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.getJShortField("_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 84 private static JShortField idHash; 85 86 public short identityHash() { return (short)idHash.getValue(this.addr); } 87 88 public boolean equals(byte[] modUTF8Chars) { 89 int l = (int) getLength(); 90 if (l != modUTF8Chars.length) return false; 91 while (l-- > 0) { 92 if (modUTF8Chars[l] != getByteAt(l)) return false; 93 } 94 if (Assert.ASSERTS_ENABLED) { 95 Assert.that(l == -1, "we should be at the beginning"); 96 } 97 return true; 98 } 99 100 public byte[] asByteArray() { 101 int length = (int) getLength(); 102 byte [] result = new byte [length]; 103 for (int index = 0; index < length; index++) { 104 result[index] = getByteAt(index); 105 } 106 return result; | 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 84 private static CIntegerField idHash; 85 86 public int identityHash() { return (int)idHash.getValue(this.addr); } 87 88 public boolean equals(byte[] modUTF8Chars) { 89 int l = (int) getLength(); 90 if (l != modUTF8Chars.length) return false; 91 while (l-- > 0) { 92 if (modUTF8Chars[l] != getByteAt(l)) return false; 93 } 94 if (Assert.ASSERTS_ENABLED) { 95 Assert.that(l == -1, "we should be at the beginning"); 96 } 97 return true; 98 } 99 100 public byte[] asByteArray() { 101 int length = (int) getLength(); 102 byte [] result = new byte [length]; 103 for (int index = 0; index < length; index++) { 104 result[index] = getByteAt(index); 105 } 106 return result; |