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comparison agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicVtblAccess.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002-2005 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.types.basic;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31
32 public abstract class BasicVtblAccess implements VtblAccess {
33 protected SymbolLookup symbolLookup;
34 protected String[] dllNames;
35
36 private Map typeToVtblMap = new HashMap();
37
38 public BasicVtblAccess(SymbolLookup symbolLookup,
39 String[] dllNames) {
40 this.symbolLookup = symbolLookup;
41 this.dllNames = dllNames;
42 }
43
44 static Object nullAddress = new Object();
45
46 public Address getVtblForType(Type type) {
47 if (type == null) {
48 return null;
49 }
50 Object result = typeToVtblMap.get(type);
51 if (result == nullAddress) {
52 return null;
53 }
54 if (result != null) {
55 return (Address)result;
56 }
57 String vtblSymbol = vtblSymbolForType(type);
58 if (vtblSymbol == null) {
59 typeToVtblMap.put(type, nullAddress);
60 return null;
61 }
62 for (int i = 0; i < dllNames.length; i++) {
63 Address addr = symbolLookup.lookup(dllNames[i], vtblSymbol);
64 if (addr != null) {
65 typeToVtblMap.put(type, addr);
66 return addr;
67 }
68 }
69 typeToVtblMap.put(type, nullAddress);
70 return null;
71 }
72
73 public void clearCaches() {
74 typeToVtblMap.clear();
75 }
76
77 protected abstract String vtblSymbolForType(Type type);
78 }