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3939
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1 /*
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2 * Copyright (c) 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 /** Given a pointer to some memory return an appropriate wrapper.
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36 Various subclasses provide different mechanisms for identifying the
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37 appropriate wrapper. */
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38
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39 abstract public class InstanceConstructor<T> {
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40 /** Instantiate the most-precisely typed wrapper object available
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41 for the type of the given Address. If no type in the mapping
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42 matched the type of the Address, throws a WrongTypeException.
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43 Returns null for a null address (similar behavior to
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44 VMObjectFactory). */
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45 abstract public T instantiateWrapperFor(Address addr) throws WrongTypeException;
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46
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47 protected WrongTypeException newWrongTypeException(Address addr) {
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48 String message = "No suitable match for type of address " + addr;
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49 CDebugger cdbg = VM.getVM().getDebugger().getCDebugger();
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50 if (cdbg != null) {
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51 // Most common case: V-table pointer is the first field
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52 Address vtblPtr = addr.getAddressAt(0);
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53 LoadObject lo = cdbg.loadObjectContainingPC(vtblPtr);
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54 if (lo != null) {
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55 ClosestSymbol symbol = lo.closestSymbolToPC(vtblPtr);
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56 if (symbol != null) {
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57 message += " (nearest symbol is " + symbol.getName() + ")";
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58 }
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59 }
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60 }
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61
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62 return new WrongTypeException(message);
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63 }
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64 }
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