Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/asm/Register.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 2000-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.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 } |