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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 NP |
29 | #include "objc-private/runtime.h" /* the kitchen sink */ |
30 | #include <string.h> /* For strcmp */ | |
fdcbbfe7 NP |
31 | |
32 | struct objc_ivar * | |
33 | class_getInstanceVariable (Class class_, const char *name) | |
34 | { | |
6c5c7efd | 35 | if (class_ != Nil && name != NULL && ! CLS_IS_IN_CONSTRUCTION (class_)) |
fdcbbfe7 | 36 | { |
fdcbbfe7 NP |
37 | while (class_ != Nil) |
38 | { | |
39 | struct objc_ivar_list *ivars = class_->ivars; | |
40 | if (ivars != NULL) | |
41 | { | |
42 | int i; | |
43 | ||
44 | for (i = 0; i < ivars->ivar_count; i++) | |
45 | { | |
46 | struct objc_ivar *ivar = &(ivars->ivar_list[i]); | |
47 | ||
48 | if (!strcmp (ivar->ivar_name, name)) | |
49 | { | |
fdcbbfe7 NP |
50 | return ivar; |
51 | } | |
52 | } | |
53 | } | |
1cde73d7 | 54 | class_ = class_getSuperclass (class_); |
fdcbbfe7 | 55 | } |
fdcbbfe7 NP |
56 | } |
57 | return NULL; | |
58 | } | |
59 | ||
be05b0f5 NP |
60 | struct objc_ivar * |
61 | class_getClassVariable (Class class_, const char *name) | |
62 | { | |
63 | if (class_ == Nil) | |
64 | return NULL; | |
65 | ||
66 | /* Logically, since a class is an instance of its meta-class, and | |
67 | since its class methods are the instance methods of the | |
68 | meta-class, class variables should be instance variables of the | |
69 | meta-class. That is different from the normal use of having | |
70 | 'static' variables in the class implementation file, because | |
71 | every class would have its own variables. | |
72 | ||
73 | Anyway, it is all speculative at this stage, but if we get class | |
74 | variables in Objective-C, it is conceivable that this | |
75 | implementation should work. */ | |
76 | return class_getInstanceVariable (class_->class_pointer, name); | |
77 | } | |
78 | ||
fdcbbfe7 NP |
79 | void * |
80 | object_getIndexedIvars (id object) | |
81 | { | |
82 | if (object == nil) | |
83 | return NULL; | |
84 | else | |
85 | { | |
86 | return (void *)(((char *)object) | |
87 | + object->class_pointer->instance_size); | |
88 | } | |
89 | } | |
90 | ||
91 | struct objc_ivar * | |
92 | object_getInstanceVariable (id object, const char *name, void **returnValue) | |
93 | { | |
94 | if (object == nil || name == NULL) | |
95 | return NULL; | |
96 | else | |
97 | { | |
98 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
99 | ||
100 | if (variable != NULL && returnValue != NULL) | |
101 | { | |
102 | char *location = (char *)object + variable->ivar_offset; | |
103 | ||
104 | *returnValue = *((id *)location); | |
105 | } | |
106 | ||
107 | return variable; | |
108 | } | |
109 | } | |
110 | ||
111 | struct objc_ivar * | |
112 | object_setInstanceVariable (id object, const char *name, void *newValue) | |
113 | { | |
114 | if (object == nil || name == NULL) | |
115 | return NULL; | |
116 | else | |
117 | { | |
118 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
119 | ||
120 | if (variable != NULL) | |
121 | { | |
122 | char *location = (char *)object + variable->ivar_offset; | |
123 | ||
124 | *((id *)location) = (id)newValue; | |
125 | } | |
126 | ||
127 | return variable; | |
128 | } | |
129 | } | |
130 | ||
131 | id object_getIvar (id object, struct objc_ivar * variable) | |
132 | { | |
133 | if (object == nil || variable == NULL) | |
134 | return nil; | |
135 | else | |
136 | { | |
137 | char *location = (char *)object + variable->ivar_offset; | |
138 | ||
139 | return *((id *)location); | |
140 | } | |
141 | } | |
142 | ||
143 | void object_setIvar (id object, struct objc_ivar * variable, id value) | |
144 | { | |
145 | if (object == nil || variable == NULL) | |
146 | return; | |
