1 /*
  2  * Copyright (c) 2018, Red Hat, Inc. 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 id=aggressive-verify
 26  * @summary Test JNI Global Refs with Shenandoah
 27  * @requires vm.gc.Shenandoah
 28  *
 29  * @run main/othervm/native -Xmx1g -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 30  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 31  *      -XX:+ShenandoahVerify
 32  *      TestJNIGlobalRefs
 33  */
 34 
 35 /* @test id=aggressive
 36  * @summary Test JNI Global Refs with Shenandoah
 37  * @requires vm.gc.Shenandoah
 38  *
 39  * @run main/othervm/native -Xmx1g -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 40  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 41  *      TestJNIGlobalRefs
 42  */
 43 
 44 import java.util.Arrays;
 45 import java.util.Random;
 46 
 47 public class TestJNIGlobalRefs {
 48     static {
 49         System.loadLibrary("TestJNIGlobalRefs");
 50     }
 51 
 52     private static final long TIME_NSEC = 120L * 1_000_000_000L;
 53     private static final int ARRAY_SIZE = 10000;
 54 
 55     private static native void makeGlobalRef(Object o);
 56     private static native void makeWeakGlobalRef(Object o);
 57     private static native Object readGlobalRef();
 58     private static native Object readWeakGlobalRef();
 59 
 60     public static void main(String[] args) throws Throwable {
 61         seedGlobalRef();
 62         seedWeakGlobalRef();
 63         long startNanos = System.nanoTime();
 64         long currentNanos = startNanos;
 65         while (currentNanos - startNanos < TIME_NSEC) {
 66             testGlobal();
 67             testWeakGlobal();
 68             Thread.sleep(1);
 69             currentNanos = System.nanoTime();
 70         }
 71     }
 72 
 73     private static void seedGlobalRef() {
 74         int[] a = new int[ARRAY_SIZE];
 75         fillArray(a, 1337);
 76         makeGlobalRef(a);
 77     }
 78 
 79     private static void seedWeakGlobalRef() {
 80         int[] a = new int[ARRAY_SIZE];
 81         fillArray(a, 8080);
 82         makeWeakGlobalRef(a);
 83     }
 84 
 85     private static void testGlobal() {
 86         int[] a = (int[]) readGlobalRef();
 87         checkArray(a, 1337);
 88     }
 89 
 90     private static void testWeakGlobal() {
 91         int[] a = (int[]) readWeakGlobalRef();
 92         if (a != null) {
 93             checkArray(a, 8080);
 94         } else {
 95             // weak reference is cleaned, recreate:
 96             seedWeakGlobalRef();
 97         }
 98     }
 99 
100     private static void fillArray(int[] array, int seed) {
101         Random r = new Random(seed);
102         for (int i = 0; i < ARRAY_SIZE; i++) {
103             array[i] = r.nextInt();
104         }
105     }
106 
107     private static void checkArray(int[] array, int seed) {
108         Random r = new Random(seed);
109         if (array.length != ARRAY_SIZE) {
110             throw new IllegalStateException("Illegal array length: " + array.length + ", but expected " + ARRAY_SIZE);
111         }
112         for (int i = 0; i < ARRAY_SIZE; i++) {
113             int actual = array[i];
114             int expected = r.nextInt();
115             if (actual != expected) {
116                 throw new IllegalStateException("Incorrect array data: " + actual + ", but expected " + expected);
117             }
118         }
119     }
120 }