Function callback

examples/multi.c:27–42

A function to be called from Wasm code.

// A function to be called from Wasm code.
wasm_trap_t *callback(void *env, wasmtime_caller_t *caller,
                      const wasmtime_val_t *args, size_t nargs,
                      wasmtime_val_t *results, size_t nresults) {
  (void)env;
  (void)caller;
  (void)nargs;
  (void)nresults;

  printf("Calling back...\n");
  printf("> %" PRIu32 " %" PRIu64 "\n", args[0].of.i32, args[1].of.i64);
  printf("\n");

  results[0] = args[1];
  results[1] = args[0];
  return NULL;
}

// A function closure.
wasm_trap_t *closure_callback(void *env, wasmtime_caller_t *caller,