src/test/java/com/android/tools/r8/keepanno/KeepFieldValueApiTest.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.keepanno;

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

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.keepanno.annotations.KeepForApi;
import com.android.tools.r8.keepanno.annotations.KeepItemKind;
import com.android.tools.r8.keepanno.annotations.KeepTarget;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.google.common.collect.ImmutableList;
import java.nio.file.Path;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

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

  static final String EXPECTED = StringUtils.lines("B::foo");

  private final TestParameters parameters;

  @Parameterized.Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters()
        .withDefaultRuntimes()
        .withApiLevel(AndroidApiLevel.B)
        .enableApiLevelsForCf()
        .build();
  }

  public KeepFieldValueApiTest(TestParameters parameters) {
    this.parameters = parameters;
  }

  @Test
  public void testReference() throws Exception {
    testForRuntime(parameters)
        .addProgramClasses(getLibraryClasses())
        .addProgramClasses(getClientClasses())
        .run(parameters.getRuntime(), TestClass.class)
        .assertSuccessWithOutput(EXPECTED);
  }

  @Test
  public void testWithRuleExtraction() throws Exception {
    Path lib =
        testForR8(parameters.getBackend())
            .enableExperimentalKeepAnnotations()
            .addProgramClasses(getLibraryClasses())
            .setMinApi(parameters)
            .compile()
            .inspect(this::checkLibraryOutput)
            .writeToZip();

    testForD8(parameters.getBackend())
        .addProgramClasses(getClientClasses())
        .addProgramFiles(lib)
        .setMinApi(parameters)
        .run(parameters.getRuntime(), TestClass.class)
        .assertSuccessWithOutput(EXPECTED);
  }

  public List<Class<?>> getLibraryClasses() {
    return ImmutableList.of(A.class, B.class);
  }

  public List<Class<?>> getClientClasses() {
    return ImmutableList.of(TestClass.class);
  }

  private void checkLibraryOutput(CodeInspector inspector) {
    ClassSubject aClass = inspector.clazz(A.class);
    assertThat(aClass, isPresent());
    assertThat(aClass.uniqueFieldWithFinalName("CLASS"), isPresent());
    ClassSubject bClass = inspector.clazz(B.class);
    assertThat(bClass, isPresent());
    assertThat(bClass.uniqueMethodWithOriginalName("foo"), isPresent());
    assertThat(bClass.uniqueMethodWithOriginalName("bar"), isPresent());
    assertThat(bClass.uniqueMethodWithOriginalName("baz"), isPresent());
  }

  public static class A {

    @KeepForApi(
        additionalTargets = {
          @KeepTarget(classConstant = B.class, kind = KeepItemKind.CLASS_AND_MEMBERS)
        })
    public static final String CLASS = "com.android.tools.r8.keepanno.KeepFieldValueApiTest$B";
  }

  public static class B {

    public void foo() {
      System.out.println("B::foo");
    }

    protected void bar() {
      System.out.println("B::bar");
    }

    void baz() {
      System.out.println("B::baz");
    }
  }

  static class TestClass {

    public static void main(String[] args) throws Exception {
      B b = (B) Class.forName(A.CLASS).getConstructor().newInstance();
      b.foo();
    }
  }
}