src/test/java/com/android/tools/r8/ir/optimize/ifs/TrivialObjectEqualsTest.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.ir.optimize.ifs;

import static com.android.tools.r8.utils.codeinspector.CodeMatchers.invokesMethodWithName;
import static com.android.tools.r8.utils.codeinspector.Matchers.isAbsent;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assume.assumeTrue;

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;

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

  private final TestParameters parameters;

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

  public TrivialObjectEqualsTest(TestParameters parameters) {
    this.parameters = parameters;
  }

  @Test
  public void testD8() throws Exception {
    assumeTrue(parameters.isDexRuntime());
    testForD8(parameters.getBackend())
        .addInnerClasses(getClass())
        .setMinApi(parameters.getApiLevel())
        .compile()
        .inspect(
            inspector ->
                assertThat(
                    inspector.clazz(Main.class).uniqueMethodWithName("dead"),
                    not(invokesMethodWithName("dead"))))
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithOutputLines("Hello world!");
  }

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepMainRule(Main.class)
        .enableInliningAnnotations()
        .setMinApi(parameters.getApiLevel())
        .compile()
        .inspect(
            inspector ->
                assertThat(inspector.clazz(Main.class).uniqueMethodWithName("dead"), isAbsent()))
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithOutputLines("Hello world!");
  }

  static class Main {

    public static void main(String[] args) {
      Object o1 = new Object();
      Object o2 = new Object();
      if (o1 == o1) {
        System.out.print("Hello");
      } else {
        dead();
      }
      if (o1 == o2) {
        dead();
      } else {
        System.out.println(" world!");
      }
    }

    @NeverInline
    static void dead() {
      System.out.println("Unexpected!");
    }
  }
}