src/test/java/com/android/tools/r8/naming/applymapping/ApplyMappingAfterHorizontalMergingMethodTest.java

// Copyright (c) 2019, 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.naming.applymapping;

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

import com.android.tools.r8.NeverInline;
import com.android.tools.r8.R8TestCompileResult;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import java.nio.file.Path;
import java.util.Collections;
import org.junit.Assume;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

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

  // Will merge with B.
  public static class LibraryA {

    @NeverInline
    public static String bar() {
      return "LibraryA::foo";
    }
  }

  // Will merge with A.
  public static class LibraryB {

    @NeverInline
    public static String foo() {
      return LibraryA.bar();
    }
  }

  // Ensure kept entry hitting the merged classes.
  public static class LibraryMain {

    public static void main(String[] args) {
      System.out.println(LibraryB.foo());
    }
  }

  // Program class simply calling library main.
  public static class ProgramClass {

    public static void main(String[] args) {
      LibraryMain.main(args);
    }
  }

  // Test runner code follows.

  private static final Class<?>[] LIBRARY_CLASSES = {
      NeverInline.class,
      LibraryA.class,
      LibraryB.class,
      LibraryMain.class
  };

  private static final Class<?>[] PROGRAM_CLASSES = {
      ProgramClass.class
  };

  private Backend backend;

  @Parameterized.Parameters(name = "{0}")
  public static Backend[] data() {
    return Backend.values();
  }

  public ApplyMappingAfterHorizontalMergingMethodTest(Backend backend) {
    this.backend = backend;
  }

  @Test
  public void runOnJvm() throws Throwable {
    Assume.assumeTrue(backend == Backend.CF);
    testForJvm()
        .addProgramClasses(LIBRARY_CLASSES)
        .addProgramClasses(PROGRAM_CLASSES)
        .run(ProgramClass.class)
        .assertSuccessWithOutput(StringUtils.lines("LibraryA::foo"));
  }

  @Test
  public void b121042934() throws Exception {
    R8TestCompileResult libraryResult = testForR8(backend)
        .enableInliningAnnotations()
        .addProgramClasses(LIBRARY_CLASSES)
        .addKeepMainRule(LibraryMain.class)
        .compile();

    CodeInspector inspector = libraryResult.inspector();
    assertThat(inspector.clazz(LibraryMain.class), isPresent());
    // Classes A and B have been merged, check only one remains.
    assertTrue(inspector.clazz(LibraryA.class).isPresent()
        != inspector.clazz(LibraryB.class).isPresent());

    Path libraryOut = temp.newFolder().toPath().resolve("out.jar");
    libraryResult.writeToZip(libraryOut);
    testForR8(backend)
        .noTreeShaking()
        .noMinification()
        .addProgramClasses(PROGRAM_CLASSES)
        .addApplyMapping(libraryResult.getProguardMap())
        .addLibraryClasses(LIBRARY_CLASSES)
        .compile()
        .addRunClasspath(Collections.singletonList(libraryOut))
        .run(ProgramClass.class)
        .assertSuccessWithOutput(StringUtils.lines("LibraryA::foo"));
  }
}