Mercurial > hg > truffle
annotate 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 |
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children | bc8527f3071c |
rev | line source |
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1 /* |
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2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.cri.ci; |
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24 |
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25 /** |
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26 * Represents a value that is yet to be bound to a machine location (such as |
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27 * a {@linkplain CiRegister register} or stack {@linkplain CiAddress address}) |
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28 * by a register allocator. |
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29 */ |
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30 public final class CiVariable extends CiValue { |
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31 |
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32 /** |
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33 * The identifier of the variable. This is a non-zero index in a contiguous 0-based name space. |
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34 */ |
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35 public final int index; |
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36 |
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37 /** |
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38 * Creates a new variable. |
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39 * @param kind |
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40 * @param index |
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41 */ |
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42 private CiVariable(CiKind kind, int index) { |
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43 super(kind); |
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44 this.index = index; |
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45 } |
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46 |
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47 private static CiVariable[] generate(CiKind kind, int count) { |
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48 CiVariable[] variables = new CiVariable[count]; |
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49 for (int i = 0; i < count; i++) { |
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50 variables[i] = new CiVariable(kind, i); |
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51 } |
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52 return variables; |
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53 } |
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54 |
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55 private static final int CACHE_PER_KIND_SIZE = 100; |
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56 |
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57 /** |
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58 * Cache of common variables. |
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59 */ |
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60 private static final CiVariable[][] cache = new CiVariable[CiKind.values().length][]; |
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61 static { |
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62 for (CiKind kind : CiKind.values()) { |
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63 cache[kind.ordinal()] = generate(kind, CACHE_PER_KIND_SIZE); |
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64 } |
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65 } |
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66 |
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67 /** |
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68 * Gets a variable for a given kind and index. |
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69 * |
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70 * @param kind |
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71 * @param index |
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72 * @return the corresponding {@code CiVariable} |
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73 */ |
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74 public static CiVariable get(CiKind kind, int index) { |
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75 //assert kind == kind.stackKind() : "Variables can be only created for stack kinds"; |
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76 assert index >= 0; |
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77 CiVariable[] cachedVars = cache[kind.ordinal()]; |
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78 if (index < cachedVars.length) { |
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79 return cachedVars[index]; |
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80 } |
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81 return new CiVariable(kind, index); |
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82 } |
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83 |
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84 @Override |
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85 public boolean equals(Object obj) { |
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86 if (this == obj) { |
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87 return true; |
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88 } |
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89 if (obj instanceof CiVariable) { |
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90 CiVariable var = (CiVariable) obj; |
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91 return kind == var.kind && index == var.index; |
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92 } |
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93 return false; |
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94 } |
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95 |
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96 @Override |
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97 public boolean equalsIgnoringKind(CiValue o) { |
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98 if (this == o) { |
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99 return true; |
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100 } |
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101 if (o instanceof CiVariable) { |
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102 CiVariable var = (CiVariable) o; |
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103 return index == var.index; |
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104 } |
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105 return false; |
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106 } |
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107 |
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108 @Override |
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109 public int hashCode() { |
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110 return (index << 4) | kind.ordinal(); |
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111 } |
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112 |
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113 @Override |
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114 public String name() { |
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115 return "v" + index; |
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116 } |
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117 } |