1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
3 #![deny(rust_2018_idioms)]
5 #![deny(unused_lifetimes)]
8 #![feature(rustc_diagnostic_macros)]
10 #![recursion_limit="256"]
12 #[macro_use] extern crate syntax;
15 use rustc::hir::{self, Node, PatKind, AssocItemKind};
16 use rustc::hir::def::{Res, DefKind};
17 use rustc::hir::def_id::{CRATE_DEF_INDEX, LOCAL_CRATE, CrateNum, DefId};
18 use rustc::hir::intravisit::{self, Visitor, NestedVisitorMap};
19 use rustc::hir::itemlikevisit::DeepVisitor;
21 use rustc::middle::privacy::{AccessLevel, AccessLevels};
22 use rustc::ty::{self, TyCtxt, Ty, TraitRef, TypeFoldable, GenericParamDefKind};
23 use rustc::ty::fold::TypeVisitor;
24 use rustc::ty::query::Providers;
25 use rustc::ty::subst::InternalSubsts;
26 use rustc::util::nodemap::HirIdSet;
27 use rustc_data_structures::fx::FxHashSet;
28 use syntax::ast::Ident;
30 use syntax::symbol::{kw, sym};
33 use std::{cmp, fmt, mem};
34 use std::marker::PhantomData;
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<'a, 'tcx: 'a> {
51 fn tcx(&self) -> TyCtxt<'a, 'tcx, 'tcx>;
52 fn shallow(&self) -> bool { false }
53 fn skip_assoc_tys(&self) -> bool { false }
54 fn visit_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool;
56 /// Not overridden, but used to actually visit types and traits.
57 fn skeleton(&mut self) -> DefIdVisitorSkeleton<'_, 'a, 'tcx, Self> {
58 DefIdVisitorSkeleton {
60 visited_opaque_tys: Default::default(),
61 dummy: Default::default(),
64 fn visit(&mut self, ty_fragment: impl TypeFoldable<'tcx>) -> bool {
65 ty_fragment.visit_with(&mut self.skeleton())
67 fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> bool {
68 self.skeleton().visit_trait(trait_ref)
70 fn visit_predicates(&mut self, predicates: &ty::GenericPredicates<'tcx>) -> bool {
71 self.skeleton().visit_predicates(predicates)
75 struct DefIdVisitorSkeleton<'v, 'a, 'tcx, V>
76 where V: DefIdVisitor<'a, 'tcx> + ?Sized
78 def_id_visitor: &'v mut V,
79 visited_opaque_tys: FxHashSet<DefId>,
80 dummy: PhantomData<TyCtxt<'a, 'tcx, 'tcx>>,
83 impl<'a, 'tcx, V> DefIdVisitorSkeleton<'_, 'a, 'tcx, V>
84 where V: DefIdVisitor<'a, 'tcx> + ?Sized
86 fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> bool {
87 let TraitRef { def_id, substs } = trait_ref;
88 self.def_id_visitor.visit_def_id(def_id, "trait", &trait_ref) ||
89 (!self.def_id_visitor.shallow() && substs.visit_with(self))
92 fn visit_predicates(&mut self, predicates: &ty::GenericPredicates<'tcx>) -> bool {
93 let ty::GenericPredicates { parent: _, predicates } = predicates;
94 for (predicate, _span) in predicates {
96 ty::Predicate::Trait(poly_predicate) => {
97 let ty::TraitPredicate { trait_ref } = *poly_predicate.skip_binder();
98 if self.visit_trait(trait_ref) {
102 ty::Predicate::Projection(poly_predicate) => {
103 let ty::ProjectionPredicate { projection_ty, ty } =
104 *poly_predicate.skip_binder();
105 if ty.visit_with(self) {
108 if self.visit_trait(projection_ty.trait_ref(self.def_id_visitor.tcx())) {
112 ty::Predicate::TypeOutlives(poly_predicate) => {
113 let ty::OutlivesPredicate(ty, _region) = *poly_predicate.skip_binder();
114 if ty.visit_with(self) {
118 ty::Predicate::RegionOutlives(..) => {},
119 _ => bug!("unexpected predicate: {:?}", predicate),
126 impl<'a, 'tcx, V> TypeVisitor<'tcx> for DefIdVisitorSkeleton<'_, 'a, 'tcx, V>
127 where V: DefIdVisitor<'a, 'tcx> + ?Sized
129 fn visit_ty(&mut self, ty: Ty<'tcx>) -> bool {
130 let tcx = self.def_id_visitor.tcx();
131 // InternalSubsts are not visited here because they are visited below in `super_visit_with`.
133 ty::Adt(&ty::AdtDef { did: def_id, .. }, ..) |
134 ty::Foreign(def_id) |
135 ty::FnDef(def_id, ..) |
136 ty::Closure(def_id, ..) |
137 ty::Generator(def_id, ..) => {
138 if self.def_id_visitor.visit_def_id(def_id, "type", &ty) {
141 if self.def_id_visitor.shallow() {
144 // Default type visitor doesn't visit signatures of fn types.
145 // Something like `fn() -> Priv {my_func}` is considered a private type even if
146 // `my_func` is public, so we need to visit signatures.
147 if let ty::FnDef(..) = ty.sty {
148 if tcx.fn_sig(def_id).visit_with(self) {
152 // Inherent static methods don't have self type in substs.
153 // Something like `fn() {my_method}` type of the method
154 // `impl Pub<Priv> { pub fn my_method() {} }` is considered a private type,
155 // so we need to visit the self type additionally.
156 if let Some(assoc_item) = tcx.opt_associated_item(def_id) {
157 if let ty::ImplContainer(impl_def_id) = assoc_item.container {
158 if tcx.type_of(impl_def_id).visit_with(self) {
164 ty::Projection(proj) | ty::UnnormalizedProjection(proj) => {
165 if self.def_id_visitor.skip_assoc_tys() {
166 // Visitors searching for minimal visibility/reachability want to
167 // conservatively approximate associated types like `<Type as Trait>::Alias`
168 // as visible/reachable even if both `Type` and `Trait` are private.
169 // Ideally, associated types should be substituted in the same way as
170 // free type aliases, but this isn't done yet.
173 // This will also visit substs if necessary, so we don't need to recurse.
174 return self.visit_trait(proj.trait_ref(tcx));
176 ty::Dynamic(predicates, ..) => {
177 // All traits in the list are considered the "primary" part of the type
178 // and are visited by shallow visitors.
179 for predicate in *predicates.skip_binder() {
180 let trait_ref = match *predicate {
181 ty::ExistentialPredicate::Trait(trait_ref) => trait_ref,
182 ty::ExistentialPredicate::Projection(proj) => proj.trait_ref(tcx),
183 ty::ExistentialPredicate::AutoTrait(def_id) =>
184 ty::ExistentialTraitRef { def_id, substs: InternalSubsts::empty() },
186 let ty::ExistentialTraitRef { def_id, substs: _ } = trait_ref;
187 if self.def_id_visitor.visit_def_id(def_id, "trait", &trait_ref) {
192 ty::Opaque(def_id, ..) => {
193 // Skip repeated `Opaque`s to avoid infinite recursion.
194 if self.visited_opaque_tys.insert(def_id) {
195 // The intent is to treat `impl Trait1 + Trait2` identically to
196 // `dyn Trait1 + Trait2`. Therefore we ignore def-id of the opaque type itself
197 // (it either has no visibility, or its visibility is insignificant, like
198 // visibilities of type aliases) and recurse into predicates instead to go
199 // through the trait list (default type visitor doesn't visit those traits).
200 // All traits in the list are considered the "primary" part of the type
201 // and are visited by shallow visitors.
202 if self.visit_predicates(tcx.predicates_of(def_id)) {
207 // These types don't have their own def-ids (but may have subcomponents
208 // with def-ids that should be visited recursively).
