1 | /* GNU Objective-C Runtime API. |
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2 | Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or modify it |
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7 | under the terms of the GNU General Public License as published by the |
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8 | Free Software Foundation; either version 2, or (at your option) any |
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9 | 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 |
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12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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14 | License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with GNU CC; see the file COPYING. If not, write to |
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18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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20 | |
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21 | /* As a special exception, if you link this library with files compiled |
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22 | with GCC to produce an executable, this does not cause the resulting |
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23 | executable to be covered by the GNU General Public License. This |
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24 | exception does not however invalidate any other reasons why the |
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25 | executable file might be covered by the GNU General Public License. */ |
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26 | |
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27 | #ifndef __objc_api_INCLUDE_GNU |
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28 | #define __objc_api_INCLUDE_GNU |
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29 | |
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30 | #include "objc/objc.h" |
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31 | #include "objc/hash.h" |
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32 | #include "objc/thr.h" |
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33 | #include <stdio.h> |
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34 | #include <stdarg.h> |
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35 | |
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36 | /* For functions which return Method_t */ |
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37 | #define METHOD_NULL (Method_t)0 |
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38 | /* Boolean typedefs */ |
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39 | /* |
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40 | ** Method descriptor returned by introspective Object methods. |
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41 | ** This is really just the first part of the more complete objc_method |
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42 | ** structure defined below and used internally by the runtime. |
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43 | */ |
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44 | struct objc_method_description |
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45 | { |
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46 | SEL name; /* this is a selector, not a string */ |
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47 | char *types; /* type encoding */ |
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48 | }; |
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49 | |
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50 | /* Filer types used to describe Ivars and Methods. */ |
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51 | #define _C_ID '@' |
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52 | #define _C_CLASS '#' |
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53 | #define _C_SEL ':' |
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54 | #define _C_CHR 'c' |
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55 | #define _C_UCHR 'C' |
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56 | #define _C_SHT 's' |
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57 | #define _C_USHT 'S' |
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58 | #define _C_INT 'i' |
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59 | #define _C_UINT 'I' |
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60 | #define _C_LNG 'l' |
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61 | #define _C_ULNG 'L' |
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62 | #define _C_FLT 'f' |
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63 | #define _C_DBL 'd' |
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64 | #define _C_BFLD 'b' |
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65 | #define _C_VOID 'v' |
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66 | #define _C_UNDEF '?' |
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67 | #define _C_PTR '^' |
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68 | #define _C_CHARPTR '*' |
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69 | #define _C_ATOM '%' |
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70 | #define _C_ARY_B '[' |
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71 | #define _C_ARY_E ']' |
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72 | #define _C_UNION_B '(' |
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73 | #define _C_UNION_E ')' |
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74 | #define _C_STRUCT_B '{' |
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75 | #define _C_STRUCT_E '}' |
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76 | |
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77 | |
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78 | /* |
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79 | ** Error handling |
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80 | ** |
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81 | ** Call objc_error() or objc_verror() to record an error; this error |
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82 | ** routine will generally exit the program but not necessarily if the |
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83 | ** user has installed his own error handler. |
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84 | ** |
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85 | ** Call objc_set_error_handler to assign your own function for |
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86 | ** handling errors. The function should return YES if it is ok |
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87 | ** to continue execution, or return NO or just abort if the |
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88 | ** program should be stopped. The default error handler is just to |
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89 | ** print a message on stderr. |
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90 | ** |
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91 | ** The error handler function should be of type objc_error_handler |
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92 | ** The first parameter is an object instance of relevance. |
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93 | ** The second parameter is an error code. |
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94 | ** The third parameter is a format string in the printf style. |
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95 | ** The fourth parameter is a variable list of arguments. |
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96 | */ |
