Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicVtblAccess.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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/* * Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.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); }