| // 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.switches; |
| |
| import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent; |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import com.android.tools.r8.TestBase; |
| import com.android.tools.r8.TestParameters; |
| import com.android.tools.r8.utils.BooleanUtils; |
| import com.android.tools.r8.utils.codeinspector.ClassSubject; |
| import com.android.tools.r8.utils.codeinspector.InstructionSubject.JumboStringMode; |
| import com.android.tools.r8.utils.codeinspector.MethodSubject; |
| import java.util.List; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| import org.junit.runners.Parameterized.Parameters; |
| |
| @RunWith(Parameterized.class) |
| public class StringSwitchCaseRemovalWithCompileTimeHashCodeTest extends TestBase { |
| |
| private final boolean enableStringSwitchConversion; |
| private final TestParameters parameters; |
| |
| @Parameters(name = "{1}, enable string-switch conversion: {0}") |
| public static List<Object[]> data() { |
| return buildParameters( |
| BooleanUtils.values(), getTestParameters().withAllRuntimesAndApiLevels().build()); |
| } |
| |
| public StringSwitchCaseRemovalWithCompileTimeHashCodeTest( |
| boolean enableStringSwitchConversion, TestParameters parameters) { |
| this.enableStringSwitchConversion = enableStringSwitchConversion; |
| this.parameters = parameters; |
| } |
| |
| @Test |
| public void test() throws Exception { |
| testForR8(parameters.getBackend()) |
| .addProgramClasses(TestClass.class) |
| .addKeepMainRule(TestClass.class) |
| .addOptionsModification( |
| options -> { |
| options.enableStringSwitchConversion = enableStringSwitchConversion; |
| assertTrue(options.minimumStringSwitchSize >= 3); |
| options.minimumStringSwitchSize = 2; |
| }) |
| .setMinApi(parameters.getApiLevel()) |
| .run(parameters.getRuntime(), TestClass.class) |
| .assertSuccessWithOutputLines("FOO") |
| .inspect( |
| codeInspector -> { |
| ClassSubject main = codeInspector.clazz(TestClass.class); |
| assertThat(main, isPresent()); |
| MethodSubject mainMethod = main.mainMethod(); |
| assertThat(mainMethod, isPresent()); |
| assertEquals(0, countCall(mainMethod, "String", "hashCode")); |
| // Only "FOO" left |
| assertEquals( |
| 1, |
| mainMethod |
| .streamInstructions() |
| .filter(i -> i.isConstString(JumboStringMode.ALLOW)) |
| .count()); |
| // No branching points. |
| assertEquals( |
| 0, |
| mainMethod |
| .streamInstructions() |
| .filter(i -> i.isIf() || i.isIfEqz() || i.isIfNez()) |
| .count()); |
| }); |
| } |
| |
| static class TestClass { |
| private static String test(String input) { |
| switch (input) { |
| case "foo": return "FOO"; |
| case "bar": return "BAR"; |
| default: return "UNKNOWN"; |
| } |
| } |
| |
| public static void main(String... args) { |
| System.out.println(test("foo")); |
| } |
| } |
| } |