Introduction to the IBM Application Development Tools on z/OS and OS/390

© Copyright IBM Corp. 2002. All rights reserved. 95

Chapter 3. Introduction to Debug Tool

and Debug Tool Utilities and

Advanced Functions V3.1

IBM Debug Tool V3.1 lets application programmers trace through an application

program to determine where errors exist, trace program execution and to identify

areas of potential problems. In this chapter, our emphasis is on application

programs written in Enterprise COBOL for z/OS and OS/390 V3R2. However, we

identify some of the differences that are applicable to those written in PL/I for

MVS and VM, Enterprise PL/I for z/OS and OS/390, and C/C++.

The basic Debug Tool is provided with one of the full function compilers COBOL

for MVS and VM and later, PL/I for MVS and VM and later, Enterprise va Java for

OS/390 and the C/C++ Productivity Tools. Additional functionality like Code

Coverage Utility, Playback and Automonitor support, Compile and Link

Preparation Utility are provided with Debug Tool Utilities and Advanced Functions

V3.1.

We start by listing the appropriate software levels at which we conducted the

research for this book. We describe how to prepare an application program to be

debugged with Debug Tool, discuss the different user interfaces, and describe

how to invoke an application program and Debug Tool. We include various

considerations for debugging batch, CICS, IMS, DB2 and programs running in

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96 IBM Application Development Tools for z/OS and OS/390

the unix system services. We discuss the new features of Debug Tool utilities and

advanced functions. Finally, we present some hints and tips for application and

systems programmers.

Debug Tool Coverage Utility (DTCU) a tool which enables you to determine which

code statements have been executed by running your programs in a special test

environment.