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