1043 lines
34 KiB
C
1043 lines
34 KiB
C
/* GNU Objective C Runtime initialization
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Copyright (C) 1993-2022 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 3, 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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Uncommented the following line to enable debug logging. Use this
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only while debugging the runtime. */
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/* #define DEBUG 1 */
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#include "objc-private/common.h"
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#include "objc-private/error.h"
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#include "objc/runtime.h"
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#include "objc/thr.h"
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#include "objc-private/hash.h"
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#include "objc-private/objc-list.h"
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#include "objc-private/module-abi-8.h"
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#include "objc-private/runtime.h" /* For __objc_resolve_class_links(). */
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#include "objc-private/selector.h" /* For __sel_register_typed_name(). */
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#include "objc-private/objc-sync.h" /* For __objc_sync_init() */
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#include "objc-private/protocols.h" /* For __objc_protocols_init(),
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__objc_protocols_add_protocol()
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__objc_protocols_register_selectors() */
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#include "objc-private/accessors.h" /* For __objc_accessors_init() */
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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 modules currently loaded into the runtime and
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for which the +load method (and the load callback, if any) has not
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been called yet. */
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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
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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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/* List of duplicated classes found while loading modules. If we find
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a class twice, we ignore it the second time. On some platforms,
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where the order in which modules are loaded is well defined, this
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allows you to replace a class in a shared library by linking in a
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new implementation which is loaded in in the right order, and which
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overrides the existing one.
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Protected by __objc_runtime_mutex. */
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static cache_ptr duplicate_classes = NULL;
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/* Global runtime "write" mutex. Having a single mutex prevents
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deadlocks, but reduces concurrency. To improve concurrency, some
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groups of functions in the runtime have their own separate mutex
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(eg, __class_table_lock in class.c); to avoid deadlocks, these
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routines must make sure that they never acquire any other lock
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while holding their own local lock. Ie, they should lock, execute
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some C code that does not perform any calls to other runtime
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functions which may potentially lock different locks, then unlock.
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If they need to perform any calls to other runtime functions that
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may potentially lock other locks, then they should use the global
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__objc_runtime_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 (struct objc_module *);
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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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/* Assign isa link to a protocol, and register it. */
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static void __objc_init_protocol (struct objc_protocol *protocol);
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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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/* Load callback hook. */
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void (*_objc_load_callback) (Class class, struct objc_category *category) = 0; /* !T:SAFE */
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/* Are all categories/classes resolved ? */
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BOOL __objc_dangling_categories = NO; /* !T:UNUSED */
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/* Sends +load to all classes and categories in certain
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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 (struct objc_module *module);
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/* Calls the _objc_load_callback for each class and category in the
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module (if _objc_load_callback is not NULL). */
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static void __objc_call_load_callback (struct objc_module *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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/* This is a node in the class tree hierarchy used to send +load
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messages. */
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typedef struct objc_class_tree
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{
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/* The class corresponding to the node. */
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Class class;
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/* This is a linked list of all the direct subclasses of this class.
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'head' points to a subclass node; 'tail' points to the next
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objc_list node (whose 'head' points to another subclass node,
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etc). */
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struct objc_list *subclasses;
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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 may 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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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_getClass (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 `bottom_class'.
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If `upper' is Nil, creates a class hierarchy up to a root class.
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The classes in this tree are super classes of `bottom_class'. The
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`subclasses' member of each tree node point to the list of
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subclasses for the 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;
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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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superclass = class_superclass_of_class (bottom_class);
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prev = objc_calloc (1, sizeof (objc_class_tree));
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prev->class = bottom_class;
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if (superclass == upper)
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return prev;
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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
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is 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 = %p (root: %s), class = %s\n",
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tree, ((tree && tree->class) ? tree->class->name : "Nil"), 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
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to the list of subclasses. First check to see if it wasn't
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already 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
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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
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for 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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/* Try to insert the class in this class hierarchy. */
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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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return;
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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, we
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don't have an existing class hierarchy that can accommodate it.
