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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

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  17. A GNU Manual

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  26. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  27. <title>Memory Usage (Untitled Document)</title>

  28. 

  29. <meta name="description" content="Memory Usage (Untitled Document)">

  30. <meta name="keywords" content="Memory Usage (Untitled Document)">

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  35. <link href="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">

  36. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  37. <link href="BFD-front-end.html#BFD-front-end" rel="up" title="BFD front end">

  38. <link href="Initialization.html#Initialization" rel="next" title="Initialization">

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  72. <a name="Memory-Usage"></a>

  73. <div class="header">

  74. <p>

  75. 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> &nbsp; [<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>

  76. </div>

  77. <hr>

  78. <a name="Memory-Usage-1"></a>

  79. <h3 class="section">2.4 Memory Usage</h3>

  80. <p>BFD keeps all of its internal structures in obstacks. There is one obstack

  81. per open BFD file, into which the current state is stored. When a BFD is

  82. closed, the obstack is deleted, and so everything which has been

  83. allocated by BFD for the closing file is thrown away.

  84. </p>

  85. <p>BFD does not free anything created by an application, but pointers into

  86. <code>bfd</code> structures become invalid on a <code>bfd_close</code>; for example,

  87. after a <code>bfd_close</code> the vector passed to

  88. <code>bfd_canonicalize_symtab</code> is still around, since it has been

  89. allocated by the application, but the data that it pointed to are

  90. lost.

  91. </p>

  92. <p>The general rule is to not close a BFD until all operations dependent

  93. upon data from the BFD have been completed, or all the data from within

  94. the file has been copied. To help with the management of memory, there

  95. is a function (<code>bfd_alloc_size</code>) which returns the number of bytes

  96. in obstacks associated with the supplied BFD. This could be used to

  97. select the greediest open BFD, close it to reclaim the memory, perform

  98. some operation and reopen the BFD again, to get a fresh copy of the data

  99. structures.

  100. </p>

  101. 

  102. 

  103. 

  104. </body>

  105. </html>