1 /* Test the Modern GNU Objective-C Runtime API.
3 This is test 'class-meta', covering calling functions starting with
4 'class' but using a meta class as argument.
6 Functions that manipulate methods (adding, replacing methods)
7 usually take a meta class argument to manipulate the class methods
8 instead of the instance ones. This is an important part of the API
11 Functions that manipulate instances, instance variables, properties
12 and protocols at the moment must take a normal class as argument;
13 calling them with a meta class as argument is of no particular use
14 and generally produces a behavior that is undocumented and/or
15 undefined (and this is true with all runtimes). As in the future
16 this behavior may be defined or documented (for example, if class
17 variables are implemented as instance variables of meta classes) we
18 avoid testing it for compatibility with future runtimes. */
21 /* { dg-skip-if "No API#2 pre-Darwin9" { *-*-darwin[5-8]* } { "-fnext-runtime" } { "" } } */
22 /* { dg-xfail-run-if "Needs OBJC2 ABI" { *-*-darwin* && { lp64 && { ! objc2 } } } { "-fnext-runtime" } { "" } } */
23 /* { dg-additional-options "-DOBJC_OLD_DISPATCH_PROTOTYPES" { target { *-*-darwin* } } } */
24 // { dg-additional-options "-Wno-objc-root-class" }
26 /* To get the modern GNU Objective-C Runtime API, you include
28 #include <objc/runtime.h>
33 @interface MyRootClass
40 @implementation MyRootClass
41 + alloc { return class_createInstance (self, 0); }
42 - init { return self; }
43 + initialize { return self; }
46 static id static_variable = nil;
48 @interface MySubClass : MyRootClass
49 + (void) setVariable: (id)value;
53 @implementation MySubClass
54 + (void) setVariable: (id)value { static_variable = value; }
55 + (id) variable { return static_variable; }
58 @interface DifferentClass : MyRootClass
62 @implementation DifferentClass
63 + (id) myClass { return self; }
66 @interface MySubClass (MySelf)
72 /* Functions are tested in alphabetical order. */
74 /* Calling class_addIvar() with a meta class is not documented and
75 (currently) of no use. */
76 /* std::cout << "Testing class_addIvar ()...\n"; */
78 std::cout << "Testing class_addMethod () on a meta class...\n";
80 /* Here we test adding methods to meta classes, ie, adding class methods. */
81 Class new_class = objc_allocateClassPair (objc_getClass ("MyRootClass"), "MySubClass2", 0);
82 Method method1 = class_getInstanceMethod (objc_getMetaClass ("MySubClass"), @selector (setVariable:));
83 Method method2 = class_getInstanceMethod (objc_getMetaClass ("MySubClass"), @selector (variable));
88 if (! class_addMethod (object_getClass (new_class), @selector (setVariable:), method_getImplementation (method1),
89 method_getTypeEncoding (method1)))
92 if (! class_addMethod (object_getClass (new_class), @selector (variable), method_getImplementation (method2),
93 method_getTypeEncoding (method2)))
96 /* Test that if the method already exists in the class,
97 class_addMethod() returns NO. */
98 if (class_addMethod (object_getClass (new_class), @selector (variable), method_getImplementation (method2),
99 method_getTypeEncoding (method2)))
102 objc_registerClassPair (new_class);
104 /* Now, MySubClass2 is basically the same as MySubClass! We'll
105 use the +variable and +setVariable: methods on it. */
107 Class c = objc_getClass ("MySubClass2");
108 id o = [[MyRootClass alloc] init];
112 if ([c variable] != o)
116 /* Now, try that if you take an existing class and try to add an
117 already existing method, class_addMethod returns NO. This is
118 subtly different from before, when 'new_class' was still in
119 construction. Now it's a real class and the libobjc internals
120 differ between the two cases. */
121 if (class_addMethod (object_getClass (new_class), @selector (variable), method_getImplementation (method2),
122 method_getTypeEncoding (method2)))
126 /* Calling class_addProtocol() on a meta class is not documented and
127 (currently) of no use. */
128 /* std::cout << "Testing class_addProtocol () on a meta class...\n"; */
130 /* Calling class_conformsToProtocol() on a meta class is not
131 documented and (currently) of no use. */
132 /* std::cout << "Testing class_conformsToProtocol () on a meta class...\n"; */
134 /* Calling class_copyIvarList() on a meta class is not documented
135 and (currently) of no use. */
136 /* std::cout << "Testing class_copyIvarList () on a meta class...\n"; */
138 std::cout << "Testing class_copyMethodList () on a meta class...\n";
140 /* Test that you can copy the method list of a meta class. They
141 are the class methods of the class. */
143 Method * list = class_copyMethodList (objc_getMetaClass ("MySubClass"), &count);
148 if (! ((std::strcmp (sel_getName (method_getName (list[0])), "variable") == 0
149 && std::strcmp (sel_getName (method_getName (list[1])), "setVariable:") == 0)
150 || (std::strcmp (sel_getName (method_getName (list[0])), "setVariable:") == 0
151 && std::strcmp (sel_getName (method_getName (list[1])), "variable") == 0)))
158 /* Calling class_copyPropertyList() on a meta class is not
159 documented and (currently) of no use. */
160 /* std::cout << "Testing class_copyPropertyList () on a meta class...\n"; */
162 /* Calling class_copyProtocolList() on a meta class is not
163 documented and (currently) of no use. */
164 /* std::cout << "Testing class_copyProtocolList () on a meta class...\n"; */
166 /* Calling class_createInstance() on a meta class is not documented
167 and (currently) of no use. */
168 /* std::cout << "Testing class_createInstance () on a meta class...\n"; */
170 /* Calling class_getClassMethod () on a meta class is not documented