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Create a new one. */
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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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/* 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 the `+load' selector. Walking in
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the reverse order assures the +load of class is executed first and
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then +load of categories because of the way in which categories are
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added to the class methods. This function needs to be called with
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the objc_runtime_mutex locked. */
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static void
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__objc_send_load_using_method_list (struct objc_method_list *method_list, Class class)
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{
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static SEL load_selector = 0;
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int i;
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if (!method_list)
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return;
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/* This needs no lock protection because we are called with the
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objc_runtime_mutex locked. */
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if (!load_selector)
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load_selector = sel_registerName ("load");
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/* method_list is a linked list of method lists; since we're
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executing in reverse order, we need to do the next list before we
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do this one. */
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__objc_send_load_using_method_list (method_list->method_next, class);
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/* Search the method list. */
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for (i = 0; i < method_list->method_count; i++)
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{
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struct objc_method *mth = &method_list->method_list[i];
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/* We are searching for +load methods that we haven't executed
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yet. */
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if (mth->method_name && sel_eq (mth->method_name, load_selector)
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&& ! objc_hash_is_key_in_hash (__objc_load_methods, mth->method_imp))
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{
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/* Add this method into the +load hash table, so we won't
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execute it again next time. */
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objc_hash_add (&__objc_load_methods,
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mth->method_imp,
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mth->method_imp);
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/* Call +load. */
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DEBUG_PRINTF (" begin of [%s +load]\n", class->name);
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(*mth->method_imp) ((id)class, mth->method_name);
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DEBUG_PRINTF (" end of [%s +load]\n", class->name);
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break;
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}
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}
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}
|
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|
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/* This function needs to be called with the objc_runtime_mutex
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locked. */
|
|
static void
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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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Class class = tree->class;
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struct objc_method_list *method_list = class->class_pointer->methods;
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DEBUG_PRINTF ("+load: need to send load to class '%s'\n", class->name);
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__objc_send_load_using_method_list (method_list, class);
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}
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|
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static void
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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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|
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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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for (; class != Nil;)
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{
|
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if (class == superclass)
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return YES;
