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@ -38,9 +38,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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#define OBJC2_PROTOCOL_VERSION 3
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void __objc_sync_init(void);
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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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void __objc_resolve_class_links(void);
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void objc_load_class(struct objc_class *class);
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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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@ -55,381 +54,20 @@ objc_mutex_t __objc_runtime_mutex = &objc_runtime_mutex;
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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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void __objc_register_selector_array(SEL selectors, unsigned long count);
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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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static void __objc_init_protocols (struct objc_protocol_list *protos);
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void __objc_init_protocols (struct objc_protocol_list *protos);
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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
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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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BOOL __objc_dangling_categories = NO; /* !T:UNUSED */
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void __objc_register_selector_array(SEL selectors, unsigned long count);
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/* Sends +load to all classes and categories in certain situations. */
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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
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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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/* A special version that works only before the classes are completely
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installed in the runtime. */
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static BOOL class_is_subclass_of_class (Class class, Class superclass);
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extern void *__objc_uninstalled_dtable;
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typedef struct objc_class_tree {
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Class class;
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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
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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
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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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/* This function is used when building the class tree used to send
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ordinately the +load message to all classes needing it. The tree
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is really needed so that superclasses will get the message before
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subclasses.
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This tree will contain classes which are being loaded (or have just
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being loaded), and whose super_class pointers have not yet been
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resolved. This implies that their super_class pointers point to a
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string with the name of the superclass; when the first message is
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sent to the class (/an object of that class) the class links will
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be resolved, which will replace the super_class pointers with
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pointers to the actual superclasses.
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Unfortunately, the tree might also contain classes which had been
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loaded previously, and whose class links have already been
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resolved.
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This function returns the superclass of a class in both cases, and
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can be used to build the determine the class relationships while
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building the tree.
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*/
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static Class class_superclass_of_class (Class class)
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{
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char *super_class_name;
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/* If the class links have been resolved, use the resolved
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* links. */
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if (CLS_ISRESOLV (class))
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return class->super_class;
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/* Else, 'class' has not yet been resolved. This means that its
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* super_class pointer is really the name of the super class (rather
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* than a pointer to the actual superclass). */
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super_class_name = (char *)class->super_class;
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/* Return Nil for a root class. */
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if (super_class_name == NULL)
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return Nil;
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/* Lookup the superclass of non-root classes. */
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return objc_lookup_class (super_class_name);
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}
