70d5cac961
Some CPUs (like ARM32) does not support unaligned memory accesses. To avoid JVM crashes tests that perform such accesses should be skipped on corresponding platforms. Reviewed-by: iignatyev, clanger
127 lines
4.5 KiB
Java
127 lines
4.5 KiB
Java
/*
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* Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8202414
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* @summary Unsafe write after primitive array creation may result in array length change
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* @modules java.base/jdk.internal.misc
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* @library /test/lib
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* @run main/othervm compiler.c2.Test8202414
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*/
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package compiler.c2;
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import sun.misc.Unsafe;
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import java.lang.reflect.Field;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import jtreg.SkippedException;
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public class Test8202414 {
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public static void main(String[] args) {
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// Some CPUs (for example, ARM) does not support unaligned
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// memory accesses. This test may cause JVM crash due to
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// alignment check failure on such CPUs.
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if (!jdk.internal.misc.Unsafe.getUnsafe().unalignedAccess()) {
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throw new SkippedException(
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"Platform is missing unaligned memory accesses support.");
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}
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System.err.close();
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int count = 0;
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while (count++ < 120000) {
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test();
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}
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}
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public static void test() {
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byte[] newBufb = serByte(397);
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short[] newBufs = serShort(397);
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int[] newBufi = serInt(397);
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long[] newBufl = serLong(397);
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if (newBufb.length != 397 || newBufs.length != 397
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|| newBufi.length != 397 || newBufl.length != 397) {
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System.out.println("array length internal error");
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throw new RuntimeException("Test failed");
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}
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}
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public static byte[] serByte(int bufLen) {
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byte[] buf = new byte[bufLen];
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THE_UNSAFE.putByte(buf, BYTE_ARRAY_BASE_OFFSET + 1, (byte) buf.length);
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System.err.println("ref " + buf);
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return buf;
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}
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public static short[] serShort(int bufLen) {
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short[] buf = new short[bufLen];
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THE_UNSAFE.putShort(buf, SHORT_ARRAY_BASE_OFFSET + 1, (short) buf.length);
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System.err.println("ref " + buf);
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return buf;
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}
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public static int[] serInt(int bufLen) {
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int[] buf = new int[bufLen];
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THE_UNSAFE.putInt(buf, INT_ARRAY_BASE_OFFSET + 1, buf.length);
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System.err.println("ref " + buf);
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return buf;
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}
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public static long[] serLong(int bufLen) {
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long[] buf = new long[bufLen];
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THE_UNSAFE.putLong(buf, LONG_ARRAY_BASE_OFFSET + 1, buf.length);
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System.err.println("ref " + buf);
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return buf;
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}
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/* Unsafe fields and initialization
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*/
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static final Unsafe THE_UNSAFE;
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static final long BYTE_ARRAY_BASE_OFFSET;
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static final long SHORT_ARRAY_BASE_OFFSET;
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static final long INT_ARRAY_BASE_OFFSET;
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static final long LONG_ARRAY_BASE_OFFSET;
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static {
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THE_UNSAFE = (Unsafe) AccessController.doPrivileged (
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new PrivilegedAction<Object>() {
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@Override
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public Object run() {
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try {
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Field f = Unsafe.class.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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return f.get(null);
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} catch (NoSuchFieldException | IllegalAccessException e) {
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throw new Error();
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}
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}
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}
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);
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BYTE_ARRAY_BASE_OFFSET = THE_UNSAFE.arrayBaseOffset(byte[].class);
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SHORT_ARRAY_BASE_OFFSET = THE_UNSAFE.arrayBaseOffset(short[].class);
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INT_ARRAY_BASE_OFFSET = THE_UNSAFE.arrayBaseOffset(int[].class);
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LONG_ARRAY_BASE_OFFSET = THE_UNSAFE.arrayBaseOffset(long[].class);
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}
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}
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