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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 /** Very minimal port for now to get frames working */
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32
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33 public class StubRoutines {
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34 private static AddressField callStubReturnAddressField;
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35 private static AddressField callStubCompiledReturnAddressField;
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36
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37 static {
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38 VM.registerVMInitializedObserver(new Observer() {
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39 public void update(Observable o, Object data) {
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40 initialize(VM.getVM().getTypeDataBase());
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41 }
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42 });
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43 }
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44
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45 private static synchronized void initialize(TypeDataBase db) {
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46 Type type = db.lookupType("StubRoutines");
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47
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48 callStubReturnAddressField = type.getAddressField("_call_stub_return_address");
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49 // Only some platforms have specif return from compiled to call_stub
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50 try {
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51 callStubCompiledReturnAddressField = type.getAddressField("_call_stub_compiled_return");
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52 } catch (RuntimeException re) {
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53 callStubCompiledReturnAddressField = null;
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54 }
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55 }
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56
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57 public StubRoutines() {
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58 }
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59
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60 public boolean returnsToCallStub(Address returnPC) {
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61 Address addr = callStubReturnAddressField.getValue();
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62 boolean result = false;
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63 if (addr == null) {
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64 result = (addr == returnPC);
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65 } else {
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66 result = addr.equals(returnPC);
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67 }
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68 if (result || callStubCompiledReturnAddressField == null ) return result;
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69 // Could be a return to compiled code return point
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70 addr = callStubCompiledReturnAddressField.getValue();
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71 if (addr == null) {
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72 return (addr == returnPC);
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73 } else {
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74 return (addr.equals(returnPC));
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75 }
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76
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77 }
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78 }
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