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() {
25
26  id x;
27
28  // rdar://8290002
29  [(*x).isa self]; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
30  [x->isa self]; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
31
32  Whatever *y;
33
34  // GCC allows this, with the following warning:
35  //   instance variable 'isa' is @protected; this will be a hard error in the future
36  //
37  // FIXME: see if we can avoid the warning that follows the error.
38  [(*y).isa self]; // expected-error {{instance variable 'isa' is protected}} \
39                      expected-warning{{receiver type 'struct objc_class *' is not 'id' or interface pointer, consider casting it to 'id'}}
40  [y->isa self]; // expected-error {{instance variable 'isa' is protected}} \
41                    expected-warning{{receiver type 'struct objc_class *' is not 'id' or interface pointer, consider casting it to 'id'}}
42}
43
44// rdar://11702488
45// If an ivar is (1) the first ivar in a root class and (2) named `isa`,
46// then it should get the same warnings that id->isa gets.
47
48@interface BaseClass {
49@public
50    Class isa; // expected-note 4 {{instance variable is declared here}}
51}
52@end
53
54@interface OtherClass {
55@public
56    id    firstIvar;
57    Class isa; // note, not first ivar;
58}
59@end
60
61@interface Subclass : BaseClass @end
62
63@interface SiblingClass : BaseClass @end
64
65@interface Root @end
66
67@interface hasIsa : Root {
68@public
69  Class isa; // note, isa is not in root class
70}
71@end
72
73@implementation Subclass
74-(void)method {
75    hasIsa *u;
76    id v;
77    BaseClass *w;
78    Subclass *x;
79    SiblingClass *y;
80    OtherClass *z;
81    (void)v->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
82    (void)w->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
83    (void)x->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
84    (void)y->isa; // expected-warning {{direct access to Objective-C's isa is deprecated in favor of object_getClass()}}
85    (void)z->isa;
86    (void)u->isa;
87
88    w->isa = 0; // expected-warning {{assignment to Objective-C's isa is deprecated in favor of object_setClass()}}
89}
90@end
91
92// Test for introspection of Objective-C pointers via bitmasking.
93
94void testBitmasking(NSObject *p) {
95  (void) (((NSUInteger) p) & 0x1); // expected-warning {{bitmasking for introspection of Objective-C object pointers is strongly discouraged}}
96  (void) (0x1 & ((NSUInteger) p)); // expected-warning {{bitmasking for introspection of Objective-C object pointers is strongly discouraged}}
97  (void) (((NSUInteger) p) ^ 0x1); // no-warning
98  (void) (0x1 ^ ((NSUInteger) p)); // no-warning
99  (void) (0x1 & ((NSUInteger) [p performSelector:@selector(foo)])); // expected-warning {{bitmasking for introspection of Objective-C object pointers is strongly discouraged}}
100#pragma clang diagnostic push
101#pragma clang diagnostic ignored "-Wdeprecated-objc-pointer-introspection-performSelector"
102  (void) (0x1 & ((NSUInteger) [p performSelector:@selector(foo)])); // no-warning
103#pragma clang diagnostic pop
104}