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diff --git a/gcc/diagnostics/selftest-logical-locations.cc b/gcc/diagnostics/selftest-logical-locations.cc
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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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "selftest.h"
+#include "diagnostics/selftest-logical-locations.h"
+
+#if CHECKING_P
+
+namespace diagnostics {
+namespace logical_locations {
+namespace selftest {
+
+/* class test_manager : public manager.  */
+
+test_manager::~test_manager ()
+{
+  for (auto iter : m_name_to_item_map)
+    delete iter.second;
+}
+
+const char *
+test_manager::get_short_name (key k) const
+{
+  auto item = item_from_key (k);
+  if (!item)
+    return nullptr;
+  return item->m_name;
+}
+
+const char *
+test_manager::get_name_with_scope (key k) const
+{
+  auto item = item_from_key (k);
+  return item->m_name;
+}
+
+const char *
+test_manager::get_internal_name (key k) const
+{
+  auto item = item_from_key (k);
+  return item->m_name;
+}
+
+enum diagnostics::logical_locations::kind
+test_manager::get_kind (key k) const
+{
+  auto item = item_from_key (k);
+  return item->m_kind;
+}
+
+label_text
+test_manager::get_name_for_path_output (key k) const
+{
+  auto item = item_from_key (k);
+  return label_text::borrow (item->m_name);
+}
+
+diagnostics::logical_locations::key
+test_manager::
+logical_location_from_funcname (const char *funcname)
+{
+  const item *i = item_from_funcname (funcname);
+  return key::from_ptr (i);
+}
+
+const test_manager::item *
+test_manager::item_from_funcname (const char *funcname)
+{
+  if (!funcname)
+    return nullptr;
+
+  if (item **slot = m_name_to_item_map.get (funcname))
+    return *slot;
+
+  item *i = new item (kind::function, funcname);
+  m_name_to_item_map.put (funcname, i);
+  return i;
+}
+
+/* Run all of the selftests within this file.  */
+
+void
+selftest_logical_locations_cc_tests ()
+{
+  test_manager mgr;
+
+  ASSERT_FALSE (mgr.logical_location_from_funcname (nullptr));
+
+  key loc_foo = mgr.logical_location_from_funcname ("foo");
+  key loc_bar = mgr.logical_location_from_funcname ("bar");
+
+  ASSERT_NE (loc_foo, loc_bar);
+
+  ASSERT_STREQ (mgr.get_short_name (loc_foo), "foo");
+  ASSERT_STREQ (mgr.get_short_name (loc_bar), "bar");
+}
+
+} // namespace diagnostics::logical_locations::selftest
+} // namespace diagnostics::logical_locations
+} // namespace diagnostics
+
+#endif /* #if CHECKING_P */