Reproduce cast to int after enum unboxing
Bug: b/406300397
Change-Id: I1be6e80fa034defd4beed7ed4c2a9133b0d86e22
diff --git a/src/test/java/com/android/tools/r8/enumunboxing/CastToIntEnumUnboxingTest.java b/src/test/java/com/android/tools/r8/enumunboxing/CastToIntEnumUnboxingTest.java
new file mode 100644
index 0000000..86e341d
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/enumunboxing/CastToIntEnumUnboxingTest.java
@@ -0,0 +1,77 @@
+// Copyright (c) 2025, 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.enumunboxing;
+
+import static com.android.tools.r8.utils.codeinspector.AssertUtils.assertFailsCompilation;
+
+import com.android.tools.r8.NeverInline;
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+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 CastToIntEnumUnboxingTest extends TestBase {
+
+ @Parameter(0)
+ public TestParameters parameters;
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withAllRuntimesAndApiLevels().build();
+ }
+
+ @Test
+ public void test() throws Exception {
+ assertFailsCompilation(
+ () ->
+ testForR8(parameters.getBackend())
+ .addInnerClasses(getClass())
+ .addKeepMainRule(Main.class)
+ .addEnumUnboxingInspector(inspector -> inspector.assertUnboxed(MyEnum.class))
+ .enableInliningAnnotations()
+ .setMinApi(parameters)
+ .compile()
+ .run(parameters.getRuntime(), Main.class)
+ .assertSuccessWithOutputLines("B"));
+ }
+
+ static class Main {
+
+ public static void main(String[] args) {
+ // Argument propagation will strengthen the parameter type of Main#test to the type of
+ // MyEnum.B. We should be careful not to insert a cast to the MyEnum subclass since it could
+ // be rewritten to a cast to an int.
+ test(null);
+ test(MyEnum.B);
+ }
+
+ @NeverInline
+ static void test(MyEnum e) {
+ if (e != null) {
+ e.print();
+ }
+ }
+ }
+
+ enum MyEnum {
+ A,
+ B {
+ @NeverInline
+ @Override
+ void print() {
+ System.out.println("B");
+ }
+ };
+
+ @NeverInline
+ void print() {
+ System.out.println("A");
+ }
+ }
+}
