https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly
http://webassembly.org/docs/future-features/
https://github.com/kripken/emscripten/wiki/WebAssembly#building-to-webassembly
https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
http://webassembly.org/docs/binary-encoding/
https://en.wikipedia.org/wiki/LEB128
https://github.com/WebAssembly/spec