Remove HirId -> LocalDefId map from HIR.

Author: cjgillot

compiler/rustc_ast_lowering/src/item.rs

@@ -67,7 +67,6 @@ impl<'a, 'hir> ItemLowerer<'a, 'hir> {
             current_hir_id_owner: hir::CRATE_OWNER_ID,
             item_local_id_counter: hir::ItemLocalId::new(0),
             node_id_to_local_id: Default::default(),
-            local_id_to_def_id: SortedMap::new(),
             trait_map: Default::default(),
 
             // Lowering state.

compiler/rustc_ast_lowering/src/lib.rs

@@ -119,7 +119,6 @@ struct LoweringContext<'a, 'hir> {
 
     current_hir_id_owner: hir::OwnerId,
     item_local_id_counter: hir::ItemLocalId,
-    local_id_to_def_id: SortedMap<ItemLocalId, LocalDefId>,
     trait_map: FxHashMap<ItemLocalId, Box<[TraitCandidate]>>,
 
     impl_trait_defs: Vec<hir::GenericParam<'hir>>,
@@ -567,7 +566,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let current_attrs = std::mem::take(&mut self.attrs);
         let current_bodies = std::mem::take(&mut self.bodies);
         let current_node_ids = std::mem::take(&mut self.node_id_to_local_id);
-        let current_id_to_def_id = std::mem::take(&mut self.local_id_to_def_id);
         let current_trait_map = std::mem::take(&mut self.trait_map);
         let current_owner =
             std::mem::replace(&mut self.current_hir_id_owner, hir::OwnerId { def_id });
@@ -594,7 +592,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         self.attrs = current_attrs;
         self.bodies = current_bodies;
         self.node_id_to_local_id = current_node_ids;
-        self.local_id_to_def_id = current_id_to_def_id;
         self.trait_map = current_trait_map;
         self.current_hir_id_owner = current_owner;
         self.item_local_id_counter = current_local_counter;
@@ -629,7 +626,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     fn make_owner_info(&mut self, node: hir::OwnerNode<'hir>) -> &'hir hir::OwnerInfo<'hir> {
         let attrs = std::mem::take(&mut self.attrs);
         let mut bodies = std::mem::take(&mut self.bodies);
-        let local_id_to_def_id = std::mem::take(&mut self.local_id_to_def_id);
         let trait_map = std::mem::take(&mut self.trait_map);
 
         #[cfg(debug_assertions)]
@@ -645,13 +641,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let (hash_including_bodies, hash_without_bodies) = self.hash_owner(node, &bodies);
         let (nodes, parenting) =
             index::index_hir(self.tcx.sess, &*self.tcx.definitions_untracked(), node, &bodies);
-        let nodes = hir::OwnerNodes {
-            hash_including_bodies,
-            hash_without_bodies,
-            nodes,
-            bodies,
-            local_id_to_def_id,
-        };
+        let nodes = hir::OwnerNodes { hash_including_bodies, hash_without_bodies, nodes, bodies };
         let attrs = {
             let hash = self.tcx.with_stable_hashing_context(|mut hcx| {
                 let mut stable_hasher = StableHasher::new();
@@ -710,7 +700,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 assert_ne!(local_id, hir::ItemLocalId::new(0));
                 if let Some(def_id) = self.opt_local_def_id(ast_node_id) {
                     self.children.push((def_id, hir::MaybeOwner::NonOwner(hir_id)));
-                    self.local_id_to_def_id.insert(local_id, def_id);
                 }
 
                 if let Some(traits) = self.resolver.trait_map.remove(&ast_node_id) {

compiler/rustc_hir/src/hir.rs

@@ -831,8 +831,6 @@ pub struct OwnerNodes<'tcx> {
     pub nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,
     /// Content of local bodies.
     pub bodies: SortedMap<ItemLocalId, &'tcx Body<'tcx>>,
-    /// Non-owning definitions contained in this owner.
-    pub local_id_to_def_id: SortedMap<ItemLocalId, LocalDefId>,
 }
 
 impl<'tcx> OwnerNodes<'tcx> {
@@ -862,7 +860,6 @@ impl fmt::Debug for OwnerNodes<'_> {
                     .collect::<Vec<_>>(),
             )
             .field("bodies", &self.bodies)
-            .field("local_id_to_def_id", &self.local_id_to_def_id)
             .field("hash_without_bodies", &self.hash_without_bodies)
             .field("hash_including_bodies", &self.hash_including_bodies)
             .finish()

compiler/rustc_hir/src/stable_hash_impls.rs

@@ -100,13 +100,8 @@ impl<'tcx, HirCtx: crate::HashStableContext> HashStable<HirCtx> for OwnerNodes<'
         // `local_id_to_def_id` is also ignored because is dependent on the body, then just hashing
         // the body satisfies the condition of two nodes being different have different
         // `hash_stable` results.
-        let OwnerNodes {
-            hash_including_bodies,
-            hash_without_bodies: _,
-            nodes: _,
-            bodies: _,
-            local_id_to_def_id: _,
-        } = *self;
+        let OwnerNodes { hash_including_bodies, hash_without_bodies: _, nodes: _, bodies: _ } =
+            *self;
         hash_including_bodies.hash_stable(hcx, hasher);
     }
 }

