llvm-nm (1) - Linux Manuals

llvm-nm: list LLVM bitcode file's symbol table

NAME

llvm-nm - list LLVM bitcode file's symbol table

SYNOPSIS

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

DESCRIPTION

The llvm-nm utility lists the names of symbols from the LLVM bitcode files, or ar archives containing LLVM bitcode files, 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 bitcode 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, even symbols which are defined in the bitcode file.

OPTIONS

-P

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

-B (default)

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

-help

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

--defined-only

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

--extern-only, -g

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

--undefined-only, -u

Print only symbols referenced but not defined in this bitcode file.

--format=fmt, -f

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

BUGS

llvm-nm cannot demangle C++ mangled names, like GNU nm can.

EXIT STATUS

llvm-nm exits with an exit code of zero.

AUTHOR

Maintained by the LLVM Team (<http://llvm.org>).