229   // Find the specific ik version that contains this source_file_name_index

   226   // RedefineClasses() currently permits redefine operations to

   230   // via the previous versions list, but use the current version's

   227   // happen in parallel using a "last one wins" philosophy. That

   231   // constant pool to look it up.  The previous version's index has been

   228   // spec laxness allows the constant pool entry associated with

   232   // merged for the current constant pool.

   229   // the source_file_name_index for any older constant pool version

   233   InstanceKlass* ik = holder->get_klass_version(version);

   230   // to be unstable so we shouldn't try to use it.

   234   // This version has been cleaned up.

   231   if (holder->constants()->version() != version) {

   235   if (ik == NULL) return NULL;

   232     return NULL;

   236   int source_file_name_index = ik->source_file_name_index();

   233   } else {

   237   return (source_file_name_index == 0) ?

   234     return holder->source_file_name();

   238       (Symbol*)NULL : holder->constants()->symbol_at(source_file_name_index);

   235   }