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111
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1 /* GNU Objective C Runtime ivar related functions.
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145
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2 Copyright (C) 2010-2020 Free Software Foundation, Inc.
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111
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3 Contributed by Nicola Pero
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation; either version 3, or (at your option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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14 details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "objc-private/common.h"
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26 #include "objc/runtime.h"
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27 #include "objc-private/module-abi-8.h" /* For runtime structures */
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28 #include "objc/thr.h"
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29 #include "objc-private/runtime.h" /* the kitchen sink */
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30 #include <string.h> /* For strcmp. */
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31 #include <stdlib.h> /* For malloc. */
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32
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33 struct objc_ivar *
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34 class_getInstanceVariable (Class class_, const char *name)
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35 {
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36 if (class_ != Nil && name != NULL && ! CLS_IS_IN_CONSTRUCTION (class_))
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37 {
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38 while (class_ != Nil)
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39 {
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40 struct objc_ivar_list *ivars = class_->ivars;
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41 if (ivars != NULL)
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42 {
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43 int i;
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44
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45 for (i = 0; i < ivars->ivar_count; i++)
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46 {
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47 struct objc_ivar *ivar = &(ivars->ivar_list[i]);
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48
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49 if (!strcmp (ivar->ivar_name, name))
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50 return ivar;
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51 }
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52 }
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53 class_ = class_getSuperclass (class_);
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54 }
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55 }
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56 return NULL;
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57 }
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58
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59 struct objc_ivar *
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60 class_getClassVariable (Class class_, const char *name)
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61 {
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62 if (class_ == Nil)
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63 return NULL;
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64
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65 /* Logically, since a class is an instance of its meta-class, and
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66 since its class methods are the instance methods of the
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67 meta-class, class variables should be instance variables of the
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68 meta-class. That is different from the normal use of having
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69 'static' variables in the class implementation file, because
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70 every class would have its own variables.
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71
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72 Anyway, it is all speculative at this stage, but if we get class
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73 variables in Objective-C, it is conceivable that this
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74 implementation should work. */
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75 return class_getInstanceVariable (class_->class_pointer, name);
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76 }
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77
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78 void *
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79 object_getIndexedIvars (id object)
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80 {
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81 if (object == nil)
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82 return NULL;
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83 else
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84 return (void *)(((char *)object)
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85 + object->class_pointer->instance_size);
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86 }
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87
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88 struct objc_ivar *
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89 object_getInstanceVariable (id object, const char *name, void **returnValue)
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90 {
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91 if (object == nil || name == NULL)
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92 return NULL;
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93 else
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94 {
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95 struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name);
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96
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97 if (variable != NULL && returnValue != NULL)
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98 {
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99 char *location = (char *)object + variable->ivar_offset;
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100
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101 *returnValue = *((id *)location);
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102 }
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103
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104 return variable;
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105 }
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106 }
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107
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108 struct objc_ivar *
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109 object_setInstanceVariable (id object, const char *name, void *newValue)
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110 {
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111 if (object == nil || name == NULL)
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112 return NULL;
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113 else
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114 {
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115 struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name);
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116
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117 if (variable != NULL)
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118 {
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119 char *location = (char *)object + variable->ivar_offset;
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120
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121 *((id *)location) = (id)newValue;
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122 }
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123
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124 return variable;
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125 }
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126 }
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127
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128 id object_getIvar (id object, struct objc_ivar * variable)
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129 {
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130 if (object == nil || variable == NULL)
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131 return nil;
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132 else
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133 {
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134 char *location = (char *)object + variable->ivar_offset;
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135
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136 return *((id *)location);
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137 }
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138 }
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139
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140 void object_setIvar (id object, struct objc_ivar * variable, id value)
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141 {
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142 if (object == nil || variable == NULL)
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143 return;
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144 else
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145 {
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146 char *location = (char *)object + variable->ivar_offset;
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147
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148 *((id *)location) = value;
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149 }
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150 }
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151
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152 const char * ivar_getName (struct objc_ivar * variable)
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153 {
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154 if (variable == NULL)
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155 return NULL;
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156
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157 return variable->ivar_name;
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158 }
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159
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160 ptrdiff_t ivar_getOffset (struct objc_ivar * variable)
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161 {
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162 if (variable == NULL)
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163 return 0;
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164
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165 return (ptrdiff_t)(variable->ivar_offset);
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166 }
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167
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168 const char * ivar_getTypeEncoding (struct objc_ivar * variable)
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169 {
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170 if (variable == NULL)
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171 return NULL;
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172
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173 return variable->ivar_type;
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174 }
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175
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176 struct objc_ivar ** class_copyIvarList (Class class_, unsigned int *numberOfReturnedIvars)
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177 {
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178 unsigned int count = 0;
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179 struct objc_ivar **returnValue = NULL;
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180 struct objc_ivar_list* ivar_list;
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181
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182 if (class_ == Nil || CLS_IS_IN_CONSTRUCTION (class_) || !class_->ivars)
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183 {
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184 if (numberOfReturnedIvars)
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185 *numberOfReturnedIvars = 0;
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186 return NULL;
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187 }
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188
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189 /* Count how many ivars we have. */
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190 ivar_list = class_->ivars;
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191 count = ivar_list->ivar_count;
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192
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193 if (count != 0)
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194 {
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195 unsigned int i = 0;
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196
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197 /* Allocate enough memory to hold them. */
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198 returnValue = (struct objc_ivar **)(malloc (sizeof (struct objc_ivar *) * (count + 1)));
