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GNU nm implementation

List symbols from object files

Description

GNU nm lists the symbols from object files objfile....
If no object files are listed as arguments, nm assumes the file a.out.
For each symbol, nm shows:

  • The symbol value, in the radix selected by options, or hexadecimal by default.
  • The symbol type. If lowercase, the symbol is local; if uppercase, the symbol is global (external).
  • The symbol name.

Supported format

Architecture

  • 64-bit
  • 32-bit
  • Little endian
  • Big endian

File

  • Linux executables
  • Object files (.o)
  • Shared objects (.so)

Options

Implemented options:

  • -g | Display only external symbols.
  • -p | Do not bother to sort the symbols in any order; print them in the order encountered.
  • -u | Display only undefined symbols (those external to each object file).
  • -r | Reverse the order of the sort (whether numeric or alphabetic); let the last come first.

Make

Given Makefile contains all standard rules

  • all
  • clean
  • fclean
  • re

Example output

$ make
 ~ | Compiled libft
 ~ | Compiled ft_nm
$ ./ft_nm tests/good/a.out 
0000000000601028 B __bss_start
0000000000601028 b completed.7698
0000000000601018 D __data_start
0000000000601018 W data_start
00000000004003f0 t deregister_tm_clones
00000000004003e0 T _dl_relocate_static_pie
0000000000400460 t __do_global_dtors_aux
0000000000600e58 d __do_global_dtors_aux_fini_array_entry
0000000000601020 D __dso_handle
0000000000600e60 d _DYNAMIC
0000000000601028 D _edata
0000000000601030 B _end
0000000000400524 T _fini
0000000000400490 t frame_dummy
0000000000600e50 d __frame_dummy_init_array_entry
000000000040063c r __FRAME_END__
0000000000601000 d _GLOBAL_OFFSET_TABLE_
                 w __gmon_start__
0000000000400534 r __GNU_EH_FRAME_HDR
0000000000400390 T _init
0000000000600e58 d __init_array_end
0000000000600e50 d __init_array_start
0000000000400530 R _IO_stdin_used
0000000000400520 T __libc_csu_fini
00000000004004b0 T __libc_csu_init
                 U __libc_start_main@@GLIBC_2.2.5
00000000004004a0 T main
0000000000400420 t register_tm_clones
00000000004003b0 T _start
0000000000601028 D __TMC_END__