| 1 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
| 2 | |
| 3 | #if !__has_feature(objc_instancetype) |
| 4 | # error Missing 'instancetype' feature macro. |
| 5 | #endif |
| 6 | |
| 7 | @interface Root |
| 8 | + (instancetype)alloc; // expected-note {{explicitly declared 'instancetype'}} |
| 9 | - (instancetype)init; // expected-note{{overridden method is part of the 'init' method family}} |
| 10 | - (instancetype)self; // expected-note {{explicitly declared 'instancetype'}} |
| 11 | - (Class)class; |
| 12 | |
| 13 | @property (assign) Root *selfProp; |
| 14 | - (instancetype)selfProp; |
| 15 | @end |
| 16 | |
| 17 | @protocol Proto1 |
| 18 | @optional |
| 19 | - (instancetype)methodInProto1; |
| 20 | @end |
| 21 | |
| 22 | @protocol Proto2 |
| 23 | @optional |
| 24 | - (instancetype)methodInProto2; // expected-note{{overridden method returns an instance of its class type}} |
| 25 | - (instancetype)otherMethodInProto2; // expected-note{{overridden method returns an instance of its class type}} |
| 26 | @end |
| 27 | |
| 28 | @interface Subclass1 : Root // expected-note 4 {{receiver is instance of class declared here}} |
| 29 | - (instancetype)initSubclass1; |
| 30 | - (void)methodOnSubclass1; |
| 31 | + (instancetype)allocSubclass1; |
| 32 | @end |
| 33 | |
| 34 | @interface Subclass2 : Root |
| 35 | - (instancetype)initSubclass2; |
| 36 | - (void)methodOnSubclass2; |
| 37 | @end |
| 38 | |
| 39 | // Sanity check: the basic initialization pattern. |
| 40 | void test_instancetype_alloc_init_simple() { |
| 41 | Root *r1 = [[Root alloc] init]; |
| 42 | Subclass1 *sc1 = [[Subclass1 alloc] init]; |
| 43 | } |
| 44 | |
| 45 | // Test that message sends to instancetype methods have the right type. |
| 46 | void test_instancetype_narrow_method_search() { |
| 47 | // instancetype on class methods |
| 48 | Subclass1 *sc1 = [[Subclass1 alloc] initSubclass2]; // expected-warning{{'Subclass1' may not respond to 'initSubclass2'}} |
| 49 | Subclass2 *sc2 = [[Subclass2 alloc] initSubclass2]; // okay |
| 50 | |
| 51 | // instancetype on instance methods |
| 52 | [[[Subclass1 alloc] init] methodOnSubclass2]; // expected-warning{{'Subclass1' may not respond to 'methodOnSubclass2'}} |
| 53 | [[[Subclass2 alloc] init] methodOnSubclass2]; |
| 54 | |
| 55 | // instancetype on class methods using protocols |
| 56 | typedef Subclass1<Proto1> SC1Proto1; |
| 57 | typedef Subclass1<Proto2> SC1Proto2; |
| 58 | [[SC1Proto1 alloc] methodInProto2]; // expected-warning{{method '-methodInProto2' not found (return type defaults to 'id')}} |
| 59 | [[SC1Proto2 alloc] methodInProto2]; |
| 60 | |
| 61 | // instancetype on instance methods |
| 62 | Subclass1<Proto1> *sc1proto1 = 0; |
| 63 | [[sc1proto1 self] methodInProto2]; // expected-warning{{method '-methodInProto2' not found (return type defaults to 'id')}} |
| 64 | Subclass1<Proto2> *sc1proto2 = 0; |
| 65 | [[sc1proto2 self] methodInProto2]; |
| 66 | |
| 67 | // Exact type checks |
| 68 | typeof([[Subclass1 alloc] init]) *ptr1 = (Subclass1 **)0; |
| 69 | typeof([[Subclass2 alloc] init]) *ptr2 = (Subclass2 **)0; |
| 70 | |
| 71 | // Message sends to Class. |
| 72 | Subclass1<Proto1> *sc1proto1_2 = [[[sc1proto1 class] alloc] init]; |
| 73 | |
| 74 | // Property access |
