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Node:<a name="Stab">Stab</a>,

Next:<a rel="next" accesskey="n" href="String.html#String">String</a>,

Previous:<a rel="previous" accesskey="p" href="Space.html#Space">Space</a>,

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<h3 class="section"><code>.stabd, .stabn, .stabs</code></h3>



   <p>There are three directives that begin <code>.stab</code>. 

All emit symbols (see <a href="Symbols.html#Symbols">Symbols</a>), for use by symbolic debuggers. 

The symbols are not entered in the <code>as</code> hash table: they

cannot be referenced elsewhere in the source file. 

Up to five fields are required:



     <dl>

<dt><var>string</var>

     <dd>This is the symbol's name.  It may contain any character except

<code>\000</code>, so is more general than ordinary symbol names.  Some

debuggers used to code arbitrarily complex structures into symbol names

using this field.



     <br><dt><var>type</var>

     <dd>An absolute expression.  The symbol's type is set to the low 8 bits of

this expression.  Any bit pattern is permitted, but <code>ld</code>

and debuggers choke on silly bit patterns.



     <br><dt><var>other</var>

     <dd>An absolute expression.  The symbol's "other" attribute is set to the

low 8 bits of this expression.



     <br><dt><var>desc</var>

     <dd>An absolute expression.  The symbol's descriptor is set to the low 16

bits of this expression.



     <br><dt><var>value</var>

     <dd>An absolute expression which becomes the symbol's value. 

</dl>



   <p>If a warning is detected while reading a <code>.stabd</code>, <code>.stabn</code>,

or <code>.stabs</code> statement, the symbol has probably already been created;

you get a half-formed symbol in your object file.  This is

compatible with earlier assemblers!



     <dl>

<dt><code>.stabd </code><var>type</var><code> , </code><var>other</var><code> , </code><var>desc</var><code></code>

     <dd>

The "name" of the symbol generated is not even an empty string. 

It is a null pointer, for compatibility.  Older assemblers used a

null pointer so they didn't waste space in object files with empty

strings.



     <p>The symbol's value is set to the location counter,

relocatably.  When your program is linked, the value of this symbol

is the address of the location counter when the <code>.stabd</code> was

assembled.



     <br><dt><code>.stabn </code><var>type</var><code> , </code><var>other</var><code> , </code><var>desc</var><code> , </code><var>value</var><code></code>

     <dd>The name of the symbol is set to the empty string <code>""</code>.



     <br><dt><code>.stabs </code><var>string</var><code> ,  </code><var>type</var><code> , </code><var>other</var><code> , </code><var>desc</var><code> , </code><var>value</var><code></code>

     <dd>All five fields are specified. 

</dl>



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