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jlechner |
/* GNU Objective C Runtime initialization
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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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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2, or (at your option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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GCC; see the file COPYING. If not, write to the Free Software
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Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* As a special exception, if you link this library with files compiled with
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GCC to produce an executable, this does not cause the resulting executable
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to be covered by the GNU General Public License. This exception does not
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however invalidate any other reasons why the executable file might be
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covered by the GNU General Public License. */
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#include "objc/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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#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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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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static struct objc_list *unclaimed_proto_list = 0; /* !T:MUTEX */
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/* List of unresolved static instances. */
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static struct objc_list *uninitialized_statics = 0; /* !T:MUTEX */
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/* Global runtime "write" mutex. */
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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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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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/* 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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extern SEL
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__sel_register_typed_name (const char *name, const char *types,
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struct objc_selector *orig, BOOL is_const);
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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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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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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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288 |
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else
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list_node = list_node->tail;
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}
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291 |
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/* If the list was finished but the class hasn't been inserted,
|
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insert it here. */
|
294 |
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if (! list_node)
|
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{
|
296 |
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__objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
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297 |
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__objc_class_tree_list->head = __objc_tree_insert_class (NULL, class);
|
298 |
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}
|
299 |
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}
|
300 |
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|
301 |
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/* Traverse tree in preorder. Used to send +load. */
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302 |
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|
303 |
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static void
|
304 |
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objc_preorder_traverse (objc_class_tree *tree,
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305 |
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int level,
|
306 |
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void (*function) (objc_class_tree *, int))
|
307 |
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{
|
308 |
|
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struct objc_list *node;
|
309 |
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|
310 |
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(*function) (tree, level);
