879 if vis_def_id == self.tcx.parent_module(hir_id).to_def_id() {
1881 } else if vis_def_id.is_top_level_module() {
1888 let make_msg = || format!("{} {} `{}` in public interface", vis_descr, kind, descr);
1889 let span = self.tcx.def_span(self.item_def_id.to_def_id());
1890 if self.has_pub_restricted || self.has_old_errors || self.in_assoc_ty {
1891 let mut err = if kind == "trait" {
1892 struct_span_err!(self.tcx.sess, span, E0445, "{}", make_msg())
1894 struct_span_err!(self.tcx.sess, span, E0446, "{}", make_msg())
1897 self.tcx.sess.source_map().guess_head_span(self.tcx.def_span(def_id));
1898 err.span_label(span, format!("can't leak {} {}", vis_descr, kind));
1899 err.span_label(vis_span, format!("`{}` declared as {}", descr, vis_descr));
1902 let err_code = if kind == "trait" { "E0445" } else { "E0446" };
1903 self.tcx.struct_span_lint_hir(
1904 lint::builtin::PRIVATE_IN_PUBLIC,
1907 |lint| lint.build(&format!("{} (error {})", make_msg(), err_code)).emit(),
1915 /// An item is 'leaked' from a private dependency if all
1916 /// of the following are true:
1917 /// 1. It's contained within a public type
1918 /// 2. It comes from a private crate
1919 fn leaks_private_dep(&self, item_id: DefId) -> bool {
1920 let ret = self.required_visibility == ty::Visibility::Public
1921 && self.tcx.is_private_dep(item_id.krate);
1923 tracing::debug!("leaks_private_dep(item_id={:?})={}", item_id, ret);
1928 impl DefIdVisitor<'tcx> for SearchInterfaceForPrivateItemsVisitor<'tcx> {
1929 fn tcx(&self) -> TyCtxt<'tcx> {
1936 descr: &dyn fmt::Display,
1937 ) -> ControlFlow<Self::BreakTy> {
1938 if self.check_def_id(def_id, kind, descr) {
1941 ControlFlow::CONTINUE
1946 struct PrivateItemsInPublicInterfacesVisitor<'tcx> {
1948 has_pub_restricted: bool,
1949 old_error_set_ancestry: LocalDefIdSet,
1952 impl<'tcx> PrivateItemsInPublicInterfacesVisitor<'tcx> {
1956 required_visibility: ty::Visibility,
1957 ) -> SearchInterfaceForPrivateItemsVisitor<'tcx> {
1958 SearchInterfaceForPrivateItemsVisitor {
1960 item_def_id: def_id,
1961 required_visibility,
1962 has_pub_restricted: self.has_pub_restricted,
1963 has_old_errors: self.old_error_set_ancestry.contains(&def_id),
1968 fn check_assoc_item(
1971 assoc_item_kind: AssocItemKind,
1972 defaultness: hir::Defaultness,
1973 vis: ty::Visibility,
1975 let mut check = self.check(def_id, vis);
1977 let (check_ty, is_assoc_ty) = match assoc_item_kind {
1978 AssocItemKind::Const | AssocItemKind::Fn { .. } => (true, false),
1979 AssocItemKind::Type => (defaultness.has_value(), true),
1981 check.in_assoc_ty = is_assoc_ty;
1982 check.generics().predicates();
1989 impl<'tcx> Visitor<'tcx> for PrivateItemsInPublicInterfacesVisitor<'tcx> {
1990 type Map = Map<'tcx>;
1992 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
1993 NestedVisitorMap::OnlyBodies(self.tcx.hir())
1996 fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1998 let item_visibility = tcx.visibility(item.def_id);
2001 // Crates are always public.
2002 hir::ItemKind::ExternCrate(..) => {}
2003 // All nested items are checked by `visit_item`.
2004 hir::ItemKind::Mod(..) => {}
2005 // Checked in resolve.
2006 hir::ItemKind::Use(..) => {}
2008 hir::ItemKind::Macro(..) | hir::ItemKind::GlobalAsm(..) => {}
2009 // Subitems of these items have inherited publicity.
