Rollup merge of rust-lang#79312 - jyn514:doctree-impl, r=GuillaumeGomez

Get rid of `doctree::Impl`

Follow-up to rust-lang#79264, continues breaking up rust-lang#78082. At some point I want to introduce `MaybeInlined`, but I think I'll wait until I need `MaybeInlined::InlinedWithOriginal` because it's not very useful in other situations.

r? ``@GuillaumeGomez``

Author: jonas-schievink

src/librustdoc/clean/mod.rs

@@ -234,9 +234,8 @@ impl Clean<Item> for doctree::Module<'_> {
         items.extend(self.fns.iter().map(|x| x.clean(cx)));
         items.extend(self.foreigns.iter().map(|x| x.clean(cx)));
         items.extend(self.mods.iter().map(|x| x.clean(cx)));
-        items.extend(self.items.iter().map(|x| x.clean(cx)));
+        items.extend(self.items.iter().map(|x| x.clean(cx)).flatten());
         items.extend(self.traits.iter().map(|x| x.clean(cx)));
-        items.extend(self.impls.iter().flat_map(|x| x.clean(cx)));
         items.extend(self.macros.iter().map(|x| x.clean(cx)));
         items.extend(self.proc_macros.iter().map(|x| x.clean(cx)));
 
@@ -1922,8 +1921,8 @@ impl Clean<BareFunctionDecl> for hir::BareFnTy<'_> {
     }
 }
 
-impl Clean<Item> for (&hir::Item<'_>, Option<Ident>) {
-    fn clean(&self, cx: &DocContext<'_>) -> Item {
+impl Clean<Vec<Item>> for (&hir::Item<'_>, Option<Ident>) {
+    fn clean(&self, cx: &DocContext<'_>) -> Vec<Item> {
         use hir::ItemKind;
 
         let (item, renamed) = self;
@@ -1977,10 +1976,11 @@ impl Clean<Item> for (&hir::Item<'_>, Option<Ident>) {
                 fields: variant_data.fields().clean(cx),
                 fields_stripped: false,
             }),
+            ItemKind::Impl { .. } => return clean_impl(item, cx),
             _ => unreachable!("not yet converted"),
         };
 
-        Item::from_def_id_and_parts(def_id, Some(name), kind, cx)
+        vec![Item::from_def_id_and_parts(def_id, Some(name), kind, cx)]
     }
 }
 
@@ -2005,57 +2005,53 @@ impl Clean<ImplPolarity> for ty::ImplPolarity {
     }
 }
 
