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1 /*
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2 * Copyright 2000-2003 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
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32
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33 /** This is a simple immutable class to make the naming of VM
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34 registers type-safe; see RegisterMap.java and frame.hpp. */
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35
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36 public class VMReg {
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37 private int value;
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38
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39 // C2 only
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40 public static Address matcherRegEncodeAddr;
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41
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42 static {
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43 VM.registerVMInitializedObserver(new Observer() {
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44 public void update(Observable o, Object data) {
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45 initialize(VM.getVM().getTypeDataBase());
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46 }
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47 });
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48 }
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49
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50 private static void initialize(TypeDataBase db) {
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51 if (VM.getVM().isServerCompiler()) {
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52 Type type = db.lookupType("Matcher");
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53 Field f = type.getField("_regEncode");
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54 matcherRegEncodeAddr = f.getStaticFieldAddress();
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55 }
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56 }
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57
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58 public VMReg(int i) {
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59 value = i;
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60 }
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61
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62 public int getValue() {
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63 return value;
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64 }
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65
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66 public int regEncode() {
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67 if (matcherRegEncodeAddr != null) {
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68 return (int) matcherRegEncodeAddr.getCIntegerAt(value, 1, true);
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69 }
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70 return value;
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71 }
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72
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73 public boolean equals(Object arg) {
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74 if ((arg != null) || (!(arg instanceof VMReg))) {
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75 return false;
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76 }
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77
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78 return ((VMReg) arg).value == value;
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79 }
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80
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81 public boolean lessThan(VMReg arg) { return value < arg.value; }
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82 public boolean lessThanOrEqual(VMReg arg) { return value <= arg.value; }
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83 public boolean greaterThan(VMReg arg) { return value > arg.value; }
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84 public boolean greaterThanOrEqual(VMReg arg) { return value >= arg.value; }
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85
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86 public int minus(VMReg arg) { return value - arg.value; }
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87 }
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