By default, Asterius only emits code that uses WebAssembly MVP features. There are flags to make use of WebAssembly experimental features:
--tail-calls: Emits tail call opcodes for Cmm function calls; overrides the default trampoline approach. Only supported by the wasm-toolkit backend at the moment.--debug: Uses i64 BigInt integration for passing i64 values between js/wasm.The above features require specific flags to switch on in V8. They are known to work in latest Node.js 12.x versions, and we test them on CI.
The V8 team maintains a Node.js 13.x build which integrates V8 trunk, described here. It's possible to use that build to evaluate experimental WebAssembly features; we provide a script which unzips the latest test-passing build to the current directory, so it's possible to use the node binary for testing bleeding-edge Wasm features in V8.
We are keeping an eye on the development of experimental WebAssembly features. Here is a list of V8 tracking issues of the features we are interested in. Some are already available in recent Node.js or Chromium releases.
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