July 2009
Intermediate to advanced
544 pages
11h 24m
English
Content preview from Why Programs Fail, 2nd Edition
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CHAPTER 15 Fixing the Defect
Once we have understood a failure’s cause–effect chain, we know how the failure came to be. Still, we must find the place where the infection begins—that is, the actual location of the defect. In this chapter, we discuss how to narrow down a defect systematically—and having found the defect, how to fix it.
15.1 LOCATING THE DEFECT
Section 9.5 in Chapter 9 discussed a general strategy for narrowing down infection sites:
- 1. We start with the infected value that defines the failure (Figure 15.1a).
- 2. We determine the possible origins of the infected value, following dependences in the source code (Figure 15.1b).
- 3. Using observation, we check each single origin to determine whether it is infected or not (Figure ...
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