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| <h3 class="section">1.2 Overview of Stab Format</h3> |
| |
| <p>There are three overall formats for stab assembler directives, |
| differentiated by the first word of the stab. The name of the directive |
| describes which combination of four possible data fields follows. It is |
| either <code>.stabs</code> (string), <code>.stabn</code> (number), or <code>.stabd</code> |
| (dot). IBM's XCOFF assembler uses <code>.stabx</code> (and some other |
| directives such as <code>.file</code> and <code>.bi</code>) instead of |
| <code>.stabs</code>, <code>.stabn</code> or <code>.stabd</code>. |
| |
| <p>The overall format of each class of stab is: |
| |
| <pre class="example"> .stabs "<var>string</var>",<var>type</var>,<var>other</var>,<var>desc</var>,<var>value</var> |
| .stabn <var>type</var>,<var>other</var>,<var>desc</var>,<var>value</var> |
| .stabd <var>type</var>,<var>other</var>,<var>desc</var> |
| .stabx "<var>string</var>",<var>value</var>,<var>type</var>,<var>sdb-type</var> |
| </pre> |
| <!-- what is the correct term for "current file location"? My AIX --> |
| <!-- assembler manual calls it "the value of the current location counter". --> |
| <p>For <code>.stabn</code> and <code>.stabd</code>, there is no <var>string</var> (the |
| <code>n_strx</code> field is zero; see <a href="Symbol-Tables.html#Symbol-Tables">Symbol Tables</a>). For |
| <code>.stabd</code>, the <var>value</var> field is implicit and has the value of |
| the current file location. For <code>.stabx</code>, the <var>sdb-type</var> field |
| is unused for stabs and can always be set to zero. The <var>other</var> |
| field is almost always unused and can be set to zero. |
| |
| <p>The number in the <var>type</var> field gives some basic information about |
| which type of stab this is (or whether it <em>is</em> a stab, as opposed |
| to an ordinary symbol). Each valid type number defines a different stab |
| type; further, the stab type defines the exact interpretation of, and |
| possible values for, any remaining <var>string</var>, <var>desc</var>, or |
| <var>value</var> fields present in the stab. See <a href="Stab-Types.html#Stab-Types">Stab Types</a>, for a list |
| in numeric order of the valid <var>type</var> field values for stab directives. |
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