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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" | |
26 | #include "objc/objc.h" | |
27 | #include "objc/objc-api.h" | |
28 | #include "objc-private/runtime.h" /* the kitchen sink */ | |
29 | #include <string.h> /* For strcmp */ | |
30 | ||
31 | struct objc_ivar * | |
32 | class_getInstanceVariable (Class class_, const char *name) | |
33 | { | |
34 | if (class_ != Nil && name != NULL) | |
35 | { | |
36 | objc_mutex_lock (__objc_runtime_mutex); | |
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 | { | |
50 | objc_mutex_unlock (__objc_runtime_mutex); | |
51 | return ivar; | |
52 | } | |
53 | } | |
54 | } | |
55 | class_ = class_->super_class; | |
56 | } | |
57 | objc_mutex_unlock (__objc_runtime_mutex); | |
58 | } | |
59 | return NULL; | |
60 | } | |
61 | ||
62 | void * | |
63 | object_getIndexedIvars (id object) | |
64 | { | |
65 | if (object == nil) | |
66 | return NULL; | |
67 | else | |
68 | { | |
69 | return (void *)(((char *)object) | |
70 | + object->class_pointer->instance_size); | |
71 | } | |
72 | } | |
73 | ||
74 | struct objc_ivar * | |
75 | object_getInstanceVariable (id object, const char *name, void **returnValue) | |
76 | { | |
77 | if (object == nil || name == NULL) | |
78 | return NULL; | |
79 | else | |
80 | { | |
81 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
82 | ||
83 | if (variable != NULL && returnValue != NULL) | |
84 | { | |
85 | char *location = (char *)object + variable->ivar_offset; | |
86 | ||
87 | *returnValue = *((id *)location); | |
88 | } | |
89 | ||
90 | return variable; | |
91 | } | |
92 | } | |
93 | ||
94 | struct objc_ivar * | |
95 | object_setInstanceVariable (id object, const char *name, void *newValue) | |
96 | { | |
97 | if (object == nil || name == NULL) | |
98 | return NULL; | |
99 | else | |
100 | { | |
101 | struct objc_ivar * variable = class_getInstanceVariable (object->class_pointer, name); | |
102 | ||
103 | if (variable != NULL) | |
104 | { | |
105 | char *location = (char *)object + variable->ivar_offset; | |
106 | ||
107 | *((id *)location) = (id)newValue; | |
108 | } | |
109 | ||
110 | return variable; | |
111 | } | |
112 | } | |
113 | ||
114 | id object_getIvar (id object, struct objc_ivar * variable) | |
115 | { | |
116 | if (object == nil || variable == NULL) | |
117 | return nil; | |
118 | else | |
119 | { | |
120 | char *location = (char *)object + variable->ivar_offset; | |
121 | ||
122 | return *((id *)location); | |
123 | } | |
124 | } | |
125 | ||
126 | void object_setIvar (id object, struct objc_ivar * variable, id value) | |
127 | { | |
128 | if (object == nil || variable == NULL) | |
129 | return; | |
130 | else | |
131 | { | |
132 | char *location = (char *)object + variable->ivar_offset; | |
133 | ||
134 | *((id *)location) = value; | |
135 | } | |
136 | } | |
137 | ||
138 | const char * ivar_getName (struct objc_ivar * variable) | |
139 | { | |
140 | return variable->ivar_name; | |
141 | } | |
142 | ||
143 | ptrdiff_t ivar_getOffset (struct objc_ivar * variable) | |
144 | { | |
145 | return (ptrdiff_t)(variable->ivar_offset); | |
146 | } | |
147 | ||
148 | const char * ivar_getTypeEncoding (struct objc_ivar * variable) | |
149 | { | |
150 | return variable->ivar_type; | |
151 | } |