-impl Clean<Vec<Item>> for doctree::Impl<'_> {
-    fn clean(&self, cx: &DocContext<'_>) -> Vec<Item> {
-        let mut ret = Vec::new();
-        let trait_ = self.trait_.clean(cx);
-        let items = self.items.iter().map(|ii| ii.clean(cx)).collect::<Vec<_>>();
-        let def_id = cx.tcx.hir().local_def_id(self.id);
-
-        // If this impl block is an implementation of the Deref trait, then we
-        // need to try inlining the target's inherent impl blocks as well.
-        if trait_.def_id() == cx.tcx.lang_items().deref_trait() {
-            build_deref_target_impls(cx, &items, &mut ret);
+fn clean_impl(impl_: &hir::Item<'_>, cx: &DocContext<'_>) -> Vec<Item> {
+    let mut ret = Vec::new();
+    let (trait_, items, for_, unsafety, generics) = match &impl_.kind {
+        hir::ItemKind::Impl { of_trait, items, self_ty, unsafety, generics, .. } => {
+            (of_trait, items, self_ty, *unsafety, generics)
         }
-
-        let provided: FxHashSet<String> = trait_
-            .def_id()
-            .map(|did| {
-                cx.tcx.provided_trait_methods(did).map(|meth| meth.ident.to_string()).collect()
-            })
-            .unwrap_or_default();
-
-        let for_ = self.for_.clean(cx);
-        let type_alias = for_.def_id().and_then(|did| match cx.tcx.def_kind(did) {
-            DefKind::TyAlias => Some(cx.tcx.type_of(did).clean(cx)),
-            _ => None,
+        _ => unreachable!(),
+    };
+    let trait_ = trait_.clean(cx);
+    let items = items.iter().map(|ii| cx.tcx.hir().impl_item(ii.id).clean(cx)).collect::<Vec<_>>();
+    let def_id = cx.tcx.hir().local_def_id(impl_.hir_id);
+
+    // If this impl block is an implementation of the Deref trait, then we
+    // need to try inlining the target's inherent impl blocks as well.
+    if trait_.def_id() == cx.tcx.lang_items().deref_trait() {
+        build_deref_target_impls(cx, &items, &mut ret);
+    }
+
+    let provided: FxHashSet<String> = trait_
+        .def_id()
+        .map(|did| cx.tcx.provided_trait_methods(did).map(|meth| meth.ident.to_string()).collect())
+        .unwrap_or_default();
+
+    let for_ = for_.clean(cx);
+    let type_alias = for_.def_id().and_then(|did| match cx.tcx.def_kind(did) {
+        DefKind::TyAlias => Some(cx.tcx.type_of(did).clean(cx)),
+        _ => None,
+    });
+    let make_item = |trait_: Option<Type>, for_: Type, items: Vec<Item>| {
+        let kind = ImplItem(Impl {
+            unsafety,
+            generics: generics.clean(cx),
+            provided_trait_methods: provided.clone(),
+            trait_,
+            for_,
+            items,
+            polarity: Some(cx.tcx.impl_polarity(def_id).clean(cx)),
+            synthetic: false,
+            blanket_impl: None,
         });
-        let make_item = |trait_: Option<Type>, for_: Type, items: Vec<Item>| Item {
-            name: None,
-            attrs: self.attrs.clean(cx),
-            source: self.span.clean(cx),
-            def_id: def_id.to_def_id(),
-            visibility: self.vis.clean(cx),
-            stability: cx.stability(self.id),
-            deprecation: cx.deprecation(self.id).clean(cx),
-            kind: ImplItem(Impl {
-                unsafety: self.unsafety,
-                generics: self.generics.clean(cx),
-                provided_trait_methods: provided.clone(),
-                trait_,
-                for_,
-                items,
-                polarity: Some(cx.tcx.impl_polarity(def_id).clean(cx)),
-                synthetic: false,
-                blanket_impl: None,
-            }),
-        };
-        if let Some(type_alias) = type_alias {
-            ret.push(make_item(trait_.clone(), type_alias, items.clone()));
-        }
-        ret.push(make_item(trait_, for_, items));
-        ret
+        Item::from_hir_id_and_parts(impl_.hir_id, None, kind, cx)
+    };
+    if let Some(type_alias) = type_alias {
+        ret.push(make_item(trait_.clone(), type_alias, items.clone()));
     }
+    ret.push(make_item(trait_, for_, items));
+    ret
 }
 
 impl Clean<Vec<Item>> for doctree::ExternCrate<'_> {

src/librustdoc/core.rs

@@ -1,4 +1,3 @@
-use rustc_attr as attr;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{self, Lrc};
 use rustc_driver::abort_on_err;
@@ -156,21 +155,6 @@ impl<'tcx> DocContext<'tcx> {
             def_id.as_local().map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id))
         }
     }
-
-    crate fn stability(&self, id: HirId) -> Option<attr::Stability> {
-        self.tcx
-            .hir()
-            .opt_local_def_id(id)
-            .and_then(|def_id| self.tcx.lookup_stability(def_id.to_def_id()))
-            .cloned()
-    }
-
-    crate fn deprecation(&self, id: HirId) -> Option<attr::Deprecation> {
-        self.tcx
-            .hir()
-            .opt_local_def_id(id)
-            .and_then(|def_id| self.tcx.lookup_deprecation(def_id.to_def_id()))
-    }
 }
 
 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.

