LanguageFeatures/FinalizationRegistry/ffi/Finalizer/attach_A06_t02.dart

// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion The finalizer can be attached multiple times to the same object
/// with different, or the same, finalization token.
///
/// @description Checks that finalizer can be attached to the same object with
/// the different finalization tokens.
/// @author iarkh@unipro.ru

import '../../gc_utils_lib.dart';
import '../../../../Utils/expect.dart';

class Nonce {
  final int value;
  Nonce(this.value);
}

final finalizerTokens = <Nonce>{};
int cnt = 0;

final Finalizer finalizer = Finalizer((token) {
  cnt++;
  finalizerTokens.add(token);
});

@pragma('vm:never-inline')
void test(Nonce token) {
  Object value = Object();
  finalizer.attach(value, "Finalization token", detach: token);
  finalizer.attach(value, "Finalization token", detach: token);
  finalizer.attach(value, "Finalization token", detach: token);
}

main() async {
  Nonce token = Nonce(1);
  test(token);
  await triggerGcWithDelay();
  Expect.setEquals({token}, finalizerTokens);
  await triggerGcWithDelay();
  Expect.setEquals({token}, finalizerTokens);
  await triggerGcWithDelay();
  Expect.setEquals({token}, finalizerTokens);
  Expect.equals(1, cnt);
}