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97 | extern void objc_error(id object, int code, const char* fmt, ...); |
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98 | extern void objc_verror(id object, int code, const char* fmt, va_list ap); |
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99 | typedef BOOL (*objc_error_handler)(id, int code, const char *fmt, va_list ap); |
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100 | objc_error_handler objc_set_error_handler(objc_error_handler func); |
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101 | |
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102 | /* |
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103 | ** Error codes |
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104 | ** These are used by the runtime library, and your |
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105 | ** error handling may use them to determine if the error is |
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106 | ** hard or soft thus whether execution can continue or abort. |
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107 | */ |
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108 | #define OBJC_ERR_UNKNOWN 0 /* Generic error */ |
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109 | |
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110 | #define OBJC_ERR_OBJC_VERSION 1 /* Incorrect runtime version */ |
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111 | #define OBJC_ERR_GCC_VERSION 2 /* Incorrect compiler version */ |
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112 | #define OBJC_ERR_MODULE_SIZE 3 /* Bad module size */ |
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113 | #define OBJC_ERR_PROTOCOL_VERSION 4 /* Incorrect protocol version */ |
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114 | |
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115 | #define OBJC_ERR_MEMORY 10 /* Out of memory */ |
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116 | |
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117 | #define OBJC_ERR_RECURSE_ROOT 20 /* Attempt to archive the root |
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118 | object more than once. */ |
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119 | #define OBJC_ERR_BAD_DATA 21 /* Didn't read expected data */ |
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120 | #define OBJC_ERR_BAD_KEY 22 /* Bad key for object */ |
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121 | #define OBJC_ERR_BAD_CLASS 23 /* Unknown class */ |
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122 | #define OBJC_ERR_BAD_TYPE 24 /* Bad type specification */ |
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123 | #define OBJC_ERR_NO_READ 25 /* Cannot read stream */ |
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124 | #define OBJC_ERR_NO_WRITE 26 /* Cannot write stream */ |
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125 | #define OBJC_ERR_STREAM_VERSION 27 /* Incorrect stream version */ |
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126 | #define OBJC_ERR_BAD_OPCODE 28 /* Bad opcode */ |
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127 | |
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128 | #define OBJC_ERR_UNIMPLEMENTED 30 /* Method is not implemented */ |
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129 | |
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130 | #define OBJC_ERR_BAD_STATE 40 /* Bad thread state */ |
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131 | |
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132 | /* |
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133 | ** Set this variable nonzero to print a line describing each |
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134 | ** message that is sent. (this is currently disabled) |
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135 | */ |
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136 | extern BOOL objc_trace; |
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137 | |
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138 | |
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139 | /* For every class which happens to have statically allocated instances in |
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140 | this module, one OBJC_STATIC_INSTANCES is allocated by the compiler. |
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141 | INSTANCES is NULL terminated and points to all statically allocated |
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142 | instances of this class. */ |
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143 | struct objc_static_instances |
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144 | { |
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145 | char *class_name; |
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146 | id instances[0]; |
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147 | }; |
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148 | |
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149 | /* |
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150 | ** Whereas a Module (defined further down) is the root (typically) of a file, |
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151 | ** a Symtab is the root of the class and category definitions within the |
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152 | ** module. |
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153 | ** |
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154 | ** A Symtab contains a variable length array of pointers to classes and |
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155 | ** categories defined in the module. |
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156 | */ |
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157 | typedef struct objc_symtab { |
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158 | unsigned long sel_ref_cnt; /* Unknown. */ |
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159 | SEL refs; /* Unknown. */ |
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160 | unsigned short cls_def_cnt; /* Number of classes compiled |
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161 | (defined) in the module. */ |
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162 | unsigned short cat_def_cnt; /* Number of categories |
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163 | compiled (defined) in the |
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164 | module. */ |
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165 | |
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166 | void *defs[1]; /* Variable array of pointers. |
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167 | cls_def_cnt of type Class |
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168 | followed by cat_def_cnt of |
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169 | type Category_t, followed |
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170 | by a NULL terminated array |
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171 | of objc_static_instances. */ |
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172 | } Symtab, *Symtab_t; |
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173 | |
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174 | |
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175 | /* |
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176 | ** The compiler generates one of these structures for each module that |
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177 | ** composes the executable (eg main.m). |
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178 | ** |
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179 | ** This data structure is the root of the definition tree for the module. |
