backport bugfixes from ObjectiveC2 code

objc/objc-api.h

@@ -550,12 +550,17 @@ class_get_meta_class(Class _class)
 static inline Class
 class_get_super_class(Class _class)
 {
-	void __objc_resolve_class_links(void);
+  if (!CLS_ISRESOLV(cls))
-	if (!CLS_ISRESOLV(_class))
     {
-		__objc_resolve_class_links();
+      /* This class is not yet resolved ... so lookup superclass by name.
+       * We need to allow for this case because we might doing a lookup in
+       * a class which has not yet been registered with the runtime and
+       * which might have ivars or methods added after this call (so we
+       * mustn't resolve this class now).
+       */
+      return (Class)objc_getClass((const char*)cls->super_class);
     }
-	return _class->super_class;
+  return cls->super_class;
 }
 
 static inline int

runtime.c

@@ -124,21 +124,25 @@ static void objc_updateDtableForClassContainingMethod(Method m)
 	}
 }
 
-
+BOOL
-BOOL class_addIvar(Class cls,
+class_addIvar(Class cls, const char *name,
-                   const char *name,
+  size_t size, uint8_t alignment, const char *types)
-                   size_t size,
-                   uint8_t alignment,
-                   const char *types)
 {
+  struct objc_ivar_list *ivarlist;
+  unsigned off;
+  Ivar ivar;
+
   if (CLS_ISRESOLV(cls) || CLS_ISMETA(cls))
     {
       return NO;
     }
 
-	struct objc_ivar_list *ivarlist = cls->ivars;
+  if (class_getInstanceVariable(cls, name) != NULL)
+    {
+      return NO;
+    }
 
-	if (class_getInstanceVariable(cls, name) != NULL) { return NO; }
+  ivarlist = cls->ivars;
 
   if (NULL == ivarlist)
     {
@@ -150,14 +154,18 @@ BOOL class_addIvar(Class cls,
       ivarlist->ivar_count++;
       // objc_ivar_list contains one ivar.  Others follow it.
       cls->ivars = objc_realloc(ivarlist, sizeof(struct objc_ivar_list)
-				+ (ivarlist->ivar_count - 1) * sizeof(struct objc_ivar));
+				+ (ivarlist->ivar_count -
+				   1) * sizeof(struct objc_ivar));
     }
 
-	Ivar ivar = &cls->ivars->ivar_list[cls->ivars->ivar_count - 1];
+  ivar = &cls->ivars->ivar_list[cls->ivars->ivar_count - 1];
   ivar->ivar_name = strdup(name);
   ivar->ivar_type = strdup(types);
   // Round up the offset of the ivar so it is correctly aligned.
-	ivar->ivar_offset = cls->instance_size + (cls->instance_size % alignment);
+  off = cls->instance_size >> alignment;
+  if (off << alignment != cls->instance_size)
+    off = (off + 1) << alignment;
+  ivar->ivar_offset = off;
   // Increase the instance size to make space for this.
   cls->instance_size = ivar->ivar_offset + size;
   return YES;