1/*
2 * Copyright (c) 2014, 2016, 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 RandomAllocationTest
26 * @key stress
27 * @summary stressing code cache by allocating randomly sized "dummy" code blobs
28 * @library /test/lib /
29 * @modules java.base/jdk.internal.misc
30 *          java.management
31 *
32 * @build sun.hotspot.WhiteBox
33 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
34 *                                sun.hotspot.WhiteBox$WhiteBoxPermission
35 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
36 *                   -XX:+WhiteBoxAPI
37 *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method
38 *                   -XX:-SegmentedCodeCache
39 *                   compiler.codecache.stress.RandomAllocationTest
40 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
41 *                   -XX:+WhiteBoxAPI
42 *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method
43 *                   -XX:+SegmentedCodeCache
44 *                   compiler.codecache.stress.RandomAllocationTest
45 */
46
47package compiler.codecache.stress;
48
49import sun.hotspot.code.BlobType;
50
51import java.util.ArrayList;
52
53public class RandomAllocationTest implements Runnable {
54    private static final long CODE_CACHE_SIZE
55            = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");
56    private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7);
57    private static final BlobType[] BLOB_TYPES
58            = BlobType.getAvailable().toArray(new BlobType[0]);
59
60    public static void main(String[] args) {
61        new CodeCacheStressRunner(new RandomAllocationTest()).runTest();
62    }
63
64    private final ArrayList<Long> blobs = new ArrayList<>();
65    @Override
66    public void run() {
67        boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean();
68        if (allocate) {
69            int type = Helper.RNG.nextInt(BLOB_TYPES.length);
70            long addr = Helper.WHITE_BOX.allocateCodeBlob(
71                    Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);
72            if (addr != 0) {
73                blobs.add(addr);
74            }
75        } else {
76            int index = Helper.RNG.nextInt(blobs.size());
77            Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));
78        }
79    }
80
81}
82