209 ty::Bool | ty::Char | ty::Int(..) | ty::Uint(..) |
210 ty::Float(..) | ty::Str | ty::Never |
211 ty::Array(..) | ty::Slice(..) | ty::Tuple(..) |
212 ty::RawPtr(..) | ty::Ref(..) | ty::FnPtr(..) |
213 ty::Param(..) | ty::Error | ty::GeneratorWitness(..) => {}
214 ty::Bound(..) | ty::Placeholder(..) | ty::Infer(..) =>
215 bug!("unexpected type: {:?}", ty),
218 !self.def_id_visitor.shallow() && ty.super_visit_with(self)
222 fn def_id_visibility<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId)
223 -> (ty::Visibility, Span, &'static str) {
224 match tcx.hir().as_local_hir_id(def_id) {
226 let vis = match tcx.hir().get_by_hir_id(hir_id) {
227 Node::Item(item) => &item.vis,
228 Node::ForeignItem(foreign_item) => &foreign_item.vis,
229 Node::TraitItem(..) | Node::Variant(..) => {
230 return def_id_visibility(tcx, tcx.hir().get_parent_did_by_hir_id(hir_id));
232 Node::ImplItem(impl_item) => {
233 match tcx.hir().get_by_hir_id(tcx.hir().get_parent_item(hir_id)) {
234 Node::Item(item) => match &item.node {
235 hir::ItemKind::Impl(.., None, _, _) => &impl_item.vis,
236 hir::ItemKind::Impl(.., Some(trait_ref), _, _)
237 => return def_id_visibility(tcx, trait_ref.path.res.def_id()),
238 kind => bug!("unexpected item kind: {:?}", kind),
240 node => bug!("unexpected node kind: {:?}", node),
243 Node::Ctor(vdata) => {
244 let parent_hir_id = tcx.hir().get_parent_node_by_hir_id(hir_id);
245 match tcx.hir().get_by_hir_id(parent_hir_id) {
246 Node::Variant(..) => {
247 let parent_did = tcx.hir().local_def_id_from_hir_id(parent_hir_id);
248 let (mut ctor_vis, mut span, mut descr) = def_id_visibility(
252 let adt_def = tcx.adt_def(tcx.hir().get_parent_did_by_hir_id(hir_id));
253 let ctor_did = tcx.hir().local_def_id_from_hir_id(
254 vdata.ctor_hir_id().unwrap());
255 let variant = adt_def.variant_with_ctor_id(ctor_did);
257 if variant.is_field_list_non_exhaustive() &&
258 ctor_vis == ty::Visibility::Public
260 ctor_vis = ty::Visibility::Restricted(
261 DefId::local(CRATE_DEF_INDEX));
262 let attrs = tcx.get_attrs(variant.def_id);
263 span = attr::find_by_name(&attrs, sym::non_exhaustive)
265 descr = "crate-visible";
268 return (ctor_vis, span, descr);
271 let item = match tcx.hir().get_by_hir_id(parent_hir_id) {
272 Node::Item(item) => item,
273 node => bug!("unexpected node kind: {:?}", node),
275 let (mut ctor_vis, mut span, mut descr) =
276 (ty::Visibility::from_hir(&item.vis, parent_hir_id, tcx),
277 item.vis.span, item.vis.node.descr());
278 for field in vdata.fields() {
279 let field_vis = ty::Visibility::from_hir(&field.vis, hir_id, tcx);
280 if ctor_vis.is_at_least(field_vis, tcx) {
281 ctor_vis = field_vis;
282 span = field.vis.span;
283 descr = field.vis.node.descr();
287 // If the structure is marked as non_exhaustive then lower the
288 // visibility to within the crate.
289 if ctor_vis == ty::Visibility::Public {
291 tcx.adt_def(tcx.hir().get_parent_did_by_hir_id(hir_id));
292 if adt_def.non_enum_variant().is_field_list_non_exhaustive() {
294 ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX));
295 span = attr::find_by_name(&item.attrs, sym::non_exhaustive)
297 descr = "crate-visible";
301 return (ctor_vis, span, descr);
303 node => bug!("unexpected node kind: {:?}", node),
306 Node::Expr(expr) => {
307 return (ty::Visibility::Restricted(
308 tcx.hir().get_module_parent_by_hir_id(expr.hir_id)),
309 expr.span, "private")
311 node => bug!("unexpected node kind: {:?}", node)
313 (ty::Visibility::from_hir(vis, hir_id, tcx), vis.span, vis.node.descr())
316 let vis = tcx.visibility(def_id);
317 let descr = if vis == ty::Visibility::Public { "public" } else { "private" };
318 (vis, tcx.def_span(def_id), descr)
323 // Set the correct `TypeckTables` for the given `item_id` (or an empty table if
324 // there is no `TypeckTables` for the item).
325 fn item_tables<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
327 empty_tables: &'a ty::TypeckTables<'tcx>)
328 -> &'a ty::TypeckTables<'tcx> {
329 let def_id = tcx.hir().local_def_id_from_hir_id(hir_id);
330 if tcx.has_typeck_tables(def_id) { tcx.typeck_tables_of(def_id) } else { empty_tables }
333 fn min<'a, 'tcx>(vis1: ty::Visibility, vis2: ty::Visibility, tcx: TyCtxt<'a, 'tcx, 'tcx>)
335 if vis1.is_at_least(vis2, tcx) { vis2 } else { vis1 }
338 ////////////////////////////////////////////////////////////////////////////////
339 /// Visitor used to determine if pub(restricted) is used anywhere in the crate.
341 /// This is done so that `private_in_public` warnings can be turned into hard errors
342 /// in crates that have been updated to use pub(restricted).
343 ////////////////////////////////////////////////////////////////////////////////
344 struct PubRestrictedVisitor<'a, 'tcx: 'a> {
345 tcx: TyCtxt<'a, 'tcx, 'tcx>,
346 has_pub_restricted: bool,
349 impl<'a, 'tcx> Visitor<'tcx> for PubRestrictedVisitor<'a, 'tcx> {
350 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
351 NestedVisitorMap::All(&self.tcx.hir())
353 fn visit_vis(&mut self, vis: &'tcx hir::Visibility) {
354 self.has_pub_restricted = self.has_pub_restricted || vis.node.is_pub_restricted();
358 ////////////////////////////////////////////////////////////////////////////////
359 /// Visitor used to determine impl visibility and reachability.
360 ////////////////////////////////////////////////////////////////////////////////
362 struct FindMin<'a, 'tcx, VL: VisibilityLike> {
363 tcx: TyCtxt<'a, 'tcx, 'tcx>,
364 access_levels: &'a AccessLevels,
368 impl<'a, 'tcx, VL: VisibilityLike> DefIdVisitor<'a, 'tcx> for FindMin<'a, 'tcx, VL> {
369 fn tcx(&self) -> TyCtxt<'a, 'tcx, 'tcx> { self.tcx }
370 fn shallow(&self) -> bool { VL::SHALLOW }
371 fn skip_assoc_tys(&self) -> bool { true }
372 fn visit_def_id(&mut self, def_id: DefId, _kind: &str, _descr: &dyn fmt::Display) -> bool {
373 self.min = VL::new_min(self, def_id);
378 trait VisibilityLike: Sized {
380 const SHALLOW: bool = false;
381 fn new_min<'a, 'tcx>(find: &FindMin<'a, 'tcx, Self>, def_id: DefId) -> Self;
383 // Returns an over-approximation (`skip_assoc_tys` = true) of visibility due to
384 // associated types for which we can't determine visibility precisely.
385 fn of_impl<'a, 'tcx>(hir_id: hir::HirId, tcx: TyCtxt<'a, 'tcx, 'tcx>,
386 access_levels: &'a AccessLevels) -> Self {
387 let mut find = FindMin { tcx, access_levels, min: Self::MAX };
388 let def_id = tcx.hir().local_def_id_from_hir_id(hir_id);
389 find.visit(tcx.type_of(def_id));
390 if let Some(trait_ref) = tcx.impl_trait_ref(def_id) {
391 find.visit_trait(trait_ref);
396 impl VisibilityLike for ty::Visibility {
397 const MAX: Self = ty::Visibility::Public;
398 fn new_min<'a, 'tcx>(find: &FindMin<'a, 'tcx, Self>, def_id: DefId) -> Self {
399 min(def_id_visibility(find.tcx, def_id).0, find.min, find.tcx)
402 impl VisibilityLike for Option<AccessLevel> {
403 const MAX: Self = Some(AccessLevel::Public);
404 // Type inference is very smart sometimes.
405 // It can make an impl reachable even some components of its type or trait are unreachable.
406 // E.g. methods of `impl ReachableTrait<UnreachableTy> for ReachableTy<UnreachableTy> { ... }`
407 // can be usable from other crates (#57264). So we skip substs when calculating reachability
408 // and consider an impl reachable if its "shallow" type and trait are reachable.
410 // The assumption we make here is that type-inference won't let you use an impl without knowing
411 // both "shallow" version of its self type and "shallow" version of its trait if it exists
412 // (which require reaching the `DefId`s in them).
413 const SHALLOW: bool = true;
414 fn new_min<'a, 'tcx>(find: &FindMin<'a, 'tcx, Self>, def_id: DefId) -> Self {
415 cmp::min(if let Some(hir_id) = find.tcx.hir().as_local_hir_id(def_id) {
416 find.access_levels.map.get(&hir_id).cloned()
423 ////////////////////////////////////////////////////////////////////////////////
424 /// The embargo visitor, used to determine the exports of the AST.
425 ////////////////////////////////////////////////////////////////////////////////
427 struct EmbargoVisitor<'a, 'tcx: 'a> {
428 tcx: TyCtxt<'a, 'tcx, 'tcx>,
430 // Accessibility levels for reachable nodes.
