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@ -1,5 +1,5 @@
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/* GNU Objective C Runtime initialization
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Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
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Copyright (C) 1993, 1995, 1996, 1997, 2002 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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+load support contributed by Ovidiu Predescu <ovidiu@net-community.com>
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@ -27,14 +27,14 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "runtime.h"
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/* The version number of this runtime. This must match the number
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defined in gcc (objc-act.c) */
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defined in gcc (objc-act.c). */
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#define OBJC_VERSION 8
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#define PROTOCOL_VERSION 2
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/* This list contains all modules currently loaded into the runtime */
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/* This list contains all modules currently loaded into the runtime. */
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static struct objc_list *__objc_module_list = 0; /* !T:MUTEX */
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/* This list contains all proto_list's not yet assigned class links */
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/* This list contains all proto_list's not yet assigned class links. */
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static struct objc_list *unclaimed_proto_list = 0; /* !T:MUTEX */
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/* List of unresolved static instances. */
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@ -46,19 +46,19 @@ objc_mutex_t __objc_runtime_mutex = 0;
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/* Number of threads that are alive. */
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int __objc_runtime_threads_alive = 1; /* !T:MUTEX */
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/* Check compiler vs runtime version */
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/* Check compiler vs runtime version. */
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static void init_check_module_version (Module_t);
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/* Assign isa links to protos */
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/* Assign isa links to protos. */
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static void __objc_init_protocols (struct objc_protocol_list *protos);
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/* Add protocol to class */
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/* Add protocol to class. */
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static void __objc_class_add_protocols (Class, struct objc_protocol_list *);
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/* This is a hook which is called by __objc_exec_class every time a class
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or a category is loaded into the runtime. This may e.g. help a
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dynamic loader determine the classes that have been loaded when
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an object file is dynamically linked in */
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/* This is a hook which is called by __objc_exec_class every time a
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class or a category is loaded into the runtime. This may e.g. help
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a dynamic loader determine the classes that have been loaded when
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an object file is dynamically linked in. */
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void (*_objc_load_callback) (Class class, Category *category); /* !T:SAFE */
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/* Is all categories/classes resolved? */
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@ -72,11 +72,11 @@ __sel_register_typed_name (const char *name, const char *types,
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static void objc_send_load (void);
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/* Inserts all the classes defined in module in a tree of classes that
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resembles the class hierarchy. This tree is traversed in preorder and the
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classes in its nodes receive the +load message if these methods were not
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executed before. The algorithm ensures that when the +load method of a class
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is executed all the superclasses have been already received the +load
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message. */
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resembles the class hierarchy. This tree is traversed in preorder
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and the classes in its nodes receive the +load message if these
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methods were not executed before. The algorithm ensures that when
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the +load method of a class is executed all the superclasses have
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been already received the +load message. */
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static void __objc_create_classes_tree (Module_t module);
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static void __objc_call_callback (Module_t module);
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@ -90,19 +90,21 @@ typedef struct objc_class_tree {
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struct objc_list *subclasses; /* `head' is pointer to an objc_class_tree */
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} objc_class_tree;
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/* This is a linked list of objc_class_tree trees. The head of these trees
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are root classes (their super class is Nil). These different trees
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represent different class hierarchies. */
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/* This is a linked list of objc_class_tree trees. The head of these
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trees are root classes (their super class is Nil). These different
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trees represent different class hierarchies. */
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static struct objc_list *__objc_class_tree_list = NULL;
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/* Keeps the +load methods who have been already executed. This hash should
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not be destroyed during the execution of the program. */
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/* Keeps the +load methods who have been already executed. This hash
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should not be destroyed during the execution of the program. */
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static cache_ptr __objc_load_methods = NULL;
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/* Creates a tree of classes whose topmost class is directly inherited from
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`upper' and the bottom class in this tree is `bottom_class'. The classes
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in this tree are super classes of `bottom_class'. `subclasses' member
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of each tree node point to the next subclass tree node. */
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/* Creates a tree of classes whose topmost class is directly inherited
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from `upper' and the bottom class in this tree is
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`bottom_class'. The classes in this tree are super classes of
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`bottom_class'. `subclasses' member of each tree node point to the
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next subclass tree node. */
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static objc_class_tree *
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create_tree_of_subclasses_inherited_from (Class bottom_class, Class upper)
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{
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@ -134,11 +136,13 @@ create_tree_of_subclasses_inherited_from (Class bottom_class, Class upper)
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return tree;
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}
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/* Insert the `class' into the proper place in the `tree' class hierarchy. This
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function returns a new tree if the class has been successfully inserted into
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the tree or NULL if the class is not part of the classes hierarchy described
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by `tree'. This function is private to objc_tree_insert_class(), you should
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not call it directly. */
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/* Insert the `class' into the proper place in the `tree' class
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hierarchy. This function returns a new tree if the class has been
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successfully inserted into the tree or NULL if the class is not
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part of the classes hierarchy described by `tree'. This function is
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private to objc_tree_insert_class (), you should not call it
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directly. */
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static objc_class_tree *
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__objc_tree_insert_class (objc_class_tree *tree, Class class)
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{
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@ -186,12 +190,13 @@ __objc_tree_insert_class (objc_class_tree *tree, Class class)
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}
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else
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{
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/* The class is not a direct subclass of tree->class. Search for class's
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superclasses in the list of subclasses. */
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/* The class is not a direct subclass of tree->class. Search for
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class's superclasses in the list of subclasses. */
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struct objc_list *subclasses = tree->subclasses;
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/* Precondition: the class must be a subclass of tree->class; otherwise
