X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=ir%2Fir%2Firhooks.c;h=478f2e2c9c6b29d05db426ec6aa271faea3c98d5;hb=b7bf9774e5e704382bdf3eb7c09bc5755d4f067e;hp=e5b6bcf9a2dabffdf5c3198443524238191d9157;hpb=1a3b7d363474ab544c13093a2f0b578718d37c7a;p=libfirm

diff --git a/ir/ir/irhooks.c b/ir/ir/irhooks.c
index e5b6bcf9a..478f2e2c9 100644
--- a/ir/ir/irhooks.c
+++ b/ir/ir/irhooks.c
@@ -25,6 +25,8 @@
  */
 #include "config.h"
 
+#include <assert.h>
+
 #include "irhooks.h"
 
 /* the hooks */
@@ -37,6 +39,9 @@ void register_hook(hook_type_t hook, hook_entry_t *entry)
   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;
 }
@@ -52,7 +57,8 @@ 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;