List the symbols within a wasm file.

• Library
• Executable
• License
• Contributing

To install the wasm-nm executable, run

$ cargo install wasm-nm

For information on using the wasm-nm executable, run

$ wasm-nm --help

wasm-nm can function as a rudimentary size profiler for .wasm files.

The -z option enables printing a function's code size. The unix sort utility can be used to sort the symbols by size. The rustfilt utility can be used to demangle Rust symbols (cargo install rustfilt).

$ wasm-nm -z path/to/something.wasm | sort -n -u -r | rustfilt | head
3578 p dlmalloc::dlmalloc::Dlmalloc::malloc::hb37c2fafc9847520
3307 e quicksilver
1427 p <str as core::fmt::Debug>::fmt::h0cf4ea19d7121472
1287 p std::panicking::rust_panic_with_hook::h52b2005910c55f47
1268 p core::fmt::Formatter::pad::hdb2be9f507201bd1
1248 p core::str::slice_error_fail::h09ffe3974e261c49
1064 p core::fmt::write::h914fcaafc6fb200a
987 p core::fmt::Formatter::pad_integral::h2f2f83d99c318b28
945 p <&'a T as core::fmt::Debug>::fmt::h4a5a01d440d30f67
918 p dlmalloc::dlmalloc::Dlmalloc::free::h8185738df2a87b48

To use wasm-nm as a library, add this to your Cargo.toml:

[dependencies.wasm-nm]
# Do not build the executable.
default-features = false

See docs.rs/wasm-nm for API documentation.

Licensed under either of

• Apache License, Version 2.0

• MIT license

at your option.

See CONTRIBUTING.md for hacking.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

License: Apache-2.0/MIT