--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libcc1/marshall.hh	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,92 @@
+/* Marshalling and unmarshalling.
+   Copyright (C) 2014-2017 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 CC1_PLUGIN_MARSHALL_HH
+#define CC1_PLUGIN_MARSHALL_HH
+
+#include "status.hh"
+#include "gcc-interface.h"
+
+namespace cc1_plugin
+{
+  class connection;
+
+  // Only a single kind of integer is ever sent over the wire, and
+  // this is it.
+  typedef unsigned long long protocol_int;
+
+  // Read an integer from the connection and verify that it has the
+  // value V.
+  status unmarshall_check (connection *, protocol_int v);
+
+  // Write an integer, prefixed with the integer type marker, to the
+  // connection.
+  status marshall_intlike (connection *, protocol_int);
+
+  // Read a type marker from the connection and verify that it is an
+  // integer type marker.  If not, return FAIL.  If so, read an
+  // integer store it in the out argument.
+  status unmarshall_intlike (connection *, protocol_int *);
+
+  status marshall_array_start (connection *, char, size_t);
+  status marshall_array_elmts (connection *, size_t, void *);
+
+  status unmarshall_array_start (connection *, char, size_t *);
+  status unmarshall_array_elmts (connection *, size_t, void *);
+
+  // A template function that can handle marshalling various integer
+  // objects to the connection.
+  template<typename T>
+  status marshall (connection *conn, T scalar)
+  {
+    return marshall_intlike (conn, scalar);
+  }
+
+  // A template function that can handle unmarshalling various integer
+  // objects from the connection.  Note that this can't be
+  // instantiated for enum types.  Note also that there's no way at
+  // the protocol level to distinguish different int types.
+  template<typename T>
+  status unmarshall (connection *conn, T *scalar)
+  {
+    protocol_int result;
+
+    if (!unmarshall_intlike (conn, &result))
+      return FAIL;
+    *scalar = result;
+    return OK;
+  }
+
+  // Send a string type marker followed by a string.
+  status marshall (connection *, const char *);
+
+  // Read a string type marker followed by a string.  The caller is
+  // responsible for freeing the resulting string using 'delete[]'.
+  status unmarshall (connection *, char **);
+
+  // Send a gcc_type_array marker followed by the array.
+  status marshall (connection *, const gcc_type_array *);
+
+  // Read a gcc_type_array marker, followed by a gcc_type_array.  The
+  // resulting array must be freed by the caller, using 'delete[]' on
+  // the elements, and 'delete' on the array object itself.
+  status unmarshall (connection *, struct gcc_type_array **);
+};
+
+#endif // CC1_PLUGIN_MARSHALL_HH