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8283408: Fix a C2 crash when filling arrays with unsafe
Backport-of: a6740c010b7d37f991c8547be6ea72b198e9094f
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test/hotspot/jtreg/compiler/loopopts/FillArrayWithUnsafe.java
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/* | ||
* Copyright (c) 2022, Arm Limited. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
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/** | ||
* @test | ||
* @bug 8283408 | ||
* @summary Fill a byte array with Java Unsafe API | ||
* @run main/othervm -XX:+OptimizeFill compiler.loopopts.FillArrayWithUnsafe | ||
*/ | ||
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package compiler.loopopts; | ||
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import java.lang.reflect.Field; | ||
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import sun.misc.Unsafe; | ||
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public class FillArrayWithUnsafe { | ||
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private static Unsafe unsafe; | ||
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public static void main(String[] args) throws Exception { | ||
Class klass = Unsafe.class; | ||
Field field = klass.getDeclaredField("theUnsafe"); | ||
field.setAccessible(true); | ||
unsafe = (Unsafe) field.get(null); | ||
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byte[] buffer; | ||
// Make sure method newByteArray is compiled by C2 | ||
for (int i = 0; i < 50000; i++) { | ||
buffer = newByteArray(100, (byte) 0x80); | ||
} | ||
} | ||
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public static byte[] newByteArray(int size, byte val) { | ||
byte[] arr = new byte[size]; | ||
int offset = unsafe.arrayBaseOffset(byte[].class); | ||
for (int i = offset; i < offset + size; i++) { | ||
unsafe.putByte(arr, i, val); | ||
} | ||
return arr; | ||
} | ||
} | ||
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