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 }