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return NULL to indicate our caller that it must take the next tree. */
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/* Precondition: the class must be a subclass of tree->class;
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otherwise return NULL to indicate our caller that it must
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take the next tree. */
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if (! class_is_subclass_of_class (class, tree->class))
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return NULL;
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@ -201,9 +206,9 @@ __objc_tree_insert_class (objc_class_tree *tree, Class class)
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if (class_is_subclass_of_class (class, aClass))
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{
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/* If we found one of class's superclasses we insert the class
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into its subtree and return the original tree since nothing
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has been changed. */
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/* If we found one of class's superclasses we insert the
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class into its subtree and return the original tree
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since nothing has been changed. */
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subclasses->head
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= __objc_tree_insert_class (subclasses->head, class);
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DEBUG_PRINTF ("4. class %s inserted\n", class->name);
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@ -211,9 +216,9 @@ __objc_tree_insert_class (objc_class_tree *tree, Class class)
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}
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}
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/* We haven't found a subclass of `class' in the `subclasses' list.
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Create a new tree of classes whose topmost class is a direct subclass
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of tree->class. */
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/* We haven't found a subclass of `class' in the `subclasses'
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list. Create a new tree of classes whose topmost class is a
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direct subclass of tree->class. */
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{
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objc_class_tree *new_tree
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= create_tree_of_subclasses_inherited_from (class, tree->class);
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@ -225,6 +230,7 @@ __objc_tree_insert_class (objc_class_tree *tree, Class class)
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}
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/* This function inserts `class' in the right tree hierarchy classes. */
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static void
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objc_tree_insert_class (Class class)
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{
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@ -244,8 +250,8 @@ objc_tree_insert_class (Class class)
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list_node = list_node->tail;
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}
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/* If the list was finished but the class hasn't been inserted, insert it
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here. */
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/* If the list was finished but the class hasn't been inserted,
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insert it here. */
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if (! list_node)
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{
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__objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
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@ -254,6 +260,7 @@ objc_tree_insert_class (Class class)
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}
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/* Traverse tree in preorder. Used to send +load. */
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static void
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objc_preorder_traverse (objc_class_tree *tree,
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int level,
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@ -267,6 +274,7 @@ objc_preorder_traverse (objc_class_tree *tree,
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}
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/* Traverse tree in postorder. Used to destroy a tree. */
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static void
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objc_postorder_traverse (objc_class_tree *tree,
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int level,
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@ -280,6 +288,7 @@ objc_postorder_traverse (objc_class_tree *tree,
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}
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/* Used to print a tree class hierarchy. */
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#ifdef DEBUG_RUNTIME
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static void
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__objc_tree_print (objc_class_tree *tree, int level)
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@ -292,10 +301,12 @@ __objc_tree_print (objc_class_tree *tree, int level)
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}
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#endif
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/* Walks on a linked list of methods in the reverse order and executes all
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the methods corresponding to `op' selector. Walking in the reverse order
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assures the +load of class is executed first and then +load of categories
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because of the way in which categories are added to the class methods. */
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/* Walks on a linked list of methods in the reverse order and executes
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all the methods corresponding to `op' selector. Walking in the
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reverse order assures the +load of class is executed first and then
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+load of categories because of the way in which categories are
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added to the class methods. */
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static void
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__objc_send_message_in_list (MethodList_t method_list, Class class, SEL op)
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{
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@ -315,21 +326,22 @@ __objc_send_message_in_list (MethodList_t method_list, Class class, SEL op)
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if (mth->method_name && sel_eq (mth->method_name, op)
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&& ! hash_is_key_in_hash (__objc_load_methods, mth->method_imp))
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{
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/* The method was found and wasn't previously executed. */
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(*mth->method_imp) ((id)class, mth->method_name);
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/* Add this method into the +load hash table */
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hash_add (&__objc_load_methods, mth->method_imp, mth->method_imp);
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DEBUG_PRINTF ("sending +load in class: %s\n", class->name);
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/* The method was found and wasn't previously executed. */
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(*mth->method_imp) ((id)class, mth->method_name);
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break;
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}
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}
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}
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static void
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__objc_send_load (objc_class_tree *tree, int level)
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__objc_send_load (objc_class_tree *tree,
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int level __attribute__ ((__unused__)))
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{
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static SEL load_sel = 0;
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Class class = tree->class;
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@ -342,13 +354,15 @@ __objc_send_load (objc_class_tree *tree, int level)
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}
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static void
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__objc_destroy_class_tree_node (objc_class_tree *tree, int level)
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__objc_destroy_class_tree_node (objc_class_tree *tree,
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int level __attribute__ ((__unused__)))
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{
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objc_free (tree);
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}
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/* This is used to check if the relationship between two classes before the
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runtime completely installs the classes. */
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/* This is used to check if the relationship between two classes
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before the runtime completely installs the classes. */
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static BOOL
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class_is_subclass_of_class (Class class, Class superclass)
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{
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@ -364,12 +378,12 @@ class_is_subclass_of_class (Class class, Class superclass)
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return NO;
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}
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/* This list contains all the classes in the runtime system for whom their
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superclasses are not yet know to the runtime. */
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/* This list contains all the classes in the runtime system for whom
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their superclasses are not yet known to the runtime. */
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static struct objc_list *unresolved_classes = 0;
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/* Extern function used to reference the Object and NXConstantString classes.
