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1 /* |
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2 * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @bug 8027751 |
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27 * @summary C1 crashes generating G1 post-barrier in Unsafe.getAndSetObject() intrinsic because of the new value spill |
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28 * @requires vm.gc.G1 |
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29 * |
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30 * @run main/othervm -XX:+UseG1GC compiler.regalloc.C1ObjectSpillInLogicOp |
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31 */ |
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32 |
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33 package compiler.regalloc; |
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34 |
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35 import java.util.concurrent.atomic.AtomicReferenceArray; |
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36 |
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37 /* |
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38 * G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT. |
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39 * The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack. |
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40 * There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT |
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41 * can be spilled just fine, and in that case the xor emission will fail. |
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42 */ |
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43 public class C1ObjectSpillInLogicOp { |
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44 public static void main(String[] args) { |
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45 AtomicReferenceArray<Integer> x = new AtomicReferenceArray(128); |
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46 Integer y = new Integer(0); |
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47 for (int i = 0; i < 50000; i++) { |
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48 x.getAndSet(i % x.length(), y); |
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49 } |
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50 } |
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51 } |