1/*
2 * Copyright (c) 2015, 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.
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20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24package gc.g1.humongousObjects;
25
26import jdk.test.lib.Asserts;
27import sun.hotspot.WhiteBox;
28
29import java.io.IOException;
30import java.net.URL;
31import java.net.URLClassLoader;
32import java.nio.file.Files;
33import java.nio.file.Path;
34import java.nio.file.Paths;
35
36/**
37 * @test gc.g1.humongousObjects.TestHumongousNonArrayAllocation
38 * @summary Checks that huge class' instances (ie with huge amount of fields) are allocated successfully
39 * @requires vm.gc.G1
40 * @requires vm.opt.G1HeapRegionSize == "null" | vm.opt.G1HeapRegionSize == "1M"
41 * @library /test/lib /
42 * @modules java.base/jdk.internal.misc
43 * @modules java.management
44 * @build sun.hotspot.WhiteBox
45 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
46 *                                sun.hotspot.WhiteBox$WhiteBoxPermission
47 *
48 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
49 *                   -XX:G1HeapRegionSize=1M
50 *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation LARGEST_NON_HUMONGOUS
51 *
52 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
53 *                   -XX:G1HeapRegionSize=1M
54 *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation SMALLEST_HUMONGOUS
55 *
56 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
57 *                   -XX:G1HeapRegionSize=1M
58 *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation ONE_REGION_HUMONGOUS
59 *
60 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
61 *                   -XX:G1HeapRegionSize=1M
62 *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation TWO_REGION_HUMONGOUS
63 *
64 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
65 *                   -XX:G1HeapRegionSize=1M
66 *                   gc.g1.humongousObjects.TestHumongousNonArrayAllocation MORE_THAN_TWO_REGION_HUMONGOUS
67 *
68 */
69
70/**
71 * The test for objects which are instances of classes with a huge amount of fields. It's an alternative way to create
72 * a humongous object rather to allocate a long array.
73 * The size of a class object depends on the field declared in the class. So, the tests generates such classes to cover
74 * the following cases:
75 * largest non-humongous object (exactly half a region)
76 * smallest humongous object (half a region + sizeof(long))
77 * humongous object that takes exactly one region
78 * humongous object that takes more than one region (region + sizeof(long))
79 * humongous object that takes more than two regions (region * 2 + sizeof(long))
80 *
81 */
82public class TestHumongousNonArrayAllocation {
83    private static final WhiteBox WB = WhiteBox.getWhiteBox();
84    private static final String CLASS_NAME_PREFIX = TestHumongousNonArrayAllocation.class.getSimpleName() + "_";
85
86    public static void main(String[] args) throws ClassNotFoundException, InstantiationException,
87            IllegalAccessException, IOException {
88
89        if (args.length != 1) {
90            throw new Error("Test Bug: Expected class name wasn't provided as command line argument");
91        }
92        G1SampleClass sampleClass = G1SampleClass.valueOf(args[0]);
93
94        Path wrkDir = Files.createTempDirectory(Paths.get(""), CLASS_NAME_PREFIX);
95        URL[] url = {wrkDir.toUri().toURL()};
96        URLClassLoader urlLoader = new URLClassLoader(url);
97
98        Object sampleObject;
99        try {
100            sampleObject = sampleClass.getCls(urlLoader, wrkDir, CLASS_NAME_PREFIX).newInstance();
101        } catch (Throwable throwable) {
102            throw new AssertionError("Test Bug: Cannot create object of provided class", throwable);
103        }
104
105        boolean isHumongous = WB.g1IsHumongous(sampleObject);
106        boolean shouldBeHumongous = (sampleClass.expectedInstanceSize() > (WB.g1RegionSize() / 2));
107
108        // Sanity check
109        Asserts.assertEquals(WB.getObjectSize(sampleObject), sampleClass.expectedInstanceSize(),
110                String.format("Test Bug: Object of class %s is expected to take %d bytes but it takes %d.",
111                        sampleClass.name(), sampleClass.expectedInstanceSize(), WB.getObjectSize(sampleObject)));
112
113        // Test check
114        Asserts.assertEquals(isHumongous, shouldBeHumongous,
115                String.format("Object of class %s is expected to be %shumongous but it is not",
116                        sampleClass.name(), (shouldBeHumongous ? "" : "non-")));
117    }
118
119}
120