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*/
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/* Extern function used to reference the Object and NXConstantString
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classes. */
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extern void __objc_force_linking (void);
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@ -380,8 +394,9 @@ __objc_force_linking (void)
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__objc_linking ();
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}
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/* Run through the statics list, removing modules as soon as all its statics
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have been initialized. */
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/* Run through the statics list, removing modules as soon as all its
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statics have been initialized. */
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static void
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objc_init_statics (void)
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{
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@ -440,9 +455,9 @@ objc_init_statics (void)
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} /* objc_init_statics */
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/* This function is called by constructor functions generated for each
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module compiled. (_GLOBAL_$I$...) The purpose of this function is to
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gather the module pointers so that they may be processed by the
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initialization routines as soon as possible */
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module compiled. (_GLOBAL_$I$...) The purpose of this function is
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to gather the module pointers so that they may be processed by the
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initialization routines as soon as possible. */
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objc_DECLARE void
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__objc_exec_class (Module_t module)
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@ -599,9 +614,7 @@ __objc_exec_class (Module_t module)
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/* Scan the unclaimed category hash. Attempt to attach any unclaimed
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categories to objects. */
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for (cell = &unclaimed_categories;
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*cell;
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({ if (*cell) cell = &(*cell)->tail; }))
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for (cell = &unclaimed_categories; *cell; )
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{
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Category_t category = (*cell)->head;
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Class class = objc_lookup_class (category->class_name);
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@ -630,11 +643,14 @@ __objc_exec_class (Module_t module)
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only done for root classes. */
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__objc_register_instance_methods_to_class (class);
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}
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else
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cell = &(*cell)->tail;
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}
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if (unclaimed_proto_list && objc_lookup_class ("Protocol"))
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{
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list_mapcar (unclaimed_proto_list,(void(*)(void*))__objc_init_protocols);
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list_mapcar (unclaimed_proto_list,
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(void (*) (void *))__objc_init_protocols);
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list_free (unclaimed_proto_list);
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unclaimed_proto_list = 0;
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}
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@ -644,15 +660,16 @@ __objc_exec_class (Module_t module)
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objc_mutex_unlock (__objc_runtime_mutex);
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}
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static void objc_send_load (void)
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static void
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objc_send_load (void)
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{
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if (! __objc_module_list)
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return;
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/* Try to find out if all the classes loaded so far also have their
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superclasses known to the runtime. We suppose that the objects that are
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allocated in the +load method are in general of a class declared in the
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same module. */
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superclasses known to the runtime. We suppose that the objects
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that are allocated in the +load method are in general of a class
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declared in the same module. */
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if (unresolved_classes)
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{
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Class class = unresolved_classes->head;
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@ -666,10 +683,9 @@ static void objc_send_load (void)
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break;
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}
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/*
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* If we still have classes for whom we don't have yet their super
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|
* classes known to the runtime we don't send the +load messages.
