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annotate agent/src/share/classes/sun/jvm/hotspot/utilities/GenericArray.java @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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1 package sun.jvm.hotspot.utilities;
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2
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3 import java.util.Observable;
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4 import java.util.Observer;
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5
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6 import sun.jvm.hotspot.debugger.Address;
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7 import sun.jvm.hotspot.oops.ArrayKlass;
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8 import sun.jvm.hotspot.oops.CIntField;
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9 import sun.jvm.hotspot.oops.Oop;
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10 import sun.jvm.hotspot.runtime.VM;
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11 import sun.jvm.hotspot.runtime.VMObject;
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12 import sun.jvm.hotspot.types.AddressField;
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13 import sun.jvm.hotspot.types.Type;
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14 import sun.jvm.hotspot.types.TypeDataBase;
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15 import sun.jvm.hotspot.types.WrongTypeException;
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16
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17 /**
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18 * The base class for the mirrors of the Array<T> C++ classes.
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19 */
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20 public abstract class GenericArray extends VMObject {
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21 static {
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22 VM.registerVMInitializedObserver(new Observer() {
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23 public void update(Observable o, Object data) {
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24 initialize(VM.getVM().getTypeDataBase());
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25 }
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26 });
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27 }
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28
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29 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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30 // Array<int> is arbitrarily chosen to get the fields in Array<T>.
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31 Type type = db.lookupType("Array<int>");
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32 lengthField = new CIntField(type.getCIntegerField("_length"), 0);
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33 }
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34
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35 private static long sizeOfArray;
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36 private static CIntField lengthField;
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37
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38 private long dataFieldOffset;
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39
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40 public GenericArray(Address addr, long dataOffset) {
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41 super(addr);
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42 dataFieldOffset = dataOffset;
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43 }
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44
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45 public int length() {
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46 return (int)lengthField.getValue(this);
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47 }
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48
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49 // for compatibility with TypeArray
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50 public int getLength() {
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51 return length();
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52 }
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53
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54 /**
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55 * Gets the element at the given index.
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56 */
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57 protected long getIntegerAt(int index) {
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58 if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index + " " + length());
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59
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60 Type elemType = getElemType();
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61 if (!getElemType().isCIntegerType()) throw new RuntimeException("elemType must be of CInteger type");
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62
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63 Address data = getAddress().addOffsetTo(dataFieldOffset);
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64 long elemSize = elemType.getSize();
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65
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66 return data.getCIntegerAt(index * elemSize, elemSize, false);
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67 }
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68
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69 protected Address getAddressAt(int index) {
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70 if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index);
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71
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72 Type elemType = getElemType();
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73 if (getElemType().isCIntegerType()) throw new RuntimeException("elemType must not be of CInteger type");
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74
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75 Address data = getAddress().addOffsetTo(dataFieldOffset);
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76 long elemSize = elemType.getSize();
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77
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78 return data.getAddressAt(index * elemSize);
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79 }
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80
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81 private long byteSizeof(int length) { return sizeOfArray + length * getElemType().getSize(); }
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82
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83 public long getSize() {
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84 return VM.getVM().alignUp(byteSizeof(length()), VM.getVM().getBytesPerWord()) / VM.getVM().getBytesPerWord();
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85 }
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86
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87 /**
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88 * The element type of this array.
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89 */
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90 public abstract Type getElemType();
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91 }