test/badSuperclass.m

   1 // TEST_CRASHES
   2 /*
   3 TEST_RUN_OUTPUT
   4 objc\[\d+\]: Memory corruption in class list\.
   5 objc\[\d+\]: HALTED
   6 END
   7 */
   8
   9 #include "test.h"
  10 #include "testroot.i"
  11
  12 @interface Super : TestRoot @end
  13 @implementation Super @end
  14
  15 @interface Sub : Super @end
  16 @implementation Sub @end
  17
  18 int main()
  19 {
  20     alarm(10);
  21
  22     Class supercls = [Super class];
  23     Class subcls = [Sub class];
  24     id subobj __unused = [Sub alloc];
  25
  26     // Create a cycle in a superclass chain (Sub->supercls == Sub)
  27     // then attempt to walk that chain. Runtime should halt eventually.
  28     _objc_flush_caches(supercls);
  29     ((Class *)(__bridge void *)subcls)[1] = subcls;
  30 #ifdef CACHE_FLUSH
  31     _objc_flush_caches(supercls);
  32 #else
  33     [subobj class];
  34 #endif
  35
  36     fail("should have crashed");
  37 }