src/test/java/com/android/tools/r8/keepanno/compatissues/DefaultInitClassWithMembersRuleTest.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.keepanno.compatissues;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresentAndNotRenamed;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresentAndRenamed;
import static org.hamcrest.MatcherAssert.assertThat;

import com.android.tools.r8.ProguardVersion;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestRunResult;
import com.android.tools.r8.TestShrinkerBuilder;
import com.android.tools.r8.transformers.ClassFileTransformer.FieldPredicate;
import com.android.tools.r8.utils.StringUtils;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;

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

  static final String EXPECTED_KEPT = StringUtils.lines("A");
  static final String EXPECTED_RENAMED = StringUtils.lines("a");

  public enum Shrinker {
    PG,
    R8;

    public boolean isPG() {
      return this == PG;
    }
  }

  @Parameter(0)
  public TestParameters parameters;

  @Parameter(1)
  public Shrinker shrinker;

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

  private TestRunResult<?> runTest(String... keepRules) throws Exception {
    TestShrinkerBuilder<?, ?, ?, ?, ?> builder;
    if (shrinker.isPG()) {
      builder = testForProguard(ProguardVersion.getLatest()).addDontWarn(getClass());
    } else {
      builder = testForR8(parameters.getBackend());
    }
    return builder
        .addProgramClassFileData(
            transformer(A.class)
                .removeMethods(
                    (access, name, descriptor, signature, exceptions) ->
                        !"<init>()V".equals(name + descriptor))
                .removeFields(FieldPredicate.all())
                .transform())
        .addProgramClasses(TestClass.class)
        .addKeepMainRule(TestClass.class)
        .addKeepRules(keepRules)
        .run(parameters.getRuntime(), TestClass.class);
  }

  @Test
  public void testNoKeep() throws Exception {
    runTest()
        .assertSuccessWithOutput(EXPECTED_RENAMED)
        .inspect(inspector -> assertThat(inspector.clazz(A.class), isPresentAndRenamed()));
  }

  @Test
  public void testNoMembers() throws Exception {
    runTest("-keepclasseswithmembers class " + typeName(A.class) + " { }")
        .assertSuccessWithOutput(EXPECTED_KEPT)
        .inspect(inspector -> assertThat(inspector.clazz(A.class), isPresentAndNotRenamed()));
  }

  @Test
  public void testAllMembers() throws Exception {
    runTest("-keepclasseswithmembers class " + typeName(A.class) + " { *; }")
        .assertSuccessWithOutput(shrinker.isPG() ? EXPECTED_RENAMED : EXPECTED_KEPT)
        .inspect(
            inspector ->
                assertThat(
                    inspector.clazz(A.class),
                    // In PG the "any member" pattern also does not match <init>.
                    // That is likely a dup of not matching methods (b/322104143) and WAI for R8.
                    shrinker.isPG() ? isPresentAndRenamed() : isPresentAndNotRenamed()));
  }

  @Test
  public void testAllMethods() throws Exception {
    runTest("-keepclasseswithmembers class " + typeName(A.class) + " { *** *(...); }")
        .assertSuccessWithOutput(EXPECTED_KEPT)
        .inspect(inspector -> assertThat(inspector.clazz(A.class), isPresentAndNotRenamed()));
  }

  @Test
  public void testAllMethods2() throws Exception {
    runTest("-keepclasseswithmembers class " + typeName(A.class) + " { <methods>; }")
        .assertSuccessWithOutput(EXPECTED_KEPT)
        .inspect(inspector -> assertThat(inspector.clazz(A.class), isPresentAndNotRenamed()));
  }

  public static class A {
    // Only defines <init>() ensured via transformer.
  }

  static class TestClass {

    public static void main(String[] args) {
      System.out.println(A.class.getTypeName().substring(A.class.getTypeName().length() - 1));
    }
  }
}