Function main

examples/fuel.cc:37–63

const size_t kStoreFuel = 10000;

int main() {
  Config config;
  config.consume_fuel(true);
  Engine engine(std::move(config));
  Store store(engine);
  store.context().set_fuel(kStoreFuel).unwrap();

  auto wat = readFile("examples/fuel.wat");
  Module module = Module::compile(engine, wat).unwrap();
  Instance instance = Instance::create(store, module, {}).unwrap();
  Func fib = std::get<Func>(*instance.get(store, "fibonacci"));

  // Call it repeatedly until it fails
  for (int32_t n = 1;; n++) {
    auto result = fib.call(store, {n});
    if (!result) {
      std::cout << "Exhausted fuel computing fib(" << n << ")\n";
      break;
    }
    uint64_t consumed = kStoreFuel - store.context().get_fuel().unwrap();
    auto fib_result = std::move(result).unwrap()[0].i32();

    std::cout << "fib(" << n << ") = " << fib_result << " [consumed "
              << consumed << " fuel]\n";
    store.context().set_fuel(kStoreFuel).unwrap();
  }
}