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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)) | |
50 | { | |
fdcbbfe7 NP |
51 | return ivar; |
52 | } | |
53 | } | |
54 | } | |
1cde73d7 | 55 | class_ = class_getSuperclass (class_); |
fdcbbfe7 | 56 | } |
fdcbbfe7 NP |
57 | } |
58 | return NULL; | |
59 | } | |
60 | ||
be05b0f5 NP |
61 | struct objc_ivar * |
62 | class_getClassVariable (Class class_, const char *name) | |
63 | { | |
64 | if (class_ == Nil) | |
65 | return NULL; | |
66 | ||
67 | /* Logically, since a class is an instance of its meta-class, and | |
68 | since its class methods are the instance methods of the | |
69 | meta-class, class variables should be instance variables of the | |
70 | meta-class. That is different from the normal use of having | |
71 | 'static' variables in the class implementation file, because | |
72 | every class would have its own variables. | |
73 | ||
74 | Anyway, it is all speculative at this stage, but if we get class | |
75 | variables in Objective-C, it is conceivable that this | |
76 | implementation should work. */ | |
77 | return class_getInstanceVariable (class_->class_pointer, name); | |
78 | } | |
79 | ||
fdcbbfe7 NP |
80 | void * |
81 | object_getIndexedIvars (id object) | |
82 | { | |
83 | if (object == nil) | |
84 | return NULL; | |
85 | else | |
86 | { | |
87 | return (void *)(((char *)object) | |
88 | + object->class_pointer->instance_size); | |
89 | } | |
90 | } | |
91 | ||
92 | struct objc_ivar * | |
93 | object_getInstanceVariable (id object, const char *name, void **returnValue) | |
94 | { | |
95 | if (object == nil || name == NULL) | |
96 | return NULL; | |
97 | else | |
98 | { | |
99 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
100 | ||
101 | if (variable != NULL && returnValue != NULL) | |
102 | { | |
103 | char *location = (char *)object + variable->ivar_offset; | |
104 | ||
105 | *returnValue = *((id *)location); | |
106 | } | |
107 | ||
108 | return variable; | |
109 | } | |
110 | } | |
111 | ||
112 | struct objc_ivar * | |
113 | object_setInstanceVariable (id object, const char *name, void *newValue) | |
114 | { | |
115 | if (object == nil || name == NULL) | |
116 | return NULL; | |
117 | else | |
118 | { | |
119 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
120 | ||
121 | if (variable != NULL) | |
122 | { | |
123 | char *location = (char *)object + variable->ivar_offset; | |
124 | ||
125 | *((id *)location) = (id)newValue; | |
126 | } | |
127 | ||
128 | return variable; | |
129 | } | |
130 | } | |
131 | ||
132 | id object_getIvar (id object, struct objc_ivar * variable) | |
133 | { | |
134 | if (object == nil || variable == NULL) | |
135 | return nil; | |
136 | else | |
137 | { | |
138 | char *location = (char *)object + variable->ivar_offset; | |
139 | ||
140 | return *((id *)location); | |
141 | } | |
142 | } | |
143 | ||
144 | void object_setIvar (id object, struct objc_ivar * variable, id value) | |
145 | { | |
146 | if (object == nil || variable == NULL) | |
147 | return; | |
148 | else | |
149 | { | |
150 | char *location = (char *)object + variable->ivar_offset; | |
151 | ||
152 | *((id *)location) = value; | |
153 | } | |
154 | } | |
155 | ||
156 | const char * ivar_getName (struct objc_ivar * variable) | |
157 | { | |
ad9eef11 NP |
158 | if (variable == NULL) |
159 | return NULL; | |
160 | ||
fdcbbfe7 NP |
161 | return variable->ivar_name; |
162 | } | |
163 | ||
164 | ptrdiff_t ivar_getOffset (struct objc_ivar * variable) | |
