Pascal's display table?

Would somebody please give me some hints on the following question?
Thanks much.


A Pascal program's Active Record in the stack.


--------------
| R |<----- display[4]
|------------ |
| P |
|------------ |
| S |
|------------ |
| Q |<----- display[3]
|------------ |
| P |<----- display[2]
|------------ |
| Main |<----- display[1]
|------------ |


P,Q,S,R are procedures.


It seems Main calls P, and P calls Q, and Q calls S and S calls P
again, and then P calls R. But I'm confused by the contents in the
display table. What's relationship between these procedures? I mean,
which procedure enclosed which?


-----------------------------------------------
Gu Lin
E-Mail: lgu@usa.net
                lgu@guomai.sh.cn
[The display has one entry for each procedure which lexically encloses
the current procedure. The answer depends on how the source code of
the procedures is nested. -John]
--

Return to the comp.compilers page.
Search the comp.compilers archives again.