Mercurial > projects > ldc
annotate runtime/internal/cast.d @ 818:e8f8cafcaa62
Fix fibers in tango patch
author | Christian Kamm <kamm incasoftware de> |
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date | Mon, 01 Dec 2008 20:26:32 +0100 |
parents | 44f08170f4ef |
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rev | line source |
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443
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:
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1 /* |
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2 * Copyright (C) 2004-2006 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 extern (C): |
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29 |
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30 //debug = PRINTF; |
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31 debug(PRINTF) int printf(char*, ...); |
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32 |
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33 /****************************************** |
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34 * Given a pointer: |
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35 * If it is an Object, return that Object. |
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36 * If it is an interface, return the Object implementing the interface. |
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37 * If it is null, return null. |
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38 * Else, undefined crash |
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39 */ |
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40 |
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41 Object _d_toObject(void* p) |
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42 { Object o; |
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43 debug(PRINTF) printf("toObject(%p)\n", p); |
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44 if (p) |
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45 { |
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46 o = cast(Object)p; |
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47 debug(PRINTF) printf("o = %p\n", o); |
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48 debug(PRINTF) printf("o.vtbl = %p\n", *cast(void**)p); |
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49 ClassInfo oc = o.classinfo; |
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50 debug(PRINTF) printf("oc = %p\n", oc); |
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51 Interface *pi = **cast(Interface ***)p; |
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52 debug(PRINTF) printf("pi = %p\n", pi); |
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53 |
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54 /* Interface.offset lines up with ClassInfo.name.ptr, |
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55 * so we rely on pointers never being less than 64K, |
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56 * and interface vtable offsets never being greater. |
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57 */ |
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58 if (pi.offset < 0x10000) |
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59 { |
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60 debug(PRINTF) printf("\tpi.offset = %d\n", pi.offset); |
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61 o = cast(Object)(p - pi.offset); |
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62 } |
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63 } |
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64 debug(PRINTF) printf("toObject = %p\n", o); |
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65 return o; |
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66 } |
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67 |
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68 |
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69 /************************************* |
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70 * Attempts to cast Object o to class c. |
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71 * Returns o if successful, null if not. |
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72 */ |
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73 |
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74 Object _d_interface_cast(void* p, ClassInfo c) |
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75 { Object o; |
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76 |
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77 debug(PRINTF) printf("_d_interface_cast(p = %p, c = '%.*s')\n", p, c.name.length, c.name.ptr); |
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78 if (p) |
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79 { |
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80 Interface *pi = **cast(Interface ***)p; |
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81 |
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82 debug(PRINTF) printf("\tpi.offset = %d\n", pi.offset); |
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83 o = cast(Object)(p - pi.offset); |
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84 return _d_dynamic_cast(o, c); |
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85 } |
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86 debug(PRINTF) printf("_d_interface_cast = %p\n", o); |
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87 return o; |
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88 } |
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89 |
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90 Object _d_dynamic_cast(Object o, ClassInfo c) |
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91 { ClassInfo oc; |
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92 size_t offset = 0; |
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93 |
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94 debug(PRINTF) printf("_d_dynamic_cast(o = %p, c = '%.*s')\n", o, c.name.length, c.name.ptr); |
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95 |
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96 if (o) |
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97 { |
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98 oc = o.classinfo; |
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99 if (_d_isbaseof2(oc, c, offset)) |
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100 { |
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101 debug(PRINTF) printf("\toffset = %d\n", offset); |
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102 o = cast(Object)(cast(void*)o + offset); |
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103 } |
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104 else |
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105 o = null; |
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106 } |
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107 //printf("\tresult = %p\n", o); |
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108 debug(PRINTF) printf("_d_dynamic_cast = %p\n", o); |
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109 return o; |
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110 } |
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111 |
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112 int _d_isbaseof2(ClassInfo oc, ClassInfo c, ref size_t offset) |
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113 { int i; |
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114 |
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115 debug(PRINTF) printf("_d_isbaseof2(%.*s, %.*s, %ul)\n", oc.name.length, oc.name.ptr, c.name.length, c.name.ptr, offset); |
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116 |
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117 if (oc is c) |
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118 return 1; |
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119 do |
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120 { |
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121 debug(PRINTF) printf("oc.interfaces.length = %ul\n", oc.interfaces.length); |
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122 if (oc.base is c) |
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123 return 1; |
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124 for (i = 0; i < oc.interfaces.length; i++) |
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125 { |
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126 ClassInfo ic; |
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127 |
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128 ic = oc.interfaces[i].classinfo; |
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129 debug(PRINTF) printf("checking %.*s\n", ic.name.length, ic.name.ptr); |
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130 if (ic is c) |
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131 { offset = cast(size_t)oc.interfaces[i].offset; |
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132 return 1; |
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133 } |
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134 } |
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135 for (i = 0; i < oc.interfaces.length; i++) |
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136 { |
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137 ClassInfo ic; |
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138 |
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139 ic = oc.interfaces[i].classinfo; |
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140 if (_d_isbaseof2(ic, c, offset)) |
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141 { offset = cast(size_t)oc.interfaces[i].offset; |
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142 return 1; |
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143 } |
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144 } |
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145 oc = oc.base; |
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146 } while (oc); |
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147 return 0; |
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148 } |
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149 |
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150 int _d_isbaseof(ClassInfo oc, ClassInfo c) |
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151 { int i; |
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152 |
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153 if (oc is c) |
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154 return 1; |
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155 do |
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156 { |
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157 if (oc.base is c) |
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158 return 1; |
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159 for (i = 0; i < oc.interfaces.length; i++) |
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160 { |
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161 ClassInfo ic; |
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162 |
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163 ic = oc.interfaces[i].classinfo; |
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164 if (ic is c || _d_isbaseof(ic, c)) |
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165 return 1; |
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166 } |
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167 oc = oc.base; |
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168 } while (oc); |
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169 return 0; |
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170 } |
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171 |
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172 /********************************* |
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173 * Find the vtbl[] associated with Interface ic. |
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174 */ |
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175 |
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176 void *_d_interface_vtbl(ClassInfo ic, Object o) |
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177 { int i; |
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178 ClassInfo oc; |
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179 |
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180 //printf("__d_interface_vtbl(o = %p, ic = %p)\n", o, ic); |
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181 |
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182 assert(o); |
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183 |
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184 oc = o.classinfo; |
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185 for (i = 0; i < oc.interfaces.length; i++) |
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186 { |
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187 ClassInfo oic; |
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188 |
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189 oic = oc.interfaces[i].classinfo; |
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190 if (oic is ic) |
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191 { |
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changeset
|
192 return cast(void *)oc.interfaces[i].vtbl; |
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
|
193 } |
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
|
194 } |
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
|
195 assert(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
|
196 } |