| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1992-2015 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 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>STABS: Stabs Format</title> |
| |
| <meta name="description" content="STABS: Stabs Format"> |
| <meta name="keywords" content="STABS: Stabs Format"> |
| <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="Overview.html#Overview" rel="up" title="Overview"> |
| <link href="String-Field.html#String-Field" rel="next" title="String Field"> |
| <link href="Flow.html#Flow" rel="prev" title="Flow"> |
| <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="Stabs-Format"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="String-Field.html#String-Field" accesskey="n" rel="next">String Field</a>, Previous: <a href="Flow.html#Flow" accesskey="p" rel="prev">Flow</a>, Up: <a href="Overview.html#Overview" accesskey="u" rel="up">Overview</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="Overview-of-Stab-Format"></a> |
| <h3 class="section">1.2 Overview of Stab Format</h3> |
| |
| <p>There are three overall formats for stab assembler directives, |
| differentiated by the first word of the stab. The name of the directive |
| describes which combination of four possible data fields follows. It is |
| either <code>.stabs</code> (string), <code>.stabn</code> (number), or <code>.stabd</code> |
| (dot). IBM’s XCOFF assembler uses <code>.stabx</code> (and some other |
| directives such as <code>.file</code> and <code>.bi</code>) instead of |
| <code>.stabs</code>, <code>.stabn</code> or <code>.stabd</code>. |
| </p> |
| <p>The overall format of each class of stab is: |
| </p> |
| <div class="example"> |
| <pre class="example">.stabs "<var>string</var>",<var>type</var>,<var>other</var>,<var>desc</var>,<var>value</var> |
| .stabn <var>type</var>,<var>other</var>,<var>desc</var>,<var>value</var> |
| .stabd <var>type</var>,<var>other</var>,<var>desc</var> |
| .stabx "<var>string</var>",<var>value</var>,<var>type</var>,<var>sdb-type</var> |
| </pre></div> |
| |
| <p>For <code>.stabn</code> and <code>.stabd</code>, there is no <var>string</var> (the |
| <code>n_strx</code> field is zero; see <a href="Symbol-Tables.html#Symbol-Tables">Symbol Tables</a>). For |
| <code>.stabd</code>, the <var>value</var> field is implicit and has the value of |
| the current file location. For <code>.stabx</code>, the <var>sdb-type</var> field |
| is unused for stabs and can always be set to zero. The <var>other</var> |
| field is almost always unused and can be set to zero. |
| </p> |
| <p>The number in the <var>type</var> field gives some basic information about |
| which type of stab this is (or whether it <em>is</em> a stab, as opposed |
| to an ordinary symbol). Each valid type number defines a different stab |
| type; further, the stab type defines the exact interpretation of, and |
| possible values for, any remaining <var>string</var>, <var>desc</var>, or |
| <var>value</var> fields present in the stab. See <a href="Stab-Types.html#Stab-Types">Stab Types</a>, for a list |
| in numeric order of the valid <var>type</var> field values for stab directives. |
| </p> |
| |
| |
| |
| </body> |
| </html> |