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180 | ** |
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181 | ** A collect program runs between ld stages and creates a ObjC ctor array. |
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182 | ** That array holds a pointer to each module structure of the executable. |
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183 | */ |
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184 | typedef struct objc_module { |
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185 | unsigned long version; /* Compiler revision. */ |
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186 | unsigned long size; /* sizeof(Module). */ |
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187 | const char* name; /* Name of the file where the |
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188 | module was generated. The |
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189 | name includes the path. */ |
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190 | |
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191 | Symtab_t symtab; /* Pointer to the Symtab of |
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192 | the module. The Symtab |
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193 | holds an array of |
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194 | pointers to |
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195 | the classes and categories |
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196 | defined in the module. */ |
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197 | } Module, *Module_t; |
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198 | |
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199 | |
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200 | /* |
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201 | ** The compiler generates one of these structures for a class that has |
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202 | ** instance variables defined in its specification. |
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203 | */ |
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204 | typedef struct objc_ivar* Ivar_t; |
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205 | typedef struct objc_ivar_list { |
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206 | int ivar_count; /* Number of structures (Ivar) |
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207 | contained in the list. One |
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208 | structure per instance |
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209 | variable defined in the |
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210 | class. */ |
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211 | struct objc_ivar { |
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212 | const char* ivar_name; /* Name of the instance |
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213 | variable as entered in the |
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214 | class definition. */ |
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215 | const char* ivar_type; /* Description of the Ivar's |
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216 | type. Useful for |
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217 | debuggers. */ |
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218 | int ivar_offset; /* Byte offset from the base |
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219 | address of the instance |
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220 | structure to the variable. */ |
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221 | |
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222 | } ivar_list[1]; /* Variable length |
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223 | structure. */ |
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224 | } IvarList, *IvarList_t; |
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225 | |
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226 | |
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227 | /* |
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228 | ** The compiler generates one (or more) of these structures for a class that |
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229 | ** has methods defined in its specification. |
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230 | ** |
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231 | ** The implementation of a class can be broken into separate pieces in a file |
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232 | ** and categories can break them across modules. To handle this problem is a |
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233 | ** singly linked list of methods. |
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234 | */ |
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235 | typedef struct objc_method Method; |
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236 | typedef Method* Method_t; |
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237 | typedef struct objc_method_list { |
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238 | struct objc_method_list* method_next; /* This variable is used to link |
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239 | a method list to another. It |
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240 | is a singly linked list. */ |
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241 | int method_count; /* Number of methods defined in |
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242 | this structure. */ |
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243 | struct objc_method { |
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244 | SEL method_name; /* This variable is the method's |
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245 | name. It is a char*. |
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246 | The unique integer passed to |
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247 | objc_msg_send is a char* too. |
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248 | It is compared against |
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249 | method_name using strcmp. */ |
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250 | const char* method_types; /* Description of the method's |
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251 | parameter list. Useful for |
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252 | debuggers. */ |
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253 | IMP method_imp; /* Address of the method in the |
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254 | executable. */ |
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255 | } method_list[1]; /* Variable length |
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256 | structure. */ |
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257 | } MethodList, *MethodList_t; |
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258 | |
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259 | struct objc_protocol_list { |
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260 | struct objc_protocol_list *next; |
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261 | int count; |
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262 | Protocol *list[1]; |
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263 | }; |
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264 | |
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265 | /* |
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266 | ** This is used to assure consistent access to the info field of |
