Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/lang/Ints.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
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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 com.sun.max.util.*; |
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26 |
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27 /** |
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28 * Additional methods that one might want in java.lang.Integer |
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29 * and int array stuff. |
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30 */ |
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31 public final class Ints { |
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32 |
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33 // Utility classes should not be instantiated. |
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34 private Ints() { |
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35 } |
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36 |
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37 public static final int SIZE = 4; |
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38 public static final int WIDTH = 32; |
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39 |
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40 public static final Range VALUE_RANGE = new Range(Integer.MIN_VALUE, Integer.MAX_VALUE); |
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41 |
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42 public static final int K = 1024; |
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43 public static final int M = K * K; |
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44 |
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45 public static int compare(int greater, int lesser) { |
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46 if (greater > lesser) { |
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47 return 1; |
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48 } |
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49 if (greater == lesser) { |
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50 return 0; |
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51 } |
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52 return -1; |
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53 } |
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54 |
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55 public static int numberOfEffectiveSignedBits(int signed) { |
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56 if (signed >= 0) { |
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57 return 33 - Integer.numberOfLeadingZeros(signed); |
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58 } |
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59 return 33 - Integer.numberOfLeadingZeros(~signed); |
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60 } |
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61 |
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62 public static int numberOfEffectiveUnsignedBits(int unsigned) { |
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63 return 32 - Integer.numberOfLeadingZeros(unsigned); |
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64 } |
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65 |
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66 /** |
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67 * Returns an integer with all the bits in its two's complement binary representation that are at index {@code |
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68 * highestBitIndex} or lower set to 1. |
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69 * |
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70 * @param highestBitIndex the index of the highest bit to be set in the returned value. Only the low 5 bits of {@code |
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71 * highestBitIndex} are used. That is, if {@code highestBitIndex > 31} or {@code highestBitIndex < 0} then |
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72 * the highest bit to be set is given by {@code highestBitSet & 0x1F}. |
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73 */ |
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74 public static int lowBitsSet(int highestBitIndex) { |
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75 final int n = highestBitIndex & 0x1f; |
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76 return (1 << n) | ((1 << n) - 1); |
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77 } |
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78 |
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79 /** |
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80 * Returns an integer with all the bits in its two's complement binary representation that are at index {@code |
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81 * lowestBitIndex} or higher set to 1. |
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82 * |
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83 * @param lowestBitIndex the index of the lowest bit to be set in the returned value. Only the low 5 bits of {@code |
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84 * lowestBitIndex} are used. That is, if {@code lowestBitIndex > 31} or {@code lowestBitIndex < 0} then |
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85 * the lowest bit to be set is given by {@code lowestBitSet & 0x1F}. |
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86 */ |
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87 public static int highBitsSet(int lowestBitIndex) { |
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88 return ~((1 << lowestBitIndex) - 1); |
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89 } |
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90 |
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91 /** |
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92 * Determines if a given number is zero or a power of two. |
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93 */ |
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94 public static boolean isPowerOfTwoOrZero(int n) { |
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95 return Integer.lowestOneBit(n) == n; |
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96 } |
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97 |
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98 public static int log2(int n) { |
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99 if (n <= 0) { |
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100 throw new ArithmeticException(); |
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101 } |
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102 return 31 - Integer.numberOfLeadingZeros(n); |
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103 } |
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104 |
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105 public static int roundUp(int value, int by) { |
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106 final int rest = value % by; |
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107 if (rest == 0) { |
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108 return value; |
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109 } |
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110 if (value < 0) { |
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111 return value - rest; |
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112 } |
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113 return value + (by - rest); |
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114 } |
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115 |
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116 /** |
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117 * Calculates an unsigned integer which is greater than or equal to {@code value} and |
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118 * is a multiple of {@code by}. Results are undefined if {@code by} is not |
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119 * a power of two. |
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120 * @param value the unsigned integer which is to be rounded upwards. |
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121 * @param by a positive power of two. |
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122 * @return the unsigned integer calculated by rounding upwards to a multiple of {@code by}. |
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123 */ |
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124 public static int roundUnsignedUpByPowerOfTwo(int value, int by) { |
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125 assert isPowerOfTwoOrZero(by); |
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126 final int mask = by - 1; |
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127 return (value + mask) & ~mask; |
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128 } |
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129 |
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130 /** |
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131 * Returns the hexadecimal string representation of the given value with at least 8 digits, e.g. 0x0000CAFE. |
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132 */ |
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133 public static String toHexLiteral(int value) { |
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134 return "0x" + toPaddedHexString(value, '0'); |
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135 } |
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136 |
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137 /** |
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138 * Returns the given value as a hexadecimal number with at least 8 digits, e.g. 0000CAFE. |
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139 */ |
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140 public static String toPaddedHexString(int n, char pad) { |
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141 final String s = Integer.toHexString(n).toUpperCase(); |
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142 return Strings.times(pad, 8 - s.length()) + s; |
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143 } |
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144 |
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145 public static boolean contains(int[] array, int value) { |
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146 for (int element : array) { |
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147 if (element == value) { |
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148 return true; |
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149 } |
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150 } |
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151 return false; |
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152 } |
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153 |
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154 public static int[] append(int[] array, int element) { |
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155 final int resultLength = array.length + 1; |
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156 final int[] result = new int[resultLength]; |
