Only clone when required

Author: mo8it

crates/rust-analyzer/src/cli/analysis_stats.rs

@@ -1075,12 +1075,12 @@ fn location_csv_pat(db: &RootDatabase, vfs: &Vfs, sm: &BodySourceMap, pat_id: Pa
     format!("{path},{}:{},{}:{}", start.line + 1, start.col, end.line + 1, end.col)
 }
 
-fn expr_syntax_range(
+fn expr_syntax_range<'a>(
     db: &RootDatabase,
-    vfs: &Vfs,
+    vfs: &'a Vfs,
     sm: &BodySourceMap,
     expr_id: ExprId,
-) -> Option<(VfsPath, LineCol, LineCol)> {
+) -> Option<(&'a VfsPath, LineCol, LineCol)> {
     let src = sm.expr_syntax(expr_id);
     if let Ok(src) = src {
         let root = db.parse_or_expand(src.file_id);
@@ -1096,12 +1096,12 @@ fn expr_syntax_range(
         None
     }
 }
-fn pat_syntax_range(
+fn pat_syntax_range<'a>(
     db: &RootDatabase,
-    vfs: &Vfs,
+    vfs: &'a Vfs,
     sm: &BodySourceMap,
     pat_id: PatId,
-) -> Option<(VfsPath, LineCol, LineCol)> {
+) -> Option<(&'a VfsPath, LineCol, LineCol)> {
     let src = sm.pat_syntax(pat_id);
     if let Ok(src) = src {
         let root = db.parse_or_expand(src.file_id);

crates/rust-analyzer/src/global_state.rs

@@ -297,7 +297,7 @@ impl GlobalState {
             let mut bytes = vec![];
             let mut modified_rust_files = vec![];
             for file in changed_files {
-                let vfs_path = &vfs.file_path(file.file_id);
+                let vfs_path = vfs.file_path(file.file_id);
                 if let Some(path) = vfs_path.as_path() {
                     let path = path.to_path_buf();
                     if reload::should_refresh_for_change(&path, file.kind()) {
@@ -481,23 +481,23 @@ impl GlobalStateSnapshot {
     }
 
     pub(crate) fn anchored_path(&self, path: &AnchoredPathBuf) -> Url {
-        let mut base = self.vfs_read().file_path(path.anchor);
+        let mut base = self.vfs_read().file_path(path.anchor).clone();
         base.pop();
         let path = base.join(&path.path).unwrap();
         let path = path.as_path().unwrap();
         url_from_abs_path(path)
     }
 
     pub(crate) fn file_id_to_file_path(&self, file_id: FileId) -> vfs::VfsPath {
-        self.vfs_read().file_path(file_id)
+        self.vfs_read().file_path(file_id).clone()
     }
 
     pub(crate) fn cargo_target_for_crate_root(
         &self,
         crate_id: CrateId,
     ) -> Option<(&CargoWorkspace, Target)> {
         let file_id = self.analysis.crate_root(crate_id).ok()?;
-        let path = self.vfs_read().file_path(file_id);
+        let path = self.vfs_read().file_path(file_id).clone();
         let path = path.as_path()?;
         self.workspaces.iter().find_map(|ws| match ws {
             ProjectWorkspace::Cargo { cargo, .. } => {

crates/rust-analyzer/src/handlers/request.rs

@@ -2097,7 +2097,7 @@ pub(crate) fn fetch_dependency_list(
         .into_iter()
         .filter_map(|it| {
             let root_file_path = state.file_id_to_file_path(it.root_file_id);
-            crate_path(root_file_path).and_then(to_url).map(|path| CrateInfoResult {
+            crate_path(&root_file_path).and_then(to_url).map(|path| CrateInfoResult {
                 name: it.name,
                 version: it.version,
                 path,
@@ -2118,7 +2118,7 @@ pub(crate) fn fetch_dependency_list(
 /// An `Option` value representing the path to the directory of the crate with the given
 /// name, if such a crate is found. If no crate with the given name is found, this function
 /// returns `None`.
-fn crate_path(root_file_path: VfsPath) -> Option<VfsPath> {
+fn crate_path(root_file_path: &VfsPath) -> Option<VfsPath> {
     let mut current_dir = root_file_path.parent();
     while let Some(path) = current_dir {
         let cargo_toml_path = path.join("../Cargo.toml")?;

crates/vfs/src/lib.rs

@@ -163,8 +163,8 @@ impl Vfs {
     /// # Panics
     ///
     /// Panics if the id is not present in the `Vfs`.
-    pub fn file_path(&self, file_id: FileId) -> VfsPath {
-        self.interner.lookup(file_id).clone()
+    pub fn file_path(&self, file_id: FileId) -> &VfsPath {
+        self.interner.lookup(file_id)
     }
 
     /// Returns an iterator over the stored ids and their corresponding paths.