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| <a name="Write-Other-Derived-Routines"></a>Previous: <a rel="previous" accesskey="p" href="Write-the-Derived-Creation-Routine.html#Write-the-Derived-Creation-Routine">Write the Derived Creation Routine</a>, | ||||
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 | ||||
| <h5 class="subsubsection">2.18.4.3 Write other derived routines</h5> | ||||
| 
 | ||||
| <p>You will want to write other routines for your new hash table, | ||||
| as well. | ||||
| 
 | ||||
|    <p>You will want an initialization routine which calls the | ||||
| initialization routine of the hash table you are deriving from | ||||
| and initializes any other local fields.  For the linker hash | ||||
| table, this is <code>_bfd_link_hash_table_init</code> in <code>linker.c</code>. | ||||
| 
 | ||||
|    <p>You will want a lookup routine which calls the lookup routine | ||||
| of the hash table you are deriving from and casts the result.  | ||||
| The linker hash table uses <code>bfd_link_hash_lookup</code> in | ||||
| <code>linker.c</code> (this actually takes an additional argument which | ||||
| it uses to decide how to return the looked up value). | ||||
| 
 | ||||
|    <p>You may want a traversal routine.  This should just call the | ||||
| traversal routine of the hash table you are deriving from with | ||||
| appropriate casts.  The linker hash table uses | ||||
| <code>bfd_link_hash_traverse</code> in <code>linker.c</code>. | ||||
| 
 | ||||
|    <p>These routines may simply be defined as macros.  For example, | ||||
| the a.out backend linker hash table, which is derived from the | ||||
| linker hash table, uses macros for the lookup and traversal | ||||
| routines.  These are <code>aout_link_hash_lookup</code> and | ||||
| <code>aout_link_hash_traverse</code> in aoutx.h. | ||||
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