1 /* 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * 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.types.*; 30 31 /** This class provides generalized "virtual constructor" 32 functionality for VMObjects. In simple terms, it creates 33 correctly-typed Java wrapper objects for underlying Addresses, 34 using the "RTTI-like" functionality of TypeDataBase. For example, 35 if the given Address really is a DefNewGeneration*, the Java object 36 created for it will be of type 37 sun.jvm.hotspot.memory.DefNewGeneration, assuming the mapping from 38 type "DefNewGeneration" to class 39 sun.jvm.hotspot.memory.DefNewGeneration has been set up. */ 40 41 public class VirtualConstructor extends InstanceConstructor<VMObject> { 42 private TypeDataBase db; 43 private Map map; // Map<String, Class> 44 45 public VirtualConstructor(TypeDataBase db) { 46 this.db = db; 47 map = new HashMap(); 48 } 49 50 /** Adds a mapping from the given C++ type name to the given Java 51 class. The latter must be a subclass of 52 sun.jvm.hotspot.runtime.VMObject. Returns false if there was 53 already a class for this type name in the map. */ 54 public boolean addMapping(String cTypeName, Class clazz) { 55 if (map.get(cTypeName) != null) { 56 return false; 57 } 58 59 map.put(cTypeName, clazz); 60 return true; 61 } 62 63 /** Instantiate the most-precisely typed wrapper object available 64 for the type of the given Address. If no type in the mapping 65 matched the type of the Address, throws a WrongTypeException. 66 Returns null for a null address (similar behavior to 67 VMObjectFactory). */ 68 public VMObject instantiateWrapperFor(Address addr) throws WrongTypeException { 69 if (addr == null) { 70 return null; 71 } 72 73 for (Iterator iter = map.keySet().iterator(); iter.hasNext(); ) { 74 String typeName = (String) iter.next(); 75 if (db.addressTypeIsEqualToType(addr, db.lookupType(typeName))) { 76 return (VMObject) VMObjectFactory.newObject((Class) map.get(typeName), addr); 77 } 78 } 79 80 throw newWrongTypeException(addr); 81 } 82 }