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annotate runtime/internal/cast.d @ 650:aa6a0b7968f7

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Added test case for bug #100 Removed dubious check for not emitting static private global in other modules without access. This should be handled properly somewhere else, it's causing unresolved global errors for stuff that should work (in MiniD)
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Sun, 05 Oct 2008 17:28:15 +0200
parents 44f08170f4ef
children
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443
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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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192 return cast(void *)oc.interfaces[i].vtbl;
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193 }
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194 }
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195 assert(0);
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196 }