Red Hat Developer Toolset 1.x User Guide - Linux

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34 Chapter 3. GNU Debugger (GDB) print variable_name Example 3.9. Displaying the Current Values of Variables Assuming that you have followed the instructions in Example 3.8, “Executing the fibonacci Binary File” and the execution of the fibonacci binary stopped after reaching the breakpoint at line 10, you can display the current values of variables a and b as follows: (gdb) print a $1 = 0 (gdb) print b $2 = 1 3.8. Continuing Execution To resume the execution of the program you are debugging after it reached a breakpoint, run the following command: continue The execution stops again when another breakpoint is reached. To skip a certain number of breakpoints (typically when you are debugging a loop), you can run the continue command in the following form: continue number The gdb utility also allows you to stop the execution after executing a single line of code. To do so, run: step Finally, you can execute a certain number of lines by using the step command in the following form: step number
Red Hat Developer Toolset 1.x User Guide 35 Example 3.10. Continuing the Execution of the fibonacci Binary File Assuming that you have followed the instructions in Example 3.8, “Executing the fibonacci Binary File” and the execution of the fibonacci binary stopped after reaching the breakpoint at line 10, you can resume the execution by running the following command: (gdb) continue Continuing. Breakpoint 1, main (argc=1, argv=0x7fffffffe4d8) at fibonacci.c:10 10 printf("%ld ", b); The execution stops the next time the breakpoint is reached. To execute next three lines of code, type: (gdb) step 3 13 b = sum; This allows you to verify the current value of the sum variable before it is assigned to b: (gdb) print sum $3 = 2 3.9. Additional Resources A detailed description of the GNU Debugger and all its features is beyond the scope of this book. For more information, refer to the resources listed below. Online Documentation Red Hat Enterprise Linux 6 Developer Guide — The Developer Guide for Red Hat Enterprise Linux 6 provides more information on the GNU Debugger and debugging. GDB Documentation — The official GDB documentation includes the GDB User Manual and other reference material. See Also Section B.2, “Changes in GDB 7.5” provides a comprehensive list of features and improvements over the Red Hat Enterprise Linux system version of the GNU Debugger. Chapter 1, Red Hat Developer Toolset provides an overview of Red Hat Developer Toolset and more information on how to install it on your system. Chapter 2, GNU Compiler Collection (GCC) provides further information on how to compile programs written in C, C++, and Fortran. Chapter 10, Eclipse provides a general introduction to the Eclipse development environment, and describes how to use it with the tools from Red Hat Developer Toolset.
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Red Hat Developer Toolset 1.x User Guide - Linux

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