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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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Class superclass = bottom_class->super_class ?
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objc_lookup_class ((char *) bottom_class->super_class)
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: Nil;
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objc_class_tree *tree, *prev;
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DEBUG_PRINTF ("create_tree_of_subclasses_inherited_from:");
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DEBUG_PRINTF ("bottom_class = %s, upper = %s\n",
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(bottom_class ? bottom_class->name : NULL),
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(upper ? upper->name : NULL));
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tree = prev = objc_calloc (1, sizeof (objc_class_tree));
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prev->class = bottom_class;
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while (superclass != upper)
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{
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tree = objc_calloc (1, sizeof (objc_class_tree));
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tree->class = superclass;
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tree->subclasses = list_cons (prev, tree->subclasses);
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superclass = class_superclass_of_class (superclass);
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prev = tree;
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}
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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
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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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DEBUG_PRINTF ("__objc_tree_insert_class: tree = %x, class = %s\n",
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(int)tree, class->name);
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if (tree == NULL)
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return create_tree_of_subclasses_inherited_from (class, NULL);
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else if (class == tree->class)
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{
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/* `class' has been already inserted */
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DEBUG_PRINTF ("1. class %s was previously inserted\n", class->name);
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return tree;
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}
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else if (class_superclass_of_class (class) == tree->class)
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{
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/* If class is a direct subclass of tree->class then add class to the
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list of subclasses. First check to see if it wasn't already
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inserted. */
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struct objc_list *list = tree->subclasses;
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objc_class_tree *node;
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while (list)
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{
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/* Class has been already inserted; do nothing just return
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the tree. */
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if (((objc_class_tree *) list->head)->class == class)
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{
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DEBUG_PRINTF ("2. class %s was previously inserted\n",
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class->name);
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return tree;
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}
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list = list->tail;
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}
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/* Create a new node class and insert it into the list of subclasses */
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node = objc_calloc (1, sizeof (objc_class_tree));
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node->class = class;
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tree->subclasses = list_cons (node, tree->subclasses);
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DEBUG_PRINTF ("3. class %s inserted\n", class->name);
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return tree;
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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
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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;
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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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for (; subclasses != NULL; subclasses = subclasses->tail)
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{
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Class aClass = ((objc_class_tree *) (subclasses->head))->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
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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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return tree;
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}
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}
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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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tree->subclasses = list_cons (new_tree, tree->subclasses);
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DEBUG_PRINTF ("5. class %s inserted\n", class->name);
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return tree;
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}
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}
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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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struct objc_list *list_node;
