The called routine is external to the caller Let use assume that the call is at nest- ing level n and the called routine is at level m, with m< n. The called routine and the caller therefore share the static structure up to level m − 1 and also the displayup to position m − 1. Display element m is updated with the pointer to the activa-tion record of the called routine and until the called routine terminates, the activedisplay is the one formed of the first m elements. The old value contained in posi- tion m must be saved because it points to the activation record of the block which will be re-activated when the called routine terminates; thereafter, the display will go back to being the one used before the call.
đang được dịch, vui lòng đợi..
