Rollup merge of #106403 - compiler-errors:rename-hir-methods, r=cjgillot

Rename `hir::Map::{get_,find_}parent_node` to `hir::Map::{,opt_}parent_id`, and add `hir::Map::{get,find}_parent`

The `hir::Map::get_parent_node` function doesn't return a `Node`, and I think that's quite confusing. Let's rename it to something that sounds more like something that gets the parent hir id => `hir::Map::parent_id`. Same with `find_parent_node` => `opt_parent_id`.

Also, combine `hir.get(hir.parent_id(hir_id))` and similar `hir.find(hir.parent_id(hir_id))` function into new functions that actually retrieve the parent node in one call. This last commit is the only one that might need to be looked at closely.

16 files changed, 24 insertions, 25 deletions

diff --git a/src/librustdoc/passes/check_doc_test_visibility.rs b/src/librustdoc/passes/check_doc_test_visibility.rs
index 057d2fdd9d5..6aa2dda980c 100644
--- a/src/librustdoc/passes/check_doc_test_visibility.rs
+++ b/src/librustdoc/passes/check_doc_test_visibility.rs
@@ -82,7 +82,7 @@ pub(crate) fn should_have_doc_example(cx: &DocContext<'_>, item: &clean::Item) -
     let hir_id = cx.tcx.hir().local_def_id_to_hir_id(item.item_id.expect_def_id().expect_local());
 
     // check if parent is trait impl
-    if let Some(parent_hir_id) = cx.tcx.hir().find_parent_node(hir_id) {
+    if let Some(parent_hir_id) = cx.tcx.hir().opt_parent_id(hir_id) {
         if let Some(parent_node) = cx.tcx.hir().find(parent_hir_id) {
             if matches!(
                 parent_node,
diff --git a/src/tools/clippy/clippy_lints/src/casts/cast_slice_different_sizes.rs b/src/tools/clippy/clippy_lints/src/casts/cast_slice_different_sizes.rs
index c8e54d7b8e0..27cc5a1c3f0 100644
--- a/src/tools/clippy/clippy_lints/src/casts/cast_slice_different_sizes.rs
+++ b/src/tools/clippy/clippy_lints/src/casts/cast_slice_different_sizes.rs
@@ -68,7 +68,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>, msrv: &Msrv
 fn is_child_of_cast(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     let map = cx.tcx.hir();
     if_chain! {
-        if let Some(parent_id) = map.find_parent_node(expr.hir_id);
+        if let Some(parent_id) = map.opt_parent_id(expr.hir_id);
         if let Some(parent) = map.find(parent_id);
         then {
             let expr = match parent {
diff --git a/src/tools/clippy/clippy_lints/src/escape.rs b/src/tools/clippy/clippy_lints/src/escape.rs
index 1d09adec12f..dfb43893326 100644
--- a/src/tools/clippy/clippy_lints/src/escape.rs
+++ b/src/tools/clippy/clippy_lints/src/escape.rs
@@ -131,7 +131,7 @@ fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool {
         _ => return false,
     }
 
-    matches!(map.find(map.get_parent_node(id)), Some(Node::Param(_)))
+    matches!(map.find_parent(id), Some(Node::Param(_)))
 }
 
 impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> {
@@ -156,8 +156,8 @@ impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> {
             let map = &self.cx.tcx.hir();
             if is_argument(*map, cmt.hir_id) {
                 // Skip closure arguments
-                let parent_id = map.get_parent_node(cmt.hir_id);
-                if let Some(Node::Expr(..)) = map.find(map.get_parent_node(parent_id)) {
+                let parent_id = map.parent_id(cmt.hir_id);
+                if let Some(Node::Expr(..)) = map.find_parent(parent_id) {
                     return;
                 }
 
diff --git a/src/tools/clippy/clippy_lints/src/index_refutable_slice.rs b/src/tools/clippy/clippy_lints/src/index_refutable_slice.rs
index cf35b1f175c..bdeddf44df7 100644
--- a/src/tools/clippy/clippy_lints/src/index_refutable_slice.rs
+++ b/src/tools/clippy/clippy_lints/src/index_refutable_slice.rs
@@ -251,7 +251,7 @@ impl<'a, 'tcx> Visitor<'tcx> for SliceIndexLintingVisitor<'a, 'tcx> {
                 let map = cx.tcx.hir();
 
