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Table 5-1. Basic Debugger Control Commands
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Command
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Executes the system. Temporarily halts execution of the code. Runs the next code statement, changing focus to the following statement. If the statement being executed is a function, this command will change focus to the first executable statement in the function being called. Runs the next code statement changing focus to the following statement. If the statement being executed is a function, this command will execute the function and change focus to the next executable statement following the function call. The debugger stops when code execution reaches the statement where the breakpoint has been issued. Many debuggers allow the use of conditional breakpoints where you can set the breakpoint to occur based on an expression. The debugger resumes execution but halts the execution when control reaches the code statement where the cursor is placed. This is a form of a one-use breakpoint.
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Breakpoint
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Run to Cursor
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CHAPTER 5 DEBUGGING
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Figure 5-3. Sample Visual Studio debugging (sample.c) The compilation and linking in this scenario happens in the background and often takes no longer than a moment to complete and you re back in the debugger. As you can imagine, interactive debuggers are real time savers. If you have never used a stand-alone debugger, you may be dismayed at the apparent lack of integration stand-alone debuggers have with the source code projects. What may seem like old school is really the state of most development. It is only through the relatively recent development of rapid application development tools that interactive debuggers have become the preferred tool for debugging.
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GNU Data Display Debugger
Another example of an interactive debugger is the GNU Data Display Debugger (ddd), which is available at http://www.gnu.org/software/ddd. The ddd debugger permits you to run your program and see the code while it is running. It is similar in concept to the rapid application development debuggers like Visual Studio. Figure 5-4 shows our sample program run in ddd.
CHAPTER 5 DEBUGGING
Figure 5-4. Sample ddd session debugging sample.c Notice that the same variables are displayed in the upper portion of the window. With ddd, I can set breakpoints in the code by pointing and clicking on the line of code rather than having to remember the line number in the file I want to break on. I can also view the contents of any variable by double-clicking on the variable. I can even change values in a similar fashion. This allows me to experiment with how the code would perform with different values. This is a powerful feature that can allow the discovery of off by one errors (e.g., starting a list iterator index at 1 instead of 0).
CHAPTER 5 DEBUGGING
Note Some would call the ddd tool a stand-alone debugger because it essentially operates in a standalone mode. However, because of its sophisticated user interface and development-like layout, I consider the ddd tool a hybrid that matches the interactive type a bit better than most stand-alone debuggers. Besides, it really does kick gdb up a notch!
Bidirectional Debuggers
Despite all of the power of today s debuggers have to offer, work is under way to make debugging even more efficient. Most interestingly, researchers are investigating ways to both execute and undo operations in order to observe what each operation affected. This gives the person doing the debugging the ability to roll back the execution to discover the source of the defect. This is called backwards reasoning by the researchers who promote it. They contend that the most efficient way to determine what went wrong is the ability to observe the code executing and to be able to rewind the events when a defect is found and replay them to see what changed. Tools that implement this technique are called bidirectional debuggers. A commercial product is available called UndoDB by Undo Ltd. (http://undo-software.com). UndoDB is available for the Linux platform for a modest fee for professional use and free for those who are not paid for their programming efforts. While UndoDB is not an open source product, Undo Ltd. acknowledges the contribution of the open source community and has decided to offer their innovative product for free to those who are not compensated for the software they write and whose product will not be used in a commercial endeavor. UndoDB is a stand-alone debugger that uses gdb information. However, unlike gdb, there are commands that allow you to reverse the execution to go back and undo the last statement. Listing 5-7 shows a sample debugging session using UndoDB with our sample program. Listing 5-7. Sample UndoDB Session Debugging (sample.c) # undodb-gdb sample Undodb-gdb bi-directional debugging system. Copyright 2006 Undo Ltd. undodb-gdb: starting gdb... GNU gdb 6.3 Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i586-suse-linux"... Using host libthread_db library "/lib/tls/libthread_db.so.1". (gdb) break sample.c:9 Breakpoint 1 at 0x8048414: file sample.c, line 9. (gdb) run 3 Starting program: /home/Chuck/source/testddd/sample 3
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