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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/VirtualConstructor.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 /*
2 * Copyright 2000-2005 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.runtime;
26
27 import java.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.debugger.cdbg.*;
30 import sun.jvm.hotspot.types.*;
31
32 /** This class provides generalized "virtual constructor"
33 functionality for VMObjects. In simple terms, it creates
34 correctly-typed Java wrapper objects for underlying Addresses,
35 using the "RTTI-like" functionality of TypeDataBase. For example,
36 if the given Address really is a DefNewGeneration*, the Java object
37 created for it will be of type
38 sun.jvm.hotspot.memory.DefNewGeneration, assuming the mapping from
39 type "DefNewGeneration" to class
40 sun.jvm.hotspot.memory.DefNewGeneration has been set up. */
41
42 public class VirtualConstructor {
43 private TypeDataBase db;
44 private Map map; // Map<String, Class>
45
46 public VirtualConstructor(TypeDataBase db) {
47 this.db = db;
48 map = new HashMap();
49 }
50
51 /** Adds a mapping from the given C++ type name to the given Java
52 class. The latter must be a subclass of
53 sun.jvm.hotspot.runtime.VMObject. Returns false if there was
54 already a class for this type name in the map. */
55 public boolean addMapping(String cTypeName, Class clazz) {
56 if (map.get(cTypeName) != null) {
57 return false;
58 }
59
60 map.put(cTypeName, clazz);
61 return true;
62 }
63
64 /** Instantiate the most-precisely typed wrapper object available
65 for the type of the given Address. If no type in the mapping
66 matched the type of the Address, throws a WrongTypeException.
67 Returns null for a null address (similar behavior to
68 VMObjectFactory). */
69 public VMObject instantiateWrapperFor(Address addr) throws WrongTypeException {
70 if (addr == null) {
71 return null;
72 }
73
74 for (Iterator iter = map.keySet().iterator(); iter.hasNext(); ) {
75 String typeName = (String) iter.next();
76 if (db.addressTypeIsEqualToType(addr, db.lookupType(typeName))) {
77 return (VMObject) VMObjectFactory.newObject((Class) map.get(typeName), addr);
78 }
79 }
80
81 String message = "No suitable match for type of address " + addr;
82 CDebugger cdbg = VM.getVM().getDebugger().getCDebugger();
83 if (cdbg != null) {
84 // Most common case: V-table pointer is the first field
85 Address vtblPtr = addr.getAddressAt(0);
86 LoadObject lo = cdbg.loadObjectContainingPC(vtblPtr);
87 if (lo != null) {
88 ClosestSymbol symbol = lo.closestSymbolToPC(vtblPtr);
89 if (symbol != null) {
90 message += " (nearest symbol is " + symbol.getName() + ")";
91 }
92 }
93 }
94
95 throw new WrongTypeException(message);
96 }
97 }