                 // Checking for slice indexing
-                let parent_id = map.get_parent_node(expr.hir_id);
+                let parent_id = map.parent_id(expr.hir_id);
                 if let Some(hir::Node::Expr(parent_expr)) = map.find(parent_id);
                 if let hir::ExprKind::Index(_, index_expr) = parent_expr.kind;
                 if let Some((Constant::Int(index_value), _)) = constant(cx, cx.typeck_results(), index_expr);
@@ -259,7 +259,7 @@ impl<'a, 'tcx> Visitor<'tcx> for SliceIndexLintingVisitor<'a, 'tcx> {
                 if index_value < max_suggested_slice;
 
                 // Make sure that this slice index is read only
-                let maybe_addrof_id = map.get_parent_node(parent_id);
+                let maybe_addrof_id = map.parent_id(parent_id);
                 if let Some(hir::Node::Expr(maybe_addrof_expr)) = map.find(maybe_addrof_id);
                 if let hir::ExprKind::AddrOf(_kind, hir::Mutability::Not, _inner_expr) = maybe_addrof_expr.kind;
                 then {
diff --git a/src/tools/clippy/clippy_lints/src/loops/same_item_push.rs b/src/tools/clippy/clippy_lints/src/loops/same_item_push.rs
index 07edee46fa6..540656a2cd9 100644
--- a/src/tools/clippy/clippy_lints/src/loops/same_item_push.rs
+++ b/src/tools/clippy/clippy_lints/src/loops/same_item_push.rs
@@ -63,7 +63,7 @@ pub(super) fn check<'tcx>(
                                 if let Node::Pat(pat) = node;
                                 if let PatKind::Binding(bind_ann, ..) = pat.kind;
                                 if !matches!(bind_ann, BindingAnnotation(_, Mutability::Mut));
-                                let parent_node = cx.tcx.hir().get_parent_node(hir_id);
+                                let parent_node = cx.tcx.hir().parent_id(hir_id);
                                 if let Some(Node::Local(parent_let_expr)) = cx.tcx.hir().find(parent_node);
                                 if let Some(init) = parent_let_expr.init;
                                 then {
diff --git a/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs b/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs
index 8d447c37150..38f41d077c1 100644
--- a/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs
@@ -74,7 +74,7 @@ impl<'tcx> LateLintPass<'tcx> for ManualRemEuclid {
             && let Some(hir_id) = path_to_local(expr3)
             && let Some(Node::Pat(_)) = cx.tcx.hir().find(hir_id) {
                 // Apply only to params or locals with annotated types
-                match cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+                match cx.tcx.hir().find_parent(hir_id) {
                     Some(Node::Param(..)) => (),
                     Some(Node::Local(local)) => {
                         let Some(ty) = local.ty else { return };
diff --git a/src/tools/clippy/clippy_lints/src/matches/match_single_binding.rs b/src/tools/clippy/clippy_lints/src/matches/match_single_binding.rs
index c94a1f76330..065a5c72621 100644
--- a/src/tools/clippy/clippy_lints/src/matches/match_single_binding.rs
+++ b/src/tools/clippy/clippy_lints/src/matches/match_single_binding.rs
@@ -140,8 +140,8 @@ pub(crate) fn check<'a>(cx: &LateContext<'a>, ex: &Expr<'a>, arms: &[Arm<'_>], e
 fn opt_parent_assign_span<'a>(cx: &LateContext<'a>, ex: &Expr<'a>) -> Option<AssignmentExpr> {
     let map = &cx.tcx.hir();
 
-    if let Some(Node::Expr(parent_arm_expr)) = map.find(map.get_parent_node(ex.hir_id)) {
-        return match map.find(map.get_parent_node(parent_arm_expr.hir_id)) {
+    if let Some(Node::Expr(parent_arm_expr)) = map.find_parent(ex.hir_id) {
+        return match map.find_parent(parent_arm_expr.hir_id) {
             Some(Node::Local(parent_let_expr)) => Some(AssignmentExpr::Local {
                 span: parent_let_expr.span,
                 pat_span: parent_let_expr.pat.span(),
@@ -183,8 +183,7 @@ fn sugg_with_curlies<'a>(
 
