1 /*
2 * Copyright (c) 2016, 2018, Red Hat, Inc. 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 /*
26 * Run standalone with: --add-exports java.base/jdk.internal.misc=ALL-UNNAMED --add-opens java.base/jdk.internal.misc=ALL-UNNAMED
27 */
28
29 /*
30 * @test TestReferenceCAS
31 * @summary Shenandoah reference CAS test
32 * @requires vm.gc.Shenandoah & !vm.graal.enabled
33 * @modules java.base/jdk.internal.misc:+open
34 *
35 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC TestReferenceCAS
36 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -Xint TestReferenceCAS
37 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-TieredCompilation TestReferenceCAS
38 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=1 TestReferenceCAS
39 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=4 TestReferenceCAS
40 */
41
42 /*
43 * @test TestReferenceCAS
44 * @summary Shenandoah reference CAS test
45 * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64")
46 * @modules java.base/jdk.internal.misc:+open
47 *
48 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops TestReferenceCAS
49 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -Xint TestReferenceCAS
50 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:-TieredCompilation TestReferenceCAS
51 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=1 TestReferenceCAS
52 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=4 TestReferenceCAS
53 */
54
55 import java.lang.reflect.Field;
56
57 public class TestReferenceCAS {
58
59 static final int ITERS = Integer.getInteger("iters", 1);
60 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
61
62 static final jdk.internal.misc.Unsafe UNSAFE;
63 static final long V_OFFSET;
64
65 static {
66 try {
67 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
68 f.setAccessible(true);
69 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
70 } catch (Exception e) {
71 throw new RuntimeException("Unable to get Unsafe instance.", e);
72 }
73
74 try {
75 Field vField = TestReferenceCAS.class.getDeclaredField("v");
76 V_OFFSET = UNSAFE.objectFieldOffset(vField);
77 } catch (Exception e) {
78 throw new RuntimeException(e);
79 }
80 }
81
82 Object v;
83
84 private static void assertEquals(boolean a, boolean b, String msg) {
85 if (a != b) {
86 throw new RuntimeException("a (" + a + ") != b (" + b + "): " + msg);
87 }
88 }
89
90 private static void assertEquals(Object a, Object b, String msg) {
91 if (!a.equals(b)) {
92 throw new RuntimeException("a (" + a.toString() + ") != b (" + b.toString() + "): " + msg);
93 }
94 }
95
96 public static void main(String[] args) {
97 TestReferenceCAS t = new TestReferenceCAS();
98 for (int c = 0; c < ITERS; c++) {
99 testAccess(t, V_OFFSET);
100 }
101 }
102
103 static void testAccess(Object base, long offset) {
104 String foo = new String("foo");
105 String bar = new String("bar");
106 String baz = new String("baz");
107 UNSAFE.putReference(base, offset, "foo");
108 {
109 String newval = bar;
110 boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval);
111 assertEquals(r, true, "success compareAndSet Object");
112 assertEquals(newval, "bar", "must not destroy newval");
113 Object x = UNSAFE.getReference(base, offset);
114 assertEquals(x, "bar", "success compareAndSet Object value");
115 }
116
117 {
118 String newval = baz;
119 boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval);
120 assertEquals(r, false, "failing compareAndSet Object");
121 assertEquals(newval, "baz", "must not destroy newval");
122 Object x = UNSAFE.getReference(base, offset);
123 assertEquals(x, "bar", "failing compareAndSet Object value");
124 }
125
126 UNSAFE.putReference(base, offset, "bar");
127 {
128 String newval = foo;
129 Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval);
130 assertEquals(r, "bar", "success compareAndExchange Object");
131 assertEquals(newval, "foo", "must not destroy newval");
132 Object x = UNSAFE.getReference(base, offset);
133 assertEquals(x, "foo", "success compareAndExchange Object value");
134 }
135
136 {
137 String newval = baz;
138 Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval);
139 assertEquals(r, "foo", "failing compareAndExchange Object");
140 assertEquals(newval, "baz", "must not destroy newval");
141 Object x = UNSAFE.getReference(base, offset);
142 assertEquals(x, "foo", "failing compareAndExchange Object value");
143 }
144
145 UNSAFE.putReference(base, offset, "bar");
146 {
147 String newval = foo;
148 boolean success = false;
149 for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
150 success = UNSAFE.weakCompareAndSetReference(base, offset, "bar", newval);
151 assertEquals(newval, "foo", "must not destroy newval");
152 }
153 assertEquals(success, true, "weakCompareAndSet Object");
154 Object x = UNSAFE.getReference(base, offset);
155 assertEquals(x, "foo", "weakCompareAndSet Object");
156 }
157 }
158
159 }