Don't share id_map and deref_id_map

src/librustdoc/html/render/mod.rs

@@ -110,6 +110,11 @@ crate struct Context<'tcx> {
     /// real location of an item. This is used to allow external links to
     /// publicly reused items to redirect to the right location.
     render_redirect_pages: bool,
+    /// The map used to ensure all generated 'id=' attributes are unique.
+    id_map: RefCell<IdMap>,
+    /// Tracks section IDs for `Deref` targets so they match in both the main
+    /// body and the sidebar.
+    deref_id_map: RefCell<FxHashMap<DefId, String>>,
     /// Shared mutable state.
     ///
     /// Issue for improving the situation: [#82381][]
@@ -130,7 +135,7 @@ crate struct Context<'tcx> {
 
 // `Context` is cloned a lot, so we don't want the size to grow unexpectedly.
 #[cfg(target_arch = "x86_64")]
-rustc_data_structures::static_assert_size!(Context<'_>, 72);
+rustc_data_structures::static_assert_size!(Context<'_>, 152);
 
 /// Shared mutable state used in [`Context`] and elsewhere.
 crate struct SharedContext<'tcx> {
@@ -172,11 +177,6 @@ crate struct SharedContext<'tcx> {
     crate edition: Edition,
     codes: ErrorCodes,
     playground: Option<markdown::Playground>,
-    /// The map used to ensure all generated 'id=' attributes are unique.
-    id_map: RefCell<IdMap>,
-    /// Tracks section IDs for `Deref` targets so they match in both the main
-    /// body and the sidebar.
-    deref_id_map: RefCell<FxHashMap<DefId, String>>,
     all: RefCell<AllTypes>,
     /// Storage for the errors produced while generating documentation so they
     /// can be printed together at the end.
@@ -496,8 +496,6 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             edition,
             codes: ErrorCodes::from(unstable_features.is_nightly_build()),
             playground,
-            id_map: RefCell::new(id_map),
-            deref_id_map: RefCell::new(FxHashMap::default()),
             all: RefCell::new(AllTypes::new()),
             errors: receiver,
         };
@@ -526,6 +524,8 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             current: Vec::new(),
             dst,
             render_redirect_pages: false,
+            id_map: RefCell::new(id_map),
+            deref_id_map: RefCell::new(FxHashMap::default()),
             shared: Rc::new(scx),
             cache: Rc::new(cache),
         };
@@ -1535,7 +1535,7 @@ fn settings(root_path: &str, suffix: &str, themes: &[StylePath]) -> Result<Strin
 
 impl Context<'_> {
     fn derive_id(&self, id: String) -> String {
-        let mut map = self.shared.id_map.borrow_mut();
+        let mut map = self.id_map.borrow_mut();
         map.derive(id)
     }
 
@@ -1590,8 +1590,9 @@ impl Context<'_> {
         };
 
         {
-            self.shared.id_map.borrow_mut().reset();
-            self.shared.id_map.borrow_mut().populate(&INITIAL_IDS);
+            // FIXME: remove this once `Context` is no longer cloned
+            self.id_map.borrow_mut().reset();
+            self.id_map.borrow_mut().populate(&INITIAL_IDS);
         }
 
         if !self.render_redirect_pages {
@@ -1859,7 +1860,7 @@ fn render_markdown(
     prefix: &str,
     is_hidden: bool,
 ) {
-    let mut ids = cx.shared.id_map.borrow_mut();
+    let mut ids = cx.id_map.borrow_mut();
     write!(
         w,
         "<div class=\"docblock{}\">{}{}</div>",
@@ -2337,7 +2338,7 @@ fn short_item_info(
 
         if let Some(note) = note {
             let note = note.as_str();
-            let mut ids = cx.shared.id_map.borrow_mut();
+            let mut ids = cx.id_map.borrow_mut();
             let html = MarkdownHtml(
                 &note,
                 &mut ids,
@@ -2376,7 +2377,7 @@ fn short_item_info(
         message.push_str(&format!(" ({})", feature));
 
         if let Some(unstable_reason) = reason {
-            let mut ids = cx.shared.id_map.borrow_mut();
+            let mut ids = cx.id_map.borrow_mut();
             message = format!(
                 "<details><summary>{}</summary>{}</details>",
                 message,
@@ -3531,8 +3532,7 @@ fn render_assoc_items(
                     type_.print(cx.cache())
                 )));
                 debug!("Adding {} to deref id map", type_.print(cx.cache()));
-                cx.shared
-                    .deref_id_map
+                cx.deref_id_map
                     .borrow_mut()
                     .insert(type_.def_id_full(cx.cache()).unwrap(), id.clone());
                 write!(
@@ -3838,7 +3838,7 @@ fn render_impl(
         }
 
         if let Some(ref dox) = cx.shared.maybe_collapsed_doc_value(&i.impl_item) {
-            let mut ids = cx.shared.id_map.borrow_mut();
+            let mut ids = cx.id_map.borrow_mut();
             write!(
                 w,
                 "<div class=\"docblock\">{}</div>",
@@ -4467,7 +4467,7 @@ fn sidebar_deref_methods(cx: &Context<'_>, out: &mut Buffer, impl_: &Impl, v: &V
                 .flat_map(|i| get_methods(i.inner_impl(), true, &mut used_links, deref_mut, c))
                 .collect::<Vec<_>>();
             if !ret.is_empty() {
-                let deref_id_map = cx.shared.deref_id_map.borrow();
+                let deref_id_map = cx.deref_id_map.borrow();
                 let id = deref_id_map
                     .get(&real_target.def_id_full(cx.cache()).unwrap())
                     .expect("Deref section without derived id");