CdsSameObjectAlignment.java revision 8359:ed6389f70257 
1/*
2 * Copyright (c) 2013, 2015, 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 CdsSameObjectAlignment
26 * @summary Testing CDS (class data sharing) using varying object alignment.
27 *          Using same object alignment for each dump/load pair
28 * @library /testlibrary
29 * @modules java.base/sun.misc
30 *          java.management
31 */
32
33import jdk.test.lib.*;
34
35public class CdsSameObjectAlignment {
36    public static void main(String[] args) throws Exception {
37        String nativeWordSize = System.getProperty("sun.arch.data.model");
38        if (!Platform.is64bit()) {
39            System.out.println("ObjectAlignmentInBytes for CDS is only " +
40                "supported on 64bit platforms; this plaform is " +
41                nativeWordSize);
42            System.out.println("Skipping the test");
43        } else {
44            dumpAndLoadSharedArchive(8);
45            dumpAndLoadSharedArchive(16);
46            dumpAndLoadSharedArchive(32);
47            dumpAndLoadSharedArchive(64);
48        }
49    }
50
51    private static void
52    dumpAndLoadSharedArchive(int objectAlignmentInBytes) throws Exception {
53        String objectAlignmentArg = "-XX:ObjectAlignmentInBytes="
54            + objectAlignmentInBytes;
55        System.out.println("dumpAndLoadSharedArchive(): objectAlignmentInBytes = "
56            + objectAlignmentInBytes);
57
58        String filename = "./CdsSameObjectAlignment" + objectAlignmentInBytes + ".jsa";
59        // create shared archive
60        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
61            "-XX:+UnlockDiagnosticVMOptions",
62            "-XX:SharedArchiveFile=" + filename,
63            "-Xshare:dump",
64            objectAlignmentArg);
65
66        OutputAnalyzer output = new OutputAnalyzer(pb.start());
67        output.shouldContain("Loading classes to share");
68        output.shouldHaveExitValue(0);
69
70
71        // run using the shared archive
72        pb = ProcessTools.createJavaProcessBuilder(
73            "-XX:+UnlockDiagnosticVMOptions",
74            "-XX:SharedArchiveFile=" + filename,
75            "-Xshare:on",
76            objectAlignmentArg,
77            "-version");
78
79        output = new OutputAnalyzer(pb.start());
80
81        try {
82            output.shouldContain("sharing");
83            output.shouldHaveExitValue(0);
84        } catch (RuntimeException e) {
85            // CDS uses absolute addresses for performance.
86            // It will try to reserve memory at a specific address;
87            // there is a chance such reservation will fail
88            // If it does, it is NOT considered a failure of the feature,
89            // rather a possible expected outcome, though not likely
90            output.shouldContain("Unable to use shared archive");
91            output.shouldHaveExitValue(1);
92        }
93    }
94}
95