431 access_levels: AccessLevels,
432 // Previous accessibility level; `None` means unreachable.
433 prev_level: Option<AccessLevel>,
434 // Has something changed in the level map?
438 struct ReachEverythingInTheInterfaceVisitor<'b, 'a: 'b, 'tcx: 'a> {
439 access_level: Option<AccessLevel>,
441 ev: &'b mut EmbargoVisitor<'a, 'tcx>,
444 impl<'a, 'tcx> EmbargoVisitor<'a, 'tcx> {
445 fn get(&self, id: hir::HirId) -> Option<AccessLevel> {
446 self.access_levels.map.get(&id).cloned()
449 // Updates node level and returns the updated level.
450 fn update(&mut self, id: hir::HirId, level: Option<AccessLevel>) -> Option<AccessLevel> {
451 let old_level = self.get(id);
452 // Accessibility levels can only grow.
453 if level > old_level {
454 self.access_levels.map.insert(id, level.unwrap());
462 fn reach(&mut self, item_id: hir::HirId, access_level: Option<AccessLevel>)
463 -> ReachEverythingInTheInterfaceVisitor<'_, 'a, 'tcx> {
464 ReachEverythingInTheInterfaceVisitor {
465 access_level: cmp::min(access_level, Some(AccessLevel::Reachable)),
466 item_def_id: self.tcx.hir().local_def_id_from_hir_id(item_id),
472 /// Given the path segments of a `ItemKind::Use`, then we need
473 /// to update the visibility of the intermediate use so that it isn't linted
474 /// by `unreachable_pub`.
476 /// This isn't trivial as `path.res` has the `DefId` of the eventual target
477 /// of the use statement not of the next intermediate use statement.
479 /// To do this, consider the last two segments of the path to our intermediate
480 /// use statement. We expect the penultimate segment to be a module and the
481 /// last segment to be the name of the item we are exporting. We can then
482 /// look at the items contained in the module for the use statement with that
483 /// name and update that item's visibility.
485 /// FIXME: This solution won't work with glob imports and doesn't respect
486 /// namespaces. See <https://github.com/rust-lang/rust/pull/57922#discussion_r251234202>.
487 fn update_visibility_of_intermediate_use_statements(&mut self, segments: &[hir::PathSegment]) {
488 if let Some([module, segment]) = segments.rchunks_exact(2).next() {
489 if let Some(item) = module.res
490 .and_then(|res| res.mod_def_id())
491 .and_then(|def_id| self.tcx.hir().as_local_hir_id(def_id))
492 .map(|module_hir_id| self.tcx.hir().expect_item_by_hir_id(module_hir_id))
494 if let hir::ItemKind::Mod(m) = &item.node {
495 for item_id in m.item_ids.as_ref() {
496 let item = self.tcx.hir().expect_item_by_hir_id(item_id.id);
497 let def_id = self.tcx.hir().local_def_id_from_hir_id(item_id.id);
498 if !self.tcx.hygienic_eq(segment.ident, item.ident, def_id) { continue; }
499 if let hir::ItemKind::Use(..) = item.node {
500 self.update(item.hir_id, Some(AccessLevel::Exported));
509 impl<'a, 'tcx> Visitor<'tcx> for EmbargoVisitor<'a, 'tcx> {
510 /// We want to visit items in the context of their containing
511 /// module and so forth, so supply a crate for doing a deep walk.
512 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
513 NestedVisitorMap::All(&self.tcx.hir())
516 fn visit_item(&mut self, item: &'tcx hir::Item) {
517 let inherited_item_level = match item.node {
518 hir::ItemKind::Impl(..) =>
519 Option::<AccessLevel>::of_impl(item.hir_id, self.tcx, &self.access_levels),
520 // Foreign modules inherit level from parents.
521 hir::ItemKind::ForeignMod(..) => self.prev_level,
522 // Other `pub` items inherit levels from parents.
523 hir::ItemKind::Const(..) | hir::ItemKind::Enum(..) | hir::ItemKind::ExternCrate(..) |
524 hir::ItemKind::GlobalAsm(..) | hir::ItemKind::Fn(..) | hir::ItemKind::Mod(..) |
525 hir::ItemKind::Static(..) | hir::ItemKind::Struct(..) |
526 hir::ItemKind::Trait(..) | hir::ItemKind::TraitAlias(..) |
527 hir::ItemKind::Existential(..) |
528 hir::ItemKind::Ty(..) | hir::ItemKind::Union(..) | hir::ItemKind::Use(..) => {
529 if item.vis.node.is_pub() { self.prev_level } else { None }
533 // Update level of the item itself.
534 let item_level = self.update(item.hir_id, inherited_item_level);
536 // Update levels of nested things.
538 hir::ItemKind::Enum(ref def, _) => {
539 for variant in &def.variants {
540 let variant_level = self.update(variant.node.id, item_level);
541 if let Some(ctor_hir_id) = variant.node.data.ctor_hir_id() {
542 self.update(ctor_hir_id, item_level);
544 for field in variant.node.data.fields() {
545 self.update(field.hir_id, variant_level);
549 hir::ItemKind::Impl(.., ref trait_ref, _, ref impl_item_refs) => {
550 for impl_item_ref in impl_item_refs {
551 if trait_ref.is_some() || impl_item_ref.vis.node.is_pub() {
552 self.update(impl_item_ref.id.hir_id, item_level);
556 hir::ItemKind::Trait(.., ref trait_item_refs) => {
557 for trait_item_ref in trait_item_refs {
558 self.update(trait_item_ref.id.hir_id, item_level);
561 hir::ItemKind::Struct(ref def, _) | hir::ItemKind::Union(ref def, _) => {
562 if let Some(ctor_hir_id) = def.ctor_hir_id() {
563 self.update(ctor_hir_id, item_level);
565 for field in def.fields() {
566 if field.vis.node.is_pub() {
567 self.update(field.hir_id, item_level);
571 hir::ItemKind::ForeignMod(ref foreign_mod) => {
572 for foreign_item in &foreign_mod.items {
573 if foreign_item.vis.node.is_pub() {
574 self.update(foreign_item.hir_id, item_level);
578 hir::ItemKind::Existential(..) |
579 hir::ItemKind::Use(..) |
580 hir::ItemKind::Static(..) |
581 hir::ItemKind::Const(..) |
582 hir::ItemKind::GlobalAsm(..) |
583 hir::ItemKind::Ty(..) |
584 hir::ItemKind::Mod(..) |
585 hir::ItemKind::TraitAlias(..) |
586 hir::ItemKind::Fn(..) |
587 hir::ItemKind::ExternCrate(..) => {}
590 // Mark all items in interfaces of reachable items as reachable.
592 // The interface is empty.
593 hir::ItemKind::ExternCrate(..) => {}
594 // All nested items are checked by `visit_item`.
595 hir::ItemKind::Mod(..) => {}
596 // Re-exports are handled in `visit_mod`. However, in order to avoid looping over
597 // all of the items of a mod in `visit_mod` looking for use statements, we handle
598 // making sure that intermediate use statements have their visibilities updated here.
599 hir::ItemKind::Use(ref path, _) => {
600 if item_level.is_some() {
601 self.update_visibility_of_intermediate_use_statements(path.segments.as_ref());
604 // The interface is empty.
605 hir::ItemKind::GlobalAsm(..) => {}
606 hir::ItemKind::Existential(..) => {
607 // FIXME: This is some serious pessimization intended to workaround deficiencies
608 // in the reachability pass (`middle/reachable.rs`). Types are marked as link-time
609 // reachable if they are returned via `impl Trait`, even from private functions.
610 let exist_level = cmp::max(item_level, Some(AccessLevel::ReachableFromImplTrait));
611 self.reach(item.hir_id, exist_level).generics().predicates().ty();
614 hir::ItemKind::Const(..) | hir::ItemKind::Static(..) |
615 hir::ItemKind::Fn(..) | hir::ItemKind::Ty(..) => {
616 if item_level.is_some() {
617 self.reach(item.hir_id, item_level).generics().predicates().ty();
620 hir::ItemKind::Trait(.., ref trait_item_refs) => {
621 if item_level.is_some() {
622 self.reach(item.hir_id, item_level).generics().predicates();
624 for trait_item_ref in trait_item_refs {
625 let mut reach = self.reach(trait_item_ref.id.hir_id, item_level);
626 reach.generics().predicates();
628 if trait_item_ref.kind == AssocItemKind::Type &&
629 !trait_item_ref.defaultness.has_value() {
637 hir::ItemKind::TraitAlias(..) => {
638 if item_level.is_some() {
639 self.reach(item.hir_id, item_level).generics().predicates();
642 // Visit everything except for private impl items.
