diff options
Diffstat (limited to 'compiler/rustc_privacy/src/lib.rs')
| -rw-r--r-- | compiler/rustc_privacy/src/lib.rs | 276 |
1 files changed, 158 insertions, 118 deletions
diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs index d6eb5463870..7b39cb0a068 100644 --- a/compiler/rustc_privacy/src/lib.rs +++ b/compiler/rustc_privacy/src/lib.rs @@ -25,9 +25,9 @@ use rustc_hir::intravisit::{self, Visitor}; use rustc_hir::{AssocItemKind, HirIdSet, ItemId, Node, PatKind}; use rustc_middle::bug; use rustc_middle::hir::nested_filter; -use rustc_middle::middle::privacy::{EffectiveVisibilities, Level}; +use rustc_middle::middle::privacy::{EffectiveVisibilities, EffectiveVisibility, Level}; +use rustc_middle::query::Providers; use rustc_middle::span_bug; -use rustc_middle::ty::query::Providers; use rustc_middle::ty::subst::InternalSubsts; use rustc_middle::ty::{self, Const, GenericParamDefKind}; use rustc_middle::ty::{TraitRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor}; @@ -38,7 +38,7 @@ use rustc_span::Span; use std::marker::PhantomData; use std::ops::ControlFlow; -use std::{cmp, fmt, mem}; +use std::{fmt, mem}; use errors::{ FieldIsPrivate, FieldIsPrivateLabel, FromPrivateDependencyInPublicInterface, InPublicInterface, @@ -408,8 +408,9 @@ impl VisibilityLike for ty::Visibility { min(find.tcx.local_visibility(def_id), find.min, find.tcx) } } -impl VisibilityLike for Option<Level> { - const MAX: Self = Some(Level::Direct); + +impl VisibilityLike for Option<EffectiveVisibility> { + const MAX: Self = Some(EffectiveVisibility::from_vis(ty::Visibility::Public)); // Type inference is very smart sometimes. // It can make an impl reachable even some components of its type or trait are unreachable. // E.g. methods of `impl ReachableTrait<UnreachableTy> for ReachableTy<UnreachableTy> { ... }` @@ -421,7 +422,13 @@ impl VisibilityLike for Option<Level> { // (which require reaching the `DefId`s in them). const SHALLOW: bool = true; fn new_min(find: &FindMin<'_, '_, Self>, def_id: LocalDefId) -> Self { - cmp::min(find.effective_visibilities.public_at_level(def_id), find.min) + if let Some(min) = find.min { + return find + .effective_visibilities + .effective_vis(def_id) + .map(|eff_vis| min.min(*eff_vis, find.tcx)); + } + None } } @@ -447,49 +454,79 @@ struct EmbargoVisitor<'tcx> { /// n::p::f() /// } macro_reachable: FxHashSet<(LocalDefId, LocalDefId)>, - /// Previous visibility level; `None` means unreachable. - prev_level: Option<Level>, /// Has something changed in the level map? changed: bool, } struct ReachEverythingInTheInterfaceVisitor<'a, 'tcx> { - level: Option<Level>, + effective_vis: Option<EffectiveVisibility>, item_def_id: LocalDefId, ev: &'a mut EmbargoVisitor<'tcx>, + level: Level, } impl<'tcx> EmbargoVisitor<'tcx> { - fn get(&self, def_id: LocalDefId) -> Option<Level> { - self.effective_visibilities.public_at_level(def_id) - } - - /// Updates node level and returns the updated level. - fn update(&mut self, def_id: LocalDefId, level: Option<Level>) -> Option<Level> { - let old_level = self.get(def_id); - // Visibility levels can only grow. - if level > old_level { - self.effective_visibilities.set_public_at_level( - def_id, - || ty::Visibility::Restricted(self.tcx.parent_module_from_def_id(def_id)), - level.unwrap(), - ); - self.changed = true; - level - } else { - old_level + fn get(&self, def_id: LocalDefId) -> Option<EffectiveVisibility> { + self.effective_visibilities.effective_vis(def_id).copied() + } + + // Updates node effective visibility. + fn update( + &mut self, + def_id: LocalDefId, + inherited_effective_vis: Option<EffectiveVisibility>, + level: Level, + ) { + let nominal_vis = self.tcx.local_visibility(def_id); + self.update_eff_vis(def_id, inherited_effective_vis, Some(nominal_vis), level); + } + + fn update_eff_vis( + &mut self, + def_id: LocalDefId, + inherited_effective_vis: Option<EffectiveVisibility>, + nominal_vis: Option<ty::Visibility>, + level: Level, + ) { + if let Some(inherited_effective_vis) = inherited_effective_vis { + let private_vis = + ty::Visibility::Restricted(self.tcx.parent_module_from_def_id(def_id)); + if Some(private_vis) != nominal_vis { + self.changed |= self.effective_visibilities.update( + def_id, + nominal_vis, + || private_vis, + inherited_effective_vis, + level, + self.tcx, + ); + } } } fn reach( &mut self, def_id: LocalDefId, - level: Option<Level>, + effective_vis: Option<EffectiveVisibility>, ) -> ReachEverythingInTheInterfaceVisitor<'_, 'tcx> { ReachEverythingInTheInterfaceVisitor { - level: cmp::min(level, Some(Level::Reachable)), + effective_vis, item_def_id: def_id, ev: self, + level: Level::Reachable, + } + } + + fn reach_through_impl_trait( + &mut self, + def_id: LocalDefId, + effective_vis: Option<EffectiveVisibility>, + ) -> ReachEverythingInTheInterfaceVisitor<'_, 'tcx> { + ReachEverythingInTheInterfaceVisitor { + effective_vis, + item_def_id: def_id, + ev: self, + level: Level::ReachableThroughImplTrait, } } @@ -510,16 +547,18 @@ impl<'tcx> EmbargoVisitor<'tcx> { return; } - if self.get(local_def_id).is_none() { + if self.effective_visibilities.public_at_level(local_def_id).is_none() { return; } // Since we are starting from an externally visible module, // all the parents in the loop below are also guaranteed to be modules. let mut module_def_id = macro_module_def_id; + let macro_ev = self.get(local_def_id); + assert!(macro_ev.is_some()); loop { let changed_reachability = - self.update_macro_reachable(module_def_id, macro_module_def_id); + self.update_macro_reachable(module_def_id, macro_module_def_id, macro_ev); if changed_reachability || module_def_id == CRATE_DEF_ID { break; } @@ -533,21 +572,33 @@ impl<'tcx> EmbargoVisitor<'tcx> { &mut self, module_def_id: LocalDefId, defining_mod: LocalDefId, + macro_ev: Option<EffectiveVisibility>, ) -> bool { if self.macro_reachable.insert((module_def_id, defining_mod)) { - self.update_macro_reachable_mod(module_def_id, defining_mod); + self.update_macro_reachable_mod(module_def_id, defining_mod, macro_ev); true } else { false } } - fn update_macro_reachable_mod(&mut self, module_def_id: LocalDefId, defining_mod: LocalDefId) { + fn update_macro_reachable_mod( + &mut self, + module_def_id: LocalDefId, + defining_mod: LocalDefId, + macro_ev: Option<EffectiveVisibility>, + ) { let module = self.tcx.hir().get_module(module_def_id).0; for item_id in module.item_ids { let def_kind = self.tcx.def_kind(item_id.owner_id); let vis = self.tcx.local_visibility(item_id.owner_id.def_id); - self.update_macro_reachable_def(item_id.owner_id.def_id, def_kind, vis, defining_mod); + self.update_macro_reachable_def( + item_id.owner_id.def_id, + def_kind, + vis, + defining_mod, + macro_ev, + ); } for child in self.tcx.module_children_local(module_def_id) { // FIXME: Use module children for the logic above too. @@ -556,7 +607,7 @@ impl<'tcx> EmbargoVisitor<'tcx> { && let Res::Def(def_kind, def_id) = child.res && let Some(def_id) = def_id.as_local() { let vis = self.tcx.local_visibility(def_id); - self.update_macro_reachable_def(def_id, def_kind, vis, defining_mod); + self.update_macro_reachable_def(def_id, def_kind, vis, defining_mod, macro_ev); } } } @@ -567,16 +618,14 @@ impl<'tcx> EmbargoVisitor<'tcx> { def_kind: DefKind, vis: ty::Visibility, module: LocalDefId, + macro_ev: Option<EffectiveVisibility>, ) { - let level = Some(Level::Reachable); - if vis.is_public() { - self.update(def_id, level); - } + self.update(def_id, macro_ev, Level::Reachable); match