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annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiVariable.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children f5328dda9714
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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 *
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34 */
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35 private static final long serialVersionUID = 4507578431686109809L;
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36
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37 /**
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38 * The identifier of the variable. This is a non-zero index in a contiguous 0-based name space.
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39 */
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40 public final int index;
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41
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42 /**
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43 * Creates a new variable.
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44 * @param kind
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45 * @param index
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46 */
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47 private CiVariable(CiKind kind, int index) {
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48 super(kind);
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49 this.index = index;
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50 }
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51
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52 private static CiVariable[] generate(CiKind kind, int count) {
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53 CiVariable[] variables = new CiVariable[count];
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54 for (int i = 0; i < count; i++) {
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55 variables[i] = new CiVariable(kind, i);
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56 }
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57 return variables;
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58 }
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59
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60 private static final int CACHE_PER_KIND_SIZE = 100;
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61
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62 /**
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63 * Cache of common variables.
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64 */
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65 private static final CiVariable[][] cache = new CiVariable[CiKind.values().length][];
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66 static {
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67 for (CiKind kind : CiKind.values()) {
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68 cache[kind.ordinal()] = generate(kind, CACHE_PER_KIND_SIZE);
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69 }
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70 }
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71
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72 /**
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73 * Gets a variable for a given kind and index.
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74 *
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75 * @param kind
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76 * @param index
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77 * @return the corresponding {@code CiVariable}
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78 */
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79 public static CiVariable get(CiKind kind, int index) {
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80 //assert kind == kind.stackKind() : "Variables can be only created for stack kinds";
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81 assert index >= 0;
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82 CiVariable[] cachedVars = cache[kind.ordinal()];
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83 if (index < cachedVars.length) {
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84 return cachedVars[index];
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85 }
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86 return new CiVariable(kind, index);
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87 }
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88
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89 @Override
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90 public boolean equals(Object obj) {
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91 if (this == obj) {
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92 return true;
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93 }
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94 if (obj instanceof CiVariable) {
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95 CiVariable var = (CiVariable) obj;
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96 return kind == var.kind && index == var.index;
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97 }
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98 return false;
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99 }
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100
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101 @Override
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102 public boolean equalsIgnoringKind(CiValue o) {
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103 if (this == o) {
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104 return true;
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105 }
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106 if (o instanceof CiVariable) {
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107 CiVariable var = (CiVariable) o;
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108 return index == var.index;
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109 }
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110 return false;
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111 }
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112
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113 @Override
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114 public int hashCode() {
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115 return (index << 4) | kind.ordinal();
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116 }
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117
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118 @Override
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119 public String name() {
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120 return "v" + index;
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121 }
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122 }