13044
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1 /*
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2 * Copyright (c) 2013, 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 * @run main/othervm -XX:+UseG1GC C1ObjectSpillInLogicOp
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29 *
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30 * G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT.
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31 * The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack.
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32 * There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT
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33 * can be spilled just fine, and in that case the xor emission will fail.
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34 */
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35
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36 import java.util.concurrent.atomic.*;
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37 class C1ObjectSpillInLogicOp {
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38 static public void main(String[] args) {
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39 AtomicReferenceArray<Integer> x = new AtomicReferenceArray(128);
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40 Integer y = new Integer(0);
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41 for (int i = 0; i < 50000; i++) {
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42 x.getAndSet(i % x.length(), y);
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43 }
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44 }
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45 }
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