src/test/examplesJava17/records/RecordShrinkFieldTest.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 records;

import static org.junit.Assert.assertEquals;

import com.android.tools.r8.JdkClassFileProvider;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.utils.BooleanUtils;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import java.nio.file.Path;
import java.util.List;
import org.junit.Assume;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

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

  private static final String EXPECTED_RESULT_D8 =
      StringUtils.lines(
          "Person[unused=-1, name=Jane Doe, age=42]", "Person[unused=-1, name=Bob, age=42]");
  private static final String EXPECTED_RESULT_R8 = StringUtils.lines("a[a=Jane Doe]", "a[a=Bob]");
  private static final String EXPECTED_RESULT_R8_NO_MINIFICATION =
      StringUtils.lines(
          "RecordShrinkFieldTest$Person[name=Jane Doe]", "RecordShrinkFieldTest$Person[name=Bob]");

  private final TestParameters parameters;
  private final boolean minifying;

  public RecordShrinkFieldTest(TestParameters parameters, boolean minifying) {
    this.parameters = parameters;
    this.minifying = minifying;
  }

  @Parameterized.Parameters(name = "{0}, minifying: {1}")
  public static List<Object[]> data() {
    return buildParameters(
        getTestParameters().withDexRuntimes().withAllApiLevelsAlsoForCf().build(),
        BooleanUtils.values());
  }

  @Test
  public void testD8() throws Exception {
    Assume.assumeTrue("Only valid in R8", minifying);
    testForD8(parameters.getBackend())
        .addInnerClassesAndStrippedOuter(getClass())
        .setMinApi(parameters)
        .compile()
        .run(parameters.getRuntime(), RecordShrinkField.class)
        .assertSuccessWithOutput(EXPECTED_RESULT_D8);
  }

  @Test
  public void testR8() throws Exception {
    parameters.assumeR8TestParameters();
    testForR8(parameters.getBackend())
        .addInnerClassesAndStrippedOuter(getClass())
        .setMinApi(parameters)
        .addKeepMainRule(RecordShrinkField.class)
        .addDontObfuscateUnless(minifying)
        .compile()
        .inspect(inspector -> inspect(inspector, false))
        .run(parameters.getRuntime(), RecordShrinkField.class)
        .assertSuccessWithOutput(
            minifying ? EXPECTED_RESULT_R8 : EXPECTED_RESULT_R8_NO_MINIFICATION);
  }

  @Test
  public void testR8CfThenDex() throws Exception {
    parameters.assumeR8TestParameters();
    Path desugared =
        testForR8(Backend.CF)
            .addInnerClassesAndStrippedOuter(getClass())
            .addKeepMainRule(RecordShrinkField.class)
            .addDontObfuscateUnless(minifying)
            .addLibraryProvider(JdkClassFileProvider.fromSystemJdk())
            .compile()
            .writeToZip();
    testForR8(parameters.getBackend())
        .addProgramFiles(desugared)
        .setMinApi(parameters)
        .addKeepMainRule(RecordShrinkField.class)
        .addDontObfuscateUnless(minifying)
        .compile()
        .inspect(inspector -> inspect(inspector, true))
        .run(parameters.getRuntime(), RecordShrinkField.class)
        .assertSuccessWithOutput(
            minifying ? EXPECTED_RESULT_R8 : EXPECTED_RESULT_R8_NO_MINIFICATION);
  }

  private void inspect(CodeInspector inspector, boolean isCfThenDex) {
    ClassSubject recordClass = inspector.clazz(Person.class);
    if (!isCfThenDex || !minifying) {
      assertEquals(1, recordClass.allInstanceFields().size());
      assertEquals(
          "java.lang.String", recordClass.allInstanceFields().get(0).getField().type().toString());
    } else {
      assertEquals(0, recordClass.allInstanceFields().size());
    }
  }

  record Person(int unused, String name, int age) {
    Person(String name, int age) {
      this(-1, name, age);
    }
  }

  public class RecordShrinkField {

    public static void main(String[] args) {
      Person jane = new Person("Jane Doe", 42);
      Person bob = new Person("Bob", 42);
      System.out.println(jane);
      System.out.println(bob);
    }
  }
}