DEC Text Processing Utility Program Development

5.7 Debugging DECTPU Programs

To compile all code in the buffer, use the EXTEND ALL command or use the COMPILE (CURRENT_BUFFER) statement. To execute a procedure after compilation, use the TPU command. For example, if you want to execute the compiled procedure user_fum, type the following at the EVE Command prompt:

Command: TPU user_fum

When DECTPU encounters a breakpoint (or when you use the STEP command described later), DECTPU invokes the debugger program. As the debugger assumes control, it receives from DECTPU the name of the procedure whose execution has been suspended. The debugger searches its source buffer for that procedure.

When DECTPU encounters the first breakpoint in the session, the code you are debugging has not yet been placed in the debugger’s source buffer. The debugger prompts for the name of the file that contains your code. Using your response, the debugger places your code in its source buffer. The debugger uses your previous response to supply missing fields, if any, in subsequent file names that you specify. All files read into the source buffer remain there, so that the time DECTPU takes to find a procedure may increase as more files are read into the source buffer.

You cannot use the TPU command followed by the MESSAGE built-in procedure to examine the contents of a local variable while debugging. To use the MESSAGE built-in to examine a local variable, you must write the MESSAGE built-in into the procedure you are debugging. After the statement that contains MESSAGE is executed, you can examine the message buffer to see the results. Alternatively, you can use the debugger EXAMINE command to examine local variables and the formal parameters of the suspended procedure.

5.8 Handling Errors

Each DECTPU built-in procedure returns one or more status codes telling you what happened when the built-in was executed. A DECTPU status code can have one of the following severity levels:

•SUCCESS

•INFORMATIONAL

•WARNING

•ERROR

•FATAL

You can enable or disable the display of informational or success messages with the SET (INFORMATIONAL) and SET (SUCCESS) built-in procedures.

See Chapter 4 for a description of how to use the ON_ERROR language statement to trap error and warning messages.

In addition to messages that are generated by DECTPU, a built-in procedure may return system messages.

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Compaq AA-PWCBD-TE manual Handling Errors, Command TPU userfum, Success Informational Error Fatal
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