147 | else | |
148 | { | |
149 | char *location = (char *)object + variable->ivar_offset; | |
150 | ||
151 | *((id *)location) = value; | |
152 | } | |
153 | } | |
154 | ||
155 | const char * ivar_getName (struct objc_ivar * variable) | |
156 | { | |
ad9eef11 NP |
157 | if (variable == NULL) |
158 | return NULL; | |
159 | ||
fdcbbfe7 NP |
160 | return variable->ivar_name; |
161 | } | |
162 | ||
163 | ptrdiff_t ivar_getOffset (struct objc_ivar * variable) | |
164 | { | |
ad9eef11 NP |
165 | if (variable == NULL) |
166 | return 0; | |
167 | ||
fdcbbfe7 NP |
168 | return (ptrdiff_t)(variable->ivar_offset); |
169 | } | |
170 | ||
171 | const char * ivar_getTypeEncoding (struct objc_ivar * variable) | |
172 | { | |
ad9eef11 NP |
173 | if (variable == NULL) |
174 | return NULL; | |
175 | ||
fdcbbfe7 NP |
176 | return variable->ivar_type; |
177 | } | |
ad9eef11 NP |
178 | |
179 | struct objc_ivar ** class_copyIvarList (Class class_, unsigned int *numberOfReturnedIvars) | |
180 | { | |
181 | unsigned int count = 0; | |
182 | struct objc_ivar **returnValue = NULL; | |
183 | struct objc_ivar_list* ivar_list; | |
184 | ||
6c5c7efd | 185 | if (class_ == Nil || CLS_IS_IN_CONSTRUCTION (class_)) |
ad9eef11 NP |
186 | { |
187 | if (numberOfReturnedIvars) | |
188 | *numberOfReturnedIvars = 0; | |
189 | return NULL; | |
190 | } | |
6c5c7efd | 191 | |
ad9eef11 NP |
192 | /* Count how many ivars we have. */ |
193 | ivar_list = class_->ivars; | |
194 | count = ivar_list->ivar_count; | |
195 | ||
196 | if (count != 0) | |
197 | { | |
198 | unsigned int i = 0; | |
199 | ||
200 | /* Allocate enough memory to hold them. */ | |
201 | returnValue = (struct objc_ivar **)(malloc (sizeof (struct objc_ivar *) * (count + 1))); | |
202 | ||
203 | /* Copy the ivars. */ | |
204 | for (i = 0; i < count; i++) | |
205 | { | |
206 | returnValue[i] = &(ivar_list->ivar_list[i]); | |
207 | } | |
208 | ||
209 | returnValue[i] = NULL; | |
210 | } | |
211 | ||
ad9eef11 NP |
212 | if (numberOfReturnedIvars) |
213 | *numberOfReturnedIvars = count; | |
214 | ||
215 | return returnValue; | |
216 | } | |
8437e063 | 217 | |
6c5c7efd NP |
218 | BOOL |
219 | class_addIvar (Class class_, const char * ivar_name, size_t size, | |
220 | unsigned char alignment, const char *type) | |
221 | { | |
222 | struct objc_ivar_list *ivars; | |
223 | ||
224 | if (class_ == Nil | |
225 | || (! CLS_IS_IN_CONSTRUCTION (class_)) | |
226 | || ivar_name == NULL | |
227 | || (strcmp (ivar_name, "") == 0) | |
228 | || size == 0 | |
229 | || type == NULL) | |
230 | return NO; | |
231 | ||
232 | /* Check if the class has an instance variable with that name | |
233 | already. */ | |
234 | ivars = class_->ivars; | |
235 | ||
236 | if (ivars != NULL) | |
237 | { | |
238 | int i; | |
239 | ||
240 | for (i = 0; i < ivars->ivar_count; i++) | |
241 | { | |
242 | struct objc_ivar *ivar = &(ivars->ivar_list[i]); | |
243 | ||
244 | if (strcmp (ivar->ivar_name, ivar_name) == 0) | |
245 | { | |
246 | return NO; | |
247 | } | |
248 | } | |
249 | } | |
250 | ||
251 | /* Ok, no direct ivars. Check superclasses. */ | |
252 | if (class_getInstanceVariable (objc_getClass ((char *)(class_->super_class)), | |
253 | ivar_name)) | |
254 | return NO; | |
255 | ||
256 | /* Good. Create space for the new instance variable. */ | |
257 | if (ivars) | |
258 | { | |
259 | int ivar_count = ivars->ivar_count + 1; | |
260 | int new_size = sizeof (struct objc_ivar_list) | |
261 | + (ivar_count - 1) * sizeof (struct objc_ivar); | |
262 | ||
263 | ivars = (struct objc_ivar_list*) objc_realloc (ivars, new_size); | |
264 | ivars->ivar_count = ivar_count; | |
265 | class_->ivars = ivars; | |
266 | } | |
267 | else | |
268 | { | |
