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23. Debugging
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The second impact of psychological set is in selecting parts of the program to examine when an error is found. Research has shown that the programmers who debug most effectively mentally slice away parts of the program that aren t relevant during debugging (Basili, Selby, and Hutchens 1986). In general, the practice allows excellent programmers to narrow their search fields and find defects more quickly. Sometimes, however, the part of the program that contains the defect is mistakenly sliced away. You spend time scouring a section of code for a defect, and you ignore the section that contains the defect. You took a wrong turn at the fork in the road and need to back up before you can go forward again. Some of the suggestions in Section 23.2 s discussion of tips for finding defects are designed to overcome this debugging blindness.
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Psychological distance can be defined as the ease with which two items can be differentiated. If you are looking at a long list of words and have been told that they re all about ducks, you could easily mistake Queck for Quack because the two words look similar. The psychological distance between the words is small. You would be much less likely to mistake Tuack for Quack even though the difference is only one letter again. Tuack is less like Quack than Queck is because the first letter in a word is more prominent than the one in the middle. Here are examples of psychological distances between variable names:
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Table 23-1. Examples of Psychological Distance Between Variable Names First Variable Second Variable Psychological Distance
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For details on creating variable 6 names that won t be 7 confusing, see Section 11.7, 8 Kinds of Names to Avoid.
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5 CROSS-REFERENCE
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stoppt stcppt Almost invisible shiftrn shiftrm Almost none dcount bcount Small claims1 claims2 Small product sum Large As you debug, be ready for the problems caused by insufficient psychological distance between similar variable names and between similar routine names. As you construct code, choose names with large differences so that you avoid the problem.
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23. Debugging
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23.5 Debugging Tools Obvious and Not-SoObvious
The line between testing tools and debugging tools is fuzzy. For details on testing tools, see Section 22.5, Test-Support Tools. For details on tools for other softwaredevelopment activities, see 30, Programming Tools.
2 CROSS-REFERENCE
You can do much of the detailed, brain-busting work of debugging with debugging tools that are readily available. The tool that will drive the final stake through the heart of the defect vampire isn t yet available, but each year brings an incremental improvement in available capabilities.
Diff
A source-code comparator such as Diff is useful when you re modifying a program in response to errors. If you make several changes and need to remove some that you can t quite remember, a comparator can pinpoint the differences and jog your memory. If you discover a defect in a new version that you don t remember in an older version, you can compare the files to determine exactly what changed.
Compiler Warning Messages
One of the simplest and most effective debugging tools is your own compiler.
4 KEY POINT
Set your compiler s warning level to the highest, pickiest level possible and fix the code so that it doesn t produce any compiler warnings It s sloppy to ignore compiler errors. It s even sloppier to turn off the warnings so that you can t even see them. Children sometimes think that if they close their eyes and can t see you, they ve made you go away. Setting a switch on the compiler to turn off warnings just means you can t see the errors. It doesn t make them go away any more than closing your eyes makes an adult go away.
Assume that the people who wrote the compiler know a great deal more about your language than you do. If they re warning you about something, it usually means you have an opportunity to learn something new about your language. Make the effort to understand what the warning really means.
Treat warnings as errors Some compilers let you treat warnings as errors. One reason to use the feature is that it elevates the apparent importance of a warning. Just as setting your watch five minutes fast tricks you into thinking it s five minutes later than it is, setting your compiler to treat warnings as errors tricks you into taking them more seriously. Another reason to treat warnings as errors is that they often affect how your program compiles. When you compile and link a program, warnings typically won t stop the program from linking but errors typically will. If you want to check warnings before you link, set the compiler switch that treats warnings as errors.
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