bug2045489.js - mozsearch

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// |jit-test| skip-if: !wasmStackSwitchingEnabled()

const bin = wasmTextToBinary(`(module

  (type $ft (func))

  (type $ct (cont $ft))

  (type $s (struct (field (ref null $ct))))

  (func $f)

  (elem declare func $f)

  (func (export "make") (result anyref)

    (struct.new $s (cont.new $ct (ref.func $f)))))`);

const { make } = new WebAssembly.Instance(new WebAssembly.Module(bin)).exports;

// A continuation is not exposable to JS, so reading the field must throw

// rather than leak the live ContObject. The exposability check in

// WasmGcObject::loadValue must run before the (ref $ct) -> eqref erasure,

// otherwise the continuation would escape masked as an eqref.

assertErrorMessage(() => wasmGcReadField(make(), 0), TypeError,

                   /cannot pass value to or from JS/);