test/instanceSize.m

   1 // TEST_CONFIG
   2
   3 #include "test.h"
   4
   5 #include <objc/runtime.h>
   6
   7
   8 @interface Super { id isa; } @end
   9 @implementation Super
  10 +(void)initialize { }
  11 +class { return self; }
  12 +new { return class_createInstance(self, 0); }
  13 -(void)dealloc { object_dispose(self); }
  14 @end
  15
  16 @interface Sub1 : Super {
  17     // id isa;  // 0..4
  18     BOOL b;     // 4..5
  19 }
  20 @end
  21
  22 @implementation Sub1 @end
  23
  24 @interface Sub2 : Sub1 {
  25     // id isa   // 0..4    0..8
  26     // BOOL b   // 4..5    8..9
  27     BOOL b2;    // 5..6    9..10
  28     id o;       // 8..12   16..24
  29 }
  30 @end
  31 @implementation Sub2 @end
  32
  33 @interface Sub3 : Sub1 {
  34     // id isa;  // 0..4    0..8
  35     // BOOL b;  // 4..5    8..9
  36     id o;       // 8..12   16..24
  37     BOOL b2;    // 12..13  24..25
  38 }
  39 @end
  40 @implementation Sub3 @end
  41
  42 int main()
  43 {
  44     testassert(sizeof(id) == class_getInstanceSize([Super class]));
  45     testassert(2*sizeof(id) == class_getInstanceSize([Sub1 class]));
  46     testassert(3*sizeof(id) == class_getInstanceSize([Sub2 class]));
  47     testassert(4*sizeof(id) == class_getInstanceSize([Sub3 class]));
  48
  49     id o;
  50
  51     o = [Super new];
  52     testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
  53     [o dealloc];
  54     o = [Sub1 new];
  55     testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
  56     [o dealloc];
  57     o = [Sub2 new];
  58     testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
  59     [o dealloc];
  60     o = [Sub3 new];
  61     testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
  62     [o dealloc];
  63
  64     succeed(__FILE__);
  65 }