wasmi

WASM interpreter (previously lived in parity-wasm)

Primary purpose of wasmi is to be used with parity (ethereum-like contracts in wasm) and with Polkadot. However, wasmi is designed to be as flexible as possible and might be suited well for other purposes.

Build & Test

As wasmi contains a git submodule, you need to use --recursive for cloning or to checkout the submodule explicitly, otherwise the testing would fail.

git clone https://github.com/paritytech/wasmi.git --recursive
cd wasmi
cargo build
cargo test

no_std support

This crate supports no_std environments. Enable the core feature and disable default features:

[dependencies]
parity-wasm = {
	version = "0.31",
	default-features = false,
	features = "core"
}

The core feature requires the core and alloc libraries and a nightly compiler. Also, code related to std::error is disabled.

Floating point operations in no_std use libm, which sometimes panics in debug mode (https://github.com/japaric/libm/issues/4). So make sure to either use release builds or avoid WASM with floating point operations, for example by using deny_floating_point.

License

wasmi is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), at your choice.

See LICENSE-APACHE, and LICENSE-MIT for details.

Contribution

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