| line # |
|
comments |
| 4 |
|
first line out of a subroutine |
| 5 |
abc |
subroutine ``abc'' stores the line # to return to |
| |
return line # |
|
| |
6 |
the line to return to is 6 |
| 2 |
|
the only line in the subroutine to execute |
| 3 |
return |
we are ready to return, use the stored return line # |
| 6 |
abc |
subroutine ``abc'' is now invoked a second time. The column that stores the return line number is reconstructed |
| |
return line # |
|
| |
7 |
this time, the line to return to is 7 |
| 2 |
|
|
| 3 |
return |
we are ready to return, use the stored return line # |
| 7 |
|
now we are back to the invoker's (caller's) code |
