Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/lang/WordWidth.java @ 4222:8e2985cdaaa5
Renaming of VMExits and VMEntries part 3.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 04 Jan 2012 21:13:44 +0100 |
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rev | line source |
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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 } |