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<title>Creating a Linker Hash Table - Untitled</title>
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<a name="Creating-a-Linker-Hash-Table"></a>Next: <a rel="next" accesskey="n" href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table">Adding Symbols to the Hash Table</a>,
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Previous: <a rel="previous" accesskey="p" href="Linker-Functions.html#Linker-Functions">Linker Functions</a>,
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Up: <a rel="up" accesskey="u" href="Linker-Functions.html#Linker-Functions">Linker Functions</a>
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<h4 class="subsection">2.17.1 Creating a linker hash table</h4>
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<p><a name="index-_005fbfd_005flink_005fhash_005ftable_005fcreate-in-target-vector-1369"></a><a name="index-target-vector-_0028_005fbfd_005flink_005fhash_005ftable_005fcreate_0029-1370"></a>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>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>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>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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