Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/memory/SymbolTable.java @ 12825:c90e76575b03
8019375: Internal symbol table size should be tunable.
Reviewed-by: coleenp, kamg
author | kevinw |
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date | Tue, 08 Oct 2013 09:33:51 +0100 |
parents | 1d1603768966 |
children | de6a9e811145 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 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 } | |
48 | |
49 // Fields | |
50 private static AddressField theTableField; | |
51 | |
52 // Accessors | |
53 public static SymbolTable getTheTable() { | |
54 Address tmp = theTableField.getValue(); | |
55 return (SymbolTable) VMObjectFactory.newObject(SymbolTable.class, tmp); | |
56 } | |
57 | |
58 public SymbolTable(Address addr) { | |
59 super(addr); | |
60 } | |
61 | |
62 /** Clone of VM's "temporary" probe routine, as the SA currently | |
63 does not support mutation so lookup() would have no effect | |
64 anyway. Returns null if the given string is not in the symbol | |
65 table. */ | |
66 public Symbol probe(String name) { | |
67 try { | |
68 return probe(toModifiedUTF8Bytes(name)); | |
69 } catch (IOException e) { | |
70 return null; | |
71 } | |
72 } | |
73 | |
74 /** Clone of VM's "temporary" probe routine, as the SA currently | |
75 does not support mutation so lookup() would have no effect | |
76 anyway. Returns null if the given string is not in the symbol | |
77 table. */ | |
78 public Symbol probe(byte[] name) { | |
79 long hashValue = hashSymbol(name); | |
80 for (HashtableEntry e = (HashtableEntry) bucket(hashToIndex(hashValue)); e != null; e = (HashtableEntry) e.next()) { | |
81 if (e.hash() == hashValue) { | |
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82 Symbol sym = Symbol.create(e.literalValue()); |
0 | 83 if (sym.equals(name)) { |
84 return sym; | |
85 } | |
86 } | |
87 } | |
88 return null; | |
89 } | |
90 | |
91 public interface SymbolVisitor { | |
92 public void visit(Symbol sym); | |
93 } | |
94 | |
95 public void symbolsDo(SymbolVisitor visitor) { | |
96 int numBuckets = tableSize(); | |
97 for (int i = 0; i < numBuckets; i++) { | |
98 for (HashtableEntry e = (HashtableEntry) bucket(i); e != null; | |
99 e = (HashtableEntry) e.next()) { | |
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100 visitor.visit(Symbol.create(e.literalValue())); |
0 | 101 } |
102 } | |
103 } | |
104 | |
105 private static byte[] toModifiedUTF8Bytes(String name) throws IOException { | |
106 ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
107 DataOutputStream dos = new DataOutputStream(baos); | |
108 dos.writeUTF(name); | |
109 dos.flush(); | |
110 byte[] buf = baos.toByteArray(); | |
111 byte[] res = new byte[buf.length - 2]; | |
112 // skip the length part | |
113 System.arraycopy(buf, 2, res, 0, res.length); | |
114 return res; | |
115 } | |
116 } |