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| <a name="Brief-description-of-gcov-data-files"></a> |
| <h3 class="section">10.4 Brief description of <code>gcov</code> data files</h3> |
| |
| <p><code>gcov</code> uses two files for profiling. The names of these files |
| are derived from the original <em>object</em> file by substituting the |
| file suffix with either <samp>.gcno</samp>, or <samp>.gcda</samp>. The files |
| contain coverage and profile data stored in a platform-independent format. |
| The <samp>.gcno</samp> files are placed in the same directory as the object |
| file. By default, the <samp>.gcda</samp> files are also stored in the same |
| directory as the object file, but the GCC <samp>-fprofile-dir</samp> option |
| may be used to store the <samp>.gcda</samp> files in a separate directory. |
| </p> |
| <p>The <samp>.gcno</samp> notes file is generated when the source file is compiled |
| with the GCC <samp>-ftest-coverage</samp> option. It contains information to |
| reconstruct the basic block graphs and assign source line numbers to |
| blocks. |
| </p> |
| <p>The <samp>.gcda</samp> count data file is generated when a program containing |
| object files built with the GCC <samp>-fprofile-arcs</samp> option is executed. |
| A separate <samp>.gcda</samp> file is created for each object file compiled with |
| this option. It contains arc transition counts, value profile counts, and |
| some summary information. |
| </p> |
| <p>The full details of the file format is specified in <samp>gcov-io.h</samp>, |
| and functions provided in that header file should be used to access the |
| coverage files. |
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