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 * @test TestReferenceCAS
26 * @summary Shenandoah reference CAS test
27 * @key gc
28 *
29 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC TestReferenceCAS
30 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -Xint TestReferenceCAS
31 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-TieredCompilation TestReferenceCAS
32 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=1 TestReferenceCAS
33 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=4 TestReferenceCAS
34 */
35
36 /*
37 * @test TestReferenceCAS
38 * @summary Shenandoah reference CAS test
39 * @key gc
40 * @requires (vm.bits == "64")
41 * @modules java.base/jdk.internal.misc:+open
42 *
43 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops TestReferenceCAS
44 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -Xint TestReferenceCAS
45 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:-TieredCompilation TestReferenceCAS
46 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=1 TestReferenceCAS
47 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=4 TestReferenceCAS
48 */
49
50 import java.lang.reflect.Field;
51
52 public class TestReferenceCAS {
53
54 static final int ITERS = Integer.getInteger("iters", 1);
55 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
56
57 static final sun.misc.Unsafe UNSAFE;
58 static final long V_OFFSET;
59
60 static {
61 try {
62 Field f = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
63 f.setAccessible(true);
64 UNSAFE = (sun.misc.Unsafe) f.get(null);
65 } catch (Exception e) {
66 throw new RuntimeException("Unable to get Unsafe instance.", e);
67 }
68
69 try {
70 Field vField = TestReferenceCAS.class.getDeclaredField("v");
71 V_OFFSET = UNSAFE.objectFieldOffset(vField);
72 } catch (Exception e) {
73 throw new RuntimeException(e);
74 }
75 }
76
77 Object v;
78
79 private static void assertEquals(boolean a, boolean b, String msg) {
80 if (a != b) {
81 throw new RuntimeException("a (" + a + ") != b (" + b + "): " + msg);
82 }
83 }
84
85 private static void assertEquals(Object a, Object b, String msg) {
86 if (!a.equals(b)) {
87 throw new RuntimeException("a (" + a.toString() + ") != b (" + b.toString() + "): " + msg);
88 }
89 }
90
91 public static void main(String[] args) {
92 TestReferenceCAS t = new TestReferenceCAS();
93 for (int c = 0; c < ITERS; c++) {
94 testAccess(t, V_OFFSET);
95 }
96 }
97
98 static void testAccess(Object base, long offset) {
99 String foo = new String("foo");
100 String bar = new String("bar");
101 String baz = new String("baz");
102 UNSAFE.putObject(base, offset, "foo");
103 {
104 String newval = bar;
105 boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", newval);
106 assertEquals(r, true, "success compareAndSwap Object");
107 assertEquals(newval, "bar", "must not destroy newval");
108 Object x = UNSAFE.getObject(base, offset);
109 assertEquals(x, "bar", "success compareAndSwap Object value");
110 }
111
112 {
113 String newval = baz;
114 boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", newval);
115 assertEquals(r, false, "failing compareAndSwap Object");
116 assertEquals(newval, "baz", "must not destroy newval");
117 Object x = UNSAFE.getObject(base, offset);
118 assertEquals(x, "bar", "failing compareAndSwap Object value");
119 }
120 }
121
122 }