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3LLVM: llvm-nm tool
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6<body bgcolor=white>
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8<center><h1>LLVM: <tt>llvm-nm</tt> tool</h1></center>
9<HR>
10
11<h3>NAME</h3>
12<tt>llvm-nm</tt>
13
14<h3>SYNOPSIS</h3>
15<tt>llvm-nm [options] [filenames...]</tt>
16
17<h3>DESCRIPTION</h3>
18
19<p>The <tt>llvm-nm</tt> utility lists the names of symbols from the
Brian Gaekef00785f2003-11-18 06:18:09 +0000[diff] [blame]20LLVM bytecode files, or <tt>ar(1)</tt> archives containing LLVM
21bytecode files, named on the command line. Each symbol is listed along
22with some simple information about its provenance. If no filename is specified,
23or - is used as a filename, <tt>llvm-nm</tt> will process a bytecode file
24on its standard input stream.</p>
Brian Gaekebb24b9c2003-10-16 18:03:24 +0000[diff] [blame]25
26<p><tt>llvm-nm</tt>'s default output format is the traditional BSD
27<tt>nm(1)</tt> output format. Each such output record consists of an
28(optional) 8-digit hexadecimal address, followed by a type code
29character, followed by a name, for each symbol. One record is printed
30per line; fields are separated by spaces. When the address is omitted,
31it is replaced by 8 spaces.</p>
32
33<p>Type code characters currently supported, and their meanings, are
34as follows:</p>
35
36<table border>
37<tr><td>U</td><td>Named object is referenced but undefined in this
38 bytecode file</td></tr>
39<tr><td>C</td><td>Common (multiple defs link together into one
40 def)</td></tr>
41<tr><td>W</td><td>Weak reference (multiple defs link together into zero or
42 one defs)</td></tr>
43<tr><td>t</td><td>Local function (text) object</td></tr>
44<tr><td>T</td><td>Global function (text) object</td></tr>
45<tr><td>d</td><td>Local data object</td></tr>
46<tr><td>D</td><td>Global data object</td></tr>
47<tr><td>?</td><td>Something unrecognizable</td></tr>
48</table>
49
50<p>Because LLVM bytecode files typically contain objects that are not
51considered to have addresses until they are linked into an executable
52image or dynamically compiled "just-in-time", <tt>llvm-nm</tt> does
53not print an address for any symbol, even symbols which are defined in
54the bytecode file.</p>
55
56<h3>OPTIONS</h3>
57
58<ul>
59 <li> -P
60 <br>
61 Use POSIX.2 output format. Alias for --format=posix.
62 <p>
63 <li> -B (default)
64 <br>
65 Use BSD output format. Alias for --format=bsd.
66 <p>
67
68 <li> -help
69 <br>
70 Print a summary of command-line options and their meanings.
71 <p>
72
73 <li> -defined-only
74 <br>
75 Print only symbols defined in this bytecode file (as opposed
76 to symbols which may be referenced by objects in this file,
77 but not defined in this file.)
78 <p>
79
80 <li> -extern-only, -g
81 <br>
82 Print only symbols whose definitions are external; that is,
83 accessible from other bytecode files.
84 <p>
85
86 <li> -undefined-only, -u
87 <br>
88 Print only symbols referenced but not defined in this bytecode
89 file.
90 <p>
91
92 <li> -format=<i>fmt</i>, -f
93 <br>
94 Select an output format; <i>fmt</i> may be sysv, posix, or
95 bsd. The default is bsd.
96 <p>
97</ul>
98
99<h3>BUGS</h3>
100
Brian Gaekef00785f2003-11-18 06:18:09 +0000[diff] [blame]101<tt>llvm-nm</tt> cannot demangle C++ mangled
Brian Gaekebb24b9c2003-10-16 18:03:24 +0000[diff] [blame]102names, like GNU <tt>nm(1)</tt> can.
103
104<h3>EXIT STATUS</h3>
105
106<tt>llvm-nm</tt> exits with an exit code of zero.
107
108<h3>SEE ALSO</h3>
109
110<a href="llvm-dis.html"><tt>llvm-dis</tt></a>,
111<tt>ar(1)</tt>,
112<tt>nm(1)</tt>
113
114<HR>
115Maintained by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>.
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