internal: Don't unnecessarily clone ModPaths out of interning wrappers

crates/hir-def/src/data.rs

@@ -628,7 +628,7 @@ impl<'a> AssocItemCollector<'a> {
             'attrs: for attr in &*attrs {
                 let ast_id =
                     AstId::new(self.expander.current_file_id(), item.ast_id(item_tree).upcast());
-                let ast_id_with_path = AstIdWithPath { path: (*attr.path).clone(), ast_id };
+                let ast_id_with_path = AstIdWithPath { path: attr.path.clone(), ast_id };
 
                 match self.def_map.resolve_attr_macro(
                     self.db,

crates/hir-def/src/lib.rs

@@ -56,6 +56,7 @@ pub mod find_path;
 pub mod import_map;
 pub mod visibility;
 
+use intern::Interned;
 pub use rustc_abi as layout;
 use triomphe::Arc;
 
@@ -1408,7 +1409,8 @@ impl AsMacroCall for InFile<&ast::MacroCall> {
 
         macro_call_as_call_id_with_eager(
             db,
-            &AstIdWithPath::new(ast_id.file_id, ast_id.value, path),
+            ast_id,
+            &path,
             call_site.ctx,
             expands_to,
             krate,
@@ -1422,11 +1424,15 @@ impl AsMacroCall for InFile<&ast::MacroCall> {
 #[derive(Clone, Debug, Eq, PartialEq)]
 struct AstIdWithPath<T: AstIdNode> {
     ast_id: AstId<T>,
-    path: path::ModPath,
+    path: Interned<path::ModPath>,
 }
 
 impl<T: AstIdNode> AstIdWithPath<T> {
-    fn new(file_id: HirFileId, ast_id: FileAstId<T>, path: path::ModPath) -> AstIdWithPath<T> {
+    fn new(
+        file_id: HirFileId,
+        ast_id: FileAstId<T>,
+        path: Interned<path::ModPath>,
+    ) -> AstIdWithPath<T> {
         AstIdWithPath { ast_id: AstId::new(file_id, ast_id), path }
     }
 }
@@ -1439,27 +1445,37 @@ fn macro_call_as_call_id(
     krate: CrateId,
     resolver: impl Fn(&path::ModPath) -> Option<MacroDefId> + Copy,
 ) -> Result<Option<MacroCallId>, UnresolvedMacro> {
-    macro_call_as_call_id_with_eager(db, call, call_site, expand_to, krate, resolver, resolver)
+    macro_call_as_call_id_with_eager(
-        .map(|res| res.value)
+        db,
+        call.ast_id,
+        &call.path,
+        call_site,
+        expand_to,
+        krate,
+        resolver,
+        resolver,
+    )
+    .map(|res| res.value)
 }
 
 fn macro_call_as_call_id_with_eager(
     db: &dyn ExpandDatabase,
-    call: &AstIdWithPath<ast::MacroCall>,
+    ast_id: AstId<ast::MacroCall>,
+    path: &path::ModPath,
     call_site: SyntaxContextId,
     expand_to: ExpandTo,
     krate: CrateId,
     resolver: impl FnOnce(&path::ModPath) -> Option<MacroDefId>,
     eager_resolver: impl Fn(&path::ModPath) -> Option<MacroDefId>,
 ) -> Result<ExpandResult<Option<MacroCallId>>, UnresolvedMacro> {
-    let def = resolver(&call.path).ok_or_else(|| UnresolvedMacro { path: call.path.clone() })?;
+    let def = resolver(path).ok_or_else(|| UnresolvedMacro { path: path.clone() })?;
 
     let res = match def.kind {
         MacroDefKind::BuiltInEager(..) => expand_eager_macro_input(
             db,
             krate,
-            &call.ast_id.to_node(db),
+            &ast_id.to_node(db),
-            call.ast_id,
+            ast_id,
             def,
             call_site,
             &|path| eager_resolver(path).filter(MacroDefId::is_fn_like),
@@ -1468,12 +1484,12 @@ fn macro_call_as_call_id_with_eager(
             value: Some(def.make_call(
                 db,
                 krate,
-                MacroCallKind::FnLike { ast_id: call.ast_id, expand_to, eager: None },
+                MacroCallKind::FnLike { ast_id, expand_to, eager: None },
                 call_site,
             )),
             err: None,
         },
-        _ => return Err(UnresolvedMacro { path: call.path.clone() }),
+        _ => return Err(UnresolvedMacro { path: path.clone() }),
     };
     Ok(res)
 }