| 75 | [sc1proto1.self methodInProto2]; // expected-warning{{method '-methodInProto2' not found (return type defaults to 'id')}} |
| 76 | [sc1proto2.self methodInProto2]; |
| 77 | [Subclass1.alloc initSubclass2]; // expected-warning{{'Subclass1' may not respond to 'initSubclass2'}} |
| 78 | [Subclass2.alloc initSubclass2]; |
| 79 | |
| 80 | [sc1proto1.selfProp methodInProto2]; // expected-warning{{method '-methodInProto2' not found (return type defaults to 'id')}} |
| 81 | [sc1proto2.selfProp methodInProto2]; |
| 82 | } |
| 83 | |
| 84 | // Test that message sends to super methods have the right type. |
| 85 | @interface Subsubclass1 : Subclass1 |
| 86 | - (instancetype)initSubclass1; |
| 87 | + (instancetype)allocSubclass1; |
| 88 | |
| 89 | - (void)onlyInSubsubclass1; |
| 90 | @end |
| 91 | |
| 92 | @implementation Subsubclass1 |
| 93 | - (instancetype)initSubclass1 { |
| 94 | // Check based on method search. |
| 95 | [[super initSubclass1] methodOnSubclass2]; // expected-warning{{'Subsubclass1' may not respond to 'methodOnSubclass2'}} |
| 96 | [super.initSubclass1 methodOnSubclass2]; // expected-warning{{'Subsubclass1' may not respond to 'methodOnSubclass2'}} |
| 97 | |
| 98 | self = [super init]; // common pattern |
| 99 | |
| 100 | // Exact type check. |
| 101 | typeof([super initSubclass1]) *ptr1 = (Subsubclass1**)0; |
| 102 | |
| 103 | return self; |
| 104 | } |
| 105 | |
| 106 | + (instancetype)allocSubclass1 { |
| 107 | // Check based on method search. |
| 108 | [[super allocSubclass1] methodOnSubclass2]; // expected-warning{{'Subsubclass1' may not respond to 'methodOnSubclass2'}} |
| 109 | |
| 110 | // The ASTs don't model super property accesses well enough to get this right |
| 111 | [super.allocSubclass1 methodOnSubclass2]; // expected-warning{{'Subsubclass1' may not respond to 'methodOnSubclass2'}} |
| 112 | |
| 113 | // Exact type check. |
| 114 | typeof([super allocSubclass1]) *ptr1 = (Subsubclass1**)0; |
| 115 | |
| 116 | return [super allocSubclass1]; |
| 117 | } |
| 118 | |
| 119 | - (void)onlyInSubsubclass1 {} |
| 120 | @end |
| 121 | |
| 122 | // Check compatibility rules for inheritance of related return types. |
| 123 | @class Subclass4; |
| 124 | |
| 125 | @interface Subclass3 <Proto1, Proto2> |
| 126 | - (Subclass3 *)methodInProto1; |
| 127 | - (Subclass4 *)methodInProto2; // expected-warning{{method is expected to return an instance of its class type 'Subclass3', but is declared to return 'Subclass4 *'}} |
| 128 | @end |
| 129 | |
| 130 | @interface Subclass4 : Root |
| 131 | + (Subclass4 *)alloc; // okay |
| 132 | - (Subclass3 *)init; // expected-warning{{method is expected to return an instance of its class type 'Subclass4', but is declared to return 'Subclass3 *'}} |
| 133 | - (id)self; // expected-note{{overridden method is part of the 'self' method family}} |
| 134 | - (instancetype)initOther; |
| 135 | @end |
| 136 | |
| 137 | @protocol Proto3 <Proto1, Proto2> |
| 138 | @optional |
| 139 | - (id)methodInProto1; |
| 140 | - (Subclass1 *)methodInProto2; |
| 141 | - (int)otherMethodInProto2; // expected-warning{{protocol method is expected to return an instance of the implementing class, but is declared to return 'int'}} |
| 142 | @end |
| 143 | |
| 144 | @implementation Subclass4 |
| 145 | + (id)alloc { |