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*/
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/* If we still have classes for whom we don't have yet their
|
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|
super classes known to the runtime we don't send the +load
|
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|
messages. */
|
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|
if (unresolved_classes)
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|
return;
|
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|
}
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@ -693,10 +709,11 @@ static void objc_send_load (void)
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|
return;
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|
|
#endif
|
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|
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|
|
/* Iterate over all modules in the __objc_module_list and call on them the
|
|
|
|
|
__objc_create_classes_tree function. This function creates a tree of
|
|
|
|
|
classes that resembles the class hierarchy. */
|
|
|
|
|
list_mapcar (__objc_module_list, (void(*)(void*))__objc_create_classes_tree);
|
|
|
|
|
/* Iterate over all modules in the __objc_module_list and call on
|
|
|
|
|
them the __objc_create_classes_tree function. This function
|
|
|
|
|
creates a tree of classes that resembles the class hierarchy. */
|
|
|
|
|
list_mapcar (__objc_module_list,
|
|
|
|
|
(void (*) (void *)) __objc_create_classes_tree);
|
|
|
|
|
|
|
|
|
|
while (__objc_class_tree_list)
|
|
|
|
|
{
|
|
|
|
|
@ -724,8 +741,8 @@ __objc_create_classes_tree (Module_t module)
|
|
|
|
|
Symtab_t symtab = module->symtab;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
/* Iterate thru classes defined in this module and insert them in the classes
|
|
|
|
|
tree hierarchy. */
|
|
|
|
|
/* Iterate thru classes defined in this module and insert them in
|
|
|
|
|
the classes tree hierarchy. */
|
|
|
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
|
|
|
|
{
|
|
|
|
|
Class class = (Class) symtab->defs[i];
|
|
|
|
|
@ -737,13 +754,13 @@ __objc_create_classes_tree (Module_t module)
|
|
|
|
|
static void
|
|
|
|
|
__objc_call_callback (Module_t module)
|
|
|
|
|
{
|
|
|
|
|
/* The runtime mutex is locked in this point */
|
|
|
|
|
/* The runtime mutex is locked in this point. */
|
|
|
|
|
|
|
|
|
|
Symtab_t symtab = module->symtab;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
/* Iterate thru classes defined in this module and call the callback for
|
|
|
|
|
each one. */
|
|
|
|
|
/* Iterate thru classes defined in this module and call the callback
|
|
|
|
|
for each one. */
|
|
|
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
|
|
|
|
{
|
|
|
|
|
Class class = (Class) symtab->defs[i];
|
|
|
|
|
@ -753,9 +770,9 @@ __objc_call_callback (Module_t module)
|
|
|
|
|
_objc_load_callback (class, 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Call the _objc_load_callback for categories. Don't register the instance
|
|
|
|
|
methods as class methods for categories to root classes since they were
|
|
|
|
|
already added in the class. */
|
|
|
|
|
/* Call the _objc_load_callback for categories. Don't register the
|
|
|
|
|
instance methods as class methods for categories to root classes
|
|
|
|
|
since they were already added in the class. */
|
|
|
|
|
for (i = 0; i < symtab->cat_def_cnt; i++)
|
|
|
|
|
{
|
|
|
|
|
Category_t category = symtab->defs[i + symtab->cls_def_cnt];
|
|
|
|
|
@ -766,8 +783,10 @@ __objc_call_callback (Module_t module)
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Sanity check the version of gcc used to compile `module'*/
|
|
|
|
|
static void init_check_module_version(Module_t module)
|
|
|
|
|
/* Sanity check the version of gcc used to compile `module'. */
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
init_check_module_version (Module_t module)
|
|
|
|
|
{
|
|
|
|
|
if ((module->version != OBJC_VERSION) || (module->size != sizeof (Module)))
|
|
|
|
|
{
|
|
|
|
|
@ -788,7 +807,7 @@ static void init_check_module_version(Module_t module)
|
|
|
|
|
static void
|
|
|
|
|
__objc_init_protocols (struct objc_protocol_list *protos)
|
|
|
|
|
{
|
|
|
|
|
int i;
|
|
|
|
|
size_t i;
|
|
|
|
|
static Class proto_class = 0;
|
|
|
|
|
|
|
|
|
|
if (! protos)
|
|
|
|
|
@ -825,7 +844,8 @@ __objc_init_protocols (struct objc_protocol_list* protos)
|
|
|
|
|
{
|
|
|
|
|
objc_error (nil, OBJC_ERR_PROTOCOL_VERSION,
|
|
|
|
|
"Version %d doesn't match runtime protocol version %d\n",
|
|
|
|
|
(int)((char*)protos->list[i]->class_pointer-(char*)0),
|
|
|
|
|
(int) ((char *) protos->list[i]->class_pointer
|
|
|
|
|
- (char *) 0),
|
|
|
|
|
PROTOCOL_VERSION);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
@ -833,8 +853,8 @@ __objc_init_protocols (struct objc_protocol_list* protos)
|
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __objc_class_add_protocols (Class class,
|
|
|
|
|
struct objc_protocol_list* protos)
|
|
|
|
|
static void
|
|
|
|
|
__objc_class_add_protocols (Class class, struct objc_protocol_list *protos)
|
|
|
|
|
{
|
|
|
|
|
/* Well... */
|
|
|
|
|
if (! protos)
|
|
|
|
|
|
fedor
23 years ago