update def_path to match the new rust version

rap/src/analysis/utils/def_path.rs

@@ -2,28 +2,57 @@ use rustc_middle::ty::TyCtxt;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
 use rustc_hir::PrimTy;
+use rustc_errors;
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_middle::ty::fast_reject::SimplifiedType;
 use rustc_hir::{ImplItemRef, ItemKind, Mutability, Node, OwnerId, TraitItemRef};
 use rustc_middle::ty::{FloatTy, IntTy, UintTy};
 
-/*
 pub fn def_path_last_def_id<'tcx>(tcx: &TyCtxt<'tcx>, path: &[&str]) -> DefId {
     def_path_def_ids(tcx, path).last().unwrap()
 }
+
+pub struct DefPath {
+    def_ids: Vec<DefId>,
+}
 
+impl DefPath {
+    //path like "std::vec::Vec"
+    pub fn new(raw: &str, tcx: &TyCtxt<'_>) -> Self {
+        let path: Vec<&str> = raw.split("::").collect();
+        let def_ids: Vec<DefId> = def_path_def_ids(tcx, &path).collect();
+        if def_ids.len() == 0 {
+            panic!("Fail to parse def path {}", raw);
+        }
+        DefPath {def_ids}
+    }
+
+    pub fn last_def_id(&self) -> DefId {
+        *self.def_ids.last().unwrap()
+    }
+}
 
-/* Copied from Clippy 
- * https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/lib.rs
+/* Modified from Clippy 
+ * https://github.com/rust-lang/rust-clippy/blob/6d61bd/clippy_utils/src/lib.rs
+ * Note: Commit 6b61bd matches rustc nightly 2024-06-30
  * */
 
 /// Resolves a def path like `std::vec::Vec` to its [`DefId`]s, see [`def_path_res`].
-pub fn def_path_def_ids<'tcx>(tcx: &TyCtxt<'tcx>, path: &[&str]) -> impl Iterator<Item = DefId> {
+pub fn def_path_def_ids(tcx: &TyCtxt<'_>, path: &[&str]) -> impl Iterator<Item = DefId> {
     def_path_res(tcx, path).into_iter().filter_map(|res| res.opt_def_id())
 }
 
+
 pub fn def_path_res(tcx: &TyCtxt<'_>, path: &[&str]) -> Vec<Res> {
-    let (base, path) = match *path {
+    fn find_crates(tcx: TyCtxt<'_>, name: Symbol) -> impl Iterator<Item = DefId> + '_ {
+        tcx.crates(())
+            .iter()
+            .copied()
+            .filter(move |&num| tcx.crate_name(num) == name)
+            .map(CrateNum::as_def_id)
+    }
+
+    let (base, mut path) = match *path {
         [primitive] => {
             return vec![PrimTy::from_name(Symbol::intern(primitive)).map_or(Res::Err, Res::PrimTy)];
         },
@@ -39,16 +68,40 @@ pub fn def_path_res(tcx: &TyCtxt<'_>, path: &[&str]) -> Vec<Res> {
         None
     };
 
-    let crates = find_primitive_impls(tcx, base)
+    let starts = find_primitive_impls(tcx, base)
+        .chain(find_crates(*tcx, base_sym))
         .chain(local_crate)
-        .map(|id| Res::Def(tcx.def_kind(id), id))
-        .chain(find_crates(tcx, base_sym))
-        .collect();
+        .map(|id| Res::Def(tcx.def_kind(id), id));
+
+    let mut resolutions: Vec<Res> = starts.collect();
+
+    while let [segment, rest @ ..] = path {
+        path = rest;
+        let segment = Symbol::intern(segment);
+
+        resolutions = resolutions
+            .into_iter()
+            .filter_map(|res| res.opt_def_id())
+            .flat_map(|def_id| {
+                // When the current def_id is e.g. `struct S`, check the impl items in
+                // `impl S { ... }`
+                let inherent_impl_children = tcx
+                    .inherent_impls(def_id)
+                    .into_iter()
+                    .flatten()
+                    .flat_map(|&impl_def_id| item_children_by_name(tcx, impl_def_id, segment));
+
+                let direct_children = item_children_by_name(tcx, def_id, segment);
 
-    def_path_res_with_base(tcx, crates, path)
+                inherent_impl_children.chain(direct_children)
+            })
+            .collect();
+    }
+
+    resolutions
 }
 
-fn find_primitive_impls<'tcx>(tcx: TyCtxt<'tcx>, name: &str) -> impl Iterator<Item = DefId> + 'tcx {
+fn find_primitive_impls<'tcx>(tcx: &TyCtxt<'tcx>, name: &str) -> impl Iterator<Item = DefId> + 'tcx {
     let ty = match name {
         "bool" => SimplifiedType::Bool,
         "char" => SimplifiedType::Char,
@@ -75,13 +128,17 @@ fn find_primitive_impls<'tcx>(tcx: TyCtxt<'tcx>, name: &str) -> impl Iterator<It
         "f32" => SimplifiedType::Float(FloatTy::F32),
         "f64" => SimplifiedType::Float(FloatTy::F64),
         _ => {
-            return [].iter().copied();
+            return Result::<_, rustc_errors::ErrorGuaranteed>::Ok(&[] as &[_])
+                .into_iter()
+                .flatten()
+                .copied();
         },
     };
-    tcx.incoherent_impls(ty).iter().copied()
+
+    tcx.incoherent_impls(ty).into_iter().flatten().copied()
 }
-*/
-fn non_local_item_children_by_name<'tcx>(tcx: &TyCtxt<'tcx>, def_id: DefId, name: Symbol) -> Vec<Res> {
+
+fn non_local_item_children_by_name(tcx: &TyCtxt<'_>, def_id: DefId, name: Symbol) -> Vec<Res> {
     match tcx.def_kind(def_id) {
         DefKind::Mod | DefKind::Enum | DefKind::Trait => tcx
             .module_children(def_id)
@@ -100,7 +157,7 @@ fn non_local_item_children_by_name<'tcx>(tcx: &TyCtxt<'tcx>, def_id: DefId, name
     }
 }
 
-fn local_item_children_by_name<'tcx>(tcx: &TyCtxt<'tcx>, local_id: LocalDefId, name: Symbol) -> Vec<Res> {
+fn local_item_children_by_name(tcx: &TyCtxt<'_>, local_id: LocalDefId, name: Symbol) -> Vec<Res> {
     let hir = tcx.hir();
 
     let root_mod;
@@ -141,7 +198,7 @@ fn local_item_children_by_name<'tcx>(tcx: &TyCtxt<'tcx>, local_id: LocalDefId, n
     }
 }
 
-fn item_children_by_name<'tcx>(tcx: &TyCtxt<'tcx>, def_id: DefId, name: Symbol) -> Vec<Res> {
+fn item_children_by_name(tcx: &TyCtxt<'_>, def_id: DefId, name: Symbol) -> Vec<Res> {
     if let Some(local_id) = def_id.as_local() {
         local_item_children_by_name(tcx, local_id, name)
     } else {

rap/src/lib.rs

@@ -15,6 +15,7 @@ extern crate rustc_session;
 extern crate rustc_span;
 extern crate rustc_target;
 extern crate rustc_hir;
+extern crate rustc_errors;
 
 use rustc_middle::ty::TyCtxt;
 use rustc_driver::{Compilation, Callbacks};