Commits on Mar 20, 2024

1. builder, src/runtime, targets, tests/wasm: prototype WebAssembly reac… …

   …tor mode
   
   The entrypoint for a WebAssembly reactor module is _initialize instead of _start.
   
   Assuming that the WebAssembly runtime is not reentrant (e.g. not threaded), then
   this works if the //go:wasmexport calls are detected and wrapped in a function
   that starts the Go scheduler.
   
   When the exported function ends, all other goroutines are paused.
   
   Goroutines started in a global init() function will run while the host has called into
   the guest. They are paused when the guest call returns and restarted on the next call.
   
   TODO: figure out how to enable reactor mode:
   1. Should it be a flag to tinygo build?
   2. Should it be a build tag (e.g. -tags reactor)?
   3. Should the compiler detect the omission of main.main and automatically enable reactor mode?
   
   TODO: figure out where best to wrap //go:wasmexport calls.
   
   WIP

   

   ydnar committed Mar 20, 2024
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