1 | /* GNU Objective C Runtime initialization |
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2 | Copyright (C) 1993, 1995 Free Software Foundation, Inc. |
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3 | Contributed by Kresten Krab Thorup |
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4 | |
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5 | This file is part of GNU CC. |
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6 | |
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7 | GNU CC 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 2, or (at your option) any later version. |
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10 | |
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11 | GNU CC 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 | You should have received a copy of the GNU General Public License along with |
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17 | GNU CC; see the file COPYING. If not, write to the Free Software |
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18 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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19 | |
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20 | /* As a special exception, if you link this library with files compiled with |
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21 | GCC to produce an executable, this does not cause the resulting executable |
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22 | to be covered by the GNU General Public License. This exception does not |
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23 | however invalidate any other reasons why the executable file might be |
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24 | covered by the GNU General Public License. */ |
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25 | |
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26 | #include "runtime.h" |
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27 | |
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28 | /* The version number of this runtime. This must match the number |
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29 | defined in gcc (objc-act.c) */ |
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30 | #define OBJC_VERSION 7 |
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31 | #define PROTOCOL_VERSION 2 |
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32 | |
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33 | /* This list contains all modules currently loaded into the runtime */ |
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34 | static struct objc_list* __objc_module_list = 0; |
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35 | |
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36 | /* This list contains all proto_list's not yet assigned class links */ |
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37 | static struct objc_list* unclaimed_proto_list = 0; |
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38 | |
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39 | /* List of unresolved static instances. */ |
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40 | static struct objc_list *uninitialized_statics; |
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41 | |
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42 | /* Check compiler vs runtime version */ |
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43 | static void init_check_module_version (Module_t); |
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44 | |
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45 | /* Assign isa links to protos */ |
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46 | static void __objc_init_protocols (struct objc_protocol_list* protos); |
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47 | |
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48 | /* Add protocol to class */ |
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49 | static void __objc_class_add_protocols (Class, struct objc_protocol_list*); |
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50 | |
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51 | /* This is a hook which is called by __objc_exec_class every time a class |
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52 | or a category is loaded into the runtime. This may e.g. help a |
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53 | dynamic loader determine the classes that have been loaded when |
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54 | an object file is dynamically linked in */ |
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55 | void (*_objc_load_callback)(Class class, Category* category) = 0; |
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56 | |
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57 | /* Is all categories/classes resolved? */ |
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58 | BOOL __objc_dangling_categories = NO; |
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59 | |
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60 | extern SEL |
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61 | __sel_register_typed_name (const char *name, const char *types, |
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62 | struct objc_selector *orig); |
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63 | |
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64 | /* Run through the statics list, removing modules as soon as all its statics |
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65 | have been initialized. */ |
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66 | static void |
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67 | objc_init_statics () |
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68 | { |
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69 | struct objc_list **cell = &uninitialized_statics; |
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70 | struct objc_static_instances **statics_in_module; |
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71 | |
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72 | while (*cell) |
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73 | { |
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74 | int module_initialized = 1; |
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75 | |
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76 | for (statics_in_module = (*cell)->head; |
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77 | *statics_in_module; statics_in_module++) |
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78 | { |
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79 | struct objc_static_instances *statics = *statics_in_module; |
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80 | Class class = objc_lookup_class (statics->class_name); |
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81 | |
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82 | if (!class) |
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83 | module_initialized = 0; |
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84 | /* Actually, the static's class_pointer will be NULL when we |
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85 | haven't been here before. However, the comparison is to be |
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86 | reminded of taking into account class posing and to think about |
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87 | possible semantics... */ |
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88 | else if (class != statics->instances[0]->class_pointer) |
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89 | { |
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90 | id *inst; |
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91 | |
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92 | for (inst = &statics->instances[0]; *inst; inst++) |
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93 | { |
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94 | (*inst)->class_pointer = class; |
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95 | |
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96 | /* ??? Make sure the object will not be freed. With |
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97 | refcounting, invoke `-retain'. Without refcounting, do |
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98 | nothing and hope that `-free' will never be invoked. */ |
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99 | |
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100 | /* ??? Send the object an `-initStatic' or something to |
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101 | that effect now or later on? What are the semantics of |
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102 | statically allocated instances, besides the trivial |
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103 | NXConstantString, anyway? */ |
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104 | } |
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105 | } |
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106 | } |
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107 | if (module_initialized) |
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108 | { |
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109 | /* Remove this module from the uninitialized list. */ |
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110 | struct objc_list *this = *cell; |
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111 | *cell = this->tail; |
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112 | free (this); |
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113 | } |
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114 | else |
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115 | cell = &(*cell)->tail; |
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116 | } |
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117 | } /* objc_init_statics */ |
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118 | |
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119 | /* This function is called by constructor functions generated for each |
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120 | module compiled. (_GLOBAL_$I$...) The purpose of this function is to |
