111
|
1 /* GNU Objective C Runtime ivar related functions.
|
131
|
2 Copyright (C) 2010-2018 Free Software Foundation, Inc.
|
111
|
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"
|
|
26 #include "objc/runtime.h"
|
|
27 #include "objc-private/module-abi-8.h" /* For runtime structures */
|
|
28 #include "objc/thr.h"
|
|
29 #include "objc-private/runtime.h" /* the kitchen sink */
|
|
30 #include <string.h> /* For strcmp. */
|
|
31 #include <stdlib.h> /* For malloc. */
|
|
32
|
|
33 struct objc_ivar *
|
|
34 class_getInstanceVariable (Class class_, const char *name)
|
|
35 {
|
|
36 if (class_ != Nil && name != NULL && ! CLS_IS_IN_CONSTRUCTION (class_))
|
|
37 {
|
|
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 return ivar;
|
|
51 }
|
|
52 }
|
|
53 class_ = class_getSuperclass (class_);
|
|
54 }
|
|
55 }
|
|
56 return NULL;
|
|
57 }
|
|
58
|
|
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
|
|
78 void *
|
|
79 object_getIndexedIvars (id object)
|
|
80 {
|
|
81 if (object == nil)
|
|
82 return NULL;
|
|
83 else
|
|
84 return (void *)(((char *)object)
|
|
85 + object->class_pointer->instance_size);
|
|
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 {
|
|
154 if (variable == NULL)
|
|
155 return NULL;
|
|
156
|
|
157 return variable->ivar_name;
|
|
158 }
|
|
159
|
|
160 ptrdiff_t ivar_getOffset (struct objc_ivar * variable)
|
|
161 {
|
|
162 if (variable == NULL)
|
|
163 return 0;
|
|
164
|
|
165 return (ptrdiff_t)(variable->ivar_offset);
|
|
166 }
|
|
167
|
|
168 const char * ivar_getTypeEncoding (struct objc_ivar * variable)
|
|
169 {
|
|
170 if (variable == NULL)
|
|
171 return NULL;
|
|
172
|
|
173 return variable->ivar_type;
|
|
174 }
|
|
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
|
|
182 if (class_ == Nil || CLS_IS_IN_CONSTRUCTION (class_) || !class_->ivars)
|
|
183 {
|
|
184 if (numberOfReturnedIvars)
|
|
185 *numberOfReturnedIvars = 0;
|
|
186 return NULL;
|
|
187 }
|
|
188
|
|
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++)
|
|
202 returnValue[i] = &(ivar_list->ivar_list[i]);
|
|
203
|
|
204 returnValue[i] = NULL;
|
|
205 }
|
|
206
|
|
207 if (numberOfReturnedIvars)
|
|
208 *numberOfReturnedIvars = count;
|
|
209
|
|
210 return returnValue;
|
|
211 }
|
|
212
|
|
213 BOOL
|
|
214 class_addIvar (Class class_, const char * ivar_name, size_t size,
|
|
215 unsigned char log_2_of_alignment, const char *type)
|
|
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)
|
|
240 return NO;
|
|
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]);
|
|
273 unsigned int alignment = 1 << log_2_of_alignment;
|
|
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
|
|
292 class_->instance_size = ivar->ivar_offset + size;
|
|
293 }
|
|
294
|
|
295 return YES;
|
|
296 }
|
|
297
|
|
298
|
|
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 }
|
|
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 }
|