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/*
* Copyright (c) 2002, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.types.basic;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.types.*;
public abstract class BasicVtblAccess implements VtblAccess {
protected SymbolLookup symbolLookup;
protected String[] dllNames;
private Map typeToVtblMap = new HashMap();
public BasicVtblAccess(SymbolLookup symbolLookup,
String[] dllNames) {
this.symbolLookup = symbolLookup;
this.dllNames = dllNames;
}
static Object nullAddress = new Object();
public Address getVtblForType(Type type) {
if (type == null) {
return null;
}
Object result = typeToVtblMap.get(type);
if (result == nullAddress) {
return null;
}
if (result != null) {
return (Address)result;
}
String vtblSymbol = vtblSymbolForType(type);
if (vtblSymbol == null) {
typeToVtblMap.put(type, nullAddress);
return null;
}
for (int i = 0; i < dllNames.length; i++) {
Address addr = symbolLookup.lookup(dllNames[i], vtblSymbol);
if (addr != null) {
typeToVtblMap.put(type, addr);
return addr;
}
}
typeToVtblMap.put(type, nullAddress);
return null;
}
public void clearCaches() {
typeToVtblMap.clear();
}
protected abstract String vtblSymbolForType(Type type);
}
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