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jeremybenn |
/* Test various ObjC types assignments and comparisons. */
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/* Author: Nicola Pero <nicola@brainstorm.co.uk>. */
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/* { dg-do compile } */
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#include <objc/objc.h>
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@protocol MyProtocol
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- (void) foo;
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@end
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@interface MyClass
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@end
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@interface MyOtherClass <MyProtocol>
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- (void) foo;
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@end
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int main()
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{
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id obj = nil;
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id<MyProtocol> obj_p = nil;
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MyClass *obj_c = nil;
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MyOtherClass *obj_cp = nil;
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Class obj_C = Nil;
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/* Assigning to an 'id' variable should never
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generate a warning. */
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obj = obj_p; /* Ok */
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obj = obj_c; /* Ok */
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obj = obj_cp; /* Ok */
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obj = obj_C; /* Ok */
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/* Assigning to a 'MyClass *' variable should always generate a
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warning, unless done from an 'id'. */
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obj_c = obj; /* Ok */
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obj_c = obj_p; /* { dg-warning "distinct Objective\\-C type" } */
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obj_c = obj_cp; /* { dg-warning "distinct Objective\\-C type" } */
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obj_c = obj_C; /* { dg-warning "distinct Objective\\-C type" } */
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/* Assigning to an 'id<MyProtocol>' variable should generate a
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warning if done from a 'MyClass *' (which doesn't implement
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MyProtocol), but not from an 'id' or from a 'MyOtherClass *'
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(which implements MyProtocol). */
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obj_p = obj; /* Ok */
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obj_p = obj_c; /* { dg-warning "does not implement" } */
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obj_p = obj_cp; /* Ok */
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obj_p = obj_C; /* { dg-warning "distinct Objective\\-C type" } */
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/* Assigning to a 'MyOtherClass *' variable should always generate
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a warning, unless done from an 'id' or an 'id<MyProtocol>' (since
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MyOtherClass implements MyProtocol). */
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obj_cp = obj; /* Ok */
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obj_cp = obj_c; /* { dg-warning "distinct Objective\\-C type" } */
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obj_cp = obj_p; /* Ok */
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obj_cp = obj_C; /* { dg-warning "distinct Objective\\-C type" } */
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/* Any comparison involving an 'id' must be without warnings. */
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if (obj == obj_p) ; /* Ok */ /*Bogus warning here in 2.95.4*/
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if (obj_p == obj) ; /* Ok */
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if (obj == obj_c) ; /* Ok */
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if (obj_c == obj) ; /* Ok */
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if (obj == obj_cp) ; /* Ok */
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if (obj_cp == obj) ; /* Ok */
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if (obj == obj_C) ; /* Ok */
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if (obj_C == obj) ; /* Ok */
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/* Any comparison between 'MyClass *' and anything which is not an 'id'
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must generate a warning. */
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if (obj_c == obj_p) ; /* { dg-warning "lacks a cast" } */
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if (obj_p == obj_c) ; /* { dg-warning "lacks a cast" } */
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if (obj_c == obj_cp) ; /* { dg-warning "lacks a cast" } */
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if (obj_cp == obj_c) ; /* { dg-warning "lacks a cast" } */
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if (obj_c == obj_C) ; /* { dg-warning "lacks a cast" } */
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if (obj_C == obj_c) ; /* { dg-warning "lacks a cast" } */
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/* Any comparison between 'MyOtherClass *' (which implements
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MyProtocol) and an 'id' implementing MyProtocol are Ok. */
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if (obj_cp == obj_p) ; /* Ok */
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if (obj_p == obj_cp) ; /* Ok */
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if (obj_p == obj_C) ; /* { dg-warning "lacks a cast" } */
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if (obj_C == obj_p) ; /* { dg-warning "lacks a cast" } */
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if (obj_cp == obj_C) ; /* { dg-warning "lacks a cast" } */
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if (obj_C == obj_cp) ; /* { dg-warning "lacks a cast" } */
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return 0;
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}
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