1 /* 2 * Copyright (c) 2014, 2017, 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 LFGarbageCollectedTest 26 * @bug 8046703 27 * @key randomness 28 * @ignore 8078602 29 * @summary Test verifies that lambda forms are garbage collected 30 * @author kshefov 31 * @library /lib/testlibrary /java/lang/invoke/common 32 * @build TestMethods 33 * @build LambdaFormTestCase 34 * @build LFGarbageCollectedTest 35 * @run main/othervm -Xmx64m 36 * -XX:SoftRefLRUPolicyMSPerMB=0 37 * -XX:+HeapDumpOnOutOfMemoryError 38 * -DHEAP_DUMP=false 39 * LFGarbageCollectedTest 40 */ 41 42 import java.lang.invoke.MethodHandle; 43 import java.lang.invoke.MethodType; 44 import java.lang.ref.PhantomReference; 45 import java.lang.ref.Reference; 46 import java.lang.ref.ReferenceQueue; 47 import java.lang.reflect.InvocationTargetException; 48 import java.util.EnumSet; 49 import java.util.Map; 50 51 /** 52 * Lambda forms garbage collection test class. 53 */ 54 public final class LFGarbageCollectedTest extends LambdaFormTestCase { 55 private static boolean HEAP_DUMP = Boolean.getBoolean("HEAP_DUMP"); 56 57 /** 58 * Constructor for a lambda forms garbage collection test case. 59 * 60 * @param testMethod A method from {@code j.l.i.MethodHandles} class that 61 * returns a {@code j.l.i.MethodHandle} instance. 62 */ 63 public LFGarbageCollectedTest(TestMethods testMethod) { 64 super(testMethod); 65 } 66 67 PhantomReference ph; 68 ReferenceQueue rq = new ReferenceQueue(); 69 MethodType mtype; 70 Map<String, Object> data; 71 72 @Override 73 public void doTest() { 74 try { 75 TestMethods testCase = getTestMethod(); 76 data = testCase.getTestCaseData(); 77 MethodHandle adapter; 78 try { 79 adapter = testCase.getTestCaseMH(data, TestMethods.Kind.ONE); 80 } catch (NoSuchMethodException ex) { 81 throw new Error("Unexpected exception", ex); 82 } 83 mtype = adapter.type(); 84 Object lambdaForm = INTERNAL_FORM.invoke(adapter); 85 if (lambdaForm == null) { 86 throw new Error("Unexpected error: Lambda form of the method handle is null"); 87 } 88 89 String kind = KIND_FIELD.get(lambdaForm).toString(); 90 if (kind.equals("IDENTITY")) { 91 // Ignore identity LambdaForms. 92 return; 93 } 94 95 ph = new PhantomReference(lambdaForm, rq); 96 lambdaForm = null; 97 adapter = null; 98 99 collectLambdaForm(); 100 } catch (IllegalAccessException | IllegalArgumentException | 101 InvocationTargetException ex) { 102 throw new Error("Unexpected exception", ex); 103 } 104 } 105 106 107 private void collectLambdaForm() throws IllegalAccessException { 108 // Usually, 2 System.GCs are necessary to enqueue a SoftReference. 109 System.gc(); 110 System.gc(); 111 112 Reference ref = null; 113 for (int i = 0; i < 10; i++) { 114 try { 115 ref = rq.remove(1000); 116 } catch (InterruptedException e) { 117 /* ignore */ 118 } 119 if (ref != null) { 120 break; 121 } 122 System.gc(); // If the reference hasn't been queued yet, trigger one more GC. 123 } 124 125 if (ref == null) { 126 dumpTestData(); 127 System.err.println("Method type: " + mtype); 128 System.err.println("LambdaForm: " + REF_FIELD.get(ph)); 129 130 if (HEAP_DUMP) { 131 // Trigger OOM to force heap dump for post-mortem analysis. 132 val = new long[1_000_000_000]; 133 } 134 throw new AssertionError("Error: LambdaForm is not garbage collected"); 135 }; 136 } 137 138 private void dumpTestData() { 139 System.err.println("Test case: " + getTestMethod()); 140 for (String s : data.keySet()) { 141 System.err.printf("\t%20s => %s\n", s, data.get(s)); 142 } 143 } 144 145 private static long[] val; 146 147 /** 148 * Main routine for lambda forms garbage collection test. 149 * 150 * @param args Accepts no arguments. 151 */ 152 public static void main(String[] args) { 153 // The "identity", "constant", "arrayElementGetter" and "arrayElementSetter" 154 // methods should be removed from this test, 155 // because their lambda forms are stored in a static field and are not GC'ed. 156 // There can be only a finite number of such LFs for each method, 157 // so no memory leak happens. 158 EnumSet<TestMethods> testMethods = EnumSet.complementOf(EnumSet.of( 159 TestMethods.IDENTITY, 160 TestMethods.CONSTANT, 161 TestMethods.ARRAY_ELEMENT_GETTER, 162 TestMethods.ARRAY_ELEMENT_SETTER, 163 TestMethods.EXACT_INVOKER, 164 TestMethods.INVOKER)); 165 LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods); 166 } 167 }