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| <a name="Creating-a-Linker-Hash-Table"></a> |
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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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| <a name="Creating-a-linker-hash-table"></a> |
| <h4 class="subsection">2.17.1 Creating a linker hash table</h4> |
| <a name="index-_005fbfd_005flink_005fhash_005ftable_005fcreate-in-target-vector"></a> |
| <a name="index-target-vector-_0028_005fbfd_005flink_005fhash_005ftable_005fcreate_0029"></a> |
| <p>The linker routines must create a hash table, which must be |
| derived from <code>struct bfd_link_hash_table</code> described in |
| <code>bfdlink.c</code>. See <a href="Hash-Tables.html#Hash-Tables">Hash Tables</a>, for information on how to |
| create a derived hash table. This entry point is called using |
| the target vector of the linker output file. |
| </p> |
| <p>The <code>_bfd_link_hash_table_create</code> entry point must allocate |
| and initialize an instance of the desired hash table. If the |
| back end does not require any additional information to be |
| stored with the entries in the hash table, the entry point may |
| simply create a <code>struct bfd_link_hash_table</code>. Most likely, |
| however, some additional information will be needed. |
| </p> |
| <p>For example, with each entry in the hash table the a.out |
| linker keeps the index the symbol has in the final output file |
| (this index number is used so that when doing a relocatable |
| link the symbol index used in the output file can be quickly |
| filled in when copying over a reloc). The a.out linker code |
| defines the required structures and functions for a hash table |
| derived from <code>struct bfd_link_hash_table</code>. The a.out linker |
| hash table is created by the function |
| <code>NAME(aout,link_hash_table_create)</code>; it simply allocates |
| space for the hash table, initializes it, and returns a |
| pointer to it. |
| </p> |
| <p>When writing the linker routines for a new back end, you will |
| generally not know exactly which fields will be required until |
| you have finished. You should simply create a new hash table |
| which defines no additional fields, and then simply add fields |
| as they become necessary. |
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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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