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121 | gather the module pointers so that they may be processed by the |
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122 | initialization routines as soon as possible */ |
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123 | |
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124 | void |
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125 | __objc_exec_class (Module_t module) |
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126 | { |
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127 | /* Have we processed any constructors previously? This flag is used to |
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128 | indicate that some global data structures need to be built. */ |
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129 | static BOOL previous_constructors = 0; |
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130 | |
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131 | static struct objc_list* unclaimed_categories = 0; |
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132 | |
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133 | /* The symbol table (defined in objc-api.h) generated by gcc */ |
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134 | Symtab_t symtab = module->symtab; |
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135 | |
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136 | /* Entry used to traverse hash lists */ |
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137 | struct objc_list** cell; |
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138 | |
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139 | /* The table of selector references for this module */ |
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140 | SEL selectors = symtab->refs; |
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141 | |
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142 | /* dummy counter */ |
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143 | int i; |
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144 | |
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145 | DEBUG_PRINTF ("received module: %s\n", module->name); |
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146 | |
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147 | /* check gcc version */ |
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148 | init_check_module_version(module); |
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149 | |
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150 | /* On the first call of this routine, initialize some data structures. */ |
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151 | if (!previous_constructors) |
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152 | { |
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153 | __objc_init_selector_tables(); |
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154 | __objc_init_class_tables(); |
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155 | __objc_init_dispatch_tables(); |
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156 | previous_constructors = 1; |
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157 | } |
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158 | |
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159 | /* Save the module pointer for later processing. (not currently used) */ |
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160 | __objc_module_list = list_cons(module, __objc_module_list); |
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161 | |
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162 | /* Replace referenced selectors from names to SEL's. */ |
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163 | if (selectors) |
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164 | { |
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165 | for (i = 0; selectors[i].sel_id; ++i) |
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166 | { |
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167 | const char *name, *type; |
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168 | name = (char*)selectors[i].sel_id; |
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169 | type = (char*)selectors[i].sel_types; |
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170 | __sel_register_typed_name (name, type, |
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171 | (struct objc_selector*)&(selectors[i])); |
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172 | } |
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173 | } |
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174 | |
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175 | /* Parse the classes in the load module and gather selector information. */ |
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176 | DEBUG_PRINTF ("gathering selectors from module: %s\n", module->name); |
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177 | for (i = 0; i < symtab->cls_def_cnt; ++i) |
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178 | { |
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179 | Class class = (Class) symtab->defs[i]; |
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180 | |
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181 | /* Make sure we have what we think. */ |
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182 | assert (CLS_ISCLASS(class)); |
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183 | assert (CLS_ISMETA(class->class_pointer)); |
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184 | DEBUG_PRINTF ("phase 1, processing class: %s\n", class->name); |
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185 | |
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186 | /* Store the class in the class table and assign class numbers. */ |
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187 | __objc_add_class_to_hash (class); |
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188 | |
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189 | /* Register all of the selectors in the class and meta class. */ |
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190 | __objc_register_selectors_from_class (class); |
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191 | __objc_register_selectors_from_class ((Class) class->class_pointer); |
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192 | |
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193 | /* Install the fake dispatch tables */ |
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194 | __objc_install_premature_dtable(class); |
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195 | __objc_install_premature_dtable(class->class_pointer); |
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196 | |
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197 | if (class->protocols) |
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198 | __objc_init_protocols (class->protocols); |
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199 | |
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200 | if (_objc_load_callback) |
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201 | _objc_load_callback(class, 0); |
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202 | } |
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203 | |
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204 | /* Process category information from the module. */ |
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205 | for (i = 0; i < symtab->cat_def_cnt; ++i) |
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206 | { |
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207 | Category_t category = symtab->defs[i + symtab->cls_def_cnt]; |
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208 | Class class = objc_lookup_class (category->class_name); |
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209 | |
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210 | /* If the class for the category exists then append its methods. */ |
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211 | if (class) |
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212 | { |
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213 | |
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214 | DEBUG_PRINTF ("processing categories from (module,object): %s, %s\n", |
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215 | module->name, |
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216 | class->name); |
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217 | |
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218 | /* Do instance methods. */ |
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219 | if (category->instance_methods) |
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220 | class_add_method_list (class, category->instance_methods); |
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221 | |
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222 | /* Do class methods. */ |
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223 | if (category->class_methods) |
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224 | class_add_method_list ((Class) class->class_pointer, |
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225 | category->class_methods); |
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226 | |
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227 | if (category->protocols) |
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228 | { |
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229 | __objc_init_protocols (category->protocols); |
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230 | __objc_class_add_protocols (class, category->protocols); |
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231 | } |
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232 | |
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233 | if (_objc_load_callback) |
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234 | _objc_load_callback(class, category); |
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235 | } |
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236 | else |
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237 | { |
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238 | /* The object to which the category methods belong can't be found. |
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239 | Save the information. */ |
