Jai WASM Plugin

A prototype of a Metaprogram Plugin for compiling Jai to wasm64 (and maybe wasm32).

How it works?

• The Metaprogram Plugin sets the LLVM target triple to wasm64.
• It then strips all procedure bodies that contain inline assembly (we need to provide non-asm alternatives in the future).
• After, it links the WASM binary with the wasm-ld.
• Optionally, it uses the wasm64232 tool to convert the 64 WASM binary to 32 one (this is currently untested).

How to use

Compilation

• A tiny change in Basic/Print.jai:3 is needed. Change it from USE_SIMD :: true; to USE_SIMD :: CPU == .X64;.
• Include the WASM Metaprogram Plugin in your build.jai.
• Or compile your program with the following command jai main.jai -plug wasm --- import_dir /path/to/wasm/plugin

JavaScript -> Jai

Define foreign JavaScript functions with a foreign directive in the following way:

alert :: (s: string) #foreign WASM;

Jai -> JavaScript

Export Jai procedures with #program_export directive. Optionally you can specify the export name #program_export "export_name".

#program_export
render :: ()  {
    ...
}

When compilation output is set to executable main is automatically exported.

How to compile the Hello World example

• Compile main.jai with the WASM metaprogram plugin with the following command jai main.jai -plug wasm --- import_dir /path/to/wasm/plugin.
• Serve public folder with local HTTP server.

Credits

This approach is based on jai-wasm thanks!