gcc/testsuite/objc.dg/proto-lossage-1.m

   1 /* Test for situations in which protocol conformance information
   2    may be lost, leading to superfluous warnings.  */
   3 /* Author: Ziemowit Laski <zlaski@apple.com>.  */
   4 /* { dg-do compile } */
   5
   6 /* One-line substitute for objc/objc.h */
   7 typedef struct objc_object { struct objc_class *class_pointer; } *id;
   8
   9 @protocol NSObject
  10 - (int)someValue;
  11 @end
  12
  13 @interface NSObject <NSObject>
  14 @end
  15
  16 @protocol PlateMethods
  17 - (void)someMethod;
  18 @end
  19
  20 @interface Foo {
  21   NSObject <PlateMethods> *plate;
  22   id <PlateMethods> plate1;
  23   NSObject *plate2;
  24 }
  25 - (id <PlateMethods>) getPlate;
  26 - (id <NSObject>) getPlate1;
  27 - (int) getValue;
  28 @end
  29
  30 @implementation Foo
  31 - (id <PlateMethods>) getPlate {
  32   return plate;  /* { dg-bogus "does not implement" } */
  33 }
  34 - (id <NSObject>) getPlate1 {
  35   return (id <NSObject>)plate1; /* { dg-bogus "does not conform" } */
  36 }
  37 - (int) getValue {
  38   int i = [plate1 someValue];   /* { dg-warning "not implemented by protocol" } */
  39   int j = [(id <NSObject>)plate1 someValue];  /* { dg-bogus "not implemented by protocol" } */
  40   int k = [(id)plate1 someValue]; /* { dg-bogus "not implemented by protocol" } */
  41   return i + j + k;
  42 }
  43 @end