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107 lines
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HTML
107 lines
5.0 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1992-2019 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon,
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and David MacKenzie.
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Permission is granted to copy, distribute and/or modify this document
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any later version published by the Free Software Foundation; with no
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Free Documentation License". -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Stabs Format (STABS)</title>
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<meta name="description" content="Stabs Format (STABS)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Overview.html#Overview" rel="up" title="Overview">
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<link href="String-Field.html#String-Field" rel="next" title="String Field">
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<a name="Stabs-Format"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Overview-of-Stab-Format"></a>
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<h3 class="section">1.2 Overview of Stab Format</h3>
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<p>There are three overall formats for stab assembler directives,
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differentiated by the first word of the stab. The name of the directive
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describes which combination of four possible data fields follows. It is
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either <code>.stabs</code> (string), <code>.stabn</code> (number), or <code>.stabd</code>
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(dot). IBM’s XCOFF assembler uses <code>.stabx</code> (and some other
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directives such as <code>.file</code> and <code>.bi</code>) instead of
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<code>.stabs</code>, <code>.stabn</code> or <code>.stabd</code>.
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</p>
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<p>The overall format of each class of stab is:
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</p>
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<div class="example">
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<pre class="example">.stabs "<var>string</var>",<var>type</var>,<var>other</var>,<var>desc</var>,<var>value</var>
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.stabn <var>type</var>,<var>other</var>,<var>desc</var>,<var>value</var>
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.stabd <var>type</var>,<var>other</var>,<var>desc</var>
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.stabx "<var>string</var>",<var>value</var>,<var>type</var>,<var>sdb-type</var>
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</pre></div>
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<p>For <code>.stabn</code> and <code>.stabd</code>, there is no <var>string</var> (the
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<code>n_strx</code> field is zero; see <a href="Symbol-Tables.html#Symbol-Tables">Symbol Tables</a>). For
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<code>.stabd</code>, the <var>value</var> field is implicit and has the value of
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the current file location. For <code>.stabx</code>, the <var>sdb-type</var> field
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is unused for stabs and can always be set to zero. The <var>other</var>
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field is almost always unused and can be set to zero.
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</p>
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<p>The number in the <var>type</var> field gives some basic information about
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which type of stab this is (or whether it <em>is</em> a stab, as opposed
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to an ordinary symbol). Each valid type number defines a different stab
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type; further, the stab type defines the exact interpretation of, and
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possible values for, any remaining <var>string</var>, <var>desc</var>, or
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<var>value</var> fields present in the stab. See <a href="Stab-Types.html#Stab-Types">Stab Types</a>, for a list
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in numeric order of the valid <var>type</var> field values for stab directives.
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</p>
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</body>
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</html>
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