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fdcbbfe7 NP |
1 | /* GNU Objective C Runtime ivar related functions. |
2 | Copyright (C) 2010 Free Software Foundation, Inc. | |
3 | Contributed by Nicola Pero | |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under the | |
8 | terms of the GNU General Public License as published by the Free Software | |
9 | Foundation; either version 3, or (at your option) any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more | |
14 | details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | #include "objc-private/common.h" | |
718a8e53 NP |
26 | #include "objc/runtime.h" |
27 | #include "objc-private/module-abi-8.h" /* For runtime structures */ | |
28 | #include "objc/thr.h" | |
ad9eef11 | 29 | #include "objc-private/runtime.h" /* the kitchen sink */ |
49a35931 NP |
30 | #include <string.h> /* For strcmp. */ |
31 | #include <stdlib.h> /* For malloc. */ | |
fdcbbfe7 NP |
32 | |
33 | struct objc_ivar * | |
34 | class_getInstanceVariable (Class class_, const char *name) | |
35 | { | |
6c5c7efd | 36 | if (class_ != Nil && name != NULL && ! CLS_IS_IN_CONSTRUCTION (class_)) |
fdcbbfe7 | 37 | { |
fdcbbfe7 NP |
38 | while (class_ != Nil) |
39 | { | |
40 | struct objc_ivar_list *ivars = class_->ivars; | |
41 | if (ivars != NULL) | |
42 | { | |
43 | int i; | |
44 | ||
45 | for (i = 0; i < ivars->ivar_count; i++) | |
46 | { | |
47 | struct objc_ivar *ivar = &(ivars->ivar_list[i]); | |
48 | ||
49 | if (!strcmp (ivar->ivar_name, name)) | |
575584a9 | 50 | return ivar; |
fdcbbfe7 NP |
51 | } |
52 | } | |
1cde73d7 | 53 | class_ = class_getSuperclass (class_); |
fdcbbfe7 | 54 | } |
fdcbbfe7 NP |
55 | } |
56 | return NULL; | |
57 | } | |
58 | ||
be05b0f5 NP |
59 | struct objc_ivar * |
60 | class_getClassVariable (Class class_, const char *name) | |
61 | { | |
62 | if (class_ == Nil) | |
63 | return NULL; | |
64 | ||
65 | /* Logically, since a class is an instance of its meta-class, and | |
66 | since its class methods are the instance methods of the | |
67 | meta-class, class variables should be instance variables of the | |
68 | meta-class. That is different from the normal use of having | |
69 | 'static' variables in the class implementation file, because | |
70 | every class would have its own variables. | |
71 | ||
72 | Anyway, it is all speculative at this stage, but if we get class | |
73 | variables in Objective-C, it is conceivable that this | |
74 | implementation should work. */ | |
75 | return class_getInstanceVariable (class_->class_pointer, name); | |
76 | } | |
77 | ||
fdcbbfe7 NP |
78 | void * |
79 | object_getIndexedIvars (id object) | |
80 | { | |
81 | if (object == nil) | |
82 | return NULL; | |
83 | else | |
575584a9 NP |
84 | return (void *)(((char *)object) |
85 | + object->class_pointer->instance_size); | |
fdcbbfe7 NP |
86 | } |
87 | ||
88 | struct objc_ivar * | |
89 | object_getInstanceVariable (id object, const char *name, void **returnValue) | |
90 | { | |
91 | if (object == nil || name == NULL) | |
92 | return NULL; | |
93 | else | |
94 | { | |
95 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
96 | ||
97 | if (variable != NULL && returnValue != NULL) | |
98 | { | |
99 | char *location = (char *)object + variable->ivar_offset; | |
100 | ||
101 | *returnValue = *((id *)location); | |
102 | } | |
103 | ||
104 | return variable; | |
105 | } | |
106 | } | |
107 | ||
108 | struct objc_ivar * | |
109 | object_setInstanceVariable (id object, const char *name, void *newValue) | |
110 | { | |
111 | if (object == nil || name == NULL) | |
112 | return NULL; | |
113 | else | |
114 | { | |
115 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
116 | ||
117 | if (variable != NULL) | |
118 | { | |
119 | char *location = (char *)object + variable->ivar_offset; | |
120 | ||
121 | *((id *)location) = (id)newValue; | |
122 | } | |
123 | ||
124 | return variable; | |
125 | } | |
126 | } | |
127 | ||
128 | id object_getIvar (id object, struct objc_ivar * variable) | |
