comptypes-1.m
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// RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
#define nil (void *)0;
extern void foo();
@protocol MyProtocol
- (void) foo;
+ (void) bar;
@end
@interface MyClass
@end
@interface MyOtherClass <MyProtocol>
- (void) foo;
@end
int main()
{
id obj = nil;
id<MyProtocol> obj_p = nil;
MyClass *obj_c = nil;
MyOtherClass *obj_cp = nil;
Class obj_C = nil;
Class<MyProtocol> obj_CP = nil;
/* Assigning to an 'id' variable should never
generate a warning. */
obj = obj_p; /* Ok */
obj = obj_c; /* Ok */
obj = obj_cp; /* Ok */
obj = obj_C; /* Ok */
obj = obj_CP; /* Ok */
/* Assigning to a 'MyClass *' variable should always generate a
warning, unless done from an 'id'. */
obj_c = obj; /* Ok */
obj_c = obj_p; // expected-warning {{assigning to 'MyClass *' from incompatible type 'id<MyProtocol>'}}
obj_c = obj_cp; // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'MyOtherClass *'}}
obj_c = obj_C; // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'Class'}}
obj_c = obj_CP; // expected-warning {{incompatible pointer types assigning to 'MyClass *' from 'Class<MyProtocol>'}}
/* Assigning to an 'id<MyProtocol>' variable should generate a
warning if done from a 'MyClass *' (which doesn't implement
MyProtocol), but not from an 'id' or from a 'MyOtherClass *'
(which implements MyProtocol). */
obj_p = obj; /* Ok */
obj_p = obj_c; // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'MyClass *'}}
obj_p = obj_cp; /* Ok */
obj_p = obj_C; // expected-warning {{incompatible pointer types assigning to 'id<MyProtocol>' from 'Class'}}
obj_p = obj_CP; // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'Class<MyProtocol>'}}
/* Assigning to a 'MyOtherClass *' variable should always generate
a warning, unless done from an 'id' or an 'id<MyProtocol>' (since
MyOtherClass implements MyProtocol). */
obj_cp = obj; /* Ok */
obj_cp = obj_c; // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'MyClass *'}}
obj_cp = obj_p; /* Ok */
obj_cp = obj_C; // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'Class'}}
obj_cp = obj_CP; // expected-warning {{incompatible pointer types assigning to 'MyOtherClass *' from 'Class<MyProtocol>'}}
obj_C = obj; // Ok
obj_C = obj_p; // expected-warning {{incompatible pointer types assigning to 'Class' from 'id<MyProtocol>'}}
obj_C = obj_c; // expected-warning {{incompatible pointer types assigning to 'Class' from 'MyClass *'}}
obj_C = obj_cp; // expected-warning {{incompatible pointer types assigning to 'Class' from 'MyOtherClass *'}}
obj_C = obj_CP; // Ok
obj_CP = obj; // Ok
obj_CP = obj_p; // expected-warning {{assigning to 'Class<MyProtocol>' from incompatible type 'id<MyProtocol>'}}
obj_CP = obj_c; // expected-warning {{incompatible pointer types assigning to 'Class<MyProtocol>' from 'MyClass *}}
obj_CP = obj_cp; // expected-warning {{incompatible pointer types assigning to 'Class<MyProtocol>' from 'MyOtherClass *'}}
obj_CP = obj_C; // Ok
/* Any comparison involving an 'id' must be without warnings. */
if (obj == obj_p) foo(); /* Ok */ /*Bogus warning here in 2.95.4*/
if (obj_p == obj) foo(); /* Ok */
if (obj == obj_c) foo(); /* Ok */
if (obj_c == obj) foo(); /* Ok */
if (obj == obj_cp) foo(); /* Ok */
if (obj_cp == obj) foo(); /* Ok */
if (obj == obj_C) foo(); /* Ok */
if (obj_C == obj) foo(); /* Ok */
if (obj == obj_CP) foo(); /* Ok */
if (obj_CP == obj) foo(); /* Ok */
/* Any comparison between 'MyClass *' and anything which is not an 'id'
must generate a warning. */
if (obj_c == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'id<MyProtocol>')}}
if (obj_p == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'MyClass *')}}
if (obj_c == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'MyOtherClass *')}}
if (obj_cp == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'MyClass *')}}
if (obj_c == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class')}}
if (obj_C == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'MyClass *')}}
if (obj_c == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class<MyProtocol>')}}
if (obj_CP == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyClass *')}}
/* Any comparison between 'MyOtherClass *' (which implements
MyProtocol) and an 'id' implementing MyProtocol are Ok. */
if (obj_p == obj_cp) foo(); /* Ok */
if (obj_cp == obj_p) foo(); /* Ok */
if (obj_p == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class')}}
if (obj_C == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'id<MyProtocol>')}}
if (obj_p == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class<MyProtocol>')}}
if (obj_CP == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'id<MyProtocol>')}}
/* Comparisons between MyOtherClass * and Class types is a warning */
if (obj_cp == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class')}}
if (obj_C == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'MyOtherClass *')}}
if (obj_cp == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class<MyProtocol>')}}
if (obj_CP == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyOtherClass *')}}
/* Comparisons between a Class and a Class<MyProtocol> are ok */
if (obj_C == obj_CP) foo(); /* Ok */
if (obj_CP == obj_C) foo(); /* Ok */
return 0;
}