src/test/java/com/android/tools/r8/rewrite/arrays/StringArrayWithNonUniqueValuesTest.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 static org.junit.Assert.assertEquals;

import com.android.tools.r8.CompilationMode;
import com.android.tools.r8.NeverInline;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestCompilerBuilder;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.dex.Constants;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.InstructionSubject;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import com.google.common.collect.ImmutableList;
import java.util.Arrays;
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 StringArrayWithNonUniqueValuesTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

  @Parameter(1)
  public CompilationMode compilationMode;

  @Parameter(2)
  public Integer maxMaterializingConstants;

  @Parameters(name = "{0}, mode = {1}, maxMaterializingConstants = {2}")
  public static Iterable<?> data() {
    return buildParameters(
        getTestParameters().withDefaultCfRuntime().withDexRuntimesAndAllApiLevels().build(),
        CompilationMode.values(),
        ImmutableList.of(Constants.U8BIT_MAX - 16, 2));
  }

  private static final String EXPECTED_OUTPUT = StringUtils.lines("100", "104");

  private void inspect(MethodSubject method, int constStrings, int puts) {
    boolean expectingFilledNewArray = canUseFilledNewArrayOfStringObjects(parameters);
    assertEquals(
        expectingFilledNewArray ? 0 : puts,
        method.streamInstructions().filter(InstructionSubject::isArrayPut).count());
    assertEquals(
        expectingFilledNewArray ? 1 : 0,
        method.streamInstructions().filter(InstructionSubject::isFilledNewArray).count());
    assertEquals(
        expectingFilledNewArray || parameters.isCfRuntime() ? puts : constStrings,
        method.streamInstructions().filter(InstructionSubject::isConstString).count());
  }

  private void configure(TestCompilerBuilder<?, ?, ?, ?, ?> builder) {
    builder.addOptionsModification(
        options ->
            options.rewriteArrayOptions().maxMaterializingConstants = maxMaterializingConstants);
  }

  private void inspect(CodeInspector inspector) {
    inspect(inspector.clazz(TestClass.class).uniqueMethodWithOriginalName("m1"), 1, 100);
    inspect(
        inspector.clazz(TestClass.class).uniqueMethodWithOriginalName("m2"),
        maxMaterializingConstants == 2 ? 32 : 26,
        104);
  }

  @Test
  public void testD8() throws Exception {
    parameters.assumeDexRuntime();
    testForD8(parameters.getBackend())
        .addInnerClasses(getClass())
        .setMinApi(parameters)
        .apply(this::configure)
        .run(parameters.getRuntime(), TestClass.class)
        .inspect(this::inspect)
        .assertSuccessWithOutput(EXPECTED_OUTPUT);
  }

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepMainRule(TestClass.class)
        .setMinApi(parameters)
        .enableInliningAnnotations()
        .addDontObfuscate()
        .apply(this::configure)
        .run(parameters.getRuntime(), TestClass.class)
        .inspect(this::inspect)
        .assertSuccessWithOutput(EXPECTED_OUTPUT);
  }

  public static final class TestClass {

    @NeverInline
    public static void m1() {
      String[] array =
          new String[] {
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
            "A", "A", "A", "A", "A", "A", "A", "A", "A", "A",
          };
      System.out.println(Arrays.asList(array).size());
    }

    @NeverInline
    public static void m2() {
      String[] array =
          new String[] {
            "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q",
                "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
            "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q",
                "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
            "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q",
                "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
            "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q",
                "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
          };
      System.out.println(Arrays.asList(array).size());
    }

    public static void main(String[] args) {
      m1();
      m2();
    }
  }
}