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79 lines
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<a name="Memory-Usage"></a>Next: <a rel="next" accesskey="n" href="Initialization.html#Initialization">Initialization</a>,
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Previous: <a rel="previous" accesskey="p" href="BFD-front-end.html#BFD-front-end">BFD front end</a>,
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<h3 class="section">2.4 Memory Usage</h3>
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<p>BFD keeps all of its internal structures in obstacks. There is one obstack
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per open BFD file, into which the current state is stored. When a BFD is
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closed, the obstack is deleted, and so everything which has been
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allocated by BFD for the closing file is thrown away.
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<p>BFD does not free anything created by an application, but pointers into
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<code>bfd</code> structures become invalid on a <code>bfd_close</code>; for example,
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after a <code>bfd_close</code> the vector passed to
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<code>bfd_canonicalize_symtab</code> is still around, since it has been
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allocated by the application, but the data that it pointed to are
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lost.
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<p>The general rule is to not close a BFD until all operations dependent
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upon data from the BFD have been completed, or all the data from within
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the file has been copied. To help with the management of memory, there
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is a function (<code>bfd_alloc_size</code>) which returns the number of bytes
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in obstacks associated with the supplied BFD. This could be used to
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select the greediest open BFD, close it to reclaim the memory, perform
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some operation and reopen the BFD again, to get a fresh copy of the data
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structures.
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