171 and (currently) of no use. */
172 /* std::cout << "Testing class_getClassMethod () on a meta class...\n"; */
174 /* Calling class_getClassVariable () on a meta class is not
175 documented and (currently) of no use. */
176 /* std::cout << "Testing class_getClassVariable () on a meta class ...\n"; */
178 std::cout << "Testing class_getInstanceMethod () on a meta class...\n";
180 /* The instance method of a meta class is the class method with
181 the same name of the class. */
182 Method method_1 = class_getInstanceMethod (objc_getMetaClass ("MySubClass"),
183 @selector(variable));
184 Method method_2 = class_getClassMethod (objc_getClass ("MySubClass"),
185 @selector(variable));
187 if (method_1 == NULL || method_2 == NULL)
190 if (method_1 != method_2)
193 if (std::strcmp (sel_getName (method_getName (method_1)), "variable") != 0)
197 /* Calling class_getInstanceSize() with a meta class is not
198 documented and (currently) of no use. */
199 /* std::cout << "Testing class_getInstanceSize () on a meta class...\n"; */
201 /* Calling class_getInstanceVariable() with a meta class is not
202 documented and (currently) of no use. */
203 /* std::cout << "Testing class_getInstanceVariable () on a meta class...\n"; */
205 /* Calling class_getIvarLayout() with a meta class is not documented
206 and (currently) of no use. */
207 /* std::cout << "Testing class_getIvarLayout () on a meta class...\n"; */
209 std::cout << "Testing class_getMethodImplementation () on a meta class...\n";
211 /* Getting the method implementation with a meta class returns a
213 MySubClass *object = [[MySubClass alloc] init];
214 IMP imp = class_getMethodImplementation (objc_getMetaClass ("MySubClass"),
215 @selector(variable));
220 [MySubClass setVariable: object];
222 if ((*imp)(objc_getClass ("MySubClass"), @selector(variable)) != object)
226 /* This function does not exist with the GNU runtime. */
227 /* std::cout << "Testing class_getMethodImplementation_stret () on a meta class...\n"; */
229 std::cout << "Testing class_getName () on a meta class...\n";
231 /* Traditionally, a meta class has the same name as the class. */
232 if (std::strcmp (class_getName (objc_getMetaClass ("MyRootClass")),
237 /* Calling class_getProperty() with a meta class is not documented
238 and (currently) of no use. */
239 /* std::cout << "Testing class_getProperty ()...\n"; */
241 std::cout << "Testing class_getSuperclass () on a meta class...\n";
243 /* The superclass of a meta class is the meta class of the superclass. */
244 if (class_getSuperclass (objc_getMetaClass ("MySubClass")) != objc_getMetaClass ("MyRootClass"))
247 /* Test that it works on a newly created, but not registered, class. */
249 Class new_class = objc_allocateClassPair (objc_getClass ("MyRootClass"), "MySubClass3", 0);
251 if (class_getSuperclass (object_getClass (new_class)) != object_getClass (objc_getClass ("MyRootClass")))
256 /* Calling class_getVersion() with a meta class is not documented
257 and (currently) of no use. */
258 /* std::cout << "Testing class_getVersion ()...\n"; */
260 /* Calling class_getWeakIvarLayout() with a meta class is not
261 documented and (currently) of no use. */
262 /* std::cout << "Testing class_getWeakIvarLayout () on a meta class...\n"; */
264 /* class_isMetaClass() is already tested in gnu-api-2-class.m */
265 /* std::cout << "Testing class_isMetaClass ()...\n"; */
267 std::cout << "Testing class_replaceMethod () on a meta class...\n";
269 /* We are going to replace the [MySubclass +variable] method with
270 the [DifferentClass +myClass] one. */
271 Method new_method = class_getClassMethod (objc_getClass ("DifferentClass"),
272 @selector (myClass));
273 Method old_method = class_getClassMethod (objc_getClass ("MySubClass"),
274 @selector (variable));
275 const char *new_types = method_getTypeEncoding (new_method);
276 IMP new_imp = method_getImplementation (new_method);
277 const char *old_types = method_getTypeEncoding (old_method);
278 IMP old_imp = class_replaceMethod (objc_getMetaClass ("MySubClass"), @selector (variable),
279 method_getImplementation (new_method),
280 method_getTypeEncoding (new_method));
281 id o = [[MyRootClass alloc] init];
283 [MySubClass setVariable: o];
285 /* Try the new method implementation. */
286 if ([MySubClass variable] != objc_getClass ("MySubClass"))
289 /* Put the original method back. */
290 class_replaceMethod (objc_getMetaClass ("MySubClass"), @selector (variable),
293 /* Test it's back to what it was. */
294 if ([MySubClass variable] != o)
298 /* Finally, try adding a new method. */
299 class_replaceMethod (objc_getMetaClass ("DifferentClass"), @selector (mySelf),
302 if ([(Class)objc_getClass ("DifferentClass") mySelf] != objc_getClass ("DifferentClass"))
307 std::cout << "Testing class_respondsToSelector () on a meta class...\n";
309 /* A meta class responds to a selector if and only if the class
310 responds to the corresponding class method. */
311 if (! class_respondsToSelector (objc_getMetaClass ("MySubClass"), @selector(setVariable:)))
314 if (class_respondsToSelector (objc_getMetaClass ("MyRootClass"), @selector(setVariable:)))
318 /* This is not really implemented with the GNU runtime. */
319 /* std::cout << "Testing class_setIvarLayout () on a meta class...\n"; */
321 /* Calling class_setVersion() with a meta class is not documented
322 and (currently) of no use. */
323 /* std::cout << "Testing class_setVersion () on a meta class...\n"; */
325 /* This is not really implemented with the GNU runtime. */
326 /* std::cout << "Testing class_setWeakIvarLayout () on a meta class...\n"; */