src/test/java/com/android/tools/r8/rewrite/arrays/ArrayPutsToArrayAliasTest.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.rewrite.arrays;

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 ArrayPutsToArrayAliasTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

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

  @Test
  public void testD8() throws Exception {
    parameters.assumeDexRuntime();
    testForD8()
        .addInnerClasses(getClass())
        .setMinApi(parameters)
        .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)
        .run(parameters.getRuntime(), Main.class)
        // TODO(b/280659987): Should succeed with "Hello, world!".
        .assertSuccessWithOutputLines("Hellonull");
  }

  static class Main {

    static String[] STRINGS;

    public static void main(String[] args) {
      init();
      test();
    }

    @NeverInline
    static void init() {
      STRINGS = new String[2];
      // Leads to an AssumeNotNull instruction in R8 during IR processing.
      String[] strings = STRINGS;
      strings[0] = "Hello";
      strings[1] = ", world!";
    }

    @NeverInline
    static void test() {
      System.out.print(STRINGS[0]);
      System.out.println(STRINGS[1]);
    }
  }
}