static void objc_send_load (void);
/* Inserts all the classes defined in module in a tree of classes that
- resembles the class hierarchy. This tree is traversed in preorder
+ resembles the class hierarchy. This tree is traversed in preorder
and the classes in its nodes receive the +load message if these
- methods were not executed before. The algorithm ensures that when
+ methods were not executed before. The algorithm ensures that when
the +load method of a class is executed all the superclasses have
been already received the +load message. */
static void __objc_create_classes_tree (struct objc_module *module);
installed in the runtime. */
static BOOL class_is_subclass_of_class (Class class, Class superclass);
+/* This is a node in the class tree hierarchy used to send +load
+ messages. */
typedef struct objc_class_tree
{
+ /* The class corresponding to the node. */
Class class;
- struct objc_list *subclasses; /* `head' is a pointer to an
- objc_class_tree. */
+
+ /* This is a linked list of all the direct subclasses of this class.
+ 'head' points to a subclass node; 'tail' points to the next
+ objc_list node (whose 'head' points to another subclass node,
+ etc). */
+ struct objc_list *subclasses;
} objc_class_tree;
-/* This is a linked list of objc_class_tree trees. The head of these
- trees are root classes (their super class is Nil). These different
+/* This is a linked list of objc_class_tree trees. The head of these
+ trees are root classes (their super class is Nil). These different
trees represent different class hierarchies. */
static struct objc_list *__objc_class_tree_list = NULL;
is really needed so that superclasses will get the message before
subclasses.
- This tree will contain classes which are being loaded (or have just
+ This tree may contain classes which are being loaded (or have just
being loaded), and whose super_class pointers have not yet been
resolved. This implies that their super_class pointers point to a
string with the name of the superclass; when the first message is
/* Creates a tree of classes whose topmost class is directly inherited
- from `upper' and the bottom class in this tree is
- `bottom_class'. The classes in this tree are super classes of
- `bottom_class'. `subclasses' member of each tree node point to the
- next subclass tree node. */
+ from `upper' and the bottom class in this tree is `bottom_class'.
+ If `upper' is Nil, creates a class hierarchy up to a root class.
+ The classes in this tree are super classes of `bottom_class'. The
+ `subclasses' member of each tree node point to the list of
+ subclasses for the node. */
static objc_class_tree *
create_tree_of_subclasses_inherited_from (Class bottom_class, Class upper)
{
Class superclass;
objc_class_tree *tree, *prev;
- if (bottom_class->super_class)
- superclass = objc_getClass ((char *) bottom_class->super_class);
- else
- superclass = Nil;
-
DEBUG_PRINTF ("create_tree_of_subclasses_inherited_from:");
DEBUG_PRINTF (" bottom_class = %s, upper = %s\n",
(bottom_class ? bottom_class->name : NULL),
(upper ? upper->name : NULL));
- tree = prev = objc_calloc (1, sizeof (objc_class_tree));
+ superclass = class_superclass_of_class (bottom_class);
+
+ prev = objc_calloc (1, sizeof (objc_class_tree));
prev->class = bottom_class;
+ if (superclass == upper)
+ return prev;
+
while (superclass != upper)
{
tree = objc_calloc (1, sizeof (objc_class_tree));
}
/* Insert the `class' into the proper place in the `tree' class
- hierarchy. This function returns a new tree if the class has been
+ hierarchy. This function returns a new tree if the class has been
successfully inserted into the tree or NULL if the class is not
- part of the classes hierarchy described by `tree'. This function is
- private to objc_tree_insert_class (), you should not call it
+ part of the classes hierarchy described by `tree'. This function
+ is private to objc_tree_insert_class (), you should not call it
directly. */
static objc_class_tree *
__objc_tree_insert_class (objc_class_tree *tree, Class class)
{
- DEBUG_PRINTF ("__objc_tree_insert_class: tree = %p, class = %s\n",
- tree, class->name);
+ DEBUG_PRINTF ("__objc_tree_insert_class: tree = %p (root: %s), class = %s\n",
+ tree, ((tree && tree->class) ? tree->class->name : "Nil"), class->name);
if (tree == NULL)
return create_tree_of_subclasses_inherited_from (class, NULL);
{
struct objc_list *list_node;
objc_class_tree *tree;
-
+
list_node = __objc_class_tree_list;
while (list_node)
{
+ /* Try to insert the class in this class hierarchy. */
tree = __objc_tree_insert_class (list_node->head, class);
if (tree)
{
list_node->head = tree;
- break;
+ return;
}
else
list_node = list_node->tail;
}
-
- /* If the list was finished but the class hasn't been inserted,
- insert it here. */
- if (! list_node)
- {
- __objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
- __objc_class_tree_list->head = __objc_tree_insert_class (NULL, class);
- }
+
+ /* If the list was finished but the class hasn't been inserted, we
+ don't have an existing class hierarchy that can accomodate it.
+ Create a new one. */
+ __objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
+ __objc_class_tree_list->head = __objc_tree_insert_class (NULL, class);
}
/* Traverse tree in preorder. Used to send +load. */
duplicate_classes = objc_hash_new (8,
(hash_func_type)objc_hash_ptr,
objc_compare_ptrs);
- __objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
__objc_load_methods = objc_hash_new (128,
(hash_func_type)objc_hash_ptr,
objc_compare_ptrs);
assert (CLS_ISMETA (class->class_pointer));
DEBUG_PRINTF (" installing class '%s'\n", class->name);
+ /* Workaround for a bug in clang: Clang may set flags other than
+ _CLS_CLASS and _CLS_META even when compiling for the
+ traditional ABI (version 8), confusing our runtime. Try to
+ wipe these flags out. */
+ if (CLS_ISCLASS (class))
+ __CLS_INFO (class) = _CLS_CLASS;
+ else
+ __CLS_INFO (class) = _CLS_META;
+
/* Initialize the subclass list to be NULL. In some cases it
isn't and this crashes the program. */
class->subclass_list = NULL;
OSDN Git Service
