Auto merge of #16101 - Veykril:search-depedencies-fix, r=Veykril

fix: Fix `import_map::search_dependencies` getting confused by assoc and non assoc items with the same name

No test case as creating one is kind of tricky... Ideally the code should be restructured such that this collision wouldn't matter in the first place, its kind of a mess.

Fixes https://github.com/rust-lang/rust-analyzer/issues/16074
Fixes https://github.com/rust-lang/rust-analyzer/issues/16080
Fixes https://github.com/rust-lang/rust-analyzer/issues/15845

crates/hir-def/src/import_map.rs

@@ -9,6 +9,7 @@ use indexmap::IndexMap;
 use itertools::Itertools;
 use rustc_hash::{FxHashSet, FxHasher};
 use smallvec::SmallVec;
+use stdx::format_to;
 use triomphe::Arc;
 
 use crate::{
@@ -53,13 +54,25 @@ pub struct ImportMap {
     fst: fst::Map<Vec<u8>>,
 }
 
-#[derive(Copy, Clone, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Ord, PartialOrd)]
 enum IsTraitAssocItem {
     Yes,
     No,
 }
 
 impl ImportMap {
+    pub fn dump(&self, db: &dyn DefDatabase) -> String {
+        let mut out = String::new();
+        for (k, v) in self.map.iter() {
+            format_to!(out, "{:?} ({:?}) -> ", k, v.1);
+            for v in &v.0 {
+                format_to!(out, "{}:{:?}, ", v.name.display(db.upcast()), v.container);
+            }
+            format_to!(out, "\n");
+        }
+        out
+    }
+
     pub(crate) fn import_map_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<Self> {
         let _p = profile::span("import_map_query");
 
@@ -68,26 +81,31 @@ impl ImportMap {
         let mut importables: Vec<_> = map
             .iter()
             // We've only collected items, whose name cannot be tuple field.
-            .flat_map(|(&item, (info, _))| {
+            .flat_map(|(&item, (info, is_assoc))| {
-                info.iter()
+                info.iter().map(move |info| {
-                    .map(move |info| (item, info.name.as_str().unwrap().to_ascii_lowercase()))
+                    (item, *is_assoc, info.name.as_str().unwrap().to_ascii_lowercase())
+                })
             })
             .collect();
-        importables.sort_by(|(_, lhs_name), (_, rhs_name)| lhs_name.cmp(rhs_name));
+        importables.sort_by(|(_, l_is_assoc, lhs_name), (_, r_is_assoc, rhs_name)| {
+            lhs_name.cmp(rhs_name).then_with(|| l_is_assoc.cmp(r_is_assoc))
+        });
         importables.dedup();
 
         // Build the FST, taking care not to insert duplicate values.
         let mut builder = fst::MapBuilder::memory();
-        let iter =
+        let iter = importables
-            importables.iter().enumerate().dedup_by(|(_, (_, lhs)), (_, (_, rhs))| lhs == rhs);
+            .iter()
-        for (start_idx, (_, name)) in iter {
+            .enumerate()
+            .dedup_by(|(_, (_, _, lhs)), (_, (_, _, rhs))| lhs == rhs);
+        for (start_idx, (_, _, name)) in iter {
             let _ = builder.insert(name, start_idx as u64);
         }
 
         Arc::new(ImportMap {
             map,
             fst: builder.into_map(),
-            importables: importables.into_iter().map(|(item, _)| item).collect(),
+            importables: importables.into_iter().map(|(item, _, _)| item).collect(),
         })
     }
 
@@ -332,20 +350,20 @@ impl Query {
     }
 
     /// Checks whether the import map entry matches the query.
-    fn import_matches(
+    fn import_matches(&self, import: &ImportInfo, enforce_lowercase: bool) -> bool {
-        &self,
-        db: &dyn DefDatabase,
-        import: &ImportInfo,
-        enforce_lowercase: bool,
-    ) -> bool {
         let _p = profile::span("import_map::Query::import_matches");
 
         // FIXME: Can we get rid of the alloc here?
-        let mut input = import.name.display(db.upcast()).to_string();
+        let input = import.name.to_smol_str();
+        let mut _s_slot;
         let case_insensitive = enforce_lowercase || !self.case_sensitive;
-        if case_insensitive {
+        let input = if case_insensitive {
-            input.make_ascii_lowercase();
+            _s_slot = String::from(input);
-        }
+            _s_slot.make_ascii_lowercase();
+            &*_s_slot
+        } else {
+            &*input
+        };
 
         let query_string = if case_insensitive { &self.lowercased } else { &self.query };
 
