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wasmi- WebAssembly (Wasm) Interpreter

wasmi was conceived as a component of parity-ethereum (ethereum-like contracts in wasm) and substrate. These projects are related to blockchain and require a high degree of correctness. The project is not trying to be be involved in any implementation of any of work-in-progress Wasm proposals. Instead the project tries to be as close as possible to the specification, therefore avoiding features that are not directly supported by the specification.

With all that said wasmi should be a good option for initial prototyping and there shouldn't be a problem migrating from wasmi to another specification compliant execution engine later on.

Developer Notes

Building

Clone wasmi from our official repository and then build using the standard cargo procedure:

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

Testing

In order to test wasmi you need to initialize and update the Git submodules using:

git submodule update --init --recursive

Alternatively you can provide --recursive flag to git clone command while cloning the repository:

git clone https://github.com/paritytech/wasmi.git ---recursive

After Git submodules have been initialized and updated you can test using:

cargo test

It is recommended to further specify --release since compiling and testing without optimizations usually is slower compared to compiling and testing with optimizations.

Platforms

Supported platforms are primarily Linux, MacOS, Windows and WebAssembly.

Use the following command in order to produce a WebAssembly build:

cargo build --no-default-features --target wasm32-unknown-unknown

Features

On 64-bit platforms we further provide cross-platform suppport for virtual memory usage. For this build wasmi using:

cargo build --features virtual_memory

Benchmarks

In order to benchmark wasmi use the following command:

cargo bench --manifest-path benches/Cargo.toml

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.