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comparison test/runtime/8003720/Victim.java @ 7179:d0aa87f04bd5

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8003720: NPG: Method in interpreter stack frame can be deallocated Summary: Pass down a closure during root scanning to keep the class of the method alive. Reviewed-by: coleenp, jcoomes
author stefank
date Tue, 27 Nov 2012 10:13:20 +0100
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7178:19c1bd641922 7179:d0aa87f04bd5
1 /*
2 * Copyright (c) 2012, 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 public class Victim implements Test8003720.CallMe {
26 public void callme() {
27 // note: Victim.this is dead here
28 Test8003720.println("executing in loader=" + Victim.class.getClassLoader());
29
30 long now = System.currentTimeMillis();
31
32 while ((System.currentTimeMillis() - now) < Test8003720.DURATION) {
33 long count = VictimClassLoader.counter++;
34 if (count % 1000000 == 0) System.gc();
35 if (count % 16180000 == 0) blurb();
36 new Object[1].clone();
37 }
38 }
39 static void blurb() {
40 Test8003720.println("count=" + VictimClassLoader.counter);
41 }
42 static {
43 blather();
44 }
45 static void blather() {
46 new java.util.ArrayList<Object>(1000000);
47 Class<Victim> c = Victim.class;
48 Test8003720.println("initializing " + c + "#" + System.identityHashCode(c) + " in " + c.getClassLoader());
49 }
50 }