2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Generic hooks for various libFirm functions.
23 * @author Michael Beck
32 #ifdef FIRM_ENABLE_HOOKS
35 hook_entry_t *hooks[hook_last];
38 void register_hook(hook_type_t hook, hook_entry_t *entry) {
39 /* check if a hook function is specified. It's a union, so no matter which one */
40 if (! entry->hook._hook_turn_into_id)
43 entry->next = hooks[hook];
47 /* unregister a hook */
48 void unregister_hook(hook_type_t hook, hook_entry_t *entry) {
51 if (hooks[hook] == entry) {
52 hooks[hook] = entry->next;
57 for (p = hooks[hook]; p && p->next != entry; p = p->next);
60 p->next = entry->next;
68 void register_hook(hook_type_t hook, hook_entry_t *entry) {}
69 void unregister_hook(hook_type_t hook, hook_entry_t *entry) {}
71 #endif /* FIRM_ENABLE_HOOKS */
73 int firm_init_hooks(void) {
74 /* this strange code assures that both functions are available
75 in a shared library even if none of them is called.
76 Meanwhile not needed anymore but ... */
77 return (int)register_hook + (int)unregister_hook;