| 146 | return self; // expected-warning{{incompatible pointer types returning 'Class' from a function with result type 'Subclass4 *'}} |
| 147 | } |
| 148 | |
| 149 | - (Subclass3 *)init { return 0; } // don't complain: we lost the related return type |
| 150 | |
| 151 | - (Subclass3 *)self { return 0; } // expected-warning{{method is expected to return an instance of its class type 'Subclass4', but is declared to return 'Subclass3 *'}} |
| 152 | |
| 153 | - (Subclass4 *)initOther { return 0; } |
| 154 | |
| 155 | @end |
| 156 | |
| 157 | // Check that inherited related return types influence the types of |
| 158 | // message sends. |
| 159 | void test_instancetype_inherited() { |
| 160 | [[Subclass4 alloc] initSubclass1]; // expected-warning{{'Subclass4' may not respond to 'initSubclass1'}} |
| 161 | [[Subclass4 alloc] initOther]; |
| 162 | } |
| 163 | |
| 164 | // Check that related return types tighten up the semantics of |
| 165 | // Objective-C method implementations. |
| 166 | @implementation Subclass2 |
| 167 | - (instancetype)initSubclass2 { // expected-note {{explicitly declared 'instancetype'}} |
| 168 | Subclass1 *sc1 = [[Subclass1 alloc] init]; |
| 169 | return sc1; // expected-warning{{incompatible pointer types returning 'Subclass1 *' from a function with result type 'Subclass2 *'}} |
| 170 | } |
| 171 | - (void)methodOnSubclass2 {} |
| 172 | - (id)self { |
| 173 | Subclass1 *sc1 = [[Subclass1 alloc] init]; |
| 174 | return sc1; // expected-warning{{incompatible pointer types returning 'Subclass1 *' from a function with result type 'Subclass2 *'}} |
| 175 | } |
| 176 | @end |
| 177 | |
| 178 | @interface MyClass : Root |
| 179 | + (int)myClassMethod; |
| 180 | @end |
| 181 | |
| 182 | @implementation MyClass |
| 183 | + (int)myClassMethod { return 0; } |
| 184 | |
| 185 | - (void)blah { |
| 186 | int i = [[MyClass self] myClassMethod]; |
| 187 | } |
| 188 | |
| 189 | @end |
| 190 | |
| 191 | // rdar://12493140 |
| 192 | @protocol P4 |
| 193 | - (instancetype) foo; // expected-note {{current method is explicitly declared 'instancetype' and is expected to return an instance of its class type}} |
| 194 | @end |
| 195 | @interface A4 : Root <P4> |
| 196 | - (instancetype) bar; // expected-note {{current method is explicitly declared 'instancetype' and is expected to return an instance of its class type}} |
| 197 | - (instancetype) baz; // expected-note {{overridden method returns an instance of its class type}} expected-note {{previous definition is here}} |
| 198 | @end |
| 199 | @interface B4 : Root @end |
| 200 | |
| 201 | @implementation A4 { |
| 202 | B4 *_b; |
| 203 | } |
| 204 | - (id) foo { |
| 205 | return _b; // expected-warning {{incompatible pointer types returning 'B4 *' from a function with result type 'A4 *'}} |
| 206 | } |
| 207 | - (id) bar { |
| 208 | return _b; // expected-warning {{incompatible pointer types returning 'B4 *' from a function with result type 'A4 *'}} |
| 209 | } |
| 210 | |
| 211 | // This is really just to ensure that we don't crash. |
| 212 | // FIXME: only one diagnostic, please |
| 213 | - (float) baz { // expected-warning {{method is expected to return an instance of its class type 'A4', but is declared to return 'float'}} expected-warning {{conflicting return type in implementation}} |
| 214 | return 0; |
| 215 | } |
| 216 | @end |
| 217 | |