1 /* 2 * Copyright 2000-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.oops; 26 27 import java.util.*; 28 import sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.memory.*; 30 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.types.*; 32 33 // Array is an abstract superclass for TypeArray and ObjArray 34 35 public class Array extends Oop { 36 static { 37 VM.registerVMInitializedObserver(new Observer() { 38 public void update(Observable o, Object data) { 39 initialize(VM.getVM().getTypeDataBase()); 40 } 41 }); 42 } 43 44 Array(OopHandle handle, ObjectHeap heap) { 45 super(handle, heap); 46 } 47 48 private static void initialize(TypeDataBase db) throws WrongTypeException { 49 Type type = db.lookupType("arrayOopDesc"); 50 length = new CIntField(type.getCIntegerField("_length"), 0); 51 headerSize = type.getSize(); 52 } 53 54 // Size of the arrayOopDesc 55 private static long headerSize; 56 57 // Fields 58 private static CIntField length; 59 60 // Accessors for declared fields 61 public long getLength() { return length.getValue(this); } 62 63 public long getObjectSize() { 64 ArrayKlass klass = (ArrayKlass) getKlass(); 65 // We have to fetch the length of the array, shift (multiply) it 66 // appropriately, up to wordSize, add the header, and align to 67 // object size. 68 long s = getLength() << klass.getLog2ElementSize(); 69 s += klass.getArrayHeaderInBytes(); 70 s = Oop.alignObjectSize(s); 71 return s; 72 } 73 74 public static long baseOffsetInBytes(BasicType type) { 75 if (Universe.elementTypeShouldBeAligned(type)) { 76 return (VM.getVM().isLP64()) ? alignObjectSize(headerSize) 77 : VM.getVM().alignUp(headerSize, 8); 78 } else { 79 return headerSize; 80 } 81 } 82 83 public boolean isArray() { return true; } 84 85 public void iterateFields(OopVisitor visitor, boolean doVMFields) { 86 super.iterateFields(visitor, doVMFields); 87 if (doVMFields) { 88 visitor.doCInt(length, true); 89 } 90 } 91 }