Fixed class_get_super_class() so that it actually works and simplified class_getSuperclass() to call it directly. This fixes numerous other corner cases, for example you can now throw a constant string as an exception and have it work correctly even if no constant string objects have been sent messages.

Hopefully this will fix a few other Heisenbugs and reduce the strength of the Mottola Effect.

objc/objc-api.h

@@ -550,7 +550,16 @@ class_get_meta_class(Class _class)
 static inline Class
 class_get_super_class(Class _class)
 {
-  return CLS_ISCLASS(_class)?_class->super_class:Nil;
+	void __objc_resolve_class_links(void);
+	if CLS_ISCLASS(_class)
+	{
+		if (!CLS_ISRESOLV(_class))
+		{
+			__objc_resolve_class_links();
+		}
+		return _class->super_class;
+	}
+	return Nil;
 }
 
 static inline int

runtime.c

@@ -397,10 +397,6 @@ const char * class_getName(Class cls)
 void __objc_resolve_class_links(void);
 Class class_getSuperclass(Class cls)
 {
-	if (!CLS_ISRESOLV(cls))
-	{
-		__objc_resolve_class_links();
-	}
 	return class_get_super_class(cls);
 }