--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/objc/objc-encoding.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,59 @@
+/* Routines dealing with ObjC encoding of types
+   Copyright (C) 1992-2017 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_OBJC_ENCODING_H
+#define GCC_OBJC_ENCODING_H
+
+/* This is used to initialize the obstacks used by encoding.  It
+   should be called before any encoding function is used.  It is
+   usually done in objc_init().  */
+extern void objc_encoding_init (void);
+
+/* Encode a method prototype.  The format is described in
+   gcc/doc/objc.texi, section 'Method signatures'.  */
+extern tree encode_method_prototype (tree method_decl);
+
+/* This is used to implement @encode().  See gcc/doc/objc.texi,
+   section '@encode'.  */
+extern tree objc_build_encode_expr (tree type);
+
+/* (Decide if these can ever be validly changed.)  */
+#define OBJC_ENCODE_INLINE_DEFS		0
+#define OBJC_ENCODE_DONT_INLINE_DEFS	1
+
+/* Encode the attributes of a property.  */
+extern tree objc_v2_encode_prop_attr (tree property);
+
+/* Encode the type of a field.  Return an identifier with the type
+   encoding for the field.  The type encoding is a null-terminated
+   string.  */
+extern tree encode_field_decl (tree field_decl);
+
+/* Tells "encode_pointer/encode_aggregate" whether we are generating
+   type descriptors for instance variables (as opposed to methods).
+   Type descriptors for instance variables contain more information
+   than methods (for static typing and embedded structures).
+
+   TODO: Replace this global variable with an argument that is passed
+   to the various encode() functions.
+
+   TODO: Change it to a 'bool'.  */
+extern int generating_instance_variables;
+
+#endif /* GCC_OBJC_ENCODING_H */