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annotate druntime/src/compiler/ldc/cast_.d @ 1458:e0b2d67cfe7c

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Added druntime (this should be removed once it works).
author Robert Clipsham <robert@octarineparrot.com>
date Tue, 02 Jun 2009 17:43:06 +0100
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1458
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1 /**
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2 * Implementation of array assignment support routines.
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3 *
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4 * Copyright: Copyright Digital Mars 2004 - 2009.
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5 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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6 * Authors: Walter Bright, Sean Kelly
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7 *
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8 * Copyright Digital Mars 2004 - 2009.
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9 * Distributed under the Boost Software License, Version 1.0.
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10 * (See accompanying file LICENSE_1_0.txt or copy at
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11 * http://www.boost.org/LICENSE_1_0.txt)
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12 */
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13 module rt.cast_;
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14
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15 extern (C):
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16
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17 /******************************************
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18 * Given a pointer:
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19 * If it is an Object, return that Object.
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20 * If it is an interface, return the Object implementing the interface.
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21 * If it is null, return null.
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22 * Else, undefined crash
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23 */
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24
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25 Object _d_toObject(void* p)
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26 { Object o;
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27
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28 if (p)
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29 {
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30 o = cast(Object)p;
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31 ClassInfo oc = o.classinfo;
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32 Interface *pi = **cast(Interface ***)p;
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33
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34 /* Interface.offset lines up with ClassInfo.name.ptr,
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35 * so we rely on pointers never being less than 64K,
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36 * and Objects never being greater.
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37 */
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38 if (pi.offset < 0x10000)
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39 {
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40 //printf("\tpi.offset = %d\n", pi.offset);
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41 o = cast(Object)(p - pi.offset);
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42 }
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43 }
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44 return o;
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45 }
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46
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47
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48 /*************************************
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49 * Attempts to cast Object o to class c.
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50 * Returns o if successful, null if not.
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51 */
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52
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53 Object _d_interface_cast(void* p, ClassInfo c)
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54 { Object o;
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55
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56 //printf("_d_interface_cast(p = %p, c = '%.*s')\n", p, c.name);
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57 if (p)
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58 {
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59 Interface *pi = **cast(Interface ***)p;
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60
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61 //printf("\tpi.offset = %d\n", pi.offset);
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62 o = cast(Object)(p - pi.offset);
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63 return _d_dynamic_cast(o, c);
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64 }
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65 return o;
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66 }
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67
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68 Object _d_dynamic_cast(Object o, ClassInfo c)
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69 { ClassInfo oc;
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70 size_t offset = 0;
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71
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72 //printf("_d_dynamic_cast(o = %p, c = '%.*s')\n", o, c.name);
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73
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74 if (o)
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75 {
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76 oc = o.classinfo;
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77 if (_d_isbaseof2(oc, c, offset))
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78 {
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79 //printf("\toffset = %d\n", offset);
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80 o = cast(Object)(cast(void*)o + offset);
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81 }
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82 else
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83 o = null;
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84 }
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85 //printf("\tresult = %p\n", o);
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86 return o;
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87 }
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88
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89 int _d_isbaseof2(ClassInfo oc, ClassInfo c, inout size_t offset)
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90 { int i;
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91
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92 if (oc is c)
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93 return 1;
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94 do
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95 {
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96 if (oc.base is c)
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97 return 1;
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98 for (i = 0; i < oc.interfaces.length; i++)
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99 {
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100 ClassInfo ic;
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101
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102 ic = oc.interfaces[i].classinfo;
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103 if (ic is c)
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104 { offset = oc.interfaces[i].offset;
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105 return 1;
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106 }
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107 }
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108 for (i = 0; i < oc.interfaces.length; i++)
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109 {
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110 ClassInfo ic;
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111
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112 ic = oc.interfaces[i].classinfo;
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113 if (_d_isbaseof2(ic, c, offset))
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114 { offset = oc.interfaces[i].offset;
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115 return 1;
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116 }
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117 }
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118 oc = oc.base;
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119 } while (oc);
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120 return 0;
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121 }
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122
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123 int _d_isbaseof(ClassInfo oc, ClassInfo c)
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124 { int i;
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125
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126 if (oc is c)
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127 return 1;
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128 do
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129 {
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130 if (oc.base is c)
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131 return 1;
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132 for (i = 0; i < oc.interfaces.length; i++)
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133 {
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134 ClassInfo ic;
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135
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136 ic = oc.interfaces[i].classinfo;
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137 if (ic is c || _d_isbaseof(ic, c))
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138 return 1;
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139 }
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140 oc = oc.base;
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141 } while (oc);
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142 return 0;
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143 }
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144
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145 /*********************************
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146 * Find the vtbl[] associated with Interface ic.
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147 */
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148
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149 void *_d_interface_vtbl(ClassInfo ic, Object o)
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150 { int i;
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151 ClassInfo oc;
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152
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153 //printf("__d_interface_vtbl(o = %p, ic = %p)\n", o, ic);
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154
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155 assert(o);
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156
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157 oc = o.classinfo;
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158 for (i = 0; i < oc.interfaces.length; i++)
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159 {
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160 ClassInfo oic;
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161
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162 oic = oc.interfaces[i].classinfo;
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163 if (oic is ic)
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164 {
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165 return cast(void *)oc.interfaces[i].vtbl;
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166 }
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167 }
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168 assert(0);
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169 }