Regression test for removing default constructor.
Bug: b/248473941
Bug: b/247054688
Change-Id: Ia179d79e0d1261c82e7121aaa4086a13824b23e2
diff --git a/src/test/java/com/android/tools/r8/shaking/forceproguardcompatibility/defaultctor/KeepClassMembersDefaultCtorTest.java b/src/test/java/com/android/tools/r8/shaking/forceproguardcompatibility/defaultctor/KeepClassMembersDefaultCtorTest.java
new file mode 100644
index 0000000..1acd95b
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/shaking/forceproguardcompatibility/defaultctor/KeepClassMembersDefaultCtorTest.java
@@ -0,0 +1,93 @@
+// 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.shaking.forceproguardcompatibility.defaultctor;
+
+import com.android.tools.r8.ProguardVersion;
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.TestRunResult;
+import com.android.tools.r8.TestShrinkerBuilder;
+import com.android.tools.r8.utils.StringUtils;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class KeepClassMembersDefaultCtorTest extends TestBase {
+
+ static final String EXPECTED = StringUtils.lines("A()");
+
+ private final TestParameters parameters;
+
+ @Parameterized.Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withDefaultCfRuntime().build();
+ }
+
+ public KeepClassMembersDefaultCtorTest(TestParameters parameters) {
+ this.parameters = parameters;
+ }
+
+ @Test
+ public void testReference() throws Exception {
+ testForRuntime(parameters)
+ .addInnerClasses(KeepClassMembersDefaultCtorTest.class)
+ .run(parameters.getRuntime(), TestClass.class)
+ .assertSuccessWithOutput(EXPECTED);
+ }
+
+ @Test
+ public void testCompatR8() throws Exception {
+ // R8 retains the default constructor but inserts throw null.
+ // TODO(b/248473941): R8 should strip the constructor instead.
+ run(testForR8Compat(parameters.getBackend()))
+ .assertFailureWithErrorThatThrows(NullPointerException.class);
+ }
+
+ @Test
+ public void testPG() throws Exception {
+ run(testForProguard(ProguardVersion.getLatest()).addDontWarn(getClass()))
+ .assertFailureWithErrorThatThrows(NoSuchMethodException.class);
+ }
+
+ private TestRunResult<?> run(TestShrinkerBuilder<?, ?, ?, ?, ?> builder) throws Exception {
+ return builder
+ .addInnerClasses(KeepClassMembersDefaultCtorTest.class)
+ .addKeepRules("-keepclassmembers class * { <fields>; }")
+ .addKeepClassAndMembersRules(TestClass.class)
+ .addDontObfuscate()
+ .run(parameters.getRuntime(), TestClass.class);
+ }
+
+ static class A {
+
+ public long x = System.nanoTime();
+
+ public A() {
+ System.out.println("A()");
+ }
+ }
+
+ static class TestClass {
+
+ public static A getA() {
+ // Since TestClass.A is hard kept, the shrinker can't assume anything about the return value.
+ return null;
+ }
+
+ public static void main(String[] args) throws Exception {
+ String name = args.length == 0 ? "A" : null;
+ Class<?> clazz =
+ Class.forName(
+ TestClass.class.getPackage().getName() + ".KeepClassMembersDefaultCtorTest$" + name);
+ Object obj = clazz.getConstructor().newInstance();
+ if (args.length > 0) {
+ // Use the field so we are sure that the keep rule triggers.
+ A a = getA();
+ System.out.println(a.x);
+ }
+ }
+ }
+}
