warpy - WebAssembly in RPython

A WebAssembly interpreter written in RPython.

Warpy supports the WebAssembly MVP (minimum viable product) version of the spec.

Prerequisites

Build whe warpy executable. You will need a build of rpython on the path:

make warpy-jit   # or make warpy-nojit

Alternatively, you can use an rypthon docker container (built from Dockerfile-rpython) and do the compilation from there:

docker pull kanaka/warpy-rpython
docker run -it kanaka/warpy-rpython -v `pwd`:/build -w /build make warpy-jit

You will need wast2wasm to compile wast source to wasm bytecode. Check-out and build wabt (wabbit):

git clone --recursive https://github.com/WebAssembly/wabt
make -C wabt gcc-release

Usage

Compile a wasm module:

wast2wasm test/addTwo.wast -o test/addTwo.wasm

Load and call a function in a wasm module:

./warpy-jit test/addTwo.wasm addTwo 11 12

You can also use standard python (but it's much slower of course):

python warpy.py test/addTwo.wasm addTwo 13 14

There is also a REPL mode that allow you to interactively invoke functions within a module:

./warpy-jit --repl test/addTwo.wasm
webassembly> addTwo 2 3

Misc

Some rough notes for running the WebAssembly specification tests can be found in notes\_testing.

License

MPL-2.0 (see LICENSE)