def_kind { // No type privacy, so can be directly marked as reachable. DefKind::Const | DefKind::Static(_) | DefKind::TraitAlias | DefKind::TyAlias => { if vis.is_accessible_from(module, self.tcx) { - self.update(def_id, level); + self.update(def_id, macro_ev, Level::Reachable); } } @@ -588,7 +637,7 @@ impl<'tcx> EmbargoVisitor<'tcx> { let item = self.tcx.hir().expect_item(def_id); if let hir::ItemKind::Macro(MacroDef { macro_rules: false, .. }, _) = item.kind { if vis.is_accessible_from(module, self.tcx) { - self.update(def_id, level); + self.update(def_id, macro_ev, Level::Reachable); } } } @@ -599,26 +648,24 @@ impl<'tcx> EmbargoVisitor<'tcx> { // the module, however may be reachable. DefKind::Mod => { if vis.is_accessible_from(module, self.tcx) { - self.update_macro_reachable(def_id, module); + self.update_macro_reachable(def_id, module, macro_ev); } } DefKind::Struct | DefKind::Union => { // While structs and unions have type privacy, their fields do not. - if vis.is_public() { - let item = self.tcx.hir().expect_item(def_id); - if let hir::ItemKind::Struct(ref struct_def, _) - | hir::ItemKind::Union(ref struct_def, _) = item.kind - { - for field in struct_def.fields() { - let field_vis = self.tcx.local_visibility(field.def_id); - if field_vis.is_accessible_from(module, self.tcx) { - self.reach(field.def_id, level).ty(); - } + let item = self.tcx.hir().expect_item(def_id); + if let hir::ItemKind::Struct(ref struct_def, _) + | hir::ItemKind::Union(ref struct_def, _) = item.kind + { + for field in struct_def.fields() { + let field_vis = self.tcx.local_visibility(field.def_id); + if field_vis.is_accessible_from(module, self.tcx) { + self.reach(field.def_id, macro_ev).ty(); } - } else { - bug!("item {:?} with DefKind {:?}", item, def_kind); } + } else { + bug!("item {:?} with DefKind {:?}", item, def_kind); } } @@ -662,14 +709,16 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { } fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) { - let item_level = match item.kind { + let item_ev = match item.kind { hir::ItemKind::Impl { .. } => { - let impl_level = Option::<Level>::of_impl( + let impl_ev = Option::<EffectiveVisibility>::of_impl( item.owner_id.def_id, self.tcx, &self.effective_visibilities, ); - self.update(item.owner_id.def_id, impl_level) + + self.update_eff_vis(item.owner_id.def_id, impl_ev, None, Level::Direct); + impl_ev } _ => self.get(item.owner_id.def_id), }; @@ -678,38 +727,35 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { match item.kind { hir::ItemKind::Enum(ref def, _) => { for variant in def.variants { - let variant_level = self.update(variant.def_id, item_level); + self.update(variant.def_id, item_ev, Level::Reachable); + let variant_ev = self.get(variant.def_id); if let Some(ctor_def_id) = variant.data.ctor_def_id() { - self.update(ctor_def_id, item_level); + self.update(ctor_def_id, variant_ev, Level::Reachable); } for field in variant.data.fields() { - self.update(field.def_id, variant_level); + self.update(field.def_id, variant_ev, Level::Reachable); } } } hir::ItemKind::Impl(ref impl_) => { for impl_item_ref in impl_.items { - if impl_.of_trait.is_some() - || self.tcx.visibility(impl_item_ref.id.owner_id).is_public() - { - self.update(impl_item_ref.id.owner_id.def_id, item_level); - } + let def_id = impl_item_ref.id.owner_id.def_id; + let nominal_vis = + impl_.of_trait.is_none().then(|| self.tcx.local_visibility(def_id)); + self.update_eff_vis(def_id, item_ev, nominal_vis, Level::Direct); } } hir::ItemKind::Trait(.., trait_item_refs) => { for trait_item_ref in trait_item_refs { - self.update(trait_item_ref.id.owner_id.def_id, item_level); + self.update(trait_item_ref.id.owner_id.def_id, item_ev, Level::Reachable); } } hir::ItemKind::Struct(ref