643 hir::ItemKind::Impl(.., ref impl_item_refs) => {
644 if item_level.is_some() {
645 self.reach(item.hir_id, item_level).generics().predicates().ty().trait_ref();
647 for impl_item_ref in impl_item_refs {
648 let impl_item_level = self.get(impl_item_ref.id.hir_id);
649 if impl_item_level.is_some() {
650 self.reach(impl_item_ref.id.hir_id, impl_item_level)
651 .generics().predicates().ty();
657 // Visit everything, but enum variants have their own levels.
658 hir::ItemKind::Enum(ref def, _) => {
659 if item_level.is_some() {
660 self.reach(item.hir_id, item_level).generics().predicates();
662 for variant in &def.variants {
663 let variant_level = self.get(variant.node.id);
664 if variant_level.is_some() {
665 for field in variant.node.data.fields() {
666 self.reach(field.hir_id, variant_level).ty();
668 // Corner case: if the variant is reachable, but its
669 // enum is not, make the enum reachable as well.
670 self.update(item.hir_id, variant_level);
674 // Visit everything, but foreign items have their own levels.
675 hir::ItemKind::ForeignMod(ref foreign_mod) => {
676 for foreign_item in &foreign_mod.items {
677 let foreign_item_level = self.get(foreign_item.hir_id);
678 if foreign_item_level.is_some() {
679 self.reach(foreign_item.hir_id, foreign_item_level)
680 .generics().predicates().ty();
684 // Visit everything except for private fields.
685 hir::ItemKind::Struct(ref struct_def, _) |
686 hir::ItemKind::Union(ref struct_def, _) => {
687 if item_level.is_some() {
688 self.reach(item.hir_id, item_level).generics().predicates();
689 for field in struct_def.fields() {
690 let field_level = self.get(field.hir_id);
691 if field_level.is_some() {
692 self.reach(field.hir_id, field_level).ty();
699 let orig_level = mem::replace(&mut self.prev_level, item_level);
700 intravisit::walk_item(self, item);
701 self.prev_level = orig_level;
704 fn visit_block(&mut self, b: &'tcx hir::Block) {
705 // Blocks can have public items, for example impls, but they always
706 // start as completely private regardless of publicity of a function,
707 // constant, type, field, etc., in which this block resides.
708 let orig_level = mem::replace(&mut self.prev_level, None);
709 intravisit::walk_block(self, b);
710 self.prev_level = orig_level;
713 fn visit_mod(&mut self, m: &'tcx hir::Mod, _sp: Span, id: hir::HirId) {
714 // This code is here instead of in visit_item so that the
715 // crate module gets processed as well.
716 if self.prev_level.is_some() {
717 let def_id = self.tcx.hir().local_def_id_from_hir_id(id);
718 if let Some(exports) = self.tcx.module_exports(def_id) {
719 for export in exports.iter() {
720 if export.vis == ty::Visibility::Public {
721 if let Some(def_id) = export.res.opt_def_id() {
722 if let Some(hir_id) = self.tcx.hir().as_local_hir_id(def_id) {
723 self.update(hir_id, Some(AccessLevel::Exported));
731 intravisit::walk_mod(self, m, id);
734 fn visit_macro_def(&mut self, md: &'tcx hir::MacroDef) {
736 self.update(md.hir_id, Some(AccessLevel::Public));
740 let module_did = ty::DefIdTree::parent(
742 self.tcx.hir().local_def_id_from_hir_id(md.hir_id)
744 let mut module_id = self.tcx.hir().as_local_hir_id(module_did).unwrap();
745 let level = if md.vis.node.is_pub() { self.get(module_id) } else { None };
746 let level = self.update(md.hir_id, level);
752 let module = if module_id == hir::CRATE_HIR_ID {
753 &self.tcx.hir().krate().module
754 } else if let hir::ItemKind::Mod(ref module) =
755 self.tcx.hir().expect_item_by_hir_id(module_id).node {
760 for id in &module.item_ids {
761 self.update(id.id, level);
763 let def_id = self.tcx.hir().local_def_id_from_hir_id(module_id);
764 if let Some(exports) = self.tcx.module_exports(def_id) {
765 for export in exports.iter() {
766 if let Some(hir_id) = self.tcx.hir().as_local_hir_id(export.res.def_id()) {
767 self.update(hir_id, level);
772 if module_id == hir::CRATE_HIR_ID {
775 module_id = self.tcx.hir().get_parent_node_by_hir_id(module_id);
780 impl<'a, 'tcx> ReachEverythingInTheInterfaceVisitor<'_, 'a, 'tcx> {
781 fn generics(&mut self) -> &mut Self {
782 for param in &self.ev.tcx.generics_of(self.item_def_id).params {
784 GenericParamDefKind::Lifetime => {}
785 GenericParamDefKind::Type { has_default, .. } => {
787 self.visit(self.ev.tcx.type_of(param.def_id));
790 GenericParamDefKind::Const => {
791 self.visit(self.ev.tcx.type_of(param.def_id));
798 fn predicates(&mut self) -> &mut Self {
799 self.visit_predicates(self.ev.tcx.predicates_of(self.item_def_id));
803 fn ty(&mut self) -> &mut Self {
804 self.visit(self.ev.tcx.type_of(self.item_def_id));
808 fn trait_ref(&mut self) -> &mut Self {
809 if let Some(trait_ref) = self.ev.tcx.impl_trait_ref(self.item_def_id) {
810 self.visit_trait(trait_ref);
816 impl<'a, 'tcx> DefIdVisitor<'a, 'tcx> for ReachEverythingInTheInterfaceVisitor<'_, 'a, 'tcx> {
817 fn tcx(&self) -> TyCtxt<'a, 'tcx, 'tcx> { self.ev.tcx }
818 fn visit_def_id(&mut self, def_id: DefId, _kind: &str, _descr: &dyn fmt::Display) -> bool {
819 if let Some(hir_id) = self.ev.tcx.hir().as_local_hir_id(def_id) {
820 self.ev.update(hir_id, self.access_level);
826 //////////////////////////////////////////////////////////////////////////////////////
827 /// Name privacy visitor, checks privacy and reports violations.
828 /// Most of name privacy checks are performed during the main resolution phase,
829 /// or later in type checking when field accesses and associated items are resolved.
830 /// This pass performs remaining checks for fields in struct expressions and patterns.
831 //////////////////////////////////////////////////////////////////////////////////////
833 struct NamePrivacyVisitor<'a, 'tcx: 'a> {
834 tcx: TyCtxt<'a, 'tcx, 'tcx>,
835 tables: &'a ty::TypeckTables<'tcx>,
836 current_item: hir::HirId,
837 empty_tables: &'a ty::TypeckTables<'tcx>,
840 impl<'a, 'tcx> NamePrivacyVisitor<'a, 'tcx> {
841 // Checks that a field in a struct constructor (expression or pattern) is accessible.
842 fn check_field(&mut self,
843 use_ctxt: Span, // syntax context of the field name at the use site
844 span: Span, // span of the field pattern, e.g., `x: 0`
845 def: &'tcx ty::AdtDef, // definition of the struct or enum
846 field: &'tcx ty::FieldDef) { // definition of the field
847 let ident = Ident::new(kw::Invalid, use_ctxt);
848 let current_hir = self.current_item;
849 let def_id = self.tcx.adjust_ident_and_get_scope(ident, def.did, current_hir).1;
850 if !def.is_enum() && !field.vis.is_accessible_from(def_id, self.tcx) {
851 struct_span_err!(self.tcx.sess, span, E0451, "field `{}` of {} `{}` is private",
852 field.ident, def.variant_descr(), self.tcx.def_path_str(def.did))
853 .span_label(span, format!("field `{}` is private", field.ident))
859 impl<'a, 'tcx> Visitor<'tcx> for NamePrivacyVisitor<'a, 'tcx> {
860 /// We want to visit items in the context of their containing
861 /// module and so forth, so supply a crate for doing a deep walk.
