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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* Test the Modern GNU Objective-C Runtime API.
This is test 'method', covering all functions starting with 'method'. */
/* { dg-do run } */
/* { dg-skip-if "No API#2 pre-Darwin9" { *-*-darwin[5-8]* } { "-fnext-runtime" } { "" } } */
/* { dg-xfail-run-if "Needs OBJC2 ABI" { *-*-darwin* && { lp64 && { ! objc2 } } } { "-fnext-runtime" } { "" } } */
/* To get the modern GNU Objective-C Runtime API, you include
objc/runtime.h. */
#include <objc/runtime.h>
#include <stdlib.h>
#include <iostream>
#include <cstring>
@interface MyRootClass
{ Class isa; }
+ alloc;
- init;
+ initialize;
@end
@implementation MyRootClass
+ alloc { return class_createInstance (self, 0); }
- init { return self; }
+ initialize { return self; }
@end
@protocol MyProtocol
- (id) variable;
@end
@protocol MySecondProtocol
- (id) setVariable: (id)value;
@end
@interface MySubClass : MyRootClass <MyProtocol>
{ id variable_ivar; }
- (void) setVariable: (id)value;
- (id) variable;
- (id) constant;
@end
@implementation MySubClass
- (void) setVariable: (id)value { variable_ivar = value; }
- (id) variable { return variable_ivar; }
- (id) constant { return nil; }
@end
int main ()
{
/* Functions are tested in alphabetical order. */
std::cout <<"Testing method_copyArgumentType () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (setVariable:));
char *type = method_copyArgumentType (method, 2);
if (type == NULL || type[0] != '@')
abort ();
}
std::cout << "Testing method_copyReturnType () ...\n";
{
Method method = class_getClassMethod (objc_getClass ("MyRootClass"),
@selector (alloc));
char *type = method_copyReturnType (method);
/* Check that it returns an object. */
if (type == NULL || type[0] != '@')
abort ();
}
std::cout << "Testing method_exchangeImplementations () ...\n";
{
Method method_a = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (variable));
Method method_b = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (constant));
MySubClass *object = [[MySubClass alloc] init];
/* Check that things work as expected before the swap. */
[object setVariable: object];
if ([object variable] != object || [object constant] != nil)
abort ();
/* Swap the methods. */
method_exchangeImplementations (method_a, method_b);
/* Check that behaviour has changed. */
if ([object variable] != nil || [object constant] != object)
abort ();
/* Swap the methods again. */
method_exchangeImplementations (method_a, method_b);
/* Check that behaviour is back to normal. */
if ([object variable] != object || [object constant] != nil)
abort ();
}
std::cout << "Testing method_getArgumentType () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MyRootClass"),
@selector (init));
char type[16];
method_getArgumentType (method, 1, type, 16);
/* Check the second argument (_cmd), which should be a SEL. */
if (type[0] != ':')
abort ();
}
std::cout << "Testing method_getDescription () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (variable));
struct objc_method_description *description = method_getDescription (method);
if (std::strcmp (sel_getName (description->name), "variable") != 0)
abort ();
if (method_getDescription (NULL) != NULL)
abort ();
}
std::cout << "Testing method_getImplementation () ...\n";
{
typedef void (*set_variable_function) (id receiver, SEL _cmd, id variable);
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (setVariable:));
set_variable_function imp;
MySubClass *object = [[MySubClass alloc] init];
imp = (set_variable_function)(method_getImplementation (method));
(*imp)(object, @selector (setVariable:), object);
if ([object variable] != object)
abort ();
}
std::cout << "Testing method_getName () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (setVariable:));
if (std::strcmp (sel_getName (method_getName (method)), "setVariable:") != 0)
abort ();
}
std::cout << "Testing method_getNumberOfArguments () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (setVariable:));
if (method_getNumberOfArguments (method) != 3)
abort ();
method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (variable));
if (method_getNumberOfArguments (method) != 2)
abort ();
}
std::cout << "Testing method_getTypeEncoding () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (setVariable:));
const char *types = method_getTypeEncoding (method);
/* Check that method type string starts with 'v' (void) */
if (types == NULL || types[0] != 'v')
abort ();
}
std::cout << "Testing method_getReturnType () ...\n";
{
Method method = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (setVariable:));
char type[16];
method_getReturnType (method, type, 16);
if (type[0] != 'v')
abort ();
method_getReturnType (NULL, type, 16);
if (type[0] != 0)
abort ();
}
std::cout << "Testing method_setImplementation () ...\n";
{
Method method_a = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (variable));
Method method_b = class_getInstanceMethod (objc_getClass ("MySubClass"),
@selector (constant));
IMP original_imp_a = method_getImplementation (method_a);
IMP original_imp_b = method_getImplementation (method_b);
MySubClass *object = [[MySubClass alloc] init];
/* Check that things work as expected before the swap. */
[object setVariable: object];
if ([object variable] != object || [object constant] != nil)
abort ();
/* Have 'variable' use the same implementation as 'constant'. */
if (method_setImplementation (method_a, original_imp_b) != original_imp_a)
abort ();
/* Check that behaviour has changed. */
if ([object variable] != nil || [object constant] != nil)
abort ();
/* Put the original method back. */
if (method_setImplementation (method_a, original_imp_a) != original_imp_b)
abort ();
/* Check that behaviour is back to normal. */
if ([object variable] != object || [object constant] != nil)
abort ();
}
return (0);
}
|
