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- Up: <a href="BFD.html#BFD" accesskey="u" rel="up">BFD</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
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- <a name="How-It-Works_003a-An-Outline-of-BFD"></a>
- <h3 class="section">5.1 How It Works: An Outline of BFD</h3>
- <a name="index-opening-object-files"></a>
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- <p>When an object file is opened, BFD subroutines automatically determine
- the format of the input object file. They then build a descriptor in
- memory with pointers to routines that will be used to access elements of
- the object file’s data structures.
- </p>
- <p>As different information from the object files is required,
- BFD reads from different sections of the file and processes them.
- For example, a very common operation for the linker is processing symbol
- tables. Each BFD back end provides a routine for converting
- between the object file’s representation of symbols and an internal
- canonical format. When the linker asks for the symbol table of an object
- file, it calls through a memory pointer to the routine from the
- relevant BFD back end which reads and converts the table into a canonical
- form. The linker then operates upon the canonical form. When the link is
- finished and the linker writes the output file’s symbol table,
- another BFD back end routine is called to take the newly
- created symbol table and convert it into the chosen output format.
- </p>
- <table class="menu" border="0" cellspacing="0">
- <tr><td align="left" valign="top">• <a href="BFD-information-loss.html#BFD-information-loss" accesskey="1">BFD information loss</a>:</td><td> </td><td align="left" valign="top">Information Loss
- </td></tr>
- <tr><td align="left" valign="top">• <a href="Canonical-format.html#Canonical-format" accesskey="2">Canonical format</a>:</td><td> </td><td align="left" valign="top">The BFD canonical object-file format
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