1 /* 2 * Copyright (c) 2022, 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 id=default 26 * @library /test/lib 27 * @modules java.base/jdk.internal.misc 28 * java.management 29 * @run main/othervm BaseOffsets 30 */ 31 /* 32 * @test id=no-coops 33 * @library /test/lib 34 * @requires vm.bits == "64" 35 * @modules java.base/jdk.internal.misc 36 * java.management 37 * @run main/othervm -XX:-UseCompressedOops BaseOffsets 38 */ 39 40 import java.lang.reflect.Field; 41 import java.util.Arrays; 42 import java.util.Comparator; 43 import jdk.internal.misc.Unsafe; 44 45 import jdk.test.lib.Asserts; 46 import jdk.test.lib.Platform; 47 48 public class BaseOffsets { 49 50 static class LIClass { 51 public int i; 52 } 53 54 // @0: 8 byte header, @8: int field 55 static final long INT_OFFSET = 8L; 56 57 static public void main(String[] args) { 58 Unsafe unsafe = Unsafe.getUnsafe(); 59 Class c = LIClass.class; 60 Field[] fields = c.getFields(); 61 for (int i = 0; i < fields.length; i++) { 62 long offset = unsafe.objectFieldOffset(fields[i]); 63 if (fields[i].getType() == int.class) { 64 Asserts.assertEquals(offset, INT_OFFSET, "Misplaced int field"); 65 } else { 66 Asserts.fail("Unexpected field type"); 67 } 68 } 69 70 Asserts.assertEquals(unsafe.arrayBaseOffset(boolean[].class), 12, "Misplaced boolean array base"); 71 Asserts.assertEquals(unsafe.arrayBaseOffset(byte[].class), 12, "Misplaced byte array base"); 72 Asserts.assertEquals(unsafe.arrayBaseOffset(char[].class), 12, "Misplaced char array base"); 73 Asserts.assertEquals(unsafe.arrayBaseOffset(short[].class), 12, "Misplaced short array base"); 74 Asserts.assertEquals(unsafe.arrayBaseOffset(int[].class), 12, "Misplaced int array base"); 75 Asserts.assertEquals(unsafe.arrayBaseOffset(long[].class), 16, "Misplaced long array base"); 76 Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class), 12, "Misplaced float array base"); 77 Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class), 16, "Misplaced double array base"); 78 boolean narrowOops = System.getProperty("java.vm.compressedOopsMode") != null || 79 !Platform.is64bit(); 80 int expected_objary_offset = narrowOops ? 12 : 16; 81 Asserts.assertEquals(unsafe.arrayBaseOffset(Object[].class), expected_objary_offset, "Misplaced object array base"); 82 } 83 }