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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/stabs/Statics.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/stabs/Statics.html b/share/doc/stabs/Statics.html new file mode 100644 index 0000000..1e9f237 --- /dev/null +++ b/share/doc/stabs/Statics.html @@ -0,0 +1,142 @@ +<!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: Statics</title> + +<meta name="description" content="STABS: Statics"> +<meta name="keywords" content="STABS: Statics"> +<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="Based-Variables.html#Based-Variables" rel="next" title="Based Variables"> +<link href="Common-Blocks.html#Common-Blocks" rel="previous" title="Common Blocks"> +<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="Statics"></a> +<div class="header"> +<p> +Next: <a href="Based-Variables.html#Based-Variables" accesskey="n" rel="next">Based Variables</a>, Previous: <a href="Common-Blocks.html#Common-Blocks" accesskey="p" rel="previous">Common Blocks</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="Static-Variables"></a> +<h3 class="section">4.5 Static Variables</h3> + +<p>Initialized static variables are represented by the ‘<samp>S</samp>’ and +‘<samp>V</samp>’ symbol descriptors. ‘<samp>S</samp>’ means file scope static, and +‘<samp>V</samp>’ means procedure scope static. One exception: in XCOFF, IBM’s +xlc compiler always uses ‘<samp>V</samp>’, and whether it is file scope or not +is distinguished by whether the stab is located within a function. +</p> +<a name="index-N_005fSTSYM"></a> +<a name="index-N_005fLCSYM"></a> +<a name="index-N_005fFUN_002c-for-variables"></a> +<a name="index-N_005fROSYM"></a> +<p>In a.out files, <code>N_STSYM</code> means the data section, <code>N_FUN</code> +means the text section, and <code>N_LCSYM</code> means the bss section. For +those systems with a read-only data section separate from the text +section (Solaris), <code>N_ROSYM</code> means the read-only data section. +</p> +<p>For example, the source lines: +</p> +<div class="example"> +<pre class="example">static const int var_const = 5; +static int var_init = 2; +static int var_noinit; +</pre></div> + +<p>yield the following stabs: +</p> +<div class="example"> +<pre class="example">.stabs "var_const:S1",36,0,0,_var_const # <span class="roman">36 is N_FUN</span> +… +.stabs "var_init:S1",38,0,0,_var_init # <span class="roman">38 is N_STSYM</span> +… +.stabs "var_noinit:S1",40,0,0,_var_noinit # <span class="roman">40 is N_LCSYM</span> +</pre></div> + +<a name="index-C_005fSTSYM"></a> +<a name="index-C_005fBSTAT"></a> +<a name="index-C_005fESTAT"></a> +<p>In XCOFF files, the stab type need not indicate the section; +<code>C_STSYM</code> can be used for all statics. Also, each static variable +is enclosed in a static block. A <code>C_BSTAT</code> (emitted with a +‘<samp>.bs</samp>’ assembler directive) symbol begins the static block; its +value is the symbol number of the csect symbol whose value is the +address of the static block, its section is the section of the variables +in that static block, and its name is ‘<samp>.bs</samp>’. A <code>C_ESTAT</code> +(emitted with a ‘<samp>.es</samp>’ assembler directive) symbol ends the static +block; its name is ‘<samp>.es</samp>’ and its value and section are ignored. +</p> +<p>In ECOFF files, the storage class is used to specify the section, so the +stab type need not indicate the section. +</p> +<p>In ELF files, for the SunPRO compiler version 2.0.1, symbol descriptor +‘<samp>S</samp>’ means that the address is absolute (the linker relocates it) +and symbol descriptor ‘<samp>V</samp>’ means that the address is relative to the +start of the relevant section for that compilation unit. SunPRO has +plans to have the linker stop relocating stabs; I suspect that their the +debugger gets the address from the corresponding ELF (not stab) symbol. +I’m not sure how to find which symbol of that name is the right one. +The clean way to do all this would be to have the value of a symbol +descriptor ‘<samp>S</samp>’ symbol be an offset relative to the start of the +file, just like everything else, but that introduces obvious +compatibility problems. For more information on linker stab relocation, +See <a href="ELF-Linker-Relocation.html#ELF-Linker-Relocation">ELF Linker Relocation</a>. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Based-Variables.html#Based-Variables" accesskey="n" rel="next">Based Variables</a>, Previous: <a href="Common-Blocks.html#Common-Blocks" accesskey="p" rel="previous">Common Blocks</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> + + + +</body> +</html> |