src/test/java/com/android/tools/r8/ir/analysis/sideeffect/NewObjectCanBePostponedTest.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.ir.analysis.sideeffect;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertTrue;

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.MethodSubject;
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 NewObjectCanBePostponedTest 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)
        .setMinApi(parameters)
        .compile()
        .inspect(
            inspector -> {
              MethodSubject mainMethodSubject = inspector.clazz(Main.class).mainMethod();
              assertThat(mainMethodSubject, isPresent());
              assertTrue(mainMethodSubject.getMethod().getCode().isEmptyVoidMethod());
            })
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithEmptyOutput();
  }

  static class Main {

    public static void main(String[] args) {
      Object o = A.f;
    }
  }

  static class A {

    static final Object f = new Object();
  }
}