1 /* 2 * Copyright (c) 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 import java.util.concurrent.*; 25 26 /* 27 * @test TestArrayCopyStress 28 * @key gc 29 * @requires vm.gc.Shenandoah 30 * 31 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:TieredStopAtLevel=0 -Xmx16m TestArrayCopyStress 32 */ 33 public class TestArrayCopyStress { 34 35 private static final int ARRAY_SIZE = 1000; 36 private static final int ITERATIONS = 10000; 37 38 static class Foo { 39 int num; 40 41 Foo(int num) { 42 this.num = num; 43 } 44 } 45 46 static class Bar {} 47 48 public static void main(String[] args) throws Exception { 49 for (int i = 0; i < ITERATIONS; i++) { 50 testConjoint(); 51 } 52 } 53 54 private static void testConjoint() { 55 Foo[] array = new Foo[ARRAY_SIZE]; 56 for (int i = 0; i < ARRAY_SIZE; i++) { 57 array[i] = new Foo(i); 58 } 59 60 int src_idx = ThreadLocalRandom.current().nextInt(0, ARRAY_SIZE); 61 int dst_idx = ThreadLocalRandom.current().nextInt(0, ARRAY_SIZE); 62 int len = ThreadLocalRandom.current().nextInt(0, Math.min(ARRAY_SIZE - src_idx, ARRAY_SIZE - dst_idx)); 63 System.arraycopy(array, src_idx, array, dst_idx, len); 64 65 for (int i = 0; i < ARRAY_SIZE; i++) { 66 if (i >= dst_idx && i < dst_idx + len) { 67 assertEquals(array[i].num, i - (dst_idx - src_idx)); 68 } else { 69 assertEquals(array[i].num, i); 70 } 71 } 72 } 73 74 private static void assertEquals(int a, int b) { 75 if (a != b) throw new RuntimeException("assert failed"); 76 } 77 78 }