1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8242451 27 * @library /test/lib 28 * @summary Test that the LAMBDA_INSTANCE$ field is present depending 29 * on disableEagerInitialization 30 * @run main LambdaEagerInitTest 31 * @run main/othervm -Djdk.internal.lambda.disableEagerInitialization=true LambdaEagerInitTest 32 */ 33 34 import java.lang.reflect.Field; 35 import java.lang.reflect.Modifier; 36 import java.util.Arrays; 37 import java.util.HashSet; 38 import java.util.Set; 39 import java.util.stream.Collectors; 40 41 import static jdk.test.lib.Asserts.*; 42 43 public class LambdaEagerInitTest { 44 45 interface H {Object m(String s);} 46 47 private static Set<String> allowedStaticFields(boolean nonCapturing) { 48 Set<String> s = new HashSet<>(); 49 if (Boolean.getBoolean("jdk.internal.lambda.disableEagerInitialization")) { 50 if (nonCapturing) s.add("LAMBDA_INSTANCE$"); 51 } 52 return s; 53 } 54 55 private void nonCapturingLambda() { 56 H la = s -> s; 57 assertEquals("hi", la.m("hi")); 58 Class<? extends H> c1 = la.getClass(); 59 verifyLambdaClass(la.getClass(), true); 60 } 61 62 private void capturingLambda() { 63 H la = s -> concat(s, "foo"); 64 assertEquals("hi foo", la.m("hi")); 65 verifyLambdaClass(la.getClass(), false); 66 } 67 68 private void verifyLambdaClass(Class<?> c, boolean nonCapturing) { 69 Set<String> staticFields = new HashSet<>(); 70 Set<String> instanceFields = new HashSet<>(); 71 for (Field f : c.getDeclaredFields()) { 72 if (Modifier.isStatic(f.getModifiers())) { 73 staticFields.add(f.getName()); 74 } else { 75 instanceFields.add(f.getName()); 76 } 77 } 78 assertEquals(instanceFields.size(), nonCapturing ? 0 : 1, "Unexpected instance fields"); 79 assertEquals(staticFields, allowedStaticFields(nonCapturing), "Unexpected static fields"); 80 } 81 82 private String concat(String... ss) { 83 return Arrays.stream(ss).collect(Collectors.joining(" ")); 84 } 85 86 public static void main(String[] args) { 87 LambdaEagerInitTest test = new LambdaEagerInitTest(); 88 test.nonCapturingLambda(); 89 test.capturingLambda(); 90 } 91 } 92