how to use the MACROs?

i am puzzled by the macros used in the source code of kannel
just like the difinition of the MSG and the State-machine

here is the source code in the wtls_state-decl.h
 ROW(CREATING,
    SEC_Exception_Req,
    1,
    {
            info(0,"----------------begin a new 12 machine-----------");
            /* Send off a T_Unitdata_Req containing an exception as specified */
            send_alert(event->u.SEC_Exception_Req.alert_level,
                       event->u.SEC_Exception_Req.alert_desc, wtls_machine);
    },
    CREATING)


the source code in the wtls.c

if(event->type == T_Unitdata_Ind)
 {
 if( wtls_machine->encrypted )
 {
 info(0, "lyl: start pdu list ");
 wtls_decrypt_pdu_list(wtls_machine, event->u.T_Unitdata_Ind.pdu_list);
 }
 info(0, "lyl: end pdu list ");
 du_list);
 }
#define STATE_NAME(state)
     #define ROW(wtls_state, event_type, condition, action, next_state) \
             if (wtls_machine->state == wtls_state && \
                event->type == event_type && \
                (condition)) { \
                action \
                wtls_machine->state = next_state; \
                debug("wap.wtls", 0, "WTLS %ld: New state %s", wtls_machine->mid
, #next_state); \
             } else
     #include "wtls_state-decl.h"
             {
                error(0, "WTLS: handle_event: unhandled event!");
                debug("wap.wtls",0, "lyl: event->type = %d", event->type);
                wap_event_destroy(event);
                return;
             }

i want to know how to use and run it ,please help me :)