@@ -355,7 +373,7 @@ impl Query {
             SearchMode::Fuzzy => {
                 let mut input_chars = input.chars();
                 for query_char in query_string.chars() {
-                    if input_chars.find(|&it| it == query_char).is_none() {
+                    if !input_chars.any(|it| it == query_char) {
                         return false;
                     }
                 }
@@ -376,6 +394,7 @@ pub fn search_dependencies(
     let _p = profile::span("search_dependencies").detail(|| format!("{query:?}"));
 
     let graph = db.crate_graph();
+
     let import_maps: Vec<_> =
         graph[krate].dependencies.iter().map(|dep| db.import_map(dep.crate_id)).collect();
 
@@ -390,22 +409,28 @@ pub fn search_dependencies(
 
     let mut res = FxHashSet::default();
     let mut common_importable_data_scratch = vec![];
+    // FIXME: Improve this, its rather unreadable and does duplicate amount of work
     while let Some((_, indexed_values)) = stream.next() {
         for &IndexedValue { index, value } in indexed_values {
             let import_map = &import_maps[index];
-            let importables @ [importable, ..] = &import_map.importables[value as usize..] else {
+            let importables = &import_map.importables[value as usize..];
+
+            // Find the first item in this group that has a matching assoc mode and slice the rest away
+            let Some(importable) =
+                importables.iter().position(|it| query.matches_assoc_mode(import_map.map[it].1))
+            else {
+                continue;
+            };
+            let importables @ [importable, ..] = &importables[importable..] else {
                 continue;
             };
 
-            let &(ref importable_data, is_trait_assoc_item) = &import_map.map[importable];
+            // Fetch all the known names of this importable item (to handle import aliases/renames)
-            if !query.matches_assoc_mode(is_trait_assoc_item) {
-                continue;
-            }
-
             common_importable_data_scratch.extend(
-                importable_data
+                import_map.map[importable]
+                    .0
                     .iter()
-                    .filter(|&info| query.import_matches(db, info, true))
+                    .filter(|&info| query.import_matches(info, true))
                     // Name shared by the importable items in this group.
                     .map(|info| info.name.to_smol_str()),
             );
@@ -419,6 +444,7 @@ pub fn search_dependencies(
                 common_importable_data_scratch.drain(..).flat_map(|common_importable_name| {
                     // Add the items from this name group. Those are all subsequent items in
                     // `importables` whose name match `common_importable_name`.
+
                     importables
                         .iter()
                         .copied()
@@ -434,11 +460,8 @@ pub fn search_dependencies(
                         .filter(move |item| {
                             !query.case_sensitive || {
                                 // we've already checked the common importables name case-insensitively
-                                let &(ref import_infos, assoc_mode) = &import_map.map[item];
+                                let &(ref import_infos, _) = &import_map.map[item];
-                                query.matches_assoc_mode(assoc_mode)
+                                import_infos.iter().any(|info| query.import_matches(info, false))
-                                    && import_infos
-                                        .iter()
-                                        .any(|info| query.import_matches(db, info, false))
                             }
                         })
                 });

crates/ide-db/src/items_locator.rs

@@ -36,7 +36,8 @@ pub fn items_with_name<'a>(
         NameToImport::Prefix(exact_name, case_sensitive)
         | NameToImport::Exact(exact_name, case_sensitive) => {
             let mut local_query = symbol_index::Query::new(exact_name.clone());
-            let mut external_query = import_map::Query::new(exact_name);
+            let mut external_query =
+                import_map::Query::new(exact_name).assoc_search_mode(assoc_item_search);
             if prefix {
                 local_query.prefix();
                 external_query = external_query.prefix();

crates/rust-analyzer/src/integrated_benchmarks.rs

@@ -32,7 +32,10 @@ fn integrated_highlighting_benchmark() {
     let workspace_to_load = project_root();
     let file = "./crates/rust-analyzer/src/config.rs";
 
-    let cargo_config = CargoConfig::default();
+    let cargo_config = CargoConfig {
+        sysroot: Some(project_model::RustLibSource::Discover),
+        ..CargoConfig::default()
+    };
     let load_cargo_config = LoadCargoConfig {
         load_out_dirs_from_check: true,
         with_proc_macro_server: ProcMacroServerChoice::None,
@@ -85,7 +88,10 @@ fn integrated_completion_benchmark() {
     let workspace_to_load = project_root();
     let file = "./crates/hir/src/lib.rs";
 
-    let cargo_config = CargoConfig::default();
+    let cargo_config = CargoConfig {
+        sysroot: Some(project_model::RustLibSource::Discover),
+        ..CargoConfig::default()
+    };
     let load_cargo_config = LoadCargoConfig {
         load_out_dirs_from_check: true,
         with_proc_macro_server: ProcMacroServerChoice::None,