compiler/rustc_hir_analysis/src/check/check.rs

@@ -665,7 +665,7 @@ fn check_item_type(tcx: TyCtxt<'_>, id: hir::ItemId) {
         DefKind::GlobalAsm => {
             let it = tcx.hir().item(id);
             let hir::ItemKind::GlobalAsm(asm) = it.kind else { span_bug!(it.span, "DefKind::GlobalAsm but got {:#?}", it) };
-            InlineAsmCtxt::new_global_asm(tcx).check_asm(asm, id.hir_id());
+            InlineAsmCtxt::new_global_asm(tcx).check_asm(asm, id.owner_id.def_id);
         }
         _ => {}
     }

compiler/rustc_hir_analysis/src/check/intrinsicck.rs

@@ -3,6 +3,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir as hir;
 use rustc_middle::ty::{self, Article, FloatTy, IntTy, Ty, TyCtxt, TypeVisitable, UintTy};
 use rustc_session::lint;
+use rustc_span::def_id::LocalDefId;
 use rustc_span::{Symbol, DUMMY_SP};
 use rustc_target::asm::{InlineAsmReg, InlineAsmRegClass, InlineAsmRegOrRegClass, InlineAsmType};
 
@@ -253,10 +254,8 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
         Some(asm_ty)
     }
 
-    pub fn check_asm(&self, asm: &hir::InlineAsm<'tcx>, enclosing_id: hir::HirId) {
-        let hir = self.tcx.hir();
-        let enclosing_def_id = hir.local_def_id(enclosing_id).to_def_id();
-        let target_features = self.tcx.asm_target_features(enclosing_def_id);
+    pub fn check_asm(&self, asm: &hir::InlineAsm<'tcx>, enclosing_id: LocalDefId) {
+        let target_features = self.tcx.asm_target_features(enclosing_id.to_def_id());
         let Some(asm_arch) = self.tcx.sess.asm_arch else {
             self.tcx.sess.delay_span_bug(DUMMY_SP, "target architecture does not support asm");
             return;

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -391,7 +391,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
                         gather_gat_bounds(
                             tcx,
                             param_env,
-                            item_def_id.def_id,
+                            item_def_id,
                             sig.inputs_and_output,
                             // We also assume that all of the function signature's parameter types
                             // are well formed.
@@ -413,7 +413,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
                         gather_gat_bounds(
                             tcx,
                             param_env,
-                            item_def_id.def_id,
+                            item_def_id,
                             tcx.explicit_item_bounds(item_def_id).to_vec(),
                             &FxIndexSet::default(),
                             gat_def_id.def_id,
@@ -563,7 +563,7 @@ fn augment_param_env<'tcx>(
 fn gather_gat_bounds<'tcx, T: TypeFoldable<'tcx>>(
     tcx: TyCtxt<'tcx>,
     param_env: ty::ParamEnv<'tcx>,
-    item_def_id: LocalDefId,
+    item_def_id: hir::OwnerId,
     to_check: T,
     wf_tys: &FxIndexSet<Ty<'tcx>>,
     gat_def_id: LocalDefId,
@@ -596,7 +596,7 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<'tcx>>(
         // reflected in a where clause on the GAT itself.
         for (ty, ty_idx) in &types {
             // In our example, requires that `Self: 'a`
-            if ty_known_to_outlive(tcx, item_def_id, param_env, &wf_tys, *ty, *region_a) {
+            if ty_known_to_outlive(tcx, item_def_id.def_id, param_env, &wf_tys, *ty, *region_a) {
                 debug!(?ty_idx, ?region_a_idx);
                 debug!("required clause: {ty} must outlive {region_a}");
                 // Translate into the generic parameters of the GAT. In
@@ -634,7 +634,14 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<'tcx>>(
             if ty::ReStatic == **region_b || region_a == region_b {
                 continue;
             }
-            if region_known_to_outlive(tcx, item_def_id, param_env, &wf_tys, *region_a, *region_b) {
+            if region_known_to_outlive(
+                tcx,
+                item_def_id.def_id,
+                param_env,
+                &wf_tys,
+                *region_a,
+                *region_b,
+            ) {
                 debug!(?region_a_idx, ?region_b_idx);
                 debug!("required clause: {region_a} must outlive {region_b}");
                 // Translate into the generic parameters of the GAT.

