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annotate graal/com.oracle.max.base/src/com/sun/max/lang/WordWidth.java @ 4184:fa6b78681c54

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Added copyright check to the gate.
author Doug Simon <doug.simon@oracle.com>
date Tue, 03 Jan 2012 12:37:31 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 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.max.lang;
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24
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25 import java.util.*;
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26
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27 /**
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28 * A word width value describes how many bits there are in a machine word.
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29 */
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30 public enum WordWidth {
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31
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32 BITS_8(8, byte.class, Byte.MIN_VALUE, Byte.MAX_VALUE, 3),
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33 BITS_16(16, short.class, Short.MIN_VALUE, Short.MAX_VALUE, 4),
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34 BITS_32(32, int.class, Integer.MIN_VALUE, Integer.MAX_VALUE, 5),
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35 BITS_64(64, long.class, Long.MIN_VALUE, Long.MAX_VALUE, 6);
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36
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37 public static final List<WordWidth> VALUES = java.util.Arrays.asList(values());
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38
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39 /**
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40 * Number of bits in a Word.
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41 * This must be a positive power of two.
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42 */
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43 public final int numberOfBits;
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44
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45 /**
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46 * Log2 of the number of bits.
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47 */
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48 public final int log2numberOfBits;
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49
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50 /**
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51 * Log2 of the number of bytes.
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52 */
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53 public final int log2numberOfBytes;
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54
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55 /**
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56 * Number of bytes in a Word.
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57 * This must be a positive power of two.
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58 */
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59 public final int numberOfBytes;
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60
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61 public final Class canonicalPrimitiveType;
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62 public final long min;
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63 public final long max;
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64
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65 private WordWidth(int numberOfBits, Class canonicalPrimitiveType, long min, long max, int log2numberOfBits) {
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66 this.numberOfBits = numberOfBits;
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67 this.numberOfBytes = numberOfBits / 8;
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68 this.canonicalPrimitiveType = canonicalPrimitiveType;
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69 this.min = min;
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70 this.max = max;
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71 this.log2numberOfBits = log2numberOfBits;
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72 this.log2numberOfBytes = log2numberOfBits - 3;
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73 }
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74
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75 public boolean lessThan(WordWidth other) {
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76 return numberOfBits < other.numberOfBits;
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77 }
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78
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79 public boolean lessEqual(WordWidth other) {
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80 return numberOfBits <= other.numberOfBits;
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81 }
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82
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83 public boolean greaterThan(WordWidth other) {
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84 return numberOfBits > other.numberOfBits;
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85 }
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86
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87 public boolean greaterEqual(WordWidth other) {
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88 return numberOfBits >= other.numberOfBits;
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89 }
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90
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91 @Override
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92 public String toString() {
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93 return Integer.toString(numberOfBits);
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94 }
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95
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96 public static WordWidth fromInt(int wordWidth) {
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97 if (wordWidth <= 8) {
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98 return WordWidth.BITS_8;
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99 }
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100 if (wordWidth <= 16) {
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101 return WordWidth.BITS_16;
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102 }
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103 if (wordWidth <= 32) {
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104 return WordWidth.BITS_32;
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105 }
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106 return WordWidth.BITS_64;
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107 }
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108
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109 /**
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110 * @return which word width is minimally required to represent all the non-one bits in the signed argument, and a sign bit
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111 */
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112 public static WordWidth signedEffective(int signed) {
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113 return fromInt(Ints.numberOfEffectiveSignedBits(signed));
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114 }
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115
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116 /**
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117 * @return which word width is minimally required to represent all the non-zero bits in the unsigned argument
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118 */
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119 public static WordWidth unsignedEffective(int unsigned) {
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120 return fromInt(Ints.numberOfEffectiveUnsignedBits(unsigned));
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121 }
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122
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123 /**
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124 * @return which word width is minimally required to represent all the non-one bits in the signed argument, and a sign bit
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125 */
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126 public static WordWidth signedEffective(long signed) {
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127 return fromInt(Longs.numberOfEffectiveSignedBits(signed));
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128 }
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129
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130 /**
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131 * @return which word width is minimally required to represent all the non-zero bits in the unsigned argument
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132 */
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133 public static WordWidth unsignedEffective(long unsigned) {
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134 return fromInt(Longs.numberOfEffectiveUnsignedBits(unsigned));
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135 }
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136 }