src/test/java/com/android/tools/r8/classmerging/horizontal/ClinitDeadlockAfterMergingMutuallyDependentClassesTest.java

// Copyright (c) 2021, the R8 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.

package com.android.tools.r8.classmerging.horizontal;

import com.android.tools.r8.NoHorizontalClassMerging;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.utils.codeinspector.HorizontallyMergedClassesInspector;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class ClinitDeadlockAfterMergingMutuallyDependentClassesTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection parameters() {
    return getTestParameters().withAllRuntimesAndApiLevels().build();
  }

  @Test
  public void test() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepClassAndMembersRules(Main.class)
        .addHorizontallyMergedClassesInspector(
            HorizontallyMergedClassesInspector::assertNoClassesMerged)
        .addOptionsModification(
            options ->
                options.horizontalClassMergerOptions().setEnableClassInitializerDeadlockDetection())
        .enableNoHorizontalClassMergingAnnotations()
        .setMinApi(parameters.getApiLevel())
        .compile();
  }

  static class Main {

    // @Keep
    public static void thread0() {
      // This will take the lock for A and then wait to take the lock for C (BC if B and C are
      // merged).
      System.out.println(A.c);
    }

    // @Keep
    public static void thread1() {
      // This will take the lock for B (BC if B and C are merged) and then wait to take the lock for
      // A.
      System.out.println(new B());
      System.out.println(B.a);
    }
  }

  @NoHorizontalClassMerging
  static class A {

    static C c = new C();
  }

  static class B {

    static A a = new A();
  }

  static class C {}
}