kolusu
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Joined: 26 Nov 2002
Posts: 12370
Topics: 75
Location: San Jose
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 Posted: Tue Feb 06, 2007 12:12 am Post subject: |
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pai_sunil_bs,
Use MONITOR and REVERSE commands.
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The MONITOR and REVERSE commands are used to activate review mode. Review
mode lets you monitor and review the execution path by stepping backwards
through your program. You can view the statements that were executed
during normal (forward) execution. You can trace backwards through the
actual sequence of instructions that led to the current breakpoint and see
the data values as they were at the time. There is no guesswork about
which of the possible paths the program took; the actual path that was
taken during forward execution of the program is displayed.
The MONITOR command records the execution history and the REVERSE command
enables you to review the execution history.
To activate review mode, enter the MONITOR command from the primary
command line. MONITOR without a module name records history for the
current module1not necessarily the active module that is currently
executing, but the module indicated by the program field on the third
line.
After issuing the MONITOR command, execute the statements you want to
review. Then, when your program pauses during logical execution, enter the
following primary command:
REVERSE
The REVERSE command places the execution arrow on the last statement that
was executed, and changes the execution direction of your program1from
forward to reverse (backward). From this point on, the REVERSE command
acts as a toggle that changes the direction in which your program is
executed. During review mode, the execution status message on the fourth
line of the screen indicates the execution direction and the statement
where execution is paused.
1. Entering the REVERSE command only changes the direction of execution;
it does not cause execution to occur.
2. You must enter the GO n or GO command to begin execution in the current
direction.
The GO n command moves the active arrow n lines in the current
direction, which lets you step through the program line-by-line. Unlike
normal execution mode, a GO n command in review mode ignores module
boundaries and will pause after executing n statements, regardless of
what modules they are in. It is recommended that you use GO 1 commands
to do a backward line-by-line execution.
3. In review mode, TRACE does not recognize the default maximum limit of
25 statements, and continues execution until it encounters the AT
INITIAL EXECUTION POSITION. To halt the reverse trace, press the Attn
key.
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Hope this helps...
Cheers
Kolusu
_________________
Kolusu - DFSORT Development Team (IBM)
DFSORT is on the Web at:
www.ibm.com/storage/dfsort
www.linkedin.com/in/kolusu |
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