src/test/java/com/android/tools/r8/classmerging/vertical/VerticalClassMergerPinnedMethodCollisionTest.java

// Copyright (c) 2023, 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.vertical;

import static com.android.tools.r8.utils.codeinspector.AssertUtils.assertFailsCompilation;

import com.android.tools.r8.NeverInline;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
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 VerticalClassMergerPinnedMethodCollisionTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

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

  @Test
  public void test() throws Exception {
    assertFailsCompilation(
        () ->
            testForR8(parameters.getBackend())
                .addInnerClasses(getClass())
                .addKeepMainRule(Main.class)
                .addKeepRules(
                    "-keep class " + UserSub.class.getTypeName() + " {",
                    "  void f(" + B.class.getTypeName() + ");",
                    "}")
                .addVerticallyMergedClassesInspector(
                    inspector -> inspector.assertMergedIntoSubtype(A.class))
                .enableInliningAnnotations()
                .setMinApi(parameters)
                .compile());
  }

  static class Main {

    public static void main(String[] args) {
      new User().f(new B());
      new UserSub().f(new B());
    }
  }

  static class A {}

  static class B extends A {

    @Override
    public String toString() {
      return "B";
    }
  }

  static class User {

    @NeverInline
    void f(A a) {
      System.out.println(a);
    }
  }

  static class UserSub extends User {

    void f(B b) {
      System.out.println(b);
    }
  }
}