129 | { | |
130 | if (object == nil || variable == NULL) | |
131 | return nil; | |
132 | else | |
133 | { | |
134 | char *location = (char *)object + variable->ivar_offset; | |
135 | ||
136 | return *((id *)location); | |
137 | } | |
138 | } | |
139 | ||
140 | void object_setIvar (id object, struct objc_ivar * variable, id value) | |
141 | { | |
142 | if (object == nil || variable == NULL) | |
143 | return; | |
144 | else | |
145 | { | |
146 | char *location = (char *)object + variable->ivar_offset; | |
147 | ||
148 | *((id *)location) = value; | |
149 | } | |
150 | } | |
151 | ||
152 | const char * ivar_getName (struct objc_ivar * variable) | |
153 | { | |
ad9eef11 NP |
154 | if (variable == NULL) |
155 | return NULL; | |
156 | ||
fdcbbfe7 NP |
157 | return variable->ivar_name; |
158 | } | |
159 | ||
160 | ptrdiff_t ivar_getOffset (struct objc_ivar * variable) | |
161 | { | |
ad9eef11 NP |
162 | if (variable == NULL) |
163 | return 0; | |
164 | ||
fdcbbfe7 NP |
165 | return (ptrdiff_t)(variable->ivar_offset); |
166 | } | |
167 | ||
168 | const char * ivar_getTypeEncoding (struct objc_ivar * variable) | |
169 | { | |
ad9eef11 NP |
170 | if (variable == NULL) |
171 | return NULL; | |
172 | ||
fdcbbfe7 NP |
173 | return variable->ivar_type; |
174 | } | |
ad9eef11 NP |
175 | |
176 | struct objc_ivar ** class_copyIvarList (Class class_, unsigned int *numberOfReturnedIvars) | |
177 | { | |
178 | unsigned int count = 0; | |
179 | struct objc_ivar **returnValue = NULL; | |
180 | struct objc_ivar_list* ivar_list; | |
181 | ||
6c5c7efd | 182 | if (class_ == Nil || CLS_IS_IN_CONSTRUCTION (class_)) |
ad9eef11 NP |
183 | { |
184 | if (numberOfReturnedIvars) | |
185 | *numberOfReturnedIvars = 0; | |
186 | return NULL; | |
187 | } | |
6c5c7efd | 188 | |
ad9eef11 NP |
189 | /* Count how many ivars we have. */ |
190 | ivar_list = class_->ivars; | |
191 | count = ivar_list->ivar_count; | |
192 | ||
193 | if (count != 0) | |
194 | { | |
195 | unsigned int i = 0; | |
196 | ||
197 | /* Allocate enough memory to hold them. */ | |
198 | returnValue = (struct objc_ivar **)(malloc (sizeof (struct objc_ivar *) * (count + 1))); | |
199 | ||
200 | /* Copy the ivars. */ | |
201 | for (i = 0; i < count; i++) | |
575584a9 | 202 | returnValue[i] = &(ivar_list->ivar_list[i]); |
ad9eef11 NP |
203 | |
204 | returnValue[i] = NULL; | |
205 | } | |
206 | ||
ad9eef11 NP |
207 | if (numberOfReturnedIvars) |
208 | *numberOfReturnedIvars = count; | |
209 | ||
210 | return returnValue; | |
211 | } | |
8437e063 | 212 | |
6c5c7efd NP |
213 | BOOL |
214 | class_addIvar (Class class_, const char * ivar_name, size_t size, | |
410644c4 | 215 | unsigned char log_2_of_alignment, const char *type) |
6c5c7efd NP |
216 | { |
217 | struct objc_ivar_list *ivars; | |
218 | ||
219 | if (class_ == Nil | |
220 | || (! CLS_IS_IN_CONSTRUCTION (class_)) | |
221 | || ivar_name == NULL | |
222 | || (strcmp (ivar_name, "") == 0) | |
223 | || size == 0 | |
224 | || type == NULL) | |
225 | return NO; | |
226 | ||
227 | /* Check if the class has an instance variable with that name | |
228 | already. */ | |
229 | ivars = class_->ivars; | |
230 | ||
231 | if (ivars != NULL) | |
232 | { | |
233 | int i; | |
234 | ||
235 | for (i = 0; i < ivars->ivar_count; i++) | |
236 | { | |
237 | struct objc_ivar *ivar = &(ivars->ivar_list[i]); | |
238 | ||
239 | if (strcmp (ivar->ivar_name, ivar_name) == 0) | |
575584a9 | 240 | return NO; |
6c5c7efd NP |
241 | } |
242 | } | |
243 | ||
244 | /* Ok, no direct ivars. Check superclasses. */ | |
245 | if (class_getInstanceVariable (objc_getClass ((char *)(class_->super_class)), | |
246 | ivar_name)) | |
247 | return NO; | |
248 | ||
249 | /* Good. Create space for the new instance variable. */ | |
250 | if (ivars) | |
251 | { | |
252 | int ivar_count = ivars->ivar_count + 1; | |
253 | int new_size = sizeof (struct objc_ivar_list) | |
254 | + (ivar_count - 1) * sizeof (struct objc_ivar); | |
255 | ||
