1 /* 2 * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 /** 26 * @test 27 * @bug 6968348 28 * @summary Byteswapped memory access can point to wrong location after JIT 29 * @modules java.base/jdk.internal.misc 30 * 31 * @run main compiler.c2.Test6968348 32 */ 33 34 package compiler.c2; 35 36 import jdk.internal.misc.Unsafe; 37 38 import java.lang.reflect.Field; 39 40 public class Test6968348 { 41 static Unsafe unsafe; 42 static final long[] buffer = new long[4096]; 43 static int array_long_base_offset; 44 45 public static void main(String[] args) throws Exception { 46 Class c = Test6968348.class.getClassLoader().loadClass("jdk.internal.misc.Unsafe"); 47 Field f = c.getDeclaredField("theUnsafe"); 48 f.setAccessible(true); 49 unsafe = (Unsafe)f.get(c); 50 array_long_base_offset = unsafe.arrayBaseOffset(long[].class); 51 52 for (int n = 0; n < 100000; n++) { 53 test(); 54 } 55 } 56 57 public static void test() { 58 for (long i = array_long_base_offset; i < 4096; i += 8) { 59 unsafe.putLong(buffer, i, Long.reverseBytes(i)); 60 } 61 } 62 } | 1 /* 2 * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 /** 26 * @test 27 * @bug 6968348 28 * @summary Byteswapped memory access can point to wrong location after JIT 29 * @modules java.base/jdk.internal.misc 30 * 31 * @run main compiler.c2.Test6968348 32 */ 33 34 package compiler.c2; 35 36 import jdk.internal.misc.Unsafe; 37 38 import java.lang.reflect.Field; 39 40 public class Test6968348 { 41 static Unsafe unsafe = Unsafe.getUnsafe(); 42 static final long[] buffer = new long[4096]; 43 static int array_long_base_offset; 44 45 public static void main(String[] args) throws Exception { 46 array_long_base_offset = unsafe.arrayBaseOffset(long[].class); 47 48 for (int n = 0; n < 100000; n++) { 49 test(); 50 } 51 } 52 53 public static void test() { 54 for (long i = array_long_base_offset; i < 4096; i += 8) { 55 unsafe.putLong(buffer, i, Long.reverseBytes(i)); 56 } 57 } 58 } |