--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/diagnostic-metadata.h	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,42 @@
+/* Additional metadata for a diagnostic.
+   Copyright (C) 2019-2020 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_DIAGNOSTIC_METADATA_H
+#define GCC_DIAGNOSTIC_METADATA_H
+
+/* A bundle of additional metadata that can be associated with a
+   diagnostic.
+
+   Currently this only supports associating a CWE identifier with a
+   diagnostic.  */
+
+class diagnostic_metadata
+{
+ public:
+  diagnostic_metadata () : m_cwe (0) {}
+
+  void add_cwe (int cwe) { m_cwe = cwe; }
+  int get_cwe () const { return m_cwe; }
+
+ private:
+  int m_cwe;
+};
+
+#endif /* ! GCC_DIAGNOSTIC_METADATA_H */