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1 /* GNU Objective C Runtime method related functions.
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2 Copyright (C) 2010-2020 Free Software Foundation, Inc.
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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" /* For __objc_runtime_mutex. */
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30 #include <stdlib.h> /* For malloc. */
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31
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32 SEL
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33 method_getName (struct objc_method * method)
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34 {
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35 if (method == NULL)
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36 return NULL;
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37
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38 return method->method_name;
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39 }
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40
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41 const char *
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42 method_getTypeEncoding (struct objc_method * method)
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43 {
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44 if (method == NULL)
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45 return NULL;
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46
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47 return method->method_types;
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48 }
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49
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50 IMP
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51 method_getImplementation (struct objc_method * method)
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52 {
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53 if (method == NULL)
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54 return NULL;
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55
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56 return method->method_imp;
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57 }
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58
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59 struct objc_method_description *
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60 method_getDescription (struct objc_method * method)
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61 {
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62 /* Note that the following returns NULL if method is NULL, which is
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63 fine. */
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64 return (struct objc_method_description *)method;
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65 }
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66
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67 struct objc_method **
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68 class_copyMethodList (Class class_, unsigned int *numberOfReturnedMethods)
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69 {
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70 unsigned int count = 0;
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71 struct objc_method **returnValue = NULL;
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72 struct objc_method_list* method_list;
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73
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74 if (class_ == Nil)
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75 {
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76 if (numberOfReturnedMethods)
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77 *numberOfReturnedMethods = 0;
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78 return NULL;
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79 }
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80
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81 /* Lock the runtime mutex because the class methods may be
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82 concurrently modified. */
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83 objc_mutex_lock (__objc_runtime_mutex);
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84
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85 /* Count how many methods we have. */
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86 method_list = class_->methods;
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87
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88 while (method_list)
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89 {
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90 count = count + method_list->method_count;
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91 method_list = method_list->method_next;
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92 }
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93
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94 if (count != 0)
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95 {
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96 unsigned int i = 0;
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97
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98 /* Allocate enough memory to hold them. */
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99 returnValue
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100 = (struct objc_method **)(malloc (sizeof (struct objc_method *)
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101 * (count + 1)));
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102
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103 /* Copy the methods. */
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104 method_list = class_->methods;
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105
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106 while (method_list)
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107 {
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108 int j;
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109 for (j = 0; j < method_list->method_count; j++)
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110 {
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111 returnValue[i] = &(method_list->method_list[j]);
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112 i++;
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113 }
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114 method_list = method_list->method_next;
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115 }
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116
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117 returnValue[i] = NULL;
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118 }
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119
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120 objc_mutex_unlock (__objc_runtime_mutex);
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121
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122 if (numberOfReturnedMethods)
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123 *numberOfReturnedMethods = count;
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124
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125 return returnValue;
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126 }
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127
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128 IMP
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129 method_setImplementation (struct objc_method * method, IMP implementation)
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130 {
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131 IMP old_implementation;
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132
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133 if (method == NULL || implementation == NULL)
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134 return NULL;
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135
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136 /* We lock the runtime mutex so that concurrent calls to change the
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137 same method won't conflict with each other. */
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138 objc_mutex_lock (__objc_runtime_mutex);
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139
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140 old_implementation = method->method_imp;
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141 method->method_imp = implementation;
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142
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143 /* That was easy :-). But now we need to find all classes that use
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144 this method, and update the IMP in the dispatch tables. */
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145 __objc_update_classes_with_methods (method, NULL);
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146
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147 objc_mutex_unlock (__objc_runtime_mutex);
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148
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149 return old_implementation;
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150 }
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151
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152 void
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153 method_exchangeImplementations (struct objc_method * method_a, struct objc_method * method_b)
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154 {
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155 IMP old_implementation_a;
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156 IMP old_implementation_b;
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157
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158 if (method_a == NULL || method_b == NULL)
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159 return;
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160
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161 /* We lock the runtime mutex so that concurrent calls to exchange
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162 similar methods won't conflict with each other. Each of them
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163 should be atomic. */
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164 objc_mutex_lock (__objc_runtime_mutex);
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165
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166 old_implementation_a = method_a->method_imp;
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167 old_implementation_b = method_b->method_imp;
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168
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169 method_a->method_imp = old_implementation_b;
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170 method_b->method_imp = old_implementation_a;
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171
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172 /* That was easy :-). But now we need to find all classes that use
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173 these methods, and update the IMP in the dispatch tables. */
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174 __objc_update_classes_with_methods (method_a, method_b);
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175
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176 objc_mutex_unlock (__objc_runtime_mutex);
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177 }
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