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objc_class_tree *tree;
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list_node = __objc_class_tree_list;
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while (list_node)
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{
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tree = __objc_tree_insert_class (list_node->head, class);
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if (tree)
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{
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list_node->head = tree;
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break;
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}
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else
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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,
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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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__objc_class_tree_list->head = __objc_tree_insert_class (NULL, class);
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}
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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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void (*function) (objc_class_tree *, int))
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{
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struct objc_list *node;
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(*function) (tree, level);
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for (node = tree->subclasses; node; node = node->tail)
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objc_preorder_traverse (node->head, level + 1, function);
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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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void (*function) (objc_class_tree *, int))
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{
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struct objc_list *node;
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for (node = tree->subclasses; node; node = node->tail)
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objc_postorder_traverse (node->head, level + 1, function);
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(*function) (tree, level);
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}
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/* Used to print a tree class hierarchy. */
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#ifdef DEBUG
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static void
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__objc_tree_print (objc_class_tree *tree, int level)
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{
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int i;
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for (i = 0; i < level; i++)
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printf (" ");
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printf ("%s\n", tree->class->name);
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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
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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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int i;
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|
|
|
|
|
if (! method_list)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* First execute the `op' message in the following method lists */
|
|
|
|
|
__objc_send_message_in_list (method_list->method_next, class, op);
|
|
|
|
|
|
|
|
|
|
/* Search the method list. */
|
|
|
|
|
for (i = 0; i < method_list->method_count; i++)
|
|
|
|
|
{
|
|
|
|
|
Method_t mth = &method_list->method_list[i];
|
|
|
|
|
|
|
|
|
|
if (mth->method_name && sel_eq (mth->method_name, op)
|
|
|
|
|
&& ! objc_hash_is_key_in_hash (__objc_load_methods, mth->method_imp))
|
|
|
|
|
{
|
|
|
|
|
/* Add this method into the +load hash table */
|
|
|
|
|
objc_hash_add (&__objc_load_methods,
|
|
|
|
|
mth->method_imp,
|
|
|
|
|
mth->method_imp);
|
|
|
|
|
|
|
|
|
|
DEBUG_PRINTF ("sending +load in class: %s\n", class->name);
|
|
|
|
|
|
|
|
|
|
/* The method was found and wasn't previously executed. */
|
|
|
|
|
(*mth->method_imp) ((id)class, mth->method_name);
|
|
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
__objc_send_load (objc_class_tree *tree,
|
|
|
|
|
int level __attribute__ ((__unused__)))
|
|
|
|
|
{
|
|
|
|
|
static SEL load_sel = 0;
|
|
|
|
|
Class class = tree->class;
|
|
|
|
|
MethodList_t method_list = class->class_pointer->methods;
|
|
|
|
|
|
|
|
|
|
if (! load_sel)
|
|
|
|
|
load_sel = sel_register_name ("load");
|
|
|
|
|
|
|
|
|
|
__objc_send_message_in_list (method_list, class, load_sel);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
__objc_destroy_class_tree_node (objc_class_tree *tree,
|
|
|
|
|
int level __attribute__ ((__unused__)))
|
|
|
|
|
{
|
|
|
|
|
objc_free (tree);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* This is used to check if the relationship between two classes
|
|
|
|
|
before the runtime completely installs the classes. */
|
|
|
|
|
|
|
|
|
|
static BOOL
|
|
|
|
|
class_is_subclass_of_class (Class class, Class superclass)
|
|
|
|
|
{
|
|
|
|
|
for (; class != Nil;)
|
|
|
|
|
{
|
|
|
|
|
if (class == superclass)
|
|
|
|
|
return YES;
|
|
|
|
|
class = class_superclass_of_class (class);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return NO;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* This list contains all the classes in the runtime system for whom
|
|
|
|
|
their superclasses are not yet known to the runtime. */
|
|
|
|
|
static struct objc_list *unresolved_classes = 0;
|
|
|
|
|
|
|
|
|
|
/* Extern function used to reference the Object and NXConstantString
|
|
|
|
|
classes. */
|
|
|
|
|
|
|
|
|
|
@ -557,16 +195,11 @@ __objc_exec_class (Module_t module)
|
|
|
|
|
__objc_init_protocol_table ();
|
|
|
|
|
__objc_init_class_tables ();
|
|
|
|
|
__objc_init_dispatch_tables ();
|
|
|
|
|
__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);
|
|
|
|
|
previous_constructors = 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Save the module pointer for later processing. (not currently used) */
|
|
|
|
|
