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1 /*
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2 * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.runtime;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.debugger.cdbg.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 /** This class provides generalized "virtual constructor"
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33 functionality for VMObjects. In simple terms, it creates
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34 correctly-typed Java wrapper objects for underlying Addresses,
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35 using the "RTTI-like" functionality of TypeDataBase. For example,
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36 if the given Address really is a DefNewGeneration*, the Java object
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37 created for it will be of type
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38 sun.jvm.hotspot.memory.DefNewGeneration, assuming the mapping from
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39 type "DefNewGeneration" to class
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40 sun.jvm.hotspot.memory.DefNewGeneration has been set up. */
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41
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42 public class VirtualConstructor {
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43 private TypeDataBase db;
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44 private Map map; // Map<String, Class>
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45
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46 public VirtualConstructor(TypeDataBase db) {
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47 this.db = db;
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48 map = new HashMap();
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49 }
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50
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51 /** Adds a mapping from the given C++ type name to the given Java
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52 class. The latter must be a subclass of
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53 sun.jvm.hotspot.runtime.VMObject. Returns false if there was
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54 already a class for this type name in the map. */
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55 public boolean addMapping(String cTypeName, Class clazz) {
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56 if (map.get(cTypeName) != null) {
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57 return false;
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58 }
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59
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60 map.put(cTypeName, clazz);
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61 return true;
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62 }
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63
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64 /** Instantiate the most-precisely typed wrapper object available
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65 for the type of the given Address. If no type in the mapping
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66 matched the type of the Address, throws a WrongTypeException.
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67 Returns null for a null address (similar behavior to
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68 VMObjectFactory). */
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69 public VMObject instantiateWrapperFor(Address addr) throws WrongTypeException {
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70 if (addr == null) {
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71 return null;
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72 }
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73
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74 for (Iterator iter = map.keySet().iterator(); iter.hasNext(); ) {
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75 String typeName = (String) iter.next();
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76 if (db.addressTypeIsEqualToType(addr, db.lookupType(typeName))) {
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77 return (VMObject) VMObjectFactory.newObject((Class) map.get(typeName), addr);
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78 }
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79 }
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80
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81 String message = "No suitable match for type of address " + addr;
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82 CDebugger cdbg = VM.getVM().getDebugger().getCDebugger();
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83 if (cdbg != null) {
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84 // Most common case: V-table pointer is the first field
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85 Address vtblPtr = addr.getAddressAt(0);
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86 LoadObject lo = cdbg.loadObjectContainingPC(vtblPtr);
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87 if (lo != null) {
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88 ClosestSymbol symbol = lo.closestSymbolToPC(vtblPtr);
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89 if (symbol != null) {
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90 message += " (nearest symbol is " + symbol.getName() + ")";
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91 }
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92 }
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93 }
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94
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95 throw new WrongTypeException(message);
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96 }
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97 }
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