269 | int new_size = sizeof (struct objc_ivar_list); | |
270 | ||
271 | ivars = (struct objc_ivar_list*) objc_malloc (new_size); | |
272 | ivars->ivar_count = 1; | |
273 | class_->ivars = ivars; | |
274 | } | |
275 | ||
276 | /* Now ivars is set to a list of instance variables of the right | |
277 | size. */ | |
278 | { | |
279 | struct objc_ivar *ivar = &(ivars->ivar_list[ivars->ivar_count - 1]); | |
280 | int misalignment; | |
281 | ||
282 | ivar->ivar_name = objc_malloc (strlen (ivar_name) + 1); | |
283 | strcpy ((char *)ivar->ivar_name, ivar_name); | |
284 | ||
285 | ivar->ivar_type = objc_malloc (strlen (type) + 1); | |
286 | strcpy ((char *)ivar->ivar_type, type); | |
287 | ||
288 | /* The new instance variable is placed at the end of the existing | |
289 | instance_size, at the first byte that is aligned with | |
290 | alignment. */ | |
291 | misalignment = class_->instance_size % alignment; | |
292 | ||
293 | if (misalignment == 0) | |
294 | ivar->ivar_offset = class_->instance_size; | |
295 | else | |
296 | ivar->ivar_offset = class_->instance_size - misalignment + alignment; | |
297 | ||
298 | class_->instance_size = ivar->ivar_offset + objc_sizeof_type (ivar->ivar_type); | |
299 | } | |
300 | ||
301 | return YES; | |
302 | } | |
303 | ||
304 | ||
8437e063 NP |
305 | const char * |
306 | property_getName (struct objc_property * property __attribute__ ((__unused__))) | |
307 | { | |
308 | if (property == NULL) | |
309 | return NULL; | |
310 | ||
311 | /* TODO: New ABI. */ | |
312 | /* The current ABI does not have any information on properties. */ | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | const char * | |
317 | property_getAttributes (struct objc_property * property __attribute__ ((__unused__))) | |
318 | { | |
319 | if (property == NULL) | |
320 | return NULL; | |
321 | ||
322 | /* TODO: New ABI. */ | |
323 | /* The current ABI does not have any information on properties. */ | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | struct objc_property * | |
328 | class_getProperty (Class class_ __attribute__ ((__unused__)), | |
329 | const char *propertyName __attribute__ ((__unused__))) | |
330 | { | |
331 | if (class_ == NULL || propertyName == NULL) | |
332 | return NULL; | |
333 | ||
334 | /* TODO: New ABI. */ | |
335 | /* The current ABI does not have any information on class properties. */ | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | struct objc_property ** | |
340 | class_copyPropertyList (Class class_ __attribute__ ((__unused__)), | |
341 | unsigned int *numberOfReturnedProperties __attribute__ ((__unused__))) | |
342 | { | |
343 | if (class_ == Nil) | |
344 | { | |
345 | if (numberOfReturnedProperties) | |
346 | *numberOfReturnedProperties = 0; | |
347 | return NULL; | |
348 | } | |
349 | ||
350 | /* TODO: New ABI. */ | |
351 | /* The current ABI does not have any information on class properties. */ | |
352 | if (numberOfReturnedProperties) | |
353 | *numberOfReturnedProperties = 0; | |
354 | ||
355 | return NULL; | |
356 | } | |
3c44c190 NP |
357 | |
358 | const char * | |
359 | class_getIvarLayout (Class class_ __attribute__ ((__unused__))) | |
360 | { | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | const char * | |
365 | class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__))) | |
366 | { | |
367 | return NULL; | |
368 | } | |
369 | ||
370 | void | |
371 | class_setIvarLayout (Class class_ __attribute__ ((__unused__)), | |
372 | const char *layout __attribute__ ((__unused__))) | |
373 | { | |
374 | return; | |
375 | } | |
376 | ||
377 | void | |
378 | class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)), | |
379 | const char *layout __attribute__ ((__unused__))) | |
380 | { | |
381 | return; | |
382 | } |