llvm-size - print size information — LLVM 21.1.2 documentation

# llvm-size - print size information

## SYNOPSIS

llvm-size [options] [input…]

## DESCRIPTION

llvm-size is a tool that prints size information for binary files. It is intended to be a drop-in replacement for GNU’s size.

The tool prints size information for each `input` specified. If no input is specified, the program prints size information for `a.out`. If “`-`” is specified as an input file, llvm-size reads a file from the standard input stream. If an input is an archive, size information will be displayed for all its members.

## OPTIONS

-A

  Equivalent to `--format` with a value of `sysv`.

--arch=<arch>

  Architecture(s) from Mach-O universal binaries to display information for.

-B

  Equivalent to `--format` with a value of `berkeley`.

--common

  Include ELF common symbol sizes in bss size for `berkeley` output format, or as a separate section entry for `sysv` output. If not specified, these symbols are ignored.

-d

  Equivalent to `--radix` with a value of `10`.

-l

  Display verbose address and offset information for segments and sections in Mach-O files in `darwin` format.

--format=<format>

  Set the output format to the `<format>` specified. Available `<format>` options are `berkeley` (the default), `sysv` and `darwin`.

  Berkeley output summarises text, data and bss sizes in each file, as shown below for a typical pair of ELF files:

      $ llvm-size --format=berkeley test.o test2.o
         text    data     bss     dec     hex filename
          182      16       5     203      cb test.elf
           82       8       1      91      5b test2.o

  For Mach-O files, the output format is slightly different:

      $ llvm-size --format=berkeley macho.obj macho2.obj
      __TEXT  __DATA  __OBJC  others  dec     hex
      4       8       0       0       12      c       macho.obj
      16      32      0       0       48      30      macho2.obj

  Sysv output displays size and address information for most sections, with each file being listed separately:

      $ llvm-size --format=sysv test.elf test2.o
         test.elf  :
         section       size      addr
         .eh_frame       92   2097496
         .text           90   2101248
         .data           16   2105344
         .bss             5   2105360
         .comment       209         0
         Total          412

         test2.o  :
         section             size   addr
         .text                 26      0
         .data                  8      0
         .bss                   1      0
         .comment             106      0
         .note.GNU-stack        0      0
         .eh_frame             56      0
         .llvm_addrsig          2      0
         Total                199

  `darwin` format only affects Mach-O input files. If an input of a different file format is specified, llvm-size falls back to `berkeley` format. When producing `darwin` format, the tool displays information about segments and sections:

      $ llvm-size --format=darwin macho.obj macho2.obj
         macho.obj:
         Segment : 12
                 Section (__TEXT, __text): 4
                 Section (__DATA, __data): 8
                 total 12
         total 12
         macho2.obj:
         Segment : 48
                 Section (__TEXT, __text): 16
                 Section (__DATA, __data): 32
                 total 48
         total 48

--help, -h

  Display a summary of command line options.

-m

  Equivalent to `--format` with a value of `darwin`.

-o

  Equivalent to `--radix` with a value of `8`.

--radix=<value>

  Display size information in the specified radix. Permitted values are `8`, `10` (the default) and `16` for octal, decimal and hexadecimal output respectively.

  Example:

      $ llvm-size --radix=8 test.o
         text    data     bss     oct     hex filename
         0152      04      04     162      72 test.o

      $ llvm-size --radix=10 test.o
         text    data     bss     dec     hex filename
          106       4       4     114      72 test.o

      $ llvm-size --radix=16 test.o
         text    data     bss     dec     hex filename
         0x6a     0x4     0x4     114      72 test.o

--totals, -t

  Applies only to `berkeley` output format. Display the totals for all listed fields, in addition to the individual file listings.

  Example:

      $ llvm-size --totals test.elf test2.o
         text    data     bss     dec     hex filename
          182      16       5     203      cb test.elf
           82       8       1      91      5b test2.o
          264      24       6     294     126 (TOTALS)

--version

  Display the version of the llvm-size executable.

-x

  Equivalent to `--radix` with a value of `16`.

@<FILE>

  Read command-line options from response file `<FILE>`.

## EXIT STATUS

llvm-size exits with a non-zero exit code if there is an error. Otherwise, it exits with code 0.

## BUGS

To report bugs, please visit <https://github.com/llvm/llvm-project/labels/tools:llvm-size/>.