1 /*
2 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 /*
25 * Run standalone with: --add-exports java.base/jdk.internal.misc=ALL-UNNAMED --add-opens java.base/jdk.internal.misc=ALL-UNNAMED
26 */
27
28 /*
29 * @test Shenandoah reference CAS test
30 * @modules java.base/jdk.internal.misc:+open
31 *
32 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC TestReferenceCAS
33 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -Xint TestReferenceCAS
34 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-TieredCompilation TestReferenceCAS
35 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=1 TestReferenceCAS
36 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=4 TestReferenceCAS
37 *
38 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops TestReferenceCAS
39 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -Xint TestReferenceCAS
40 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:-TieredCompilation TestReferenceCAS
41 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=1 TestReferenceCAS
42 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=4 TestReferenceCAS
43 */
44
45 import java.lang.reflect.Field;
46
47 public class TestReferenceCAS {
48
49 static final int ITERS = Integer.getInteger("iters", 1);
50 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
51
52 static final jdk.internal.misc.Unsafe UNSAFE;
53 static final long V_OFFSET;
54
55 static {
56 try {
57 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
58 f.setAccessible(true);
59 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
60 } catch (Exception e) {
61 throw new RuntimeException("Unable to get Unsafe instance.", e);
62 }
63
64 try {
65 Field vField = TestReferenceCAS.class.getDeclaredField("v");
66 V_OFFSET = UNSAFE.objectFieldOffset(vField);
67 } catch (Exception e) {
68 throw new RuntimeException(e);
69 }
70 }
71
72 Object v;
73
74 private static void assertEquals(boolean a, boolean b, String msg) {
75 if (a != b) {
76 throw new RuntimeException("a (" + a + ") != b (" + b + "): " + msg);
77 }
78 }
79
80 private static void assertEquals(Object a, Object b, String msg) {
81 if (!a.equals(b)) {
82 throw new RuntimeException("a (" + a.toString() + ") != b (" + b.toString() + "): " + msg);
83 }
84 }
85
86 public static void main(String[] args) {
87 TestReferenceCAS t = new TestReferenceCAS();
88 for (int c = 0; c < ITERS; c++) {
89 testAccess(t, V_OFFSET);
90 }
91 }
92
93 static void testAccess(Object base, long offset) {
94 String foo = new String("foo");
95 String bar = new String("bar");
96 String baz = new String("baz");
97 UNSAFE.putReference(base, offset, "foo");
98 {
99 String newval = bar;
100 boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval);
101 assertEquals(r, true, "success compareAndSet Object");
102 assertEquals(newval, "bar", "must not destroy newval");
103 Object x = UNSAFE.getReference(base, offset);
104 assertEquals(x, "bar", "success compareAndSet Object value");
105 }
106
107 {
108 String newval = baz;
109 boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval);
110 assertEquals(r, false, "failing compareAndSet Object");
111 assertEquals(newval, "baz", "must not destroy newval");
112 Object x = UNSAFE.getReference(base, offset);
113 assertEquals(x, "bar", "failing compareAndSet Object value");
114 }
115
116 UNSAFE.putReference(base, offset, "bar");
117 {
118 String newval = foo;
119 Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval);
120 assertEquals(r, "bar", "success compareAndExchange Object");
121 assertEquals(newval, "foo", "must not destroy newval");
122 Object x = UNSAFE.getReference(base, offset);
123 assertEquals(x, "foo", "success compareAndExchange Object value");
124 }
125
126 {
127 String newval = baz;
128 Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval);
129 assertEquals(r, "foo", "failing compareAndExchange Object");
130 assertEquals(newval, "baz", "must not destroy newval");
131 Object x = UNSAFE.getReference(base, offset);
132 assertEquals(x, "foo", "failing compareAndExchange Object value");
133 }
134
135 UNSAFE.putReference(base, offset, "bar");
136 {
137 String newval = foo;
138 boolean success = false;
139 for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
140 success = UNSAFE.weakCompareAndSetReference(base, offset, "bar", newval);
141 assertEquals(newval, "foo", "must not destroy newval");
142 }
143 assertEquals(success, true, "weakCompareAndSet Object");
144 Object x = UNSAFE.getReference(base, offset);
145 assertEquals(x, "foo", "weakCompareAndSet Object");
146 }
147 }
148
149 }