src/librustdoc/doctree.rs

@@ -23,7 +23,6 @@ crate struct Module<'hir> {
     // (item, renamed)
     crate items: Vec<(&'hir hir::Item<'hir>, Option<Ident>)>,
     crate traits: Vec<Trait<'hir>>,
-    crate impls: Vec<Impl<'hir>>,
     crate foreigns: Vec<ForeignItem<'hir>>,
     crate macros: Vec<Macro>,
     crate proc_macros: Vec<ProcMacro>,
@@ -44,7 +43,6 @@ impl Module<'hir> {
             mods: Vec::new(),
             items: Vec::new(),
             traits: Vec::new(),
-            impls: Vec::new(),
             foreigns: Vec::new(),
             macros: Vec::new(),
             proc_macros: Vec::new(),
@@ -89,22 +87,6 @@ crate struct Trait<'hir> {
     crate id: hir::HirId,
 }
 
-#[derive(Debug)]
-crate struct Impl<'hir> {
-    crate unsafety: hir::Unsafety,
-    crate polarity: hir::ImplPolarity,
-    crate defaultness: hir::Defaultness,
-    crate constness: hir::Constness,
-    crate generics: &'hir hir::Generics<'hir>,
-    crate trait_: &'hir Option<hir::TraitRef<'hir>>,
-    crate for_: &'hir hir::Ty<'hir>,
-    crate items: Vec<&'hir hir::ImplItem<'hir>>,
-    crate attrs: &'hir [ast::Attribute],
-    crate span: Span,
-    crate vis: &'hir hir::Visibility<'hir>,
-    crate id: hir::HirId,
-}
-
 crate struct ForeignItem<'hir> {
     crate id: hir::HirId,
     crate name: Symbol,

src/librustdoc/visit_ast.rs

@@ -401,37 +401,11 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                 };
                 om.traits.push(t);
             }
-            hir::ItemKind::Impl {
-                unsafety,
-                polarity,
-                defaultness,
-                constness,
-                defaultness_span: _,
-                ref generics,
-                ref of_trait,
-                self_ty,
-                ref items,
-            } => {
+            hir::ItemKind::Impl { ref of_trait, .. } => {
                 // Don't duplicate impls when inlining or if it's implementing a trait, we'll pick
                 // them up regardless of where they're located.
                 if !self.inlining && of_trait.is_none() {
-                    let items =
-                        items.iter().map(|item| self.cx.tcx.hir().impl_item(item.id)).collect();
-                    let i = Impl {
-                        unsafety,
-                        polarity,
-                        defaultness,
-                        constness,
-                        generics,
-                        trait_: of_trait,
-                        for_: self_ty,
-                        items,
-                        attrs: &item.attrs,
-                        id: item.hir_id,
-                        span: item.span,
-                        vis: &item.vis,
-                    };
-                    om.impls.push(i);
+                    om.items.push((item, None));
                 }
             }
         }

src/test/rustdoc-ui/intra-link-errors.stderr

@@ -106,6 +106,15 @@ LL | /// [S!]
    |      this link resolves to the struct `S`, which is not in the macro namespace
    |      help: to link to the struct, prefix with `struct@`: `struct@S`
 
+error: unresolved link to `S::h`
+  --> $DIR/intra-link-errors.rs:78:6
+   |
+LL | /// [type@S::h]
+   |      ^^^^^^^^^
+   |      |
+   |      this link resolves to the associated function `h`, which is not in the type namespace
+   |      help: to link to the associated function, add parentheses: `S::h()`
+
 error: unresolved link to `T::g`
   --> $DIR/intra-link-errors.rs:86:6
    |
@@ -121,15 +130,6 @@ error: unresolved link to `T::h`
 LL | /// [T::h!]
    |      ^^^^^ the trait `T` has no macro named `h`
 
-error: unresolved link to `S::h`
-  --> $DIR/intra-link-errors.rs:78:6
-   |
-LL | /// [type@S::h]
-   |      ^^^^^^^^^
-   |      |
-   |      this link resolves to the associated function `h`, which is not in the type namespace
-   |      help: to link to the associated function, add parentheses: `S::h()`
-
 error: unresolved link to `m`
   --> $DIR/intra-link-errors.rs:98:6
    |