llvm/docs/CommandGuide/llvm-size.md

# llvm-size - print size information

:::{program} llvm-size
:::

## SYNOPSIS

{program}`llvm-size` \[*options*\] \[*input...*\]

## DESCRIPTION

{program}`llvm-size` is a tool that prints size information for binary files.
It is intended to be a drop-in replacement for GNU's {program}`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, {program}`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

:::{option} -A
Equivalent to {option}`--format` with a value of `sysv`.
:::

:::{option} --arch=<arch>
Architecture(s) from Mach-O universal binaries to display information for.
:::

:::{option} -B
Equivalent to {option}`--format` with a value of `berkeley`.
:::

:::{option} --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.
:::

:::{option} --exclude-pagezero
Do not include the `__PAGEZERO` segment when calculating size information
for Mach-O files. The `__PAGEZERO` segment is a virtual memory region used
for memory protection that does not contribute to actual size, and excluding
can provide a better representation of actual size.
:::

:::{option} -d
Equivalent to {option}`--radix` with a value of `10`.
:::

:::{option} -l
Display verbose address and offset information for segments and sections in
Mach-O files in `darwin` format.
:::

:::{option} --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:

```console
$ 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:

```console
$ 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:

```console
$ 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, {program}`llvm-size` falls back to `berkeley`
format. When producing `darwin` format, the tool displays information about
segments and sections:

```console
$ 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
```
:::

:::{option} --help, -h
Display a summary of command line options.
:::

:::{option} -m
Equivalent to {option}`--format` with a value of `darwin`.
:::

:::{option} -o
Equivalent to {option}`--radix` with a value of `8`.
:::

:::{option} --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:

```console
$ 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
```
:::

:::{option} --totals, -t
Applies only to `berkeley` output format. Display the totals for all listed
fields, in addition to the individual file listings.

Example:

```console
$ 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)
```
:::

:::{option} --version
Display the version of the {program}`llvm-size` executable.
:::

:::{option} -x
Equivalent to {option}`--radix` with a value of `16`.
:::

:::{option} @<FILE>
Read command-line options from response file `<FILE>`.
:::

## EXIT STATUS

{program}`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/>>.