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Node:<a name="BFD%20outline">BFD outline</a>,

Up:<a rel="up" accesskey="u" href="BFD.html#BFD">BFD</a>

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<h3 class="section">How it works: an outline of BFD</h3>



   <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>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.



<ul class="menu">

<li><a accesskey="1" href="BFD-information-loss.html#BFD%20information%20loss">BFD information loss</a>: 	Information Loss

<li><a accesskey="2" href="Canonical-format.html#Canonical%20format">Canonical format</a>: 		The BFD	canonical object-file format

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