256 | ivars = (struct objc_ivar_list*) objc_realloc (ivars, new_size); | |
257 | ivars->ivar_count = ivar_count; | |
258 | class_->ivars = ivars; | |
259 | } | |
260 | else | |
261 | { | |
262 | int new_size = sizeof (struct objc_ivar_list); | |
263 | ||
264 | ivars = (struct objc_ivar_list*) objc_malloc (new_size); | |
265 | ivars->ivar_count = 1; | |
266 | class_->ivars = ivars; | |
267 | } | |
268 | ||
269 | /* Now ivars is set to a list of instance variables of the right | |
270 | size. */ | |
271 | { | |
272 | struct objc_ivar *ivar = &(ivars->ivar_list[ivars->ivar_count - 1]); | |
410644c4 | 273 | unsigned int alignment = 1 << log_2_of_alignment; |
6c5c7efd NP |
274 | int misalignment; |
275 | ||
276 | ivar->ivar_name = objc_malloc (strlen (ivar_name) + 1); | |
277 | strcpy ((char *)ivar->ivar_name, ivar_name); | |
278 | ||
279 | ivar->ivar_type = objc_malloc (strlen (type) + 1); | |
280 | strcpy ((char *)ivar->ivar_type, type); | |
281 | ||
282 | /* The new instance variable is placed at the end of the existing | |
283 | instance_size, at the first byte that is aligned with | |
284 | alignment. */ | |
285 | misalignment = class_->instance_size % alignment; | |
286 | ||
287 | if (misalignment == 0) | |
288 | ivar->ivar_offset = class_->instance_size; | |
289 | else | |
290 | ivar->ivar_offset = class_->instance_size - misalignment + alignment; | |
291 | ||
3db1a28c | 292 | class_->instance_size = ivar->ivar_offset + size; |
6c5c7efd NP |
293 | } |
294 | ||
295 | return YES; | |
296 | } | |
297 | ||
298 | ||
8437e063 NP |
299 | const char * |
300 | property_getName (struct objc_property * property __attribute__ ((__unused__))) | |
301 | { | |
302 | if (property == NULL) | |
303 | return NULL; | |
304 | ||
305 | /* TODO: New ABI. */ | |
306 | /* The current ABI does not have any information on properties. */ | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | const char * | |
311 | property_getAttributes (struct objc_property * property __attribute__ ((__unused__))) | |
312 | { | |
313 | if (property == NULL) | |
314 | return NULL; | |
315 | ||
316 | /* TODO: New ABI. */ | |
317 | /* The current ABI does not have any information on properties. */ | |
318 | return NULL; | |
319 | } | |
320 | ||
321 | struct objc_property * | |
322 | class_getProperty (Class class_ __attribute__ ((__unused__)), | |
323 | const char *propertyName __attribute__ ((__unused__))) | |
324 | { | |
325 | if (class_ == NULL || propertyName == NULL) | |
326 | return NULL; | |
327 | ||
328 | /* TODO: New ABI. */ | |
329 | /* The current ABI does not have any information on class properties. */ | |
330 | return NULL; | |
331 | } | |
332 | ||
333 | struct objc_property ** | |
334 | class_copyPropertyList (Class class_ __attribute__ ((__unused__)), | |
335 | unsigned int *numberOfReturnedProperties __attribute__ ((__unused__))) | |
336 | { | |
337 | if (class_ == Nil) | |
338 | { | |
339 | if (numberOfReturnedProperties) | |
340 | *numberOfReturnedProperties = 0; | |
341 | return NULL; | |
342 | } | |
343 | ||
344 | /* TODO: New ABI. */ | |
345 | /* The current ABI does not have any information on class properties. */ | |
346 | if (numberOfReturnedProperties) | |
347 | *numberOfReturnedProperties = 0; | |
348 | ||
349 | return NULL; | |
350 | } | |
3c44c190 NP |
351 | |
352 | const char * | |
353 | class_getIvarLayout (Class class_ __attribute__ ((__unused__))) | |
354 | { | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | const char * | |
359 | class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__))) | |
360 | { | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | void | |
365 | class_setIvarLayout (Class class_ __attribute__ ((__unused__)), | |
366 | const char *layout __attribute__ ((__unused__))) | |
367 | { | |
368 | return; | |
369 | } | |
370 | ||
371 | void | |
372 | class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)), | |
373 | const char *layout __attribute__ ((__unused__))) | |
374 | { | |
375 | return; | |
376 | } |