Apple's atos is handy, but not always available or convenient in cross-platform workflows.
atosl provides a lightweight alternative for address-to-symbol resolution with a simple CLI.

• Resolve one or more addresses to symbols
• Use Mach-O symbol table and DWARF debug info
• Support file-offset mode (-f)
• Select architecture/UUID for fat Mach-O binaries
• Verbose mode for debugging symbolication failures
• Works with Rust-supported platforms (tooling/build environment dependent)

cargo install atosl

git clone https://github.com/everettjf/atosl-rs.git
cd atosl-rs
cargo build --release

Binary path:

./target/release/atosl

atosl -o MyApp.app/MyApp -l 0x100000000 0x100001234

Output shape:

<symbol> (in <binary>) (<file>:<line>)

atosl [OPTIONS] -o <OBJECT_PATH> -l <LOAD_ADDRESS> [ADDRESSES]...

Required arguments:

• -o <OBJECT_PATH>: binary or symbol file path
• -l <LOAD_ADDRESS>: load address (0x... hex or decimal)
• [ADDRESSES]...: one or more addresses to symbolize

Options:

• -f: treat addresses as file offsets
• -v: verbose diagnostics
• -a, --arch <ARCH>: choose architecture in fat Mach-O (arm64, arm64e, armv7, x86_64, i386, ...)
• --uuid <UUID>: choose Mach-O slice by UUID (with or without hyphens)

Resolve multiple addresses:

atosl -o MyApp.app/MyApp -l 0x100000000 0x100001234 0x100005678

Use file-offset mode:

atosl -f -o MyApp.app/MyApp -l 0x0 0x1234

Select a fat Mach-O slice by architecture:

atosl -o Flutter -l 0x100000000 -a arm64 0x100001234

Select a fat Mach-O slice by UUID:

atosl -o Flutter -l 0x100000000 --uuid 34FBD46D-4A1F-3B41-A0F1-4E57D7E25B04 0x100001234

• N/A - no symbols: binary may be stripped or missing debug sections
• Unexpected source location: verify the load address is correct for the running image
• Wrong symbol on fat binaries: specify --arch or --uuid explicitly

cargo check
cargo build
cargo build --release
cargo fmt
cargo clippy -- -D warnings

• Not a full 1:1 clone of Apple's atos
• Final accuracy depends on symbol and DWARF quality in the input binary

Issues and pull requests are welcome.

MIT. See LICENSE.