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3939
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1 /*
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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 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.
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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.CDebugger;
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30 import sun.jvm.hotspot.debugger.cdbg.ClosestSymbol;
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31 import sun.jvm.hotspot.debugger.cdbg.LoadObject;
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32 import sun.jvm.hotspot.types.*;
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33 import sun.jvm.hotspot.HotSpotTypeDataBase;
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34
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35 /** This provides a factory to create instances where the base virtual
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36 * type is know and the expected subclasses are within a particular
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37 * package. */
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38
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39 public class VirtualBaseConstructor<T> extends InstanceConstructor {
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40 private TypeDataBase db;
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41 private HashMap map; // Map<String, Class>
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42 private Type baseType;
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43 private Class unknownTypeHandler;
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44
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45 public VirtualBaseConstructor(TypeDataBase db, Type baseType, String packageName, Class unknownTypeHandler) {
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46 this.db = (HotSpotTypeDataBase)db;
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47 map = new HashMap();
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48 this.baseType = baseType;
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49 this.unknownTypeHandler = unknownTypeHandler;
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50 // Try to find mirror types for each of the types. If there isn't
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51 // a direct mirror then try to find an instantiable superclass and
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52 // treat it as that.
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53 for (Iterator iter = db.getTypes(); iter.hasNext(); ) {
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54 Type t = (Type) iter.next();
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55 Type superType = t;
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56 while (superType != null && superType != baseType) {
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57 superType = superType.getSuperclass();
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58 }
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59 if (superType == baseType) {
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60 superType = t;
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61 Class c = null;
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62 while (c == null && superType != null) {
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63 try {
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64 c = Class.forName(packageName + "." + superType.getName());
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65 } catch (Exception e) {
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66 }
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67 if (c == null) superType = superType.getSuperclass();
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68 }
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69 if (c == null) {
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70 c = unknownTypeHandler;
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71 }
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72 map.put(t.getName(), c);
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73 }
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74 }
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75 }
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76
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77 /** Instantiate the most-precisely typed wrapper object available
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78 for the type of the given Address. If no type in the mapping
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79 matched the type of the Address, throws a WrongTypeException.
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80 Returns null for a null address (similar behavior to
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81 VMObjectFactory). */
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82 public VMObject instantiateWrapperFor(Address addr) throws WrongTypeException {
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83 if (addr == null) {
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84 return null;
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85 }
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86
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87 Type type = db.findDynamicTypeForAddress(addr, baseType);
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88 if (type != null) {
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89 return (VMObject) VMObjectFactory.newObject((Class) map.get(type.getName()), addr);
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90 } else if (unknownTypeHandler != null) {
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91 return (VMObject) VMObjectFactory.newObject(unknownTypeHandler, addr);
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92 }
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93
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94 throw newWrongTypeException(addr);
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95 }
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96 }
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