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FR-AI / ANALYSISWhy it is worth attention
It provides a fully client-side Rust compiler toolchain using Cranelift instead of LLVM, with novel translation from Cranelift IR to Waffle IR and a custom Wasm linker, all enabled by compiling rustc to WASM.
Who it is for
- Rust learners seeking instant feedback in the browser
- Web developers interested in in-browser compilation
- Educators teaching computer memory or Rust concepts
- Toolchain enthusiasts exploring alternative Rust backends
Use cases
- Running Rust code snippets interactively without a server
- Completing the Rustlings exercise suite in the browser
- Demonstrating memory visualization during Rust code execution
- Experimenting with Cranelift-based Rust compilation in WebAssembly
Strengths
- Entirely client-side execution removes server dependency
- Novel Cranelift-to-Waffle-to-Wasm pipeline offers a unique approach
- Leverages well-established rustc compiled to WASM for compatibility
- Includes a practical web UI with both a playground and Rustlings
Considerations
- Experimental and may have stability or performance issues
- AI‑generated components (linker, CLIF‑to‑Waffle) may need upstream maintenance
- Limited to Cranelift backend; LLVM‐based compilation is not available
README quick start
Weblings
Weblings is a Rust compiler toolchain compiled to WASM. This means that you can compile and execute Rust code in your browser!
Tech stack tl;dr rust code -> rustc -> cranelift IR -> waffle -> wasm object files -> linker -> wasm executable -> browser execution
The web UI
The primary way to interface with this WASM toolchain is through the web UI, which you can access at https://weblings.forest-anderson.ca. It has two sections:
- Playground: Similar to the Rust Playground, but the code compiles and runs in your browser
- Rustlings: The beloved Rustlings excercise suite, brought to you in your browser!
The stack
A few things had to be set up to get this toolchain working:
- rustc compiled to WASM: @bjorn3 has set up branches that patch rustc so that it can run inside WASM correctly. Very awesome! I build the rustc binaries for WASM in this repo.
- ⭐ Cranelift IR -> waffle translation: a crate to go from Cranelift's intermediate representation (CLIF) to waffle's own intermediate representation, which waffle can then translate to WASM. This solution was inspired by disussion in this issue on bytecodealliance/wasmtime.
- ⭐ A wasm
linker:
a crate to link the compiled WASM object to the bundled std sysroot rlibs.
There are some alternatives, like
wasm-ldfrom LLVM. I was hoping that the Wild linker might have WASM linking support, but that's still on the way.
⭐ - these steps were written with AI tooling to achieve the goals of this project, but I'd love to see them included in Cranelift/Wild, and hope to find a way to upstream them!
Why?
I've set up this toolchain so that I can build out some tooling that I'll be using in upcoming projects to teach computer memory principles. I'v
Description
Compiling Rust to WASM from inside WASM!
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