gcc/testsuite/objc.dg/comp-types-1.m

   1 /* Test various ObjC types assignments and comparisons.  */
   2 /* Author: Nicola Pero <nicola@brainstorm.co.uk>.  */
   3 /* { dg-do compile } */
   4 #include <objc/objc.h>
   5
   6 @protocol MyProtocol
   7 - (void) foo;
   8 @end
   9
  10 @interface MyClass
  11 @end
  12
  13 @interface MyOtherClass <MyProtocol>
  14 - (void) foo;
  15 @end
  16
  17 int main()
  18 {
  19   id obj = nil;
  20   id<MyProtocol> obj_p = nil;
  21   MyClass *obj_c = nil;
  22   MyOtherClass *obj_cp = nil;
  23   Class obj_C = Nil;
  24
  25   /* Assigning to an 'id' variable should never
  26      generate a warning.  */
  27   obj = obj_p;  /* Ok  */
  28   obj = obj_c;  /* Ok  */
  29   obj = obj_cp; /* Ok  */
  30   obj = obj_C;  /* Ok  */
  31
  32   /* Assigning to a 'MyClass *' variable should always generate a
  33      warning, unless done from an 'id'.  */
  34   obj_c = obj;    /* Ok */
  35   obj_c = obj_p;  /* { dg-warning "incompatible pointer type" } */
  36   obj_c = obj_cp; /* { dg-warning "incompatible pointer type" } */
  37   obj_c = obj_C;  /* { dg-warning "incompatible pointer type" } */
  38
  39   /* Assigning to an 'id<MyProtocol>' variable should generate a
  40      warning if done from a 'MyClass *' (which doesn't implement
  41      MyProtocol), but not from an 'id' or from a 'MyOtherClass *'
  42      (which implements MyProtocol).  */
  43   obj_p = obj;    /* Ok */
  44   obj_p = obj_c;  /* { dg-warning "does not implement" } */
  45   obj_p = obj_cp; /* Ok  */
  46   obj_p = obj_C;  /* { dg-warning "incompatible pointer type" } */
  47
  48   /* Assigning to a 'MyOtherClass *' variable should always generate
  49      a warning, unless done from an 'id'  */
  50   obj_cp = obj;    /* Ok */
  51   obj_cp = obj_c;  /* { dg-warning "incompatible pointer type" } */
  52   obj_cp = obj_p;  /* { dg-warning "incompatible pointer type" } */
  53   obj_cp = obj_C;  /* { dg-warning "incompatible pointer type" } */
  54
  55   /* Any comparison involving an 'id' must be without warnings.  */
  56   if (obj == obj_p) ;  /* Ok  */ /*Bogus warning here in 2.95.4*/
  57   if (obj_p == obj) ;  /* Ok  */
  58   if (obj == obj_c) ;  /* Ok  */
  59   if (obj_c == obj) ;  /* Ok  */
  60   if (obj == obj_cp) ; /* Ok  */
  61   if (obj_cp == obj) ; /* Ok  */
  62   if (obj == obj_C) ;  /* Ok  */
  63   if (obj_C == obj) ;  /* Ok  */
  64
  65   /* Any comparison between 'MyClass *' and anything which is not an 'id'
  66      must generate a warning.  */
  67   if (obj_c == obj_p) ; /* { dg-warning "does not implement" } */
  68   if (obj_p == obj_c) ; /* { dg-warning "does not implement" } */
  69   if (obj_c == obj_cp) ; /* { dg-warning "lacks a cast" } */
  70   if (obj_cp == obj_c) ; /* { dg-warning "lacks a cast" } */
  71   if (obj_c == obj_C) ;  /* { dg-warning "lacks a cast" } */
  72   if (obj_C == obj_c) ;  /* { dg-warning "lacks a cast" } */
  73
  74   /* Any comparison between 'MyOtherClass *' (which implements
  75      MyProtocol) and an 'id' implementing MyProtocol are Ok.  */
  76   if (obj_cp == obj_p) ; /* Ok */
  77   if (obj_p == obj_cp) ; /* Ok */
  78
  79
  80   if (obj_p == obj_C) ; /* { dg-warning "lacks a cast" } */
  81   if (obj_C == obj_p) ; /* { dg-warning "lacks a cast" } */
  82   if (obj_cp == obj_C) ; /* { dg-warning "lacks a cast" } */
  83   if (obj_C == obj_cp) ; /* { dg-warning "lacks a cast" } */
  84
  85   return 0;
  86 }