libcc1/callbacks.hh

   1 /* Callback management
   2    Copyright (C) 2014-2022 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef CC1_PLUGIN_CALLBACKS_HH
  21 #define CC1_PLUGIN_CALLBACKS_HH
  22
  23 #include "status.hh"
  24 #include "hashtab.h"
  25
  26 namespace cc1_plugin
  27 {
  28   class connection;
  29
  30   // The type of a callback method.
  31   typedef status callback_ftype (connection *);
  32
  33   // This class manages callback functions.  A callback has a name and
  34   // an underlying function.  When a query packet arrives, the name is
  35   // inspected and the corresponding function is called.  A callback
  36   // function has to know how to decode its own arguments, but
  37   // wrappers are provided elsewhere to automate this.
  38   class callbacks
  39   {
  40   public:
  41
  42     callbacks ();
  43     ~callbacks ();
  44
  45     callbacks (const callbacks &) = delete;
  46     callbacks &operator= (const callbacks &) = delete;
  47
  48     // Add a callback named NAME.  FUNC is the function to call when
  49     // this method is invoked.
  50     void add_callback (const char *name, callback_ftype *func);
  51
  52     // Look up a callback by name.  Returns NULL if the method is not
  53     // found.
  54     callback_ftype *find_callback (const char *name);
  55
  56   private:
  57
  58     // The mapping.
  59     htab_t m_registry;
  60   };
  61 };
  62
  63 #endif // CC1_PLUGIN_CALLBACKS_HH