Building and Running SpiderMonkey with WASI

1. Bootstrap the System

Run the following commands to set up the required dependencies:

# Download and run Mozilla's bootstrap script
curl -O https://hg.mozilla.org/mozilla-central/raw-file/default/python/mozboot/bin/bootstrap.py
python3 bootstrap.py --vcs=git

# Add the WebAssembly target for Rust
rustup target add wasm32-wasi

# Install Wasmtime (WebAssembly runtime)
curl https://wasmtime.dev/install.sh -sSf | bash

After running these commands, you can delete the mozilla-unified directory if it was created during bootstrapping.

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2. Compile SpiderMonkey for WASI

./js/src/devtools/automation/autospider.py wasi

This script will automatically configure and build SpiderMonkey for the WASI target.

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3. Run SpiderMonkey with Wasmtime

wasmtime obj-spider/js.wasm

This executes the compiled WebAssembly SpiderMonkey binary using Wasmtime.