2010 hir::ItemKind::Const(..)
2011 | hir::ItemKind::Static(..)
2012 | hir::ItemKind::Fn(..)
2013 | hir::ItemKind::TyAlias(..) => {
2014 self.check(item.def_id, item_visibility).generics().predicates().ty();
2016 hir::ItemKind::OpaqueTy(..) => {
2017 // `ty()` for opaque types is the underlying type,
2018 // it's not a part of interface, so we skip it.
2019 self.check(item.def_id, item_visibility).generics().bounds();
2021 hir::ItemKind::Trait(.., trait_item_refs) => {
2022 self.check(item.def_id, item_visibility).generics().predicates();
2024 for trait_item_ref in trait_item_refs {
2025 self.check_assoc_item(
2026 trait_item_ref.id.def_id,
2027 trait_item_ref.kind,
2028 trait_item_ref.defaultness,
2032 if let AssocItemKind::Type = trait_item_ref.kind {
2033 self.check(trait_item_ref.id.def_id, item_visibility).bounds();
2037 hir::ItemKind::TraitAlias(..) => {
2038 self.check(item.def_id, item_visibility).generics().predicates();
2040 hir::ItemKind::Enum(ref def, _) => {
2041 self.check(item.def_id, item_visibility).generics().predicates();
2043 for variant in def.variants {
2044 for field in variant.data.fields() {
2045 self.check(self.tcx.hir().local_def_id(field.hir_id), item_visibility).ty();
2049 // Subitems of foreign modules have their own publicity.
2050 hir::ItemKind::ForeignMod { items, .. } => {
2051 for foreign_item in items {
2052 let vis = tcx.visibility(foreign_item.id.def_id);
2053 self.check(foreign_item.id.def_id, vis).generics().predicates().ty();
2056 // Subitems of structs and unions have their own publicity.
2057 hir::ItemKind::Struct(ref struct_def, _) | hir::ItemKind::Union(ref struct_def, _) => {
2058 self.check(item.def_id, item_visibility).generics().predicates();
2060 for field in struct_def.fields() {
2061 let def_id = tcx.hir().local_def_id(field.hir_id);
2062 let field_visibility = tcx.visibility(def_id);
2063 self.check(def_id, min(item_visibility, field_visibility, tcx)).ty();
2066 // An inherent impl is public when its type is public
2067 // Subitems of inherent impls have their own publicity.
2068 // A trait impl is public when both its type and its trait are public
2069 // Subitems of trait impls have inherited publicity.
2070 hir::ItemKind::Impl(ref impl_) => {
2071 let impl_vis = ty::Visibility::of_impl(item.def_id, tcx, &Default::default());
2072 self.check(item.def_id, impl_vis).generics().predicates();
2073 for impl_item_ref in impl_.items {
2074 let impl_item_vis = if impl_.of_trait.is_none() {
2075 min(tcx.visibility(impl_item_ref.id.def_id), impl_vis, tcx)
2079 self.check_assoc_item(
2080 impl_item_ref.id.def_id,
2082 impl_item_ref.defaultness,
2091 pub fn provide(providers: &mut Providers) {
2092 *providers = Providers {
2094 privacy_access_levels,
2095 check_private_in_public,
2101 fn visibility(tcx: TyCtxt<'_>, def_id: DefId) -> ty::Visibility {
2102 let def_id = def_id.expect_local();
2103 match tcx.resolutions(()).visibilities.get(&def_id) {
2106 let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
2107 match tcx.hir().get(hir_id) {
2108 // Unique types created for closures participate in type privacy checking.
2109 // They have visibilities inherited from the module they are defined in.
2110 Node::Expr(hir::Expr { kind: hir::ExprKind::Closure(..), .. }) => {
2111 ty::Visibility::Restricted(tcx.parent_module(hir_id).to_def_id())
2113 // - AST lowering may clone `use` items and the clones don't
2114 // get their entries in the resolver's visibility table.
