Unexpected token "null" with WasmGC example

[trolund]

I can see that wat2wasm does have the option to enable "gc", but when running the example below (with all features enabled), it fail. The example is from the article: https://v8.dev/blog/wasm-gc-porting

(module
  (type $Node (struct (field $next (ref null $Node)) (field $value (mut i32))))

  (global $global (mut (ref null $Node)) (ref.null $Node))

  (export "global" (global $global))

  (export "_start" (func $_start))

  (func $_start
    (local $i i32)
    (loop $loop
      (global.set $global
        (struct.new $Node
          (global.get $global)
          (local.get $i)
        )
      )
      (local.set $i
        (i32.add
          (local.get $i)
          (i32.const 1)
        )
      )
    
      (br_if $loop
        (i32.le_u
          (local.get $i)
          (i32.const 1000)
        )
      )
    )

  )
)

The error:

Error: parseWat failed:
test.wast:2:41: error: unexpected token "null", expected a numeric index or a name (e.g. 12 or $foo).
  (type $Node (struct (field $next (ref null $Node)) (field $value (mut i32))))

Is there any roadmap for the GC spec in wat2wasm?

[keithw]

We don't currently support the function-references or gc proposals (we don't even have them on the matrix at https://github.com/WebAssembly/wabt/), but given their imminent merger into the spec, I would really like to. I don't think we have anybody signed up for this at the moment though.

[kevmoo]

I see that gc is an option now, but this is still failing out.

Trying w/ this wasm file (using GC) https://kevmoo.com/main.wasm

wasm2wat --enable-all main.wasm
000000f: error: expected valid field type (got -0x8)

[keithw]

WABT does not support the GC proposal. We don't even have them on the matrix at https://github.com/WebAssembly/wabt/ . The wasm-tools suite does support them though.