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1 /*
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2 * Copyright 2000-2005 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.runtime;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.types.*;
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30
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31 /** <P> A JavaCallWrapper is constructed before each JavaCall and
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32 destroyed after the call. Its purpose is to allocate/deallocate a
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33 new handle block and to save/restore the last Java fp/sp. A
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34 pointer to the JavaCallWrapper is stored on the stack. </P>
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35
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36 <P> NOTE: this port is very minimal and is only designed to get
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37 frame traversal working. FIXME: we will have to add platform-
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38 specific stuff later and therefore a factory for these
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39 objects. </P> */
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40
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41 public class JavaCallWrapper extends VMObject {
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42 protected static AddressField anchorField;
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43 private static AddressField lastJavaSPField;
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44 private static AddressField lastJavaPCField;
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45
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46 static {
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47 VM.registerVMInitializedObserver(new Observer() {
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48 public void update(Observable o, Object data) {
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49 initialize(VM.getVM().getTypeDataBase());
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50 }
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51 });
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52 }
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53
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54 private static synchronized void initialize(TypeDataBase db) {
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55 Type type = db.lookupType("JavaCallWrapper");
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56 Type anchorType = db.lookupType("JavaFrameAnchor");
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57
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58 anchorField = type.getAddressField("_anchor");
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59 lastJavaSPField = anchorType.getAddressField("_last_Java_sp");
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60 lastJavaPCField = anchorType.getAddressField("_last_Java_pc");
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61 }
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62
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63 public JavaCallWrapper(Address addr) {
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64 super(addr);
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65 }
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66
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67 public Address getLastJavaSP() {
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68 return lastJavaSPField.getValue(addr.addOffsetTo(anchorField.getOffset()));
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69 }
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70
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71 public Address getLastJavaPC() {
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72 return lastJavaPCField.getValue(addr.addOffsetTo(anchorField.getOffset()));
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73 }
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74
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75 }
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