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annotate runtime/internal/switch.d @ 883:b52d5de7783f

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GC defines and linkage changes.
author Christian Kamm <kamm incasoftware de>
date Thu, 08 Jan 2009 18:20:02 +0100
parents 44f08170f4ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
443
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1 /*
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2 * Copyright (C) 2004-2007 by Digital Mars, www.digitalmars.com
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3 * Written by Walter Bright
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4 *
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5 * This software is provided 'as-is', without any express or implied
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6 * warranty. In no event will the authors be held liable for any damages
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7 * arising from the use of this software.
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8 *
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9 * Permission is granted to anyone to use this software for any purpose,
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10 * including commercial applications, and to alter it and redistribute it
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11 * freely, in both source and binary form, subject to the following
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12 * restrictions:
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13 *
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14 * o The origin of this software must not be misrepresented; you must not
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15 * claim that you wrote the original software. If you use this software
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16 * in a product, an acknowledgment in the product documentation would be
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17 * appreciated but is not required.
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18 * o Altered source versions must be plainly marked as such, and must not
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19 * be misrepresented as being the original software.
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20 * o This notice may not be removed or altered from any source
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21 * distribution.
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22 */
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23
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24 /*
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25 * Modified by Sean Kelly <sean@f4.ca> for use with Tango.
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26 */
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27
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28 private import tango.stdc.string;
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29 //private import tango.stdc.stdio;
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30
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31 /******************************************************
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32 * Support for switch statements switching on strings.
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33 * Input:
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34 * table[] sorted array of strings generated by compiler
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35 * ca string to look up in table
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36 * Output:
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37 * result index of match in table[]
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38 * -1 if not in table
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39 */
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40
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41 extern (C):
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42
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43 int _d_switch_string(char[][] table, char[] ca)
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44 in
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45 {
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46 //printf("in _d_switch_string()\n");
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47 assert(table.length >= 0);
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48 assert(ca.length >= 0);
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49
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50 // Make sure table[] is sorted correctly
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51 int j;
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52
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53 for (j = 1; j < table.length; j++)
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54 {
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55 size_t len1 = table[j - 1].length;
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56 size_t len2 = table[j].length;
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57
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58 assert(len1 <= len2);
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59 if (len1 == len2)
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60 {
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61 int ci;
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62
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63 ci = memcmp(table[j - 1].ptr, table[j].ptr, len1);
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64 assert(ci < 0); // ci==0 means a duplicate
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65 }
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66 }
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67 }
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68 out (result)
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69 {
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70 int i;
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71 int cj;
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72
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73 //printf("out _d_switch_string()\n");
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74 if (result == -1)
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75 {
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76 // Not found
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77 for (i = 0; i < table.length; i++)
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78 {
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79 if (table[i].length == ca.length)
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80 { cj = memcmp(table[i].ptr, ca.ptr, ca.length);
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81 assert(cj != 0);
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82 }
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83 }
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84 }
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85 else
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86 {
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87 assert(0 <= result && result < table.length);
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88 for (i = 0; 1; i++)
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89 {
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90 assert(i < table.length);
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91 if (table[i].length == ca.length)
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92 {
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93 cj = memcmp(table[i].ptr, ca.ptr, ca.length);
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94 if (cj == 0)
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95 {
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96 assert(i == result);
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97 break;
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98 }
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99 }
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100 }
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101 }
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102 }
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103 body
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104 {
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105 //printf("body _d_switch_string(%.*s)\n", ca.length, ca.ptr);
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106 size_t low;
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107 size_t high;
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108 size_t mid;
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109 ptrdiff_t c;
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110 char[] pca;
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111
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112 low = 0;
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113 high = table.length;
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114
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115 version (none)
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116 {
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117 // Print table
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118 printf("ca[] = '%s'\n", cast(char *)ca);
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119 for (mid = 0; mid < high; mid++)
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120 {
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121 pca = table[mid];
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122 printf("table[%d] = %d, '%.*s'\n", mid, pca.length, pca);
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123 }
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124 }
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125 if (high &&
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126 ca.length >= table[0].length &&
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127 ca.length <= table[high - 1].length)
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128 {
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129 // Looking for 0 length string, which would only be at the beginning
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130 if (ca.length == 0)
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131 return 0;
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132
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133 char c1 = ca[0];
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134
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135 // Do binary search
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136 while (low < high)
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137 {
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138 mid = (low + high) >> 1;
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139 pca = table[mid];
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140 c = cast(ptrdiff_t)(ca.length - pca.length);
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141 if (c == 0)
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142 {
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143 c = cast(ubyte)c1 - cast(ubyte)pca[0];
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144 if (c == 0)
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145 {
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146 c = memcmp(ca.ptr, pca.ptr, ca.length);
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147 if (c == 0)
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148 { //printf("found %d\n", mid);
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149 return cast(int)mid;
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150 }
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151 }
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152 }
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153 if (c < 0)
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154 {
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155 high = mid;
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156 }
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157 else
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158 {
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159 low = mid + 1;
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160 }
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161 }
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162 }
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163
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164 //printf("not found\n");
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165 return -1; // not found
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166 }
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167
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168 unittest
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169 {
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170 switch (cast(char []) "c")
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171 {
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172 case "coo":
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173 default:
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174 break;
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175 }
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176 }
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177
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178 /**********************************
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179 * Same thing, but for wide chars.
