75 lines
3.4 KiB
HTML
75 lines
3.4 KiB
HTML
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<html lang="en">
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<head>
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<title>Symbol Table Format - STABS</title>
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<meta name="description" content="STABS">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Symbol-Tables.html#Symbol-Tables" title="Symbol Tables">
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<link rel="next" href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" title="Transformations On Symbol Tables">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1992-2019 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon,
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and David MacKenzie.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled ``GNU
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Free Documentation License''.-->
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</head>
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<body>
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<div class="node">
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<a name="Symbol-Table-Format"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables">Transformations On Symbol Tables</a>,
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Up: <a rel="up" accesskey="u" href="Symbol-Tables.html#Symbol-Tables">Symbol Tables</a>
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<hr>
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</div>
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<h3 class="section">7.1 Symbol Table Format</h3>
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<p>Each time the assembler encounters a stab directive, it puts
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each field of the stab into a corresponding field in a symbol table
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entry of its output file. If the stab contains a string field, the
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symbol table entry for that stab points to a string table entry
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containing the string data from the stab. Assembler labels become
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relocatable addresses. Symbol table entries in a.out have the format:
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<!-- FIXME: should refer to external, not internal. -->
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<pre class="example"> struct internal_nlist {
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unsigned long n_strx; /* index into string table of name */
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unsigned char n_type; /* type of symbol */
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unsigned char n_other; /* misc info (usually empty) */
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unsigned short n_desc; /* description field */
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bfd_vma n_value; /* value of symbol */
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};
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</pre>
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<p>If the stab has a string, the <code>n_strx</code> field holds the offset in
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bytes of the string within the string table. The string is terminated
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by a NUL character. If the stab lacks a string (for example, it was
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produced by a <code>.stabn</code> or <code>.stabd</code> directive), the
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<code>n_strx</code> field is zero.
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<p>Symbol table entries with <code>n_type</code> field values greater than 0x1f
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originated as stabs generated by the compiler (with one random
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exception). The other entries were placed in the symbol table of the
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executable by the assembler or the linker.
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</body></html>
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