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267 | ** classes |
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268 | */ |
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269 | #ifndef HOST_BITS_PER_LONG |
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270 | #define HOST_BITS_PER_LONG (sizeof(long)*8) |
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271 | #endif |
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272 | |
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273 | #define __CLS_INFO(cls) ((cls)->info) |
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274 | #define __CLS_ISINFO(cls, mask) ((__CLS_INFO(cls)&mask)==mask) |
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275 | #define __CLS_SETINFO(cls, mask) (__CLS_INFO(cls) |= mask) |
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276 | |
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277 | /* The structure is of type MetaClass */ |
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278 | #define _CLS_META 0x2L |
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279 | #define CLS_ISMETA(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_META)) |
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280 | |
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281 | |
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282 | /* The structure is of type Class */ |
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283 | #define _CLS_CLASS 0x1L |
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284 | #define CLS_ISCLASS(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_CLASS)) |
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285 | |
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286 | /* |
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287 | ** The class is initialized within the runtime. This means that |
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288 | ** it has had correct super and sublinks assigned |
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289 | */ |
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290 | #define _CLS_RESOLV 0x8L |
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291 | #define CLS_ISRESOLV(cls) __CLS_ISINFO(cls, _CLS_RESOLV) |
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292 | #define CLS_SETRESOLV(cls) __CLS_SETINFO(cls, _CLS_RESOLV) |
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293 | |
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294 | /* |
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295 | ** The class has been send a +initialize message or a such is not |
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296 | ** defined for this class |
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297 | */ |
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298 | #define _CLS_INITIALIZED 0x04L |
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299 | #define CLS_ISINITIALIZED(cls) __CLS_ISINFO(cls, _CLS_INITIALIZED) |
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300 | #define CLS_SETINITIALIZED(cls) __CLS_SETINFO(cls, _CLS_INITIALIZED) |
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301 | |
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302 | /* |
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303 | ** The class number of this class. This must be the same for both the |
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304 | ** class and it's meta class object |
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305 | */ |
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306 | #define CLS_GETNUMBER(cls) (__CLS_INFO(cls) >> (HOST_BITS_PER_LONG/2)) |
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307 | #define CLS_SETNUMBER(cls, num) \ |
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308 | ({ (cls)->info <<= (HOST_BITS_PER_LONG/2); \ |
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309 | (cls)->info >>= (HOST_BITS_PER_LONG/2); \ |
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310 | __CLS_SETINFO(cls, (((unsigned long)num) << (HOST_BITS_PER_LONG/2))); }) |
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311 | |
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312 | /* |
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313 | ** The compiler generates one of these structures for each category. A class |
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314 | ** may have many categories and contain both instance and factory methods. |
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315 | */ |
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316 | typedef struct objc_category { |
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317 | const char* category_name; /* Name of the category. Name |
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318 | contained in the () of the |
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319 | category definition. */ |
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320 | const char* class_name; /* Name of the class to which |
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321 | the category belongs. */ |
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322 | MethodList_t instance_methods; /* Linked list of instance |
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323 | methods defined in the |
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324 | category. NULL indicates no |
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325 | instance methods defined. */ |
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326 | MethodList_t class_methods; /* Linked list of factory |
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327 | methods defined in the |
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328 | category. NULL indicates no |
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329 | class methods defined. */ |
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330 | struct objc_protocol_list *protocols; /* List of Protocols |
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331 | conformed to */ |
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332 | } Category, *Category_t; |
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333 | |
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334 | /* |
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335 | ** Structure used when a message is send to a class's super class. The |
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336 | ** compiler generates one of these structures and passes it to |
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337 | ** objc_msg_super. |
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338 | */ |
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339 | typedef struct objc_super { |
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340 | id self; /* Id of the object sending |
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341 | the message. */ |
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342 | Class class; /* Object's super class. */ |
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343 | } Super, *Super_t; |
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344 | |
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345 | IMP objc_msg_lookup_super(Super_t super, SEL sel); |
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346 | |
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347 | retval_t objc_msg_sendv(id, SEL, arglist_t); |
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348 | |
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349 | |
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350 | |
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351 | /* |
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352 | ** This is a hook which is called by objc_lookup_class and |
