Stop interning stability.

compiler/rustc_middle/src/middle/stability.rs

@@ -57,11 +57,11 @@ impl DeprecationEntry {
 
 /// A stability index, giving the stability level for items and methods.
 #[derive(HashStable, Debug)]
-pub struct Index<'tcx> {
+pub struct Index {
     /// This is mostly a cache, except the stabilities of local items
     /// are filled by the annotator.
-    pub stab_map: FxHashMap<LocalDefId, &'tcx Stability>,
-    pub const_stab_map: FxHashMap<LocalDefId, &'tcx ConstStability>,
+    pub stab_map: FxHashMap<LocalDefId, Stability>,
+    pub const_stab_map: FxHashMap<LocalDefId, ConstStability>,
     pub depr_map: FxHashMap<LocalDefId, DeprecationEntry>,
 
     /// Maps for each crate whether it is part of the staged API.
@@ -71,12 +71,12 @@ pub struct Index<'tcx> {
     pub active_features: FxHashSet<Symbol>,
 }
 
-impl<'tcx> Index<'tcx> {
-    pub fn local_stability(&self, def_id: LocalDefId) -> Option<&'tcx Stability> {
+impl Index {
+    pub fn local_stability(&self, def_id: LocalDefId) -> Option<Stability> {
         self.stab_map.get(&def_id).copied()
     }
 
-    pub fn local_const_stability(&self, def_id: LocalDefId) -> Option<&'tcx ConstStability> {
+    pub fn local_const_stability(&self, def_id: LocalDefId) -> Option<ConstStability> {
         self.const_stab_map.get(&def_id).copied()
     }
 
@@ -416,7 +416,7 @@ impl<'tcx> TyCtxt<'tcx> {
         }
 
         match stability {
-            Some(&Stability {
+            Some(Stability {
                 level: attr::Unstable { reason, issue, is_soft }, feature, ..
             }) => {
                 if span.allows_unstable(feature) {

compiler/rustc_middle/src/query/mod.rs

@@ -1010,12 +1010,12 @@ rustc_queries! {
         separate_provide_extern
     }
 
-    query lookup_stability(def_id: DefId) -> Option<&'tcx attr::Stability> {
+    query lookup_stability(def_id: DefId) -> Option<attr::Stability> {
         desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
         separate_provide_extern
     }
 
-    query lookup_const_stability(def_id: DefId) -> Option<&'tcx attr::ConstStability> {
+    query lookup_const_stability(def_id: DefId) -> Option<attr::ConstStability> {
         desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
         separate_provide_extern
     }
@@ -1626,7 +1626,7 @@ rustc_queries! {
         desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
     }
 
-    query stability_index(_: ()) -> stability::Index<'tcx> {
+    query stability_index(_: ()) -> stability::Index {
         storage(ArenaCacheSelector<'tcx>)
         eval_always
         desc { "calculating the stability index for the local crate" }

compiler/rustc_middle/src/ty/context.rs

@@ -24,7 +24,6 @@ use crate::ty::{
     RegionKind, ReprOptions, TraitObjectVisitor, Ty, TyKind, TyS, TyVar, TyVid, TypeAndMut, UintTy,
 };
 use rustc_ast as ast;
-use rustc_attr as attr;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::memmap::Mmap;
@@ -116,12 +115,6 @@ pub struct CtxtInterners<'tcx> {
     bound_variable_kinds: InternedSet<'tcx, List<ty::BoundVariableKind>>,
     layout: InternedSet<'tcx, Layout>,
     adt_def: InternedSet<'tcx, AdtDef>,
-
-    /// `#[stable]` and `#[unstable]` attributes
-    stability: InternedSet<'tcx, attr::Stability>,
-
-    /// `#[rustc_const_stable]` and `#[rustc_const_unstable]` attributes
-    const_stability: InternedSet<'tcx, attr::ConstStability>,
 }
 
 impl<'tcx> CtxtInterners<'tcx> {
@@ -143,8 +136,6 @@ impl<'tcx> CtxtInterners<'tcx> {
             bound_variable_kinds: Default::default(),
             layout: Default::default(),
             adt_def: Default::default(),
-            stability: Default::default(),
-            const_stability: Default::default(),
         }
     }
 
@@ -1271,7 +1262,7 @@ impl<'tcx> TyCtxt<'tcx> {
         self.diagnostic_items(did.krate).name_to_id.get(&name) == Some(&did)
     }
 
-    pub fn stability(self) -> &'tcx stability::Index<'tcx> {
+    pub fn stability(self) -> &'tcx stability::Index {
         self.stability_index(())
     }
 
@@ -1981,12 +1972,6 @@ impl<'tcx> TyCtxt<'tcx> {
 
                 writeln!(fmt, "InternalSubsts interner: #{}", self.0.interners.substs.len())?;
                 writeln!(fmt, "Region interner: #{}", self.0.interners.region.len())?;
-                writeln!(fmt, "Stability interner: #{}", self.0.interners.stability.len())?;
-                writeln!(
-                    fmt,
-                    "Const Stability interner: #{}",
-                    self.0.interners.const_stability.len()
-                )?;
                 writeln!(
                     fmt,
                     "Const Allocation interner: #{}",
@@ -2174,8 +2159,6 @@ direct_interners_old! {
     const_allocation: intern_const_alloc(Allocation),
     layout: intern_layout(Layout),
     adt_def: intern_adt_def(AdtDef),
-    stability: intern_stability(attr::Stability),
-    const_stability: intern_const_stability(attr::ConstStability),
 }
 
 macro_rules! slice_interners {