Add reproduction of b/395489597
Bug: b/395489597
Change-Id: If769fae5db93ee8e2cfc1cf9feeddd847b00832b
diff --git a/src/test/java/com/android/tools/r8/deadcode/DifferentAssumptionsOnReturnValuesTest.java b/src/test/java/com/android/tools/r8/deadcode/DifferentAssumptionsOnReturnValuesTest.java
new file mode 100644
index 0000000..e41e378
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/deadcode/DifferentAssumptionsOnReturnValuesTest.java
@@ -0,0 +1,82 @@
+// 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.deadcode;
+
+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 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.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+// This is a regression test for b/395489597.
+@RunWith(Parameterized.class)
+public class DifferentAssumptionsOnReturnValuesTest extends TestBase {
+
+ @Parameter(0)
+ public TestParameters parameters;
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withAllRuntimesAndApiLevels().build();
+ }
+
+ private static final String EXPECTED_OUTPUT = StringUtils.lines("f(null)", "f returned null");
+ private static final String NOT_EXPECTED_OUTPUT =
+ StringUtils.lines("f(null)", "f returned non null");
+
+ @Test
+ public void testJvm() throws Exception {
+ parameters.assumeJvmTestParameters();
+ testForJvm(parameters)
+ .addInnerClasses(getClass())
+ .run(parameters.getRuntime(), TestClass.class)
+ .assertSuccessWithOutput(EXPECTED_OUTPUT);
+ }
+
+ @Test
+ public void testD8() throws Exception {
+ parameters.assumeDexRuntime();
+ testForD8(parameters.getBackend())
+ .addInnerClasses(getClass())
+ .setMinApi(parameters)
+ .run(parameters.getRuntime(), TestClass.class)
+ .assertSuccessWithOutput(EXPECTED_OUTPUT);
+ }
+
+ @Test
+ public void testR8() throws Exception {
+ testForR8(parameters.getBackend())
+ .addInnerClasses(getClass())
+ .addKeepMainRule(TestClass.class)
+ .setMinApi(parameters)
+ .enableInliningAnnotations()
+ .run(parameters.getRuntime(), TestClass.class)
+ // TODO(b/395489597): This should not happen.
+ .assertSuccessWithOutput(NOT_EXPECTED_OUTPUT);
+ }
+
+ static class TestClass {
+ @NeverInline
+ public static Object f(Object o) {
+ System.out.println("f(" + ((o == null) ? "null" : "not null") + ")");
+ if (o != null) {
+ return o;
+ }
+ return o;
+ }
+
+ public static void main(String[] args) {
+ if (f(System.currentTimeMillis() > 0 ? null : new Object()) != null) {
+ System.out.println("f returned non null");
+ } else {
+ System.out.println("f returned null");
+ }
+ }
+ }
+}
