Mercurial > projects > ldc
annotate lphobos/std/random.d @ 1612:081c48283153
Merge DMD r278: bugzilla 370 Compiler stack overflow on recursive...
bugzilla 370 Compiler stack overflow on recursive typeof in function
declaration.
---
dmd/expression.c | 1 +
dmd/mtype.c | 7 +++++--
2 files changed, 6 insertions(+), 2 deletions(-)
author | Leandro Lucarella <llucax@gmail.com> |
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date | Wed, 06 Jan 2010 15:18:21 -0300 |
parents | 88e23f8c2354 |
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rev | line source |
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1 /** |
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2 * Macros: |
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3 * WIKI = Phobos/StdRandom |
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4 */ |
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5 |
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6 // random.d |
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7 // www.digitalmars.com |
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8 |
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9 /* NOTE: This file has been patched from the original DMD distribution to |
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10 work with the GDC compiler. |
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11 |
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12 Modified by David Friedman, September 2007 |
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13 */ |
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14 |
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15 module std.random; |
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16 |
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17 // Segments of the code in this file Copyright (c) 1997 by Rick Booth |
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18 // From "Inner Loops" by Rick Booth, Addison-Wesley |
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19 |
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20 version(linux) version = Unix; |
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21 |
473
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22 version (Win32) |
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23 { |
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24 extern(Windows) int QueryPerformanceCounter(ulong *count); |
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25 } |
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26 else version (Unix) |
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27 { |
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28 version(linux) import std.c.linux.linux; |
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29 else private import std.c.unix.unix; |
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30 } |
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31 |
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32 /* ===================== Random ========================= */ |
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33 |
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34 // BUG: not multithreaded |
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35 |
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36 private uint seed; // starting seed |
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37 private uint index; // ith random number |
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38 |
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39 /** |
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40 * The random number generator is seeded at program startup with a random value. |
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41 This ensures that each program generates a different sequence of random |
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42 numbers. To generate a repeatable sequence, use rand_seed() to start the |
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43 sequence. seed and index start it, and each successive value increments index. |
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44 This means that the $(I n)th random number of the sequence can be directly |
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45 generated |
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46 by passing index + $(I n) to rand_seed(). |
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47 |
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48 Note: This is more random, but slower, than C's rand() function. |
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49 To use C's rand() instead, import std.c.stdlib. |
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50 */ |
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51 |
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52 void rand_seed(uint seed, uint index) |
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53 { |
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54 .seed = seed; |
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55 .index = index; |
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56 } |
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57 |
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58 /** |
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59 * Get the next random number in sequence. |
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60 * BUGS: shares a global single state, not multithreaded |
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61 */ |
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62 |
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63 uint rand() |
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64 { |
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65 static uint xormix1[20] = |
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66 [ |
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67 0xbaa96887, 0x1e17d32c, 0x03bcdc3c, 0x0f33d1b2, |
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68 0x76a6491d, 0xc570d85d, 0xe382b1e3, 0x78db4362, |
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69 0x7439a9d4, 0x9cea8ac5, 0x89537c5c, 0x2588f55d, |
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70 0x415b5e1d, 0x216e3d95, 0x85c662e7, 0x5e8ab368, |
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71 0x3ea5cc8c, 0xd26a0f74, 0xf3a9222b, 0x48aad7e4 |
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72 ]; |
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73 |
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74 static uint xormix2[20] = |
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75 [ |
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76 0x4b0f3b58, 0xe874f0c3, 0x6955c5a6, 0x55a7ca46, |
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77 0x4d9a9d86, 0xfe28a195, 0xb1ca7865, 0x6b235751, |
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78 0x9a997a61, 0xaa6e95c8, 0xaaa98ee1, 0x5af9154c, |
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79 0xfc8e2263, 0x390f5e8c, 0x58ffd802, 0xac0a5eba, |
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80 0xac4874f6, 0xa9df0913, 0x86be4c74, 0xed2c123b |
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81 ]; |
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82 |
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83 uint hiword, loword, hihold, temp, itmpl, itmph, i; |
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84 |
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85 loword = seed; |
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86 hiword = index++; |
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87 for (i = 0; i < 4; i++) // loop limit can be 2..20, we choose 4 |
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88 { |
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89 hihold = hiword; // save hiword for later |
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90 temp = hihold ^ xormix1[i]; // mix up bits of hiword |
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91 itmpl = temp & 0xffff; // decompose to hi & lo |
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92 itmph = temp >> 16; // 16-bit words |
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93 temp = itmpl * itmpl + ~(itmph * itmph); // do a multiplicative mix |
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94 temp = (temp >> 16) | (temp << 16); // swap hi and lo halves |
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95 hiword = loword ^ ((temp ^ xormix2[i]) + itmpl * itmph); //loword mix |
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96 loword = hihold; // old hiword is loword |
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97 } |
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98 return hiword; |
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99 } |
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100 |
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101 static this() |
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102 { |
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103 ulong s; |
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104 |
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105 version(Win32) |
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106 { |
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107 QueryPerformanceCounter(&s); |
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108 } |
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109 else version(Unix) |
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110 { |
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111 // time.h |
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112 // sys/time.h |
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113 |
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114 timeval tv; |
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115 |
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116 if (gettimeofday(&tv, null)) |
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117 { // Some error happened - try time() instead |
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118 s = time(null); |
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119 } |
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120 else |
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121 { |
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122 s = cast(ulong)((cast(long)tv.tv_sec << 32) + tv.tv_usec); |
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123 } |
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124 } |
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125 else version(NoSystem) |
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126 { |
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127 // nothing |
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128 } |
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129 else |
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130 static assert(false); |
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131 rand_seed(cast(uint) s, cast(uint)(s >> 32)); |
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132 } |
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133 |
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134 |
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135 unittest |
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136 { |
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137 static uint results[10] = |
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138 [ |
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139 0x8c0188cb, |
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140 0xb161200c, |
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141 0xfc904ac5, |
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142 0x2702e049, |
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143 0x9705a923, |
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144 0x1c139d89, |
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145 0x346b6d1f, |
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146 0xf8c33e32, |
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147 0xdb9fef76, |
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148 0xa97fcb3f |
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149 ]; |
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150 int i; |
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151 uint seedsave = seed; |
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152 uint indexsave = index; |
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153 |
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154 rand_seed(1234, 5678); |
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155 for (i = 0; i < 10; i++) |
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156 { uint r = rand(); |
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157 //printf("0x%x,\n", rand()); |
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158 assert(r == results[i]); |
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159 } |
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160 |
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161 seed = seedsave; |
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162 index = indexsave; |
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163 } |