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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/InstanceConstructor.java @ 3939:f6f3bb0ee072

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7088955: add C2 IR support to the SA Reviewed-by: kvn
author never
date Sun, 11 Sep 2011 14:48:24 -0700
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3938:e6b1331a51d2 3939:f6f3bb0ee072
1 /*
2 * Copyright (c) 2011, 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.runtime;
26
27 import java.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.debugger.cdbg.CDebugger;
30 import sun.jvm.hotspot.debugger.cdbg.ClosestSymbol;
31 import sun.jvm.hotspot.debugger.cdbg.LoadObject;
32 import sun.jvm.hotspot.types.*;
33 import sun.jvm.hotspot.HotSpotTypeDataBase;
34
35 /** Given a pointer to some memory return an appropriate wrapper.
36 Various subclasses provide different mechanisms for identifying the
37 appropriate wrapper. */
38
39 abstract public class InstanceConstructor<T> {
40 /** Instantiate the most-precisely typed wrapper object available
41 for the type of the given Address. If no type in the mapping
42 matched the type of the Address, throws a WrongTypeException.
43 Returns null for a null address (similar behavior to
44 VMObjectFactory). */
45 abstract public T instantiateWrapperFor(Address addr) throws WrongTypeException;
46
47 protected WrongTypeException newWrongTypeException(Address addr) {
48 String message = "No suitable match for type of address " + addr;
49 CDebugger cdbg = VM.getVM().getDebugger().getCDebugger();
50 if (cdbg != null) {
51 // Most common case: V-table pointer is the first field
52 Address vtblPtr = addr.getAddressAt(0);
53 LoadObject lo = cdbg.loadObjectContainingPC(vtblPtr);
54 if (lo != null) {
55 ClosestSymbol symbol = lo.closestSymbolToPC(vtblPtr);
56 if (symbol != null) {
57 message += " (nearest symbol is " + symbol.getName() + ")";
58 }
59 }
60 }
61
62 return new WrongTypeException(message);
63 }
64 }