1 /*
2 * Copyright (c) 2012, 2015, 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 * @test
26 * @bug 7190310
27 * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
28 * @modules java.base/jdk.internal.misc:+open
29 * @modules java.base/java.lang.ref:open
30 *
31 * @run main/othervm -Xbatch compiler.c2.Test7190310_unsafe
32 */
33
34 package compiler.c2;
35
36 import jdk.internal.misc.Unsafe;
37
38 import java.lang.ref.Reference;
39 import java.lang.ref.WeakReference;
40 import java.lang.reflect.Field;
41
42 public class Test7190310_unsafe {
43
44 static class TestObject {
45 public String toString() {
46 return "TestObject";
47 }
48 }
49
50 ;
51
52 private static TestObject str = new TestObject();
53 private static final WeakReference ref = new WeakReference(str);
54
55 private TestObject obj;
56
57 public static void main(String[] args) throws Exception {
58 Class c = Test7190310_unsafe.class.getClassLoader().loadClass("jdk.internal.misc.Unsafe");
59 Field f = c.getDeclaredField("theUnsafe");
60 f.setAccessible(true);
61 Unsafe unsafe = (Unsafe) f.get(c);
62
63 f = Reference.class.getDeclaredField("referent");
64 f.setAccessible(true);
65 long referent_offset = unsafe.objectFieldOffset(f);
66
67 Test7190310_unsafe t = new Test7190310_unsafe();
68 TestObject o = new TestObject();
69 t.obj = o;
70
71 // Warmup (compile methods)
72 System.err.println("Warmup");
73 Object obj = null;
74 for (int i = 0; i < 11000; i++) {
75 obj = getRef0(ref);
76 }
77 for (int i = 0; i < 11000; i++) {
78 obj = getRef1(unsafe, ref, referent_offset);
79 }
80 for (int i = 0; i < 11000; i++) {
81 obj = getRef2(unsafe, ref, referent_offset);
82 }
83 for (int i = 0; i < 11000; i++) {
84 obj = getRef3(unsafe, ref, referent_offset);
85 }
86 for (int i = 0; i < 11000; i++) {
87 obj = getRef4(unsafe, t, referent_offset);
88 }
89
90 // Access verification
91 System.err.println("Verification");
92 if (!verifyGet(referent_offset, unsafe)) {
93 System.exit(97);
94 }
95
96 obj = getRef3(unsafe, t, referent_offset);
97 if (obj != o) {
98 System.out.println("FAILED: unsafe.getReference(Object, " + referent_offset + ") " + obj + " != " + o);
99 System.exit(97);
100 }
101 obj = getRef4(unsafe, t, referent_offset);
102 if (obj != o) {
103 System.out.println("FAILED: unsafe.getReference(Test7190310, " + referent_offset + ") " + obj + " != " + o);
104 System.exit(97);
105 }
106 }
107
108 static boolean verifyGet(long referent_offset, Unsafe unsafe) throws Exception {
109 // Access verification
110 System.out.println("referent: " + str);
111 Object obj = getRef0(ref);
112 if (obj != str) {
113 System.out.println("FAILED: weakRef.get() " + obj + " != " + str);
114 return false;
115 }
116 obj = getRef1(unsafe, ref, referent_offset);
117 if (obj != str) {
118 System.out.println("FAILED: unsafe.getReference(weakRef, " + referent_offset + ") " + obj + " != " + str);
119 return false;
120 }
121 obj = getRef2(unsafe, ref, referent_offset);
122 if (obj != str) {
123 System.out.println("FAILED: unsafe.getReference(abstRef, " + referent_offset + ") " + obj + " != " + str);
124 return false;
125 }
126 obj = getRef3(unsafe, ref, referent_offset);
127 if (obj != str) {
128 System.out.println("FAILED: unsafe.getReference(Object, " + referent_offset + ") " + obj + " != " + str);
129 return false;
130 }
131 return true;
132 }
133
134 static Object getRef0(WeakReference ref) throws Exception {
135 return ref.get();
136 }
137
138 static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {
139 return unsafe.getReference(ref, referent_offset);
140 }
141
142 static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {
143 return unsafe.getReference(ref, referent_offset);
144 }
145
146 static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {
147 return unsafe.getReference(ref, referent_offset);
148 }
149
150 static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {
151 return unsafe.getReference(ref, referent_offset);
152 }
153 }
154