def, _) | hir::ItemKind::Union(ref def, _) => { if let Some(ctor_def_id) = def.ctor_def_id() { - self.update(ctor_def_id, item_level); + self.update(ctor_def_id, item_ev, Level::Reachable); } for field in def.fields() { - let vis = self.tcx.visibility(field.def_id); - if vis.is_public() { - self.update(field.def_id, item_level); - } + self.update(field.def_id, item_ev, Level::Reachable); } } hir::ItemKind::Macro(ref macro_def, _) => { @@ -717,9 +763,7 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { } hir::ItemKind::ForeignMod { items, .. } => { for foreign_item in items { - if self.tcx.visibility(foreign_item.id.owner_id).is_public() { - self.update(foreign_item.id.owner_id.def_id, item_level); - } + self.update(foreign_item.id.owner_id.def_id, item_ev, Level::Reachable); } } @@ -754,8 +798,11 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { // FIXME: This is some serious pessimization intended to workaround deficiencies // in the reachability pass (`middle/reachable.rs`). Types are marked as link-time // reachable if they are returned via `impl Trait`, even from private functions. - let exist_level = cmp::max(item_level, Some(Level::ReachableThroughImplTrait)); - self.reach(item.owner_id.def_id, exist_level).generics().predicates().ty(); + let exist_ev = Some(EffectiveVisibility::from_vis(ty::Visibility::Public)); + self.reach_through_impl_trait(item.owner_id.def_id, exist_ev) + .generics() + .predicates() + .ty(); } } // Visit everything. @@ -763,17 +810,18 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { | hir::ItemKind::Static(..) | hir::ItemKind::Fn(..) | hir::ItemKind::TyAlias(..) => { - if item_level.is_some() { - self.reach(item.owner_id.def_id, item_level).generics().predicates().ty(); + if item_ev.is_some() { + self.reach(item.owner_id.def_id, item_ev).generics().predicates().ty(); } } hir::ItemKind::Trait(.., trait_item_refs) => { - if item_level.is_some() { - self.reach(item.owner_id.def_id, item_level).generics().predicates(); + if item_ev.is_some() { + self.reach(item.owner_id.def_id, item_ev).generics().predicates(); for trait_item_ref in trait_item_refs { let tcx = self.tcx; - let mut reach = self.reach(trait_item_ref.id.owner_id.def_id, item_level); + let mut reach = self.reach(trait_item_ref.id.owner_id.def_id, item_ev); + reach.generics().predicates(); if trait_item_ref.kind == AssocItemKind::Type @@ -787,23 +835,24 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { } } hir::ItemKind::TraitAlias(..) => { - if item_level.is_some() { - self.reach(item.owner_id.def_id, item_level).generics().predicates(); + if item_ev.is_some() { + self.reach(item.owner_id.def_id, item_ev).generics().predicates(); } } // Visit everything except for private impl items. hir::ItemKind::Impl(ref impl_) => { - if item_level.is_some() { - self.reach(item.owner_id.def_id, item_level) + if item_ev.is_some() { + self.reach(item.owner_id.def_id, item_ev) .generics() .predicates() .ty() .trait_ref(); for impl_item_ref in impl_.items { - let impl_item_level = self.get(impl_item_ref.id.owner_id.def_id); - if impl_item_level.is_some() { - self.reach(impl_item_ref.id.owner_id.def_id, impl_item_level) + let impl_item_ev = self.get(impl_item_ref.id.owner_id.def_id); + + if impl_item_ev.is_some() { + self.reach(impl_item_ref.id.owner_id.def_id, impl_item_ev) .generics() .predicates() .ty(); @@ -814,23 +863,23 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { // Visit everything, but enum variants have their own levels. hir::ItemKind::Enum(ref def, _) => { - if item_level.is_some() { - self.reach(item.owner_id.def_id, item_level).generics().predicates(); + if