1 | // RUN: %clang_analyze_cc1 -analyzer-checker=core,nullability -verify %s |
2 | |
3 | #define nil 0 |
4 | |
5 | @protocol NSObject |
6 | + (id)alloc; |
7 | - (id)init; |
8 | - (instancetype)autorelease; |
9 | - (void)release; |
10 | @end |
11 | |
12 | __attribute__((objc_root_class)) |
13 | @interface |
14 | NSObject<NSObject> |
15 | @end |
16 | |
17 | @interface TestObject : NSObject |
18 | @end |
19 | |
20 | TestObject *_Nonnull returnsNilObjCInstanceIndirectly() { |
21 | TestObject *local = nil; |
22 | return local; // expected-warning {{nil returned from a function that is expected to return a non-null value}} |
23 | } |
24 | |
25 | TestObject * _Nonnull returnsNilObjCInstanceIndirectlyWithSupressingCast() { |
26 | TestObject *local = nil; |
27 | return (TestObject * _Nonnull)local; // no-warning |
28 | } |
29 | |
30 | TestObject * _Nonnull returnsNilObjCInstanceDirectly() { |
31 | // The first warning is from Sema. The second is from the static analyzer. |
32 | return nil; // expected-warning {{null returned from function that requires a non-null return value}} |
33 | // expected-warning@-1 {{nil returned from a function that is expected to return a non-null value}} |
34 | } |
35 | |
36 | TestObject * _Nonnull returnsNilObjCInstanceDirectlyWithSuppressingCast() { |
37 | return (TestObject * _Nonnull)nil; // no-warning |
38 | } |
39 | |
40 | void testObjCNonARCNoInitialization(TestObject * _Nonnull p) { |
41 | TestObject * _Nonnull implicitlyZeroInitialized; // no-warning |
42 | implicitlyZeroInitialized = p; |
43 | } |
44 | |
45 | void testObjCNonARCExplicitZeroInitialization() { |
46 | TestObject * _Nonnull explicitlyZeroInitialized = nil; // expected-warning {{nil assigned to a pointer which is expected to have non-null value}} |
47 | } |
48 | |
49 | @interface ClassWithInitializers : NSObject |
50 | @end |
51 | |
52 | @implementation ClassWithInitializers |
53 | - (instancetype _Nonnull)initWithNonnullReturnAndSelfCheckingIdiom { |
54 | // This defensive check is a common-enough idiom that we don't want |
55 | // to issue a diagnostic for it. |
56 | if (self = [super init]) { |
57 | } |
58 | |
59 | return self; // no-warning |
60 | } |
61 | |
62 | - (instancetype _Nonnull)initWithNonnullReturnAndNilReturnViaLocal { |
63 | self = [super init]; |
64 | // This leaks, but we're not checking for that here. |
65 | |
66 | ClassWithInitializers *other = nil; |
67 | // False negative. Once we have more subtle suppression of defensive checks in |
68 | // initializers we should warn here. |
69 | return other; |
70 | } |
71 | |
72 | - (instancetype _Nonnull)initWithPreconditionViolation:(int)p { |
73 | self = [super init]; |
74 | if (p < 0) { |
75 | [self release]; |
76 | return (ClassWithInitializers * _Nonnull)nil; |
77 | } |
78 | return self; |
79 | } |
80 | |
81 | + (instancetype _Nonnull)factoryCallingInitWithNonnullReturnAndSelfCheckingIdiom { |
82 | return [[[self alloc] initWithNonnullReturnAndSelfCheckingIdiom] autorelease]; // no-warning |
83 | } |
84 | |
85 | + (instancetype _Nonnull)factoryCallingInitWithNonnullReturnAndNilReturnViaLocal { |
86 | return [[[self alloc] initWithNonnullReturnAndNilReturnViaLocal] autorelease]; // no-warning |
87 | } |
88 | |
89 | + (instancetype _Nonnull)initWithPreconditionViolation:(int) p { |
90 | return [[[self alloc] initWithPreconditionViolation:p] autorelease]; // no-warning |
91 | } |
92 | |
93 | - (TestObject * _Nonnull) returnsNil { |
94 | return (TestObject * _Nonnull)nil; |
95 | } |
96 | - (TestObject * _Nonnull) inlineOfReturnsNilObjCInstanceDirectlyWithSuppressingCast { |
97 | TestObject *o = [self returnsNil]; |
98 | return o; |
99 | } |
100 | @end |
101 | |