Remove crate graph deduplication logic

src/tools/rust-analyzer/crates/base-db/src/input.rs

@@ -491,43 +491,29 @@ impl CrateGraph {
             .for_each(|(_, data)| data.dependencies.sort_by_key(|dep| dep.crate_id));
     }
 
-    /// Extends this crate graph by adding a complete disjoint second crate
+    /// Extends this crate graph by adding a complete second crate
     /// graph and adjust the ids in the [`ProcMacroPaths`] accordingly.
     ///
-    /// This will deduplicate the crates of the graph where possible.
-    /// Note that for deduplication to fully work, `self`'s crate dependencies must be sorted by crate id.
-    /// If the crate dependencies were sorted, the resulting graph from this `extend` call will also
-    /// have the crate dependencies sorted.
-    ///
-    /// Returns a mapping from `other`'s crate ids to the new crate ids in `self`.
+    /// Returns a map mapping `other`'s IDs to the new IDs in `self`.
     pub fn extend(
         &mut self,
         mut other: CrateGraph,
         proc_macros: &mut ProcMacroPaths,
-        merge: impl Fn((CrateId, &mut CrateData), (CrateId, &CrateData)) -> bool,
     ) -> FxHashMap<CrateId, CrateId> {
-        let m = self.len();
         let topo = other.crates_in_topological_order();
         let mut id_map: FxHashMap<CrateId, CrateId> = FxHashMap::default();
         for topo in topo {
             let crate_data = &mut other.arena[topo];
 
             crate_data.dependencies.iter_mut().for_each(|dep| dep.crate_id = id_map[&dep.crate_id]);
             crate_data.dependencies.sort_by_key(|dep| dep.crate_id);
-            let res = self
-                .arena
-                .iter_mut()
-                .take(m)
-                .find_map(|(id, data)| merge((id, data), (topo, crate_data)).then_some(id));
-
-            let new_id =
-                if let Some(res) = res { res } else { self.arena.alloc(crate_data.clone()) };
+
+            let new_id = self.arena.alloc(crate_data.clone());
             id_map.insert(topo, new_id);
         }
 
         *proc_macros =
             mem::take(proc_macros).into_iter().map(|(id, macros)| (id_map[&id], macros)).collect();
-
         id_map
     }
 

src/tools/rust-analyzer/crates/project-model/src/tests.rs

@@ -45,39 +45,6 @@ fn load_cargo_with_overrides(
     to_crate_graph(project_workspace)
 }
 
-fn load_cargo_with_fake_sysroot(
-    file_map: &mut FxHashMap<AbsPathBuf, FileId>,
-    file: &str,
-) -> (CrateGraph, ProcMacroPaths) {
-    let meta: Metadata = get_test_json_file(file);
-    let manifest_path =
-        ManifestPath::try_from(AbsPathBuf::try_from(meta.workspace_root.clone()).unwrap()).unwrap();
-    let cargo_workspace = CargoWorkspace::new(meta, manifest_path);
-    let project_workspace = ProjectWorkspace {
-        kind: ProjectWorkspaceKind::Cargo {
-            cargo: cargo_workspace,
-            build_scripts: WorkspaceBuildScripts::default(),
-            rustc: Err(None),
-            cargo_config_extra_env: Default::default(),
-            error: None,
-        },
-        sysroot: get_fake_sysroot(),
-        rustc_cfg: Vec::new(),
-        cfg_overrides: Default::default(),
-        toolchain: None,
-        target_layout: Err("target_data_layout not loaded".into()),
-    };
-    project_workspace.to_crate_graph(
-        &mut {
-            |path| {
-                let len = file_map.len();
-                Some(*file_map.entry(path.to_path_buf()).or_insert(FileId::from_raw(len as u32)))
-            }
-        },
-        &Default::default(),
-    )
-}
-
 fn load_rust_project(file: &str) -> (CrateGraph, ProcMacroPaths) {
     let data = get_test_json_file(file);
     let project = rooted_project_json(data);
@@ -253,34 +220,6 @@ fn rust_project_is_proc_macro_has_proc_macro_dep() {
     crate_data.dependencies.iter().find(|&dep| dep.name.deref() == "proc_macro").unwrap();
 }
 
-#[test]
-fn crate_graph_dedup_identical() {
-    let (mut crate_graph, proc_macros) =
-        load_cargo_with_fake_sysroot(&mut Default::default(), "regex-metadata.json");
-    crate_graph.sort_deps();
-
-    let (d_crate_graph, mut d_proc_macros) = (crate_graph.clone(), proc_macros.clone());
-
-    crate_graph.extend(d_crate_graph.clone(), &mut d_proc_macros, |(_, a), (_, b)| a == b);
-    assert!(crate_graph.iter().eq(d_crate_graph.iter()));
-    assert_eq!(proc_macros, d_proc_macros);
-}
-
-#[test]
-fn crate_graph_dedup() {
-    let path_map = &mut Default::default();
-    let (mut crate_graph, _proc_macros) =
-        load_cargo_with_fake_sysroot(path_map, "ripgrep-metadata.json");
-    assert_eq!(crate_graph.iter().count(), 81);
-    crate_graph.sort_deps();
-    let (regex_crate_graph, mut regex_proc_macros) =
-        load_cargo_with_fake_sysroot(path_map, "regex-metadata.json");
-    assert_eq!(regex_crate_graph.iter().count(), 60);
-
-    crate_graph.extend(regex_crate_graph, &mut regex_proc_macros, |(_, a), (_, b)| a == b);
-    assert_eq!(crate_graph.iter().count(), 118);
-}
-
 #[test]
 // FIXME Remove the ignore
 #[ignore = "requires nightly until the sysroot ships a cargo workspace for library on stable"]

src/tools/rust-analyzer/crates/project-model/src/workspace.rs

@@ -1456,7 +1456,7 @@ fn sysroot_to_crate_graph(
 
             // Remove all crates except the ones we are interested in to keep the sysroot graph small.
             let removed_mapping = cg.remove_crates_except(&marker_set);
-            let mapping = crate_graph.extend(cg, &mut pm, |(_, a), (_, b)| a == b);
+            let mapping = crate_graph.extend(cg, &mut pm);
 
             // Map the id through the removal mapping first, then through the crate graph extension mapping.
             pub_deps.iter_mut().for_each(|(_, cid, _)| {