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for (node = tree->subclasses; node; node = node->tail)
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312 |
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objc_preorder_traverse (node->head, level + 1, function);
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313 |
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}
|
314 |
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|
315 |
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/* Traverse tree in postorder. Used to destroy a tree. */
|
316 |
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|
317 |
|
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static void
|
318 |
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objc_postorder_traverse (objc_class_tree *tree,
|
319 |
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int level,
|
320 |
|
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void (*function) (objc_class_tree *, int))
|
321 |
|
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{
|
322 |
|
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struct objc_list *node;
|
323 |
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|
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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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}
|
328 |
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|
329 |
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/* Used to print a tree class hierarchy. */
|
330 |
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|
331 |
|
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#ifdef DEBUG
|
332 |
|
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static void
|
333 |
|
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__objc_tree_print (objc_class_tree *tree, int level)
|
334 |
|
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{
|
335 |
|
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int i;
|
336 |
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|
337 |
|
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for (i = 0; i < level; i++)
|
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printf (" ");
|
339 |
|
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printf ("%s\n", tree->class->name);
|
340 |
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}
|
341 |
|
|
#endif
|
342 |
|
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|
343 |
|
|
/* Walks on a linked list of methods in the reverse order and executes
|
344 |
|
|
all the methods corresponding to `op' selector. Walking in the
|
345 |
|
|
reverse order assures the +load of class is executed first and then
|
346 |
|
|
+load of categories because of the way in which categories are
|
347 |
|
|
added to the class methods. */
|
348 |
|
|
|
349 |
|
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static void
|
350 |
|
|
__objc_send_message_in_list (MethodList_t method_list, Class class, SEL op)
|
351 |
|
|
{
|
352 |
|
|
int i;
|
353 |
|
|
|
354 |
|
|
if (! method_list)
|
355 |
|
|
return;
|
356 |
|
|
|
357 |
|
|
/* First execute the `op' message in the following method lists */
|
358 |
|
|
__objc_send_message_in_list (method_list->method_next, class, op);
|
359 |
|
|
|
360 |
|
|
/* Search the method list. */
|
361 |
|
|
for (i = 0; i < method_list->method_count; i++)
|
362 |
|
|
{
|
363 |
|
|
Method_t mth = &method_list->method_list[i];
|
364 |
|
|
|
365 |
|
|
if (mth->method_name && sel_eq (mth->method_name, op)
|
366 |
|
|
&& ! objc_hash_is_key_in_hash (__objc_load_methods, mth->method_imp))
|
367 |
|
|
{
|
368 |
|
|
/* Add this method into the +load hash table */
|
369 |
|
|
objc_hash_add (&__objc_load_methods,
|
370 |
|
|
mth->method_imp,
|
371 |
|
|
mth->method_imp);
|
372 |
|
|
|
373 |
|
|
DEBUG_PRINTF ("sending +load in class: %s\n", class->name);
|
374 |
|
|
|
375 |
|
|
/* The method was found and wasn't previously executed. */
|
376 |
|
|
(*mth->method_imp) ((id)class, mth->method_name);
|
377 |
|
|
|
378 |
|
|
break;
|
379 |
|
|
}
|
380 |
|
|
}
|
381 |
|
|
}
|
382 |
|
|
|
383 |
|
|
static void
|
384 |
|
|
__objc_send_load (objc_class_tree *tree,
|
385 |
|
|
int level __attribute__ ((__unused__)))
|
386 |
|
|
{
|
387 |
|
|
static SEL load_sel = 0;
|
388 |
|
|
Class class = tree->class;
|
389 |
|
|
MethodList_t method_list = class->class_pointer->methods;
|
390 |
|
|
|
391 |
|
|
if (! load_sel)
|
392 |
|
|
load_sel = sel_register_name ("load");
|
393 |
|
|
|
394 |
|
|
__objc_send_message_in_list (method_list, class, load_sel);
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
static void
|
398 |
|
|
__objc_destroy_class_tree_node (objc_class_tree *tree,
|
399 |
|
|
int level __attribute__ ((__unused__)))
|
400 |
|
|
{
|
401 |
|
|
objc_free (tree);
|
402 |
|
|
}
|
403 |
|
|
|
404 |
|
|
