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<title>STABS: Typedefs</title>
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<a name="Typedefs"></a>
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<p>
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Next: <a href="Unions.html#Unions" accesskey="n" rel="next">Unions</a>, Previous: <a href="Structures.html#Structures" accesskey="p" rel="previous">Structures</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Giving-a-Type-a-Name"></a>
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<h3 class="section">5.9 Giving a Type a Name</h3>
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<a name="index-N_005fLSYM_002c-for-types"></a>
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<a name="index-C_005fDECL_002c-for-types"></a>
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<p>To give a type a name, use the ‘<samp>t</samp>’ symbol descriptor. The type
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is specified by the type information (see <a href="String-Field.html#String-Field">String Field</a>) for the stab.
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For example,
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</p>
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<div class="example">
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<pre class="example">.stabs "s_typedef:t16",128,0,0,0 # <span class="roman">128 is N_LSYM</span>
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</pre></div>
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<p>specifies that <code>s_typedef</code> refers to type number 16. Such stabs
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have symbol type <code>N_LSYM</code> (or <code>C_DECL</code> for XCOFF). (The Sun
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documentation mentions using <code>N_GSYM</code> in some cases).
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</p>
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<p>If you are specifying the tag name for a structure, union, or
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enumeration, use the ‘<samp>T</samp>’ symbol descriptor instead. I believe C is
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the only language with this feature.
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</p>
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<p>If the type is an opaque type (I believe this is a Modula-2 feature),
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AIX provides a type descriptor to specify it. The type descriptor is
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‘<samp>o</samp>’ and is followed by a name. I don’t know what the name
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means—is it always the same as the name of the type, or is this type
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descriptor used with a nameless stab (see <a href="String-Field.html#String-Field">String Field</a>)? There
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optionally follows a comma followed by type information which defines
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the type of this type. If omitted, a semicolon is used in place of the
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comma and the type information, and the type is much like a generic
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pointer type—it has a known size but little else about it is
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specified.
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