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<title>Using as: Stab</title>
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<a name="Stab"></a>
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<div class="header">
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<p>
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Next: <a href="String.html#String" accesskey="n" rel="next">String</a>, Previous: <a href="Space.html#Space" accesskey="p" rel="prev">Space</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="g_t_002estabd_002c-_002estabn_002c-_002estabs"></a>
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<h3 class="section">7.86 <code>.stabd, .stabn, .stabs</code></h3>
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<a name="index-symbolic-debuggers_002c-information-for"></a>
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<a name="index-stabx-directives"></a>
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<p>There are three directives that begin ‘<samp>.stab</samp>’.
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All emit symbols (see <a href="Symbols.html#Symbols">Symbols</a>), for use by symbolic debuggers.
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The symbols are not entered in the <code>as</code> hash table: they
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cannot be referenced elsewhere in the source file.
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Up to five fields are required:
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</p>
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<dl compact="compact">
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<dt><var>string</var></dt>
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<dd><p>This is the symbol’s name. It may contain any character except
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‘<samp>\000</samp>’, so is more general than ordinary symbol names. Some
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debuggers used to code arbitrarily complex structures into symbol names
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using this field.
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</p>
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</dd>
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<dt><var>type</var></dt>
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<dd><p>An absolute expression. The symbol’s type is set to the low 8 bits of
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this expression. Any bit pattern is permitted, but <code>ld</code>
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and debuggers choke on silly bit patterns.
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</p>
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</dd>
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<dt><var>other</var></dt>
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<dd><p>An absolute expression. The symbol’s “other” attribute is set to the
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low 8 bits of this expression.
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</p>
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</dd>
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<dt><var>desc</var></dt>
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<dd><p>An absolute expression. The symbol’s descriptor is set to the low 16
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bits of this expression.
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</p>
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</dd>
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<dt><var>value</var></dt>
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<dd><p>An absolute expression which becomes the symbol’s value.
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</p></dd>
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</dl>
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<p>If a warning is detected while reading a <code>.stabd</code>, <code>.stabn</code>,
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or <code>.stabs</code> statement, the symbol has probably already been created;
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you get a half-formed symbol in your object file. This is
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compatible with earlier assemblers!
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</p>
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<dl compact="compact">
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<dd><a name="index-stabd-directive"></a>
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</dd>
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<dt><code>.stabd <var>type</var> , <var>other</var> , <var>desc</var></code></dt>
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<dd>
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<p>The “name” of the symbol generated is not even an empty string.
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It is a null pointer, for compatibility. Older assemblers used a
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null pointer so they didn’t waste space in object files with empty
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strings.
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</p>
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<p>The symbol’s value is set to the location counter,
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relocatably. When your program is linked, the value of this symbol
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is the address of the location counter when the <code>.stabd</code> was
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assembled.
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</p>
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<a name="index-stabn-directive"></a>
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</dd>
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<dt><code>.stabn <var>type</var> , <var>other</var> , <var>desc</var> , <var>value</var></code></dt>
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<dd><p>The name of the symbol is set to the empty string <code>""</code>.
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</p>
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<a name="index-stabs-directive"></a>
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</dd>
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<dt><code>.stabs <var>string</var> , <var>type</var> , <var>other</var> , <var>desc</var> , <var>value</var></code></dt>
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<dd><p>All five fields are specified.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="String.html#String" accesskey="n" rel="next">String</a>, Previous: <a href="Space.html#Space" accesskey="p" rel="prev">Space</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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