remove ItemLikeVisitor and DeepVisitor

Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>

Author: kckeiks

compiler/rustc_hir/src/intravisit.rs

@@ -32,43 +32,12 @@
 //! example generator inference, and possibly also HIR borrowck.
 
 use crate::hir::*;
-use crate::itemlikevisit::{ItemLikeVisitor, ParItemLikeVisitor};
+use crate::itemlikevisit::ParItemLikeVisitor;
 use rustc_ast::walk_list;
 use rustc_ast::{Attribute, Label};
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::Span;
 
-pub struct DeepVisitor<'v, V> {
-    visitor: &'v mut V,
-}
-
-impl<'v, V> DeepVisitor<'v, V> {
-    pub fn new(base: &'v mut V) -> Self {
-        DeepVisitor { visitor: base }
-    }
-}
-
-impl<'v, 'hir, V> ItemLikeVisitor<'hir> for DeepVisitor<'v, V>
-where
-    V: Visitor<'hir>,
-{
-    fn visit_item(&mut self, item: &'hir Item<'hir>) {
-        self.visitor.visit_item(item);
-    }
-
-    fn visit_trait_item(&mut self, trait_item: &'hir TraitItem<'hir>) {
-        self.visitor.visit_trait_item(trait_item);
-    }
-
-    fn visit_impl_item(&mut self, impl_item: &'hir ImplItem<'hir>) {
-        self.visitor.visit_impl_item(impl_item);
-    }
-
-    fn visit_foreign_item(&mut self, foreign_item: &'hir ForeignItem<'hir>) {
-        self.visitor.visit_foreign_item(foreign_item);
-    }
-}
-
 pub trait IntoVisitor<'hir> {
     type Visitor: Visitor<'hir>;
     fn into_visitor(&self) -> Self::Visitor;
@@ -315,16 +284,6 @@ pub trait Visitor<'v>: Sized {
         walk_body(self, b);
     }
 
-    /// When invoking `visit_all_item_likes()`, you need to supply an
-    /// item-like visitor. This method converts an "intra-visit"
-    /// visitor into an item-like visitor that walks the entire tree.
-    /// If you use this, you probably don't want to process the
-    /// contents of nested item-like things, since the outer loop will
-    /// visit them as well.
-    fn as_deep_visitor(&mut self) -> DeepVisitor<'_, Self> {
-        DeepVisitor::new(self)
-    }
-
     ///////////////////////////////////////////////////////////////////////////
 
     fn visit_id(&mut self, _hir_id: HirId) {

compiler/rustc_hir/src/itemlikevisit.rs

@@ -1,55 +1,5 @@
 use super::{ForeignItem, ImplItem, Item, TraitItem};
 
-/// The "item-like visitor" defines only the top-level methods
-/// that can be invoked by `Crate::visit_all_item_likes()`. Whether
-/// this trait is the right one to implement will depend on the
-/// overall pattern you need. Here are the three available patterns,
-/// in roughly the order of desirability:
-///
-/// 1. **Shallow visit**: Get a simple callback for every item (or item-like thing) in the HIR.
-///    - Example: find all items with a `#[foo]` attribute on them.
-///    - How: Implement `ItemLikeVisitor` and call `tcx.hir().visit_all_item_likes()`.
-///    - Pro: Efficient; just walks the lists of item-like things, not the nodes themselves.
-///    - Con: Don't get information about nesting
-///    - Con: Don't have methods for specific bits of HIR, like "on
-///      every expr, do this".
-/// 2. **Deep visit**: Want to scan for specific kinds of HIR nodes within
-///    an item, but don't care about how item-like things are nested
-///    within one another.
-///    - Example: Examine each expression to look for its type and do some check or other.
-///    - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to
-///      `nested_filter::OnlyBodies` (and implement `nested_visit_map`), and use
-///      `tcx.hir().visit_all_item_likes(&mut visitor.as_deep_visitor())`. Within your
-///      `intravisit::Visitor` impl, implement methods like `visit_expr()` (don't forget to invoke
-///      `intravisit::walk_expr()` to keep walking the subparts).
-///    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
-///    - Pro: Integrates well into dependency tracking.
-///    - Con: Don't get information about nesting between items
-/// 3. **Nested visit**: Want to visit the whole HIR and you care about the nesting between
-///    item-like things.
-///    - Example: Lifetime resolution, which wants to bring lifetimes declared on the
-///      impl into scope while visiting the impl-items, and then back out again.
-///    - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to
-///      `nested_filter::All` (and implement `nested_visit_map`). Walk your crate with
-///      `tcx.hir().walk_toplevel_module(visitor)` invoked on `tcx.hir().krate()`.
-///    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
-///    - Pro: Preserves nesting information
-///    - Con: Does not integrate well into dependency tracking.
-///
-/// Note: the methods of `ItemLikeVisitor` intentionally have no
-/// defaults, so that as we expand the list of item-like things, we
-/// revisit the various visitors to see if they need to change. This
-/// is harder to do with `intravisit::Visitor`, so when you add a new
-/// `visit_nested_foo()` method, it is recommended that you search for
-/// existing `fn visit_nested` methods to see where changes are
-/// needed.
-pub trait ItemLikeVisitor<'hir> {
-    fn visit_item(&mut self, item: &'hir Item<'hir>);
-    fn visit_trait_item(&mut self, trait_item: &'hir TraitItem<'hir>);
-    fn visit_impl_item(&mut self, impl_item: &'hir ImplItem<'hir>);
-    fn visit_foreign_item(&mut self, foreign_item: &'hir ForeignItem<'hir>);
-}
-
 /// A parallel variant of `ItemLikeVisitor`.
 pub trait ParItemLikeVisitor<'hir> {
     fn visit_item(&self, item: &'hir Item<'hir>);

