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1 /*
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2 * Copyright 2002-2005 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.types.basic;
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26
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27 import java.util.*;
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28
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 public abstract class BasicVtblAccess implements VtblAccess {
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33 protected SymbolLookup symbolLookup;
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34 protected String[] dllNames;
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35
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36 private Map typeToVtblMap = new HashMap();
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37
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38 public BasicVtblAccess(SymbolLookup symbolLookup,
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39 String[] dllNames) {
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40 this.symbolLookup = symbolLookup;
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41 this.dllNames = dllNames;
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42 }
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43
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44 static Object nullAddress = new Object();
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45
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46 public Address getVtblForType(Type type) {
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47 if (type == null) {
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48 return null;
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49 }
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50 Object result = typeToVtblMap.get(type);
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51 if (result == nullAddress) {
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52 return null;
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53 }
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54 if (result != null) {
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55 return (Address)result;
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56 }
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57 String vtblSymbol = vtblSymbolForType(type);
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58 if (vtblSymbol == null) {
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59 typeToVtblMap.put(type, nullAddress);
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60 return null;
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61 }
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62 for (int i = 0; i < dllNames.length; i++) {
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63 Address addr = symbolLookup.lookup(dllNames[i], vtblSymbol);
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64 if (addr != null) {
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65 typeToVtblMap.put(type, addr);
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66 return addr;
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67 }
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68 }
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69 typeToVtblMap.put(type, nullAddress);
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70 return null;
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71 }
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72
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73 public void clearCaches() {
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74 typeToVtblMap.clear();
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75 }
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76
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77 protected abstract String vtblSymbolForType(Type type);
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78 }
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