1 /* 2 * Copyright (c) 2013, 2016, 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 8027751 27 * @requires vm.gc.G1 28 * @summary C1 crashes generating G1 post-barrier in Unsafe.getAndSetObject() intrinsic because of the new value spill 29 * @run main/othervm -XX:+UseG1GC C1ObjectSpillInLogicOp 30 * 31 * G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT. 32 * The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack. 33 * There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT 34 * can be spilled just fine, and in that case the xor emission will fail. 35 */ 36 37 import java.util.concurrent.atomic.*; 38 39 public class C1ObjectSpillInLogicOp { 40 public static void main(String[] args) { 41 AtomicReferenceArray<Integer> x = new AtomicReferenceArray(128); 42 Integer y = new Integer(0); 43 for (int i = 0; i < 50000; i++) { 44 x.getAndSet(i % x.length(), y); 45 } 46 } 47 }