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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/Common-Blocks.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/stabs/Common-Blocks.html b/share/doc/stabs/Common-Blocks.html new file mode 100644 index 0000000..074842d --- /dev/null +++ b/share/doc/stabs/Common-Blocks.html @@ -0,0 +1,102 @@ +<!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: Common Blocks</title> + +<meta name="description" content="STABS: Common Blocks"> +<meta name="keywords" content="STABS: Common Blocks"> +<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="Statics.html#Statics" rel="next" title="Statics"> +<link href="Register-Variables.html#Register-Variables" rel="previous" title="Register 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="Common-Blocks"></a> +<div class="header"> +<p> +Next: <a href="Statics.html#Statics" accesskey="n" rel="next">Statics</a>, Previous: <a href="Register-Variables.html#Register-Variables" accesskey="p" rel="previous">Register 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="Common-Blocks-1"></a> +<h3 class="section">4.4 Common Blocks</h3> + +<p>A common block is a statically allocated section of memory which can be +referred to by several source files. It may contain several variables. +I believe Fortran is the only language with this feature. +</p> +<a name="index-N_005fBCOMM"></a> +<a name="index-N_005fECOMM"></a> +<a name="index-C_005fBCOMM"></a> +<a name="index-C_005fECOMM"></a> +<p>A <code>N_BCOMM</code> stab begins a common block and an <code>N_ECOMM</code> stab +ends it. The only field that is significant in these two stabs is the +string, which names a normal (non-debugging) symbol that gives the +address of the common block. According to IBM documentation, only the +<code>N_BCOMM</code> has the name of the common block (even though their +compiler actually puts it both places). +</p> +<a name="index-N_005fECOML"></a> +<a name="index-C_005fECOML"></a> +<p>The stabs for the members of the common block are between the +<code>N_BCOMM</code> and the <code>N_ECOMM</code>; the value of each stab is the +offset within the common block of that variable. IBM uses the +<code>C_ECOML</code> stab type, and there is a corresponding <code>N_ECOML</code> +stab type, but Sun’s Fortran compiler uses <code>N_GSYM</code> instead. The +variables within a common block use the ‘<samp>V</samp>’ symbol descriptor (I +believe this is true of all Fortran variables). Other stabs (at least +type declarations using <code>C_DECL</code>) can also be between the +<code>N_BCOMM</code> and the <code>N_ECOMM</code>. +</p> + + + +</body> +</html> |