| // Copyright (c) 2022, 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.lambdas; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import com.android.tools.r8.DesugarTestConfiguration; |
| import com.android.tools.r8.TestBase; |
| import com.android.tools.r8.TestParameters; |
| import com.android.tools.r8.TestParametersCollection; |
| import com.android.tools.r8.synthesis.SyntheticItemsTestUtils; |
| import com.android.tools.r8.utils.StringUtils; |
| import com.android.tools.r8.utils.codeinspector.CodeInspector; |
| import com.android.tools.r8.utils.codeinspector.InstructionSubject; |
| import com.android.tools.r8.utils.codeinspector.MethodSubject; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| import org.junit.runners.Parameterized.Parameter; |
| import org.junit.runners.Parameterized.Parameters; |
| |
| @RunWith(Parameterized.class) |
| public class LambdaFactoryTest extends TestBase { |
| |
| @Parameter() public TestParameters parameters; |
| |
| @Parameters(name = "{0}") |
| public static TestParametersCollection data() { |
| return getTestParameters().withAllRuntimes().withAllApiLevelsAlsoForCf().build(); |
| } |
| |
| private static final String EXPECTED_OUTPUT = StringUtils.lines("1", "2", "3", "4.0", "5"); |
| |
| private boolean isLambdaFactoryMethod(MethodSubject method) { |
| return method.isSynthetic() && method.isStatic() && method.getFinalName().equals("create"); |
| } |
| |
| private boolean isInvokingLambdaFactoryMethod(InstructionSubject instruction) { |
| return instruction.isInvokeStatic() |
| && SyntheticItemsTestUtils.isExternalSynthetic( |
| instruction.getMethod().getHolderType().asClassReference()) |
| && instruction.getMethod().getName().toString().equals("create"); |
| } |
| |
| private void inspectDesugared(CodeInspector inspector) { |
| inspector.forAllClasses( |
| clazz -> { |
| if (SyntheticItemsTestUtils.isExternalSynthetic(clazz.getFinalReference())) { |
| assertTrue(clazz.allMethods().stream().anyMatch(this::isLambdaFactoryMethod)); |
| } |
| }); |
| assertEquals( |
| 3, |
| inspector |
| .clazz(TestClass.class) |
| .mainMethod() |
| .streamInstructions() |
| .filter(this::isInvokingLambdaFactoryMethod) |
| .count()); |
| } |
| |
| private void inspectNotDesugared(CodeInspector inspector) { |
| inspector.forAllClasses( |
| clazz -> { |
| if (SyntheticItemsTestUtils.isExternalSynthetic(clazz.getFinalReference())) { |
| assertTrue(clazz.allMethods().stream().noneMatch(this::isLambdaFactoryMethod)); |
| } |
| }); |
| assertEquals( |
| 0, |
| inspector |
| .clazz(TestClass.class) |
| .mainMethod() |
| .streamInstructions() |
| .filter(this::isInvokingLambdaFactoryMethod) |
| .count()); |
| } |
| |
| @Test |
| public void testDesugaring() throws Exception { |
| testForDesugaring( |
| parameters, |
| options -> { |
| options.testing.alwaysGenerateLambdaFactoryMethods = true; |
| }) |
| .addInnerClasses(getClass()) |
| .run(parameters.getRuntime(), TestClass.class) |
| .applyIf( |
| DesugarTestConfiguration::isDesugared, |
| r -> { |
| try { |
| r.inspect(this::inspectDesugared); |
| } catch (Exception e) { |
| fail(); |
| } |
| }, |
| r -> { |
| try { |
| r.inspect(this::inspectNotDesugared); |
| } catch (Exception e) { |
| fail(); |
| } |
| }) |
| .assertSuccessWithOutput(EXPECTED_OUTPUT); |
| } |
| |
| @Test |
| public void testR8() throws Exception { |
| testForR8(parameters.getBackend()) |
| .addInnerClasses(getClass()) |
| .addKeepMainRule(TestClass.class) |
| .setMinApi(parameters.getApiLevel()) |
| .run(parameters.getRuntime(), TestClass.class) |
| .inspect( |
| inspector -> { |
| if (parameters.isDexRuntime()) { |
| // Lambdas are fully inlined when desugaring. |
| assertEquals(1, inspector.allClasses().size()); |
| assertEquals(1, inspector.clazz(TestClass.class).allMethods().size()); |
| } |
| }) |
| .assertSuccessWithOutput(EXPECTED_OUTPUT); |
| } |
| |
| interface MyConsumer<T> { |
| void create(T o); |
| } |
| |
| interface MyTriConsumer<T, U, V> { |
| void accept(T o1, U o2, V o3); |
| } |
| |
| static class TestClass { |
| |
| public static void greet() { |
| System.out.println("1"); |
| } |
| |
| public static void greet(MyConsumer<String> consumer) { |
| consumer.create("2"); |
| } |
| |
| public static void greetTri(long l, double d, String s) { |
| System.out.println(l); |
| System.out.println(d); |
| System.out.println(s); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| ((Runnable) TestClass::greet).run(); |
| greet(System.out::println); |
| ((MyTriConsumer<Long, Double, String>) TestClass::greetTri).accept(3L, 4.0, "5"); |
| } |
| } |
| } |