compiler: Include span of too huge enum with -Cdebuginfo=2

We have a ui test to ensure we emit an error if we encounter too big
enums. Before this fix, compiling the test with `-Cdebuginfo=2` would
not include the span of the instantiation site, because the error is
then emitted from a different code path that does not include the span.

Propagate the span to the error also in the debuginfo case, so the test
passes regardless of debuginfo level.

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -19,7 +19,9 @@ use rustc_middle::ty::{
     self, AdtKind, CoroutineArgsExt, ExistentialTraitRef, Instance, Ty, TyCtxt, Visibility,
 };
 use rustc_session::config::{self, DebugInfo, Lto};
-use rustc_span::{DUMMY_SP, FileName, FileNameDisplayPreference, SourceFile, Symbol, hygiene};
+use rustc_span::{
+    DUMMY_SP, FileName, FileNameDisplayPreference, SourceFile, Span, Symbol, hygiene,
+};
 use rustc_symbol_mangling::typeid_for_trait_ref;
 use rustc_target::spec::DebuginfoKind;
 use smallvec::smallvec;
@@ -423,6 +425,14 @@ fn build_slice_type_di_node<'ll, 'tcx>(
 /// This function will look up the debuginfo node in the TypeMap. If it can't find it, it
 /// will create the node by dispatching to the corresponding `build_*_di_node()` function.
 pub(crate) fn type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) -> &'ll DIType {
+    spanned_type_di_node(cx, t, DUMMY_SP)
+}
+
+pub(crate) fn spanned_type_di_node<'ll, 'tcx>(
+    cx: &CodegenCx<'ll, 'tcx>,
+    t: Ty<'tcx>,
+    span: Span,
+) -> &'ll DIType {
     let unique_type_id = UniqueTypeId::for_ty(cx.tcx, t);
 
     if let Some(existing_di_node) = debug_context(cx).type_map.di_node_for_unique_id(unique_type_id)
@@ -460,7 +470,7 @@ pub(crate) fn type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) ->
         ty::Adt(def, ..) => match def.adt_kind() {
             AdtKind::Struct => build_struct_type_di_node(cx, unique_type_id),
             AdtKind::Union => build_union_type_di_node(cx, unique_type_id),
-            AdtKind::Enum => enums::build_enum_type_di_node(cx, unique_type_id),
+            AdtKind::Enum => enums::build_enum_type_di_node(cx, unique_type_id, span),
         },
         ty::Tuple(_) => build_tuple_type_di_node(cx, unique_type_id),
         _ => bug!("debuginfo: unexpected type in type_di_node(): {:?}", t),

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/mod.rs

@@ -10,7 +10,7 @@ use rustc_middle::bug;
 use rustc_middle::mir::CoroutineLayout;
 use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, AdtDef, CoroutineArgs, CoroutineArgsExt, Ty, VariantDef};
-use rustc_span::Symbol;
+use rustc_span::{Span, Symbol};
 
 use super::type_map::{DINodeCreationResult, UniqueTypeId};
 use super::{SmallVec, size_and_align_of};
@@ -30,13 +30,14 @@ mod native;
 pub(super) fn build_enum_type_di_node<'ll, 'tcx>(
     cx: &CodegenCx<'ll, 'tcx>,
     unique_type_id: UniqueTypeId<'tcx>,
+    span: Span,
 ) -> DINodeCreationResult<'ll> {
     let enum_type = unique_type_id.expect_ty();
     let &ty::Adt(enum_adt_def, _) = enum_type.kind() else {
         bug!("build_enum_type_di_node() called with non-enum type: `{:?}`", enum_type)
     };
 
-    let enum_type_and_layout = cx.layout_of(enum_type);
+    let enum_type_and_layout = cx.spanned_layout_of(enum_type, span);
 
     if wants_c_like_enum_debuginfo(cx.tcx, enum_type_and_layout) {
         return build_c_style_enum_di_node(cx, enum_adt_def, enum_type_and_layout);

compiler/rustc_codegen_llvm/src/debuginfo/mod.rs

@@ -28,7 +28,9 @@ use rustc_target::spec::DebuginfoKind;
 use smallvec::SmallVec;
 use tracing::debug;
 
-use self::metadata::{UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER, file_metadata, type_di_node};
+use self::metadata::{
+    UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER, file_metadata, spanned_type_di_node, type_di_node,
+};
 use self::namespace::mangled_name_of_instance;
 use self::utils::{DIB, create_DIArray, is_node_local_to_unit};
 use crate::builder::Builder;
@@ -626,7 +628,7 @@ impl<'ll, 'tcx> DebugInfoCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         let loc = self.lookup_debug_loc(span.lo());
         let file_metadata = file_metadata(self, &loc.file);
 
-        let type_metadata = type_di_node(self, variable_type);
+        let type_metadata = spanned_type_di_node(self, variable_type, span);
 
         let (argument_index, dwarf_tag) = match variable_kind {
             ArgumentVariable(index) => (index as c_uint, DW_TAG_arg_variable),