[chenyan2002]

When a core module with main function is built with target wasm32-wasip2, the entry export becomes wasi:cli/run@0.2.0#run, instead of _start.

This means we need to synthesize a _start function by calling wasi:cli/run@0.2.0#run, and call wasi:cli/exit if the return is non-zero.

Another "simpler" option is to change the declaration in the adapter with

#[link(wasm_import_module = "__main_module__")]
extern "C" {
    #[link_name = "wasi:cli/run@0.2.0#run"]
    fn run() -> i32;
}

But that means we need yet another adapter binary.

[dgohman-fastly]

Instead of trapping if the error code is nonzero, could it call wasi:cli/exit instead?

[chenyan2002]

Good idea. I also changed the synthesize function to use walrus, because importing "wasi:cli/exit" may change all the function index, and walrus ends up with much shorter code.