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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gcc/Gcov-Intro.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gcc/Gcov-Intro.html b/share/doc/gcc/Gcov-Intro.html new file mode 100644 index 0000000..7a91da8 --- /dev/null +++ b/share/doc/gcc/Gcov-Intro.html @@ -0,0 +1,147 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +Copyright (C) 1988-2023 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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Using the GNU Compiler Collection (GCC): Gcov Intro</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): Gcov Intro"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Gcov Intro"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Gcov.html#Gcov" rel="up" title="Gcov"> +<link href="Invoking-Gcov.html#Invoking-Gcov" rel="next" title="Invoking Gcov"> +<link href="Gcov.html#Gcov" rel="previous" title="Gcov"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Gcov-Intro"></a> +<div class="header"> +<p> +Next: <a href="Invoking-Gcov.html#Invoking-Gcov" accesskey="n" rel="next">Invoking Gcov</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="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Introduction-to-gcov"></a> +<h3 class="section">10.1 Introduction to <code>gcov</code></h3> + +<p><code>gcov</code> is a test coverage program. Use it in concert with GCC +to analyze your programs to help create more efficient, faster running +code and to discover untested parts of your program. You can use +<code>gcov</code> as a profiling tool to help discover where your +optimization efforts will best affect your code. You can also use +<code>gcov</code> along with the other profiling tool, <code>gprof</code>, to +assess which parts of your code use the greatest amount of computing +time. +</p> +<p>Profiling tools help you analyze your code’s performance. Using a +profiler such as <code>gcov</code> or <code>gprof</code>, you can find out some +basic performance statistics, such as: +</p> +<ul> +<li> how often each line of code executes + +</li><li> what lines of code are actually executed + +</li><li> how much computing time each section of code uses +</li></ul> + +<p>Once you know these things about how your code works when compiled, you +can look at each module to see which modules should be optimized. +<code>gcov</code> helps you determine where to work on optimization. +</p> +<p>Software developers also use coverage testing in concert with +testsuites, to make sure software is actually good enough for a release. +Testsuites can verify that a program works as expected; a coverage +program tests to see how much of the program is exercised by the +testsuite. Developers can then determine what kinds of test cases need +to be added to the testsuites to create both better testing and a better +final product. +</p> +<p>You should compile your code without optimization if you plan to use +<code>gcov</code> because the optimization, by combining some lines of code +into one function, may not give you as much information as you need to +look for ‘hot spots’ where the code is using a great deal of computer +time. Likewise, because <code>gcov</code> accumulates statistics by line (at +the lowest resolution), it works best with a programming style that +places only one statement on each line. If you use complicated macros +that expand to loops or to other control structures, the statistics are +less helpful—they only report on the line where the macro call +appears. If your complex macros behave like functions, you can replace +them with inline functions to solve this problem. +</p> +<p><code>gcov</code> creates a logfile called <samp><var>sourcefile</var>.gcov</samp> which +indicates how many times each line of a source file <samp><var>sourcefile</var>.c</samp> +has executed. You can use these logfiles along with <code>gprof</code> to aid +in fine-tuning the performance of your programs. <code>gprof</code> gives +timing information you can use along with the information you get from +<code>gcov</code>. +</p> +<p><code>gcov</code> works only on code compiled with GCC. It is not +compatible with any other profiling or test coverage mechanism. +</p> + +<hr> +<div class="header"> +<p> +Next: <a href="Invoking-Gcov.html#Invoking-Gcov" accesskey="n" rel="next">Invoking Gcov</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="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |