109 lines
5.0 KiB
HTML
109 lines
5.0 KiB
HTML
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<head>
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<title>Using the GNU Compiler Collection (GCC): Gcov Data Files</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Gcov Data Files">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Gcov Data Files">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Gcov.html#Gcov" rel="up" title="Gcov">
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<link href="Cross_002dprofiling.html#Cross_002dprofiling" rel="next" title="Cross-profiling">
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<link href="Gcov-and-Optimization.html#Gcov-and-Optimization" rel="prev" title="Gcov and Optimization">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Gcov-Data-Files"></a>
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<div class="header">
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<p>
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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> [<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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</div>
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<hr>
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<a name="Brief-Description-of-gcov-Data-Files"></a>
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<h3 class="section">10.4 Brief Description of <code>gcov</code> Data Files</h3>
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<p><code>gcov</code> 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>.gcno</samp>, or <samp>.gcda</samp>. The files
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contain coverage and profile data stored in a platform-independent format.
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The <samp>.gcno</samp> files are placed in the same directory as the object
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file. By default, the <samp>.gcda</samp> files are also stored in the same
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directory as the object file, but the GCC <samp>-fprofile-dir</samp> option
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may be used to store the <samp>.gcda</samp> files in a separate directory.
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</p>
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<p>The <samp>.gcno</samp> notes file is generated when the source file is compiled
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with the GCC <samp>-ftest-coverage</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>
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<p>The <samp>.gcda</samp> count data file is generated when a program containing
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object files built with the GCC <samp>-fprofile-arcs</samp> option is executed.
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A separate <samp>.gcda</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>
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<p>The full details of the file format is specified in <samp>gcov-io.h</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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</p>
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</body>
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</html>
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