82 lines
4.1 KiB
HTML
82 lines
4.1 KiB
HTML
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<html lang="en">
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<head>
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<title>Stabs Format - STABS</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="STABS">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Overview.html#Overview" title="Overview">
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<link rel="prev" href="Flow.html#Flow" title="Flow">
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<link rel="next" href="String-Field.html#String-Field" title="String Field">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled ``GNU
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Free Documentation License''.-->
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</head>
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<body>
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<div class="node">
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<a name="Stabs-Format"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="String-Field.html#String-Field">String Field</a>,
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Previous: <a rel="previous" accesskey="p" href="Flow.html#Flow">Flow</a>,
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Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a>
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<hr>
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</div>
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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>The overall format of each class of stab is:
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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>
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<!-- what is the correct term for "current file location"? My AIX -->
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<!-- assembler manual calls it "the value of the current location counter". -->
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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>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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</body></html>
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