In libobjc/: 2010-12-21 Nicola Pero <nicola.pero@meta-innovation.com>

In libobjc/:
2010-12-21  Nicola Pero  <nicola.pero@meta-innovation.com>

	PR libobjc/18764
	* class.c (__objc_add_class_to_hash): Return YES if the class was
	added, and NO if it already existed.
	* init.c (__objc_init_class): If __objc_add_class_to_hash returns
	NO, then abort the program with an error message.
	* objc-private/runtime.h (__objc_add_class_to_hash): Updated
	declaration.

From-SVN: r168139

1 files changed, 18 insertions, 10 deletions

diff --git a/libobjc/class.c b/libobjc/class.c
index cf8e4c42728..b9e8730beb2 100644
--- a/libobjc/class.c
+++ b/libobjc/class.c
@@ -446,11 +446,12 @@ __objc_init_class_tables (void)
 }  
 
 /* This function adds a class to the class hash table, and assigns the
-   class a number, unless it's already known.  */
-void
+   class a number, unless it's already known.  Return 'YES' if the
+   class was added.  Return 'NO' if the class was already known.  */
+BOOL
 __objc_add_class_to_hash (Class class)
 {
-  Class h_class;
+  Class existing_class;
 
   objc_mutex_lock (__objc_runtime_mutex);
 
@@ -461,21 +462,28 @@ __objc_add_class_to_hash (Class class)
   assert (CLS_ISCLASS (class));
 
   /* Check to see if the class is already in the hash table.  */
-  h_class = class_table_get_safe (class->name);
-  if (! h_class)
+  existing_class = class_table_get_safe (class->name);
+
+  if (existing_class)
+    {
+      objc_mutex_unlock (__objc_runtime_mutex);
+      return NO;      
+    }
+  else
     {
-      /* The class isn't in the hash table.  Add the class and assign a class
-         number.  */
+      /* The class isn't in the hash table.  Add the class and assign
+         a class number.  */
       static unsigned int class_number = 1;
-
+      
       CLS_SETNUMBER (class, class_number);
       CLS_SETNUMBER (class->class_pointer, class_number);
 
       ++class_number;
       class_table_insert (class->name, class);
-    }
 
-  objc_mutex_unlock (__objc_runtime_mutex);
+      objc_mutex_unlock (__objc_runtime_mutex);
+      return YES;
+    }
 }
 
 Class