Add reproduction for assertion error in trivial checkcast removal
Bug: 160856783
Change-Id: Idbf5dbebc2a4b2399799a5498476c9377c32155e
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/checkcast/CheckCastNullForTypeTest.java b/src/test/java/com/android/tools/r8/ir/optimize/checkcast/CheckCastNullForTypeTest.java
new file mode 100644
index 0000000..349c880
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/optimize/checkcast/CheckCastNullForTypeTest.java
@@ -0,0 +1,71 @@
+// Copyright (c) 2020, 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.checkcast;
+
+import static org.junit.Assert.assertThrows;
+
+import com.android.tools.r8.CompilationFailedException;
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.utils.StringUtils;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+/** This is a reproduction of b/160856783. */
+@RunWith(Parameterized.class)
+public class CheckCastNullForTypeTest extends TestBase {
+
+ private final TestParameters parameters;
+ private static final String EXPECTED = StringUtils.lines("null");
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withAllRuntimesAndApiLevels().build();
+ }
+
+ public CheckCastNullForTypeTest(TestParameters parameters) {
+ this.parameters = parameters;
+ }
+
+ @Test
+ public void testRuntime() throws Exception {
+ testForRuntime(parameters)
+ .addProgramClasses(A.class, Main.class)
+ .run(parameters.getRuntime(), Main.class)
+ .assertSuccessWithOutput(EXPECTED);
+ }
+
+ @Test
+ public void testR8() throws Exception {
+ assertThrows(
+ CompilationFailedException.class,
+ () ->
+ testForR8(parameters.getBackend())
+ .addProgramClasses(A.class, Main.class)
+ .setMinApi(parameters.getApiLevel())
+ .addKeepMainRule(Main.class)
+ .enableInliningAnnotations()
+ // TODO(b/160856783): This should not fail during compilation.
+ .run(parameters.getRuntime(), Main.class)
+ .assertSuccessWithOutput(EXPECTED));
+ }
+
+ public static class A {}
+
+ public static class Main {
+
+ public static void main(String[] args) {
+ A a = null;
+ Main main;
+ do {
+ main = (Main) (Object) a;
+ } while ((a = (A) null) != null);
+ System.out.println(a);
+ }
+ }
+}
