Getting Started with the Dectpu Debugger

DEC Text Processing Utility Program Development

5.7 Debugging DECTPU Programs

After setting breakpoints, use the GO command to switch control of execution from the debugger to DECTPU. After you have used this command, the screen displays the code you speciﬁed.

5.7.2.2 Debugging Command Files

To invoke the debugger on a command ﬁle, use the /DEBUG, /COMMAND, and /NOSECTION qualiﬁers. To debug a command ﬁle called MY_COMMANDS.TPU, type the following at the DCL prompt:

$ EDIT/TPU/NOSECTION/COMMAND=MY_COMMANDS.TPU/DEBUG

DECTPU compiles and executes the debugger and places the debug window on the screen before compiling the command ﬁle. As a result, you must set breakpoints in the command ﬁle before it has been compiled. When you set breakpoints, DECTPU notiﬁes you that you have speciﬁed breakpoints at nonexistent procedures.

To continue with the debugging session, use the GO command. GO causes DECTPU to compile the contents of the command ﬁle. Recompiling a procedure does not remove any breakpoints set in that procedure.

You cannot use the DECTPU debugger on a ﬁle that does not contain DECTPU procedures. If your command ﬁle does not contain any procedures, you must ﬁnd a different method of debugging it.

5.7.2.3 Debugging Other DECTPU Source Code

To debug a DECTPU program that is not a section ﬁle or a command ﬁle, use the /DEBUG qualiﬁer when you invoke DECTPU. For example, to debug procedures in a ﬁle called USER_APPLICATION.TPU, invoke the debugger on the command line as follows:

$ EDIT/TPU/DEBUG USER_APPLICATION.TPU

The debugger creates a window that ﬁlls the screen as described in

Section 5.7.2.1.

5.7.3 Getting Started with the DECTPU Debugger

This section describes using the default DECTPU debugger with EVE.

If you know which parts of the code you want to debug, use the SET BREAKPOINT command to set breakpoints. If you need to look at the code before setting breakpoints, use the GO command as soon as the debugger window appears. This places on the screen the code in the ﬁle you speciﬁed on the command line. At this point, EVE commands are available so you can manipulate the text. To return to the debugger so you can set breakpoints, enter the command DEBUG at the EVE command line. You can also gain access to the debugger with the DECTPU procedure called DEBUGON. To invoke this procedure from within EVE, type the following at the EVE Command prompt:

Command: TPU DEBUGON

When you use either DEBUG or DEBUGON, the screen displays the debugger window and command line. After setting breakpoints, use the GO command to return control of execution to DECTPU.

DEC Text Processing Utility Program Development 5–29

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