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diff --git a/gcc/diagnostics/selftest-logical-locations.h b/gcc/diagnostics/selftest-logical-locations.h
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+/* Concrete subclass of logical_locations::manager for use in selftests.
+   Copyright (C) 2024-2025 Free Software Foundation, Inc.
+   Contributed by David Malcolm <dmalcolm@redhat.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_DIAGNOSTICS_SELFTEST_LOGICAL_LOCATIONS_H
+#define GCC_DIAGNOSTICS_SELFTEST_LOGICAL_LOCATIONS_H
+
+#include "diagnostics/logical-locations.h"
+
+/* The selftest code should entirely disappear in a production
+   configuration, hence we guard all of it with #if CHECKING_P.  */
+
+#if CHECKING_P
+
+namespace diagnostics {
+namespace logical_locations {
+namespace selftest {
+
+/* Concrete subclass of logical_locations::manager for use in selftests.  */
+
+class test_manager : public manager
+{
+public:
+  ~test_manager ();
+
+  const char *get_short_name (key) const final override;
+  const char *get_name_with_scope (key) const final override;
+  const char *get_internal_name (key) const final override;
+  kind get_kind (key) const final override;
+  label_text get_name_for_path_output (key) const final override;
+  key get_parent (key) const final override
+  {
+    return key ();
+  }
+
+  key
+  logical_location_from_funcname (const char *funcname);
+
+private:
+  struct item
+  {
+    item (kind kind_,
+	  const char *name)
+    : m_kind (kind_),
+      m_name (name)
+    {
+    }
+
+    kind m_kind;
+    const char *m_name;
+  };
+
+  const item *
+  item_from_funcname (const char *funcname);
+
+  static const item *item_from_key (key k)
+  {
+    return k.cast_to<const item *> ();
+  }
+
+  hash_map<nofree_string_hash, item *> m_name_to_item_map;
+};
+
+} // namespace diagnostics::logical_locations::selftest
+} // namespace diagnostics::logical_locations::
+} // namespace diagnostics
+
+#endif /* #if CHECKING_P */
+
+#endif /* GCC_DIAGNOSTICS_SELFTEST_LOGICAL_LOCATIONS_H.  */