crates/hir-def/src/nameres/attr_resolution.rs

@@ -59,7 +59,7 @@ impl DefMap {
                     return Ok(ResolvedAttr::Other);
                 }
             }
-            None => return Err(UnresolvedMacro { path: ast_id.path }),
+            None => return Err(UnresolvedMacro { path: ast_id.path.as_ref().clone() }),
         };
 
         Ok(ResolvedAttr::Macro(attr_macro_as_call_id(
@@ -142,7 +142,7 @@ pub(super) fn derive_macro_as_call_id(
 ) -> Result<(MacroId, MacroDefId, MacroCallId), UnresolvedMacro> {
     let (macro_id, def_id) = resolver(&item_attr.path)
         .filter(|(_, def_id)| def_id.is_derive())
-        .ok_or_else(|| UnresolvedMacro { path: item_attr.path.clone() })?;
+        .ok_or_else(|| UnresolvedMacro { path: item_attr.path.as_ref().clone() })?;
     let call_id = def_id.make_call(
         db.upcast(),
         krate,

crates/hir-def/src/nameres/collector.rs

@@ -17,6 +17,7 @@ use hir_expand::{
     proc_macro::CustomProcMacroExpander,
     ExpandTo, HirFileId, InFile, MacroCallId, MacroCallKind, MacroDefId, MacroDefKind,
 };
+use intern::Interned;
 use itertools::{izip, Itertools};
 use la_arena::Idx;
 use limit::Limit;
@@ -1300,7 +1301,11 @@ impl DefCollector<'_> {
                                 let call_id = call_id();
                                 let mut len = 0;
                                 for (idx, (path, call_site)) in derive_macros.enumerate() {
-                                    let ast_id = AstIdWithPath::new(file_id, ast_id.value, path);
+                                    let ast_id = AstIdWithPath::new(
+                                        file_id,
+                                        ast_id.value,
+                                        Interned::new(path),
+                                    );
                                     self.unresolved_macros.push(MacroDirective {
                                         module_id: directive.module_id,
                                         depth: directive.depth + 1,
@@ -1473,7 +1478,7 @@ impl DefCollector<'_> {
                             derive_index: *derive_pos as u32,
                             derive_macro_id: *derive_macro_id,
                         },
-                        ast_id.path.clone(),
+                        ast_id.path.as_ref().clone(),
                     ));
                 }
                 // These are diagnosed by `reseed_with_unresolved_attribute`, as that function consumes them
@@ -2108,7 +2113,7 @@ impl ModCollector<'_, '_> {
             let ast_id = AstIdWithPath::new(
                 self.file_id(),
                 mod_item.ast_id(self.item_tree),
-                attr.path.as_ref().clone(),
+                attr.path.clone(),
             );
             self.def_collector.unresolved_macros.push(MacroDirective {
                 module_id: self.module_id,
@@ -2302,7 +2307,7 @@ impl ModCollector<'_, '_> {
         &MacroCall { ref path, ast_id, expand_to, ctxt }: &MacroCall,
         container: ItemContainerId,
     ) {
-        let ast_id = AstIdWithPath::new(self.file_id(), ast_id, ModPath::clone(path));
+        let ast_id = AstIdWithPath::new(self.file_id(), ast_id, path.clone());
         let db = self.def_collector.db;
 
         // FIXME: Immediately expanding in "Case 1" is insufficient since "Case 2" may also define
@@ -2312,7 +2317,8 @@ impl ModCollector<'_, '_> {
         // Case 1: try to resolve macro calls with single-segment name and expand macro_rules
         if let Ok(res) = macro_call_as_call_id_with_eager(
             db.upcast(),
-            &ast_id,
+            ast_id.ast_id,
+            &ast_id.path,
             ctxt,
             expand_to,
             self.def_collector.def_map.krate,