src/test/java/com/android/tools/r8/classmerging/horizontal/PreventMergeMainDexListTest.java

// Copyright (c) 2020, 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.classmerging.horizontal;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.IsNot.not;

import com.android.tools.r8.NeverClassInline;
import com.android.tools.r8.OutputMode;
import com.android.tools.r8.R8TestCompileResult;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.classmerging.horizontal.EmptyClassTest.A;
import com.android.tools.r8.classmerging.horizontal.EmptyClassTest.B;
import com.android.tools.r8.classmerging.horizontal.EmptyClassTest.Main;
import com.android.tools.r8.utils.BooleanUtils;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
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 PreventMergeMainDexListTest extends HorizontalClassMergingTestBase {
  public PreventMergeMainDexListTest(
      TestParameters parameters, boolean enableHorizontalClassMerging) {
    super(parameters, enableHorizontalClassMerging);
  }

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

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepClassAndMembersRules(Main.class)
        .addMainDexListClasses(A.class, Main.class)
        .addOptionsModification(
            options -> {
              options.enableHorizontalClassMerging = enableHorizontalClassMerging;
              options.minimalMainDex = true;
            })
        .enableNeverClassInliningAnnotations()
        .setMinApi(parameters.getApiLevel())
        .compile()
        .apply(this::checkCompileResult)
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithOutputLines("main dex");
  }

  private void checkCompileResult(R8TestCompileResult compileResult) throws Exception {
    Path out = temp.newFolder().toPath();
    compileResult.app.writeToDirectory(out, OutputMode.DexIndexed);
    Path classes = out.resolve("classes.dex");
    Path classes2 = out.resolve("classes2.dex");
    inspectMainDex(new CodeInspector(classes, compileResult.getProguardMap()));
    inspectSecondaryDex(new CodeInspector(classes2, compileResult.getProguardMap()));
  }

  private void inspectMainDex(CodeInspector inspector) {
    assertThat(inspector.clazz(A.class), isPresent());
    assertThat(inspector.clazz(B.class), not(isPresent()));
  }

  private void inspectSecondaryDex(CodeInspector inspector) {
    assertThat(inspector.clazz(A.class), not(isPresent()));
    assertThat(inspector.clazz(B.class), isPresent());
  }

  public static class Main {
    public static void main(String[] args) {
      A a = new A();
    }

    public static void otherDex() {
      B b = new B();
    }
  }

  @NeverClassInline
  public static class A {
    public A() {
      System.out.println("main dex");
    }
  }

  @NeverClassInline
  public static class B {
    public B() {
      System.out.println("not main dex");
    }
  }
}