Add OBJC_SMALL_OBJECT_SHIFT macro.

15 years ago · 22e5aaf7b0
parent f3d2b7034c
commit 22e5aaf7b0
1 changed files with 4 additions and 0 deletions
--- a/objc/runtime.h
+++ b/objc/runtime.h
@ -749,6 +749,10 @@ BOOL objc_registerSmallObjectClass_np(Class cls, uintptr_t classId);
 * This restriction may be relaxed in the future on 64-bit systems.
 */
 #define OBJC_SMALL_OBJECT_MASK ((sizeof(id) == 4) ? 1 : 7)
+/**
+ * The number of bits reserved for the class identifier in a small object.
+ */
+#define OBJC_SMALL_OBJECT_SHIFT ((sizeof(id) == 4) ? 1 : 3)


 /**