================
@@ -3073,14 +3073,43 @@ 
SymbolFileDWARF::FindDefinitionTypeForDWARFDeclContext(const DWARFDIE &die) {
 
     // See comments below about -gsimple-template-names for why we attempt to
     // compute missing template parameter names.
-    ConstString template_params;
-    if (type_system) {
-      DWARFASTParser *dwarf_ast = type_system->GetDWARFParser();
-      if (dwarf_ast)
-        template_params = dwarf_ast->GetDIEClassTemplateParams(die);
+    std::vector<std::string> template_params;
+    DWARFDeclContext die_dwarf_decl_ctx;
+    DWARFASTParser *dwarf_ast = type_system ? type_system->GetDWARFParser() : 
nullptr;
+    for (DWARFDIE ctx_die = die; ctx_die && !isUnitType(ctx_die.Tag());
+         ctx_die = ctx_die.GetParentDeclContextDIE()) {
+      die_dwarf_decl_ctx.AppendDeclContext(ctx_die.Tag(), ctx_die.GetName());
+      template_params.push_back(
+          (ctx_die.IsStructUnionOrClass() && dwarf_ast)
+              ? dwarf_ast->GetDIEClassTemplateParams(ctx_die)
+              : "");
     }
+    const bool any_template_params = llvm::any_of(
+        template_params, [](llvm::StringRef p) { return !p.empty(); });
 
-    const DWARFDeclContext die_dwarf_decl_ctx = die.GetDWARFDeclContext();
+    auto die_matches = [&](DWARFDIE type_die) {
+      // Resolve the type if both have the same tag or {class, struct} tags.
+      const bool tag_matches =
+          type_die.Tag() == tag ||
+          (IsStructOrClassTag(type_die.Tag()) && IsStructOrClassTag(tag));
----------------
Michael137 wrote:

> they matter for creation of clang asts

FWIW, we do disable the main distinction (access control) between the two in 
the AST. But fair point, there might be other places that care, not sure off 
the top of my head.

>  would be to have a sort of a getCanonicalTag() which maps structure_type to 
> class_type (or the other way around), and then do these comparisons on the 
> "canonical" tags.

Good idea!

https://github.com/llvm/llvm-project/pull/95905
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