Add remove_tuples function

[libfirm] / ir / ir / irhooks.c

diff --git a/ir/ir/irhooks.c b/ir/ir/irhooks.c
index e5b6bcf..478f2e2 100644 (file)
--- 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;