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Setting and Removing Watch Conditions
Work with Watch
..........................................................
: Display Watch : DEBUGGER
: :
: Watch Number ....: 1 :
: Address .........: 080090506F027004 :
: Length ..........: 4 :
: Number of Hits ..: 0 :
: :
: Scope when watch was set: :
: Program/Library/Type: PAYROLL ABC *PGM :
: :
: Module...: PAYROLL :
: Procedure: PAYROLL :
: Variable.: SALARY :
: :
: F12=Cancel :
: :
..........................................................
Bottom
Command
===>____________________________________________________________________
F3=Exit F4=Prompt F5=Refresh F9=Retrieve F12=Cancel
Figure 89. Example of a Display Watch Window
To specify a variable or expression to be watched, type:
WATCH expression
on the debug command line.
This command requests a breakpoint to be set if the value of expression is
changed from its current value.
Note: expression is used to determine the address of the storage location to
watch and must resolve to a location that can be assigned to, for
example:
%SUBSTR(X 1 5)
The scope of the expression variables in a watch is defined by the most
recently issued QUAL command.
To set a watch condition and specify a watch length, type:
WATCH expression : watch length
on a debug command line.
Each watch allows you to monitor and compare a maximum of 128 bytes of
contiguous storage. If the maximum length of 128 bytes is exceeded, the watch
condition will not be set, and the debugger issues an error message.
By default, the length of the expression type is also the length of the watch-
comparison operation. The watch-length parameter overrides this default. It
determines the number of bytes of an expression that should be compared to
determine if a change in value has occurred.
For example, if a 4-byte integer is specified as the variable, without the watch-
length parameter, the comparison length is four bytes. However, if the watch-
length parameter is specified, it overrides the length of the expression in
determining the watch length.
Chapter 11. Debugging Programs 191