1 /* 2 * Copyright 2000-2008 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 typeSize = (int)type.getSize(); 51 } 52 53 // Size of the arrayOopDesc 54 private static long headerSize=0; 55 private static long lengthOffsetInBytes=0; 56 private static long typeSize; 57 58 private static long headerSizeInBytes() { 59 if (headerSize != 0) { 60 return headerSize; 61 } 62 if (VM.getVM().isCompressedOopsEnabled()) { 63 headerSize = typeSize; 64 } else { 65 headerSize = VM.getVM().alignUp(typeSize + VM.getVM().getIntSize(), 66 VM.getVM().getHeapWordSize()); 67 } 68 return headerSize; 69 } 70 71 private static long headerSize(BasicType type) { 72 if (Universe.elementTypeShouldBeAligned(type)) { 73 return alignObjectSize(headerSizeInBytes())/VM.getVM().getHeapWordSize(); 74 } else { 75 return headerSizeInBytes()/VM.getVM().getHeapWordSize(); 76 } 77 } 78 79 private long lengthOffsetInBytes() { 80 if (lengthOffsetInBytes != 0) { 81 return lengthOffsetInBytes; 82 } 83 if (VM.getVM().isCompressedOopsEnabled()) { 84 lengthOffsetInBytes = typeSize - VM.getVM().getIntSize(); 85 } else { 86 lengthOffsetInBytes = typeSize; 87 } 88 return lengthOffsetInBytes; 89 } 90 91 // Accessors for declared fields 92 public long getLength() { 93 boolean isUnsigned = true; 94 return this.getHandle().getCIntegerAt(lengthOffsetInBytes(), VM.getVM().getIntSize(), isUnsigned); 95 } 96 97 public long getObjectSize() { 98 ArrayKlass klass = (ArrayKlass) getKlass(); 99 // We have to fetch the length of the array, shift (multiply) it 100 // appropriately, up to wordSize, add the header, and align to 101 // object size. 102 long s = getLength() << klass.getLog2ElementSize(); 103 s += klass.getArrayHeaderInBytes(); 104 s = Oop.alignObjectSize(s); 105 return s; 106 } 107 108 public static long baseOffsetInBytes(BasicType type) { 109 return headerSize(type) * VM.getVM().getHeapWordSize(); 110 } 111 112 public boolean isArray() { return true; } 113 114 public void iterateFields(OopVisitor visitor, boolean doVMFields) { 115 super.iterateFields(visitor, doVMFields); 116 } 117 }