Mercurial > hg > truffle
comparison graal/com.oracle.max.cri/src/com/sun/cri/ci/CiVariable.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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3732:3e2e8b8abdaf | 3733:e233f5660da4 |
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1 /* | |
2 * Copyright (c) 2010, 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 * Represents a value that is yet to be bound to a machine location (such as | |
27 * a {@linkplain CiRegister register} or stack {@linkplain CiAddress address}) | |
28 * by a register allocator. | |
29 */ | |
30 public final class CiVariable extends CiValue { | |
31 | |
32 /** | |
33 * The identifier of the variable. This is a non-zero index in a contiguous 0-based name space. | |
34 */ | |
35 public final int index; | |
36 | |
37 /** | |
38 * Creates a new variable. | |
39 * @param kind | |
40 * @param index | |
41 */ | |
42 private CiVariable(CiKind kind, int index) { | |
43 super(kind); | |
44 this.index = index; | |
45 } | |
46 | |
47 private static CiVariable[] generate(CiKind kind, int count) { | |
48 CiVariable[] variables = new CiVariable[count]; | |
49 for (int i = 0; i < count; i++) { | |
50 variables[i] = new CiVariable(kind, i); | |
51 } | |
52 return variables; | |
53 } | |
54 | |
55 private static final int CACHE_PER_KIND_SIZE = 100; | |
56 | |
57 /** | |
58 * Cache of common variables. | |
59 */ | |
60 private static final CiVariable[][] cache = new CiVariable[CiKind.values().length][]; | |
61 static { | |
62 for (CiKind kind : CiKind.values()) { | |
63 cache[kind.ordinal()] = generate(kind, CACHE_PER_KIND_SIZE); | |
64 } | |
65 } | |
66 | |
67 /** | |
68 * Gets a variable for a given kind and index. | |
69 * | |
70 * @param kind | |
71 * @param index | |
72 * @return the corresponding {@code CiVariable} | |
73 */ | |
74 public static CiVariable get(CiKind kind, int index) { | |
75 //assert kind == kind.stackKind() : "Variables can be only created for stack kinds"; | |
76 assert index >= 0; | |
77 CiVariable[] cachedVars = cache[kind.ordinal()]; | |
78 if (index < cachedVars.length) { | |
79 return cachedVars[index]; | |
80 } | |
81 return new CiVariable(kind, index); | |
82 } | |
83 | |
84 @Override | |
85 public boolean equals(Object obj) { | |
86 if (this == obj) { | |
87 return true; | |
88 } | |
89 if (obj instanceof CiVariable) { | |
90 CiVariable var = (CiVariable) obj; | |
91 return kind == var.kind && index == var.index; | |
92 } | |
93 return false; | |
94 } | |
95 | |
96 @Override | |
97 public boolean equalsIgnoringKind(CiValue o) { | |
98 if (this == o) { | |
99 return true; | |
100 } | |
101 if (o instanceof CiVariable) { | |
102 CiVariable var = (CiVariable) o; | |
103 return index == var.index; | |
104 } | |
105 return false; | |
106 } | |
107 | |
108 @Override | |
109 public int hashCode() { | |
110 return (index << 4) | kind.ordinal(); | |
111 } | |
112 | |
113 @Override | |
114 public String name() { | |
115 return "v" + index; | |
116 } | |
117 } |