rm ItemKind::OpaqueTy

This introduce an additional collection of opaques on HIR, as they can no
longer be listed using the free item list.

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

@@ -732,6 +732,19 @@ impl<'hir> Map<'hir> {
         }
     }
 
+    #[track_caller]
+    pub fn expect_opaque_ty(self, id: LocalDefId) -> &'hir OpaqueTy<'hir> {
+        match self.tcx.hir_node_by_def_id(id) {
+            Node::OpaqueTy(opaq) => opaq,
+            _ => {
+                bug!(
+                    "expected opaque type definition, found {}",
+                    self.node_to_string(self.tcx.local_def_id_to_hir_id(id))
+                )
+            }
+        }
+    }
+
     pub fn expect_expr(self, id: HirId) -> &'hir Expr<'hir> {
         match self.tcx.hir_node(id) {
             Node::Expr(expr) => expr,
@@ -923,6 +936,7 @@ impl<'hir> Map<'hir> {
             Node::Ty(ty) => ty.span,
             Node::AssocItemConstraint(constraint) => constraint.span,
             Node::TraitRef(tr) => tr.path.span,
+            Node::OpaqueTy(op) => op.span,
             Node::Pat(pat) => pat.span,
             Node::PatField(field) => field.span,
             Node::Arm(arm) => arm.span,
@@ -1006,6 +1020,10 @@ impl<'hir> intravisit::Map<'hir> for Map<'hir> {
         self.tcx.hir_node(hir_id)
     }
 
+    fn hir_node_by_def_id(&self, def_id: LocalDefId) -> Node<'hir> {
+        self.tcx.hir_node_by_def_id(def_id)
+    }
+
     fn body(&self, id: BodyId) -> &'hir Body<'hir> {
         (*self).body(id)
     }
@@ -1139,7 +1157,6 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
                 ItemKind::ForeignMod { .. } => "foreign mod",
                 ItemKind::GlobalAsm(..) => "global asm",
                 ItemKind::TyAlias(..) => "ty",
-                ItemKind::OpaqueTy(..) => "opaque type",
                 ItemKind::Enum(..) => "enum",
                 ItemKind::Struct(..) => "struct",
                 ItemKind::Union(..) => "union",
@@ -1191,6 +1208,7 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
         Node::Ty(_) => node_str("type"),
         Node::AssocItemConstraint(_) => node_str("assoc item constraint"),
         Node::TraitRef(_) => node_str("trait ref"),
+        Node::OpaqueTy(_) => node_str("opaque type"),
         Node::Pat(_) => node_str("pat"),
         Node::PatField(_) => node_str("pattern field"),
         Node::Param(_) => node_str("param"),
@@ -1228,6 +1246,7 @@ pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalModDefId) -> Mod
         impl_items,
         foreign_items,
         body_owners,
+        opaques,
         ..
     } = collector;
     ModuleItems {
@@ -1237,6 +1256,7 @@ pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalModDefId) -> Mod
         impl_items: impl_items.into_boxed_slice(),
         foreign_items: foreign_items.into_boxed_slice(),
         body_owners: body_owners.into_boxed_slice(),
+        opaques: opaques.into_boxed_slice(),
     }
 }
 
@@ -1256,6 +1276,7 @@ pub(crate) fn hir_crate_items(tcx: TyCtxt<'_>, _: ()) -> ModuleItems {
         impl_items,
         foreign_items,
         body_owners,
+        opaques,
         ..
     } = collector;
 
@@ -1266,6 +1287,7 @@ pub(crate) fn hir_crate_items(tcx: TyCtxt<'_>, _: ()) -> ModuleItems {
         impl_items: impl_items.into_boxed_slice(),
         foreign_items: foreign_items.into_boxed_slice(),
         body_owners: body_owners.into_boxed_slice(),
+        opaques: opaques.into_boxed_slice(),
     }
 }
 
@@ -1280,6 +1302,7 @@ struct ItemCollector<'tcx> {
     impl_items: Vec<ImplItemId>,
     foreign_items: Vec<ForeignItemId>,
     body_owners: Vec<LocalDefId>,
+    opaques: Vec<LocalDefId>,
 }
 
 impl<'tcx> ItemCollector<'tcx> {
@@ -1293,6 +1316,7 @@ impl<'tcx> ItemCollector<'tcx> {
             impl_items: Vec::default(),
             foreign_items: Vec::default(),
             body_owners: Vec::default(),
+            opaques: Vec::default(),
         }
     }
 }
@@ -1338,6 +1362,11 @@ impl<'hir> Visitor<'hir> for ItemCollector<'hir> {
         intravisit::walk_inline_const(self, c)
     }
 
