Guide to the DEC Text Processing Utility
DECTPU Debugger Commands
You can use the following commands for debugging once you have set
breakpoints, compiled code, and started execution.
Suspends the current editing session and transfers control to another
active process or subprocess.
DCL process names are case sensitive.
CANCEL BREAKPOINT procedure-name
Cancels a breakpoint set with the SET BREAKPOINT command.
DEPOSIT variable := expression
Lets you set the values of global variables, local variables, and
Clears text from the screen after use of the HELP or SHOW BREAKPOINTS
command. Causes the source display area to display your code.
Displays the current contents of global and local variables, global
constants, formal parameters of the procedure that has been
interrupted, and variables local to that procedure. Local constants
cannot be examined.
Causes the debugger to relinquish control of execution until it is
invoked again by a breakpoint, by the DEBUG command, or by the DEBUGON
Lists available debugger commands and keypad bindings.
Stops execution of the current procedure. Uses the ABORT statement to
return to the main loop of DECTPU. This command is useful when you have
located a problem in a procedure and are ready to get out of the
SCROLL [-] number-of-lines
Scrolls text in the source display area by the specified number of
lines. To scroll backward through the code in the display area, specify
a negative number of lines.
To scroll forward by one line less than the number of lines in the
display window, press the Next Screen key or the sequence GOLD/Down
Arrow. To scroll backward in the same way, press the Prev Screen key or
the sequence GOLD/Up Arrow.
SET BREAKPOINT procedure-name
Invokes the debugger when the specified procedure is entered.
SET WINDOW top, length
Places the top of the debugger window at the line number specified by
the top parameter. Extends the window down by the
number of lines specified by the length parameter. The default
length is 7 lines. The minimum valid length is 3 lines. The SET WINDOW
command changes only the size of the source display area. The output
area and command line always occupy exactly one line.
SHIFT [-] number-of-columns
Moves the source display window left or right across the source code to
display text wider than the screen.
To move left, you press the key sequence GOLD/Left Arrow, then enter
the number of columns to move. To move right, you press the key
sequence GOLD/Right Arrow, then enter the number of columns to move.
List the current breakpoints in the debugger source window. To
redisplay code in the source window, use the DISPLAY SOURCE command.
Suspends the current editing session and creates a new process.
Executes one line of DECTPU code, then returns control to the debugger.
If you have several DECTPU statements on one line, all statements are
executed before control returns to the debugger.
Executes the DECTPU statement you specify. You can enter more than one
statement by using the TPU command just once.