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353 | ** objc_get_class if the runtime is not able to find the class. |
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354 | ** This may e.g. try to load in the class using dynamic loading. |
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355 | ** The function is guaranteed to be passed a non-NULL name string. |
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356 | */ |
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357 | extern Class (*_objc_lookup_class)(const char *name); |
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358 | |
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359 | /* |
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360 | ** This is a hook which is called by __objc_exec_class every time a class |
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361 | ** or a category is loaded into the runtime. This may e.g. help a |
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362 | ** dynamic loader determine the classes that have been loaded when |
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363 | ** an object file is dynamically linked in. |
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364 | */ |
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365 | extern void (*_objc_load_callback)(Class class, Category* category); |
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366 | |
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367 | /* |
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368 | ** Hook functions for allocating, copying and disposing of instances |
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369 | */ |
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370 | extern id (*_objc_object_alloc)(Class class); |
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371 | extern id (*_objc_object_copy)(id object); |
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372 | extern id (*_objc_object_dispose)(id object); |
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373 | |
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374 | /* |
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375 | ** Standard functions for memory allocation and disposal. |
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376 | ** Users should use these functions in their ObjC programs so |
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377 | ** that they work properly with garbage collectors as well as |
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378 | ** can take advantage of the exception/error handling available. |
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379 | */ |
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380 | void * |
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381 | objc_malloc(size_t size); |
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382 | |
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383 | void * |
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384 | objc_atomic_malloc(size_t size); |
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385 | |
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386 | void * |
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387 | objc_valloc(size_t size); |
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388 | |
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389 | void * |
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390 | objc_realloc(void *mem, size_t size); |
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391 | |
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392 | void * |
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393 | objc_calloc(size_t nelem, size_t size); |
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394 | |
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395 | void |
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396 | objc_free(void *mem); |
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397 | |
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398 | /* |
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399 | ** Hook functions for memory allocation and disposal. |
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400 | ** This makes it easy to substitute garbage collection systems |
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401 | ** such as Boehm's GC by assigning these function pointers |
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402 | ** to the GC's allocation routines. By default these point |
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403 | ** to the ANSI standard malloc, realloc, free, etc. |
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404 | ** |
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405 | ** Users should call the normal objc routines above for |
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406 | ** memory allocation and disposal within their programs. |
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407 | */ |
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408 | extern void *(*_objc_malloc)(size_t); |
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409 | extern void *(*_objc_atomic_malloc)(size_t); |
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410 | extern void *(*_objc_valloc)(size_t); |
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411 | extern void *(*_objc_realloc)(void *, size_t); |
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412 | extern void *(*_objc_calloc)(size_t, size_t); |
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413 | extern void (*_objc_free)(void *); |
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414 | |
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415 | Method_t class_get_class_method(MetaClass class, SEL aSel); |
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416 | |
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417 | Method_t class_get_instance_method(Class class, SEL aSel); |
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418 | |
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419 | Class class_pose_as(Class impostor, Class superclass); |
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420 | |
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421 | Class objc_get_class(const char *name); |
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422 | |
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423 | Class objc_lookup_class(const char *name); |
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424 | |
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425 | Class objc_next_class(void **enum_state); |
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426 | |
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427 | const char *sel_get_name(SEL selector); |
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428 | |
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429 | const char *sel_get_type(SEL selector); |
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430 | |
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431 | SEL sel_get_uid(const char *name); |
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432 | |
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433 | SEL sel_get_any_uid(const char *name); |
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434 | |
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435 | SEL sel_get_any_typed_uid(const char *name); |
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436 | |
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437 | SEL sel_get_typed_uid(const char *name, const char*); |
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438 | |
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439 | SEL sel_register_name(const char *name); |
