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 jdk.test.lib.TimeLimitedRunner 33 * @build TestMethods 34 * @build LambdaFormTestCase 35 * @build LFGarbageCollectedTest 36 * @run main/othervm -Xmx64m 37 * -XX:SoftRefLRUPolicyMSPerMB=0 38 * -XX:+HeapDumpOnOutOfMemoryError 39 * -DHEAP_DUMP=false 40 * LFGarbageCollectedTest 41 */ 42 43 import java.lang.invoke.MethodHandle; 44 import java.lang.invoke.MethodType; 45 import java.lang.ref.PhantomReference; 46 import java.lang.ref.Reference; 47 import java.lang.ref.ReferenceQueue; 48 import java.lang.reflect.InvocationTargetException; 49 import java.util.EnumSet; 50 import java.util.Map; 51 52 /** 53 * Lambda forms garbage collection test class. 54 */ 55 public final class LFGarbageCollectedTest extends LambdaFormTestCase { 56 private static boolean HEAP_DUMP = Boolean.getBoolean("HEAP_DUMP"); 57 58 /** 59 * Constructor for a lambda forms garbage collection test case. 60 * 61 * @param testMethod A method from {@code j.l.i.MethodHandles} class that 62 * returns a {@code j.l.i.MethodHandle} instance. 63 */ 64 public LFGarbageCollectedTest(TestMethods testMethod) { 65 super(testMethod); 66 } 67 68 PhantomReference ph; 69 ReferenceQueue rq = new ReferenceQueue(); 70 MethodType mtype; 71 Map<String, Object> data; 72 73 @Override 74 public void doTest() { 75 try { 76 TestMethods testCase = getTestMethod(); 77 data = testCase.getTestCaseData(); 78 MethodHandle adapter; 79 try { 80 adapter = testCase.getTestCaseMH(data, TestMethods.Kind.ONE); 81 } catch (NoSuchMethodException ex) { 82 throw new Error("Unexpected exception", ex); 83 } 84 mtype = adapter.type(); 85 Object lambdaForm = INTERNAL_FORM.invoke(adapter); 86 if (lambdaForm == null) { 87 throw new Error("Unexpected error: Lambda form of the method handle is null"); 88 } 89 90 String kind = KIND_FIELD.get(lambdaForm).toString(); 91 if (kind.equals("IDENTITY")) { 92 // Ignore identity LambdaForms. 93 return; 94 } 95 96 ph = new PhantomReference(lambdaForm, rq); 97 lambdaForm = null; 98 adapter = null; 99 100 collectLambdaForm(); 101 } catch (IllegalAccessException | IllegalArgumentException | 102 InvocationTargetException ex) { 103 throw new Error("Unexpected exception", ex); 104 } 105 } 106 107 108 private void collectLambdaForm() throws IllegalAccessException { 109 // Usually, 2 System.GCs are necessary to enqueue a SoftReference. 110 System.gc(); 111 System.gc(); 112 113 Reference ref = null; 114 for (int i = 0; i < 10; i++) { 115 try { 116 ref = rq.remove(1000); 117 } catch (InterruptedException e) { 118 /* ignore */ 119 } 120 if (ref != null) { 121 break; 122 } 123 System.gc(); // If the reference hasn't been queued yet, trigger one more GC. 124 } 125 126 if (ref == null) { 127 dumpTestData(); 128 System.err.println("Method type: " + mtype); 129 System.err.println("LambdaForm: " + REF_FIELD.get(ph)); 130 131 if (HEAP_DUMP) { 132 // Trigger OOM to force heap dump for post-mortem analysis. 133 val = new long[1_000_000_000]; 134 } 135 throw new AssertionError("Error: LambdaForm is not garbage collected"); 136 }; 137 } 138 139 private void dumpTestData() { 140 System.err.println("Test case: " + getTestMethod()); 141 for (String s : data.keySet()) { 142 System.err.printf("\t%20s => %s\n", s, data.get(s)); 143 } 144 } 145 146 private static long[] val; 147 148 /** 149 * Main routine for lambda forms garbage collection test. 150 * 151 * @param args Accepts no arguments. 152 */ 153 public static void main(String[] args) { 154 // The "identity", "constant", "arrayElementGetter" and "arrayElementSetter" 155 // methods should be removed from this test, 156 // because their lambda forms are stored in a static field and are not GC'ed. 157 // There can be only a finite number of such LFs for each method, 158 // so no memory leak happens. 159 EnumSet<TestMethods> testMethods = EnumSet.complementOf(EnumSet.of( 160 TestMethods.IDENTITY, 161 TestMethods.CONSTANT, 162 TestMethods.ARRAY_ELEMENT_GETTER, 163 TestMethods.ARRAY_ELEMENT_SETTER, 164 TestMethods.EXACT_INVOKER, 165 TestMethods.INVOKER)); 166 LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods); 167 } 168 }