* vm_method.c (rb_add_method_def): decrement alias count of

rb_method_definition_t to prevent memory leak.  see
  [ruby-dev:41021].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Wed Apr 21 00:01:05 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* vm_method.c (rb_add_method_def): decrement alias count of
+	  rb_method_definition_t to prevent memory leak.  see
+	  [ruby-dev:41021].
+
 Tue Apr 20 21:33:06 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* ext/dl/win32/lib/win32/registry.rb (PredefinedKey#create): root key

vm_method.c

@@ -215,6 +215,14 @@ rb_add_method_def(VALUE klass, ID mid, rb_method_type_t type, rb_method_definiti
 	 * another problem when the usage is changed.
 	 */
 	me = old_me;
+
+	if (me->def) {
+	    if (me->def->alias_count == 0)
+		xfree(me->def);
+	    else if (me->def->alias_count > 0)
+		me->def->alias_count--;
+	    me->def = 0;
+	}
     }
     else {
 	me = ALLOC(rb_method_entry_t);