Regression test for virtual call to method with no side effects
Change-Id: Ifd609dea219c3639e4ea2d5e077ee4e1b288e81c
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/callsites/InvokeVirtualToKeptEmptyMethodTest.java b/src/test/java/com/android/tools/r8/ir/optimize/callsites/InvokeVirtualToKeptEmptyMethodTest.java
new file mode 100644
index 0000000..886238b
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/optimize/callsites/InvokeVirtualToKeptEmptyMethodTest.java
@@ -0,0 +1,116 @@
+// Copyright (c) 2023, 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.callsites;
+
+import static com.android.tools.r8.utils.codeinspector.CodeMatchers.invokesMethod;
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import com.android.tools.r8.R8TestCompileResult;
+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.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 InvokeVirtualToKeptEmptyMethodTest extends TestBase {
+
+ @Parameter(0)
+ public TestParameters parameters;
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withAllRuntimesAndApiLevels().build();
+ }
+
+ @Test
+ public void test() throws Exception {
+ R8TestCompileResult appCompileResult =
+ testForR8(parameters.getBackend())
+ .addProgramClasses(Main.class, I.class, A.class, Runner.class)
+ .addKeepMainRule(Main.class)
+ .addKeepClassAndMembersRules(I.class, Runner.class)
+ .setMinApi(parameters)
+ .compile()
+ .inspect(
+ inspector -> {
+ ClassSubject iClassSubject = inspector.clazz(I.class);
+ assertThat(iClassSubject, isPresent());
+
+ MethodSubject fooMethodSubject =
+ iClassSubject.uniqueMethodWithOriginalName("foo");
+ assertThat(fooMethodSubject, isPresent());
+
+ ClassSubject runnerClassSubject = inspector.clazz(Runner.class);
+ assertThat(runnerClassSubject, isPresent());
+
+ MethodSubject callFooMethodSubject =
+ runnerClassSubject.uniqueMethodWithOriginalName("callFoo");
+ assertThat(callFooMethodSubject, isPresent());
+ assertThat(callFooMethodSubject, invokesMethod(fooMethodSubject));
+ });
+
+ appCompileResult.run(parameters.getRuntime(), Main.class).assertSuccessWithEmptyOutput();
+
+ testForR8(parameters.getBackend())
+ .addProgramClasses(TestMain.class, B.class)
+ .addClasspathClasses(I.class, Runner.class)
+ .addKeepAllClassesRule()
+ .setMinApi(parameters)
+ .compile()
+ .addRunClasspathFiles(appCompileResult.writeToZip())
+ .run(parameters.getRuntime(), TestMain.class)
+ .assertSuccessWithOutputLines("Hello, world!");
+ }
+
+ static class Main {
+
+ public static void main(String[] args) {
+ Runner.callFoo(new A());
+ }
+ }
+
+ static class TestMain {
+
+ public static void main(String[] args) {
+ Runner.callFoo(new B());
+ }
+ }
+
+ public static class Runner {
+
+ public static void callFoo(I i) {
+ i.foo();
+ }
+ }
+
+ // @Keep
+ public interface I {
+
+ void foo();
+ }
+
+ static class A implements I {
+
+ @Override
+ public void foo() {
+ // Intentionally empty.
+ }
+ }
+
+ static class B implements I {
+
+ @Override
+ public void foo() {
+ System.out.println("Hello, world!");
+ }
+ }
+}
