xref: /llvm-project/clang/test/SemaObjC/deprecated-objc-introspection.m (revision 0f1c1be1968076d6f96f8a7bcc4a15cf195ecd97) 
1// RUN: %clang_cc1 -triple=x86_64-apple-darwin -fsyntax-only -verify %s
2
3//====------------------------------------------------------------====//
4// Test deprecated direct usage of the 'isa' pointer.
5//====------------------------------------------------------------====//
6
7typedef unsigned long NSUInteger;
8
9typedef struct objc_object {
10  struct objc_class *isa;
11} *id;
12
13@interface NSObject {
14  id firstobj;
15  struct objc_class *isa;
16}
17- (id)performSelector:(SEL)aSelector;;
18@end
19@interface Whatever : NSObject
20+self;
21-(id)foo;
22@end
23
24static void func(void) {
25
26  id x;
27
28  [(*x).isa self]; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
29  [x->isa self]; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
30
31  Whatever *y;
32
33  // GCC allows this, with the following warning:
34  //   instance variable 'isa' is @protected; this will be a hard error in the future
35  //
36  // FIXME: see if we can avoid the warning that follows the error.
37  [(*y).isa self]; // expected-error {{instance variable 'isa' is protected}} \
38                      expected-warning{{receiver type 'struct objc_class *' is not 'id' or interface pointer, consider casting it to 'id'}}
39  [y->isa self]; // expected-error {{instance variable 'isa' is protected}} \
40                    expected-warning{{receiver type 'struct objc_class *' is not 'id' or interface pointer, consider casting it to 'id'}}
41}
42
43// If an ivar is (1) the first ivar in a root class and (2) named `isa`,
44// then it should get the same warnings that id->isa gets.
45
46@interface BaseClass {
47@public
48    Class isa; // expected-note 4 {{instance variable is declared here}}
49}
50@end
51
52@interface OtherClass {
53@public
54    id    firstIvar;
55    Class isa; // note, not first ivar;
56}
57@end
58
59@interface Subclass : BaseClass @end
60
61@interface SiblingClass : BaseClass @end
62
63@interface Root @end
64
65@interface hasIsa : Root {
66@public
67  Class isa; // note, isa is not in root class
68}
69@end
70
71@implementation Subclass
72-(void)method {
73    hasIsa *u;
74    id v;
75    BaseClass *w;
76    Subclass *x;
77    SiblingClass *y;
78    OtherClass *z;
79    (void)v->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
80    (void)w->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
81    (void)x->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
82    (void)y->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
83    (void)z->isa;
84    (void)u->isa;
85
86    w->isa = 0; // expected-warning {{assignment to Objective-C's isa is deprecated in favor of object_setClass()}}
87}
88@end
89
90// Test for introspection of Objective-C pointers via bitmasking.
91
92void testBitmasking(NSObject *p) {
93  (void) (((NSUInteger) p) & 0x1); // expected-warning {{bitmasking for introspection of Objective-C object pointers is strongly discouraged}}
94  (void) (0x1 & ((NSUInteger) p)); // expected-warning {{bitmasking for introspection of Objective-C object pointers is strongly discouraged}}
95  (void) (((NSUInteger) p) ^ 0x1); // no-warning
96  (void) (0x1 ^ ((NSUInteger) p)); // no-warning
97  (void) (0x1 & ((NSUInteger) [p performSelector:@selector(foo)])); // expected-warning {{bitmasking for introspection of Objective-C object pointers is strongly discouraged}}
98#pragma clang diagnostic push
99#pragma clang diagnostic ignored "-Wdeprecated-objc-pointer-introspection-performSelector"
100  (void) (0x1 & ((NSUInteger) [p performSelector:@selector(foo)])); // no-warning
101#pragma clang diagnostic pop
102}