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diff --git a/libcc1/callbacks.hh b/libcc1/callbacks.hh
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+/* Callback management
+   Copyright (C) 2014 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_CALLBACKS_HH
+#define CC1_PLUGIN_CALLBACKS_HH
+
+#include "status.hh"
+#include "hashtab.h"
+
+namespace cc1_plugin
+{
+  class connection;
+
+  // The type of a callback method.
+  typedef status callback_ftype (connection *);
+
+  // This class manages callback functions.  A callback has a name and
+  // an underlying function.  When a query packet arrives, the name is
+  // inspected and the corresponding function is called.  A callback
+  // function has to know how to decode its own arguments, but
+  // wrappers are provided elsewhere to automate this.
+  class callbacks
+  {
+  public:
+
+    callbacks ();
+    ~callbacks ();
+
+    // Add a callback named NAME.  FUNC is the function to call when
+    // this method is invoked.
+    void add_callback (const char *name, callback_ftype *func);
+
+    // Look up a callback by name.  Returns NULL if the method is not
+    // found.
+    callback_ftype *find_callback (const char *name);
+
+  private:
+
+    // Declared but not defined to avoid use.
+    callbacks (const callbacks &);
+    callbacks &operator= (const callbacks &);
+
+    // The mapping.
+    htab_t m_registry;
+  };
+};
+
+#endif // CC1_PLUGIN_CALLBACKS_HH