Auto merge of rust-lang#14941 - Veykril:def-map, r=Veykril

Shrink `DefMap`, share crate level items with block def maps

Author: bors

crates/hir-def/src/body/lower.rs

@@ -1075,7 +1075,7 @@ impl ExprCollector<'_> {
             match block_id.map(|block_id| (self.db.block_def_map(block_id), block_id)) {
                 Some((def_map, block_id)) => {
                     self.body.block_scopes.push(block_id);
-                    (def_map.module_id(def_map.root()), def_map)
+                    (def_map.module_id(DefMap::ROOT), def_map)
                 }
                 None => (self.expander.module, self.def_map.clone()),
             };

crates/hir-def/src/body/tests/block.rs

@@ -148,8 +148,8 @@ fn f() {
 }
     "#,
         expect![[r#"
-            BlockId(1) in ModuleId { krate: Idx::<CrateData>(0), block: Some(BlockId(0)), local_id: Idx::<ModuleData>(1) }
-            BlockId(0) in ModuleId { krate: Idx::<CrateData>(0), block: None, local_id: Idx::<ModuleData>(0) }
+            BlockId(1) in BlockRelativeModuleId { block: Some(BlockId(0)), local_id: Idx::<ModuleData>(1) }
+            BlockId(0) in BlockRelativeModuleId { block: None, local_id: Idx::<ModuleData>(0) }
             crate scope
         "#]],
     );

crates/hir-def/src/child_by_source.rs

@@ -12,6 +12,7 @@ use crate::{
     db::DefDatabase,
     dyn_map::{keys, DynMap},
     item_scope::ItemScope,
+    nameres::DefMap,
     src::{HasChildSource, HasSource},
     AdtId, AssocItemId, DefWithBodyId, EnumId, EnumVariantId, FieldId, ImplId, Lookup, MacroId,
     ModuleDefId, ModuleId, TraitId, VariantId,
@@ -205,7 +206,7 @@ impl ChildBySource for DefWithBodyId {
         for (_, def_map) in body.blocks(db) {
             // All block expressions are merged into the same map, because they logically all add
             // inner items to the containing `DefWithBodyId`.
-            def_map[def_map.root()].scope.child_by_source_to(db, res, file_id);
+            def_map[DefMap::ROOT].scope.child_by_source_to(db, res, file_id);
         }
     }
 }

crates/hir-def/src/db.rs

@@ -198,15 +198,14 @@ pub trait DefDatabase: InternDatabase + ExpandDatabase + Upcast<dyn ExpandDataba
 
     // endregion:attrs
 
-    #[salsa::invoke(LangItems::crate_lang_items_query)]
-    fn crate_lang_items(&self, krate: CrateId) -> Arc<LangItems>;
-
     #[salsa::invoke(LangItems::lang_item_query)]
     fn lang_item(&self, start_crate: CrateId, item: LangItem) -> Option<LangItemTarget>;
 
     #[salsa::invoke(ImportMap::import_map_query)]
     fn import_map(&self, krate: CrateId) -> Arc<ImportMap>;
 
+    // region:visibilities
+
     #[salsa::invoke(visibility::field_visibilities_query)]
     fn field_visibilities(&self, var: VariantId) -> Arc<ArenaMap<LocalFieldId, Visibility>>;
 
@@ -217,8 +216,14 @@ pub trait DefDatabase: InternDatabase + ExpandDatabase + Upcast<dyn ExpandDataba
     #[salsa::invoke(visibility::const_visibility_query)]
     fn const_visibility(&self, def: ConstId) -> Visibility;
 
+    // endregion:visibilities
+
+    #[salsa::invoke(LangItems::crate_lang_items_query)]
+    fn crate_lang_items(&self, krate: CrateId) -> Arc<LangItems>;
+
     #[salsa::transparent]
     fn crate_limits(&self, crate_id: CrateId) -> CrateLimits;
+
     #[salsa::transparent]
     fn recursion_limit(&self, crate_id: CrateId) -> u32;
 

crates/hir-def/src/find_path.rs

@@ -81,7 +81,7 @@ fn find_path_inner(
     }
 
     let def_map = from.def_map(db);
-    let crate_root = def_map.crate_root(db);
+    let crate_root = def_map.crate_root();
     // - if the item is a module, jump straight to module search
     if let ItemInNs::Types(ModuleDefId::ModuleId(module_id)) = item {
         let mut visited_modules = FxHashSet::default();
@@ -454,7 +454,7 @@ fn find_local_import_locations(
         worklist.push(ancestor);
     }
 
-    let def_map = def_map.crate_root(db).def_map(db);
+    let def_map = def_map.crate_root().def_map(db);
 
     let mut seen: FxHashSet<_> = FxHashSet::default();
 

crates/hir-def/src/import_map.rs

@@ -11,8 +11,8 @@ use rustc_hash::{FxHashSet, FxHasher};
 use triomphe::Arc;
 
 use crate::{
-    db::DefDatabase, item_scope::ItemInNs, visibility::Visibility, AssocItemId, ModuleDefId,
-    ModuleId, TraitId,
+    db::DefDatabase, item_scope::ItemInNs, nameres::DefMap, visibility::Visibility, AssocItemId,
+    ModuleDefId, ModuleId, TraitId,
 };
 
 type FxIndexMap<K, V> = IndexMap<K, V, BuildHasherDefault<FxHasher>>;
@@ -183,7 +183,7 @@ fn collect_import_map(db: &dyn DefDatabase, krate: CrateId) -> ImportMap {
 
     // We look only into modules that are public(ly reexported), starting with the crate root.
     let empty = ImportPath { segments: vec![] };
-    let root = def_map.module_id(def_map.root());
+    let root = def_map.module_id(DefMap::ROOT);
     let mut worklist = vec![(root, empty)];
     while let Some((module, mod_path)) = worklist.pop() {
         let ext_def_map;

crates/hir-def/src/macro_expansion_tests/mod.rs

@@ -35,7 +35,7 @@ use tt::token_id::{Subtree, TokenId};
 use crate::{
     db::DefDatabase,
     macro_id_to_def_id,
-    nameres::{MacroSubNs, ModuleSource},
+    nameres::{DefMap, MacroSubNs, ModuleSource},
     resolver::HasResolver,
     src::HasSource,
     test_db::TestDB,
@@ -61,7 +61,7 @@ pub fn identity_when_valid(_attr: TokenStream, item: TokenStream) -> TokenStream
     let db = TestDB::with_files_extra_proc_macros(ra_fixture, extra_proc_macros);
     let krate = db.crate_graph().iter().next().unwrap();
     let def_map = db.crate_def_map(krate);
-    let local_id = def_map.root();
+    let local_id = DefMap::ROOT;
     let module = def_map.module_id(local_id);
     let resolver = module.resolver(&db);
     let source = def_map[local_id].definition_source(&db);