Auto merge of rust-lang#87568 - petrochenkov:localevel, r=cjgillot

rustc: Replace `HirId`s with `LocalDefId`s in `AccessLevels` tables

and passes using those tables - primarily privacy checking, stability checking and dead code checking.

All these passes work with definitions rather than with arbitrary HIR nodes.
r? `@cjgillot`
cc `@lambinoo` (rust-lang#87487)

Author: bors

compiler/rustc_lint/src/builtin.rs

@@ -38,7 +38,7 @@ use rustc_feature::{deprecated_attributes, AttributeGate, AttributeTemplate, Att
 use rustc_feature::{GateIssue, Stability};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdSet};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdSet, CRATE_DEF_ID};
 use rustc_hir::{ForeignItemKind, GenericParamKind, PatKind};
 use rustc_hir::{HirId, Node};
 use rustc_index::vec::Idx;
@@ -511,7 +511,7 @@ impl MissingDoc {
     fn check_missing_docs_attrs(
         &self,
         cx: &LateContext<'_>,
-        id: hir::HirId,
+        def_id: LocalDefId,
         sp: Span,
         article: &'static str,
         desc: &'static str,
@@ -530,13 +530,13 @@ impl MissingDoc {
         // Only check publicly-visible items, using the result from the privacy pass.
         // It's an option so the crate root can also use this function (it doesn't
         // have a `NodeId`).
-        if id != hir::CRATE_HIR_ID {
-            if !cx.access_levels.is_exported(id) {
+        if def_id != CRATE_DEF_ID {
+            if !cx.access_levels.is_exported(def_id) {
                 return;
             }
         }
 
-        let attrs = cx.tcx.hir().attrs(id);
+        let attrs = cx.tcx.get_attrs(def_id.to_def_id());
         let has_doc = attrs.iter().any(|a| has_doc(cx.sess(), a));
         if !has_doc {
             cx.struct_span_lint(
@@ -568,12 +568,12 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
     }
 
     fn check_crate(&mut self, cx: &LateContext<'_>, krate: &hir::Crate<'_>) {
-        self.check_missing_docs_attrs(cx, hir::CRATE_HIR_ID, krate.module().inner, "the", "crate");
+        self.check_missing_docs_attrs(cx, CRATE_DEF_ID, krate.module().inner, "the", "crate");
 
         for macro_def in krate.exported_macros() {
             // Non exported macros should be skipped, since `missing_docs` only
             // applies to externally visible items.
-            if !cx.access_levels.is_exported(macro_def.hir_id()) {
+            if !cx.access_levels.is_exported(macro_def.def_id) {
                 continue;
             }
 
@@ -632,7 +632,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
 
         let (article, desc) = cx.tcx.article_and_description(it.def_id.to_def_id());
 
-        self.check_missing_docs_attrs(cx, it.hir_id(), it.span, article, desc);
+        self.check_missing_docs_attrs(cx, it.def_id, it.span, article, desc);
     }
 
     fn check_trait_item(&mut self, cx: &LateContext<'_>, trait_item: &hir::TraitItem<'_>) {
@@ -642,7 +642,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
 
         let (article, desc) = cx.tcx.article_and_description(trait_item.def_id.to_def_id());
 
-        self.check_missing_docs_attrs(cx, trait_item.hir_id(), trait_item.span, article, desc);
+        self.check_missing_docs_attrs(cx, trait_item.def_id, trait_item.span, article, desc);
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {
@@ -652,22 +652,23 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
         }
 
         let (article, desc) = cx.tcx.article_and_description(impl_item.def_id.to_def_id());
-        self.check_missing_docs_attrs(cx, impl_item.hir_id(), impl_item.span, article, desc);
+        self.check_missing_docs_attrs(cx, impl_item.def_id, impl_item.span, article, desc);
     }
 
     fn check_foreign_item(&mut self, cx: &LateContext<'_>, foreign_item: &hir::ForeignItem<'_>) {
         let (article, desc) = cx.tcx.article_and_description(foreign_item.def_id.to_def_id());
-        self.check_missing_docs_attrs(cx, foreign_item.hir_id(), foreign_item.span, article, desc);
+        self.check_missing_docs_attrs(cx, foreign_item.def_id, foreign_item.span, article, desc);
     }
 
     fn check_field_def(&mut self, cx: &LateContext<'_>, sf: &hir::FieldDef<'_>) {
         if !sf.is_positional() {
-            self.check_missing_docs_attrs(cx, sf.hir_id, sf.span, "a", "struct field")
+            let def_id = cx.tcx.hir().local_def_id(sf.hir_id);
+            self.check_missing_docs_attrs(cx, def_id, sf.span, "a", "struct field")
         }
     }
 
     fn check_variant(&mut self, cx: &LateContext<'_>, v: &hir::Variant<'_>) {
-        self.check_missing_docs_attrs(cx, v.id, v.span, "a", "variant");
+        self.check_missing_docs_attrs(cx, cx.tcx.hir().local_def_id(v.id), v.span, "a", "variant");
     }
 }
 
