| <html lang="en"> |
| <head> |
| <title>Gcov Data Files - Using the GNU Compiler Collection (GCC)</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using the GNU Compiler Collection (GCC)"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Gcov.html#Gcov" title="Gcov"> |
| <link rel="prev" href="Gcov-and-Optimization.html#Gcov-and-Optimization" title="Gcov and Optimization"> |
| <link rel="next" href="Cross_002dprofiling.html#Cross_002dprofiling" title="Cross-profiling"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2013 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Funding Free Software'', the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| ``GNU Free Documentation License''. |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| You have freedom to copy and modify this GNU Manual, like GNU |
| software. Copies published by the Free Software Foundation raise |
| funds for GNU development.--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Gcov-Data-Files"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Cross_002dprofiling.html#Cross_002dprofiling">Cross-profiling</a>, |
| Previous: <a rel="previous" accesskey="p" href="Gcov-and-Optimization.html#Gcov-and-Optimization">Gcov and Optimization</a>, |
| Up: <a rel="up" accesskey="u" href="Gcov.html#Gcov">Gcov</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">10.4 Brief description of <samp><span class="command">gcov</span></samp> data files</h3> |
| |
| <p><samp><span class="command">gcov</span></samp> 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><span class="file">.gcno</span></samp>, or <samp><span class="file">.gcda</span></samp>. The files |
| contain coverage and profile data stored in a platform-independent format. |
| The <samp><span class="file">.gcno</span></samp> files are placed in the same directory as the object |
| file. By default, the <samp><span class="file">.gcda</span></samp> files are also stored in the same |
| directory as the object file, but the GCC <samp><span class="option">-fprofile-dir</span></samp> option |
| may be used to store the <samp><span class="file">.gcda</span></samp> files in a separate directory. |
| |
| <p>The <samp><span class="file">.gcno</span></samp> notes file is generated when the source file is compiled |
| with the GCC <samp><span class="option">-ftest-coverage</span></samp> option. It contains information to |
| reconstruct the basic block graphs and assign source line numbers to |
| blocks. |
| |
| <p>The <samp><span class="file">.gcda</span></samp> count data file is generated when a program containing |
| object files built with the GCC <samp><span class="option">-fprofile-arcs</span></samp> option is executed. |
| A separate <samp><span class="file">.gcda</span></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>The full details of the file format is specified in <samp><span class="file">gcov-io.h</span></samp>, |
| and functions provided in that header file should be used to access the |
| coverage files. |
| |
| </body></html> |
| |