2115 // - AST lowering also creates opaque type items with inherited visibilies.
2116 // Visibility on them should have no effect, but to avoid the visibility
2117 // query failing on some items, we provide it for opaque types as well.
2118 Node::Item(hir::Item {
2120 kind: hir::ItemKind::Use(..) | hir::ItemKind::OpaqueTy(..),
2122 }) => ty::Visibility::from_hir(vis, hir_id, tcx),
2123 // Visibilities of trait impl items are inherited from their traits
2124 // and are not filled in resolve.
2125 Node::ImplItem(impl_item) => {
2126 match tcx.hir().get(tcx.hir().get_parent_item(hir_id)) {
2127 Node::Item(hir::Item {
2128 kind: hir::ItemKind::Impl(hir::Impl { of_trait: Some(tr), .. }),
2130 }) => tr.path.res.opt_def_id().map_or_else(
2132 tcx.sess.delay_span_bug(tr.path.span, "trait without a def-id");
2133 ty::Visibility::Public
2135 |def_id| tcx.visibility(def_id),
2137 _ => span_bug!(impl_item.span, "the parent is not a trait impl"),
2141 tcx.def_span(def_id),
2142 "visibility table unexpectedly missing a def-id: {:?}",
2150 fn check_mod_privacy(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
2151 // Check privacy of names not checked in previous compilation stages.
2153 NamePrivacyVisitor { tcx, maybe_typeck_results: None, current_item: module_def_id };
2154 let (module, span, hir_id) = tcx.hir().get_module(module_def_id);
2156 intravisit::walk_mod(&mut visitor, module, hir_id);
2158 // Check privacy of explicitly written types and traits as well as
2159 // inferred types of expressions and patterns.
2161 TypePrivacyVisitor { tcx, maybe_typeck_results: None, current_item: module_def_id, span };
2162 intravisit::walk_mod(&mut visitor, module, hir_id);
2165 fn privacy_access_levels(tcx: TyCtxt<'_>, (): ()) -> &AccessLevels {
2166 // Build up a set of all exported items in the AST. This is a set of all
2167 // items which are reachable from external crates based on visibility.
2168 let mut visitor = EmbargoVisitor {
2170 access_levels: Default::default(),
2171 macro_reachable: Default::default(),
2172 prev_level: Some(AccessLevel::Public),
2176 tcx.hir().walk_toplevel_module(&mut visitor);
2177 if visitor.changed {
2178 visitor.changed = false;
2183 visitor.update(CRATE_DEF_ID, Some(AccessLevel::Public));
2185 tcx.arena.alloc(visitor.access_levels)
2188 fn check_private_in_public(tcx: TyCtxt<'_>, (): ()) {
2189 let access_levels = tcx.privacy_access_levels(());
2191 let mut visitor = ObsoleteVisiblePrivateTypesVisitor {
2195 old_error_set: Default::default(),
2197 tcx.hir().walk_toplevel_module(&mut visitor);
2199 let has_pub_restricted = {
2200 let mut pub_restricted_visitor = PubRestrictedVisitor { tcx, has_pub_restricted: false };
2201 tcx.hir().walk_toplevel_module(&mut pub_restricted_visitor);
2202 pub_restricted_visitor.has_pub_restricted
2205 let mut old_error_set_ancestry = HirIdSet::default();
2206 for mut id in visitor.old_error_set.iter().copied() {
2208 if !old_error_set_ancestry.insert(id) {
2211 let parent = tcx.hir().get_parent_node(id);
2219 // Check for private types and traits in public interfaces.
2220 let mut visitor = PrivateItemsInPublicInterfacesVisitor {
2223 // Only definition IDs are ever searched in `old_error_set_ancestry`,
2224 // so we can filter away all non-definition IDs at this point.
2225 old_error_set_ancestry: old_error_set_ancestry
2227 .filter_map(|hir_id| tcx.hir().opt_local_def_id(hir_id))
2230 tcx.hir().visit_all_item_likes(&mut DeepVisitor::new(&mut visitor));