parent_module_from_def_id does not need to be a query.

Author: cjgillot

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

@@ -735,17 +735,6 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    /// Returns the `OwnerId` of `id`'s nearest module parent, or `id` itself if no
-    /// module parent is in this map.
-    pub(super) fn get_module_parent_node(self, hir_id: HirId) -> OwnerId {
-        for (def_id, node) in self.parent_owner_iter(hir_id) {
-            if let OwnerNode::Item(&Item { kind: ItemKind::Mod(_), .. }) = node {
-                return def_id;
-            }
-        }
-        CRATE_OWNER_ID
-    }
-
     /// When on an if expression, a match arm tail expression or a match arm, give back
     /// the enclosing `if` or `match` expression.
     ///

compiler/rustc_middle/src/hir/mod.rs

@@ -102,7 +102,21 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     pub fn parent_module(self, id: HirId) -> LocalDefId {
-        self.parent_module_from_def_id(id.owner.def_id)
+        if !id.is_owner() && self.def_kind(id.owner) == DefKind::Mod {
+            id.owner.def_id
+        } else {
+            self.parent_module_from_def_id(id.owner.def_id)
+        }
+    }
+
+    pub fn parent_module_from_def_id(self, mut id: LocalDefId) -> LocalDefId {
+        while let Some(parent) = self.opt_local_parent(id) {
+            id = parent;
+            if self.def_kind(id) == DefKind::Mod {
+                break;
+            }
+        }
+        id
     }
 
     pub fn impl_subject(self, def_id: DefId) -> EarlyBinder<ImplSubject<'tcx>> {
@@ -120,10 +134,6 @@ impl<'tcx> TyCtxt<'tcx> {
 }
 
 pub fn provide(providers: &mut Providers) {
-    providers.parent_module_from_def_id = |tcx, id| {
-        let hir = tcx.hir();
-        hir.get_module_parent_node(hir.local_def_id_to_hir_id(id)).def_id
-    };
     providers.hir_crate_items = map::hir_crate_items;
     providers.crate_hash = map::crate_hash;
     providers.hir_module_items = map::hir_module_items;

compiler/rustc_middle/src/query/mod.rs

@@ -398,11 +398,6 @@ rustc_queries! {
         desc { "computing `#[expect]`ed lints in this crate" }
     }
 
-    query parent_module_from_def_id(key: LocalDefId) -> LocalDefId {
-        eval_always
-        desc { |tcx| "getting the parent module of `{}`", tcx.def_path_str(key) }
-    }
-
     query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
         desc { |tcx| "getting the expansion that defined `{}`", tcx.def_path_str(key) }
         separate_provide_extern