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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  16. <title>Enumerations (STABS)</title>

  17. 

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  25. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  26. <link href="Types.html#Types" rel="up" title="Types">

  27. <link href="Structures.html#Structures" rel="next" title="Structures">

  28. <link href="Strings.html#Strings" rel="prev" title="Strings">

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  61. <a name="Enumerations"></a>

  62. <div class="header">

  63. <p>

  64. Next: <a href="Structures.html#Structures" accesskey="n" rel="next">Structures</a>, Previous: <a href="Strings.html#Strings" accesskey="p" rel="prev">Strings</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> &nbsp; [<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>

  65. </div>

  66. <hr>

  67. <a name="Enumerations-1"></a>

  68. <h3 class="section">5.7 Enumerations</h3>

  69. 

  70. <p>Enumerations are defined with the &lsquo;<samp>e</samp>&rsquo; type descriptor.

  71. </p>

  72. <p>The source line below declares an enumeration type at file scope.

  73. The type definition is located after the <code>N_RBRAC</code> that marks the end of

  74. the previous procedure&rsquo;s block scope, and before the <code>N_FUN</code> that marks

  75. the beginning of the next procedure&rsquo;s block scope.  Therefore it does not

  76. describe a block local symbol, but a file local one.

  77. </p>

  78. <p>The source line:

  79. </p>

  80. <div class="example">

  81. <pre class="example">enum e_places {first,second=3,last};

  82. </pre></div>

  83. 

  84. <p>generates the following stab:

  85. </p>

  86. <div class="example">

  87. <pre class="example">.stabs &quot;e_places:T22=efirst:0,second:3,last:4,;&quot;,128,0,0,0

  88. </pre></div>

  89. 

  90. <p>The symbol descriptor (&lsquo;<samp>T</samp>&rsquo;) says that the stab describes a

  91. structure, enumeration, or union tag.  The type descriptor &lsquo;<samp>e</samp>&rsquo;,

  92. following the &lsquo;<samp>22=</samp>&rsquo; of the type definition narrows it down to an

  93. enumeration type.  Following the &lsquo;<samp>e</samp>&rsquo; is a list of the elements of

  94. the enumeration.  The format is &lsquo;<samp><var>name</var>:<var>value</var>,</samp>&rsquo;.  The

  95. list of elements ends with &lsquo;<samp>;</samp>&rsquo;.  The fact that <var>value</var> is

  96. specified as an integer can cause problems if the value is large.  GCC

  97. 2.5.2 tries to output it in octal in that case with a leading zero,

  98. which is probably a good thing, although GDB 4.11 supports octal only in

  99. cases where decimal is perfectly good.  Negative decimal values are

  100. supported by both GDB and dbx.

  101. </p>

  102. <p>There is no standard way to specify the size of an enumeration type; it

  103. is determined by the architecture (normally all enumerations types are

  104. 32 bits).  Type attributes can be used to specify an enumeration type of

  105. another size for debuggers which support them; see <a href="String-Field.html#String-Field">String Field</a>.

  106. </p>

  107. <p>Enumeration types are unusual in that they define symbols for the

  108. enumeration values (<code>first</code>, <code>second</code>, and <code>third</code> in the

  109. above example), and even though these symbols are visible in the file as

  110. a whole (rather than being in a more local namespace like structure

  111. member names), they are defined in the type definition for the

  112. enumeration type rather than each having their own symbol.  In order to

  113. be fast, GDB will only get symbols from such types (in its initial scan

  114. of the stabs) if the type is the first thing defined after a &lsquo;<samp>T</samp>&rsquo; or

  115. &lsquo;<samp>t</samp>&rsquo; symbol descriptor (the above example fulfills this

  116. requirement).  If the type does not have a name, the compiler should

  117. emit it in a nameless stab (see <a href="String-Field.html#String-Field">String Field</a>); GCC does this.

  118. </p>

  119. <hr>

  120. <div class="header">

  121. <p>

  122. Next: <a href="Structures.html#Structures" accesskey="n" rel="next">Structures</a>, Previous: <a href="Strings.html#Strings" accesskey="p" rel="prev">Strings</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> &nbsp; [<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>

  123. </div>

  124. 

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