Could you link me to any sources for that GCC behavior? Also, if we can have dynamically established handlers, then we could also have dynamically established

Could you link me to any sources for that GCC behavior? Also, if we can have dynamically established handlers, then we could also have dynamically established restarts (even if by means of a dynamic variable implemented via a lexical variable + a destructor), and therefore we could have a COMPUTE-RESTARTS of our own and then be able to invoke it arbitrarily as well as invoke individual restarts.