| // Copyright (c) 2019, 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.string; |
| |
| import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent; |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assume.assumeTrue; |
| |
| import com.android.tools.r8.TestBase; |
| import com.android.tools.r8.TestParameters; |
| import com.android.tools.r8.TestParametersCollection; |
| import com.android.tools.r8.utils.codeinspector.ClassSubject; |
| import com.android.tools.r8.utils.codeinspector.CodeInspector; |
| import com.android.tools.r8.utils.codeinspector.InstructionSubject.JumboStringMode; |
| import com.android.tools.r8.utils.codeinspector.MethodSubject; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| |
| @RunWith(Parameterized.class) |
| public class StringBuilderStoredToDeadFieldTest extends TestBase { |
| private static final Class<?> MAIN = TestClass.class; |
| |
| @Parameterized.Parameters(name = "{0}") |
| public static TestParametersCollection data() { |
| return getTestParameters().withAllRuntimes().build(); |
| } |
| |
| private final TestParameters parameters; |
| |
| public StringBuilderStoredToDeadFieldTest(TestParameters parameters) { |
| this.parameters = parameters; |
| } |
| |
| @Test |
| public void testR8() throws Exception { |
| assumeTrue("CF does not rewrite move results.", parameters.isDexRuntime()); |
| |
| testForR8(parameters.getBackend()) |
| .addInnerClasses(StringBuilderStoredToDeadFieldTest.class) |
| .addKeepMainRule(MAIN) |
| .noMinification() |
| .setMinApi(parameters.getRuntime()) |
| .run(parameters.getRuntime(), MAIN) |
| .assertSuccess() |
| .inspect(this::inspect); |
| } |
| |
| private void inspect(CodeInspector inspector) { |
| ClassSubject main = inspector.clazz(MAIN); |
| assertThat(main, isPresent()); |
| |
| MethodSubject mainMethod = main.mainMethod(); |
| assertThat(main, isPresent()); |
| |
| assertTrue( |
| mainMethod.streamInstructions().noneMatch( |
| i -> i.isInvoke() |
| && i.getMethod().holder.toDescriptorString().contains("StringBuilder"))); |
| assertTrue( |
| mainMethod.streamInstructions().noneMatch( |
| i -> i.isConstString(JumboStringMode.ALLOW))); |
| } |
| |
| static class TestClass { |
| static String neverRead; |
| |
| public static void main(String... args) { |
| StringBuilder b = new StringBuilder(); |
| b.append("CurrentTimeMillis: "); |
| b.append(System.currentTimeMillis()); |
| neverRead = b.toString(); |
| } |
| } |
| } |