--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/go/gofrontend/string-dump.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,25 @@
+// string-dump.h -- Abstract base class for dumping strings.    -*- C++ -*-
+
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef GO_STRING_DUMP_H
+#define GO_STRING_DUMP_H
+
+// This abstract class provides an interface strings for whatever purpose.
+// Used for example for exporting and dumping objects.
+
+class String_dump 
+{
+ public:
+  // Write a string. Implements the String_dump interface.
+  virtual void
+  write_string(const std::string& s) = 0;
+
+  // Implementors should override this member, to dump a formatted c string.
+  virtual void
+  write_c_string(const char*) = 0;
+};
+
+#endif  // GO_STRING_DUMP_H