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199
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200 /* Copy the ivars. */
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201 for (i = 0; i < count; i++)
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202 returnValue[i] = &(ivar_list->ivar_list[i]);
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203
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204 returnValue[i] = NULL;
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205 }
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206
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207 if (numberOfReturnedIvars)
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208 *numberOfReturnedIvars = count;
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209
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210 return returnValue;
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211 }
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212
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213 BOOL
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214 class_addIvar (Class class_, const char * ivar_name, size_t size,
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215 unsigned char log_2_of_alignment, const char *type)
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216 {
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217 struct objc_ivar_list *ivars;
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218
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219 if (class_ == Nil
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220 || (! CLS_IS_IN_CONSTRUCTION (class_))
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221 || ivar_name == NULL
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222 || (strcmp (ivar_name, "") == 0)
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223 || size == 0
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224 || type == NULL)
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225 return NO;
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226
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227 /* Check if the class has an instance variable with that name
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228 already. */
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229 ivars = class_->ivars;
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230
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231 if (ivars != NULL)
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232 {
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233 int i;
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234
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235 for (i = 0; i < ivars->ivar_count; i++)
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236 {
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237 struct objc_ivar *ivar = &(ivars->ivar_list[i]);
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238
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239 if (strcmp (ivar->ivar_name, ivar_name) == 0)
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240 return NO;
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241 }
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242 }
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243
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244 /* Ok, no direct ivars. Check superclasses. */
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245 if (class_getInstanceVariable (objc_getClass ((char *)(class_->super_class)),
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246 ivar_name))
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247 return NO;
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248
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249 /* Good. Create space for the new instance variable. */
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250 if (ivars)
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251 {
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252 int ivar_count = ivars->ivar_count + 1;
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253 int new_size = sizeof (struct objc_ivar_list)
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254 + (ivar_count - 1) * sizeof (struct objc_ivar);
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255
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256 ivars = (struct objc_ivar_list*) objc_realloc (ivars, new_size);
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257 ivars->ivar_count = ivar_count;
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258 class_->ivars = ivars;
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259 }
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260 else
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261 {
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262 int new_size = sizeof (struct objc_ivar_list);
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263
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264 ivars = (struct objc_ivar_list*) objc_malloc (new_size);
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265 ivars->ivar_count = 1;
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266 class_->ivars = ivars;
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267 }
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268
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269 /* Now ivars is set to a list of instance variables of the right
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270 size. */
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271 {
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272 struct objc_ivar *ivar = &(ivars->ivar_list[ivars->ivar_count - 1]);
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273 unsigned int alignment = 1 << log_2_of_alignment;
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274 int misalignment;
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275
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276 ivar->ivar_name = objc_malloc (strlen (ivar_name) + 1);
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277 strcpy ((char *)ivar->ivar_name, ivar_name);
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278
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279 ivar->ivar_type = objc_malloc (strlen (type) + 1);
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280 strcpy ((char *)ivar->ivar_type, type);
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281
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282 /* The new instance variable is placed at the end of the existing
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283 instance_size, at the first byte that is aligned with
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284 alignment. */
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285 misalignment = class_->instance_size % alignment;
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286
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287 if (misalignment == 0)
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288 ivar->ivar_offset = class_->instance_size;
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289 else
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290 ivar->ivar_offset = class_->instance_size - misalignment + alignment;
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291
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292 class_->instance_size = ivar->ivar_offset + size;
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293 }
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294
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295 return YES;
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296 }
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297
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298
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299 const char *
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300 property_getName (struct objc_property * property __attribute__ ((__unused__)))
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301 {
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302 if (property == NULL)
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303 return NULL;
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304
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305 /* TODO: New ABI. */
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306 /* The current ABI does not have any information on properties. */
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307 return NULL;
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308 }
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309
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310 const char *
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311 property_getAttributes (struct objc_property * property __attribute__ ((__unused__)))
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312 {
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313 if (property == NULL)
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314 return NULL;
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315
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316 /* TODO: New ABI. */
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317 /* The current ABI does not have any information on properties. */
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318 return NULL;
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319 }
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320
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321 struct objc_property *
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322 class_getProperty (Class class_ __attribute__ ((__unused__)),
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323 const char *propertyName __attribute__ ((__unused__)))
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324 {
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325 if (class_ == NULL || propertyName == NULL)
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326 return NULL;
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327
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328 /* TODO: New ABI. */
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329 /* The current ABI does not have any information on class properties. */
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330 return NULL;
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331 }
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332
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333 struct objc_property **
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334 class_copyPropertyList (Class class_ __attribute__ ((__unused__)),
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335 unsigned int *numberOfReturnedProperties __attribute__ ((__unused__)))
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336 {
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337 if (class_ == Nil)
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338 {
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339 if (numberOfReturnedProperties)
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340 *numberOfReturnedProperties = 0;
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341 return NULL;
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342 }
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343
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344 /* TODO: New ABI. */
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345 /* The current ABI does not have any information on class properties. */
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346 if (numberOfReturnedProperties)
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347 *numberOfReturnedProperties = 0;
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348
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349 return NULL;
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350 }
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351
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352 const char *
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353 class_getIvarLayout (Class class_ __attribute__ ((__unused__)))
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354 {
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355 return NULL;
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356 }
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357
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358 const char *
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359 class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__)))
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360 {
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361 return NULL;
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362 }
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363
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364 void
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365 class_setIvarLayout (Class class_ __attribute__ ((__unused__)),
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366 const char *layout __attribute__ ((__unused__)))
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367 {
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368 return;
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369 }
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370
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371 void
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372 class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)),
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373 const char *layout __attribute__ ((__unused__)))
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374 {
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375 return;
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376 }
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