1LLVM-NM(1)                           LLVM                           LLVM-NM(1)
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NAME

6       llvm-nm - list LLVM bitcode and object file's symbol table
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SYNOPSIS

9       llvm-nm [options] [filenames...]
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DESCRIPTION

12       The llvm-nm utility lists the names of symbols from LLVM bitcode files,
13       object files, and archives. Each symbol is listed along with some  sim‐
14       ple  information  about  its  provenance.  If no filename is specified,
15       a.out is used as the input. If - is used as a  filename,  llvm-nm  will
16       read a file from its standard input stream.
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18       llvm-nm's  default  output format is the traditional BSD nm output for‐
19       mat. Each such output record consists of an (optional) 8-digit hexadec‐
20       imal  address,  followed  by a type code character, followed by a name,
21       for each symbol. One record is printed per line; fields  are  separated
22       by spaces.  When the address is omitted, it is replaced by 8 spaces.
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24       The supported type code characters are as follows. Where both lower and
25       upper-case characters are listed for the  same  meaning,  a  lower-case
26       character  represents  a  local  symbol, whilst an upper-case character
27       represents a global (external) symbol:
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29       a, A
30          Absolute symbol.
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32       b, B
33          Unitialized data (bss) object.
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35       C
36          Common symbol. Multiple definitions link together into  one  defini‐
37          tion.
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39       d, D
40          Writable data object.
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42       i, I
43          COFF:  .idata  symbol or symbol in a section with IMAGE_SCN_LNK_INFO
44          set.
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46       n
47          ELF: local symbol from non-alloc section.
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49          COFF: debug symbol.
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51       N
52          ELF: debug section symbol, or global symbol from non-alloc section.
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54       s, S
55          COFF: section symbol.
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57          Mach-O:  absolute  symbol  or  symbol  from  a  section  other  than
58          __TEXT_EXEC __text, __TEXT __text, __DATA __data, or __DATA __bss.
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60       r, R
61          Read-only data object.
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63       t, T
64          Code (text) object.
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66       u
67          ELF: GNU unique symbol.
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69       U
70          Named object is undefined in this file.
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72       v
73          ELF:  Undefined  weak object. It is not a link failure if the object
74          is not defined.
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76       V
77          ELF: Defined weak object symbol. This definition will only  be  used
78          if  no regular definitions exist in a link. If multiple weak defini‐
79          tions and no regular definitons exist, one of the  weak  definitions
80          will be used.
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82       w
83          Undefined  weak  symbol other than an ELF object symbol. It is not a
84          link failure if the symbol is not defined.
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86       W
87          Defined weak symbol other than an ELF object symbol. This definition
88          will only be used if no regular definitions exist in a link. If mul‐
89          tiple weak definitions and no regular definitons exist, one  of  the
90          weak definitions will be used.
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92       -
93          Mach-O: N_STAB symbol.
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95       ?
96          Something unrecognizable.
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98       Because  LLVM bitcode files typically contain objects that are not con‐
99       sidered to have addresses until they  are  linked  into  an  executable
100       image or dynamically compiled "just-in-time", llvm-nm does not print an
101       address for any symbol in an LLVM bitcode file, even symbols which  are
102       defined in the bitcode file.
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OPTIONS

105       -B     Use BSD output format. Alias for --format=bsd.
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107       --debug-syms, -a
108              Show all symbols, even those usually suppressed.
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110       --defined-only, -U
111              Print only symbols defined in this file.
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113       --demangle, -C
114              Demangle symbol names.
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116       --dynamic, -D
117              Display dynamic symbols instead of normal symbols.
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119       --extern-only, -g
120              Print  only  symbols  whose  definitions  are external; that is,
121              accessible from other files.
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123       --format=<format>, -f
124              Select an output format; format may be sysv, posix,  darwin,  or
125              bsd.  The default is bsd.
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127       --help, -h
128              Print a summary of command-line options and their meanings.
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130       --help-list
131              Print an uncategorized summary of command-line options and their
132              meanings.
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134       --just-symbol-name, -j
135              Print just the symbol names.
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137       -m     Use Darwin format. Alias for --format=darwin.
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139       --no-demangle
140              Don't demangle symbol names. This is the default.
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142       --no-llvm-bc
143              Disable the LLVM bitcode reader.
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145       --no-sort, -p
146              Show symbols in the order encountered.
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148       --no-weak, -W
149              Don't print weak symbols.
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151       --numeric-sort, -n, -v
152              Sort symbols by address.
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154       --portability, -P
155              Use POSIX.2 output format.  Alias for --format=posix.
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157       --print-armap, -M
158              Print the archive symbol table, in addition to the symbols.
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160       --print-file-name, -A, -o
161              Precede each symbol with the file it came from.
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163       --print-size, -S
164              Show symbol size as well as address (not applicable for Mach-O).
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166       --radix=<RADIX>, -t
167              Specify the radix of the symbol address(es). Values accepted are
168              d (decimal), x (hexadecimal) and o (octal).
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170       --reverse-sort, -r
171              Sort symbols in reverse order.
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173       --size-sort
174              Sort symbols by size.
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176       --special-syms
177              Ignored. For GNU compatibility only.
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179       --undefined-only, -u
180              Print only undefined symbols.
181
182       --version
183              Display  the  version of this program. Does not stack with other
184              commands.
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186       --without-aliases
187              Exclude aliases from the output.
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189       @<FILE>
190              Read command-line options from response file <FILE>.
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MACH-O SPECIFIC OPTIONS

193       --add-dyldinfo
194              Add symbols from the dyldinfo, if they are not  already  in  the
195              symbol table.  This is the default.
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197       --arch=<arch1[,arch2,...]>
198              Dump the symbols from the specified architecture(s).
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200       --dyldinfo-only
201              Dump only symbols from the dyldinfo.
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203       --no-dyldinfo
204              Do not add any symbols from the dyldinfo.
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206       -s=<segment section>
207              Dump only symbols from this segment and section name.
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209       -x     Print symbol entry in hex.
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BUGS

212          · llvm-nm  does  not  support  the full set of arguments that GNU nm
213            does.
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EXIT STATUS

216       llvm-nm exits with an exit code of zero.
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SEE ALSO

219       llvm-ar(1), llvm-objdump(1), llvm-readelf(1), llvm-readobj(1)
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AUTHOR

222       Maintained by the LLVM Team (https://llvm.org/).
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225       2003-2019, LLVM Project
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2309                                 2019-09-19                        LLVM-NM(1)
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