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180 */
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181
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182 int _d_switch_ustring(wchar[][] table, wchar[] ca)
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183 in
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184 {
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185 //printf("in _d_switch_ustring()\n");
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186 assert(table.length >= 0);
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187 assert(ca.length >= 0);
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188
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189 // Make sure table[] is sorted correctly
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190 int j;
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191
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192 for (j = 1; j < table.length; j++)
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193 {
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194 size_t len1 = table[j - 1].length;
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195 size_t len2 = table[j].length;
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196
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197 assert(len1 <= len2);
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198 if (len1 == len2)
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199 {
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200 int c;
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201
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202 c = memcmp(table[j - 1].ptr, table[j].ptr, len1 * wchar.sizeof);
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203 assert(c < 0); // c==0 means a duplicate
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204 }
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205 }
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206 }
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207 out (result)
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208 {
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209 int i;
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210 int c;
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211
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212 //printf("out _d_switch_string()\n");
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213 if (result == -1)
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214 {
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215 // Not found
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216 for (i = 0; i < table.length; i++)
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217 {
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218 if (table[i].length == ca.length)
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219 { c = memcmp(table[i].ptr, ca.ptr, ca.length * wchar.sizeof);
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diff changeset
220 assert(c != 0);
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221 }
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222 }
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223 }
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224 else
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225 {
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226 assert(0 <= result && result < table.length);
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227 for (i = 0; 1; i++)
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228 {
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229 assert(i < table.length);
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230 if (table[i].length == ca.length)
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231 {
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232 c = memcmp(table[i].ptr, ca.ptr, ca.length * wchar.sizeof);
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233 if (c == 0)
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234 {
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235 assert(i == result);
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236 break;
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237 }
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238 }
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239 }
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240 }
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241 }
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242 body
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243 {
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244 //printf("body _d_switch_ustring()\n");
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245 size_t low;
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246 size_t high;
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247 size_t mid;
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248 ptrdiff_t c;
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249 wchar[] pca;
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250
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251 low = 0;
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252 high = table.length;
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253
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254 /*
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255 // Print table
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256 wprintf("ca[] = '%.*s'\n", ca);
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257 for (mid = 0; mid < high; mid++)
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258 {
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259 pca = table[mid];
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260 wprintf("table[%d] = %d, '%.*s'\n", mid, pca.length, pca);
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261 }
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262 */
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263
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264 // Do binary search
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265 while (low < high)
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266 {
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267 mid = (low + high) >> 1;
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268 pca = table[mid];
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269 c = cast(ptrdiff_t)(ca.length - pca.length);
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270 if (c == 0)
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271 {
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272 c = memcmp(ca.ptr, pca.ptr, ca.length * wchar.sizeof);
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273 if (c == 0)
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274 { //printf("found %d\n", mid);
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275 return cast(int)mid;
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276 }
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277 }
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278 if (c < 0)
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279 {
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280 high = mid;
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281 }
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282 else
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283 {
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284 low = mid + 1;
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285 }
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286 }
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287 //printf("not found\n");
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288 return -1; // not found
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289 }
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290
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291
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292 unittest
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293 {
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294 switch (cast(wchar []) "c")
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295 {
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296 case "coo":
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297 default:
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298 break;
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299 }
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300 }
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301
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302
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303 /**********************************
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diff changeset
304 * Same thing, but for wide chars.
