1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/* GNU Objective C Runtime method related functions.
Copyright (C) 2010-2020 Free Software Foundation, Inc.
Contributed by Nicola Pero
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "objc-private/common.h"
#include "objc/runtime.h"
#include "objc-private/module-abi-8.h" /* For runtime structures. */
#include "objc/thr.h"
#include "objc-private/runtime.h" /* For __objc_runtime_mutex. */
#include <stdlib.h> /* For malloc. */
SEL
method_getName (struct objc_method * method)
{
if (method == NULL)
return NULL;
return method->method_name;
}
const char *
method_getTypeEncoding (struct objc_method * method)
{
if (method == NULL)
return NULL;
return method->method_types;
}
IMP
method_getImplementation (struct objc_method * method)
{
if (method == NULL)
return NULL;
return method->method_imp;
}
struct objc_method_description *
method_getDescription (struct objc_method * method)
{
/* Note that the following returns NULL if method is NULL, which is
fine. */
return (struct objc_method_description *)method;
}
struct objc_method **
class_copyMethodList (Class class_, unsigned int *numberOfReturnedMethods)
{
unsigned int count = 0;
struct objc_method **returnValue = NULL;
struct objc_method_list* method_list;
if (class_ == Nil)
{
if (numberOfReturnedMethods)
*numberOfReturnedMethods = 0;
return NULL;
}
/* Lock the runtime mutex because the class methods may be
concurrently modified. */
objc_mutex_lock (__objc_runtime_mutex);
/* Count how many methods we have. */
method_list = class_->methods;
while (method_list)
{
count = count + method_list->method_count;
method_list = method_list->method_next;
}
if (count != 0)
{
unsigned int i = 0;
/* Allocate enough memory to hold them. */
returnValue
= (struct objc_method **)(malloc (sizeof (struct objc_method *)
* (count + 1)));
/* Copy the methods. */
method_list = class_->methods;
while (method_list)
{
int j;
for (j = 0; j < method_list->method_count; j++)
{
returnValue[i] = &(method_list->method_list[j]);
i++;
}
method_list = method_list->method_next;
}
returnValue[i] = NULL;
}
objc_mutex_unlock (__objc_runtime_mutex);
if (numberOfReturnedMethods)
*numberOfReturnedMethods = count;
return returnValue;
}
IMP
method_setImplementation (struct objc_method * method, IMP implementation)
{
IMP old_implementation;
if (method == NULL || implementation == NULL)
return NULL;
/* We lock the runtime mutex so that concurrent calls to change the
same method won't conflict with each other. */
objc_mutex_lock (__objc_runtime_mutex);
old_implementation = method->method_imp;
method->method_imp = implementation;
/* That was easy :-). But now we need to find all classes that use
this method, and update the IMP in the dispatch tables. */
__objc_update_classes_with_methods (method, NULL);
objc_mutex_unlock (__objc_runtime_mutex);
return old_implementation;
}
void
method_exchangeImplementations (struct objc_method * method_a, struct objc_method * method_b)
{
IMP old_implementation_a;
IMP old_implementation_b;
if (method_a == NULL || method_b == NULL)
return;
/* We lock the runtime mutex so that concurrent calls to exchange
similar methods won't conflict with each other. Each of them
should be atomic. */
objc_mutex_lock (__objc_runtime_mutex);
old_implementation_a = method_a->method_imp;
old_implementation_b = method_b->method_imp;
method_a->method_imp = old_implementation_b;
method_b->method_imp = old_implementation_a;
/* That was easy :-). But now we need to find all classes that use
these methods, and update the IMP in the dispatch tables. */
__objc_update_classes_with_methods (method_a, method_b);
objc_mutex_unlock (__objc_runtime_mutex);
}
|
