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<a name="Gcov-Data-Files"></a>
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Next: <a href="Cross_002dprofiling.html#Cross_002dprofiling" accesskey="n" rel="next">Cross-profiling</a>, Previous: <a href="Gcov-and-Optimization.html#Gcov-and-Optimization" accesskey="p" rel="prev">Gcov and Optimization</a>, Up: <a href="Gcov.html#Gcov" accesskey="u" rel="up">Gcov</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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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>It is not recommended to access the coverage files directly.
Consumers should use the intermediate format that is provided
by <code>gcov</code> tool via <samp>--json-format</samp> option.
</p>


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