/* This is used to check if the relationship between two classes
|
405 |
|
|
before the runtime completely installs the classes. */
|
406 |
|
|
|
407 |
|
|
static BOOL
|
408 |
|
|
class_is_subclass_of_class (Class class, Class superclass)
|
409 |
|
|
{
|
410 |
|
|
for (; class != Nil;)
|
411 |
|
|
{
|
412 |
|
|
if (class == superclass)
|
413 |
|
|
return YES;
|
414 |
|
|
class = class_superclass_of_class (class);
|
415 |
|
|
}
|
416 |
|
|
|
417 |
|
|
return NO;
|
418 |
|
|
}
|
419 |
|
|
|
420 |
|
|
/* This list contains all the classes in the runtime system for whom
|
421 |
|
|
their superclasses are not yet known to the runtime. */
|
422 |
|
|
static struct objc_list *unresolved_classes = 0;
|
423 |
|
|
|
424 |
|
|
/* Extern function used to reference the Object and NXConstantString
|
425 |
|
|
classes. */
|
426 |
|
|
|
427 |
|
|
extern void __objc_force_linking (void);
|
428 |
|
|
|
429 |
|
|
void
|
430 |
|
|
__objc_force_linking (void)
|
431 |
|
|
{
|
432 |
|
|
extern void __objc_linking (void);
|
433 |
|
|
__objc_linking ();
|
434 |
|
|
}
|
435 |
|
|
|
436 |
|
|
/* Run through the statics list, removing modules as soon as all its
|
437 |
|
|
statics have been initialized. */
|
438 |
|
|
|
439 |
|
|
static void
|
440 |
|
|
objc_init_statics (void)
|
441 |
|
|
{
|
442 |
|
|
struct objc_list **cell = &uninitialized_statics;
|
443 |
|
|
struct objc_static_instances **statics_in_module;
|
444 |
|
|
|
445 |
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
446 |
|
|
|
447 |
|
|
while (*cell)
|
448 |
|
|
{
|
449 |
|
|
int module_initialized = 1;
|
450 |
|
|
|
451 |
|
|
for (statics_in_module = (*cell)->head;
|
452 |
|
|
*statics_in_module; statics_in_module++)
|
453 |
|
|
{
|
454 |
|
|
struct objc_static_instances *statics = *statics_in_module;
|
455 |
|
|
Class class = objc_lookup_class (statics->class_name);
|
456 |
|
|
|
457 |
|
|
if (! class)
|
458 |
|
|
module_initialized = 0;
|
459 |
|
|
/* Actually, the static's class_pointer will be NULL when we
|
460 |
|
|
haven't been here before. However, the comparison is to be
|
461 |
|
|
reminded of taking into account class posing and to think about
|
462 |
|
|
possible semantics... */
|
463 |
|
|
else if (class != statics->instances[0]->class_pointer)
|
464 |
|
|
{
|
465 |
|
|
id *inst;
|
466 |
|
|
|
467 |
|
|
for (inst = &statics->instances[0]; *inst; inst++)
|
468 |
|
|
{
|
469 |
|
|
(*inst)->class_pointer = class;
|
470 |
|
|
|
471 |
|
|
/* ??? Make sure the object will not be freed. With
|
472 |
|
|
refcounting, invoke `-retain'. Without refcounting, do
|
473 |
|
|
nothing and hope that `-free' will never be invoked. */
|
474 |
|
|
|
475 |
|
|
/* ??? Send the object an `-initStatic' or something to
|
476 |
|
|
that effect now or later on? What are the semantics of
|
477 |
|
|
statically allocated instances, besides the trivial
|
478 |
|
|
NXConstantString, anyway? */
|
479 |
|
|
}
|
480 |
|
|
}
|
481 |
|
|
}
|
482 |
|
|
if (module_initialized)
|
483 |
|
|
{
|
484 |
|
|
/* Remove this module from the uninitialized list. */
|
485 |
|
|
struct objc_list *this = *cell;
|
486 |
|
|
*cell = this->tail;
|
487 |
|
|
objc_free (this);
|
488 |
|
|
}
|
489 |
|
|
else
|
490 |
|
|
cell = &(*cell)->tail;
|
491 |
|
|
}
|
492 |
|
|
|
493 |
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
494 |
|
|
} /* objc_init_statics */
|
495 |
|
|
|
496 |
|
|
/* This function is called by constructor functions generated for each
|
497 |
|
|
module compiled. (_GLOBAL_$I$...) The purpose of this function is
|
498 |
|
|
to gather the module pointers so that they may be processed by the
|
499 |
|
|
initialization routines as soon as possible. */
|
500 |
|
|
|
501 |
|
|
void
|
502 |
|
|
__objc_exec_class (Module_t module)
|
503 |
|
|
{
|
504 |
|
|
/* Have we processed any constructors previously? This flag is used to
|
505 |
|
|
indicate that some global data structures need to be built. */
|
506 |
|
|
static BOOL previous_constructors = 0;
|
507 |
|
|
|
508 |
|
|
static struct objc_list *unclaimed_categories = 0;
|
509 |
|
|
|
510 |
|
|
/* The symbol table (defined in objc-api.h) generated by gcc */
|
511 |
|
|
Symtab_t symtab = module->symtab;
|
512 |
|
|
|
513 |
|
|
/* The statics in this module */
|
514 |
|
|
struct objc_static_instances **statics
|
515 |
|
|
= symtab->defs[symtab->cls_def_cnt + symtab->cat_def_cnt];
|
516 |
|
|
|
517 |
|
|
/* Entry used to traverse hash lists */
|
518 |
|
|
struct objc_list **cell;
|
519 |
|
|
|
520 |
|
|
/* The table of selector references for this module */
|
521 |
|
|
SEL selectors = symtab->refs;
|
522 |
|
|
|
523 |
|
|
/* dummy counter */
|
524 |
|
|
int i;
|
525 |
|
|
|
526 |
|
|
DEBUG_PRINTF ("received module: %s\n", module->name);
|
527 |
|
|
|
528 |
|
|
/* check gcc version */
|
529 |
|
|
init_check_module_version (module);
|
530 |
|
|
|
531 |
|
|
/* On the first call of this routine, initialize some data structures. */
