80 lines
3.5 KiB
HTML
80 lines
3.5 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>Memory Usage - Untitled</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Untitled">
|
||
|
|
<meta name="generator" content="makeinfo 4.7">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="BFD-front-end.html#BFD-front-end" title="BFD front end">
|
||
|
|
<link rel="prev" href="BFD-front-end.html#BFD-front-end" title="BFD front end">
|
||
|
|
<link rel="next" href="Initialization.html#Initialization" title="Initialization">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
This file documents the BFD library.
|
||
|
|
|
||
|
|
Copyright (C) 1991, 2000, 2001, 2003, 2006, 2007 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.1 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being ``GNU General Public License'' and ``Funding
|
||
|
|
Free Software'', the Front-Cover texts being (a) (see below), and with
|
||
|
|
the Back-Cover Texts being (b) (see below). A copy of the license is
|
||
|
|
included in the section entitled ``GNU Free Documentation License''.
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development.-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family: serif; font-weight: normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<p>
|
||
|
|
<a name="Memory-Usage"></a>Next: <a rel="next" accesskey="n" href="Initialization.html#Initialization">Initialization</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="BFD-front-end.html#BFD-front-end">BFD front end</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="BFD-front-end.html#BFD-front-end">BFD front end</a>
|
||
|
|
<hr><br>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h3 class="section">2.4 Memory Usage</h3>
|
||
|
|
|
||
|
|
<p>BFD keeps all of its internal structures in obstacks. There is one obstack
|
||
|
|
per open BFD file, into which the current state is stored. When a BFD is
|
||
|
|
closed, the obstack is deleted, and so everything which has been
|
||
|
|
allocated by BFD for the closing file is thrown away.
|
||
|
|
|
||
|
|
<p>BFD does not free anything created by an application, but pointers into
|
||
|
|
<code>bfd</code> structures become invalid on a <code>bfd_close</code>; for example,
|
||
|
|
after a <code>bfd_close</code> the vector passed to
|
||
|
|
<code>bfd_canonicalize_symtab</code> is still around, since it has been
|
||
|
|
allocated by the application, but the data that it pointed to are
|
||
|
|
lost.
|
||
|
|
|
||
|
|
<p>The general rule is to not close a BFD until all operations dependent
|
||
|
|
upon data from the BFD have been completed, or all the data from within
|
||
|
|
the file has been copied. To help with the management of memory, there
|
||
|
|
is a function (<code>bfd_alloc_size</code>) which returns the number of bytes
|
||
|
|
in obstacks associated with the supplied BFD. This could be used to
|
||
|
|
select the greediest open BFD, close it to reclaim the memory, perform
|
||
|
|
some operation and reopen the BFD again, to get a fresh copy of the data
|
||
|
|
structures.
|
||
|
|
|
||
|
|
</body></html>
|
||
|
|
|