July 2009
Intermediate to advanced
544 pages
11h 24m
English
Content preview from Why Programs Fail, 2nd Edition
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CHAPTER 7 Deducing Errors
In this chapter, we begin exploring the techniques for creating hypotheses introduced in Chapter 6. We start with deduction techniques—reasoning from the abstract program code to the concrete program run. In particular, we present program slicing, an automated means of determing possible origins of a variable value. Using program slicing, one can effectively narrow down the number of possible infection sites.
7.1 ISOLATING VALUE ORIGINS
Oops! We have observed something that should not happen—the program has reached some state it never should have reached. How did it get into this state? Kernighan and Pike (1999) give a hint:
Something impossible occurred, and the only solid information is that it really did occur. ...
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