Function WrapFunc

func.go:164–183

WrapFunc wraps a native Go function, `f`, as a wasm `Func`. This function differs from `NewFunc` in that it will determine the type signature of the wasm function given the input value `f`. The `f` value provided must be a Go function. It may take any number of the following types as arguments: `i

(
	store Storelike,
	f interface{},
)

//
// If the function `f` panics then the panic will be propagated to the caller.
func WrapFunc(
	store Storelike,
	f interface{},
) *Func {
	val := reflect.ValueOf(f)
	wasmTy := inferFuncType(val)
	idx := insertFuncWrap(getDataInStore(store), val)

	ret := C.wasmtime_func_t{}
	C.go_func_new(
		store.Context(),
		wasmTy.ptr(),
		C.size_t(idx),
		1, // this is `WrapFunc`, not `NewFunc`
		&ret,
	)
	runtime.KeepAlive(store)
	runtime.KeepAlive(wasmTy)
	return mkFunc(ret)
}

func inferFuncType(val reflect.Value) *FuncType {
	// Make sure the `interface{}` passed in was indeed a function