40         public void update(Observable o, Object data) {
 41           initialize(VM.getVM().getTypeDataBase());
 42         }
 43       });
 44   }
 45 
 46   Array(OopHandle handle, ObjectHeap heap) {
 47     super(handle, heap);
 48   }
 49 
 50   private static void initialize(TypeDataBase db) throws WrongTypeException {
 51     Type type   = db.lookupType("arrayOopDesc");
 52     typeSize    = (int)type.getSize();
 53   }
 54 
 55   // Size of the arrayOopDesc
 56   private static long headerSize=0;
 57   private static long lengthOffsetInBytes=0;
 58   private static long typeSize;
 59 












 60   private static long headerSizeInBytes() {
 61     if (headerSize != 0) {
 62       return headerSize;
 63     }
 64     if (VM.getVM().isCompressedKlassPointersEnabled()) {
 65       headerSize = typeSize;
 66     } else {
 67       headerSize = VM.getVM().alignUp(typeSize + VM.getVM().getIntSize(),
 68                                       VM.getVM().getHeapWordSize());
 69     }
 70     return headerSize;
 71   }
 72 
 73   private static long headerSize(BasicType type) {
 74     if (Universe.elementTypeShouldBeAligned(type)) {
 75        return alignObjectSize(headerSizeInBytes())/VM.getVM().getHeapWordSize();
 76     } else {
 77       return headerSizeInBytes()/VM.getVM().getHeapWordSize();
 78     }
 79   }
 80 
 81   private long lengthOffsetInBytes() {
 82     if (lengthOffsetInBytes != 0) {
 83       return lengthOffsetInBytes;
 84     }
 85     if (VM.getVM().isCompressedKlassPointersEnabled()) {


 86       lengthOffsetInBytes = typeSize - VM.getVM().getIntSize();
 87     } else {
 88       lengthOffsetInBytes = typeSize;
 89     }
 90     return lengthOffsetInBytes;
 91   }
 92 
 93   // Accessors for declared fields
 94   public long getLength() {
 95     boolean isUnsigned = true;
 96     return this.getHandle().getCIntegerAt(lengthOffsetInBytes(), VM.getVM().getIntSize(), isUnsigned);
 97   }
 98 
 99   public long getObjectSize() {
100     ArrayKlass klass = (ArrayKlass) getKlass();
101     // We have to fetch the length of the array, shift (multiply) it
102     // appropriately, up to wordSize, add the header, and align to
103     // object size.
104     long s = getLength() << klass.getLog2ElementSize();
105     s += klass.getArrayHeaderInBytes();
106     s = Oop.alignObjectSize(s);
107     return s;
108   }
109 
110   public static long baseOffsetInBytes(BasicType type) {
111     return headerSize(type) * VM.getVM().getHeapWordSize();






112   }
113 
114   public boolean isArray()             { return true; }
115 
116   public void iterateFields(OopVisitor visitor, boolean doVMFields) {
117     super.iterateFields(visitor, doVMFields);
118   }
119 }

 40         public void update(Observable o, Object data) {
 41           initialize(VM.getVM().getTypeDataBase());
 42         }
 43       });
 44   }
 45 
 46   Array(OopHandle handle, ObjectHeap heap) {
 47     super(handle, heap);
 48   }
 49 
 50   private static void initialize(TypeDataBase db) throws WrongTypeException {
 51     Type type   = db.lookupType("arrayOopDesc");
 52     typeSize    = (int)type.getSize();
 53   }
 54 
 55   // Size of the arrayOopDesc
 56   private static long headerSize=0;
 57   private static long lengthOffsetInBytes=0;
 58   private static long typeSize;
 59 
 60   // Check whether an element of an arrayOop with the given type must be
 61   // aligned 0 mod 8.  The arrayOop itself must be aligned at least this
 62   // strongly.
 63   private static boolean elementTypeShouldBeAligned(BasicType type) {
 64     if (VM.getVM().isLP64()) {
 65       if (type == BasicType.T_OBJECT || type == BasicType.T_ARRAY) {
 66         return !VM.getVM().isCompressedOopsEnabled();
 67       }
 68     }
 69     return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
 70   }
 71 
 72   private static long headerSizeInBytes() {
 73     if (headerSize != 0) {
 74       return headerSize;
 75     }
 76     headerSize = lengthOffsetInBytes() + VM.getVM().getIntSize();





 77     return headerSize;
 78   }
 79 
 80   private static long lengthOffsetInBytes() {








 81     if (lengthOffsetInBytes != 0) {
 82       return lengthOffsetInBytes;
 83     }
 84     if (VM.getVM().isCompactObjectHeadersEnabled()) {
 85       lengthOffsetInBytes = Oop.getHeaderSize();
 86     } else if (VM.getVM().isCompressedKlassPointersEnabled()) {
 87       lengthOffsetInBytes = typeSize - VM.getVM().getIntSize();
 88     } else {
 89       lengthOffsetInBytes = typeSize;
 90     }
 91     return lengthOffsetInBytes;
 92   }
 93 
 94   // Accessors for declared fields
 95   public long getLength() {
 96     boolean isUnsigned = true;
 97     return this.getHandle().getCIntegerAt(lengthOffsetInBytes(), VM.getVM().getIntSize(), isUnsigned);
 98   }
 99 
100   public long getObjectSize() {
101     ArrayKlass klass = (ArrayKlass) getKlass();
102     // We have to fetch the length of the array, shift (multiply) it
103     // appropriately, up to wordSize, add the header, and align to
104     // object size.
105     long s = getLength() << klass.getLog2ElementSize();
106     s += klass.getArrayHeaderInBytes();
107     s = Oop.alignObjectSize(s);
108     return s;
109   }
110 
111   public static long baseOffsetInBytes(BasicType type) {
112     long typeSizeInBytes = headerSizeInBytes();
113     if (elementTypeShouldBeAligned(type)) {
114       VM vm = VM.getVM();
115       return vm.alignUp(typeSizeInBytes, vm.getVM().getHeapWordSize());
116     } else {
117       return typeSizeInBytes;
118     }
119   }
120 
121   public boolean isArray()             { return true; }
122 
123   public void iterateFields(OopVisitor visitor, boolean doVMFields) {
124     super.iterateFields(visitor, doVMFields);
125   }
126 }