Mercurial > hg > graal-jvmci-8
diff agent/src/share/classes/sun/jvm/hotspot/runtime/VirtualConstructor.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/runtime/VirtualConstructor.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,97 @@ +/* + * Copyright 2000-2005 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.runtime; + +import java.util.*; +import sun.jvm.hotspot.debugger.*; +import sun.jvm.hotspot.debugger.cdbg.*; +import sun.jvm.hotspot.types.*; + +/** This class provides generalized "virtual constructor" + functionality for VMObjects. In simple terms, it creates + correctly-typed Java wrapper objects for underlying Addresses, + using the "RTTI-like" functionality of TypeDataBase. For example, + if the given Address really is a DefNewGeneration*, the Java object + created for it will be of type + sun.jvm.hotspot.memory.DefNewGeneration, assuming the mapping from + type "DefNewGeneration" to class + sun.jvm.hotspot.memory.DefNewGeneration has been set up. */ + +public class VirtualConstructor { + private TypeDataBase db; + private Map map; // Map<String, Class> + + public VirtualConstructor(TypeDataBase db) { + this.db = db; + map = new HashMap(); + } + + /** Adds a mapping from the given C++ type name to the given Java + class. The latter must be a subclass of + sun.jvm.hotspot.runtime.VMObject. Returns false if there was + already a class for this type name in the map. */ + public boolean addMapping(String cTypeName, Class clazz) { + if (map.get(cTypeName) != null) { + return false; + } + + map.put(cTypeName, clazz); + return true; + } + + /** Instantiate the most-precisely typed wrapper object available + for the type of the given Address. If no type in the mapping + matched the type of the Address, throws a WrongTypeException. + Returns null for a null address (similar behavior to + VMObjectFactory). */ + public VMObject instantiateWrapperFor(Address addr) throws WrongTypeException { + if (addr == null) { + return null; + } + + for (Iterator iter = map.keySet().iterator(); iter.hasNext(); ) { + String typeName = (String) iter.next(); + if (db.addressTypeIsEqualToType(addr, db.lookupType(typeName))) { + return (VMObject) VMObjectFactory.newObject((Class) map.get(typeName), addr); + } + } + + String message = "No suitable match for type of address " + addr; + CDebugger cdbg = VM.getVM().getDebugger().getCDebugger(); + if (cdbg != null) { + // Most common case: V-table pointer is the first field + Address vtblPtr = addr.getAddressAt(0); + LoadObject lo = cdbg.loadObjectContainingPC(vtblPtr); + if (lo != null) { + ClosestSymbol symbol = lo.closestSymbolToPC(vtblPtr); + if (symbol != null) { + message += " (nearest symbol is " + symbol.getName() + ")"; + } + } + } + + throw new WrongTypeException(message); + } +}