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.
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 package gc.g1.humongousObjects;
26
27 import jdk.test.lib.Asserts;
28 import sun.hotspot.WhiteBox;
29
30 import java.io.IOException;
31 import java.net.URL;
32 import java.net.URLClassLoader;
33 import java.nio.file.Files;
34 import java.nio.file.Path;
35 import java.nio.file.Paths;
36
37 /**
38 * @test gc.g1.humongousObjects.TestHumongousNonArrayAllocation
39 * @summary Checks that huge class' instances (ie with huge amount of fields) are allocated successfully
40 * @requires vm.gc.G1
41 * @requires vm.opt.G1HeapRegionSize == "null" | vm.opt.G1HeapRegionSize == "1M"
42 * @library /testlibrary /test/lib /
43 * @modules java.base/jdk.internal.misc
44 * @modules java.management
45 * @build sun.hotspot.WhiteBox
46 * gc.testlibrary.Helpers
47 * gc.g1.humongousObjects.G1SampleClass
48 * gc.g1.humongousObjects.TestHumongousNonArrayAllocation
49 *
50 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
51 * sun.hotspot.WhiteBox$WhiteBoxPermission
52 *
53 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
54 * -XX:G1HeapRegionSize=1M
55 * gc.g1.humongousObjects.TestHumongousNonArrayAllocation LARGEST_NON_HUMONGOUS
56 *
57 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
58 * -XX:G1HeapRegionSize=1M
59 * gc.g1.humongousObjects.TestHumongousNonArrayAllocation SMALLEST_HUMONGOUS
60 *
61 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
62 * -XX:G1HeapRegionSize=1M
63 * gc.g1.humongousObjects.TestHumongousNonArrayAllocation ONE_REGION_HUMONGOUS
64 *
65 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
66 * -XX:G1HeapRegionSize=1M
67 * gc.g1.humongousObjects.TestHumongousNonArrayAllocation TWO_REGION_HUMONGOUS
68 *
69 * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
70 * -XX:G1HeapRegionSize=1M
71 * gc.g1.humongousObjects.TestHumongousNonArrayAllocation MORE_THAN_TWO_REGION_HUMONGOUS
72 *
73 */
74
75 /**
76 * The test for objects which are instances of classes with a huge amount of fields. It's an alternative way to create
77 * a humongous object rather to allocate a long array.
78 * The size of a class object depends on the field declared in the class. So, the tests generates such classes to cover
79 * the following cases:
80 * largest non-humongous object (exactly half a region)
81 * smallest humongous object (half a region + sizeof(long))
82 * humongous object that takes exactly one region
83 * humongous object that takes more than one region (region + sizeof(long))
84 * humongous object that takes more than two regions (region * 2 + sizeof(long))
85 *
86 */
87 public class TestHumongousNonArrayAllocation {
88 private static final WhiteBox WB = WhiteBox.getWhiteBox();
89 private static final String CLASS_NAME_PREFIX = TestHumongousNonArrayAllocation.class.getSimpleName() + "_";
90
91 public static void main(String[] args) throws ClassNotFoundException, InstantiationException,
92 IllegalAccessException, IOException {
93
94 if (args.length != 1) {
95 throw new Error("Test Bug: Expected class name wasn't provided as command line argument");
96 }
97 G1SampleClass sampleClass = G1SampleClass.valueOf(args[0]);
98
99 Path wrkDir = Files.createTempDirectory(Paths.get(""), CLASS_NAME_PREFIX);
100 URL[] url = {wrkDir.toUri().toURL()};
101 URLClassLoader urlLoader = new URLClassLoader(url);
102
103 Object sampleObject;
104 try {
105 sampleObject = sampleClass.getCls(urlLoader, wrkDir, CLASS_NAME_PREFIX).newInstance();
106 } catch (Throwable throwable) {
107 throw new AssertionError("Test Bug: Cannot create object of provided class", throwable);
108 }
109
110 boolean isHumongous = WB.g1IsHumongous(sampleObject);
111 boolean shouldBeHumongous = (sampleClass.expectedInstanceSize() > (WB.g1RegionSize() / 2));
112
113 // Sanity check
114 Asserts.assertEquals(WB.getObjectSize(sampleObject), sampleClass.expectedInstanceSize(),
115 String.format("Test Bug: Object of class %s is expected to take %d bytes but it takes %d.",
116 sampleClass.name(), sampleClass.expectedInstanceSize(), WB.getObjectSize(sampleObject)));
117
118 // Test check
119 Asserts.assertEquals(isHumongous, shouldBeHumongous,
120 String.format("Object of class %s is expected to be %shumongous but it is not",
121 sampleClass.name(), (shouldBeHumongous ? "" : "non-")));
122 }
123
124 }