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

// Copyright (c) 2024, 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 com.android.tools.r8.NeverClassInline;
import com.android.tools.r8.NeverInline;
import com.android.tools.r8.NoParameterTypeStrengthening;
import com.android.tools.r8.NoUnusedInterfaceRemoval;
import com.android.tools.r8.NoVerticalClassMerging;
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 VerticalClassMergerInvokeVirtualToInterfaceTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

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

  @Test
  public void test() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepMainRule(Main.class)
        .addVerticallyMergedClassesInspector(
            inspector -> inspector.assertMergedIntoSubtype(J.class).assertNoOtherClassesMerged())
        .enableInliningAnnotations()
        .enableNeverClassInliningAnnotations()
        .enableNoParameterTypeStrengtheningAnnotations()
        .enableNoUnusedInterfaceRemovalAnnotations()
        .enableNoVerticalClassMergingAnnotations()
        .setMinApi(parameters)
        .compile();
  }

  static class Main {

    public static void main(String[] args) {
      callOnI(new B());
      callOnJ(new B());
    }

    @NeverInline
    @NoParameterTypeStrengthening
    static void callOnI(I i) {
      i.m();
    }

    @NeverInline
    @NoParameterTypeStrengthening
    static void callOnJ(J j) {
      j.m();
    }
  }

  @NoUnusedInterfaceRemoval
  @NoVerticalClassMerging
  interface I {

    void m();
  }

  @NoUnusedInterfaceRemoval
  interface J {

    void m();
  }

  @NoVerticalClassMerging
  abstract static class A implements I, J {}

  @NeverClassInline
  static class B extends A {

    @NeverInline
    public void m() {
      System.out.println("Hello, world!");
    }
  }
}