1 files changed, 98 insertions, 1 deletions
diff --git a/src/librustdoc/json/conversions.rs b/src/librustdoc/json/conversions.rs
index e7163bead92..0a84d8caa30 100644
--- a/src/librustdoc/json/conversions.rs
+++ b/src/librustdoc/json/conversions.rs
@@ -5,10 +5,12 @@
 use rustc_abi::ExternAbi;
 use rustc_ast::ast;
 use rustc_attr_data_structures::{self as attrs, DeprecatedSince};
+use rustc_hir as hir;
 use rustc_hir::def::CtorKind;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{HeaderSafety, Safety};
 use rustc_metadata::rendered_const;
+use rustc_middle::ty::TyCtxt;
 use rustc_middle::{bug, ty};
 use rustc_span::{Pos, kw, sym};
 use rustdoc_json_types::*;
@@ -39,7 +41,12 @@ impl JsonRenderer<'_> {
             })
             .collect();
         let docs = item.opt_doc_value();
-        let attrs = item.attributes(self.tcx, &self.cache, true);
+        let attrs = item
+            .attrs
+            .other_attrs
+            .iter()
+            .filter_map(|a| maybe_from_hir_attr(a, item.item_id, self.tcx))
+            .collect();
         let span = item.span(self.tcx);
         let visibility = item.visibility(self.tcx);
         let clean::ItemInner { name, item_id, .. } = *item.inner;
@@ -886,3 +893,93 @@ impl FromClean<ItemType> for ItemKind {
         }
     }
 }
+
+/// Maybe convert a attribute from hir to json.
+///
+/// Returns `None` if the attribute shouldn't be in the output.
+fn maybe_from_hir_attr(
+    attr: &hir::Attribute,
+    item_id: ItemId,
+    tcx: TyCtxt<'_>,
+) -> Option<Attribute> {
+    use attrs::AttributeKind as AK;
+
+    let kind = match attr {
+        hir::Attribute::Parsed(kind) => kind,
+
+        hir::Attribute::Unparsed(_) => {
+            // FIXME: We should handle `#[doc(hidden)]`.
+            return Some(other_attr(tcx, attr));
+        }
+    };
+
+    Some(match kind {
+        AK::Deprecation { .. } => return None, // Handled separately into Item::deprecation.
+        AK::DocComment { .. } => unreachable!("doc comments stripped out earlier"),
+
+        AK::MustUse { reason, span: _ } => {
+            Attribute::MustUse { reason: reason.map(|s| s.to_string()) }
+        }
+        AK::Repr { .. } => repr_attr(
+            tcx,
+            item_id.as_def_id().expect("all items that could have #[repr] have a DefId"),
+        ),
+        AK::ExportName { name, span: _ } => Attribute::ExportName(name.to_string()),
+        AK::LinkSection { name, span: _ } => Attribute::LinkSection(name.to_string()),
+        AK::TargetFeature(features, _span) => Attribute::TargetFeature {
+            enable: features.iter().map(|(feat, _span)| feat.to_string()).collect(),
+        },
+
+        AK::NoMangle(_) => Attribute::NoMangle,
+        AK::NonExhaustive(_) => Attribute::NonExhaustive,
+        AK::AutomaticallyDerived(_) => Attribute::AutomaticallyDerived,
+
+        _ => other_attr(tcx, attr),
+    })
+}
+
+fn other_attr(tcx: TyCtxt<'_>, attr: &hir::Attribute) -> Attribute {
+    let mut s = rustc_hir_pretty::attribute_to_string(&tcx, attr);
+    assert_eq!(s.pop(), Some('\n'));
+    Attribute::Other(s)
+}
+
+fn repr_attr(tcx: TyCtxt<'_>, def_id: DefId) -> Attribute {
+    let repr = tcx.adt_def(def_id).repr();
+
+    let kind = if repr.c() {
+        ReprKind::C
+    } else if repr.transparent() {
+        ReprKind::Transparent
+    } else if repr.simd() {
+        ReprKind::Simd
+    } else {
+        ReprKind::Rust
+    };
+
+    let align = repr.align.map(|a| a.bytes());
+    let packed = repr.pack.map(|p| p.bytes());
+    let int = repr.int.map(format_integer_type);
+
+    Attribute::Repr(AttributeRepr { kind, align, packed, int })
+}
+
+fn format_integer_type(it: rustc_abi::IntegerType) -> String {
+    use rustc_abi::Integer::*;
+    use rustc_abi::IntegerType::*;
+    match it {
+        Pointer(true) => "isize",
+        Pointer(false) => "usize",
+        Fixed(I8, true) => "i8",
+        Fixed(I8, false) => "u8",
+        Fixed(I16, true) => "i16",
+        Fixed(I16, false) => "u16",
+        Fixed(I32, true) => "i32",
+        Fixed(I32, false) => "u32",
+        Fixed(I64, true) => "i64",
+        Fixed(I64, false) => "u64",
+        Fixed(I128, true) => "i128",
+        Fixed(I128, false) => "u128",
+    }
+    .to_owned()
+}