|
532 |
|
|
if (! previous_constructors)
|
533 |
|
|
{
|
534 |
|
|
/* Initialize thread-safe system */
|
535 |
|
|
__objc_init_thread_system ();
|
536 |
|
|
__objc_runtime_threads_alive = 1;
|
537 |
|
|
__objc_runtime_mutex = objc_mutex_allocate ();
|
538 |
|
|
|
539 |
|
|
__objc_init_selector_tables ();
|
540 |
|
|
__objc_init_class_tables ();
|
541 |
|
|
__objc_init_dispatch_tables ();
|
542 |
|
|
__objc_class_tree_list = list_cons (NULL, __objc_class_tree_list);
|
543 |
|
|
__objc_load_methods = objc_hash_new (128,
|
544 |
|
|
(hash_func_type)objc_hash_ptr,
|
545 |
|
|
objc_compare_ptrs);
|
546 |
|
|
previous_constructors = 1;
|
547 |
|
|
}
|
548 |
|
|
|
549 |
|
|
/* Save the module pointer for later processing. (not currently used) */
|
550 |
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
551 |
|
|
__objc_module_list = list_cons (module, __objc_module_list);
|
552 |
|
|
|
553 |
|
|
/* Replace referenced selectors from names to SEL's. */
|
554 |
|
|
if (selectors)
|
555 |
|
|
{
|
556 |
|
|
for (i = 0; selectors[i].sel_id; ++i)
|
557 |
|
|
{
|
558 |
|
|
const char *name, *type;
|
559 |
|
|
name = (char *) selectors[i].sel_id;
|
560 |
|
|
type = (char *) selectors[i].sel_types;
|
561 |
|
|
/* Constructors are constant static data so we can safely store
|
562 |
|
|
pointers to them in the runtime structures. is_const == YES */
|
563 |
|
|
__sel_register_typed_name (name, type,
|
564 |
|
|
(struct objc_selector *) &(selectors[i]),
|
565 |
|
|
YES);
|
566 |
|
|
}
|
567 |
|
|
}
|
568 |
|
|
|
569 |
|
|
/* Parse the classes in the load module and gather selector information. */
|
570 |
|
|
DEBUG_PRINTF ("gathering selectors from module: %s\n", module->name);
|
571 |
|
|
for (i = 0; i < symtab->cls_def_cnt; ++i)
|
572 |
|
|
{
|
573 |
|
|
Class class = (Class) symtab->defs[i];
|
574 |
|
|
const char *superclass = (char *) class->super_class;
|
575 |
|
|
|
576 |
|
|
/* Make sure we have what we think. */
|
577 |
|
|
assert (CLS_ISCLASS (class));
|
578 |
|
|
assert (CLS_ISMETA (class->class_pointer));
|
579 |
|
|
DEBUG_PRINTF ("phase 1, processing class: %s\n", class->name);
|
580 |
|
|
|
581 |
|
|
/* Initialize the subclass list to be NULL.
|
582 |
|
|
In some cases it isn't and this crashes the program. */
|
583 |
|
|
class->subclass_list = NULL;
|
584 |
|
|
|
585 |
|
|
/* Store the class in the class table and assign class numbers. */
|
586 |
|
|
__objc_add_class_to_hash (class);
|
587 |
|
|
|
588 |
|
|
/* Register all of the selectors in the class and meta class. */
|
589 |
|
|
__objc_register_selectors_from_class (class);
|
590 |
|
|
__objc_register_selectors_from_class ((Class) class->class_pointer);
|
591 |
|
|
|
592 |
|
|
/* Install the fake dispatch tables */
|
593 |
|
|
__objc_install_premature_dtable (class);
|
594 |
|
|
__objc_install_premature_dtable (class->class_pointer);
|
595 |
|
|
|
596 |
|
|
/* Register the instance methods as class methods, this is
|
597 |
|
|
only done for root classes. */
|
598 |
|
|
__objc_register_instance_methods_to_class (class);
|
599 |
|
|
|
600 |
|
|
if (class->protocols)
|
601 |
|
|
__objc_init_protocols (class->protocols);
|
602 |
|
|
|
603 |
|
|
/* Check to see if the superclass is known in this point. If it's not
|
604 |
|
|
add the class to the unresolved_classes list. */
|
605 |
|
|
if (superclass && ! objc_lookup_class (superclass))
|
606 |
|
|
unresolved_classes = list_cons (class, unresolved_classes);
|
607 |
|
|
}
|
608 |
|
|
|
609 |
|
|
/* Process category information from the module. */
|
610 |
|
|
for (i = 0; i < symtab->cat_def_cnt; ++i)
|
611 |
|
|
{
|
612 |
|
|
Category_t category = symtab->defs[i + symtab->cls_def_cnt];
|
613 |
|
|
Class class = objc_lookup_class (category->class_name);
|
614 |
|
|
|
615 |
|
|
/* If the class for the category exists then append its methods. */
|
616 |
|
|
if (class)
|
617 |
|
|
{
|
618 |
|
|
|
619 |
|
|
DEBUG_PRINTF ("processing categories from (module,object): %s, %s\n",
|
620 |
|
|
module->name,
|
621 |
|
|
class->name);
|
622 |
|
|
|
623 |
|
|
/* Do instance methods. */
|
624 |
|
|
if (category->instance_methods)
|
625 |
|
|
class_add_method_list (class, category->instance_methods);
|
626 |
|
|
|
627 |
|
|
/* Do class methods. */
|
628 |
|
|
if (category->class_methods)
|
629 |
|
|
class_add_method_list ((Class) class->class_pointer,
|
630 |
|
|
category->class_methods);
|
631 |
|
|
|
632 |
|
|
if (category->protocols)
|
633 |
|
|
{
|
634 |
|
|
__objc_init_protocols (category->protocols);
|
635 |
|
|
__objc_class_add_protocols (class, category->protocols);
|
636 |
|
|
}
|
637 |
|
|
|
638 |
|
|
/* Register the instance methods as class methods, this is
|
639 |
|
|
only done for root classes. */
|
640 |
|
|
__objc_register_instance_methods_to_class (class);
|
641 |
|
|
}
|
642 |
|
|
else
|
643 |
|
|
{
|
644 |
|
|
/* The object to which the category methods belong can't be found.
