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Anyone who has written anything more substantial than a Hello world program has encountered defects (bugs) in their software. Though most defects are easily found, others can be difficult to locate and correct. If you wanted to explain the concept of debugging to a novice developer, you d probably tell them it s largely a process of troubleshooting in an effort to discover what went wrong. You might also note that developing good debugging skills comes by way of mastering the appropriate debugging techniques and tools. While this may be an adequate introductory definition, you should take the time to gain a better understanding of debugging nuances. For starters, it s important that you properly frame the sort of defect you re trying to locate and correct. There are two basic types of defects: syntax errors and logic errors. Syntax errors are naturally found during the code compilation process and although they too may be difficult to correct, we are forced to correct them in order to build the software. However, logic errors are those types of errors not found during compilation and thus they are usually manifested as defects during the execution of the software. Debugging therefore is the act of finding and fixing errors in your program.
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Note Tools are available that you can run at compile time (or earlier). These tools help minimize the risk
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of logic errors. They range from simple flow control analyzers that detect dead code to more sophisticated range and type checkers that walk your code to locate possible data mismatches. There are also tools designed to check for proper error handling using best practices for code hardening.
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CHAPTER 5 DEBUGGING
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When a logic error is found, the system usually does something odd or produces erroneous data. In the more extreme cases, the system may actually crash. Well-structured systems that include code hardening best practices tend to be more robust than others because they are designed to capture and handle errors as they occur. Even then, some errors are so severe that the system crashes (or the operating system terminates it) in order to protect the data and the system state. The art of debugging software is the ability to quickly locate the error, either by observing the system as its state changes or by direct inspection of the code and its data. We call the tools that we use to debug system debuggers. In the following sections, I ll examine some common debugging techniques and related debuggers.
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THE ORIGINS OF DEBUGGING
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You have no doubt heard stories about how the term computer bug was coined, and I d like to tell my favorite one. I have the pleasure of working near the location where Admiral Grace Hopper discovered the first computer bug. Legend has it that Rear Admiral Hopper was working with a large computational computer called a Mark II Aiken Relay Calculator in 1945. To call it a large computer today would be a stretch, but it was the size of a semi back then. When a troublesome electronic problem was traced to a failed relay that had a moth trapped in it, Admiral Hopper noted that the source of the error was a bug and that the system had been debugged and was now operational. To this day we refer to the removal of defective code as debugging.
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Debugging Techniques
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There are almost as many debugging techniques as there are developers. It seems everyone debugs their code in a slightly different way. However, these approaches can generally be grouped into several categories. The most basic of these approaches are included in the source code and become part of the executable. These include inline debugging statements (statements that print messages or values of variables during execution, e.g., printf("Code is at line 199. my_var = %d\n", my_var);) and error handlers. Most developers use these techniques either as a last resort (when a defect cannot be found easily) or during the development phase (to test the code as it is being written). While you may think that error handlers have more to do with robustness and hardening than debugging, they can also be powerful debugging tools. Since this approach embeds the debugging code into the program, you can use conditional compilation directives to omit the code when debugging is complete. Most developers leave the debugging statements in the code and thus they become part of the program. You should take care when using this technique to ensure the added debugging code does not adversely affect the program. The debugging technique most of you know best is the use of external debuggers. External debuggers are tools designed to either monitor the system in real time or permit you to watch the execution of the code with the ability to stop and start the code at any point. These techniques are described in detail in the following sections. But first, let s take a look at the basic process for debugging.
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