1 /* 2 * Copyright (c) 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 8080699 27 * @summary eliminated arraycopy node still reachable through exception edges 28 * 29 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation 30 * compiler.arraycopy.TestDeadArrayCopyOnMemChain 31 */ 32 33 package compiler.arraycopy; 34 35 public class TestDeadArrayCopyOnMemChain { 36 static class A { 37 int f; 38 } 39 40 static void test_helper(Object o) { 41 } 42 43 static void test(int src_off, boolean flag) { 44 // dst is eliminated first. Eliminating dst causes src to be 45 // eliminated. When working on the safepoint at the uncommon 46 // trap in the exception handler, the eliminated ArrayCopyNode 47 // is reached through the exception edges. 48 Object[] dst = new Object[10]; 49 Object[] src = new Object[10]; 50 51 // src_off causes the exception handler to be run sometimes 52 try { 53 System.arraycopy(src, src_off, dst, 0, 10); 54 } catch (IndexOutOfBoundsException ioobe) { 55 // flag always false so test becomes uncommon trap. Make 56 // sure src is live at the unc. 57 if (flag) { 58 test_helper(src); 59 } 60 } 61 } 62 63 static public void main(String[] args) { 64 for (int i = 0; i < 20000; i++) { 65 test((i%2) == 0 ? 0 : -1, false); 66 } 67 } 68 }