862 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
863 NestedVisitorMap::All(&self.tcx.hir())
866 fn visit_mod(&mut self, _m: &'tcx hir::Mod, _s: Span, _n: hir::HirId) {
867 // Don't visit nested modules, since we run a separate visitor walk
868 // for each module in `privacy_access_levels`
871 fn visit_nested_body(&mut self, body: hir::BodyId) {
872 let orig_tables = mem::replace(&mut self.tables, self.tcx.body_tables(body));
873 let body = self.tcx.hir().body(body);
874 self.visit_body(body);
875 self.tables = orig_tables;
878 fn visit_item(&mut self, item: &'tcx hir::Item) {
879 let orig_current_item = mem::replace(&mut self.current_item, item.hir_id);
881 mem::replace(&mut self.tables, item_tables(self.tcx, item.hir_id, self.empty_tables));
882 intravisit::walk_item(self, item);
883 self.current_item = orig_current_item;
884 self.tables = orig_tables;
887 fn visit_trait_item(&mut self, ti: &'tcx hir::TraitItem) {
889 mem::replace(&mut self.tables, item_tables(self.tcx, ti.hir_id, self.empty_tables));
890 intravisit::walk_trait_item(self, ti);
891 self.tables = orig_tables;
894 fn visit_impl_item(&mut self, ii: &'tcx hir::ImplItem) {
896 mem::replace(&mut self.tables, item_tables(self.tcx, ii.hir_id, self.empty_tables));
897 intravisit::walk_impl_item(self, ii);
898 self.tables = orig_tables;
901 fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
903 hir::ExprKind::Struct(ref qpath, ref fields, ref base) => {
904 let res = self.tables.qpath_res(qpath, expr.hir_id);
905 let adt = self.tables.expr_ty(expr).ty_adt_def().unwrap();
906 let variant = adt.variant_of_res(res);
907 if let Some(ref base) = *base {
908 // If the expression uses FRU we need to make sure all the unmentioned fields
909 // are checked for privacy (RFC 736). Rather than computing the set of
910 // unmentioned fields, just check them all.
911 for (vf_index, variant_field) in variant.fields.iter().enumerate() {
912 let field = fields.iter().find(|f| {
913 self.tcx.field_index(f.hir_id, self.tables) == vf_index
915 let (use_ctxt, span) = match field {
916 Some(field) => (field.ident.span, field.span),
917 None => (base.span, base.span),
919 self.check_field(use_ctxt, span, adt, variant_field);
922 for field in fields {
923 let use_ctxt = field.ident.span;
924 let index = self.tcx.field_index(field.hir_id, self.tables);
925 self.check_field(use_ctxt, field.span, adt, &variant.fields[index]);
932 intravisit::walk_expr(self, expr);
935 fn visit_pat(&mut self, pat: &'tcx hir::Pat) {
937 PatKind::Struct(ref qpath, ref fields, _) => {
938 let res = self.tables.qpath_res(qpath, pat.hir_id);
939 let adt = self.tables.pat_ty(pat).ty_adt_def().unwrap();
940 let variant = adt.variant_of_res(res);
941 for field in fields {
942 let use_ctxt = field.node.ident.span;
943 let index = self.tcx.field_index(field.node.hir_id, self.tables);
944 self.check_field(use_ctxt, field.span, adt, &variant.fields[index]);
950 intravisit::walk_pat(self, pat);
954 ////////////////////////////////////////////////////////////////////////////////////////////
955 /// Type privacy visitor, checks types for privacy and reports violations.
956 /// Both explicitly written types and inferred types of expressions and patters are checked.
957 /// Checks are performed on "semantic" types regardless of names and their hygiene.
958 ////////////////////////////////////////////////////////////////////////////////////////////
960 struct TypePrivacyVisitor<'a, 'tcx: 'a> {
961 tcx: TyCtxt<'a, 'tcx, 'tcx>,
962 tables: &'a ty::TypeckTables<'tcx>,
966 empty_tables: &'a ty::TypeckTables<'tcx>,
969 impl<'a, 'tcx> TypePrivacyVisitor<'a, 'tcx> {
970 fn item_is_accessible(&self, did: DefId) -> bool {
971 def_id_visibility(self.tcx, did).0.is_accessible_from(self.current_item, self.tcx)
974 // Take node-id of an expression or pattern and check its type for privacy.
975 fn check_expr_pat_type(&mut self, id: hir::HirId, span: Span) -> bool {
977 if self.visit(self.tables.node_type(id)) || self.visit(self.tables.node_substs(id)) {
980 if let Some(adjustments) = self.tables.adjustments().get(id) {
981 for adjustment in adjustments {
982 if self.visit(adjustment.target) {
990 fn check_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {
991 let is_error = !self.item_is_accessible(def_id);
993 self.tcx.sess.span_err(self.span, &format!("{} `{}` is private", kind, descr));
999 impl<'a, 'tcx> Visitor<'tcx> for TypePrivacyVisitor<'a, 'tcx> {
1000 /// We want to visit items in the context of their containing
1001 /// module and so forth, so supply a crate for doing a deep walk.
1002 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
1003 NestedVisitorMap::All(&self.tcx.hir())
1006 fn visit_mod(&mut self, _m: &'tcx hir::Mod, _s: Span, _n: hir::HirId) {
1007 // Don't visit nested modules, since we run a separate visitor walk
1008 // for each module in `privacy_access_levels`
1011 fn visit_nested_body(&mut self, body: hir::BodyId) {
1012 let orig_tables = mem::replace(&mut self.tables, self.tcx.body_tables(body));
1013 let orig_in_body = mem::replace(&mut self.in_body, true);
1014 let body = self.tcx.hir().body(body);
1015 self.visit_body(body);
1016 self.tables = orig_tables;
1017 self.in_body = orig_in_body;
1020 fn visit_ty(&mut self, hir_ty: &'tcx hir::Ty) {
1021 self.span = hir_ty.span;
1024 if self.visit(self.tables.node_type(hir_ty.hir_id)) {
1028 // Types in signatures.
1029 // FIXME: This is very ineffective. Ideally each HIR type should be converted
1030 // into a semantic type only once and the result should be cached somehow.
1031 if self.visit(rustc_typeck::hir_ty_to_ty(self.tcx, hir_ty)) {
1036 intravisit::walk_ty(self, hir_ty);
1039 fn visit_trait_ref(&mut self, trait_ref: &'tcx hir::TraitRef) {
1040 self.span = trait_ref.path.span;
1042 // Avoid calling `hir_trait_to_predicates` in bodies, it will ICE.
1043 // The traits' privacy in bodies is already checked as a part of trait object types.
1044 let (principal, bounds) = rustc_typeck::hir_trait_to_predicates(self.tcx, trait_ref);
1045 if self.visit_trait(*principal.skip_binder()) {
1048 for (poly_predicate, _) in bounds.projection_bounds {
1050 if self.visit(poly_predicate.skip_binder().ty) ||
1051 self.visit_trait(poly_predicate.skip_binder().projection_ty.trait_ref(tcx)) {
1057 intravisit::walk_trait_ref(self, trait_ref);
1060 // Check types of expressions
1061 fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
1062 if self.check_expr_pat_type(expr.hir_id, expr.span) {
1063 // Do not check nested expressions if the error already happened.
1067 hir::ExprKind::Assign(.., ref rhs) | hir::ExprKind::Match(ref rhs, ..) => {
1068 // Do not report duplicate errors for `x = y` and `match x { ... }`.
1069 if self.check_expr_pat_type(rhs.hir_id, rhs.span) {
1073 hir::ExprKind::MethodCall(_, span, _) => {
1074 // Method calls have to be checked specially.
1076 if let Some(def_id) = self.tables.type_dependent_def_id(expr.hir_id) {
1077 if self.visit(self.tcx.type_of(def_id)) {
1081 self.tcx.sess.delay_span_bug(expr.span,
1082 "no type-dependent def for method call");
1088 intravisit::walk_expr(self, expr);
1091 // Prohibit access to associated items with insufficient nominal visibility.
1093 // Additionally, until better reachability analysis for macros 2.0 is available,
1094 // we prohibit access to private statics from other crates, this allows to give
1095 // more code internal visibility at link time. (Access to private functions
1096 // is already prohibited by type privacy for function types.)
1097 fn visit_qpath(&mut self, qpath: &'tcx hir::QPath, id: hir::HirId, span: Span) {
1098 let def = match self.tables.qpath_res(qpath, id) {
1099 Res::Def(kind, def_id) => Some((kind, def_id)),
1102 let def = def.filter(|(kind, _)| {
1105 | DefKind::AssocConst
1107 | DefKind::AssocExistential
1108 | DefKind::Static => true,
1112 if let Some((kind, def_id)) = def {
1113 let is_local_static = if let DefKind::Static = kind {
1116 if !self.item_is_accessible(def_id) && !is_local_static {
1117 let name = match *qpath {
1118 hir::QPath::Resolved(_, ref path) => path.to_string(),
1119 hir::QPath::TypeRelative(_, ref segment) => segment.ident.to_string(),
1121 let msg = format!("{} `{}` is private", kind.descr(), name);
1122 self.tcx.sess.span_err(span, &msg);
1127 intravisit::walk_qpath(self, qpath, id, span);
1130 // Check types of patterns.
1131 fn visit_pat(&mut self, pattern: &'tcx hir::Pat) {
1132 if self.check_expr_pat_type(pattern.hir_id, pattern.span) {
1133 // Do not check nested patterns if the error already happened.
