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80 lines
3.5 KiB
HTML
80 lines
3.5 KiB
HTML
15 years ago
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<title>Memory Usage - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.7">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="BFD-front-end.html#BFD-front-end" title="BFD front end">
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<link rel="prev" href="BFD-front-end.html#BFD-front-end" title="BFD front end">
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<link rel="next" href="Initialization.html#Initialization" title="Initialization">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the BFD library.
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Copyright (C) 1991, 2000, 2001, 2003, 2006, 2007 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 1.1 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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--></style>
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</head>
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<body>
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<div class="node">
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<p>
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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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Up: <a rel="up" accesskey="u" href="BFD-front-end.html#BFD-front-end">BFD front end</a>
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<hr><br>
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</div>
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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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</body></html>
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