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comparison test/compiler/uncommontrap/TestSpecTrapClassUnloading.java @ 17728:b8413a9cbb84

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8031752: Failed speculative optimizations should be reattempted when root of compilation is different Summary: support for speculative traps that keep track of the root of the compilation in which a trap occurs. Reviewed-by: kvn, twisti
author roland
date Tue, 25 Feb 2014 18:16:24 +0100
parents
children 27689a7550a8
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17727:cfd4aac53239 17728:b8413a9cbb84
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
26 * @bug 8031752
27 * @summary speculative traps need to be cleaned up at GC
28 * @run main/othervm -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:+UnlockExperimentalVMOptions -XX:+UseTypeSpeculation -XX:TypeProfileLevel=222 -XX:CompileCommand=exclude,java.lang.reflect.Method::invoke -XX:CompileCommand=exclude,sun.reflect.DelegatingMethodAccessorImpl::invoke -Xmx1M TestSpecTrapClassUnloading
29 *
30 */
31
32 import java.lang.reflect.Method;
33
34 public class TestSpecTrapClassUnloading {
35 static class B {
36 final public boolean m(Object o) {
37 if (o.getClass() == B.class) {
38 return true;
39 }
40 return false;
41 }
42 }
43
44 static class MemoryChunk {
45 MemoryChunk other;
46 long[] array;
47 MemoryChunk(MemoryChunk other) {
48 other = other;
49 array = new long[1024 * 1024 * 1024];
50 }
51 }
52
53 static void m1(B b, Object o) {
54 b.m(o);
55 }
56
57 static void m2(B b, Object o) {
58 b.m(o);
59 }
60
61 public static void main(String[] args) throws Exception {
62 Method m = B.class.getMethod("m", Object.class);
63 Object o = new Object();
64 B b = new B();
65
66 // add speculative trap in B.m() for m1
67 for (int i = 0; i < 20000; i++) {
68 m1(b, b);
69 }
70 m1(b, o);
71
72 // add speculative trap in B.m() for code generated by reflection
73 for (int i = 0; i < 20000; i++) {
74 m.invoke(b, b);
75 }
76 m.invoke(b, o);
77
78 m = null;
79
80 // add speculative trap in B.m() for m2
81 for (int i = 0; i < 20000; i++) {
82 m2(b, b);
83 }
84 m2(b, o);
85
86 // Exhaust memory which causes the code generated by
87 // reflection to be unloaded but B.m() is not.
88 MemoryChunk root = null;
89 try {
90 while (true) {
91 root = new MemoryChunk(root);
92 }
93 } catch(OutOfMemoryError e) {
94 root = null;
95 }
96 }
97 }