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305 */
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306
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307 int _d_switch_dstring(dchar[][] table, dchar[] ca)
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308 in
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309 {
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diff changeset
310 //printf("in _d_switch_dstring()\n");
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diff changeset
311 assert(table.length >= 0);
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diff changeset
312 assert(ca.length >= 0);
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313
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314 // Make sure table[] is sorted correctly
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315 int j;
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316
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317 for (j = 1; j < table.length; j++)
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318 {
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319 size_t len1 = table[j - 1].length;
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320 size_t len2 = table[j].length;
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321
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diff changeset
322 assert(len1 <= len2);
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diff changeset
323 if (len1 == len2)
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324 {
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325 int c;
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diff changeset
326
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parents:
diff changeset
327 c = memcmp(table[j - 1].ptr, table[j].ptr, len1 * dchar.sizeof);
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
328 assert(c < 0); // c==0 means a duplicate
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parents:
diff changeset
329 }
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
330 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
331 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
332 out (result)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
333 {
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
334 int i;
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parents:
diff changeset
335 int c;
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parents:
diff changeset
336
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parents:
diff changeset
337 //printf("out _d_switch_string()\n");
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parents:
diff changeset
338 if (result == -1)
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
339 {
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
340 // Not found
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
341 for (i = 0; i < table.length; i++)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
342 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
343 if (table[i].length == ca.length)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
344 { c = memcmp(table[i].ptr, ca.ptr, ca.length * dchar.sizeof);
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
345 assert(c != 0);
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
346 }
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
347 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
348 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
349 else
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
350 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
351 assert(0 <= result && result < table.length);
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
352 for (i = 0; 1; i++)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
353 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
354 assert(i < table.length);
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
355 if (table[i].length == ca.length)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
356 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
357 c = memcmp(table[i].ptr, ca.ptr, ca.length * dchar.sizeof);
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
358 if (c == 0)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
359 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
360 assert(i == result);
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parents:
diff changeset
361 break;
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
362 }
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
363 }
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
364 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
365 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
366 }
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parents:
diff changeset
367 body
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
368 {
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
369 //printf("body _d_switch_ustring()\n");
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parents:
diff changeset
370 size_t low;
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diff changeset
371 size_t high;
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
372 size_t mid;
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diff changeset
373 ptrdiff_t c;
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diff changeset
374 dchar[] pca;
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parents:
diff changeset
375
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diff changeset
376 low = 0;
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diff changeset
377 high = table.length;
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parents:
diff changeset
378
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parents:
diff changeset
379 /*
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parents:
diff changeset
380 // Print table
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diff changeset
381 wprintf("ca[] = '%.*s'\n", ca);
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parents:
diff changeset
382 for (mid = 0; mid < high; mid++)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
383 {
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parents:
diff changeset
384 pca = table[mid];
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diff changeset
385 wprintf("table[%d] = %d, '%.*s'\n", mid, pca.length, pca);
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
386 }
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parents:
diff changeset
387 */
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parents:
diff changeset
388
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
389 // Do binary search
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parents:
diff changeset
390 while (low < high)
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
391 {
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parents:
diff changeset
392 mid = (low + high) >> 1;
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parents:
diff changeset
393 pca = table[mid];
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parents:
diff changeset
394 c = cast(ptrdiff_t)(ca.length - pca.length);
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
395 if (c == 0)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
396 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
397 c = memcmp(ca.ptr, pca.ptr, ca.length * dchar.sizeof);
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
398 if (c == 0)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
399 { //printf("found %d\n", mid);
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
400 return cast(int)mid;
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
401 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
402 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
403 if (c < 0)
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
404 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
405 high = mid;
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
406 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
407 else
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
408 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
409 low = mid + 1;
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
410 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
411 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
412 //printf("not found\n");
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parents:
diff changeset
413 return -1; // not found
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
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parents:
diff changeset
414 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
415
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
416
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
417 unittest
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parents:
diff changeset
418 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
419 switch (cast(dchar []) "c")
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
420 {
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
421 case "coo":
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
422 default:
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
423 break;
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
424 }
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
425 }