1 /* 2 * Copyright (c) 2002, 2005, 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.types.basic; 26 27 import java.util.*; 28 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.types.*; 31 32 public abstract class BasicVtblAccess implements VtblAccess { 33 protected SymbolLookup symbolLookup; 34 protected String[] dllNames; 35 36 private Map typeToVtblMap = new HashMap(); 37 BasicVtblAccess(SymbolLookup symbolLookup, String[] dllNames)38 public BasicVtblAccess(SymbolLookup symbolLookup, 39 String[] dllNames) { 40 this.symbolLookup = symbolLookup; 41 this.dllNames = dllNames; 42 } 43 44 static Object nullAddress = new Object(); 45 getVtblForType(Type type)46 public Address getVtblForType(Type type) { 47 if (type == null) { 48 return null; 49 } 50 Object result = typeToVtblMap.get(type); 51 if (result == nullAddress) { 52 return null; 53 } 54 if (result != null) { 55 return (Address)result; 56 } 57 String vtblSymbol = vtblSymbolForType(type); 58 if (vtblSymbol == null) { 59 typeToVtblMap.put(type, nullAddress); 60 return null; 61 } 62 for (int i = 0; i < dllNames.length; i++) { 63 Address addr = symbolLookup.lookup(dllNames[i], vtblSymbol); 64 if (addr != null) { 65 typeToVtblMap.put(type, addr); 66 return addr; 67 } 68 } 69 typeToVtblMap.put(type, nullAddress); 70 return null; 71 } 72 clearCaches()73 public void clearCaches() { 74 typeToVtblMap.clear(); 75 } 76 vtblSymbolForType(Type type)77 protected abstract String vtblSymbolForType(Type type); 78 } 79