Platform Support

The wasmtime project is a configurable and lightweight runtime for WebAssembly which has a number of ways it can be configured. Not all features are supported on all platforms, but it is intended that wasmtime can run in some capacity on almost all platforms! The matrix of what's being tested, what works, and what's supported where is evolving over time, and this document hopes to capture a snapshot of what the current state of the world looks like.

All features of wasmtime should work on the following platforms:

  • Linux x86_64
  • macOS x86_64
  • Windows x86_64

For more detailed information about supported platforms, please check out the sections below!

JIT compiler support

The JIT compiler, backed by either lightbeam or cranelift supports only the x86_64 architecture at this time. Support for at least ARM, AArch64, and x86 is planned at this time.

Usage of the JIT compiler will require a host operating system which supports creating executable memory pages on-the-fly. In Rust terms this generally means that std needs to be supported on this platform.

Interpreter support

At this time wasmtime does not have a mode in which it simply interprets WebAssembly code. It is planned to add support for an interpreter, however, and this will have minimal system dependencies. It is planned that the system will need to support some form of dynamic memory allocation, but other than that not much else will be needed.

What about #[no_std]?

The wasmtime project does not currently use #[no_std] for its crates, but this is not because it won't support it! At this time we're still gathering use cases for for what #[no_std] might entail, so if you're interested in this we'd love to hear about your use case! Feel free to open an issue on the wasmtime repository to discuss this.