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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/gccint/gcov-Testing.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
Diffstat (limited to 'share/doc/gccint/gcov-Testing.html')
| -rw-r--r-- | share/doc/gccint/gcov-Testing.html | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/share/doc/gccint/gcov-Testing.html b/share/doc/gccint/gcov-Testing.html new file mode 100644 index 0000000..594f1fc --- /dev/null +++ b/share/doc/gccint/gcov-Testing.html @@ -0,0 +1,152 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- 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>GNU Compiler Collection (GCC) Internals: gcov Testing</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: gcov Testing"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: gcov Testing"> +<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="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Testsuites.html#Testsuites" rel="up" title="Testsuites"> +<link href="profopt-Testing.html#profopt-Testing" rel="next" title="profopt Testing"> +<link href="LTO-Testing.html#LTO-Testing" rel="previous" title="LTO Testing"> +<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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="gcov-Testing"></a> +<div class="header"> +<p> +Next: <a href="profopt-Testing.html#profopt-Testing" accesskey="n" rel="next">profopt Testing</a>, Previous: <a href="LTO-Testing.html#LTO-Testing" accesskey="p" rel="previous">LTO Testing</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</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> +</div> +<hr> +<a name="Support-for-testing-gcov"></a> +<h3 class="section">7.6 Support for testing <code>gcov</code></h3> + +<p>Language-independent support for testing <code>gcov</code>, and for checking +that branch profiling produces expected values, is provided by the +expect file <samp>lib/gcov.exp</samp>. <code>gcov</code> tests also rely on procedures +in <samp>lib/gcc-dg.exp</samp> to compile and run the test program. A typical +<code>gcov</code> test contains the following DejaGnu commands within comments: +</p> +<div class="smallexample"> +<pre class="smallexample">{ dg-options "--coverage" } +{ dg-do run { target native } } +{ dg-final { run-gcov sourcefile } } +</pre></div> + +<p>Checks of <code>gcov</code> output can include line counts, branch percentages, +and call return percentages. All of these checks are requested via +commands that appear in comments in the test’s source file. +Commands to check line counts are processed by default. +Commands to check branch percentages and call return percentages are +processed if the <code>run-gcov</code> command has arguments <code>branches</code> +or <code>calls</code>, respectively. For example, the following specifies +checking both, as well as passing <samp>-b</samp> to <code>gcov</code>: +</p> +<div class="smallexample"> +<pre class="smallexample">{ dg-final { run-gcov branches calls { -b sourcefile } } } +</pre></div> + +<p>A line count command appears within a comment on the source line +that is expected to get the specified count and has the form +<code>count(<var>cnt</var>)</code>. A test should only check line counts for +lines that will get the same count for any architecture. +</p> +<p>Commands to check branch percentages (<code>branch</code>) and call +return percentages (<code>returns</code>) are very similar to each other. +A beginning command appears on or before the first of a range of +lines that will report the percentage, and the ending command +follows that range of lines. The beginning command can include a +list of percentages, all of which are expected to be found within +the range. A range is terminated by the next command of the same +kind. A command <code>branch(end)</code> or <code>returns(end)</code> marks +the end of a range without starting a new one. For example: +</p> +<div class="smallexample"> +<pre class="smallexample">if (i > 10 && j > i && j < 20) /* <span class="roman">branch(27 50 75)</span> */ + /* <span class="roman">branch(end)</span> */ + foo (i, j); +</pre></div> + +<p>For a call return percentage, the value specified is the +percentage of calls reported to return. For a branch percentage, +the value is either the expected percentage or 100 minus that +value, since the direction of a branch can differ depending on the +target or the optimization level. +</p> +<p>Not all branches and calls need to be checked. A test should not +check for branches that might be optimized away or replaced with +predicated instructions. Don’t check for calls inserted by the +compiler or ones that might be inlined or optimized away. +</p> +<p>A single test can check for combinations of line counts, branch +percentages, and call return percentages. The command to check a +line count must appear on the line that will report that count, but +commands to check branch percentages and call return percentages can +bracket the lines that report them. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="profopt-Testing.html#profopt-Testing" accesskey="n" rel="next">profopt Testing</a>, Previous: <a href="LTO-Testing.html#LTO-Testing" accesskey="p" rel="previous">LTO Testing</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</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> +</div> + + + +</body> +</html> |