1 /* 2 * Copyright (c) 2000, 2002, 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, 20 * CA 94065 USA or visit www.oracle.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.asm; 26 27 /** <P> Register is an abstraction over machine registers. </P> 28 29 <P> FIXME: should align constants with underlying VM code </P> */ 30 31 public abstract class Register extends ImmediateOrRegister { 32 /** Corresponds to the machine register code. -1 stands for invalid 33 register (initial value). */ 34 protected int number; 35 36 public Register() { 37 number = -1; 38 } 39 40 public Register(int number) { 41 this.number = number; 42 } 43 44 /** Must be overridden by subclass to indicate number of available 45 registers on this platform */ 46 public abstract int getNumberOfRegisters(); 47 48 public boolean isValid() { 49 return ((0 <= number) && (number <= getNumberOfRegisters())); 50 } 51 52 public int getNumber() { 53 return number; 54 } 55 56 public boolean equals(Object x) { 57 if (x == null) { 58 return false; 59 } 60 61 if (!getClass().equals(x.getClass())) { 62 return false; 63 } 64 65 Register reg = (Register) x; 66 67 return (reg.getNumber() == getNumber()); 68 } 69 70 public int hashCode() { 71 return number; 72 } 73 74 public boolean isRegister() { 75 return true; 76 } 77 78 public abstract boolean isStackPointer(); 79 public abstract boolean isFramePointer(); 80 public abstract boolean isFloat(); 81 }