     // If the parent is already an arm, and the body is another match statement,
     // we need curly braces around suggestion
-    let parent_node_id = cx.tcx.hir().get_parent_node(match_expr.hir_id);
-    if let Node::Arm(arm) = &cx.tcx.hir().get(parent_node_id) {
+    if let Node::Arm(arm) = &cx.tcx.hir().get_parent(match_expr.hir_id) {
         if let ExprKind::Match(..) = arm.body.kind {
             cbrace_end = format!("\n{indent}}}");
             // Fix body indent due to the match
diff --git a/src/tools/clippy/clippy_lints/src/mixed_read_write_in_expression.rs b/src/tools/clippy/clippy_lints/src/mixed_read_write_in_expression.rs
index 321fa4b7f99..f0be7771bb1 100644
--- a/src/tools/clippy/clippy_lints/src/mixed_read_write_in_expression.rs
+++ b/src/tools/clippy/clippy_lints/src/mixed_read_write_in_expression.rs
@@ -186,7 +186,7 @@ fn check_for_unsequenced_reads(vis: &mut ReadVisitor<'_, '_>) {
     let map = &vis.cx.tcx.hir();
     let mut cur_id = vis.write_expr.hir_id;
     loop {
-        let parent_id = map.get_parent_node(cur_id);
+        let parent_id = map.parent_id(cur_id);
         if parent_id == cur_id {
             break;
         }
diff --git a/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs b/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs
index 2f0b7ce16e5..1249db5dc47 100644
--- a/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs
+++ b/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs
@@ -100,7 +100,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
         }
 
         // Exclude non-inherent impls
-        if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+        if let Some(Node::Item(item)) = cx.tcx.hir().find_parent(hir_id) {
             if matches!(
                 item.kind,
                 ItemKind::Impl(Impl { of_trait: Some(_), .. }) | ItemKind::Trait(..)
diff --git a/src/tools/clippy/clippy_lints/src/non_copy_const.rs b/src/tools/clippy/clippy_lints/src/non_copy_const.rs
index 2a3bd4ee6ce..07fd321d69f 100644
--- a/src/tools/clippy/clippy_lints/src/non_copy_const.rs
+++ b/src/tools/clippy/clippy_lints/src/non_copy_const.rs
@@ -366,7 +366,7 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
             let mut dereferenced_expr = expr;
             let mut needs_check_adjustment = true;
             loop {
-                let parent_id = cx.tcx.hir().get_parent_node(cur_expr.hir_id);
+                let parent_id = cx.tcx.hir().parent_id(cur_expr.hir_id);
                 if parent_id == cur_expr.hir_id {
                     break;
                 }
diff --git a/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs b/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs
index 75add4ee4aa..870a1c7d88d 100644
--- a/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs
+++ b/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs
@@ -299,7 +299,7 @@ impl<'tcx> LateLintPass<'tcx> for PassByRefOrValue {
         }
 
         // Exclude non-inherent impls
-        if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+        if let Some(Node::Item(item)) = cx.tcx.hir().find_parent(hir_id) {
             if matches!(
                 item.kind,
                 ItemKind::Impl(Impl { of_trait: Some(_), .. }) | ItemKind::Trait(..)
diff --git a/src/tools/clippy/clippy_lints/src/unit_types/unit_arg.rs b/src/tools/clippy/clippy_lints/src/unit_types/unit_arg.rs
index ef9f740f704..dd120599c04 100644
--- a/src/tools/clippy/clippy_lints/src/unit_types/unit_arg.rs
+++ b/src/tools/clippy/clippy_lints/src/unit_types/unit_arg.rs
@@ -21,7 +21,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         return;
     }
     let map = &cx.tcx.hir();
-    let opt_parent_node = map.find(map.get_parent_node(expr.hir_id));
+    let opt_parent_node = map.find_parent(expr.hir_id);
     if_chain! {
         if let Some(hir::Node::Expr(parent_expr)) = opt_parent_node;
         if is_questionmark_desugar_marked_call(parent_expr);
@@ -192,7 +192,7 @@ fn fmt_stmts_and_call(
 
     let mut stmts_and_call_snippet = stmts_and_call.join(&format!("{}{}", ";\n", " ".repeat(call_expr_indent)));
     // expr is not in a block statement or result expression position, wrap in a block
-    let parent_node = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(call_expr.hir_id));
+    let parent_node = cx.tcx.hir().find_parent(call_expr.hir_id);
     if !matches!(parent_node, Some(Node::Block(_))) && !matches!(parent_node, Some(Node::Stmt(_))) {
         let block_indent = call_expr_indent + 4;
         stmts_and_call_snippet =
diff --git a/src/tools/clippy/clippy_lints/src/unnecessary_wraps.rs b/src/tools/clippy/clippy_lints/src/unnecessary_wraps.rs
index 60b46854b4f..84ec0d0fb1c 100644
--- a/src/tools/clippy/clippy_lints/src/unnecessary_wraps.rs
+++ b/src/tools/clippy/clippy_lints/src/unnecessary_wraps.rs
@@ -91,7 +91,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryWraps {
         }
 
