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b2438b1473
This unlocks some codepaths in libtool. Differential Revision: https://reviews.llvm.org/D102321
294 lines
6.2 KiB
ReStructuredText
294 lines
6.2 KiB
ReStructuredText
llvm-nm - list LLVM bitcode and object file's symbol table
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==========================================================
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.. program:: llvm-nm
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SYNOPSIS
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--------
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:program:`llvm-nm` [*options*] [*filenames...*]
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DESCRIPTION
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-----------
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The :program:`llvm-nm` utility lists the names of symbols from LLVM bitcode
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files, object files, and archives. Each symbol is listed along with some simple
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information about its provenance. If no filename is specified, *a.out* is used
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as the input. If *-* is used as a filename, :program:`llvm-nm` will read a file
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from its standard input stream.
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:program:`llvm-nm`'s default output format is the traditional BSD :program:`nm`
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output format. Each such output record consists of an (optional) 8-digit
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hexadecimal address, followed by a type code character, followed by a name, for
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each symbol. One record is printed per line; fields are separated by spaces.
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When the address is omitted, it is replaced by 8 spaces.
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The supported type code characters are as follows. Where both lower and
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upper-case characters are listed for the same meaning, a lower-case character
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represents a local symbol, whilst an upper-case character represents a global
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(external) symbol:
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a, A
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Absolute symbol.
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b, B
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Uninitialized data (bss) object.
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C
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Common symbol. Multiple definitions link together into one definition.
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d, D
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Writable data object.
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i, I
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COFF: .idata symbol or symbol in a section with IMAGE_SCN_LNK_INFO set.
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n
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ELF: local symbol from non-alloc section.
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COFF: debug symbol.
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N
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ELF: debug section symbol, or global symbol from non-alloc section.
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s, S
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COFF: section symbol.
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Mach-O: absolute symbol or symbol from a section other than __TEXT_EXEC __text,
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__TEXT __text, __DATA __data, or __DATA __bss.
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r, R
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Read-only data object.
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t, T
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Code (text) object.
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u
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ELF: GNU unique symbol.
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U
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Named object is undefined in this file.
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v
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ELF: Undefined weak object. It is not a link failure if the object is not
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defined.
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V
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ELF: Defined weak object symbol. This definition will only be used if no
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regular definitions exist in a link. If multiple weak definitions and no
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regular definitions exist, one of the weak definitions will be used.
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w
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Undefined weak symbol other than an ELF object symbol. It is not a link failure
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if the symbol is not defined.
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W
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Defined weak symbol other than an ELF object symbol. This definition will only
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be used if no regular definitions exist in a link. If multiple weak definitions
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and no regular definitions exist, one of the weak definitions will be used.
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\-
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Mach-O: N_STAB symbol.
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?
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Something unrecognizable.
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Because LLVM bitcode files typically contain objects that are not considered to
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have addresses until they are linked into an executable image or dynamically
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compiled "just-in-time", :program:`llvm-nm` does not print an address for any
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symbol in an LLVM bitcode file, even symbols which are defined in the bitcode
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file.
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OPTIONS
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-------
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.. program:: llvm-nm
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.. option:: -B
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Use BSD output format. Alias for ``--format=bsd``.
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.. option:: --debug-syms, -a
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Show all symbols, even those usually suppressed.
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.. option:: --defined-only, -U
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Print only symbols defined in this file.
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.. option:: --demangle, -C
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Demangle symbol names.
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.. option:: --dynamic, -D
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Display dynamic symbols instead of normal symbols.
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.. option:: --extern-only, -g
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Print only symbols whose definitions are external; that is, accessible from
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other files.
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.. option:: --format=<format>, -f
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Select an output format; *format* may be *sysv*, *posix*, *darwin*, *bsd* or
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*just-symbols*.
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The default is *bsd*.
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.. option:: --help, -h
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Print a summary of command-line options and their meanings.
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.. option:: --help-list
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Print an uncategorized summary of command-line options and their meanings.
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.. option:: --just-symbol-name, -j
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Print just the symbol names. Alias for `--format=just-symbols``.
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.. option:: -m
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Use Darwin format. Alias for ``--format=darwin``.
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.. option:: --no-demangle
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Don't demangle symbol names. This is the default.
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.. option:: --no-llvm-bc
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Disable the LLVM bitcode reader.
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.. option:: --no-sort, -p
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Show symbols in the order encountered.
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.. option:: --no-weak, -W
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Don't print weak symbols.
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.. option:: --numeric-sort, -n, -v
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Sort symbols by address.
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.. option:: --portability, -P
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Use POSIX.2 output format. Alias for ``--format=posix``.
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.. option:: --print-armap, -M
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Print the archive symbol table, in addition to the symbols.
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.. option:: --print-file-name, -A, -o
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Precede each symbol with the file it came from.
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.. option:: --print-size, -S
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Show symbol size as well as address (not applicable for Mach-O).
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.. option:: --quiet
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Suppress 'no symbols' diagnostic.
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.. option:: --radix=<RADIX>, -t
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Specify the radix of the symbol address(es). Values accepted are *d* (decimal),
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*x* (hexadecimal) and *o* (octal).
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.. option:: --reverse-sort, -r
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Sort symbols in reverse order.
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.. option:: --size-sort
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Sort symbols by size.
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.. option:: --special-syms
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Do not filter special symbols from the output.
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.. option:: --undefined-only, -u
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Print only undefined symbols.
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.. option:: --version, -V
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Display the version of the :program:`llvm-nm` executable, then exit. Does not
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stack with other commands.
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.. option:: --without-aliases
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Exclude aliases from the output.
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.. option:: @<FILE>
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Read command-line options from response file `<FILE>`.
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MACH-O SPECIFIC OPTIONS
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-----------------------
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.. option:: --add-dyldinfo
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Add symbols from the dyldinfo, if they are not already in the symbol table.
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This is the default.
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.. option:: --add-inlinedinfo
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Add symbols from the inlined libraries, TBD file inputs only.
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.. option:: --arch=<arch1[,arch2,...]>
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Dump the symbols from the specified architecture(s).
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.. option:: --dyldinfo-only
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Dump only symbols from the dyldinfo.
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.. option:: --no-dyldinfo
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Do not add any symbols from the dyldinfo.
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.. option:: -s=<segment section>
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Dump only symbols from this segment and section name.
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.. option:: -x
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Print symbol entry in hex.
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BUGS
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----
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* :program:`llvm-nm` does not support the full set of arguments that GNU
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:program:`nm` does.
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EXIT STATUS
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-----------
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:program:`llvm-nm` exits with an exit code of zero.
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SEE ALSO
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--------
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:manpage:`llvm-ar(1)`, :manpage:`llvm-objdump(1)`, :manpage:`llvm-readelf(1)`,
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:manpage:`llvm-readobj(1)`
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