libcc1/callbacks.cc

   1 /* Callback management.
   2    Copyright (C) 2014-2017 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 #include <cc1plugin-config.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #include "callbacks.hh"
  24 #include "libiberty.h"
  25
  26 // An entry in the hash table.
  27 struct method
  28 {
  29   const char *name;
  30   cc1_plugin::callback_ftype *func;
  31 };
  32
  33 // Hash function for struct method.
  34 static hashval_t
  35 hash_method (const void *a)
  36 {
  37   const struct method *m = (const struct method *) a;
  38
  39   return htab_hash_string (m->name);
  40 }
  41
  42 // Equality function for struct method.
  43 static int
  44 eq_method (const void *a, const void *b)
  45 {
  46   const struct method *ma = (const struct method *) a;
  47   const struct method *mb = (const struct method *) b;
  48
  49   return strcmp (ma->name, mb->name) == 0;
  50 }
  51
  52 cc1_plugin::callbacks::callbacks ()
  53   : m_registry (htab_create_alloc (10, hash_method, eq_method,
  54                                    free, xcalloc, free))
  55 {
  56 }
  57
  58 cc1_plugin::callbacks::~callbacks ()
  59 {
  60   htab_delete (m_registry);
  61 }
  62
  63 void
  64 cc1_plugin::callbacks::add_callback (const char *name,
  65                                      cc1_plugin::callback_ftype *func)
  66 {
  67   method m;
  68   method **slot;
  69
  70   m.name = name;
  71   m.func = func;
  72
  73   slot = (method **) htab_find_slot (m_registry, &m, INSERT);
  74   *slot = XNEW (method);
  75   **slot = m;
  76 }
  77
  78 cc1_plugin::callback_ftype *
  79 cc1_plugin::callbacks::find_callback (const char *name)
  80 {
  81   method m, *found;
  82
  83   m.name = name;
  84
  85   found = (method *) htab_find (m_registry, &m);
  86   if (found == NULL)
  87     return NULL;
  88
  89   return found->func;
  90 }