X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firhooks.c;h=52b8422b94789873909956684dd081eda46d20b4;hb=945c6c2ceebef5e41c0486c31f49d2319cacb3da;hp=e5b6bcf9a2dabffdf5c3198443524238191d9157;hpb=1a3b7d363474ab544c13093a2f0b578718d37c7a;p=libfirm

diff --git a/ir/ir/irhooks.c b/ir/ir/irhooks.c
index e5b6bcf9a..52b8422b9 100644
--- a/ir/ir/irhooks.c
+++ b/ir/ir/irhooks.c
@@ -1,47 +1,34 @@
 /*
- * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
- *
  * This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
  */
 
 /**
  * @file
  * @brief    Generic hooks for various libFirm functions.
  * @author   Michael Beck
- * @version  $Id$
  */
 #include "config.h"
 
+#include <assert.h>
+
 #include "irhooks.h"
 
-/* the hooks */
 hook_entry_t *hooks[hook_last];
 
-/* register a hook */
 void register_hook(hook_type_t hook, hook_entry_t *entry)
 {
   /* check if a hook function is specified. It's a union, so no matter which one */
   if (! entry->hook._hook_turn_into_id)
     return;
 
+  /* hook should not be registered yet */
+  assert(entry->next == NULL && hooks[hook] != entry);
+
   entry->next = hooks[hook];
   hooks[hook] = entry;
 }
 
-/* unregister a hook */
 void unregister_hook(hook_type_t hook, hook_entry_t *entry)
 {
   hook_entry_t *p;
@@ -52,7 +39,8 @@ void unregister_hook(hook_type_t hook, hook_entry_t *entry)
     return;
   }
 
-  for (p = hooks[hook]; p && p->next != entry; p = p->next);
+  for (p = hooks[hook]; p && p->next != entry; p = p->next) {
+  }
 
   if (p) {
     p->next     = entry->next;