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1 /*
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2 * Copyright 2000-2002 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 sun.jvm.hotspot.debugger.*;
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28 import sun.jvm.hotspot.types.*;
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29
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30 /** This interface is designed to allow a platform-specific
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31 implementation of the TypeDataBase.isOfType() method, while
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32 leaving the rest of the basic.* package platform independent. */
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33
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34 public interface VtblAccess {
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35 /** This is the necessarily platform-specific implementation.
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36 Attempt to return the address of the vtbl for the given
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37 polymorphic C++ type. This value will be used when searching
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38 nearby memory to implement isOfType() in as platform-independent
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39 a manner as possible. Returns null if this value was not
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40 available for the given type, which might indicate that the type
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41 was not polymorphic or that an error occurred while trying to
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42 find the symbol. Note that this method does not support multiple
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43 inheritance. */
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44 public Address getVtblForType(Type type);
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45
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46 /** Clear any cached values from symbol lookups in the target
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47 process. It is important that this mechanism be fast and for
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48 that reason the default implementation memoizes type-to-vtbl
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49 mappings. However, if the target process is resumed, these
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50 mappings may become invalid. */
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51 public void clearCaches();
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52 }
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