src/test/java/com/android/tools/r8/desugar/DesugarToClassFileInputCfVersion.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.desugar;

import static org.objectweb.asm.Opcodes.V1_4;
import static org.objectweb.asm.Opcodes.V1_5;
import static org.objectweb.asm.Opcodes.V1_6;
import static org.objectweb.asm.Opcodes.V1_7;
import static org.objectweb.asm.Opcodes.V1_8;
import static org.objectweb.asm.Opcodes.V9;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
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;
import org.junit.runners.Parameterized.Parameters;

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

  @Parameters(name = "{0}, input Cf version: {1}")
  public static List<Object[]> data() {
    return buildParameters(
        getTestParameters().withAllRuntimes().withAllApiLevelsAlsoForCf().build(),
        ImmutableList.of(V1_4, V1_5, V1_6, V1_7, V1_8, V9));
  }

  private final TestParameters parameters;
  private final int cfVersion;

  public DesugarToClassFileInputCfVersion(TestParameters parameters, int cfVersion) {
    this.parameters = parameters;
    this.cfVersion = cfVersion;
  }

  @Test
  public void test() throws Exception {
    // Use D8 to desugar with Java classfile output.
    Path jar =
        testForD8(Backend.CF)
            .addProgramClassFileData(transformer(TestClass.class).setVersion(cfVersion).transform())
            .setMinApi(parameters.getApiLevel())
            .compile()
            .writeToZip();

    if (parameters.getRuntime().isCf()) {
      // Run on the JVM given that Cf version is supported.
      if (cfVersion <= parameters.getRuntime().asCf().getVm().getClassfileVersion()) {
        testForJvm()
            .addProgramFiles(jar)
            .run(parameters.getRuntime(), TestClass.class)
            .assertSuccessWithOutputLines("Hello, world!");
      } else {
        testForJvm()
            .addProgramFiles(jar)
            .run(parameters.getRuntime(), TestClass.class)
            .assertFailureWithErrorThatThrows(UnsupportedClassVersionError.class);
      }
    } else {
      assert parameters.getRuntime().isDex();
      // Convert to DEX without desugaring.
      testForD8()
          .addProgramFiles(jar)
          .setMinApi(parameters.getApiLevel())
          .disableDesugaring()
          .run(parameters.getRuntime(), TestClass.class)
          .assertSuccessWithOutputLines("Hello, world!");
    }
  }

  static class TestClass {

    public static void main(String[] args) {
      if (System.currentTimeMillis() > 0) {
        System.out.println("Hello, world!");
      }
    }
  }
}