|
645 |
|
|
Save the information. */
|
646 |
|
|
unclaimed_categories = list_cons (category, unclaimed_categories);
|
647 |
|
|
}
|
648 |
|
|
}
|
649 |
|
|
|
650 |
|
|
if (statics)
|
651 |
|
|
uninitialized_statics = list_cons (statics, uninitialized_statics);
|
652 |
|
|
if (uninitialized_statics)
|
653 |
|
|
objc_init_statics ();
|
654 |
|
|
|
655 |
|
|
/* Scan the unclaimed category hash. Attempt to attach any unclaimed
|
656 |
|
|
categories to objects. */
|
657 |
|
|
for (cell = &unclaimed_categories; *cell; )
|
658 |
|
|
{
|
659 |
|
|
Category_t category = (*cell)->head;
|
660 |
|
|
Class class = objc_lookup_class (category->class_name);
|
661 |
|
|
|
662 |
|
|
if (class)
|
663 |
|
|
{
|
664 |
|
|
DEBUG_PRINTF ("attaching stored categories to object: %s\n",
|
665 |
|
|
class->name);
|
666 |
|
|
|
667 |
|
|
list_remove_head (cell);
|
668 |
|
|
|
669 |
|
|
if (category->instance_methods)
|
670 |
|
|
class_add_method_list (class, category->instance_methods);
|
671 |
|
|
|
672 |
|
|
if (category->class_methods)
|
673 |
|
|
class_add_method_list ((Class) class->class_pointer,
|
674 |
|
|
category->class_methods);
|
675 |
|
|
|
676 |
|
|
if (category->protocols)
|
677 |
|
|
{
|
678 |
|
|
__objc_init_protocols (category->protocols);
|
679 |
|
|
__objc_class_add_protocols (class, category->protocols);
|
680 |
|
|
}
|
681 |
|
|
|
682 |
|
|
/* Register the instance methods as class methods, this is
|
683 |
|
|
only done for root classes. */
|
684 |
|
|
__objc_register_instance_methods_to_class (class);
|
685 |
|
|
}
|
686 |
|
|
else
|
687 |
|
|
cell = &(*cell)->tail;
|
688 |
|
|
}
|
689 |
|
|
|
690 |
|
|
if (unclaimed_proto_list && objc_lookup_class ("Protocol"))
|
691 |
|
|
{
|
692 |
|
|
list_mapcar (unclaimed_proto_list,
|
693 |
|
|
(void (*) (void *))__objc_init_protocols);
|
694 |
|
|
list_free (unclaimed_proto_list);
|
695 |
|
|
unclaimed_proto_list = 0;
|
696 |
|
|
}
|
697 |
|
|
|
698 |
|
|
objc_send_load ();
|
699 |
|
|
|
700 |
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
701 |
|
|
}
|
702 |
|
|
|
703 |
|
|
static void
|
704 |
|
|
objc_send_load (void)
|
705 |
|
|
{
|
706 |
|
|
if (! __objc_module_list)
|
707 |
|
|
return;
|
708 |
|
|
|
709 |
|
|
/* Try to find out if all the classes loaded so far also have their
|
710 |
|
|
superclasses known to the runtime. We suppose that the objects
|
711 |
|
|
that are allocated in the +load method are in general of a class
|
712 |
|
|
declared in the same module. */
|
713 |
|
|
if (unresolved_classes)
|
714 |
|
|
{
|
715 |
|
|
Class class = unresolved_classes->head;
|
716 |
|
|
|
717 |
|
|
while (objc_lookup_class ((char *) class->super_class))
|
718 |
|
|
{
|
719 |
|
|
list_remove_head (&unresolved_classes);
|
720 |
|
|
if (unresolved_classes)
|
721 |
|
|
class = unresolved_classes->head;
|
722 |
|
|
else
|
723 |
|
|
break;
|
724 |
|
|
}
|
725 |
|
|
|
726 |
|
|
/* If we still have classes for whom we don't have yet their
|
727 |
|
|
super classes known to the runtime we don't send the +load
|
728 |
|
|
