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 *
29 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation
30 *                   -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
31 *                   -XX:+UseTypeSpeculation -XX:TypeProfileLevel=222
32 *                   -XX:CompileCommand=exclude,java.lang.reflect.Method::invoke
33 *                   -XX:CompileCommand=exclude,sun.reflect.DelegatingMethodAccessorImpl::invoke
34 *                   -Xmx512M
35 *                   compiler.profiling.TestSpecTrapClassUnloading
36 */
37
38package compiler.profiling;
39
40import java.lang.reflect.Method;
41
42public class TestSpecTrapClassUnloading {
43    static class B {
44        final public boolean m(Object o) {
45            if (o.getClass() == B.class) {
46                return true;
47            }
48            return false;
49        }
50    }
51
52    static class MemoryChunk {
53        MemoryChunk other;
54        long[] array;
55        MemoryChunk(MemoryChunk other) {
56            this.other = other;
57            array = new long[1024 * 1024 * 1024];
58        }
59    }
60
61    static void m1(B b, Object o) {
62        b.m(o);
63    }
64
65    static void m2(B b, Object o) {
66        b.m(o);
67    }
68
69    public static void main(String[] args) throws Exception {
70        Method m = B.class.getMethod("m", Object.class);
71        Object o = new Object();
72        B b = new B();
73
74        // add speculative trap in B.m() for m1
75        for (int i = 0; i < 20000; i++) {
76            m1(b, b);
77        }
78        m1(b, o);
79
80        // add speculative trap in B.m() for code generated by reflection
81        for (int i = 0; i < 20000; i++) {
82            m.invoke(b, b);
83        }
84        m.invoke(b, o);
85
86        m = null;
87
88        // add speculative trap in B.m() for m2
89        for (int i = 0; i < 20000; i++) {
90            m2(b, b);
91        }
92        m2(b, o);
93
94        // Exhaust memory which causes the code generated by
95        // reflection to be unloaded but B.m() is not.
96        MemoryChunk root = null;
97        try {
98            while (true) {
99                root = new MemoryChunk(root);
100            }
101        } catch(OutOfMemoryError e) {
102            root = null;
103        }
104    }
105}
106