debuginfo for FRTs

Author: BennoLossin

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -454,9 +454,6 @@ pub(crate) fn spanned_type_di_node<'ll, 'tcx>(
  ty::RawPtr(pointee_type, _) | ty::Ref(_, pointee_type, _) => {
  build_pointer_or_reference_di_node(cx, t, pointee_type, unique_type_id)
  }
- // Some `Box` are newtyped pointers, make debuginfo aware of that.
- // Only works if the allocator argument is a 1-ZST and hence irrelevant for layout
- // (or if there is no allocator argument).
  ty::Adt(def, args)
  if def.is_box()
  && args.get(1).is_none_or(|arg| cx.layout_of(arg.expect_ty()).is_1zst()) =>
@@ -473,6 +470,7 @@ pub(crate) fn spanned_type_di_node<'ll, 'tcx>(
  AdtKind::Enum => enums::build_enum_type_di_node(cx, unique_type_id, span),
  },
  ty::Tuple(_) => build_tuple_type_di_node(cx, unique_type_id),
+ ty::Field(..) => build_field_type_di_node(cx, unique_type_id),
  _ => bug!("debuginfo: unexpected type in type_di_node(): {:?}", t),
  };
 
@@ -1261,6 +1259,32 @@ fn build_closure_env_di_node<'ll, 'tcx>(
  )
 }
 
+fn build_field_type_di_node<'ll, 'tcx>(
+ cx: &CodegenCx<'ll, 'tcx>,
+ unique_type_id: UniqueTypeId<'tcx>,
+) -> DINodeCreationResult<'ll> {
+ let ty = unique_type_id.expect_ty();
+ let ty::Field(_, _) = ty.kind() else {
+ bug!("build_field_type_di_node() called with non-field-type: {ty:?}")
+ };
+ let type_name = compute_debuginfo_type_name(cx.tcx, ty, false);
+ type_map::build_type_with_children(
+ cx,
+ type_map::stub(
+ cx,
+ Stub::Struct,
+ unique_type_id,
+ &type_name,
+ None,
+ cx.size_and_align_of(ty),
+ None,
+ DIFlags::FlagZero,
+ ),
+ |_, _| smallvec![],
+ NO_GENERICS,
+ )
+}
+
 /// Build the debuginfo node for a Rust `union` type.
 fn build_union_type_di_node<'ll, 'tcx>(
  cx: &CodegenCx<'ll, 'tcx>,