         // Abort if the method is implementing a trait or of it a trait method.
-        if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+        if let Some(Node::Item(item)) = cx.tcx.hir().find_parent(hir_id) {
             if matches!(
                 item.kind,
                 ItemKind::Impl(Impl { of_trait: Some(_), .. }) | ItemKind::Trait(..)
diff --git a/src/tools/clippy/clippy_lints/src/utils/internal_lints/metadata_collector.rs b/src/tools/clippy/clippy_lints/src/utils/internal_lints/metadata_collector.rs
index 929544cd69d..c86f24cbd37 100644
--- a/src/tools/clippy/clippy_lints/src/utils/internal_lints/metadata_collector.rs
+++ b/src/tools/clippy/clippy_lints/src/utils/internal_lints/metadata_collector.rs
@@ -1058,7 +1058,7 @@ fn get_parent_local<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -
 fn get_parent_local_hir_id<'hir>(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
     let map = cx.tcx.hir();
 
-    match map.find(map.get_parent_node(hir_id)) {
+    match map.find_parent((hir_id)) {
         Some(hir::Node::Local(local)) => Some(local),
         Some(hir::Node::Pat(pattern)) => get_parent_local_hir_id(cx, pattern.hir_id),
         _ => None,
diff --git a/src/tools/clippy/clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs b/src/tools/clippy/clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs
index 393988dbad3..7144363637a 100644
--- a/src/tools/clippy/clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs
+++ b/src/tools/clippy/clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs
@@ -219,7 +219,7 @@ fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Ve
     match peel_hir_expr_refs(expr).0.kind {
         ExprKind::Path(ref qpath) => match cx.qpath_res(qpath, expr.hir_id) {
             Res::Local(hir_id) => {
-                let parent_id = cx.tcx.hir().get_parent_node(hir_id);
+                let parent_id = cx.tcx.hir().parent_id(hir_id);
                 if let Some(Node::Local(Local { init: Some(init), .. })) = cx.tcx.hir().find(parent_id) {
                     path_to_matched_type(cx, init)
                 } else {
diff --git a/src/tools/clippy/clippy_utils/src/lib.rs b/src/tools/clippy/clippy_utils/src/lib.rs
index d863609b6a7..8290fe9ecb4 100644
--- a/src/tools/clippy/clippy_utils/src/lib.rs
+++ b/src/tools/clippy/clippy_utils/src/lib.rs
@@ -174,7 +174,7 @@ pub fn find_binding_init<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<
     if_chain! {
         if let Some(Node::Pat(pat)) = hir.find(hir_id);
         if matches!(pat.kind, PatKind::Binding(BindingAnnotation::NONE, ..));
-        let parent = hir.get_parent_node(hir_id);
+        let parent = hir.parent_id(hir_id);
         if let Some(Node::Local(local)) = hir.find(parent);
         then {
             return local.init;
@@ -1287,7 +1287,7 @@ pub fn contains_return(expr: &hir::Expr<'_>) -> bool {
 
 /// Gets the parent node, if any.
 pub fn get_parent_node(tcx: TyCtxt<'_>, id: HirId) -> Option<Node<'_>> {
-    tcx.hir().parent_iter(id).next().map(|(_, node)| node)
+    tcx.hir().find_parent(id)
 }
 
 /// Gets the parent expression, if any –- this is useful to constrain a lint.
@@ -2075,7 +2075,7 @@ pub fn is_no_core_crate(cx: &LateContext<'_>) -> bool {
 /// }
 /// ```
 pub fn is_trait_impl_item(cx: &LateContext<'_>, hir_id: HirId) -> bool {
-    if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+    if let Some(Node::Item(item)) = cx.tcx.hir().find_parent(hir_id) {
         matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
     } else {
         false