Test handling of final fields assigned multiple times
Change-Id: Ia3b8621812c2345d190e2096ceade16330c1e059
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/FinalFieldWithMultipleWritesTest.java b/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/FinalFieldWithMultipleWritesTest.java
new file mode 100644
index 0000000..26fde45
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/FinalFieldWithMultipleWritesTest.java
@@ -0,0 +1,88 @@
+// 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.ir.optimize.membervaluepropagation;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.graph.AccessFlags;
+import java.io.IOException;
+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;
+
+/**
+ * Tests the handling of final fields that are assigned more than once.
+ *
+ * <p>According to the JVM specification, fields that are declared final must never be assigned to
+ * after object construction, but the specification does not require that the field is assigned at
+ * most once.
+ */
+@RunWith(Parameterized.class)
+public class FinalFieldWithMultipleWritesTest extends TestBase {
+
+ @Parameter(0)
+ public TestParameters parameters;
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withAllRuntimesAndApiLevels().build();
+ }
+
+ @Test
+ public void testRuntime() throws Exception {
+ testForRuntime(parameters)
+ .addProgramClasses(Main.class)
+ .addProgramClassFileData(getTransformedClass())
+ .run(parameters.getRuntime(), Main.class)
+ .assertSuccessWithOutputLines("0", "1", "2", "2");
+ }
+
+ @Test
+ public void test() throws Exception {
+ testForR8(parameters.getBackend())
+ .addProgramClasses(Main.class)
+ .addProgramClassFileData(getTransformedClass())
+ .addKeepMainRule(Main.class)
+ .setMinApi(parameters.getApiLevel())
+ .compile()
+ .run(parameters.getRuntime(), Main.class)
+ .assertSuccessWithOutputLines("0", "1", "2", "2");
+ }
+
+ private static byte[] getTransformedClass() throws IOException, NoSuchFieldException {
+ return transformer(A.class)
+ .setAccessFlags(A.class.getDeclaredField("f"), AccessFlags::setFinal)
+ .transform();
+ }
+
+ static class Main {
+
+ public static void main(String[] args) {
+ A a = new A();
+ System.out.println(a.f);
+ }
+ }
+
+ static class A {
+
+ /* final */ int f;
+
+ A() {
+ System.out.println(this);
+ f = 1;
+ System.out.println(this);
+ f = 2;
+ System.out.println(this);
+ }
+
+ @Override
+ public String toString() {
+ return Integer.toString(f);
+ }
+ }
+}