messages. */
|
729 |
|
|
if (unresolved_classes)
|
730 |
|
|
return;
|
731 |
|
|
}
|
732 |
|
|
|
733 |
|
|
/* Special check to allow creating and sending messages to constant
|
734 |
|
|
strings in +load methods. If these classes are not yet known,
|
735 |
|
|
even if all the other classes are known, delay sending of +load. */
|
736 |
|
|
if (! objc_lookup_class ("NXConstantString") ||
|
737 |
|
|
! objc_lookup_class ("Object"))
|
738 |
|
|
return;
|
739 |
|
|
|
740 |
|
|
/* Iterate over all modules in the __objc_module_list and call on
|
741 |
|
|
them the __objc_create_classes_tree function. This function
|
742 |
|
|
creates a tree of classes that resembles the class hierarchy. */
|
743 |
|
|
list_mapcar (__objc_module_list,
|
744 |
|
|
(void (*) (void *)) __objc_create_classes_tree);
|
745 |
|
|
|
746 |
|
|
while (__objc_class_tree_list)
|
747 |
|
|
{
|
748 |
|
|
#ifdef DEBUG
|
749 |
|
|
objc_preorder_traverse (__objc_class_tree_list->head,
|
750 |
|
|
0, __objc_tree_print);
|
751 |
|
|
#endif
|
752 |
|
|
objc_preorder_traverse (__objc_class_tree_list->head,
|
753 |
|
|
0, __objc_send_load);
|
754 |
|
|
objc_postorder_traverse (__objc_class_tree_list->head,
|
755 |
|
|
0, __objc_destroy_class_tree_node);
|
756 |
|
|
list_remove_head (&__objc_class_tree_list);
|
757 |
|
|
}
|
758 |
|
|
|
759 |
|
|
list_mapcar (__objc_module_list, (void (*) (void *)) __objc_call_callback);
|
760 |
|
|
list_free (__objc_module_list);
|
761 |
|
|
__objc_module_list = NULL;
|
762 |
|
|
}
|
763 |
|
|
|
764 |
|
|
static void
|
765 |
|
|
__objc_create_classes_tree (Module_t module)
|
766 |
|
|
{
|
767 |
|
|
/* The runtime mutex is locked in this point */
|
768 |
|
|
|
769 |
|
|
Symtab_t symtab = module->symtab;
|
770 |
|
|
int i;
|
771 |
|
|
|
772 |
|
|
/* Iterate thru classes defined in this module and insert them in
|
773 |
|
|
the classes tree hierarchy. */
|
774 |
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
775 |
|
|
{
|
776 |
|
|
Class class = (Class) symtab->defs[i];
|
777 |
|
|
|
778 |
|
|
objc_tree_insert_class (class);
|
779 |
|
|
}
|
780 |
|
|
}
|
781 |
|
|
|
782 |
|
|
static void
|
783 |
|
|
__objc_call_callback (Module_t module)
|
784 |
|
|
{
|
785 |
|
|
/* The runtime mutex is locked in this point. */
|
786 |
|
|
|
787 |
|
|
Symtab_t symtab = module->symtab;
|
788 |
|
|
int i;
|
789 |
|
|
|
790 |
|
|
/* Iterate thru classes defined in this module and call the callback
|
791 |
|
|
for each one. */
|
792 |
|
|
for (i = 0; i < symtab->cls_def_cnt; i++)
|
793 |
|
|
{
|
794 |
|
|
Class class = (Class) symtab->defs[i];
|
795 |
|
|
|
796 |
|
|
/* Call the _objc_load_callback for this class. */
|
797 |
|
|
if (_objc_load_callback)
|
798 |
|
|
_objc_load_callback (class, 0);
|
799 |
|
|
}
|
800 |
|
|
|
801 |
|
|
/* Call the _objc_load_callback for categories. Don't register the
|
802 |
|
|
instance methods as class methods for categories to root classes
|
803 |
|
|
since they were already added in the class. */
|
804 |
|
|
for (i = 0; i < symtab->cat_def_cnt; i++)
|
805 |
|