165 | { | |
ad9eef11 NP |
166 | if (variable == NULL) |
167 | return 0; | |
168 | ||
fdcbbfe7 NP |
169 | return (ptrdiff_t)(variable->ivar_offset); |
170 | } | |
171 | ||
172 | const char * ivar_getTypeEncoding (struct objc_ivar * variable) | |
173 | { | |
ad9eef11 NP |
174 | if (variable == NULL) |
175 | return NULL; | |
176 | ||
fdcbbfe7 NP |
177 | return variable->ivar_type; |
178 | } | |
ad9eef11 NP |
179 | |
180 | struct objc_ivar ** class_copyIvarList (Class class_, unsigned int *numberOfReturnedIvars) | |
181 | { | |
182 | unsigned int count = 0; | |
183 | struct objc_ivar **returnValue = NULL; | |
184 | struct objc_ivar_list* ivar_list; | |
185 | ||
6c5c7efd | 186 | if (class_ == Nil || CLS_IS_IN_CONSTRUCTION (class_)) |
ad9eef11 NP |
187 | { |
188 | if (numberOfReturnedIvars) | |
189 | *numberOfReturnedIvars = 0; | |
190 | return NULL; | |
191 | } | |
6c5c7efd | 192 | |
ad9eef11 NP |
193 | /* Count how many ivars we have. */ |
194 | ivar_list = class_->ivars; | |
195 | count = ivar_list->ivar_count; | |
196 | ||
197 | if (count != 0) | |
198 | { | |
199 | unsigned int i = 0; | |
200 | ||
201 | /* Allocate enough memory to hold them. */ | |
202 | returnValue = (struct objc_ivar **)(malloc (sizeof (struct objc_ivar *) * (count + 1))); | |
203 | ||
204 | /* Copy the ivars. */ | |
205 | for (i = 0; i < count; i++) | |
206 | { | |
207 | returnValue[i] = &(ivar_list->ivar_list[i]); | |
208 | } | |
209 | ||
210 | returnValue[i] = NULL; | |
211 | } | |
212 | ||
ad9eef11 NP |
213 | if (numberOfReturnedIvars) |
214 | *numberOfReturnedIvars = count; | |
215 | ||
216 | return returnValue; | |
217 | } | |
8437e063 | 218 | |
6c5c7efd NP |
219 | BOOL |
220 | class_addIvar (Class class_, const char * ivar_name, size_t size, | |
221 | unsigned char alignment, const char *type) | |
222 | { | |
223 | struct objc_ivar_list *ivars; | |
224 | ||
225 | if (class_ == Nil | |
226 | || (! CLS_IS_IN_CONSTRUCTION (class_)) | |
227 | || ivar_name == NULL | |
228 | || (strcmp (ivar_name, "") == 0) | |
229 | || size == 0 | |
230 | || type == NULL) | |
231 | return NO; | |
232 | ||
233 | /* Check if the class has an instance variable with that name | |
234 | already. */ | |
235 | ivars = class_->ivars; | |
236 | ||
237 | if (ivars != NULL) | |
238 | { | |
239 | int i; | |
240 | ||
241 | for (i = 0; i < ivars->ivar_count; i++) | |
242 | { | |
243 | struct objc_ivar *ivar = &(ivars->ivar_list[i]); | |
244 | ||
245 | if (strcmp (ivar->ivar_name, ivar_name) == 0) | |
246 | { | |
247 | return NO; | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
252 | /* Ok, no direct ivars. Check superclasses. */ | |
253 | if (class_getInstanceVariable (objc_getClass ((char *)(class_->super_class)), | |
254 | ivar_name)) | |
255 | return NO; | |
256 | ||
257 | /* Good. Create space for the new instance variable. */ | |
258 | if (ivars) | |
259 | { | |
260 | int ivar_count = ivars->ivar_count + 1; | |
261 | int new_size = sizeof (struct objc_ivar_list) | |
262 | + (ivar_count - 1) * sizeof (struct objc_ivar); | |
263 | ||
264 | ivars = (struct objc_ivar_list*) objc_realloc (ivars, new_size); | |
265 | ivars->ivar_count = ivar_count; | |
266 | class_->ivars = ivars; | |
267 | } | |
268 | else | |
269 | { | |
270 | int new_size = sizeof (struct objc_ivar_list); | |
271 | ||
272 | ivars = (struct objc_ivar_list*) objc_malloc (new_size); | |
273 | ivars->ivar_count = 1; | |
274 | class_->ivars = ivars; | |
275 | } | |
276 | ||
