unused-ivars.m revision ef74f4c6dcd59b3af1de9d8f613c1caf3e6cb63d 
1// RUN: clang -cc1 -fblocks -analyze -warn-objc-unused-ivars %s -verify
2
3//===--- BEGIN: Delta-debugging reduced headers. --------------------------===//
4
5@protocol NSObject
6- (id)retain;
7- (oneway void)release;
8@end
9@interface NSObject <NSObject> {}
10- (id)init;
11+ (id)alloc;
12@end
13
14//===--- END: Delta-debugging reduced headers. ----------------------------===//
15
16// This test case tests the basic functionality of the unused ivar test.
17@interface TestA {
18@private
19  int x; // expected-warning {{Instance variable 'x' in class 'TestA' is never used}}
20}
21@end
22@implementation TestA @end
23
24// This test case tests whether the unused ivar check handles blocks that
25// reference an instance variable. (<rdar://problem/7075531>)
26@interface TestB : NSObject {
27@private
28  id _ivar; // no-warning
29}
30@property (readwrite,retain) id ivar;
31@end
32
33@implementation TestB
34- (id)ivar {
35  __attribute__((__blocks__(byref))) id value = ((void*)0);
36  void (^b)() = ^{ value = _ivar; };
37  b();
38  return value;
39}
40
41- (void)setIvar:(id)newValue {
42  void (^b)() = ^{ [_ivar release]; _ivar = [newValue retain]; };
43  b();
44}
45@end
46
47//===----------------------------------------------------------------------===//
48// <rdar://problem/6260004> Detect that ivar is in use, if used in category 
49//  in the same file as the implementation
50//===----------------------------------------------------------------------===//
51
52@protocol Protocol6260004
53- (id) getId;
54@end
55
56@interface RDar6260004 {
57@private
58  id x; // no-warning
59}
60@end
61@implementation RDar6260004 @end
62@implementation RDar6260004 (Protocol6260004)
63- (id) getId {
64  return x;
65}
66@end
67
68//===----------------------------------------------------------------------===//
69// <rdar://problem/7254495> - ivars referenced by lexically nested functions
70//  should not be flagged as unused
71//===----------------------------------------------------------------------===//
72
73@interface RDar7254495 {
74@private
75  int x; // no-warning
76}
77@end
78
79@implementation RDar7254495
80int radar_7254495(RDar7254495 *a) {
81  return a->x;
82}
83@end
84