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123 lines
6.0 KiB
HTML
123 lines
6.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the BFD library.
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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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 the
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Invariant Sections being "GNU General Public License" and "Funding
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Free Software", the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled "GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Creating a Linker Hash Table (Untitled Document)</title>
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<meta name="description" content="Creating a Linker Hash Table (Untitled Document)">
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<meta name="keywords" content="Creating a Linker Hash Table (Untitled Document)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Linker-Functions.html#Linker-Functions" rel="up" title="Linker Functions">
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<link href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" rel="next" title="Adding Symbols to the Hash Table">
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<link href="Linker-Functions.html#Linker-Functions" rel="prev" title="Linker Functions">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Creating-a-Linker-Hash-Table"></a>
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<div class="header">
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<p>
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Next: <a href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" accesskey="n" rel="next">Adding Symbols to the Hash Table</a>, Previous: <a href="Linker-Functions.html#Linker-Functions" accesskey="p" rel="prev">Linker Functions</a>, Up: <a href="Linker-Functions.html#Linker-Functions" accesskey="u" rel="up">Linker Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Creating-a-linker-hash-table"></a>
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<h4 class="subsection">2.17.1 Creating a linker hash table</h4>
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<a name="index-_005fbfd_005flink_005fhash_005ftable_005fcreate-in-target-vector"></a>
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<a name="index-target-vector-_0028_005fbfd_005flink_005fhash_005ftable_005fcreate_0029"></a>
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<p>The linker routines must create a hash table, which must be
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derived from <code>struct bfd_link_hash_table</code> described in
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<code>bfdlink.c</code>. See <a href="Hash-Tables.html#Hash-Tables">Hash Tables</a>, for information on how to
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create a derived hash table. This entry point is called using
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the target vector of the linker output file.
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</p>
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<p>The <code>_bfd_link_hash_table_create</code> entry point must allocate
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and initialize an instance of the desired hash table. If the
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back end does not require any additional information to be
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stored with the entries in the hash table, the entry point may
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simply create a <code>struct bfd_link_hash_table</code>. Most likely,
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however, some additional information will be needed.
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</p>
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<p>For example, with each entry in the hash table the a.out
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linker keeps the index the symbol has in the final output file
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(this index number is used so that when doing a relocatable
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link the symbol index used in the output file can be quickly
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filled in when copying over a reloc). The a.out linker code
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defines the required structures and functions for a hash table
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derived from <code>struct bfd_link_hash_table</code>. The a.out linker
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hash table is created by the function
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<code>NAME(aout,link_hash_table_create)</code>; it simply allocates
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space for the hash table, initializes it, and returns a
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pointer to it.
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</p>
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<p>When writing the linker routines for a new back end, you will
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generally not know exactly which fields will be required until
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you have finished. You should simply create a new hash table
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which defines no additional fields, and then simply add fields
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as they become necessary.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" accesskey="n" rel="next">Adding Symbols to the Hash Table</a>, Previous: <a href="Linker-Functions.html#Linker-Functions" accesskey="p" rel="prev">Linker Functions</a>, Up: <a href="Linker-Functions.html#Linker-Functions" accesskey="u" rel="up">Linker Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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