1137 intravisit::walk_pat(self, pattern);
1140 fn visit_local(&mut self, local: &'tcx hir::Local) {
1141 if let Some(ref init) = local.init {
1142 if self.check_expr_pat_type(init.hir_id, init.span) {
1143 // Do not report duplicate errors for `let x = y`.
1148 intravisit::walk_local(self, local);
1151 // Check types in item interfaces.
1152 fn visit_item(&mut self, item: &'tcx hir::Item) {
1153 let orig_current_item = mem::replace(&mut self.current_item,
1154 self.tcx.hir().local_def_id_from_hir_id(item.hir_id));
1155 let orig_in_body = mem::replace(&mut self.in_body, false);
1157 mem::replace(&mut self.tables, item_tables(self.tcx, item.hir_id, self.empty_tables));
1158 intravisit::walk_item(self, item);
1159 self.tables = orig_tables;
1160 self.in_body = orig_in_body;
1161 self.current_item = orig_current_item;
1164 fn visit_trait_item(&mut self, ti: &'tcx hir::TraitItem) {
1166 mem::replace(&mut self.tables, item_tables(self.tcx, ti.hir_id, self.empty_tables));
1167 intravisit::walk_trait_item(self, ti);
1168 self.tables = orig_tables;
1171 fn visit_impl_item(&mut self, ii: &'tcx hir::ImplItem) {
1173 mem::replace(&mut self.tables, item_tables(self.tcx, ii.hir_id, self.empty_tables));
1174 intravisit::walk_impl_item(self, ii);
1175 self.tables = orig_tables;
1179 impl<'a, 'tcx> DefIdVisitor<'a, 'tcx> for TypePrivacyVisitor<'a, 'tcx> {
1180 fn tcx(&self) -> TyCtxt<'a, 'tcx, 'tcx> { self.tcx }
1181 fn visit_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {
1182 self.check_def_id(def_id, kind, descr)
1186 ///////////////////////////////////////////////////////////////////////////////
1187 /// Obsolete visitors for checking for private items in public interfaces.
1188 /// These visitors are supposed to be kept in frozen state and produce an
1189 /// "old error node set". For backward compatibility the new visitor reports
1190 /// warnings instead of hard errors when the erroneous node is not in this old set.
1191 ///////////////////////////////////////////////////////////////////////////////
1193 struct ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx: 'a> {
1194 tcx: TyCtxt<'a, 'tcx, 'tcx>,
1195 access_levels: &'a AccessLevels,
1197 // Set of errors produced by this obsolete visitor.
1198 old_error_set: HirIdSet,
1201 struct ObsoleteCheckTypeForPrivatenessVisitor<'a, 'b: 'a, 'tcx: 'b> {
1202 inner: &'a ObsoleteVisiblePrivateTypesVisitor<'b, 'tcx>,
1203 /// Whether the type refers to private types.
1204 contains_private: bool,
1205 /// Whether we've recurred at all (i.e., if we're pointing at the
1206 /// first type on which `visit_ty` was called).
1207 at_outer_type: bool,
1208 /// Whether that first type is a public path.
1209 outer_type_is_public_path: bool,
1212 impl<'a, 'tcx> ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
1213 fn path_is_private_type(&self, path: &hir::Path) -> bool {
1214 let did = match path.res {
1215 Res::PrimTy(..) | Res::SelfTy(..) | Res::Err => return false,
1216 res => res.def_id(),
1219 // A path can only be private if:
1220 // it's in this crate...
1221 if let Some(hir_id) = self.tcx.hir().as_local_hir_id(did) {
1222 // .. and it corresponds to a private type in the AST (this returns
1223 // `None` for type parameters).
1224 match self.tcx.hir().find_by_hir_id(hir_id) {
1225 Some(Node::Item(ref item)) => !item.vis.node.is_pub(),
1226 Some(_) | None => false,
1233 fn trait_is_public(&self, trait_id: hir::HirId) -> bool {
1234 // FIXME: this would preferably be using `exported_items`, but all
1235 // traits are exported currently (see `EmbargoVisitor.exported_trait`).
1236 self.access_levels.is_public(trait_id)
1239 fn check_generic_bound(&mut self, bound: &hir::GenericBound) {
1240 if let hir::GenericBound::Trait(ref trait_ref, _) = *bound {
1241 if self.path_is_private_type(&trait_ref.trait_ref.path) {
1242 self.old_error_set.insert(trait_ref.trait_ref.hir_ref_id);
1247 fn item_is_public(&self, id: &hir::HirId, vis: &hir::Visibility) -> bool {
1248 self.access_levels.is_reachable(*id) || vis.node.is_pub()
1252 impl<'a, 'b, 'tcx, 'v> Visitor<'v> for ObsoleteCheckTypeForPrivatenessVisitor<'a, 'b, 'tcx> {
1253 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'v> {
1254 NestedVisitorMap::None
1257 fn visit_ty(&mut self, ty: &hir::Ty) {
1258 if let hir::TyKind::Path(hir::QPath::Resolved(_, ref path)) = ty.node {
1259 if self.inner.path_is_private_type(path) {
1260 self.contains_private = true;
1261 // Found what we're looking for, so let's stop working.
1265 if let hir::TyKind::Path(_) = ty.node {
1266 if self.at_outer_type {
1267 self.outer_type_is_public_path = true;
1270 self.at_outer_type = false;
1271 intravisit::walk_ty(self, ty)
1274 // Don't want to recurse into `[, .. expr]`.
1275 fn visit_expr(&mut self, _: &hir::Expr) {}
1278 impl<'a, 'tcx> Visitor<'tcx> for ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
1279 /// We want to visit items in the context of their containing
1280 /// module and so forth, so supply a crate for doing a deep walk.
1281 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
1282 NestedVisitorMap::All(&self.tcx.hir())
1285 fn visit_item(&mut self, item: &'tcx hir::Item) {
1287 // Contents of a private mod can be re-exported, so we need
1288 // to check internals.
1289 hir::ItemKind::Mod(_) => {}
1291 // An `extern {}` doesn't introduce a new privacy
1292 // namespace (the contents have their own privacies).
1293 hir::ItemKind::ForeignMod(_) => {}
1295 hir::ItemKind::Trait(.., ref bounds, _) => {
1296 if !self.trait_is_public(item.hir_id) {
1300 for bound in bounds.iter() {
1301 self.check_generic_bound(bound)
1305 // Impls need some special handling to try to offer useful
1306 // error messages without (too many) false positives
1307 // (i.e., we could just return here to not check them at
1308 // all, or some worse estimation of whether an impl is
1309 // publicly visible).
1310 hir::ItemKind::Impl(.., ref g, ref trait_ref, ref self_, ref impl_item_refs) => {
1311 // `impl [... for] Private` is never visible.
1312 let self_contains_private;
1313 // `impl [... for] Public<...>`, but not `impl [... for]
1314 // Vec<Public>` or `(Public,)`, etc.
1315 let self_is_public_path;
1317 // Check the properties of the `Self` type:
1319 let mut visitor = ObsoleteCheckTypeForPrivatenessVisitor {
1321 contains_private: false,
1322 at_outer_type: true,
1323 outer_type_is_public_path: false,
1325 visitor.visit_ty(&self_);
1326 self_contains_private = visitor.contains_private;
1327 self_is_public_path = visitor.outer_type_is_public_path;
1330 // Miscellaneous info about the impl:
1332 // `true` iff this is `impl Private for ...`.
1333 let not_private_trait =
1334 trait_ref.as_ref().map_or(true, // no trait counts as public trait
1336 let did = tr.path.res.def_id();
1338 if let Some(hir_id) = self.tcx.hir().as_local_hir_id(did) {
1339 self.trait_is_public(hir_id)
1341 true // external traits must be public
1345 // `true` iff this is a trait impl or at least one method is public.
1347 // `impl Public { $( fn ...() {} )* }` is not visible.
1349 // This is required over just using the methods' privacy
1350 // directly because we might have `impl<T: Foo<Private>> ...`,
1351 // and we shouldn't warn about the generics if all the methods
1352 // are private (because `T` won't be visible externally).
1353 let trait_or_some_public_method =
1354 trait_ref.is_some() ||
1355 impl_item_refs.iter()
1356 .any(|impl_item_ref| {
1357 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1358 match impl_item.node {
1359 hir::ImplItemKind::Const(..) |
1360 hir::ImplItemKind::Method(..) => {
1361 self.access_levels.is_reachable(
1362 impl_item_ref.id.hir_id)
1364 hir::ImplItemKind::Existential(..) |
1365 hir::ImplItemKind::Type(_) => false,
1369 if !self_contains_private &&
1370 not_private_trait &&
1371 trait_or_some_public_method {
1373 intravisit::walk_generics(self, g);
1377 for impl_item_ref in impl_item_refs {
1378 // This is where we choose whether to walk down
1379 // further into the impl to check its items. We
1380 // should only walk into public items so that we
1381 // don't erroneously report errors for private
1382 // types in private items.
