Rename path_to_res to def_path_res

clippy_lints/src/disallowed_methods.rs

@@ -77,7 +77,7 @@ impl<'tcx> LateLintPass<'tcx> for DisallowedMethods {
     fn check_crate(&mut self, cx: &LateContext<'_>) {
         for (index, conf) in self.conf_disallowed.iter().enumerate() {
             let segs: Vec<_> = conf.path().split("::").collect();
-            if let Res::Def(_, id) = clippy_utils::path_to_res(cx, &segs) {
+            if let Res::Def(_, id) = clippy_utils::def_path_res(cx, &segs) {
                 self.disallowed.insert(id, index);
             }
         }

clippy_lints/src/disallowed_types.rs

@@ -96,7 +96,7 @@ impl<'tcx> LateLintPass<'tcx> for DisallowedTypes {
                 ),
             };
             let segs: Vec<_> = path.split("::").collect();
-            match clippy_utils::path_to_res(cx, &segs) {
+            match clippy_utils::def_path_res(cx, &segs) {
                 Res::Def(_, id) => {
                     self.def_ids.insert(id, reason);
                 },

clippy_lints/src/missing_enforced_import_rename.rs

@@ -58,7 +58,7 @@ impl_lint_pass!(ImportRename => [MISSING_ENFORCED_IMPORT_RENAMES]);
 impl LateLintPass<'_> for ImportRename {
     fn check_crate(&mut self, cx: &LateContext<'_>) {
         for Rename { path, rename } in &self.conf_renames {
-            if let Res::Def(_, id) = clippy_utils::path_to_res(cx, &path.split("::").collect::<Vec<_>>()) {
+            if let Res::Def(_, id) = clippy_utils::def_path_res(cx, &path.split("::").collect::<Vec<_>>()) {
                 self.renames.insert(id, Symbol::intern(rename));
             }
         }

clippy_lints/src/utils/internal_lints.rs

@@ -4,8 +4,8 @@ use clippy_utils::macros::root_macro_call_first_node;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::match_type;
 use clippy_utils::{
-    higher, is_else_clause, is_expn_of, is_expr_path_def_path, is_lint_allowed, match_def_path, method_calls,
+    def_path_res, higher, is_else_clause, is_expn_of, is_expr_path_def_path, is_lint_allowed, match_def_path,
-    path_to_res, paths, peel_blocks_with_stmt, SpanlessEq,
+    method_calls, paths, peel_blocks_with_stmt, SpanlessEq,
 };
 use if_chain::if_chain;
 use rustc_ast as ast;
@@ -844,7 +844,7 @@ impl<'tcx> LateLintPass<'tcx> for MatchTypeOnDiagItem {
             // Extract the path to the matched type
             if let Some(segments) = path_to_matched_type(cx, ty_path);
             let segments: Vec<&str> = segments.iter().map(Symbol::as_str).collect();
-            if let Some(ty_did) = path_to_res(cx, &segments[..]).opt_def_id();
+            if let Some(ty_did) = def_path_res(cx, &segments[..]).opt_def_id();
             // Check if the matched type is a diagnostic item
             if let Some(item_name) = cx.tcx.get_diagnostic_name(ty_did);
             then {
@@ -917,7 +917,7 @@ fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Ve
 // This is not a complete resolver for paths. It works on all the paths currently used in the paths
 // module.  That's all it does and all it needs to do.
 pub fn check_path(cx: &LateContext<'_>, path: &[&str]) -> bool {
-    if path_to_res(cx, path) != Res::Err {
+    if def_path_res(cx, path) != Res::Err {
         return true;
     }
 
@@ -999,7 +999,7 @@ impl<'tcx> LateLintPass<'tcx> for InterningDefinedSymbol {
         }
 
         for &module in &[&paths::KW_MODULE, &paths::SYM_MODULE] {
-            if let Some(def_id) = path_to_res(cx, module).opt_def_id() {
+            if let Some(def_id) = def_path_res(cx, module).opt_def_id() {
                 for item in cx.tcx.module_children(def_id).iter() {
                     if_chain! {
                         if let Res::Def(DefKind::Const, item_def_id) = item.res;

clippy_utils/src/lib.rs

@@ -497,8 +497,9 @@ pub fn path_to_local_id(expr: &Expr<'_>, id: HirId) -> bool {
     path_to_local(expr) == Some(id)
 }
 
-/// Gets the definition associated to a path.
+/// Resolves a def path like `std::vec::Vec`.
-pub fn path_to_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
+/// This function is expensive and should be used sparingly.
+pub fn def_path_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
     macro_rules! try_res {
         ($e:expr) => {
             match $e {
@@ -574,7 +575,7 @@ pub fn path_to_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
 /// Convenience function to get the `DefId` of a trait by path.
 /// It could be a trait or trait alias.
 pub fn get_trait_def_id(cx: &LateContext<'_>, path: &[&str]) -> Option<DefId> {
-    match path_to_res(cx, path) {
+    match def_path_res(cx, path) {
         Res::Def(DefKind::Trait | DefKind::TraitAlias, trait_id) => Some(trait_id),
         _ => None,
     }