--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/tracer.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,26 @@
+/* Header file for Tracer.
+   Copyright (C) 2015-2017 Free Software Foundation, Inc.
+
+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_TRACER_H
+#define GCC_TRACER_H
+
+extern basic_block transform_duplicate (basic_block bb, basic_block bb2);
+extern bool ignore_bb_p (const_basic_block bb);
+
+#endif /* GCC_TRACER_H */