llvm-6502/docs/CommandGuide/extract.html

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LLVM: extract tool
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<h1>LLVM: <tt>extract</tt> tool</h1>
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<h3>NAME</h3>
<tt>extract</tt>
<h3>
SYNOPSIS
</h3>
<tt>extract [options] [filename]</tt>
<h3>
DESCRIPTION
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The <tt>extract</tt> command takes the name of a function and extracts it from
the specified LLVM bytecode file. It is primarily used as a debugging tool to
reduce test cases from larger programs that are triggering a bug.
<p>
In addition to extracting the bytecode of the specified function,
<tt>extract</tt> will also remove unreachable global variables, prototypes, and
unused types.
<p>
The <tt>extract</tt> command reads its input from standard input if filename is
omitted or if filename is -. The output is always written to standard output.
<h3>OPTIONS</h3>
<ul>
<ul>
<li> -f
<br>
Force overwrite. Normally, <tt>extract</tt> will refuse to overwrite an
output file that already exists. With this option, <tt>extract</tt>
will overwrite the output file and replace it with new bytecode.
<p>
<li>-func &lt;function&gt;
<br>
Extract the specified function from the LLVM bytecode.
<p>
<li> -help
<br>
Print a summary of command line options.
<p>
<li> -o &lt;filename&gt;
<br>
Specify the output filename. If filename is "-" (the default), then
<tt>extract</tt> sends its output to standard output.
<p>
</ul>
<h3>
EXIT STATUS
</h3>
If <tt>extract</tt> succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value.
<h3>
SEE ALSO
</h3>
<a href="bugpoint.html"><tt>bugpoint</tt></a>
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Maintained by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>.
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