1 /*
2 * Copyright (c) 2013 SAP SE. 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 8007898
27 * @summary Incorrect optimization of Memory Barriers in Matcher::post_store_load_barrier().
28 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation -XX:CICompilerCount=1 -XX:+StressGCM -XX:+StressLCM DekkerTest
29 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation -XX:CICompilerCount=1 -XX:+StressGCM -XX:+StressLCM DekkerTest
30 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation -XX:CICompilerCount=1 -XX:+StressGCM -XX:+StressLCM DekkerTest
31 * @author Martin Doerr martin DOT doerr AT sap DOT com
32 *
33 * Run 3 times since the failure is intermittent.
34 */
35
36 public class DekkerTest {
37
38 /*
39 Read After Write Test (basically a simple Dekker test with volatile variables)
40 Derived from the original jcstress test, available at:
41 http://hg.openjdk.java.net/code-tools/jcstress/file/6c339a5aa00d/
42 tests-custom/src/main/java/org/openjdk/jcstress/tests/volatiles/DekkerTest.java
43 */
44
45 static final int ITERATIONS = 1000000;
46
47 static class TestData {
48 public volatile int a;
49 public volatile int b;
50 }
51
52 static class ResultData {
53 public int a;
54 public int b;
55 }
56
57 TestData[] testDataArray;
58 ResultData[] results;
59
60 volatile boolean start;
61
62 public DekkerTest() {
63 testDataArray = new TestData[ITERATIONS];
64 results = new ResultData[ITERATIONS];
65 for (int i = 0; i < ITERATIONS; ++i) {
66 testDataArray[i] = new TestData();
67 results[i] = new ResultData();
68 }
69 start = false;
70 }
71
72 public void reset() {
73 for (int i = 0; i < ITERATIONS; ++i) {
74 testDataArray[i].a = 0;
75 testDataArray[i].b = 0;
76 results[i].a = 0;
77 results[i].b = 0;
78 }
79 start = false;
80 }
81
82 int actor1(TestData t) {
83 t.a = 1;
84 return t.b;
85 }
86
87 int actor2(TestData t) {
88 t.b = 1;
89 return t.a;
90 }
91
92 class Runner1 extends Thread {
93 public void run() {
94 do {} while (!start);
95 for (int i = 0; i < ITERATIONS; ++i) {
96 results[i].a = actor1(testDataArray[i]);
97 }
98 }
99 }
100
101 class Runner2 extends Thread {
102 public void run() {
103 do {} while (!start);
104 for (int i = 0; i < ITERATIONS; ++i) {
105 results[i].b = actor2(testDataArray[i]);
106 }
107 }
108 }
109
110 void testRunner() {
111 Thread thread1 = new Runner1();
112 Thread thread2 = new Runner2();
113 thread1.start();
114 thread2.start();
115 do {} while (!thread1.isAlive());
116 do {} while (!thread2.isAlive());
117 start = true;
118 Thread.yield();
119 try {
120 thread1.join();
121 thread2.join();
122 } catch (InterruptedException e) {
123 System.out.println("interrupted!");
124 System.exit(1);
125 }
126 }
127
128 boolean printResult() {
129 int[] count = new int[4];
130 for (int i = 0; i < ITERATIONS; ++i) {
131 int event_kind = (results[i].a << 1) + results[i].b;
132 ++count[event_kind];
133 }
134 if (count[0] == 0 && count[3] == 0) {
135 System.out.println("[not interesting]");
136 return false; // not interesting
137 }
138 String error = (count[0] == 0) ? " ok" : " disallowed!";
139 System.out.println("[0,0] " + count[0] + error);
140 System.out.println("[0,1] " + count[1]);
141 System.out.println("[1,0] " + count[2]);
142 System.out.println("[1,1] " + count[3]);
143 return (count[0] != 0);
144 }
145
146 public static void main(String args[]) {
147 DekkerTest test = new DekkerTest();
148 final int runs = 30;
149 int failed = 0;
150 for (int c = 0; c < runs; ++c) {
151 test.testRunner();
152 if (test.printResult()) {
153 failed++;
154 }
155 test.reset();
156 }
157 if (failed > 0) {
158 throw new InternalError("FAILED. Got " + failed + " failed ITERATIONS");
159 }
160 System.out.println("PASSED.");
161 }
162
163 }