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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 | 6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch) | |
| tree | 1c2a6a60531acf791531bbd9c8ac14c23ef8a66c /share/doc/stabs/Global-Variables.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
Diffstat (limited to 'share/doc/stabs/Global-Variables.html')
| -rw-r--r-- | share/doc/stabs/Global-Variables.html | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/share/doc/stabs/Global-Variables.html b/share/doc/stabs/Global-Variables.html new file mode 100644 index 0000000..7b567aa --- /dev/null +++ b/share/doc/stabs/Global-Variables.html @@ -0,0 +1,109 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1992-2023 Free Software Foundation, Inc. +Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, +and David MacKenzie. + +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 no +Invariant Sections, with no Front-Cover Texts, and with no Back-Cover +Texts. A copy of the license is included in the section entitled "GNU +Free Documentation License". --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>STABS: Global Variables</title> + +<meta name="description" content="STABS: Global Variables"> +<meta name="keywords" content="STABS: Global Variables"> +<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="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Variables.html#Variables" rel="up" title="Variables"> +<link href="Register-Variables.html#Register-Variables" rel="next" title="Register Variables"> +<link href="Stack-Variables.html#Stack-Variables" rel="previous" title="Stack Variables"> +<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="Global-Variables"></a> +<div class="header"> +<p> +Next: <a href="Register-Variables.html#Register-Variables" accesskey="n" rel="next">Register Variables</a>, Previous: <a href="Stack-Variables.html#Stack-Variables" accesskey="p" rel="previous">Stack Variables</a>, Up: <a href="Variables.html#Variables" accesskey="u" rel="up">Variables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Global-Variables-1"></a> +<h3 class="section">4.2 Global Variables</h3> + +<a name="index-N_005fGSYM"></a> +<a name="index-C_005fGSYM"></a> +<p>A variable whose scope is not specific to just one source file is +represented by the ‘<samp>G</samp>’ symbol descriptor. These stabs use the +<code>N_GSYM</code> stab type (C_GSYM for XCOFF). The type information for +the stab (see <a href="String-Field.html#String-Field">String Field</a>) gives the type of the variable. +</p> +<p>For example, the following source code: +</p> +<div class="example"> +<pre class="example">char g_foo = 'c'; +</pre></div> + +<p>yields the following assembly code: +</p> +<div class="example"> +<pre class="example">.stabs "g_foo:G2",32,0,0,0 # <span class="roman">32 is N_GSYM</span> + .global _g_foo + .data +_g_foo: + .byte 99 +</pre></div> + +<p>The address of the variable represented by the <code>N_GSYM</code> is not +contained in the <code>N_GSYM</code> stab. The debugger gets this information +from the external symbol for the global variable. In the example above, +the <code>.global _g_foo</code> and <code>_g_foo:</code> lines tell the assembler to +produce an external symbol. +</p> +<p>Some compilers, like GCC, output <code>N_GSYM</code> stabs only once, where +the variable is defined. Other compilers, like SunOS4 /bin/cc, output a +<code>N_GSYM</code> stab for each compilation unit which references the +variable. +</p> + + + +</body> +</html> |