1 /* Callback management.
2 Copyright (C) 2014-2020 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
hash_method(const void * a)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
eq_method(const void * a,const void * b)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
callbacks()52 cc1_plugin::callbacks::callbacks ()
53 : m_registry (htab_create_alloc (10, hash_method, eq_method,
54 free, xcalloc, free))
55 {
56 }
57
~callbacks()58 cc1_plugin::callbacks::~callbacks ()
59 {
60 htab_delete (m_registry);
61 }
62
63 void
add_callback(const char * name,cc1_plugin::callback_ftype * func)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 *
find_callback(const char * name)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 }
91