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comparison agent/src/share/classes/sun/jvm/hotspot/memory/SymbolTable.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
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 }