1 /*
2 * Copyright (c) 2014, 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 * @summary Test verifies that lambda forms are garbage collected
28 * @author kshefov
29 * @library /lib/testlibrary/jsr292 /lib/testlibrary
30 * @build TestMethods
31 * @build LambdaFormTestCase
32 * @build LFGarbageCollectedTest
33 * @run main/othervm -Xmx64m -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+HeapDumpOnOutOfMemoryError -DHEAP_DUMP=false LFGarbageCollectedTest
34 */
35
36 import java.lang.invoke.MethodHandle;
37 import java.lang.invoke.MethodType;
38 import java.lang.ref.PhantomReference;
39 import java.lang.ref.Reference;
40 import java.lang.ref.ReferenceQueue;
41 import java.lang.reflect.Field;
42 import java.lang.reflect.InvocationTargetException;
43 import java.util.EnumSet;
44 import java.util.Map;
45
46 /**
47 * Lambda forms garbage collection test class.
48 */
49 public final class LFGarbageCollectedTest extends LambdaFormTestCase {
50 private static boolean HEAP_DUMP = Boolean.getBoolean("HEAP_DUMP");
51
52 /**
53 * Constructor for a lambda forms garbage collection test case.
54 *
55 * @param testMethod A method from {@code j.l.i.MethodHandles} class that
56 * returns a {@code j.l.i.MethodHandle} instance.
57 */
58 public LFGarbageCollectedTest(TestMethods testMethod) {
59 super(testMethod);
60 }
61
62 PhantomReference ph;
63 ReferenceQueue rq = new ReferenceQueue();
64 MethodType mtype;
65
66 @Override
67 public void doTest() {
68 try {
69 TestMethods testCase = getTestMethod();
70 if (testCase == TestMethods.EXACT_INVOKER || testCase == TestMethods.INVOKER) {
71 // Invokers aren't collected.
72 return;
73 }
74 Map<String, Object> data = testCase.getTestCaseData();
75 MethodHandle adapter;
76 try {
77 adapter = getTestMethod().getTestCaseMH(data, TestMethods.Kind.ONE);
78 } catch (NoSuchMethodException ex) {
79 throw new Error("Unexpected exception: ", ex);
80 }
81 mtype = adapter.type();
82 Object lambdaForm = LambdaFormTestCase.INTERNAL_FORM.invoke(adapter);
83 if (lambdaForm == null) {
84 throw new Error("Unexpected error: Lambda form of the method handle is null");
85 }
86 ph = new PhantomReference(lambdaForm, rq);
87 lambdaForm = null;
88 data = null;
89 adapter = null;
90
91 collectLambdaForm();
92 } catch (IllegalAccessException | IllegalArgumentException |
93 InvocationTargetException ex) {
94 throw new Error("Unexpected exception: ", ex);
95 }
96 }
97
98
99 private void collectLambdaForm() throws IllegalAccessException {
100 // Usually, 2 System.GCs are necessary to enqueue a SoftReference.
101 System.gc();
102 System.gc();
103
104 Reference ref = null;
105 for (int i = 0; i < 10; i++) {
106 try {
107 ref = rq.remove(1000);
108 } catch (InterruptedException e) {
109 /* ignore */
110 }
111 if (ref != null) {
112 break;
113 }
114 System.gc(); // If a reference hasn't been queued yet, trigger one more GC.
115 }
116
117 if (ref == null) {
118 dumpTestCase();
119 System.out.println("Method type: "+mtype);
120 System.out.println("LambdaForm: "+REF_FIELD.get(ph));
121
122 if (HEAP_DUMP) {
123 // Trigger OOM to force heap dump for post-mortem analysis.
124 val = new long[1_000_000_000];
125 }
126 throw new AssertionError("Error: LambdaForm is not garbage collected");
127 };
128 }
129
130 private static long[] val;
131 private static final Field REF_FIELD;
132 static {
133 try {
134 REF_FIELD = Reference.class.getDeclaredField("referent");
135 REF_FIELD.setAccessible(true);
136 } catch (Exception e) {
137 throw new Error(e);
138 }
139 }
140
141 /**
142 * Main routine for lambda forms garbage collection test.
143 *
144 * @param args Accepts no arguments.
145 */
146 public static void main(String[] args) {
147 // The "identity", "constant", "arrayElementGetter" and "arrayElementSetter"
148 // methods should be removed from this test,
149 // because their lambda forms are stored in a static field and are not GC'ed.
150 // There can be only a finite number of such LFs for each method,
151 // so no memory leak happens.
152 EnumSet<TestMethods> testMethods = EnumSet.complementOf(EnumSet.of(
153 TestMethods.IDENTITY,
154 TestMethods.CONSTANT,
155 TestMethods.ARRAY_ELEMENT_GETTER,
156 TestMethods.ARRAY_ELEMENT_SETTER));
157 LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods);
158 }
159 }