@@ -709,7 +710,7 @@ declare_lint_pass!(MissingCopyImplementations => [MISSING_COPY_IMPLEMENTATIONS])
 
 impl<'tcx> LateLintPass<'tcx> for MissingCopyImplementations {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
-        if !cx.access_levels.is_reachable(item.hir_id()) {
+        if !cx.access_levels.is_reachable(item.def_id) {
             return;
         }
         let (def, ty) = match item.kind {
@@ -796,7 +797,7 @@ impl_lint_pass!(MissingDebugImplementations => [MISSING_DEBUG_IMPLEMENTATIONS]);
 
 impl<'tcx> LateLintPass<'tcx> for MissingDebugImplementations {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
-        if !cx.access_levels.is_reachable(item.hir_id()) {
+        if !cx.access_levels.is_reachable(item.def_id) {
             return;
         }
 
@@ -1314,14 +1315,14 @@ impl UnreachablePub {
         &self,
         cx: &LateContext<'_>,
         what: &str,
-        id: hir::HirId,
+        def_id: LocalDefId,
         vis: &hir::Visibility<'_>,
         span: Span,
         exportable: bool,
     ) {
         let mut applicability = Applicability::MachineApplicable;
         match vis.node {
-            hir::VisibilityKind::Public if !cx.access_levels.is_reachable(id) => {
+            hir::VisibilityKind::Public if !cx.access_levels.is_reachable(def_id) => {
                 if span.from_expansion() {
                     applicability = Applicability::MaybeIncorrect;
                 }
@@ -1354,26 +1355,27 @@ impl UnreachablePub {
 
 impl<'tcx> LateLintPass<'tcx> for UnreachablePub {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
-        self.perform_lint(cx, "item", item.hir_id(), &item.vis, item.span, true);
+        self.perform_lint(cx, "item", item.def_id, &item.vis, item.span, true);
     }
 
     fn check_foreign_item(&mut self, cx: &LateContext<'_>, foreign_item: &hir::ForeignItem<'tcx>) {
         self.perform_lint(
             cx,
             "item",
-            foreign_item.hir_id(),
+            foreign_item.def_id,
             &foreign_item.vis,
             foreign_item.span,
             true,
         );
     }
 
     fn check_field_def(&mut self, cx: &LateContext<'_>, field: &hir::FieldDef<'_>) {
-        self.perform_lint(cx, "field", field.hir_id, &field.vis, field.span, false);
+        let def_id = cx.tcx.hir().local_def_id(field.hir_id);
+        self.perform_lint(cx, "field", def_id, &field.vis, field.span, false);
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {
-        self.perform_lint(cx, "item", impl_item.hir_id(), &impl_item.vis, impl_item.span, false);
+        self.perform_lint(cx, "item", impl_item.def_id, &impl_item.vis, impl_item.span, false);
     }
 }
 

compiler/rustc_middle/src/hir/map/mod.rs

@@ -581,14 +581,6 @@ impl<'hir> Map<'hir> {
         self.body_const_context(self.local_def_id(self.enclosing_body_owner(hir_id))).is_some()
     }
 
-    /// Whether `hir_id` corresponds to a `mod` or a crate.
-    pub fn is_hir_id_module(&self, hir_id: HirId) -> bool {
-        matches!(
-            self.get(hir_id),
-            Node::Item(Item { kind: ItemKind::Mod(_), .. }) | Node::Crate(..)
-        )
-    }
-
     /// Retrieves the `HirId` for `id`'s enclosing method, unless there's a
     /// `while` or `loop` before reaching it, as block tail returns are not
     /// available in them.

compiler/rustc_middle/src/middle/privacy.rs

@@ -3,9 +3,8 @@
 //! which are available for use externally when compiled as a library.
 
 use rustc_data_structures::fx::FxHashMap;
-use rustc_hir::HirId;
 use rustc_macros::HashStable;
-use std::fmt;
+use rustc_span::def_id::LocalDefId;
 use std::hash::Hash;
 
 /// Represents the levels of accessibility an item can have.
@@ -27,8 +26,8 @@ pub enum AccessLevel {
 }
 
 /// Holds a map of accessibility levels for reachable HIR nodes.
-#[derive(Clone)]
-pub struct AccessLevels<Id = HirId> {
+#[derive(Debug)]
+pub struct AccessLevels<Id = LocalDefId> {
     pub map: FxHashMap<Id, AccessLevel>,
 }
 