compiler/rustc_hir_analysis/src/collect/lifetimes.rs

@@ -1264,14 +1264,21 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
             } else if let Some(body_id) = outermost_body {
                 let fn_id = self.tcx.hir().body_owner(body_id);
                 match self.tcx.hir().get(fn_id) {
-                    Node::Item(hir::Item { kind: hir::ItemKind::Fn(..), .. })
+                    Node::Item(hir::Item { owner_id, kind: hir::ItemKind::Fn(..), .. })
                     | Node::TraitItem(hir::TraitItem {
-                        kind: hir::TraitItemKind::Fn(..), ..
+                        owner_id,
+                        kind: hir::TraitItemKind::Fn(..),
+                        ..
                     })
-                    | Node::ImplItem(hir::ImplItem { kind: hir::ImplItemKind::Fn(..), .. })
-                    | Node::Expr(hir::Expr { kind: hir::ExprKind::Closure(..), .. }) => {
-                        let scope = self.tcx.hir().local_def_id(fn_id);
-                        def = Region::Free(scope.to_def_id(), def.id().unwrap());
+                    | Node::ImplItem(hir::ImplItem {
+                        owner_id,
+                        kind: hir::ImplItemKind::Fn(..),
+                        ..
+                    }) => {
+                        def = Region::Free(owner_id.to_def_id(), def.id().unwrap());
+                    }
+                    Node::Expr(hir::Expr { kind: hir::ExprKind::Closure(closure), .. }) => {
+                        def = Region::Free(closure.def_id.to_def_id(), def.id().unwrap());
                     }
                     _ => {}
                 }
@@ -1658,10 +1665,12 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
 /// "Constrained" basically means that it appears in any type but
 /// not amongst the inputs to a projection. In other words, `<&'a
 /// T as Trait<''b>>::Foo` does not constrain `'a` or `'b`.
-fn is_late_bound_map(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<&FxIndexSet<LocalDefId>> {
-    let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
-    let decl = tcx.hir().fn_decl_by_hir_id(hir_id)?;
-    let generics = tcx.hir().get_generics(def_id)?;
+fn is_late_bound_map(
+    tcx: TyCtxt<'_>,
+    owner_id: hir::OwnerId,
+) -> Option<&FxIndexSet<hir::ItemLocalId>> {
+    let decl = tcx.hir().fn_decl_by_hir_id(owner_id.into())?;
+    let generics = tcx.hir().get_generics(owner_id.def_id)?;
 
     let mut late_bound = FxIndexSet::default();
 
@@ -1695,24 +1704,22 @@ fn is_late_bound_map(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<&FxIndexSet<
             hir::GenericParamKind::Type { .. } | hir::GenericParamKind::Const { .. } => continue,
         }
 
-        let param_def_id = tcx.hir().local_def_id(param.hir_id);
-
         // appears in the where clauses? early-bound.
-        if appears_in_where_clause.regions.contains(&param_def_id) {
+        if appears_in_where_clause.regions.contains(&param.def_id) {
             continue;
         }
 
         // does not appear in the inputs, but appears in the return type? early-bound.
-        if !constrained_by_input.regions.contains(&param_def_id)
-            && appears_in_output.regions.contains(&param_def_id)
+        if !constrained_by_input.regions.contains(&param.def_id)
+            && appears_in_output.regions.contains(&param.def_id)
         {
             continue;
         }
 
-        debug!("lifetime {:?} with id {:?} is late-bound", param.name.ident(), param.hir_id);
+        debug!("lifetime {:?} with id {:?} is late-bound", param.name.ident(), param.def_id);
 
-        let inserted = late_bound.insert(param_def_id);
-        assert!(inserted, "visited lifetime {:?} twice", param.hir_id);
+        let inserted = late_bound.insert(param.hir_id.local_id);
+        assert!(inserted, "visited lifetime {:?} twice", param.def_id);
     }
 
     debug!(?late_bound);

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -280,7 +280,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericP
             }
 
             let hir::GenericParamKind::Lifetime { .. } = duplicate.kind else { continue };
-            let dup_def = tcx.hir().local_def_id(duplicate.hir_id).to_def_id();
+            let dup_def = duplicate.def_id.to_def_id();
 
             let Some(dup_index) = generics.param_def_id_to_index(tcx, dup_def) else { bug!() };
 

compiler/rustc_hir_analysis/src/collect/type_of.rs

@@ -54,15 +54,14 @@ pub(super) fn opt_const_param_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<
             // ty which is a fully resolved projection.
             // For the code example above, this would mean converting Self::Assoc<3>
             // into a ty::Alias(ty::Projection, <Self as Foo>::Assoc<3>)
-            let item_hir_id = tcx
+            let item_def_id = tcx
                 .hir()
-                .parent_iter(hir_id)
-                .filter(|(_, node)| matches!(node, Node::Item(_)))
-                .map(|(id, _)| id)
-                .next()
-                .unwrap();
-            let item_did = tcx.hir().local_def_id(item_hir_id).to_def_id();
-            let item_ctxt = &ItemCtxt::new(tcx, item_did) as &dyn crate::astconv::AstConv<'_>;
+                .parent_owner_iter(hir_id)
+                .find(|(_, node)| matches!(node, OwnerNode::Item(_)))
+                .unwrap()
+                .0
+                .to_def_id();
+            let item_ctxt = &ItemCtxt::new(tcx, item_def_id) as &dyn crate::astconv::AstConv<'_>;
             let ty = item_ctxt.ast_ty_to_ty(hir_ty);
 
             // Iterate through the generics of the projection to find the one that corresponds to