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Symbolic Debuggers
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The availability of debuggers varies according to the maturity of the technology environment. For more on this phenomenon, see Section 4.3, Your Location on the Technology Wave.
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9 CROSS-REFERENCE
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A symbolic debugger is a technological supplement to code walkthroughs and inspections. A debugger has the capacity to step through code line by line, keep track of variables values, and always interpret the code the same way the computer does. The process of stepping through a piece of code in a debugger and watching it work is enormously valuable. Walking through code in a debugger is in many respects the same process as having other programmers step through your code in a review. Neither your peers nor the debugger has the same blind spots that you do. The additional benefit with a debugger is that it s less labor-intensive then a team review. Watching your code execute under a variety of input-data sets is good assurance that you ve implemented the code you intended to. A good debugger is even a good tool for learning about your language because you can see exactly how the code executes. You can toggle back and forth between a view of your high-level language code and a view of the assembler code to see how the high-level code is translated into assembler. You can watch registers and the stack to see how arguments are passed. You can look at code your compiler has optimized to see the kinds of optimizations that are performed. None of these benefits has much to do with the debugger s intended use diagnosing errors that have already been detected but imaginative use of a debugger produces benefits far beyond its initial charter.
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22. Developer Testing
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Page 31
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Another class of test-support tools are designed to perturb a system. Many people have stories of programs that work 99 times out of 100 but fail on the hundredth run-through with the same data. The problem is nearly always a failure to initialize a variable somewhere, and it s usually hard to reproduce because 99 times out of 100 the uninitialized variable happens to be 0. This class includes tools that have a variety of capabilities: Memory filling. You want to be sure you don t have any uninitialized variables. Some tools fill memory with arbitrary values before you run your program so that uninitialized variables aren t set to 0 accidentally. In some cases, the memory may be set to a specific value. For example, on the x86 processor, the value 0xCC is the machine-language code for a breakpoint interrupt. If you fill memory with 0xCC and have an error that causes you to execute something you shouldn t, you ll hit a breakpoint in the debugger and detect the error. Memory shaking. In multi-tasking systems, some tools can rearrange memory as your program operates so that you can be sure you haven t written any code that depends on data being in absolute rather than relative locations. Selective memory failing. A memory driver can simulate low-memory conditions in which a program might be running out of memory, fail on a memory request, grant an arbitrary number of memory requests before failing, or fail on an arbitrary number of requests before granting one. This is especially useful for testing complicated programs that work with dynamically allocated memory. Memory-access checking (bounds checking). Bounds checkers watch pointer operations to make sure your pointers behave themselves. Such a tool is useful for detecting uninitialized or dangling pointers.
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Error Databases
One powerful test tool is a database of errors that have been reported. Such a database is both a management and a technical tool. It allows you to check for recurring errors, track the rate at which new errors are being detected and corrected, and track the status of open and closed errors and their severity. For details on what information you should keep in an error database, see Section 22.7, Keeping Test Records.
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