Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/memory/SymbolTable.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.memory; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.oops.*; | |
31 import sun.jvm.hotspot.types.*; | |
32 import sun.jvm.hotspot.runtime.*; | |
33 import sun.jvm.hotspot.utilities.*; | |
34 | |
35 public class SymbolTable extends sun.jvm.hotspot.utilities.Hashtable { | |
36 static { | |
37 VM.registerVMInitializedObserver(new Observer() { | |
38 public void update(Observable o, Object data) { | |
39 initialize(VM.getVM().getTypeDataBase()); | |
40 } | |
41 }); | |
42 } | |
43 | |
44 private static synchronized void initialize(TypeDataBase db) { | |
45 Type type = db.lookupType("SymbolTable"); | |
46 theTableField = type.getAddressField("_the_table"); | |
47 symbolTableSize = db.lookupIntConstant("SymbolTable::symbol_table_size").intValue(); | |
48 } | |
49 | |
50 // Fields | |
51 private static AddressField theTableField; | |
52 private static int symbolTableSize; | |
53 | |
54 // Accessors | |
55 public static SymbolTable getTheTable() { | |
56 Address tmp = theTableField.getValue(); | |
57 return (SymbolTable) VMObjectFactory.newObject(SymbolTable.class, tmp); | |
58 } | |
59 | |
60 public static int getSymbolTableSize() { | |
61 return symbolTableSize; | |
62 } | |
63 | |
64 public SymbolTable(Address addr) { | |
65 super(addr); | |
66 } | |
67 | |
68 /** Clone of VM's "temporary" probe routine, as the SA currently | |
69 does not support mutation so lookup() would have no effect | |
70 anyway. Returns null if the given string is not in the symbol | |
71 table. */ | |
72 public Symbol probe(String name) { | |
73 try { | |
74 return probe(toModifiedUTF8Bytes(name)); | |
75 } catch (IOException e) { | |
76 return null; | |
77 } | |
78 } | |
79 | |
80 /** Clone of VM's "temporary" probe routine, as the SA currently | |
81 does not support mutation so lookup() would have no effect | |
82 anyway. Returns null if the given string is not in the symbol | |
83 table. */ | |
84 public Symbol probe(byte[] name) { | |
85 long hashValue = hashSymbol(name); | |
86 for (HashtableEntry e = (HashtableEntry) bucket(hashToIndex(hashValue)); e != null; e = (HashtableEntry) e.next()) { | |
87 if (e.hash() == hashValue) { | |
88 Symbol sym = (Symbol) e.literal(); | |
89 if (sym.equals(name)) { | |
90 return sym; | |
91 } | |
92 } | |
93 } | |
94 return null; | |
95 } | |
96 | |
97 public interface SymbolVisitor { | |
98 public void visit(Symbol sym); | |
99 } | |
100 | |
101 public void symbolsDo(SymbolVisitor visitor) { | |
102 int numBuckets = tableSize(); | |
103 for (int i = 0; i < numBuckets; i++) { | |
104 for (HashtableEntry e = (HashtableEntry) bucket(i); e != null; | |
105 e = (HashtableEntry) e.next()) { | |
106 visitor.visit((Symbol) e.literal()); | |
107 } | |
108 } | |
109 } | |
110 | |
111 private static byte[] toModifiedUTF8Bytes(String name) throws IOException { | |
112 ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
113 DataOutputStream dos = new DataOutputStream(baos); | |
114 dos.writeUTF(name); | |
115 dos.flush(); | |
116 byte[] buf = baos.toByteArray(); | |
117 byte[] res = new byte[buf.length - 2]; | |
118 // skip the length part | |
119 System.arraycopy(buf, 2, res, 0, res.length); | |
120 return res; | |
121 } | |
122 } |