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comparison 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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6724:36d1d483d5d6 6725:da91efe96a93
1 package sun.jvm.hotspot.utilities;
2
3 import java.util.Observable;
4 import java.util.Observer;
5
6 import sun.jvm.hotspot.debugger.Address;
7 import sun.jvm.hotspot.oops.ArrayKlass;
8 import sun.jvm.hotspot.oops.CIntField;
9 import sun.jvm.hotspot.oops.Oop;
10 import sun.jvm.hotspot.runtime.VM;
11 import sun.jvm.hotspot.runtime.VMObject;
12 import sun.jvm.hotspot.types.AddressField;
13 import sun.jvm.hotspot.types.Type;
14 import sun.jvm.hotspot.types.TypeDataBase;
15 import sun.jvm.hotspot.types.WrongTypeException;
16
17 /**
18 * The base class for the mirrors of the Array<T> C++ classes.
19 */
20 public abstract class GenericArray extends VMObject {
21 static {
22 VM.registerVMInitializedObserver(new Observer() {
23 public void update(Observable o, Object data) {
24 initialize(VM.getVM().getTypeDataBase());
25 }
26 });
27 }
28
29 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
30 // Array<int> is arbitrarily chosen to get the fields in Array<T>.
31 Type type = db.lookupType("Array<int>");
32 lengthField = new CIntField(type.getCIntegerField("_length"), 0);
33 }
34
35 private static long sizeOfArray;
36 private static CIntField lengthField;
37
38 private long dataFieldOffset;
39
40 public GenericArray(Address addr, long dataOffset) {
41 super(addr);
42 dataFieldOffset = dataOffset;
43 }
44
45 public int length() {
46 return (int)lengthField.getValue(this);
47 }
48
49 // for compatibility with TypeArray
50 public int getLength() {
51 return length();
52 }
53
54 /**
55 * Gets the element at the given index.
56 */
57 protected long getIntegerAt(int index) {
58 if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index + " " + length());
59
60 Type elemType = getElemType();
61 if (!getElemType().isCIntegerType()) throw new RuntimeException("elemType must be of CInteger type");
62
63 Address data = getAddress().addOffsetTo(dataFieldOffset);
64 long elemSize = elemType.getSize();
65
66 return data.getCIntegerAt(index * elemSize, elemSize, false);
67 }
68
69 protected Address getAddressAt(int index) {
70 if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index);
71
72 Type elemType = getElemType();
73 if (getElemType().isCIntegerType()) throw new RuntimeException("elemType must not be of CInteger type");
74
75 Address data = getAddress().addOffsetTo(dataFieldOffset);
76 long elemSize = elemType.getSize();
77
78 return data.getAddressAt(index * elemSize);
79 }
80
81 private long byteSizeof(int length) { return sizeOfArray + length * getElemType().getSize(); }
82
83 public long getSize() {
84 return VM.getVM().alignUp(byteSizeof(length()), VM.getVM().getBytesPerWord()) / VM.getVM().getBytesPerWord();
85 }
86
87 /**
88 * The element type of this array.
89 */
90 public abstract Type getElemType();
91 }