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comparison graal/com.oracle.max.cri/src/com/sun/cri/ci/CiRegisterValue.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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children bc8527f3071c
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3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2009, 2011, 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, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.cri.ci;
24
25 /**
26 * Denotes a register that stores a value of a fixed kind. There is exactly one (canonical) instance of {@code
27 * CiRegisterValue} for each ({@link CiRegister}, {@link CiKind}) pair. Use {@link CiRegister#asValue(CiKind)} to
28 * retrieve the canonical {@link CiRegisterValue} instance for a given (register,kind) pair.
29 */
30 public final class CiRegisterValue extends CiValue {
31
32 /**
33 * The register.
34 */
35 public final CiRegister reg;
36
37 /**
38 * Should only be called from {@link CiRegister#CiRegister} to ensure canonicalization.
39 */
40 CiRegisterValue(CiKind kind, CiRegister register) {
41 super(kind);
42 this.reg = register;
43 }
44
45 @Override
46 public int hashCode() {
47 return kind.ordinal() ^ reg.number;
48 }
49
50 @Override
51 public boolean equals(Object o) {
52 return o == this;
53 }
54
55 @Override
56 public boolean equalsIgnoringKind(CiValue other) {
57 if (other instanceof CiRegisterValue) {
58 return ((CiRegisterValue) other).reg == reg;
59 }
60 return false;
61 }
62
63 @Override
64 public String name() {
65 return reg.name;
66 }
67
68 @Override
69 public CiRegister asRegister() {
70 return reg;
71 }
72 }