+    fn visit_opaque_ty(&mut self, o: &'hir OpaqueTy<'hir>) {
+        self.opaques.push(o.def_id);
+        intravisit::walk_opaque_ty(self, o)
+    }
+
     fn visit_expr(&mut self, ex: &'hir Expr<'hir>) {
         if let ExprKind::Closure(closure) = ex.kind {
             self.body_owners.push(closure.def_id);

compiler/rustc_middle/src/hir/mod.rs

@@ -28,6 +28,7 @@ pub struct ModuleItems {
     trait_items: Box<[TraitItemId]>,
     impl_items: Box<[ImplItemId]>,
     foreign_items: Box<[ForeignItemId]>,
+    opaques: Box<[LocalDefId]>,
     body_owners: Box<[LocalDefId]>,
 }
 
@@ -65,6 +66,10 @@ impl ModuleItems {
             .chain(self.foreign_items.iter().map(|id| id.owner_id))
     }
 
+    pub fn opaques(&self) -> impl Iterator<Item = LocalDefId> + '_ {
+        self.opaques.iter().copied()
+    }
+
     pub fn definitions(&self) -> impl Iterator<Item = LocalDefId> + '_ {
         self.owners().map(|id| id.def_id)
     }
@@ -96,6 +101,13 @@ impl ModuleItems {
     ) -> Result<(), ErrorGuaranteed> {
         try_par_for_each_in(&self.foreign_items[..], |&id| f(id))
     }
+
+    pub fn par_opaques(
+        &self,
+        f: impl Fn(LocalDefId) -> Result<(), ErrorGuaranteed> + DynSend + DynSync,
+    ) -> Result<(), ErrorGuaranteed> {
+        try_par_for_each_in(&self.opaques[..], |&id| f(id))
+    }
 }
 
 impl<'tcx> TyCtxt<'tcx> {

compiler/rustc_middle/src/ty/context.rs

@@ -56,7 +56,7 @@ use rustc_type_ir::lang_items::TraitSolverLangItem;
 pub use rustc_type_ir::lift::Lift;
 use rustc_type_ir::solve::SolverMode;
 use rustc_type_ir::{CollectAndApply, Interner, TypeFlags, WithCachedTypeInfo, search_graph};
-use tracing::{debug, instrument};
+use tracing::{debug, trace};
 
 use crate::arena::Arena;
 use crate::dep_graph::{DepGraph, DepKindStruct};
@@ -2073,9 +2073,11 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     /// Returns the origin of the opaque type `def_id`.
-    #[instrument(skip(self), level = "trace", ret)]
+    #[track_caller]
     pub fn opaque_type_origin(self, def_id: LocalDefId) -> hir::OpaqueTyOrigin {
-        self.hir().expect_item(def_id).expect_opaque_ty().origin
+        let origin = self.hir().expect_opaque_ty(def_id).origin;
+        trace!("opaque_type_origin({def_id:?}) => {origin:?}");
+        origin
     }
 }
 
@@ -3031,8 +3033,7 @@ impl<'tcx> TyCtxt<'tcx> {
 
         loop {
             let parent = self.local_parent(opaque_lifetime_param_def_id);
-            let hir::OpaqueTy { lifetime_mapping, .. } =
-                self.hir_node_by_def_id(parent).expect_item().expect_opaque_ty();
+            let hir::OpaqueTy { lifetime_mapping, .. } = self.hir().expect_opaque_ty(parent);
 
             let Some((lifetime, _)) = lifetime_mapping
                 .iter()

compiler/rustc_middle/src/ty/diagnostics.rs

@@ -507,14 +507,8 @@ impl<'v> hir::intravisit::Visitor<'v> for TraitObjectVisitor<'v> {
                     ..
                 },
                 _,
-            ) => {
-                self.0.push(ty);
-            }
-            hir::TyKind::OpaqueDef(item_id, _) => {
-                self.0.push(ty);
-                let item = self.1.item(item_id);
-                hir::intravisit::walk_item(self, item);
-            }
+            )
+            | hir::TyKind::OpaqueDef(..) => self.0.push(ty),
             _ => {}
         }
         hir::intravisit::walk_ty(self, ty);

compiler/rustc_middle/src/ty/sty.rs

@@ -21,6 +21,7 @@ use rustc_target::spec::abi;
 use rustc_type_ir::TyKind::*;
 use rustc_type_ir::visit::TypeVisitableExt;
 use rustc_type_ir::{self as ir, BoundVar, CollectAndApply, DynKind};
+use tracing::instrument;
 use ty::util::{AsyncDropGlueMorphology, IntTypeExt};
 
 use super::GenericParamDefKind;
@@ -500,6 +501,7 @@ impl<'tcx> Ty<'tcx> {
     }
 
     #[inline]
+    #[instrument(level = "debug", skip(tcx))]
     pub fn new_opaque(tcx: TyCtxt<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>) -> Ty<'tcx> {
         Ty::new_alias(tcx, ty::Opaque, AliasTy::new_from_args(tcx, def_id, args))
     }