1 /* 2 * Copyright (c) 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 * @test 26 * @summary Verify behaviour of Unsafe.get/putChar 27 * @library /testlibrary 28 * @modules java.base/jdk.internal.misc 29 * java.management 30 * @run main GetPutChar 31 */ 32 33 import java.lang.reflect.Field; 34 import jdk.test.lib.*; 35 import jdk.internal.misc.Unsafe; 36 import static jdk.test.lib.Asserts.*; 37 38 public class GetPutChar { 39 public static void main(String args[]) throws Exception { 40 Unsafe unsafe = Utils.getUnsafe(); 41 Test t = new Test(); 42 Field field = Test.class.getField("c"); 43 44 long offset = unsafe.objectFieldOffset(field); 45 assertEquals('\u0000', unsafe.getChar(t, offset)); 46 unsafe.putChar(t, offset, '\u0001'); 47 assertEquals('\u0001', unsafe.getChar(t, offset)); 48 49 long address = unsafe.allocateMemory(8); 50 unsafe.putChar(address, '\u0002'); 51 assertEquals('\u0002', unsafe.getChar(address)); 52 unsafe.freeMemory(address); 53 54 char arrayChar[] = { '\uabcd', '\u00ff', '\uff00', }; 55 int scale = unsafe.arrayIndexScale(arrayChar.getClass()); 56 offset = unsafe.arrayBaseOffset(arrayChar.getClass()); 57 for (int i = 0; i < arrayChar.length; i++) { 58 assertEquals(unsafe.getChar(arrayChar, offset), arrayChar[i]); 59 offset += scale; 60 } 61 } 62 63 static class Test { 64 public char c = '\u0000'; 65 } 66 }