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<a name="Gcov-Data-Files"></a>
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Next: <a rel="next" accesskey="n" href="Cross_002dprofiling.html#Cross_002dprofiling">Cross-profiling</a>,
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Previous: <a rel="previous" accesskey="p" href="Gcov-and-Optimization.html#Gcov-and-Optimization">Gcov and Optimization</a>,
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Up: <a rel="up" accesskey="u" href="Gcov.html#Gcov">Gcov</a>
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<h3 class="section">10.4 Brief Description of <samp><span class="command">gcov</span></samp> Data Files</h3>
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<p><samp><span class="command">gcov</span></samp> uses two files for profiling. The names of these files
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are derived from the original <em>object</em> file by substituting the
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file suffix with either <samp><span class="file">.gcno</span></samp>, or <samp><span class="file">.gcda</span></samp>. The files
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contain coverage and profile data stored in a platform-independent format.
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The <samp><span class="file">.gcno</span></samp> files are placed in the same directory as the object
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file. By default, the <samp><span class="file">.gcda</span></samp> files are also stored in the same
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directory as the object file, but the GCC <samp><span class="option">-fprofile-dir</span></samp> option
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may be used to store the <samp><span class="file">.gcda</span></samp> files in a separate directory.
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<p>The <samp><span class="file">.gcno</span></samp> notes file is generated when the source file is compiled
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with the GCC <samp><span class="option">-ftest-coverage</span></samp> option. It contains information to
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reconstruct the basic block graphs and assign source line numbers to
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blocks.
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<p>The <samp><span class="file">.gcda</span></samp> count data file is generated when a program containing
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object files built with the GCC <samp><span class="option">-fprofile-arcs</span></samp> option is executed.
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A separate <samp><span class="file">.gcda</span></samp> file is created for each object file compiled with
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this option. It contains arc transition counts, value profile counts, and
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some summary information.
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<p>The full details of the file format is specified in <samp><span class="file">gcov-io.h</span></samp>,
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and functions provided in that header file should be used to access the
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coverage files.
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