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1 /*
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2 * Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.oops;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.memory.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32
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33 // Array is an abstract superclass for TypeArray and ObjArray
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34
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35 public class Array extends Oop {
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36 static {
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37 VM.registerVMInitializedObserver(new Observer() {
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38 public void update(Observable o, Object data) {
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39 initialize(VM.getVM().getTypeDataBase());
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40 }
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41 });
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42 }
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43
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44 Array(OopHandle handle, ObjectHeap heap) {
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45 super(handle, heap);
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46 }
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47
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48 private static void initialize(TypeDataBase db) throws WrongTypeException {
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49 Type type = db.lookupType("arrayOopDesc");
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50 length = new CIntField(type.getCIntegerField("_length"), 0);
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51 headerSize = type.getSize();
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52 }
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53
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54 // Size of the arrayOopDesc
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55 private static long headerSize;
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56
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57 // Fields
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58 private static CIntField length;
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59
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60 // Accessors for declared fields
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61 public long getLength() { return length.getValue(this); }
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62
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63 public long getObjectSize() {
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64 ArrayKlass klass = (ArrayKlass) getKlass();
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65 // We have to fetch the length of the array, shift (multiply) it
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66 // appropriately, up to wordSize, add the header, and align to
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67 // object size.
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68 long s = getLength() << klass.getLog2ElementSize();
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69 s += klass.getArrayHeaderInBytes();
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70 s = Oop.alignObjectSize(s);
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71 return s;
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72 }
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73
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74 public static long baseOffsetInBytes(BasicType type) {
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75 if (Universe.elementTypeShouldBeAligned(type)) {
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76 return (VM.getVM().isLP64()) ? alignObjectSize(headerSize)
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77 : VM.getVM().alignUp(headerSize, 8);
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78 } else {
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79 return headerSize;
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80 }
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81 }
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82
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83 public boolean isArray() { return true; }
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84
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85 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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86 super.iterateFields(visitor, doVMFields);
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87 if (doVMFields) {
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88 visitor.doCInt(length, true);
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89 }
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90 }
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91 }
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