| // 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) |
| .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); |
| } |
| } |
| } |