1 | // RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-config suppress-inlined-defensive-checks=true -verify %s |
2 | |
3 | typedef signed char BOOL; |
4 | typedef struct objc_class *Class; |
5 | typedef struct objc_object { |
6 | Class isa; |
7 | } *id; |
8 | @protocol NSObject - (BOOL)isEqual:(id)object; @end |
9 | @interface NSObject <NSObject> {} |
10 | +(id)alloc; |
11 | +(id)new; |
12 | -(id)init; |
13 | -(id)autorelease; |
14 | -(id)copy; |
15 | - (Class)class; |
16 | -(id)retain; |
17 | @end |
18 | |
19 | // Check that inline defensive checks is triggered for null expressions |
20 | // within CompoundLiteralExpr. |
21 | typedef union { |
22 | struct dispatch_object_s *_do; |
23 | struct dispatch_source_s *_ds; |
24 | } dispatch_object_t __attribute__((__transparent_union__)); |
25 | typedef struct dispatch_source_s *dispatch_source_t; |
26 | |
27 | extern __attribute__((visibility("default"))) __attribute__((__nonnull__)) __attribute__((__nothrow__)) |
28 | void |
29 | dispatch_resume(dispatch_object_t object); |
30 | |
31 | @interface AppDelegate : NSObject { |
32 | @protected |
33 | dispatch_source_t p; |
34 | } |
35 | @end |
36 | @implementation AppDelegate |
37 | - (void)updateDeleteTimer { |
38 | if (p != ((void*)0)) |
39 | ; |
40 | } |
41 | - (void)createAndStartDeleteTimer { |
42 | [self updateDeleteTimer]; |
43 | dispatch_resume(p); // no warning |
44 | } |
45 | @end |
46 | |
47 | // Test nil receiver suppression. |
48 | // We only suppress on nil receiver if the nil value is directly causing the bug. |
49 | @interface Foo { |
50 | @public |
51 | int x; |
52 | } |
53 | - (Foo *)getFooPtr; |
54 | @end |
55 | |
56 | Foo *retNil() { |
57 | return 0; |
58 | } |
59 | |
60 | Foo *retInputOrNil(Foo *p) { |
61 | if (p) |
62 | return p; |
63 | return 0; |
64 | } |
65 | |
66 | void idc(Foo *p) { |
67 | if (p) |
68 | ; |
69 | } |
70 | |
71 | int testNilReceiver(Foo* fPtr) { |
72 | if (fPtr) |
73 | ; |
74 | // On a path where fPtr is nil, mem should be nil. |
75 | Foo *mem = [fPtr getFooPtr]; |
76 | return mem->x; // expected-warning {{Access to instance variable 'x' results in a dereference of a null pointer}} |
77 | } |
78 | |
79 | int suppressNilReceiverRetNullCond(Foo* fPtr) { |
80 | unsigned zero = 0; |
81 | fPtr = retInputOrNil(fPtr); |
82 | // On a path where fPtr is nzil, mem should be nil. |
83 | Foo *mem = [fPtr getFooPtr]; |
84 | return mem->x; |
85 | } |
86 | |
87 | int suppressNilReceiverRetNullCondCast(id fPtr) { |
88 | unsigned zero = 0; |
89 | fPtr = retInputOrNil(fPtr); |
90 | // On a path where fPtr is nzil, mem should be nil. |
91 | Foo *mem = ((id)([(Foo*)(fPtr) getFooPtr])); |
92 | return mem->x; |
93 | } |
94 | |
95 | int dontSuppressNilReceiverRetNullCond(Foo* fPtr) { |
96 | unsigned zero = 0; |
97 | fPtr = retInputOrNil(fPtr); |
98 | // On a path where fPtr is nil, mem should be nil. |
99 | // The warning is not suppressed because the receiver being nil is not |
100 | // directly related to the value that triggers the warning. |
101 | Foo *mem = [fPtr getFooPtr]; |
102 | if (!mem) |
103 | return 5/zero; // expected-warning {{Division by zero}} |
104 | return 0; |
105 | } |
106 | |
107 | int dontSuppressNilReceiverRetNull(Foo* fPtr) { |
108 | unsigned zero = 0; |
109 | fPtr = retNil(); |
110 | // On a path where fPtr is nil, mem should be nil. |
111 | // The warning is not suppressed because the receiver being nil is not |
112 | // directly related to the value that triggers the warning. |
113 | Foo *mem = [fPtr getFooPtr]; |
114 | if (!mem) |
115 | return 5/zero; // expected-warning {{Division by zero}} |
116 | return 0; |
117 | } |
118 | |
119 | int dontSuppressNilReceiverIDC(Foo* fPtr) { |
120 | unsigned zero = 0; |
121 | idc(fPtr); |
122 | // On a path where fPtr is nil, mem should be nil. |
123 | // The warning is not suppressed because the receiver being nil is not |
124 | // directly related to the value that triggers the warning. |
125 | Foo *mem = [fPtr getFooPtr]; |
126 | if (!mem) |
127 | return 5/zero; // expected-warning {{Division by zero}} |
128 | return 0; |
129 | } |
130 | |