28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 // A Symbol is a canonicalized string.
35 // All Symbols reside in global symbolTable.
36
37 public class Symbol extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("Symbol");
48 length = type.getCIntegerField("_length");
49 baseOffset = type.getField("_body").getOffset();
50 idHash = type.getCIntegerField("_identity_hash");
51 }
52
53 // Format:
54 // [header]
55 // [klass ]
56 // [length] byte size of uft8 string
57 // ..body..
58
59 public static Symbol create(Address addr) {
60 if (addr == null) {
61 return null;
62 }
63 return new Symbol(addr);
64 }
65
66 Symbol(Address addr) {
67 super(addr);
68 }
69
70 public boolean isSymbol() { return true; }
71
72 private static long baseOffset; // tells where the array part starts
73
74 // Fields
75 private static CIntegerField length;
76
77 // Accessors for declared fields
78 public long getLength() { return length.getValue(this.addr); }
79
80 public byte getByteAt(long index) {
81 return addr.getJByteAt(baseOffset + index);
82 }
83 // _identity_hash is a short
84 private static CIntegerField idHash;
85
86 public int identityHash() {
87 long addr_value = getAddress().asLongValue();
88 int addr_bits = (int)(addr_value >> (VM.getVM().getLogMinObjAlignmentInBytes() + 3));
89 int length = (int)getLength();
90 int byte0 = getByteAt(0);
91 int byte1 = getByteAt(1);
92 int id_hash = (int)(0xffff & idHash.getValue(this.addr));
93 return id_hash |
94 ((addr_bits ^ (length << 8) ^ ((byte0 << 8) | byte1)) << 16);
95 }
96
97 public boolean equals(byte[] modUTF8Chars) {
98 int l = (int) getLength();
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28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 // A Symbol is a canonicalized string.
35 // All Symbols reside in global symbolTable.
36
37 public class Symbol extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("Symbol");
48 length = type.getCIntegerField("_length_and_refcount");
49 baseOffset = type.getField("_body").getOffset();
50 idHash = type.getCIntegerField("_identity_hash");
51 }
52
53 // Format:
54 // [header]
55 // [klass ]
56 // [length] byte size of uft8 string
57 // ..body..
58
59 public static Symbol create(Address addr) {
60 if (addr == null) {
61 return null;
62 }
63 return new Symbol(addr);
64 }
65
66 Symbol(Address addr) {
67 super(addr);
68 }
69
70 public boolean isSymbol() { return true; }
71
72 private static long baseOffset; // tells where the array part starts
73
74 // Fields
75 private static CIntegerField length;
76
77 // Accessors for declared fields
78 public long getLength() {
79 long i = length.getValue(this.addr);
80 return (i >> 16) & 0xffff;
81 }
82
83 public byte getByteAt(long index) {
84 return addr.getJByteAt(baseOffset + index);
85 }
86 // _identity_hash is a short
87 private static CIntegerField idHash;
88
89 public int identityHash() {
90 long addr_value = getAddress().asLongValue();
91 int addr_bits = (int)(addr_value >> (VM.getVM().getLogMinObjAlignmentInBytes() + 3));
92 int length = (int)getLength();
93 int byte0 = getByteAt(0);
94 int byte1 = getByteAt(1);
95 int id_hash = (int)(0xffff & idHash.getValue(this.addr));
96 return id_hash |
97 ((addr_bits ^ (length << 8) ^ ((byte0 << 8) | byte1)) << 16);
98 }
99
100 public boolean equals(byte[] modUTF8Chars) {
101 int l = (int) getLength();
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