llvm-nm - list LLVM bitcode and object file’s symbol table — LLVM 8 documentation

# llvm-nm - list LLVM bitcode and object file’s symbol table

## SYNOPSIS

llvm-nm [options] [filenames…]

## DESCRIPTION

The llvm-nm utility lists the names of symbols from the LLVM bitcode files, object files, or ar archives containing them, named on the command line. Each symbol is listed along with some simple information about its provenance. If no file name is specified, or - is used as a file name, llvm-nm will process a file on its standard input stream.

llvm-nm’s default output format is the traditional BSD nm 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.

Type code characters currently supported, and their meanings, are as follows:

U

> Named object is referenced but undefined in this bitcode file

C

> Common (multiple definitions link together into one def)

W

> Weak reference (multiple definitions link together into zero or one definitions)

t

> Local function (text) object

T

> Global function (text) object

d

> Local data object

D

> Global data object

?

> Something unrecognizable

Because LLVM bitcode 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”, llvm-nm does not print an address for any symbol in an LLVM bitcode file, even symbols which are defined in the bitcode file.

## OPTIONS

`-B``(default)`

  Use BSD output format. Alias for –format=bsd.

`-P```

  Use POSIX.2 output format. Alias for –format=posix.

`--debug-syms````,` `-a```

  Show all symbols, even debugger only.

`--defined-only```

  Print only symbols defined in this file (as opposed to symbols which may be referenced by objects in this file, but not defined in this file.)

`--dynamic````,` `-D```

  Display dynamic symbols instead of normal symbols.

`--extern-only````,` `-g```

  Print only symbols whose definitions are external; that is, accessible from other files.

`--no-weak````,` `-W```

  Don’t print any weak symbols in the output.

`--format``=format``,` `-f` `format`

  Select an output format; format may be sysv, posix, or bsd. The default is bsd.

`-help```

  Print a summary of command-line options and their meanings.

`--no-sort````,` `-p```

  Shows symbols in order encountered.

`--numeric-sort````,` `-n````,` `-v```

  Sort symbols by address.

`--print-file-name````,` `-A````,` `-o```

  Precede each symbol with the file it came from.

`--print-size````,` `-S```

  Show symbol size instead of address.

`--size-sort```

  Sort symbols by size.

`--undefined-only````,` `-u```

  Print only symbols referenced but not defined in this file.

`--radix``=RADIX``,` `-t```

  Specify the radix of the symbol address(es). Values accepted d(decimal), x(hexadecomal) and o(octal).

## BUGS

> - llvm-nm does not support the full set of arguments that GNU nm does.

## EXIT STATUS

llvm-nm exits with an exit code of zero.

## SEE ALSO

llvm-dis, ar(1), nm(1)