docs/CommandGuide/llvm-nm.html

<html>
<title>
LLVM: llvm-nm tool
</title>

<body bgcolor=white>

<center><h1>LLVM: <tt>llvm-nm</tt> tool</h1></center>
<HR>

<h3>NAME</h3>
<tt>llvm-nm</tt>

<h3>SYNOPSIS</h3>
<tt>llvm-nm [options] [filenames...]</tt>

<h3>DESCRIPTION</h3>

<p>The <tt>llvm-nm</tt> utility lists the names of symbols from the
LLVM bytecode files named on the command line, along with some
ancillary information about each symbol. If no filename is specified,
or - is used as a filename, <tt>llvm-nm</tt> reads its input from standard
input.</p>

<p><tt>llvm-nm</tt>'s default output format is the traditional BSD
<tt>nm(1)</tt> output format. Each such output record consists of an
(optional) 8-digit hexadecimal address, followed by a type code
character, followed by a name, for each symbol. One record is printed
per line; fields are separated by spaces. When the address is omitted,
it is replaced by 8 spaces.</p>

<p>Type code characters currently supported, and their meanings, are
as follows:</p>

<table border>
<tr><td>U</td><td>Named object is referenced but undefined in this
              bytecode file</td></tr>
<tr><td>C</td><td>Common (multiple defs link together into one
              def)</td></tr>
<tr><td>W</td><td>Weak reference (multiple defs link together into zero or
              one defs)</td></tr>
<tr><td>t</td><td>Local function (text) object</td></tr>
<tr><td>T</td><td>Global function (text) object</td></tr>
<tr><td>d</td><td>Local data object</td></tr>
<tr><td>D</td><td>Global data object</td></tr>
<tr><td>?</td><td>Something unrecognizable</td></tr>
</table>

<p>Because LLVM bytecode files typically contain objects that are not
considered to have addresses until they are linked into an executable
image or dynamically compiled "just-in-time", <tt>llvm-nm</tt> does
not print an address for any symbol, even symbols which are defined in
the bytecode file.</p>

<h3>OPTIONS</h3>

<ul>
	<li> -P
	<br>
        Use POSIX.2 output format. Alias for --format=posix.
	<p>
	<li> -B    (default)
	<br>
        Use BSD output format. Alias for --format=bsd.
	<p>

	<li> -help
	<br>
	Print a summary of command-line options and their meanings.
	<p>

	<li> -defined-only
	<br>
	Print only symbols defined in this bytecode file (as opposed
        to symbols which may be referenced by objects in this file,
        but not defined in this file.)
	<p>

	<li> -extern-only, -g
	<br>
	Print only symbols whose definitions are external; that is,
        accessible from other bytecode files.
	<p>

	<li> -undefined-only, -u
	<br>
	Print only symbols referenced but not defined in this bytecode
        file.
	<p>

	<li> -format=<i>fmt</i>, -f
	<br>
	Select an output format; <i>fmt</i> may be sysv, posix, or
        bsd. The default is bsd.
	<p>
</ul>

<h3>BUGS</h3>

<tt>llvm-nm</tt> cannot currently see inside <tt>ar(1)</tt> library
archive files, like <tt>nm(1)</tt> can. It cannot demangle C++ mangled
names, like GNU <tt>nm(1)</tt> can.

<h3>EXIT STATUS</h3>

<tt>llvm-nm</tt> exits with an exit code of zero.

<h3>SEE ALSO</h3>

<a href="llvm-dis.html"><tt>llvm-dis</tt></a>,
<tt>ar(1)</tt>,
<tt>nm(1)</tt>

<HR>
Maintained by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>.
</body>
</html>