blame | history | raw
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2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7 
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<title>Debugging with GDB: Enum Target Types</title>


 


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<a name="Enum-Target-Types-1"></a>


<h3 class="section">G.4 Enum Target Types</h3>


<a name="index-target-descriptions_002c-enum-types"></a>


 


<p>Enum target types are useful in &lsquo;<samp>struct</samp>&rsquo; and &lsquo;<samp>flags</samp>&rsquo;


register descriptions.  See <a href="Target-Description-Format.html#Target-Description-Format">Target Description Format</a>.


</p>


<p>Enum types have a name, size and a list of name/value pairs.


</p>


<div class="smallexample">


<pre class="smallexample">&lt;enum id=&quot;<var>id</var>&quot; size=&quot;<var>size</var>&quot;&gt;


  &lt;evalue name=&quot;<var>name</var>&quot; value=&quot;<var>value</var>&quot;/&gt;


  &hellip;


&lt;/enum&gt;


</pre></div>


 


<p>Enums must be defined before they are used.


</p>


<div class="smallexample">


<pre class="smallexample">&lt;enum id=&quot;levels_type&quot; size=&quot;4&quot;&gt;


  &lt;evalue name=&quot;low&quot; value=&quot;0&quot;/&gt;


  &lt;evalue name=&quot;high&quot; value=&quot;1&quot;/&gt;


&lt;/enum&gt;


&lt;flags id=&quot;flags_type&quot; size=&quot;4&quot;&gt;


  &lt;field name=&quot;X&quot; start=&quot;0&quot;/&gt;


  &lt;field name=&quot;LEVEL&quot; start=&quot;1&quot; end=&quot;1&quot; type=&quot;levels_type&quot;/&gt;


&lt;/flags&gt;


&lt;reg name=&quot;flags&quot; bitsize=&quot;32&quot; type=&quot;flags_type&quot;/&gt;


</pre></div>


 


<p>Given that description, a value of 3 for the &lsquo;<samp>flags</samp>&rsquo; register


would be printed as:


</p>


<div class="smallexample">


<pre class="smallexample">(gdb) info register flags


flags 0x3 [ X LEVEL=high ]


</pre></div>


 


 


 


 


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