compiler/rustc_incremental/src/assert_dep_graph.rs

@@ -75,7 +75,7 @@ pub fn assert_dep_graph(tcx: TyCtxt<'_>) {
             let mut visitor =
                 IfThisChanged { tcx, if_this_changed: vec![], then_this_would_need: vec![] };
             visitor.process_attrs(hir::CRATE_HIR_ID);
-            tcx.hir().visit_all_item_likes(&mut visitor.as_deep_visitor());
+            tcx.hir().visit_all_item_likes(&mut visitor);
             (visitor.if_this_changed, visitor.then_this_would_need)
         };
 

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -452,7 +452,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             return;
         }
 
-        self.tcx.hir().visit_all_item_likes(&mut self.as_deep_visitor());
+        self.tcx.hir().visit_all_item_likes(self);
     }
 
     fn encode_def_path_table(&mut self) {

compiler/rustc_middle/src/hir/map/mod.rs

@@ -9,7 +9,6 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID, LOCAL_CRATE};
 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
 use rustc_hir::intravisit::{self, Visitor};
-use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::*;
 use rustc_index::vec::Idx;
 use rustc_middle::hir::nested_filter;
@@ -616,7 +615,7 @@ impl<'hir> Map<'hir> {
     /// visitor and then call `intravisit::walk_crate` instead.
     pub fn visit_all_item_likes<V>(self, visitor: &mut V)
     where
-        V: itemlikevisit::ItemLikeVisitor<'hir>,
+        V: Visitor<'hir>,
     {
         let krate = self.krate();
         for owner in krate.owners.iter().filter_map(|i| i.as_owner()) {
@@ -649,7 +648,7 @@ impl<'hir> Map<'hir> {
 
     pub fn visit_item_likes_in_module<V>(self, module: LocalDefId, visitor: &mut V)
     where
-        V: ItemLikeVisitor<'hir>,
+        V: Visitor<'hir>,
     {
         let module = self.tcx.hir_module_items(module);
 

compiler/rustc_mir_transform/src/lib.rs

@@ -170,7 +170,7 @@ fn mir_keys(tcx: TyCtxt<'_>, (): ()) -> FxIndexSet<LocalDefId> {
             intravisit::walk_struct_def(self, v)
         }
     }
-    tcx.hir().visit_all_item_likes(&mut GatherCtors { tcx, set: &mut set }.as_deep_visitor());
+    tcx.hir().visit_all_item_likes(&mut GatherCtors { tcx, set: &mut set });
 
     set
 }

compiler/rustc_passes/src/check_attr.rs

@@ -2384,7 +2384,7 @@ fn check_non_exported_macro_for_invalid_attrs(tcx: TyCtxt<'_>, item: &Item<'_>)
 
 fn check_mod_attrs(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
     let check_attr_visitor = &mut CheckAttrVisitor { tcx };
-    tcx.hir().visit_item_likes_in_module(module_def_id, &mut check_attr_visitor.as_deep_visitor());
+    tcx.hir().visit_item_likes_in_module(module_def_id, check_attr_visitor);
     if module_def_id.is_top_level_module() {
         check_attr_visitor.check_attributes(CRATE_HIR_ID, DUMMY_SP, Target::Mod, None);
         check_invalid_crate_level_attr(tcx, tcx.hir().krate_attrs());

