src/test/java/com/android/tools/r8/repackage/RepackageLambdaMissingInterfaceTest.java

// Copyright (c) 2021, 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.repackage;

import static com.android.tools.r8.DiagnosticsMatcher.diagnosticMessage;
import static com.android.tools.r8.DiagnosticsMatcher.diagnosticType;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresentAndRenamed;
import static org.hamcrest.CoreMatchers.allOf;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.startsWith;
import static org.hamcrest.MatcherAssert.assertThat;

import com.android.tools.r8.NeverInline;
import com.android.tools.r8.R8TestCompileResult;
import com.android.tools.r8.R8TestMultiRunResult;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.utils.UnverifiableCfCodeDiagnostic;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class RepackageLambdaMissingInterfaceTest extends RepackageTestBase {

  public RepackageLambdaMissingInterfaceTest(
      String flattenPackageHierarchyOrRepackageClasses, TestParameters parameters) {
    super(flattenPackageHierarchyOrRepackageClasses, parameters);
  }

  @Test
  public void testR8WithoutRepackaging() throws Exception {
    runTest(false)
        .assertFailureWithErrorThatThrowsIf(parameters.isDexRuntime(), AbstractMethodError.class)
        .assertSuccessWithOutputLinesIf(parameters.isCfRuntime(), "0");
  }

  @Test
  public void testR8() throws Exception {
    runTest(true)
        .assertFailureWithErrorThatThrowsIf(parameters.isDexRuntime(), AbstractMethodError.class)
        .assertSuccessWithOutputLinesIf(parameters.isCfRuntime(), "0");
  }

  private R8TestMultiRunResult runTest(boolean repackage) throws Exception {
    R8TestCompileResult compileResult =
        testForR8(parameters.getBackend())
            .addProgramClasses(ClassWithLambda.class, Main.class)
            .addKeepMainRule(Main.class)
            .addKeepAttributeInnerClassesAndEnclosingMethod()
            .applyIf(repackage, this::configureRepackaging, this::configureNoRepackaging)
            .collectSyntheticItems()
            .setMinApi(parameters)
            .addDontWarn(MissingInterface.class)
            .allowDiagnosticWarningMessages(parameters.isDexRuntime())
            .noClassInlining()
            .enableInliningAnnotations()
            .compileWithExpectedDiagnostics(
                diagnostics -> {
                  if (parameters.isDexRuntime()) {
                    diagnostics.assertWarningsMatch(
                        allOf(
                            diagnosticType(UnverifiableCfCodeDiagnostic.class),
                            diagnosticMessage(
                                containsString(
                                    "Unverifiable code in `void "
                                        + ClassWithLambda.class.getTypeName()
                                        + ".callWithLambda()`"))));
                  }
                });
    return compileResult
        .inspect(
            inspector -> {
              // Find the generated lambda class
              if (repackage) {
                assertThat(ClassWithLambda.class, isRepackaged(inspector));
              } else {
                ClassSubject classWithLambdaSubject = inspector.clazz(ClassWithLambda.class);
                assertThat(classWithLambdaSubject, isPresentAndRenamed());
              }
              inspector.forAllClasses(
                  clazz -> {
                    if (clazz.isSynthesizedJavaLambdaClass(compileResult.getSyntheticItems())) {
                      assertThat(
                          clazz.getFinalName(),
                          startsWith(repackage ? getRepackagePackage() : "a."));
                    }
                  });
            })
        .addRunClasspathClasses(MissingInterface.class)
        .run(parameters.getRuntime(), Main.class);
  }

  public interface MissingInterface {

    void bar(int x);
  }

  public static class ClassWithLambda {

    @NeverInline
    public static void callWithLambda() {
      Main.foo(System.out::println);
    }
  }

  public static class Main {

    private static int argCount;

    @NeverInline
    public static void foo(MissingInterface i) {
      i.bar(argCount);
    }

    public static void main(String[] args) {
      argCount = args.length;
      ClassWithLambda.callWithLambda();
    }
  }
}