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240 | unclaimed_categories = list_cons(category, unclaimed_categories); |
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241 | } |
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242 | } |
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243 | |
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244 | if (module->statics) |
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245 | uninitialized_statics = list_cons (module->statics, uninitialized_statics); |
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246 | if (uninitialized_statics) |
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247 | objc_init_statics (); |
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248 | |
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249 | /* Scan the unclaimed category hash. Attempt to attach any unclaimed |
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250 | categories to objects. */ |
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251 | for (cell = &unclaimed_categories; |
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252 | *cell; |
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253 | ({ if (*cell) cell = &(*cell)->tail; })) |
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254 | { |
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255 | Category_t category = (*cell)->head; |
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256 | Class class = objc_lookup_class (category->class_name); |
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257 | |
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258 | if (class) |
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259 | { |
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260 | DEBUG_PRINTF ("attaching stored categories to object: %s\n", |
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261 | class->name); |
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262 | |
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263 | list_remove_head (cell); |
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264 | |
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265 | if (category->instance_methods) |
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266 | class_add_method_list (class, category->instance_methods); |
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267 | |
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268 | if (category->class_methods) |
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269 | class_add_method_list ((Class) class->class_pointer, |
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270 | category->class_methods); |
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271 | |
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272 | if (category->protocols) |
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273 | { |
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274 | __objc_init_protocols (category->protocols); |
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275 | __objc_class_add_protocols (class, category->protocols); |
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276 | } |
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277 | |
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278 | if (_objc_load_callback) |
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279 | _objc_load_callback(class, category); |
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280 | } |
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281 | } |
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282 | |
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283 | if (unclaimed_proto_list && objc_lookup_class ("Protocol")) |
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284 | { |
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285 | list_mapcar (unclaimed_proto_list,(void(*)(void*))__objc_init_protocols); |
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286 | list_free (unclaimed_proto_list); |
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287 | unclaimed_proto_list = 0; |
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288 | } |
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289 | |
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290 | } |
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291 | |
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292 | /* Sanity check the version of gcc used to compile `module'*/ |
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293 | static void init_check_module_version(Module_t module) |
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294 | { |
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295 | if ((module->version != OBJC_VERSION) || (module->size != sizeof (Module))) |
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296 | { |
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297 | fprintf (stderr, "Module %s version %d doesn't match runtime %d\n", |
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298 | module->name, (int)module->version, OBJC_VERSION); |
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299 | if(module->version > OBJC_VERSION) |
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300 | fprintf (stderr, "Runtime (libobjc.a) is out of date\n"); |
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301 | else if (module->version < OBJC_VERSION) |
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302 | fprintf (stderr, "Compiler (gcc) is out of date\n"); |
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303 | else |
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304 | fprintf (stderr, "Objective C internal error -- bad Module size\n"); |
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305 | abort (); |
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306 | } |
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307 | } |
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308 | |
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309 | static void |
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310 | __objc_init_protocols (struct objc_protocol_list* protos) |
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311 | { |
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312 | int i; |
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313 | static Class proto_class = 0; |
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314 | |
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315 | if (! protos) |
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316 | return; |
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317 | |
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318 | if (!proto_class) |
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319 | proto_class = objc_lookup_class("Protocol"); |
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320 | |
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321 | if (!proto_class) |
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322 | { |
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323 | unclaimed_proto_list = list_cons (protos, unclaimed_proto_list); |
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324 | return; |
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325 | } |
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326 | |
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327 | #if 0 |
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328 | assert (protos->next == 0); /* only single ones allowed */ |
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329 | #endif |
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330 | |
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331 | for(i = 0; i < protos->count; i++) |
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332 | { |
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333 | struct objc_protocol* aProto = protos->list[i]; |
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334 | if (((size_t)aProto->class_pointer) == PROTOCOL_VERSION) |
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335 | { |
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336 | /* assign class pointer */ |
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337 | aProto->class_pointer = proto_class; |
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338 | |
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339 | /* init super protocols */ |
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340 | __objc_init_protocols (aProto->protocol_list); |
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341 | } |
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342 | else if (protos->list[i]->class_pointer != proto_class) |
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343 | { |
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344 | fprintf (stderr, |
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345 | "Version %d doesn't match runtime protocol version %d\n", |
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346 | (int)((char*)protos->list[i]->class_pointer-(char*)0), |
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347 | PROTOCOL_VERSION); |
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348 | abort (); |
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349 | } |
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350 | } |
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351 | } |
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352 | |
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353 | static void __objc_class_add_protocols (Class class, |
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354 | struct objc_protocol_list* protos) |
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355 | { |
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356 | /* Well... */ |
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357 | if (! protos) |
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358 | return; |
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359 | |
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360 | /* Add it... */ |
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361 | protos->next = class->protocols; |
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362 | class->protocols = protos; |
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363 | } |
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