LOCK(__objc_runtime_mutex);
|
|
|
|
|
__objc_module_list = list_cons (module, __objc_module_list);
|
|
|
|
|
|
|
|
|
|
/* Replace referenced selectors from names to SEL's. */
|
|
|
|
|
if (symtab->refs)
|
|
|
|
|
@ -578,40 +211,7 @@ __objc_exec_class (Module_t module)
|
|
|
|
|
DEBUG_PRINTF ("gathering selectors from module: %s\n", module->name);
|
|
|
|
|
for (i = 0; i < symtab->cls_def_cnt; ++i)
|
|
|
|
|
{
|
|
|
|
|
Class class = (Class) symtab->defs[i];
|
|
|
|
|
const char *superclass = (char *) class->super_class;
|
|
|
|
|
|
|
|
|
|
/* Make sure we have what we think. */
|
|
|
|
|
assert (CLS_ISCLASS (class));
|
|
|
|
|
assert (CLS_ISMETA (class->class_pointer));
|
|
|
|
|
DEBUG_PRINTF ("phase 1, processing class: %s\n", class->name);
|
|
|
|
|
|
|
|
|
|
/* Initialize the subclass list to be NULL.
|
|
|
|
|
In some cases it isn't and this crashes the program. */
|
|
|
|
|
class->subclass_list = NULL;
|
|
|
|
|
|
|
|
|
|
/* Store the class in the class table and assign class numbers. */
|
|
|
|
|
__objc_add_class_to_hash (class);
|
|
|
|
|
|
|
|
|
|
/* Register all of the selectors in the class and meta class. */
|
|
|
|
|
__objc_register_selectors_from_class (class);
|
|
|
|
|
__objc_register_selectors_from_class ((Class) class->class_pointer);
|
|
|
|
|
|
|
|
|
|
/* Install the fake dispatch tables */
|
|
|
|
|
class->dtable = __objc_uninstalled_dtable;
|
|
|
|
|
class->class_pointer->dtable = __objc_uninstalled_dtable;
|
|
|
|
|
|
|
|
|
|
/* Register the instance methods as class methods, this is
|
|
|
|
|
only done for root classes. */
|
|
|
|
|
__objc_register_instance_methods_to_class (class);
|
|
|
|
|
|
|
|
|
|
if (class->protocols)
|
|
|
|
|
__objc_init_protocols (class->protocols);
|
|
|
|
|
|
|
|
|
|
/* Check to see if the superclass is known in this point. If it's not
|
|
|
|
|
add the class to the unresolved_classes list. */
|
|
|
|
|
if (superclass && ! objc_lookup_class (superclass))
|
|
|
|
|
unresolved_classes = list_cons (class, unresolved_classes);
|
|
|
|
|
objc_load_class((Class) symtab->defs[i]);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Process category information from the module. */
|
|
|
|
|
@ -703,126 +303,13 @@ __objc_exec_class (Module_t module)
|
|
|
|
|
unclaimed_proto_list = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
objc_send_load ();
|
|
|
|
|
__objc_resolve_class_links();
|
|
|
|
|
|
|
|
|
|
UNLOCK(__objc_runtime_mutex);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
objc_send_load (void)
|
|
|
|
|
{
|
|
|
|
|
if (! __objc_module_list)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* Try to find out if all the classes loaded so far also have their
|
|
|
|
|
superclasses known to the runtime. We suppose that the objects
|
|
|
|
|
that are allocated in the +load method are in general of a class
|
|
|
|
|
declared in the same module. */
|
|
|
|
|
if (unresolved_classes)
|
|
|
|
|
{
|
|
|
|
|
Class class = unresolved_classes->head;
|
|
|
|
|
|
|
|
|
|
while (objc_lookup_class ((char *) class->super_class))
|
|
|
|
|
{
|
|
|
|
|
list_remove_head (&unresolved_classes);
|
|
|
|
|
if (unresolved_classes)
|
|
|
|
|
class = unresolved_classes->head;
|
|
|
|
|
else
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* If we still have classes for whom we don't have yet their
|
|
|
|
|
super classes known to the runtime we don't send the +load
|
|
|
|
|
messages. */
|
|
|
|
|
if (unresolved_classes)
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Special check to allow creating and sending messages to constant
|
|
|
|
|
strings in +load methods. If these classes are not yet known,
|
|
|
|
|
even if all the other classes are known, delay sending of +load. */
|
|
|
|
|
if (! objc_lookup_class (CONSTANT_STRING_CLASS) ||
|
|
|
|
|
! objc_lookup_class (ROOT_OBJECT_CLASS_NAME))
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* 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)
|
|
|
|
|
{
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
|
objc_preorder_traverse (__objc_class_tree_list->head,
|
|
|
|
|
0, __objc_tree_print);
|
|
|
|
|
#endif
|
|
|
|
|
objc_preorder_traverse (__objc_class_tree_list->head,
|
|
|
|
|
0, __objc_send_load);
|
|
|
|
|
objc_postorder_traverse (__objc_class_tree_list->head,
|
|
|
|
|
0, __objc_destroy_class_tree_node);
|
|
|
|
|
list_remove_head (&__objc_class_tree_list);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
list_mapcar (__objc_module_list, (void (*) (void *)) __objc_call_callback);
|
|
|
|
|
list_free (__objc_module_list);
|
|
|
|
|
__objc_module_list = NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void __objc_compute_ivar_offsets(Class class);
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
__objc_create_classes_tree (Module_t module)
|
|
|
|
|
{
|
|
|
|
|
/* The runtime mutex is locked in this point */
|
|
|
|
|
|
|
|
|
|
Symtab_t symtab = module->symtab;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
/* 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];
|
|
|
|
|
|
|
|
|
|
objc_tree_insert_class (class);
|
|
|
|
|
__objc_compute_ivar_offsets (class);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
__objc_call_callback (Module_t module)
|
|
|
|
|
{
|
|
|
|
|
/* 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. */
|
|
|
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
|
|
|
|
{
|
|
|
|
|
Class class = (Class) symtab->defs[i];
|
|
|
|
|
|
|
|
|
|
/* Call the _objc_load_callback for this class. */
|
|
|
|
|
if (_objc_load_callback)
|
|
|
|
|
_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. */
|
|
|
|
|
for (i = 0; i < symtab->cat_def_cnt; i++)
|
|
|
|
|
{
|
|
|
|
|
Category_t category = symtab->defs[i + symtab->cls_def_cnt];
|
|
|
|
|
Class class = objc_lookup_class (category->class_name);
|
|
|
|
|
|
|
|
|
|
if (_objc_load_callback)
|
|
|
|
|
_objc_load_callback (class, category);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Sanity check the version of gcc used to compile `module'. */
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
@ -846,8 +333,7 @@ init_check_module_version (Module_t module)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
struct objc_protocol *__objc_unique_protocol(struct objc_protocol*);
|
|
|
|
|
static void
|
|
|
|
|
__objc_init_protocols (struct objc_protocol_list *protos)
|
|
|
|
|
void __objc_init_protocols (struct objc_protocol_list *protos)
|
|
|
|
|
{
|
|
|
|
|
size_t i;
|
|
|
|
|
static Class proto_class = 0;
|
|
|
|
|
|
theraven
16 years ago