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ad9eef11 NP |
1 | /* GNU Objective C Runtime method 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/runtime.h" | |
27 | #include "objc-private/module-abi-8.h" /* For runtime structures. */ | |
28 | #include "objc/thr.h" | |
29 | #include "objc-private/runtime.h" /* For __objc_runtime_mutex. */ | |
30 | #include <stdlib.h> /* For malloc. */ | |
31 | ||
ad49efbd NP |
32 | SEL |
33 | method_getName (struct objc_method * method) | |
ad9eef11 NP |
34 | { |
35 | if (method == NULL) | |
36 | return NULL; | |
37 | ||
38 | return method->method_name; | |
39 | } | |
40 | ||
ad49efbd NP |
41 | const char * |
42 | method_getTypeEncoding (struct objc_method * method) | |
ad9eef11 NP |
43 | { |
44 | if (method == NULL) | |
45 | return NULL; | |
46 | ||
47 | return method->method_types; | |
48 | } | |
49 | ||
ad49efbd NP |
50 | IMP |
51 | method_getImplementation (struct objc_method * method) | |
ad9eef11 NP |
52 | { |
53 | if (method == NULL) | |
54 | return NULL; | |
55 | ||
56 | return method->method_imp; | |
57 | } | |
58 | ||
ad49efbd NP |
59 | struct objc_method_description * |
60 | method_getDescription (struct objc_method * method) | |
61 | { | |
62 | /* Note that the following returns NULL if method is NULL, which is | |
63 | fine. */ | |
64 | return (struct objc_method_description *)method; | |
65 | } | |
66 | ||
67 | struct objc_method ** | |
68 | class_copyMethodList (Class class_, unsigned int *numberOfReturnedMethods) | |
ad9eef11 NP |
69 | { |
70 | unsigned int count = 0; | |
71 | struct objc_method **returnValue = NULL; | |
72 | struct objc_method_list* method_list; | |
73 | ||
74 | if (class_ == Nil) | |
75 | { | |
76 | if (numberOfReturnedMethods) | |
77 | *numberOfReturnedMethods = 0; | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | /* Lock the runtime mutex because the class methods may be | |
82 | concurrently modified. */ | |
83 | objc_mutex_lock (__objc_runtime_mutex); | |
84 | ||
85 | /* Count how many methods we have. */ | |
86 | method_list = class_->methods; | |
87 | ||
88 | while (method_list) | |
89 | { | |
90 | count = count + method_list->method_count; | |
91 | method_list = method_list->method_next; | |
92 | } | |
93 | ||
94 | if (count != 0) | |
95 | { | |
96 | unsigned int i = 0; | |
97 | ||
98 | /* Allocate enough memory to hold them. */ | |
99 | returnValue | |
100 | = (struct objc_method **)(malloc (sizeof (struct objc_method *) | |
101 | * (count + 1))); | |
102 | ||
103 | /* Copy the methods. */ | |
104 | method_list = class_->methods; | |
105 | ||
106 | while (method_list) | |
107 | { | |
108 | int j; | |
109 | for (j = 0; j < method_list->method_count; j++) | |
110 | { | |
111 | returnValue[i] = &(method_list->method_list[j]); | |
112 | i++; | |
113 | } | |
114 | method_list = method_list->method_next; | |
115 | } | |
116 | ||
117 | returnValue[i] = NULL; | |
118 | } | |
119 | ||
120 | objc_mutex_unlock (__objc_runtime_mutex); | |
121 | ||
122 | if (numberOfReturnedMethods) | |
123 | *numberOfReturnedMethods = count; | |
124 | ||
125 | return returnValue; | |
126 | } | |
51194e8e NP |
127 | |
128 | IMP | |
129 | method_setImplementation (struct objc_method * method, IMP implementation) | |
130 | { | |
131 | IMP old_implementation; | |
132 | ||
133 | if (method == NULL || implementation == NULL) | |
134 | return NULL; | |
135 | ||
136 | /* We lock the runtime mutex so that concurrent calls to change the | |
137 | same method won't conflict with each other. */ | |
138 | objc_mutex_lock (__objc_runtime_mutex); | |
139 | ||
140 | old_implementation = method->method_imp; | |
141 | method->method_imp = implementation; | |
142 | ||
143 | /* That was easy :-). But now we need to find all classes that use | |
144 | this method, and update the IMP in the dispatch tables. */ | |
145 | __objc_update_classes_with_methods (method, NULL); | |
146 | ||
147 | objc_mutex_unlock (__objc_runtime_mutex); | |
148 | ||
149 | return old_implementation; | |
150 | } | |
151 | ||
152 | void | |
153 | method_exchangeImplementations (struct objc_method * method_a, struct objc_method * method_b) | |
154 | { | |
155 | IMP old_implementation_a; | |
156 | IMP old_implementation_b; | |
157 | ||
158 | if (method_a == NULL || method_b == NULL) | |
159 | return; | |
160 | ||
161 | /* We lock the runtime mutex so that concurrent calls to exchange | |
162 | similar methods won't conflict with each other. Each of them | |
163 | should be atomic. */ | |
164 | objc_mutex_lock (__objc_runtime_mutex); | |
165 | ||
166 | old_implementation_a = method_a->method_imp; | |
167 | old_implementation_b = method_b->method_imp; | |
168 | ||
169 | method_a->method_imp = old_implementation_b; | |
170 | method_b->method_imp = old_implementation_a; | |
171 | ||
172 | /* That was easy :-). But now we need to find all classes that use | |
173 | these methods, and update the IMP in the dispatch tables. */ | |
174 | __objc_update_classes_with_methods (method_a, method_b); | |
175 | ||
176 | objc_mutex_unlock (__objc_runtime_mutex); | |
177 | } |