compiler/rustc_passes/src/intrinsicck.rs

@@ -17,7 +17,7 @@ use rustc_target::asm::{InlineAsmRegOrRegClass, InlineAsmType};
 use rustc_target::spec::abi::Abi::RustIntrinsic;
 
 fn check_mod_intrinsics(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
-    tcx.hir().visit_item_likes_in_module(module_def_id, &mut ItemVisitor { tcx }.as_deep_visitor());
+    tcx.hir().visit_item_likes_in_module(module_def_id, &mut ItemVisitor { tcx });
 }
 
 pub fn provide(providers: &mut Providers) {

compiler/rustc_passes/src/liveness.rs

@@ -140,7 +140,7 @@ fn live_node_kind_to_string(lnk: LiveNodeKind, tcx: TyCtxt<'_>) -> String {
 }
 
 fn check_mod_liveness(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
-    tcx.hir().visit_item_likes_in_module(module_def_id, &mut IrMaps::new(tcx).as_deep_visitor());
+    tcx.hir().visit_item_likes_in_module(module_def_id, &mut IrMaps::new(tcx));
 }
 
 pub fn provide(providers: &mut Providers) {

compiler/rustc_passes/src/loops.rs

@@ -33,7 +33,7 @@ struct CheckLoopVisitor<'a, 'hir> {
 fn check_mod_loops(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
     tcx.hir().visit_item_likes_in_module(
         module_def_id,
-        &mut CheckLoopVisitor { sess: &tcx.sess, hir_map: tcx.hir(), cx: Normal }.as_deep_visitor(),
+        &mut CheckLoopVisitor { sess: &tcx.sess, hir_map: tcx.hir(), cx: Normal },
     );
 }
 

compiler/rustc_passes/src/naked_functions.rs

@@ -14,10 +14,7 @@ use rustc_span::Span;
 use rustc_target::spec::abi::Abi;
 
 fn check_mod_naked_functions(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
-    tcx.hir().visit_item_likes_in_module(
-        module_def_id,
-        &mut CheckNakedFunctions { tcx }.as_deep_visitor(),
-    );
+    tcx.hir().visit_item_likes_in_module(module_def_id, &mut CheckNakedFunctions { tcx });
 }
 
 crate fn provide(providers: &mut Providers) {

compiler/rustc_passes/src/stability.rs

@@ -661,7 +661,7 @@ fn stability_index(tcx: TyCtxt<'_>, (): ()) -> Index {
 /// Cross-references the feature names of unstable APIs with enabled
 /// features and possibly prints errors.
 fn check_mod_unstable_api_usage(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
-    tcx.hir().visit_item_likes_in_module(module_def_id, &mut Checker { tcx }.as_deep_visitor());
+    tcx.hir().visit_item_likes_in_module(module_def_id, &mut Checker { tcx });
 }
 
 pub(crate) fn provide(providers: &mut Providers) {
@@ -837,7 +837,7 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) {
         let mut missing = MissingStabilityAnnotations { tcx, access_levels };
         missing.check_missing_stability(CRATE_DEF_ID, tcx.hir().span(CRATE_HIR_ID));
         tcx.hir().walk_toplevel_module(&mut missing);
-        tcx.hir().visit_all_item_likes(&mut missing.as_deep_visitor());
+        tcx.hir().visit_all_item_likes(&mut missing);
     }
 
     let declared_lang_features = &tcx.features().declared_lang_features;

compiler/rustc_typeck/src/collect.rs

@@ -59,10 +59,7 @@ struct OnlySelfBounds(bool);
 // Main entry point
 
 fn collect_mod_item_types(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
-    tcx.hir().visit_item_likes_in_module(
-        module_def_id,
-        &mut CollectItemTypesVisitor { tcx }.as_deep_visitor(),
-    );
+    tcx.hir().visit_item_likes_in_module(module_def_id, &mut CollectItemTypesVisitor { tcx });
 }
 
 pub fn provide(providers: &mut Providers) {

src/librustdoc/scrape_examples.rs

@@ -303,7 +303,7 @@ crate fn run(
         // Run call-finder on all items
         let mut calls = FxHashMap::default();
         let mut finder = FindCalls { calls: &mut calls, tcx, map: tcx.hir(), cx, target_crates };
-        tcx.hir().visit_all_item_likes(&mut finder.as_deep_visitor());
+        tcx.hir().visit_all_item_likes(&mut finder);
 
         // Sort call locations within a given file in document order
         for fn_calls in calls.values_mut() {