277 | /* Now ivars is set to a list of instance variables of the right | |
278 | size. */ | |
279 | { | |
280 | struct objc_ivar *ivar = &(ivars->ivar_list[ivars->ivar_count - 1]); | |
281 | int misalignment; | |
282 | ||
283 | ivar->ivar_name = objc_malloc (strlen (ivar_name) + 1); | |
284 | strcpy ((char *)ivar->ivar_name, ivar_name); | |
285 | ||
286 | ivar->ivar_type = objc_malloc (strlen (type) + 1); | |
287 | strcpy ((char *)ivar->ivar_type, type); | |
288 | ||
289 | /* The new instance variable is placed at the end of the existing | |
290 | instance_size, at the first byte that is aligned with | |
291 | alignment. */ | |
292 | misalignment = class_->instance_size % alignment; | |
293 | ||
294 | if (misalignment == 0) | |
295 | ivar->ivar_offset = class_->instance_size; | |
296 | else | |
297 | ivar->ivar_offset = class_->instance_size - misalignment + alignment; | |
298 | ||
299 | class_->instance_size = ivar->ivar_offset + objc_sizeof_type (ivar->ivar_type); | |
300 | } | |
301 | ||
302 | return YES; | |
303 | } | |
304 | ||
305 | ||
8437e063 NP |
306 | const char * |
307 | property_getName (struct objc_property * property __attribute__ ((__unused__))) | |
308 | { | |
309 | if (property == NULL) | |
310 | return NULL; | |
311 | ||
312 | /* TODO: New ABI. */ | |
313 | /* The current ABI does not have any information on properties. */ | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | const char * | |
318 | property_getAttributes (struct objc_property * property __attribute__ ((__unused__))) | |
319 | { | |
320 | if (property == NULL) | |
321 | return NULL; | |
322 | ||
323 | /* TODO: New ABI. */ | |
324 | /* The current ABI does not have any information on properties. */ | |
325 | return NULL; | |
326 | } | |
327 | ||
328 | struct objc_property * | |
329 | class_getProperty (Class class_ __attribute__ ((__unused__)), | |
330 | const char *propertyName __attribute__ ((__unused__))) | |
331 | { | |
332 | if (class_ == NULL || propertyName == NULL) | |
333 | return NULL; | |
334 | ||
335 | /* TODO: New ABI. */ | |
336 | /* The current ABI does not have any information on class properties. */ | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | struct objc_property ** | |
341 | class_copyPropertyList (Class class_ __attribute__ ((__unused__)), | |
342 | unsigned int *numberOfReturnedProperties __attribute__ ((__unused__))) | |
343 | { | |
344 | if (class_ == Nil) | |
345 | { | |
346 | if (numberOfReturnedProperties) | |
347 | *numberOfReturnedProperties = 0; | |
348 | return NULL; | |
349 | } | |
350 | ||
351 | /* TODO: New ABI. */ | |
352 | /* The current ABI does not have any information on class properties. */ | |
353 | if (numberOfReturnedProperties) | |
354 | *numberOfReturnedProperties = 0; | |
355 | ||
356 | return NULL; | |
357 | } | |
3c44c190 NP |
358 | |
359 | const char * | |
360 | class_getIvarLayout (Class class_ __attribute__ ((__unused__))) | |
361 | { | |
362 | return NULL; | |
363 | } | |
364 | ||
365 | const char * | |
366 | class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__))) | |
367 | { | |
368 | return NULL; | |
369 | } | |
370 | ||
371 | void | |
372 | class_setIvarLayout (Class class_ __attribute__ ((__unused__)), | |
373 | const char *layout __attribute__ ((__unused__))) | |
374 | { | |
375 | return; | |
376 | } | |
377 | ||
378 | void | |
379 | class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)), | |
380 | const char *layout __attribute__ ((__unused__))) | |
381 | { | |
382 | return; | |
383 | } |