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440 | |
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441 | SEL sel_register_typed_name(const char *name, const char*type); |
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442 | |
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443 | |
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444 | BOOL sel_is_mapped (SEL aSel); |
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445 | |
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446 | extern id class_create_instance(Class class); |
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447 | |
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448 | static inline const char * |
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449 | class_get_class_name(Class class) |
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450 | { |
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451 | return CLS_ISCLASS(class)?class->name:((class==Nil)?"Nil":0); |
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452 | } |
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453 | |
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454 | static inline long |
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455 | class_get_instance_size(Class class) |
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456 | { |
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457 | return CLS_ISCLASS(class)?class->instance_size:0; |
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458 | } |
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459 | |
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460 | static inline MetaClass |
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461 | class_get_meta_class(Class class) |
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462 | { |
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463 | return CLS_ISCLASS(class)?class->class_pointer:Nil; |
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464 | } |
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465 | |
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466 | static inline Class |
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467 | class_get_super_class(Class class) |
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468 | { |
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469 | return CLS_ISCLASS(class)?class->super_class:Nil; |
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470 | } |
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471 | |
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472 | static inline int |
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473 | class_get_version(Class class) |
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474 | { |
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475 | return CLS_ISCLASS(class)?class->version:-1; |
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476 | } |
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477 | |
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478 | static inline BOOL |
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479 | class_is_class(Class class) |
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480 | { |
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481 | return CLS_ISCLASS(class); |
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482 | } |
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483 | |
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484 | static inline BOOL |
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485 | class_is_meta_class(Class class) |
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486 | { |
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487 | return CLS_ISMETA(class); |
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488 | } |
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489 | |
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490 | |
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491 | static inline void |
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492 | class_set_version(Class class, long version) |
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493 | { |
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494 | if (CLS_ISCLASS(class)) |
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495 | class->version = version; |
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496 | } |
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497 | |
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498 | static inline IMP |
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499 | method_get_imp(Method_t method) |
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500 | { |
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501 | return (method!=METHOD_NULL)?method->method_imp:(IMP)0; |
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502 | } |
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503 | |
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504 | IMP get_imp (Class class, SEL sel); |
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505 | |
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506 | /* Redefine on NeXTSTEP so as not to conflict with system function */ |
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507 | #ifdef __NeXT__ |
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508 | #define object_copy gnu_object_copy |
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509 | #define object_dispose gnu_object_dispose |
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510 | #endif |
---|
511 | |
---|
512 | id object_copy(id object); |
---|
513 | |
---|
514 | id object_dispose(id object); |
---|
515 | |
---|
516 | static inline Class |
---|
517 | object_get_class(id object) |
---|
518 | { |
---|
519 | return ((object!=nil) |
---|
520 | ? (CLS_ISCLASS(object->class_pointer) |
---|
521 | ? object->class_pointer |
---|
522 | : (CLS_ISMETA(object->class_pointer) |
---|
523 | ? (Class)object |
---|
524 | : Nil)) |
---|
525 | : Nil); |
---|
526 | } |
---|
527 | |
---|
528 | static inline const char * |
---|
529 | object_get_class_name(id object) |
---|
530 | { |
---|
531 | return ((object!=nil)?(CLS_ISCLASS(object->class_pointer) |
---|
532 | ?object->class_pointer->name |
---|
533 | :((Class)object)->name) |
---|
534 | :"Nil"); |
---|
535 | } |
---|
536 | |
---|
537 | static inline MetaClass |
---|
538 | object_get_meta_class(id object) |
---|
539 | { |
---|
540 | return ((object!=nil)?(CLS_ISCLASS(object->class_pointer) |
---|
541 | ?object->class_pointer->class_pointer |
---|
542 | :(CLS_ISMETA(object->class_pointer) |
---|
543 | ?object->class_pointer |
---|
544 | :Nil)) |
---|
545 | :Nil); |
---|
546 | } |
---|
547 | |
---|
548 | static inline Class |
---|
549 | object_get_super_class |
---|
550 | (id object) |
---|
551 | { |
---|
552 | return ((object!=nil)?(CLS_ISCLASS(object->class_pointer) |
---|
553 | ?object->class_pointer->super_class |
---|
554 | :(CLS_ISMETA(object->class_pointer) |
---|
555 | ?((Class)object)->super_class |
---|
556 | :Nil)) |
---|
557 | :Nil); |
---|
558 | } |
---|
559 | |
---|
560 | static inline BOOL |
---|
561 | object_is_class(id object) |
---|
562 | { |
---|
563 | return CLS_ISCLASS((Class)object); |
---|
564 | } |
---|
565 | |
---|
566 | static inline BOOL |
---|
567 | object_is_instance(id object) |
---|
568 | { |
---|
569 | return (object!=nil)&&CLS_ISCLASS(object->class_pointer); |
---|
570 | } |
---|
571 | |
---|
572 | static inline BOOL |
---|
573 | object_is_meta_class(id object) |
---|
574 | { |
---|
575 | return CLS_ISMETA((Class)object); |
---|
576 | } |
---|
577 | |
---|
578 | struct sarray* |
---|
579 | objc_get_uninstalled_dtable(void); |
---|
580 | |
---|
581 | #endif /* not __objc_api_INCLUDE_GNU */ |
---|
582 | |
---|
583 | |
---|
584 | |
---|