94 lines
3.2 KiB
Java
94 lines
3.2 KiB
Java
/*
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* Copyright (c) 2019, Red Hat, Inc. 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 8216549
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* @summary Mismatched unsafe access to non escaping object fails
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*
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* @modules java.base/jdk.internal.misc
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* @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation MismatchedUnsafeLoadFromNewObject
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*/
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import java.lang.reflect.Field;
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import jdk.internal.misc.Unsafe;
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public class MismatchedUnsafeLoadFromNewObject {
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public volatile int f_int = -1;
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public volatile int f_int2 = -1;
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public static Unsafe unsafe = Unsafe.getUnsafe();
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public static final long f_int_off;
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public static final long f_int2_off;
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static {
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Field f_int_field = null;
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Field f_int2_field = null;
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try {
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f_int_field = MismatchedUnsafeLoadFromNewObject.class.getField("f_int");
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f_int2_field = MismatchedUnsafeLoadFromNewObject.class.getField("f_int2");
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} catch (Exception e) {
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System.out.println("reflection failed " + e);
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e.printStackTrace();
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}
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f_int_off = unsafe.objectFieldOffset(f_int_field);
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f_int2_off = unsafe.objectFieldOffset(f_int2_field);
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}
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static public void main(String[] args) {
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for (int i = 0; i < 20_000; i++) {
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byte res = test1();
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if (res != -1) {
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throw new RuntimeException("Incorrect result: " + res);
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}
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res = test2();
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if (res != -1) {
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throw new RuntimeException("Incorrect result: " + res);
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}
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int res2 = test3();
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if (res2 != -1) {
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throw new RuntimeException("Incorrect result: " + res2);
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}
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}
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}
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static byte test1() {
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MismatchedUnsafeLoadFromNewObject t = new MismatchedUnsafeLoadFromNewObject();
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return unsafe.getByte(t, f_int_off);
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}
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static byte test2() {
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MismatchedUnsafeLoadFromNewObject t = new MismatchedUnsafeLoadFromNewObject();
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return unsafe.getByte(t, f_int_off+1);
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}
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static int test3() {
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MismatchedUnsafeLoadFromNewObject t = new MismatchedUnsafeLoadFromNewObject();
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if (f_int_off < f_int2_off) {
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return unsafe.getIntUnaligned(t, f_int_off+1);
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} else {
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return unsafe.getIntUnaligned(t, f_int2_off+1);
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}
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}
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}
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