| /* |
| * Copyright (c) 2000, 2002, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.asm; |
| |
| /** <P> Register is an abstraction over machine registers. </P> |
| |
| <P> FIXME: should align constants with underlying VM code </P> */ |
| |
| public abstract class Register extends ImmediateOrRegister { |
| /** Corresponds to the machine register code. -1 stands for invalid |
| register (initial value). */ |
| protected int number; |
| |
| public Register() { |
| number = -1; |
| } |
| |
| public Register(int number) { |
| this.number = number; |
| } |
| |
| /** Must be overridden by subclass to indicate number of available |
| registers on this platform */ |
| public abstract int getNumberOfRegisters(); |
| |
| public boolean isValid() { |
| return ((0 <= number) && (number <= getNumberOfRegisters())); |
| } |
| |
| public int getNumber() { |
| return number; |
| } |
| |
| public boolean equals(Object x) { |
| if (x == null) { |
| return false; |
| } |
| |
| if (!getClass().equals(x.getClass())) { |
| return false; |
| } |
| |
| Register reg = (Register) x; |
| |
| return (reg.getNumber() == getNumber()); |
| } |
| |
| public int hashCode() { |
| return number; |
| } |
| |
| public boolean isRegister() { |
| return true; |
| } |
| |
| public abstract boolean isStackPointer(); |
| public abstract boolean isFramePointer(); |
| public abstract boolean isFloat(); |
| } |