Resolve documentation links in rustc and store the results in metadata

This commit implements MCP https://github.com/rust-lang/compiler-team/issues/584

It also removes code that is no longer used, and that includes code cloning resolver, so issue #83761 is fixed.

compiler/rustc_middle/src/arena.rs

@@ -113,6 +113,7 @@ macro_rules! arena_types {
             [decode] trait_impl_trait_tys: rustc_data_structures::fx::FxHashMap<rustc_hir::def_id::DefId, rustc_middle::ty::Ty<'tcx>>,
             [] bit_set_u32: rustc_index::bit_set::BitSet<u32>,
             [] external_constraints: rustc_middle::traits::solve::ExternalConstraintsData<'tcx>,
+            [decode] doc_link_resolutions: rustc_hir::def::DocLinkResMap,
         ]);
     )
 }

compiler/rustc_middle/src/query/mod.rs

@@ -2156,4 +2156,16 @@ rustc_queries! {
         desc { |tcx| "deducing parameter attributes for {}", tcx.def_path_str(def_id) }
         separate_provide_extern
     }
+
+    query doc_link_resolutions(def_id: DefId) -> &'tcx DocLinkResMap {
+        eval_always
+        desc { "resolutions for documentation links for a module" }
+        separate_provide_extern
+    }
+
+    query doc_link_traits_in_scope(def_id: DefId) -> &'tcx [DefId] {
+        eval_always
+        desc { "traits in scope for documentation links for a module" }
+        separate_provide_extern
+    }
 }

compiler/rustc_middle/src/ty/mod.rs

@@ -36,7 +36,7 @@ use rustc_data_structures::intern::Interned;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::tagged_ptr::CopyTaggedPtr;
 use rustc_hir as hir;
-use rustc_hir::def::{CtorKind, CtorOf, DefKind, LifetimeRes, Res};
+use rustc_hir::def::{CtorKind, CtorOf, DefKind, DocLinkResMap, LifetimeRes, Res};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LocalDefIdMap};
 use rustc_hir::Node;
 use rustc_index::vec::IndexVec;
@@ -181,6 +181,8 @@ pub struct ResolverGlobalCtxt {
     /// exist under `std`. For example, wrote `str::from_utf8` instead of `std::str::from_utf8`.
     pub confused_type_with_std_module: FxHashMap<Span, Span>,
     pub registered_tools: RegisteredTools,
+    pub doc_link_resolutions: FxHashMap<LocalDefId, DocLinkResMap>,
+    pub doc_link_traits_in_scope: FxHashMap<LocalDefId, Vec<DefId>>,
 }
 
 /// Resolutions that should only be used for lowering.

compiler/rustc_middle/src/ty/parameterized.rs

@@ -81,6 +81,8 @@ trivially_parameterized_over_tcx! {
     rustc_hir::IsAsync,
     rustc_hir::LangItem,
     rustc_hir::def::DefKind,
+    rustc_hir::def::DocLinkResMap,
+    rustc_hir::def_id::DefId,
     rustc_hir::def_id::DefIndex,
     rustc_hir::definitions::DefKey,
     rustc_index::bit_set::BitSet<u32>,

compiler/rustc_middle/src/ty/query.rs

@@ -45,7 +45,7 @@ use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir as hir;
-use rustc_hir::def::DefKind;
+use rustc_hir::def::{DefKind, DocLinkResMap};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId};
 use rustc_hir::hir_id::OwnerId;
 use rustc_hir::lang_items::{LangItem, LanguageItems};