|
{
|
806 |
|
|
Category_t category = symtab->defs[i + symtab->cls_def_cnt];
|
807 |
|
|
Class class = objc_lookup_class (category->class_name);
|
808 |
|
|
|
809 |
|
|
if (_objc_load_callback)
|
810 |
|
|
_objc_load_callback (class, category);
|
811 |
|
|
}
|
812 |
|
|
}
|
813 |
|
|
|
814 |
|
|
/* Sanity check the version of gcc used to compile `module'. */
|
815 |
|
|
|
816 |
|
|
static void
|
817 |
|
|
init_check_module_version (Module_t module)
|
818 |
|
|
{
|
819 |
|
|
if ((module->version != OBJC_VERSION) || (module->size != sizeof (Module)))
|
820 |
|
|
{
|
821 |
|
|
int code;
|
822 |
|
|
|
823 |
|
|
if (module->version > OBJC_VERSION)
|
824 |
|
|
code = OBJC_ERR_OBJC_VERSION;
|
825 |
|
|
else if (module->version < OBJC_VERSION)
|
826 |
|
|
code = OBJC_ERR_GCC_VERSION;
|
827 |
|
|
else
|
828 |
|
|
code = OBJC_ERR_MODULE_SIZE;
|
829 |
|
|
|
830 |
|
|
objc_error (nil, code, "Module %s version %d doesn't match runtime %d\n",
|
831 |
|
|
module->name, (int)module->version, OBJC_VERSION);
|
832 |
|
|
}
|
833 |
|
|
}
|
834 |
|
|
|
835 |
|
|
static void
|
836 |
|
|
__objc_init_protocols (struct objc_protocol_list *protos)
|
837 |
|
|
{
|
838 |
|
|
size_t i;
|
839 |
|
|
static Class proto_class = 0;
|
840 |
|
|
|
841 |
|
|
if (! protos)
|
842 |
|
|
return;
|
843 |
|
|
|
844 |
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
845 |
|
|
|
846 |
|
|
if (! proto_class)
|
847 |
|
|
proto_class = objc_lookup_class ("Protocol");
|
848 |
|
|
|
849 |
|
|
if (! proto_class)
|
850 |
|
|
{
|
851 |
|
|
unclaimed_proto_list = list_cons (protos, unclaimed_proto_list);
|
852 |
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
853 |
|
|
return;
|
854 |
|
|
}
|
855 |
|
|
|
856 |
|
|
#if 0
|
857 |
|
|
assert (protos->next == 0); /* only single ones allowed */
|
858 |
|
|
#endif
|
859 |
|
|
|
860 |
|
|
for (i = 0; i < protos->count; i++)
|
861 |
|
|
{
|
862 |
|
|
struct objc_protocol *aProto = protos->list[i];
|
863 |
|
|
if (((size_t)aProto->class_pointer) == PROTOCOL_VERSION)
|
864 |
|
|
{
|
865 |
|
|
/* assign class pointer */
|
866 |
|
|
aProto->class_pointer = proto_class;
|
867 |
|
|
|
868 |
|
|
/* init super protocols */
|
869 |
|
|
__objc_init_protocols (aProto->protocol_list);
|
870 |
|
|
}
|
871 |
|
|
else if (protos->list[i]->class_pointer != proto_class)
|
872 |
|
|
{
|
873 |
|
|
objc_error (nil, OBJC_ERR_PROTOCOL_VERSION,
|
874 |
|
|
"Version %d doesn't match runtime protocol version %d\n",
|
875 |
|
|
(int) ((char *) protos->list[i]->class_pointer
|
876 |
|
|
- (char *) 0),
|
877 |
|
|
PROTOCOL_VERSION);
|
878 |
|
|
}
|
879 |
|
|
}
|
880 |
|
|
|
881 |
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
882 |
|
|
}
|
883 |
|
|
|
884 |
|
|
static void
|
885 |
|
|
__objc_class_add_protocols (Class class, struct objc_protocol_list *protos)
|
886 |
|
|
{
|
887 |
|
|
/* Well... */
|
888 |
|
|
if (! protos)
|
889 |
|
|
return;
|
890 |
|
|
|
891 |
|
|
/* Add it... */
|
892 |
|
|
protos->next = class->protocols;
|
893 |
|
|
class->protocols = protos;
|
894 |
|
|
}
|