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DEBUGGING FUNCTIONS AND CAPABILITIES IN SYSTEM SOFTWARE CODEThen you can see what your code was doing and what it had in its variables that led to the crash. You can have the debugger show you a list of the calling stack frames in effect when the crash happened, and pick the most recent one that is your code, and have the debugger switch contexts to that function. Sometimes the crash-causing event happens in system or library code, and you see strange stuff - even assembler language - in the debugger display! Don’t panic! The problem is usually that you called a library routine (say strcmp) with some invalid parameters (like a zero pointer), and that’s why the library code crashed. Normally, if you start the program running under the debugger, and then let it go ahead, the debugger will automatically get control at the point of the crash-causing event, and you can see where the problem is happening and examine variable values at that point. The second situation is that your program is crashing - it gets terminated by the system. Once you have learned the debugger, using it this way is much faster than littering your code with print statements and trying to track the spew of output. This capability is used to investigate what is happening in. The debugger will then automatically halt on the breakpoint statement, thus taking you right to the point in the execution you are interested in. A debugger is a tool that enables control of code execution and inspection of the state of the code. For example, once you have concluded that something is wrong in your defrangulate function, you can set a breakpoint on its first statement, and then tell the program to start running. To save time, use breakpoints and the step-over buttons to skip through parts of the program that you know to be good. Around 25,000 parts, fifteen tons, eight feet high. ![]() DEBUGGING FUNCTIONS AND CAPABILITIES IN SYSTEM SOFTWARE SOFTWAREIn the previous unit we discussed several types of system software such as compiler, linker, loader and operating. 5.3.1 Debugging Functions and Capabilities. As needed, restart the program and go through that section again and in more detail. The following command enables kernel debugging for the specified Windows operating system boot entry: bcdedit /debug. As soon as you see something that is wrong, stop and try to figure out what caused it. ![]() See if the program goes where it should, and that input values, function arguments, and the results of calculations are what they should be. ![]() It can also show which statements have modified a given variable or parameter. Using these neat capabilities, check the program flow and the values of variables. DEBUGGING FUNCTIONS AND CAPABILITIES Debugging system should also provide functions such as tracing and trace back Trace back can show the path by which the current statement in the program was reached. ![]()
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