php-src/ext/rpc/rpc.h

#ifndef RPC_H
#define RPC_H

#define FOREACH_HANDLER for (__handler_counter=0; __handler_counter < HANDLER_COUNT; __handler_counter++)
#define HANDLER handler_entries[__handler_counter]
#define HANDLER_COUNT (sizeof(handler_entries) / sizeof(rpc_handler_entry))

#define GET_INTERNAL(intern)	rpc_internal **intern;								\
								if (GET_INTERNAL_EX(intern, object) == FAILURE) {	\
									/* TODO: exception */							\
								}

#define GET_INTERNAL_EX(intern, object)	zend_hash_index_find(instance, object->value.obj.handle, (void **) &intern)

#define RPC_REFCOUNT(intern) ((*intern)->refcount)
#define RPC_ADDREF(intern) (++RPC_REFCOUNT(intern))
#define RPC_DELREF(intern) (--RPC_REFCOUNT(intern))

#define RPC_CLONECOUNT(intern) ((*intern)->clonecount)
#define RPC_ADDCLONE(intern) (++RPC_CLONECOUNT(intern))
#define RPC_DELCLONE(intern) (--RPC_CLONECOUNT(intern))

static int __handler_counter;

#endif