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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.asm;
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26
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27 /** <P> Register is an abstraction over machine registers. </P>
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28
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29 <P> FIXME: should align constants with underlying VM code </P> */
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30
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31 public abstract class Register extends ImmediateOrRegister {
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32 /** Corresponds to the machine register code. -1 stands for invalid
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33 register (initial value). */
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34 protected int number;
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35
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36 public Register() {
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37 number = -1;
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38 }
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39
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40 public Register(int number) {
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41 this.number = number;
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42 }
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43
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44 /** Must be overridden by subclass to indicate number of available
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45 registers on this platform */
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46 public abstract int getNumberOfRegisters();
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47
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48 public boolean isValid() {
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49 return ((0 <= number) && (number <= getNumberOfRegisters()));
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50 }
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51
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52 public int getNumber() {
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53 return number;
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54 }
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55
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56 public boolean equals(Object x) {
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57 if (x == null) {
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58 return false;
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59 }
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60
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61 if (!getClass().equals(x.getClass())) {
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62 return false;
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63 }
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64
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65 Register reg = (Register) x;
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66
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67 return (reg.getNumber() == getNumber());
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68 }
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69
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70 public int hashCode() {
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71 return number;
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72 }
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73
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74 public boolean isRegister() {
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75 return true;
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76 }
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77
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78 public abstract boolean isStackPointer();
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79 public abstract boolean isFramePointer();
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80 public abstract boolean isFloat();
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81 }
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