1 /* 2 * Copyright (c) 2015, 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 * @test 26 * @library /test/lib 27 * @modules java.base/jdk.internal.misc 28 * java.management 29 * @compile -XDenableValueTypes -XDallowFlattenabilityModifiers GetPutInt.java 30 * @run main/othervm -XX:+EnableValhalla GetPutInt 31 */ 32 33 import java.lang.reflect.Field; 34 import jdk.internal.misc.Unsafe; 35 import static jdk.test.lib.Asserts.*; 36 37 public class GetPutInt { 38 public static void main(String args[]) throws Exception { 39 Unsafe unsafe = Unsafe.getUnsafe(); 40 Test t = new Test(); 41 Field field = Test.class.getField("i"); 42 43 long offset = unsafe.objectFieldOffset(field); 44 assertEquals(-1, unsafe.getInt(t, offset)); 45 unsafe.putInt(t, offset, 0); 46 assertEquals(0, unsafe.getInt(t, offset)); 47 48 long address = unsafe.allocateMemory(8); 49 unsafe.putInt(address, 1); 50 assertEquals(1, unsafe.getInt(address)); 51 unsafe.freeMemory(address); 52 53 int arrayInt[] = { -1, 0, 1, 2 }; 54 int scale = unsafe.arrayIndexScale(arrayInt.getClass()); 55 offset = unsafe.arrayBaseOffset(arrayInt.getClass()); 56 for (int i = 0; i < arrayInt.length; i++) { 57 assertEquals(unsafe.getInt(arrayInt, offset), arrayInt[i]); 58 offset += scale; 59 } 60 61 Point p = Point.createPoint(5, 3); 62 boolean exceptionThrown = false; 63 64 Field xField = Point.class.getField("x"); 65 long offset2 = unsafe.objectFieldOffset(xField); 66 67 try { 68 unsafe.putInt(p, offset2, 8); 69 } catch(IllegalAccessError e) { 70 exceptionThrown = true; 71 } 72 assertTrue(exceptionThrown, "IAE not thrown when writing to a value instance field"); 73 } 74 75 static class Test { 76 public int i = -1; 77 } 78 79 static __ByValue final class Point { 80 public final int x; 81 public final int y; 82 83 private Point() { 84 x = 0; 85 y = 0; 86 } 87 88 public static Point createPoint(int x, int y) { 89 Point p = __MakeDefault Point(); 90 p = __WithField(p.x, x); 91 p = __WithField(p.y, y); 92 return p; 93 } 94 } 95 }