X-Git-Url: https://git.saurik.com/apple/objc4.git/blobdiff_plain/7c0e6487d7b67b6bf6c632300ee4b74e8950b051..7af964d1562d70f51a8e9aca24215ac3d83d0624:/test/instanceSize.m

diff --git a/test/instanceSize.m b/test/instanceSize.m
new file mode 100644
index 0000000..14e32e1
--- /dev/null
+++ b/test/instanceSize.m
@@ -0,0 +1,63 @@
+#include "test.h"
+
+#include <objc/runtime.h>
+
+
+@interface Super { id isa; } @end
+@implementation Super 
++(void)initialize { } 
++class { return self; }
++new { return class_createInstance(self, 0); }
+-(void)dealloc { object_dispose(self); }
+@end
+
+@interface Sub1 : Super {
+    // id isa;  // 0..4
+    BOOL b;     // 4..5
+}
+@end
+
+@implementation Sub1 @end
+
+@interface Sub2 : Sub1 {
+    // id isa   // 0..4    0..8
+    // BOOL b   // 4..5    8..9
+    BOOL b2;    // 5..6    9..10
+    id o;       // 8..12   16..24
+}
+@end
+@implementation Sub2 @end
+
+@interface Sub3 : Sub1 {
+    // id isa;  // 0..4    0..8
+    // BOOL b;  // 4..5    8..9
+    id o;       // 8..12   16..24
+    BOOL b2;    // 12..13  24..25
+}
+@end
+@implementation Sub3 @end
+
+int main()
+{
+    testassert(sizeof(id) == class_getInstanceSize([Super class]));
+    testassert(2*sizeof(id) == class_getInstanceSize([Sub1 class]));
+    testassert(3*sizeof(id) == class_getInstanceSize([Sub2 class]));
+    testassert(4*sizeof(id) == class_getInstanceSize([Sub3 class]));
+
+    id o;
+
+    o = [Super new];
+    testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
+    [o dealloc];
+    o = [Sub1 new];
+    testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
+    [o dealloc];
+    o = [Sub2 new];
+    testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
+    [o dealloc];
+    o = [Sub3 new];
+    testassert(object_getIndexedIvars(o) == (char *)o + class_getInstanceSize(o->isa));
+    [o dealloc];
+
+    succeed(__FILE__);
+}