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23. Debugging
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CHECKLIST: Debugging Reminders
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Techniques for Finding Defects
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Use all the data available to make your hypothesis Refine the test cases that produce the error Exercise the code in your unit test suite Use available tools Reproduce the error several different ways Generate more data to generate more hypotheses Use the results of negative tests Brainstorm for possible hypotheses Narrow the suspicious region of the code Be suspicious of classes and routines that have had defects before Check code that s changed recently Expand the suspicious region of the code Integrate incrementally Check for common defects Talk to someone else about the problem Take a break from the problem Set a maximum time for quick and dirty debugging Make a list of brute force techniques, and use them
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Don t trust line numbers in compiler messages Don t trust compiler messages Don t trust the compiler s second message Divide and conquer Find extra comments and quotation marks
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Techniques for Fixing Defects
Understand the problem before you fix it Understand the program, not just the problem Confirm the defect diagnosis Relax Save the original source code Fix the problem, not the symptom
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23. Debugging
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Change the code only for good reason Make one change at a time Check your fix Look for similar defects
General Approach to Debugging
Do you use debugging as an opportunity to learn more about your program, mistakes, code quality, and problem-solving approach Do you avoid the trial-and-error, superstitious approach to debugging Do you assume that errors are your fault Do you use the scientific method to stabilize intermittent errors Do you use the scientific method to find defects Rather than using the same approach every time, do you use several different techniques to find defects Do you verify that the fix is correct Do you use compiler warning messages, execution profiling, a test framework, scaffolding, and interactive debugging
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Additional Resources
Agans, David J. Debugging: The Nine Indispensable Rules for Finding Even the Most Elusive Software and Hardware Problems. Amacom, 2003. This book provides general debugging principles that can be applied in any language or environment. Myers, Glenford J. The Art of Software Testing. New York: John Wiley, 1979. 7 of this classic book is devoted to debugging. Allen, Eric. Bug Patterns In Java. Berkeley, Ca.: Apress, 2002. This book lays out an approach to debugging Java programs that is conceptually very similar to what is described in this chapter, including The Scientific Method of Debugging, distinguishing between debugging and testing, and identifying common bug patterns. The following two books are similar in that their titles suggest they are applicable only to Microsoft Windows and .NET programs, but they both contain discussions of debugging in general, use of assertions, and coding practices that help to avoid bugs in the first place.
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Robbins, John. Debugging Applications for Microsoft .NET and Microsoft Windows. Redmond, Wa.: Microsoft Press, 2003. McKay, Everett N. and Mike Woodring, Debugging Windows Programs: Strategies, Tools, and Techniques for Visual C++ Programmers. Boston, Mass.: Addison Wesley, 2000.
Key Points
Debugging is a make-or-break aspect of software development. The best approach is to use other techniques described in this book to avoid defects in the first place. It s still worth your time to improve your debugging skills, however, because the difference between good and poor debugging performance is at least 10 to 1. A systematic approach to finding and fixing errors is critical to success. Focus your debugging so that each test moves you a step forward. Use the Scientific Method of Debugging. Understand the root problem before you fix the program. Random guesses about the sources of errors and random corrections will leave the program in worse condition than when you started. Set your compiler warning to the pickiest level possible, and fix the errors it reports. It s hard to fix subtle errors if you ignore the obvious ones. Debugging tools are powerful aids to software development. Find them and use them. Remember to use your brain at the same time.
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