item_ev.is_some() { + self.reach(item.owner_id.def_id, item_ev).generics().predicates(); } for variant in def.variants { - let variant_level = self.get(variant.def_id); - if variant_level.is_some() { + let variant_ev = self.get(variant.def_id); + if variant_ev.is_some() { for field in variant.data.fields() { - self.reach(field.def_id, variant_level).ty(); + self.reach(field.def_id, variant_ev).ty(); } // Corner case: if the variant is reachable, but its // enum is not, make the enum reachable as well. - self.reach(item.owner_id.def_id, variant_level).ty(); + self.reach(item.owner_id.def_id, variant_ev).ty(); } if let Some(ctor_def_id) = variant.data.ctor_def_id() { - let ctor_level = self.get(ctor_def_id); - if ctor_level.is_some() { - self.reach(item.owner_id.def_id, ctor_level).ty(); + let ctor_ev = self.get(ctor_def_id); + if ctor_ev.is_some() { + self.reach(item.owner_id.def_id, ctor_ev).ty(); } } } @@ -838,9 +887,9 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { // Visit everything, but foreign items have their own levels. hir::ItemKind::ForeignMod { items, .. } => { for foreign_item in items { - let foreign_item_level = self.get(foreign_item.id.owner_id.def_id); - if foreign_item_level.is_some() { - self.reach(foreign_item.id.owner_id.def_id, foreign_item_level) + let foreign_item_ev = self.get(foreign_item.id.owner_id.def_id); + if foreign_item_ev.is_some() { + self.reach(foreign_item.id.owner_id.def_id, foreign_item_ev) .generics() .predicates() .ty(); @@ -849,36 +898,32 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> { } // Visit everything except for private fields. hir::ItemKind::Struct(ref struct_def, _) | hir::ItemKind::Union(ref struct_def, _) => { - if item_level.is_some() { - self.reach(item.owner_id.def_id, item_level).generics().predicates(); + if item_ev.is_some() { + self.reach(item.owner_id.def_id, item_ev).generics().predicates(); for field in struct_def.fields() { - let field_level = self.get(field.def_id); - if field_level.is_some() { - self.reach(field.def_id, field_level).ty(); + let field_ev = self.get(field.def_id); + if field_ev.is_some() { + self.reach(field.def_id, field_ev).ty(); } } } if let Some(ctor_def_id) = struct_def.ctor_def_id() { - let ctor_level = self.get(ctor_def_id); - if ctor_level.is_some() { - self.reach(item.owner_id.def_id, ctor_level).ty(); + let ctor_ev = self.get(ctor_def_id); + if ctor_ev.is_some() { + self.reach(item.owner_id.def_id, ctor_ev).ty(); } } } } - let orig_level = mem::replace(&mut self.prev_level, item_level); intravisit::walk_item(self, item); - self.prev_level = orig_level; } fn visit_block(&mut self, b: &'tcx hir::Block<'tcx>) { // Blocks can have public items, for example impls, but they always // start as completely private regardless of publicity of a function, // constant, type, field, etc., in which this block resides. - let orig_level = mem::replace(&mut self.prev_level, None); intravisit::walk_block(self, b); - self.prev_level = orig_level; } } @@ -932,11 +977,7 @@ impl<'tcx> DefIdVisitor<'tcx> for ReachEverythingInTheInterfaceVisitor<'_, 'tcx> _descr: &dyn fmt::Display, ) -> ControlFlow<Self::BreakTy> { if let Some(def_id) = def_id.as_local() { - if let (ty::Visibility::Public, _) | (_, Some(Level::ReachableThroughImplTrait)) = - (self.tcx().visibility(def_id.to_def_id()), self.level) - { - self.ev.update(def_id, self.level); - } + self.ev.update_eff_vis(def_id, self.effective_vis, None, self.level); } ControlFlow::Continue(()) } @@ -2164,7 +2205,6 @@ fn effective_visibilities(tcx: TyCtxt<'_>, (): ()) -> &EffectiveVisibilities { tcx, effective_visibilities: tcx.resolutions(()).effective_visibilities.clone(), macro_reachable: Default::default(), - prev_level: Some(Level::Direct), changed: false, }; |