@@ -49,14 +48,8 @@ impl<Id: Hash + Eq> AccessLevels<Id> {
     }
 }
 
-impl<Id: Hash + Eq> Default for AccessLevels<Id> {
+impl<Id> Default for AccessLevels<Id> {
     fn default() -> Self {
         AccessLevels { map: Default::default() }
     }
 }
-
-impl<Id: Hash + Eq + fmt::Debug> fmt::Debug for AccessLevels<Id> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Debug::fmt(&self.map, f)
-    }
-}

compiler/rustc_middle/src/middle/stability.rs

@@ -11,7 +11,7 @@ use rustc_errors::{Applicability, DiagnosticBuilder};
 use rustc_feature::GateIssue;
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::{CrateNum, DefId, CRATE_DEF_INDEX};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_INDEX};
 use rustc_hir::{self, HirId};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_session::lint::builtin::{DEPRECATED, DEPRECATED_IN_FUTURE, SOFT_UNSTABLE};
@@ -36,12 +36,12 @@ pub struct DeprecationEntry {
     pub attr: Deprecation,
     /// The `DefId` where the attr was originally attached. `None` for non-local
     /// `DefId`'s.
-    origin: Option<HirId>,
+    origin: Option<LocalDefId>,
 }
 
 impl DeprecationEntry {
-    pub fn local(attr: Deprecation, id: HirId) -> DeprecationEntry {
-        DeprecationEntry { attr, origin: Some(id) }
+    pub fn local(attr: Deprecation, def_id: LocalDefId) -> DeprecationEntry {
+        DeprecationEntry { attr, origin: Some(def_id) }
     }
 
     pub fn external(attr: Deprecation) -> DeprecationEntry {
@@ -61,9 +61,9 @@ impl DeprecationEntry {
 pub struct Index<'tcx> {
     /// This is mostly a cache, except the stabilities of local items
     /// are filled by the annotator.
-    pub stab_map: FxHashMap<HirId, &'tcx Stability>,
-    pub const_stab_map: FxHashMap<HirId, &'tcx ConstStability>,
-    pub depr_map: FxHashMap<HirId, DeprecationEntry>,
+    pub stab_map: FxHashMap<LocalDefId, &'tcx Stability>,
+    pub const_stab_map: FxHashMap<LocalDefId, &'tcx ConstStability>,
+    pub depr_map: FxHashMap<LocalDefId, DeprecationEntry>,
 
     /// Maps for each crate whether it is part of the staged API.
     pub staged_api: FxHashMap<CrateNum, bool>,
@@ -73,16 +73,16 @@ pub struct Index<'tcx> {
 }
 
 impl<'tcx> Index<'tcx> {
-    pub fn local_stability(&self, id: HirId) -> Option<&'tcx Stability> {
-        self.stab_map.get(&id).cloned()
+    pub fn local_stability(&self, def_id: LocalDefId) -> Option<&'tcx Stability> {
+        self.stab_map.get(&def_id).copied()
     }
 
-    pub fn local_const_stability(&self, id: HirId) -> Option<&'tcx ConstStability> {
-        self.const_stab_map.get(&id).cloned()
+    pub fn local_const_stability(&self, def_id: LocalDefId) -> Option<&'tcx ConstStability> {
+        self.const_stab_map.get(&def_id).copied()
     }
 
-    pub fn local_deprecation_entry(&self, id: HirId) -> Option<DeprecationEntry> {
-        self.depr_map.get(&id).cloned()
+    pub fn local_deprecation_entry(&self, def_id: LocalDefId) -> Option<DeprecationEntry> {
+        self.depr_map.get(&def_id).cloned()
     }
 }
 

compiler/rustc_middle/src/ty/context.rs

@@ -2854,18 +2854,11 @@ pub fn provide(providers: &mut ty::query::Providers) {
         tcx.arena.alloc(tcx.resolutions(()).glob_map.get(&id).cloned().unwrap_or_default())
     };
 
-    providers.lookup_stability = |tcx, id| {
-        let id = tcx.hir().local_def_id_to_hir_id(id.expect_local());
-        tcx.stability().local_stability(id)
-    };
-    providers.lookup_const_stability = |tcx, id| {
-        let id = tcx.hir().local_def_id_to_hir_id(id.expect_local());
-        tcx.stability().local_const_stability(id)
-    };
-    providers.lookup_deprecation_entry = |tcx, id| {
-        let id = tcx.hir().local_def_id_to_hir_id(id.expect_local());
-        tcx.stability().local_deprecation_entry(id)
-    };
+    providers.lookup_stability = |tcx, id| tcx.stability().local_stability(id.expect_local());
+    providers.lookup_const_stability =
+        |tcx, id| tcx.stability().local_const_stability(id.expect_local());
+    providers.lookup_deprecation_entry =
+        |tcx, id| tcx.stability().local_deprecation_entry(id.expect_local());
     providers.extern_mod_stmt_cnum =
         |tcx, id| tcx.resolutions(()).extern_crate_map.get(&id).cloned();
     providers.output_filenames = |tcx, ()| tcx.output_filenames.clone();