From 2ff14448863ac1a1dd9533461708e29aae170c2d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:06:31 +0200
Subject: Adding debian version 1.65.0+dfsg1-2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/librustdoc/passes/propagate_doc_cfg.rs | 62 +++++++++++++++++++++++++++---
 1 file changed, 57 insertions(+), 5 deletions(-)

(limited to 'src/librustdoc/passes/propagate_doc_cfg.rs')

diff --git a/src/librustdoc/passes/propagate_doc_cfg.rs b/src/librustdoc/passes/propagate_doc_cfg.rs
index 0c5d83655..765f7c61b 100644
--- a/src/librustdoc/passes/propagate_doc_cfg.rs
+++ b/src/librustdoc/passes/propagate_doc_cfg.rs
@@ -2,29 +2,74 @@
 use std::sync::Arc;
 
 use crate::clean::cfg::Cfg;
-use crate::clean::{Crate, Item};
+use crate::clean::inline::{load_attrs, merge_attrs};
+use crate::clean::{Crate, Item, ItemKind};
 use crate::core::DocContext;
 use crate::fold::DocFolder;
 use crate::passes::Pass;
 
+use rustc_hir::def_id::LocalDefId;
+
 pub(crate) const PROPAGATE_DOC_CFG: Pass = Pass {
     name: "propagate-doc-cfg",
     run: propagate_doc_cfg,
     description: "propagates `#[doc(cfg(...))]` to child items",
 };
 
-pub(crate) fn propagate_doc_cfg(cr: Crate, _: &mut DocContext<'_>) -> Crate {
-    CfgPropagator { parent_cfg: None }.fold_crate(cr)
+pub(crate) fn propagate_doc_cfg(cr: Crate, cx: &mut DocContext<'_>) -> Crate {
+    CfgPropagator { parent_cfg: None, parent: None, cx }.fold_crate(cr)
 }
 
-struct CfgPropagator {
+struct CfgPropagator<'a, 'tcx> {
     parent_cfg: Option<Arc<Cfg>>,
+    parent: Option<LocalDefId>,
+    cx: &'a mut DocContext<'tcx>,
+}
+
+impl<'a, 'tcx> CfgPropagator<'a, 'tcx> {
+    // Some items need to merge their attributes with their parents' otherwise a few of them
+    // (mostly `cfg` ones) will be missing.
+    fn merge_with_parent_attributes(&mut self, item: &mut Item) {
+        let check_parent = match &*item.kind {
+            // impl blocks can be in different modules with different cfg and we need to get them
+            // as well.
+            ItemKind::ImplItem(_) => false,
+            kind if kind.is_non_assoc() => true,
+            _ => return,
+        };
+
+        let Some(def_id) = item.item_id.as_def_id().and_then(|def_id| def_id.as_local())
+            else { return };
+
+        let hir = self.cx.tcx.hir();
+        let hir_id = hir.local_def_id_to_hir_id(def_id);
+
+        if check_parent {
+            let expected_parent = hir.get_parent_item(hir_id);
+            // If parents are different, it means that `item` is a reexport and we need
+            // to compute the actual `cfg` by iterating through its "real" parents.
+            if self.parent == Some(expected_parent) {
+                return;
+            }
+        }
+
+        let mut attrs = Vec::new();
+        for (parent_hir_id, _) in hir.parent_iter(hir_id) {
+            if let Some(def_id) = hir.opt_local_def_id(parent_hir_id) {
+                attrs.extend_from_slice(load_attrs(self.cx, def_id.to_def_id()));
+            }
+        }
+        let (_, cfg) = merge_attrs(self.cx, None, item.attrs.other_attrs.as_slice(), Some(&attrs));
+        item.cfg = cfg;
+    }
 }
 
-impl DocFolder for CfgPropagator {
+impl<'a, 'tcx> DocFolder for CfgPropagator<'a, 'tcx> {
     fn fold_item(&mut self, mut item: Item) -> Option<Item> {
         let old_parent_cfg = self.parent_cfg.clone();
 
+        self.merge_with_parent_attributes(&mut item);
+
         let new_cfg = match (self.parent_cfg.take(), item.cfg.take()) {
             (None, None) => None,
             (Some(rc), None) | (None, Some(rc)) => Some(rc),
@@ -37,8 +82,15 @@ impl DocFolder for CfgPropagator {
         self.parent_cfg = new_cfg.clone();
         item.cfg = new_cfg;
 
+        let old_parent =
+            if let Some(def_id) = item.item_id.as_def_id().and_then(|def_id| def_id.as_local()) {
+                self.parent.replace(def_id)
+            } else {
+                self.parent.take()
+            };
         let result = self.fold_item_recur(item);
         self.parent_cfg = old_parent_cfg;
+        self.parent = old_parent;
 
         Some(result)
     }
-- 
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