| package sun.jvm.hotspot.utilities; |
| |
| import java.util.Observable; |
| import java.util.Observer; |
| |
| import sun.jvm.hotspot.debugger.Address; |
| import sun.jvm.hotspot.oops.ArrayKlass; |
| import sun.jvm.hotspot.oops.CIntField; |
| import sun.jvm.hotspot.oops.Oop; |
| import sun.jvm.hotspot.runtime.VM; |
| import sun.jvm.hotspot.runtime.VMObject; |
| import sun.jvm.hotspot.types.AddressField; |
| import sun.jvm.hotspot.types.Type; |
| import sun.jvm.hotspot.types.TypeDataBase; |
| import sun.jvm.hotspot.types.WrongTypeException; |
| |
| /** |
| * The base class for the mirrors of the Array<T> C++ classes. |
| */ |
| public abstract class GenericArray extends VMObject { |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { |
| // Array<int> is arbitrarily chosen to get the fields in Array<T>. |
| Type type = db.lookupType("Array<int>"); |
| lengthField = new CIntField(type.getCIntegerField("_length"), 0); |
| } |
| |
| private static long sizeOfArray; |
| private static CIntField lengthField; |
| |
| private long dataFieldOffset; |
| |
| public GenericArray(Address addr, long dataOffset) { |
| super(addr); |
| dataFieldOffset = dataOffset; |
| } |
| |
| public int length() { |
| return (int)lengthField.getValue(this); |
| } |
| |
| // for compatibility with TypeArray |
| public int getLength() { |
| return length(); |
| } |
| |
| /** |
| * Gets the element at the given index. |
| */ |
| protected long getIntegerAt(int index) { |
| if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index + " " + length()); |
| |
| Type elemType = getElemType(); |
| if (!getElemType().isCIntegerType()) throw new RuntimeException("elemType must be of CInteger type"); |
| |
| Address data = getAddress().addOffsetTo(dataFieldOffset); |
| long elemSize = elemType.getSize(); |
| |
| return data.getCIntegerAt(index * elemSize, elemSize, false); |
| } |
| |
| protected Address getAddressAt(int index) { |
| if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index); |
| |
| Type elemType = getElemType(); |
| if (getElemType().isCIntegerType()) throw new RuntimeException("elemType must not be of CInteger type"); |
| |
| Address data = getAddress().addOffsetTo(dataFieldOffset); |
| long elemSize = elemType.getSize(); |
| |
| return data.getAddressAt(index * elemSize); |
| } |
| |
| private long byteSizeof(int length) { return sizeOfArray + length * getElemType().getSize(); } |
| |
| public long getSize() { |
| return VM.getVM().alignUp(byteSizeof(length()), VM.getVM().getBytesPerWord()) / VM.getVM().getBytesPerWord(); |
| } |
| |
| /** |
| * The element type of this array. |
| */ |
| public abstract Type getElemType(); |
| } |