| // 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.shaking.array; |
| |
| import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent; |
| import static org.hamcrest.CoreMatchers.not; |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assume.assumeTrue; |
| |
| import com.android.tools.r8.NeverInline; |
| import com.android.tools.r8.NeverPropagateValue; |
| 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 com.android.tools.r8.utils.codeinspector.ClassSubject; |
| import com.android.tools.r8.utils.codeinspector.CodeInspector; |
| import com.android.tools.r8.utils.codeinspector.InstructionSubject; |
| 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 DeadArrayLengthTest extends TestBase { |
| private static final Class<?> MAIN = TestClass.class; |
| private static final String EXPECTED_OUTPUT = StringUtils.lines("1", "Expected NPE", "3"); |
| |
| private final TestParameters parameters; |
| |
| @Parameterized.Parameters(name = "{0}") |
| public static TestParametersCollection data() { |
| return getTestParameters().withAllRuntimes().build(); |
| } |
| |
| public DeadArrayLengthTest(TestParameters parameters) { |
| this.parameters = parameters; |
| } |
| |
| private void inspect(CodeInspector inspector, boolean isR8) { |
| ClassSubject main = inspector.clazz(MAIN); |
| assertThat(main, isPresent()); |
| |
| MethodSubject nonNull = main.uniqueMethodWithName("clearlyNonNull"); |
| assertThat(nonNull, isPresent()); |
| assertEquals(0, countArrayLength(nonNull)); |
| |
| MethodSubject nullable = main.uniqueMethodWithName("isNullable"); |
| if (isR8) { |
| // Replaced with null-throwing code at the call site. |
| assertThat(nullable, not(isPresent())); |
| } else { |
| assertThat(nullable, isPresent()); |
| assertEquals(1, countArrayLength(nullable)); |
| } |
| |
| MethodSubject nullCheck = main.uniqueMethodWithName("afterNullCheck"); |
| assertThat(nullCheck, isPresent()); |
| assertEquals(isR8 ? 0 : 1, countArrayLength(nullCheck)); |
| } |
| |
| private long countArrayLength(MethodSubject method) { |
| return method.streamInstructions().filter(InstructionSubject::isArrayLength).count(); |
| } |
| |
| @Test |
| public void testD8() throws Exception { |
| assumeTrue(parameters.isDexRuntime()); |
| testForD8() |
| .release() |
| .addProgramClasses(MAIN) |
| .setMinApi(parameters.getRuntime()) |
| .run(parameters.getRuntime(), MAIN) |
| .assertSuccessWithOutput(EXPECTED_OUTPUT) |
| .inspect(codeInspector -> inspect(codeInspector, false)); |
| } |
| |
| @Test |
| public void testR8() throws Exception { |
| testForR8(parameters.getBackend()) |
| .addProgramClasses(MAIN) |
| .addKeepMainRule(MAIN) |
| .enableInliningAnnotations() |
| .enableMemberValuePropagationAnnotations() |
| .noMinification() |
| .setMinApi(parameters.getRuntime()) |
| .run(parameters.getRuntime(), MAIN) |
| .assertSuccessWithOutput(EXPECTED_OUTPUT) |
| .inspect(codeInspector -> inspect(codeInspector, true)); |
| } |
| |
| static class TestClass { |
| @NeverInline |
| @NeverPropagateValue |
| static int clearlyNonNull(int size) { |
| int[] array = new int[size]; |
| int l = array.length; |
| return System.currentTimeMillis() > 0 ? 1 : -1; |
| } |
| |
| @NeverInline |
| @NeverPropagateValue |
| static int isNullable(int[] args) { |
| // Not used, but can't be dead due to the potential NPE. |
| int l = args.length; |
| return System.currentTimeMillis() > 0 ? 2 : -2; |
| } |
| |
| @NeverInline |
| @NeverPropagateValue |
| static int afterNullCheck(int[] args) { |
| if (args != null) { |
| // Can be removed. |
| int l = args.length; |
| return System.currentTimeMillis() > 0 ? 8 : -8; |
| } |
| return System.currentTimeMillis() > 0 ? 3 : -3; |
| } |
| |
| public static void main(String[] args) { |
| System.out.println(clearlyNonNull(args.length)); |
| try { |
| System.out.println(isNullable(null)); |
| throw new AssertionError("Expect to see NPE"); |
| } catch (NullPointerException npe) { |
| System.out.println("Expected NPE"); |
| } |
| try { |
| System.out.println(afterNullCheck(null)); |
| } catch (NullPointerException npe) { |
| throw new AssertionError("Not expect to see NPE"); |
| } |
| } |
| } |
| } |