1383 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1384 match impl_item.node {
1385 hir::ImplItemKind::Const(..) |
1386 hir::ImplItemKind::Method(..)
1387 if self.item_is_public(&impl_item.hir_id, &impl_item.vis) =>
1389 intravisit::walk_impl_item(self, impl_item)
1391 hir::ImplItemKind::Type(..) => {
1392 intravisit::walk_impl_item(self, impl_item)
1399 // Any private types in a trait impl fall into three
1401 // 1. mentioned in the trait definition
1402 // 2. mentioned in the type params/generics
1403 // 3. mentioned in the associated types of the impl
1405 // Those in 1. can only occur if the trait is in
1406 // this crate and will've been warned about on the
1407 // trait definition (there's no need to warn twice
1408 // so we don't check the methods).
1410 // Those in 2. are warned via walk_generics and this
1412 intravisit::walk_path(self, &tr.path);
1414 // Those in 3. are warned with this call.
1415 for impl_item_ref in impl_item_refs {
1416 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1417 if let hir::ImplItemKind::Type(ref ty) = impl_item.node {
1423 } else if trait_ref.is_none() && self_is_public_path {
1424 // `impl Public<Private> { ... }`. Any public static
1425 // methods will be visible as `Public::foo`.
1426 let mut found_pub_static = false;
1427 for impl_item_ref in impl_item_refs {
1428 if self.item_is_public(&impl_item_ref.id.hir_id, &impl_item_ref.vis) {
1429 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
1430 match impl_item_ref.kind {
1431 AssocItemKind::Const => {
1432 found_pub_static = true;
1433 intravisit::walk_impl_item(self, impl_item);
1435 AssocItemKind::Method { has_self: false } => {
1436 found_pub_static = true;
1437 intravisit::walk_impl_item(self, impl_item);
1443 if found_pub_static {
1444 intravisit::walk_generics(self, g)
1450 // `type ... = ...;` can contain private types, because
1451 // we're introducing a new name.
1452 hir::ItemKind::Ty(..) => return,
1454 // Not at all public, so we don't care.
1455 _ if !self.item_is_public(&item.hir_id, &item.vis) => {
1462 // We've carefully constructed it so that if we're here, then
1463 // any `visit_ty`'s will be called on things that are in
1464 // public signatures, i.e., things that we're interested in for
1466 intravisit::walk_item(self, item);
1469 fn visit_generics(&mut self, generics: &'tcx hir::Generics) {
1470 for param in &generics.params {
1471 for bound in ¶m.bounds {
1472 self.check_generic_bound(bound);
1475 for predicate in &generics.where_clause.predicates {
1477 hir::WherePredicate::BoundPredicate(bound_pred) => {
1478 for bound in bound_pred.bounds.iter() {
1479 self.check_generic_bound(bound)
1482 hir::WherePredicate::RegionPredicate(_) => {}
1483 hir::WherePredicate::EqPredicate(eq_pred) => {
1484 self.visit_ty(&eq_pred.rhs_ty);
1490 fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem) {
1491 if self.access_levels.is_reachable(item.hir_id) {
1492 intravisit::walk_foreign_item(self, item)
1496 fn visit_ty(&mut self, t: &'tcx hir::Ty) {
1497 if let hir::TyKind::Path(hir::QPath::Resolved(_, ref path)) = t.node {
1498 if self.path_is_private_type(path) {
1499 self.old_error_set.insert(t.hir_id);
1502 intravisit::walk_ty(self, t)
1505 fn visit_variant(&mut self,
1506 v: &'tcx hir::Variant,
1507 g: &'tcx hir::Generics,
1508 item_id: hir::HirId) {
1509 if self.access_levels.is_reachable(v.node.id) {
1510 self.in_variant = true;
1511 intravisit::walk_variant(self, v, g, item_id);
1512 self.in_variant = false;
1516 fn visit_struct_field(&mut self, s: &'tcx hir::StructField) {
1517 if s.vis.node.is_pub() || self.in_variant {
1518 intravisit::walk_struct_field(self, s);
1522 // We don't need to introspect into these at all: an
1523 // expression/block context can't possibly contain exported things.
1524 // (Making them no-ops stops us from traversing the whole AST without
1525 // having to be super careful about our `walk_...` calls above.)
1526 fn visit_block(&mut self, _: &'tcx hir::Block) {}
1527 fn visit_expr(&mut self, _: &'tcx hir::Expr) {}
1530 ///////////////////////////////////////////////////////////////////////////////
1531 /// SearchInterfaceForPrivateItemsVisitor traverses an item's interface and
1532 /// finds any private components in it.
1533 /// PrivateItemsInPublicInterfacesVisitor ensures there are no private types
1534 /// and traits in public interfaces.
1535 ///////////////////////////////////////////////////////////////////////////////
1537 struct SearchInterfaceForPrivateItemsVisitor<'a, 'tcx: 'a> {
1538 tcx: TyCtxt<'a, 'tcx, 'tcx>,
1539 item_id: hir::HirId,
1542 /// The visitor checks that each component type is at least this visible.
1543 required_visibility: ty::Visibility,
1544 has_pub_restricted: bool,
1545 has_old_errors: bool,
1549 impl<'a, 'tcx: 'a> SearchInterfaceForPrivateItemsVisitor<'a, 'tcx> {
1550 fn generics(&mut self) -> &mut Self {
1551 for param in &self.tcx.generics_of(self.item_def_id).params {
1553 GenericParamDefKind::Lifetime => {}
1554 GenericParamDefKind::Type { has_default, .. } => {
1556 self.visit(self.tcx.type_of(param.def_id));
1559 GenericParamDefKind::Const => {
1560 self.visit(self.tcx.type_of(param.def_id));
1567 fn predicates(&mut self) -> &mut Self {
1568 // N.B., we use `explicit_predicates_of` and not `predicates_of`
1569 // because we don't want to report privacy errors due to where
1570 // clauses that the compiler inferred. We only want to
1571 // consider the ones that the user wrote. This is important
1572 // for the inferred outlives rules; see
1573 // `src/test/ui/rfc-2093-infer-outlives/privacy.rs`.
1574 self.visit_predicates(self.tcx.explicit_predicates_of(self.item_def_id));
1578 fn ty(&mut self) -> &mut Self {
1579 self.visit(self.tcx.type_of(self.item_def_id));
1583 fn check_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {
1584 if self.leaks_private_dep(def_id) {
1585 self.tcx.lint_hir(lint::builtin::EXPORTED_PRIVATE_DEPENDENCIES,
1588 &format!("{} `{}` from private dependency '{}' in public \
1589 interface", kind, descr,
1590 self.tcx.crate_name(def_id.krate)));
1594 let hir_id = match self.tcx.hir().as_local_hir_id(def_id) {
1595 Some(hir_id) => hir_id,
1596 None => return false,
1599 let (vis, vis_span, vis_descr) = def_id_visibility(self.tcx, def_id);
1600 if !vis.is_at_least(self.required_visibility, self.tcx) {
1601 let msg = format!("{} {} `{}` in public interface", vis_descr, kind, descr);
1602 if self.has_pub_restricted || self.has_old_errors || self.in_assoc_ty {
1603 let mut err = if kind == "trait" {
1604 struct_span_err!(self.tcx.sess, self.span, E0445, "{}", msg)
1606 struct_span_err!(self.tcx.sess, self.span, E0446, "{}", msg)
1608 err.span_label(self.span, format!("can't leak {} {}", vis_descr, kind));
1609 err.span_label(vis_span, format!("`{}` declared as {}", descr, vis_descr));
1612 let err_code = if kind == "trait" { "E0445" } else { "E0446" };
1613 self.tcx.lint_hir(lint::builtin::PRIVATE_IN_PUBLIC, hir_id, self.span,
1614 &format!("{} (error {})", msg, err_code));
1622 /// An item is 'leaked' from a private dependency if all
1623 /// of the following are true:
1624 /// 1. It's contained within a public type
1625 /// 2. It comes from a private crate
1626 fn leaks_private_dep(&self, item_id: DefId) -> bool {
1627 let ret = self.required_visibility == ty::Visibility::Public &&
1628 self.tcx.is_private_dep(item_id.krate);
1630 log::debug!("leaks_private_dep(item_id={:?})={}", item_id, ret);
1635 impl<'a, 'tcx> DefIdVisitor<'a, 'tcx> for SearchInterfaceForPrivateItemsVisitor<'a, 'tcx> {
1636 fn tcx(&self) -> TyCtxt<'a, 'tcx, 'tcx> { self.tcx }
1637 fn visit_def_id(&mut self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {
1638 self.check_def_id(def_id, kind, descr)
1642 struct PrivateItemsInPublicInterfacesVisitor<'a, 'tcx: 'a> {
1643 tcx: TyCtxt<'a, 'tcx, 'tcx>,
1644 has_pub_restricted: bool,
1645 old_error_set: &'a HirIdSet,
1648 impl<'a, 'tcx> PrivateItemsInPublicInterfacesVisitor<'a, 'tcx> {
1649 fn check(&self, item_id: hir::HirId, required_visibility: ty::Visibility)
1650 -> SearchInterfaceForPrivateItemsVisitor<'a, 'tcx> {
1651 let mut has_old_errors = false;
1653 // Slow path taken only if there any errors in the crate.
