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106 lines
4.6 KiB
HTML
106 lines
4.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the BFD library.
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Copyright (C) 1991-2019 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 1.3 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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funds for GNU development. -->
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<head>
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<title>Memory Usage (Untitled Document)</title>
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<meta name="description" content="Memory Usage (Untitled Document)">
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<meta name="keywords" content="Memory Usage (Untitled Document)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="BFD-front-end.html#BFD-front-end" rel="up" title="BFD front end">
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<link href="Initialization.html#Initialization" rel="next" title="Initialization">
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<link href="Miscellaneous.html#Miscellaneous" rel="prev" title="Miscellaneous">
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</head>
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<body lang="en">
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<a name="Memory-Usage"></a>
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<div class="header">
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<p>
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Next: <a href="Initialization.html#Initialization" accesskey="n" rel="next">Initialization</a>, Previous: <a href="Miscellaneous.html#Miscellaneous" accesskey="p" rel="prev">Miscellaneous</a>, Up: <a href="BFD-front-end.html#BFD-front-end" accesskey="u" rel="up">BFD front end</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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</div>
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<hr>
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<a name="Memory-Usage-1"></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>
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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>
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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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</p>
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</body>
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</html>
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