| // 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.ir.optimize.extrasubclasses; |
| |
| import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent; |
| import static org.hamcrest.CoreMatchers.not; |
| import static org.hamcrest.MatcherAssert.assertThat; |
| |
| import com.android.tools.r8.NeverClassInline; |
| import com.android.tools.r8.TestBase; |
| import com.android.tools.r8.TestParameters; |
| import com.android.tools.r8.TestParametersCollection; |
| import com.android.tools.r8.utils.codeinspector.ClassSubject; |
| import com.android.tools.r8.utils.codeinspector.CodeInspector; |
| import java.nio.file.Path; |
| 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 AbstractClassAlsoImplementedByMissingClassTest extends TestBase { |
| |
| private final TestParameters parameters; |
| |
| @Parameters(name = "{0}") |
| public static TestParametersCollection data() { |
| return getTestParameters().withAllRuntimesAndApiLevels().build(); |
| } |
| |
| public AbstractClassAlsoImplementedByMissingClassTest(TestParameters parameters) { |
| this.parameters = parameters; |
| } |
| |
| /** |
| * Tests that it is possible to provide an implementation of an abstract class after the program |
| * has been compiled with R8, as long as the abstract class and its methods have been kept. |
| */ |
| @Test |
| public void test() throws Exception { |
| Path r8Out = |
| testForR8(parameters.getBackend()) |
| // C is not visible to the R8 compilation. |
| .addProgramClasses(TestClass.class, A.class, B.class) |
| // Helper is added on the classpath such that R8 doesn't know what it does. |
| .addClasspathClasses(Helper.class) |
| .addKeepMainRule(TestClass.class) |
| // Keeping A, A.<init>(), and A.kept() should make it possible to provide an |
| // implementation |
| // of A after the R8 compilation. |
| .addKeepRules( |
| "-keep class " + A.class.getTypeName() + " { void <init>(); void kept(); }") |
| .enableNeverClassInliningAnnotations() |
| .setMinApi(parameters.getApiLevel()) |
| .compile() |
| .inspect(this::inspect) |
| .writeToZip(); |
| |
| testForRuntime(parameters) |
| .addProgramClasses(C.class, Helper.class) |
| .addRunClasspathFiles(r8Out) |
| .run(parameters.getRuntime(), TestClass.class) |
| .assertSuccessWithOutputLines("Hello world!", "The end"); |
| } |
| |
| private void inspect(CodeInspector inspector) { |
| ClassSubject aClassSubject = inspector.clazz(A.class); |
| assertThat(aClassSubject.uniqueMethodWithName("kept"), isPresent()); |
| |
| ClassSubject bClassSubject = inspector.clazz(B.class); |
| assertThat(bClassSubject.uniqueMethodWithName("kept"), isPresent()); |
| |
| // A.notKept() and B.notKept() should not be present, because the only invoke instruction |
| // targeting A.notKept() should have been inlined. |
| assertThat(aClassSubject.uniqueMethodWithName("notKept"), not(isPresent())); |
| assertThat(bClassSubject.uniqueMethodWithName("notKept"), not(isPresent())); |
| } |
| |
| static class TestClass { |
| |
| public static void main(String[] args) { |
| // Casting `notAlwaysB` to B and invoking B.kept() would lead to a ClassCastException. |
| A notAlwaysB = System.currentTimeMillis() >= 0 ? Helper.getInstance() : new B(); |
| notAlwaysB.kept(); |
| |
| // We should be able to inline A.notKept() when the receiver is guaranteed to be B. |
| A alwaysB = new B(); |
| alwaysB.notKept(); |
| |
| System.out.println("The end"); |
| } |
| } |
| |
| abstract static class A { |
| |
| abstract void kept(); |
| |
| abstract void notKept(); |
| } |
| |
| @NeverClassInline |
| static class B extends A { |
| |
| @Override |
| public void kept() { |
| throw new RuntimeException(); |
| } |
| |
| @Override |
| public void notKept() { |
| System.out.println(" world!"); |
| } |
| } |
| |
| // Only declarations are visible via the classpath. |
| static class Helper { |
| |
| static A getInstance() { |
| return new C(); |
| } |
| } |
| |
| // Not visible during the R8 compilation. |
| static class C extends A { |
| |
| @Override |
| public void kept() { |
| System.out.print("Hello"); |
| } |
| |
| @Override |
| public void notKept() { |
| throw new RuntimeException(); |
| } |
| } |
| } |