Assume that the program of Problem 4 is implemented using the shallow-access method using a stack for each variable name. Show the stacks for the time of the execution of fun3, assuming execution found its way to that point through the sequence of calls shown in Problem 4.
Data from Problem 4:
Show the stack with all activation record instances, including static and dynamic chains, when execution reaches position 1 in the following skeletal program. This program uses the deep-access method to implement dynamic scoping.
The calling sequence for this program for execution to reach fun3 is
main calls fun2
fun2 calls fun1
fun1 calls fun1
fun1 calls fun3