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157 System.arraycopy(array, 0, result, 0, array.length); |
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158 result[array.length] = element; |
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159 return result; |
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160 } |
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161 |
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162 public static int[] append(int[] head, int[] tail) { |
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163 final int[] result = new int[head.length + tail.length]; |
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164 System.arraycopy(head, 0, result, 0, head.length); |
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165 System.arraycopy(tail, 0, result, head.length, tail.length); |
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166 return result; |
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167 } |
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168 |
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169 public static int[] createRange(int first, int last) { |
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170 if (first > last) { |
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171 throw new IllegalArgumentException(); |
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172 } |
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173 final int n = last + 1 - first; |
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174 final int[] result = new int[n]; |
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175 for (int i = 0; i < n; i++) { |
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176 result[i] = first + i; |
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177 } |
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178 return result; |
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179 } |
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180 |
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181 public static void copyAll(int[] fromArray, int[] toArray) { |
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182 for (int i = 0; i < fromArray.length; i++) { |
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183 toArray[i] = fromArray[i]; |
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184 } |
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185 } |
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186 |
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187 /** |
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188 * Returns a string representation of the contents of the specified array. |
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189 * Adjacent elements are separated by the specified separator. Elements are |
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190 * converted to strings as by <tt>String.valueOf(int)</tt>. |
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191 * |
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192 * @param array the array whose string representation to return |
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193 * @param separator the separator to use |
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194 * @return a string representation of <tt>array</tt> |
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195 * @throws NullPointerException if {@code array} or {@code separator} is null |
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196 */ |
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197 public static String toString(int[] array, String separator) { |
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198 if (array == null || separator == null) { |
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199 throw new NullPointerException(); |
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200 } |
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201 if (array.length == 0) { |
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202 return ""; |
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203 } |
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204 |
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205 final StringBuilder buf = new StringBuilder(); |
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|
206 buf.append(array[0]); |
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207 |
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208 for (int i = 1; i < array.length; i++) { |
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209 buf.append(separator); |
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|
210 buf.append(array[i]); |
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|
211 } |
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212 |
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213 return buf.toString(); |
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|
214 } |
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|
215 |
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216 private static final int [] sizeBase10Table = { |
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217 9, |
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218 99, |
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219 999, |
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220 9999, |
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221 99999, |
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222 999999, |
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|
223 9999999, |
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|
224 99999999, |
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|
225 999999999, Integer.MAX_VALUE |
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226 }; |
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227 |
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|
228 /** |
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229 * Computes the numbers of characters in the base-10 string representation of a given integer, including the '-' |
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230 * prefix for a negative integer. That is, this method computes the length of the String returned by |
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|
231 * {@link Integer#toString(int)} without requiring a String object to be created. |
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|
232 * |
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|
233 * @param i an integer |
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|
234 * @return the length of the string that would be returned by calling {@link Integer#toString(int)} with {@code i} |
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|
235 * as the argument |
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|
236 */ |
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|
237 public static int sizeOfBase10String(int x) { |
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238 if (x == Integer.MIN_VALUE) { |
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|
239 return "-2147483648".length(); |
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|
240 } |
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|
241 final int posX = x < 0 ? -x : x; |
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242 for (int i = 0;; i++) { |
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|
243 if (posX <= sizeBase10Table[i]) { |
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|
244 if (x < 0) { |
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|
245 return i + 2; |
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|
246 } |
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|
247 return i + 1; |
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|
248 } |
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|
249 } |
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|
250 } |
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|
251 |
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252 /** |
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253 * @see Longs#toUnitsString(long, boolean) |
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254 */ |
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255 public static String toUnitsString(long number, boolean onlyPowerOfTwo) { |
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256 return Longs.toUnitsString(number, onlyPowerOfTwo); |
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257 } |
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258 |
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259 /** |
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260 * Computes the minimum value in an array of integers. |
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261 * |
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262 * @param ints the array of integers from which the minimum is computed. This array must have at least one element. |
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263 * @return the minimum value in {@code ints} |
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264 * @throws ArrayIndexOutOfBoundsException if {@code ints.length == 0} |
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265 */ |
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266 public static int min(int[] ints) { |
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267 int min = ints[0]; |
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268 for (int n : ints) { |
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269 if (n < min) { |
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270 min = n; |
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271 } |
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272 } |
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273 return min; |
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274 } |
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275 |
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276 /** |
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277 * Computes the maximum value in an array of integers. |
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278 * |
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279 * @param ints the array of integers from which the maximum is computed. This array must have at least one element. |
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280 * @return the maximum value in {@code ints} |
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281 * @throws ArrayIndexOutOfBoundsException if {@code ints.length == 0} |
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282 */ |
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283 public static int max(int[] ints) { |
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284 int max = ints[0]; |
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285 for (int n : ints) { |
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286 if (n > max) { |
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287 max = n; |
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288 } |
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289 } |
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290 return max; |
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291 } |
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292 |
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293 } |