1654 for &id in self.old_error_set {
1655 // Walk up the nodes until we find `item_id` (or we hit a root).
1659 has_old_errors = true;
1662 let parent = self.tcx.hir().get_parent_node_by_hir_id(id);
1674 SearchInterfaceForPrivateItemsVisitor {
1677 item_def_id: self.tcx.hir().local_def_id_from_hir_id(item_id),
1678 span: self.tcx.hir().span_by_hir_id(item_id),
1679 required_visibility,
1680 has_pub_restricted: self.has_pub_restricted,
1686 fn check_assoc_item(
1689 assoc_item_kind: AssocItemKind,
1690 defaultness: hir::Defaultness,
1691 vis: ty::Visibility,
1693 let mut check = self.check(hir_id, vis);
1695 let (check_ty, is_assoc_ty) = match assoc_item_kind {
1696 AssocItemKind::Const | AssocItemKind::Method { .. } => (true, false),
1697 AssocItemKind::Type => (defaultness.has_value(), true),
1698 // `ty()` for existential types is the underlying type,
1699 // it's not a part of interface, so we skip it.
1700 AssocItemKind::Existential => (false, true),
1702 check.in_assoc_ty = is_assoc_ty;
1703 check.generics().predicates();
1710 impl<'a, 'tcx> Visitor<'tcx> for PrivateItemsInPublicInterfacesVisitor<'a, 'tcx> {
1711 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
1712 NestedVisitorMap::OnlyBodies(&self.tcx.hir())
1715 fn visit_item(&mut self, item: &'tcx hir::Item) {
1717 let item_visibility = ty::Visibility::from_hir(&item.vis, item.hir_id, tcx);
1720 // Crates are always public.
1721 hir::ItemKind::ExternCrate(..) => {}
1722 // All nested items are checked by `visit_item`.
1723 hir::ItemKind::Mod(..) => {}
1724 // Checked in resolve.
1725 hir::ItemKind::Use(..) => {}
1727 hir::ItemKind::GlobalAsm(..) => {}
1728 // Subitems of these items have inherited publicity.
1729 hir::ItemKind::Const(..) | hir::ItemKind::Static(..) |
1730 hir::ItemKind::Fn(..) | hir::ItemKind::Ty(..) => {
1731 self.check(item.hir_id, item_visibility).generics().predicates().ty();
1733 hir::ItemKind::Existential(..) => {
1734 // `ty()` for existential types is the underlying type,
1735 // it's not a part of interface, so we skip it.
1736 self.check(item.hir_id, item_visibility).generics().predicates();
1738 hir::ItemKind::Trait(.., ref trait_item_refs) => {
1739 self.check(item.hir_id, item_visibility).generics().predicates();
1741 for trait_item_ref in trait_item_refs {
1742 self.check_assoc_item(
1743 trait_item_ref.id.hir_id,
1744 trait_item_ref.kind,
1745 trait_item_ref.defaultness,
1750 hir::ItemKind::TraitAlias(..) => {
1751 self.check(item.hir_id, item_visibility).generics().predicates();
1753 hir::ItemKind::Enum(ref def, _) => {
1754 self.check(item.hir_id, item_visibility).generics().predicates();
1756 for variant in &def.variants {
1757 for field in variant.node.data.fields() {
1758 self.check(field.hir_id, item_visibility).ty();
1762 // Subitems of foreign modules have their own publicity.
1763 hir::ItemKind::ForeignMod(ref foreign_mod) => {
1764 for foreign_item in &foreign_mod.items {
1765 let vis = ty::Visibility::from_hir(&foreign_item.vis, item.hir_id, tcx);
1766 self.check(foreign_item.hir_id, vis).generics().predicates().ty();
1769 // Subitems of structs and unions have their own publicity.
1770 hir::ItemKind::Struct(ref struct_def, _) |
1771 hir::ItemKind::Union(ref struct_def, _) => {
1772 self.check(item.hir_id, item_visibility).generics().predicates();
1774 for field in struct_def.fields() {
1775 let field_visibility = ty::Visibility::from_hir(&field.vis, item.hir_id, tcx);
1776 self.check(field.hir_id, min(item_visibility, field_visibility, tcx)).ty();
1779 // An inherent impl is public when its type is public
1780 // Subitems of inherent impls have their own publicity.
1781 // A trait impl is public when both its type and its trait are public
1782 // Subitems of trait impls have inherited publicity.
1783 hir::ItemKind::Impl(.., ref trait_ref, _, ref impl_item_refs) => {
1784 let impl_vis = ty::Visibility::of_impl(item.hir_id, tcx, &Default::default());
1785 self.check(item.hir_id, impl_vis).generics().predicates();
1786 for impl_item_ref in impl_item_refs {
1787 let impl_item = tcx.hir().impl_item(impl_item_ref.id);
1788 let impl_item_vis = if trait_ref.is_none() {
1789 min(ty::Visibility::from_hir(&impl_item.vis, item.hir_id, tcx),
1795 self.check_assoc_item(
1796 impl_item_ref.id.hir_id,
1798 impl_item_ref.defaultness,
1807 pub fn provide(providers: &mut Providers<'_>) {
1808 *providers = Providers {
1809 privacy_access_levels,
1810 check_private_in_public,
1816 fn check_mod_privacy<'tcx>(tcx: TyCtxt<'_, 'tcx, 'tcx>, module_def_id: DefId) {
1817 let empty_tables = ty::TypeckTables::empty(None);
1819 // Check privacy of names not checked in previous compilation stages.
1820 let mut visitor = NamePrivacyVisitor {
1822 tables: &empty_tables,
1823 current_item: hir::DUMMY_HIR_ID,
1824 empty_tables: &empty_tables,
1826 let (module, span, hir_id) = tcx.hir().get_module(module_def_id);
1828 intravisit::walk_mod(&mut visitor, module, hir_id);
1830 // Check privacy of explicitly written types and traits as well as
1831 // inferred types of expressions and patterns.
1832 let mut visitor = TypePrivacyVisitor {
1834 tables: &empty_tables,
1835 current_item: module_def_id,
1838 empty_tables: &empty_tables,
1840 intravisit::walk_mod(&mut visitor, module, hir_id);
1843 fn privacy_access_levels<'tcx>(
1844 tcx: TyCtxt<'_, 'tcx, 'tcx>,
1846 ) -> &'tcx AccessLevels {
1847 assert_eq!(krate, LOCAL_CRATE);
1849 // Build up a set of all exported items in the AST. This is a set of all
1850 // items which are reachable from external crates based on visibility.
1851 let mut visitor = EmbargoVisitor {
1853 access_levels: Default::default(),
1854 prev_level: Some(AccessLevel::Public),
1858 intravisit::walk_crate(&mut visitor, tcx.hir().krate());
1859 if visitor.changed {
1860 visitor.changed = false;
1865 visitor.update(hir::CRATE_HIR_ID, Some(AccessLevel::Public));
1867 tcx.arena.alloc(visitor.access_levels)
1870 fn check_private_in_public<'tcx>(tcx: TyCtxt<'_, 'tcx, 'tcx>, krate: CrateNum) {
1871 assert_eq!(krate, LOCAL_CRATE);
1873 let access_levels = tcx.privacy_access_levels(LOCAL_CRATE);
1875 let krate = tcx.hir().krate();
1877 let mut visitor = ObsoleteVisiblePrivateTypesVisitor {
1879 access_levels: &access_levels,
1881 old_error_set: Default::default(),
1883 intravisit::walk_crate(&mut visitor, krate);
1885 let has_pub_restricted = {
1886 let mut pub_restricted_visitor = PubRestrictedVisitor {
1888 has_pub_restricted: false
1890 intravisit::walk_crate(&mut pub_restricted_visitor, krate);
1891 pub_restricted_visitor.has_pub_restricted
1894 // Check for private types and traits in public interfaces.
1895 let mut visitor = PrivateItemsInPublicInterfacesVisitor {
1898 old_error_set: &visitor.old_error_set,
1900 krate.visit_all_item_likes(&mut DeepVisitor::new(&mut visitor));
1903 __build_diagnostic_array! { librustc_privacy, DIAGNOSTICS }