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class = class_superclass_of_class (class);
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}
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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 superclasses are not yet known to the runtime. */
|
|
static struct objc_list *unresolved_classes = 0;
|
|
|
|
/* Extern function used to reference the Object class. */
|
|
extern void __objc_force_linking (void);
|
|
|
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void
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__objc_force_linking (void)
|
|
{
|
|
extern void __objc_linking (void);
|
|
__objc_linking ();
|
|
}
|
|
|
|
/* Run through the statics list, removing modules as soon as all its
|
|
statics have been initialized. */
|
|
static void
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objc_init_statics (void)
|
|
{
|
|
struct objc_list **cell = &uninitialized_statics;
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|
struct objc_static_instances **statics_in_module;
|
|
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
|
|
|
while (*cell)
|
|
{
|
|
int module_initialized = 1;
|
|
|
|
for (statics_in_module = (*cell)->head;
|
|
*statics_in_module; statics_in_module++)
|
|
{
|
|
struct objc_static_instances *statics = *statics_in_module;
|
|
Class class = objc_getClass (statics->class_name);
|
|
|
|
if (! class)
|
|
{
|
|
/* It is unfortunate that this will cause all the
|
|
statics initialization to be done again (eg, if we
|
|
already initialized constant strings, and are now
|
|
initializing protocols, setting module_initialized to
|
|
0 would cause constant strings to be initialized
|
|
again). It would be good to be able to track if we
|
|
have already initialized some of them. */
|
|
module_initialized = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Note that if this is a list of Protocol objects, some
|
|
of them may have been initialized already (because
|
|
they were attached to classes or categories, and the
|
|
class/category loading code automatically fixes them
|
|
up), and some of them may not. We really need to go
|
|
through the whole list to be sure! Protocols are
|
|
also special because we want to register them and
|
|
register all their selectors. */
|
|
id *inst;
|
|
|
|
if (strcmp (statics->class_name, "Protocol") == 0)
|
|
{
|
|
/* Protocols are special, because not only we want
|
|
to fix up their class pointers, but we also want
|
|
to register them and their selectors with the
|
|
runtime. */
|
|
for (inst = &statics->instances[0]; *inst; inst++)
|
|
__objc_init_protocol ((struct objc_protocol *)*inst);
|
|
}
|
|
else
|
|
{
|
|
/* Other static instances (typically constant
|
|
strings) are easier as we just fix up their class
|
|
pointers. */
|
|
for (inst = &statics->instances[0]; *inst; inst++)
|
|
(*inst)->class_pointer = class;
|
|
}
|
|
}
|
|
}
|
|
if (module_initialized)
|
|
{
|
|
/* Remove this module from the uninitialized list. */
|
|
struct objc_list *this = *cell;
|
|
*cell = this->tail;
|
|
objc_free (this);
|
|
}
|
|
else
|
|
cell = &(*cell)->tail;
|
|
}
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
}
|
|
|
|
/* This function is called by constructor functions generated for each
|
|
module compiled. (_GLOBAL_$I$...) The purpose of this function is
|
|
to gather the module pointers so that they may be processed by the
|
|
initialization routines as soon as possible. */
|
|
void
|
|
__objc_exec_class (struct objc_module *module)
|
|
{
|
|
/* Have we processed any constructors previously? This flag is used
|
|
to indicate that some global data structures need to be
|
|
built. */
|
|
static BOOL previous_constructors = 0;
|
|
|
|
static struct objc_list *unclaimed_categories = 0;
|
|
|
|
/* The symbol table (defined in objc-private/module-abi-8.h)
|
|
generated by gcc. */
|
|
struct objc_symtab *symtab = module->symtab;
|
|
|
|
/* The statics in this module. */
|
|
struct objc_static_instances **statics
|
|
= symtab->defs[symtab->cls_def_cnt + symtab->cat_def_cnt];
|
|
|
|
/* Entry used to traverse hash lists. */
|
|
struct objc_list **cell;
|
|
|
|
/* The table of selector references for this module. */
|
|
struct objc_selector *selectors = symtab->refs;
|
|
|
|
int i;
|
|
|
|
DEBUG_PRINTF ("\n__objc_exec_class (%p) - start processing module...\n", module);
|
|
|
|
/* Check gcc version. */
|
|
init_check_module_version (module);
|
|
|
|
/* On the first call of this routine, initialize some data
|
|
structures. */
|
|
if (! previous_constructors)
|
|
{
|
|
/* Initialize thread-safe system. */
|
|
__objc_init_thread_system ();
|
|
__objc_runtime_threads_alive = 1;
|
|
__objc_runtime_mutex = objc_mutex_allocate ();
|
|
|
|
__objc_init_selector_tables ();
|
|
__objc_init_class_tables ();
|
|
__objc_init_dispatch_tables ();
|
|
duplicate_classes = objc_hash_new (8,
|
|
(hash_func_type)objc_hash_ptr,
|
|
objc_compare_ptrs);
|
|
__objc_load_methods = objc_hash_new (128,
|
|
(hash_func_type)objc_hash_ptr,
|
|
objc_compare_ptrs);
|
|
__objc_protocols_init ();
|
|
__objc_accessors_init ();
|
|
__objc_sync_init ();
|
|
previous_constructors = 1;
|
|
}
|
|
|
|
/* Save the module pointer so that later we remember to call +load
|
|
on all classes and categories on it. */
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
|
__objc_module_list = list_cons (module, __objc_module_list);
|
|
|
|
/* Replace referenced selectors from names to SELs. */
|
|
if (selectors)
|
|
{
|
|
DEBUG_PRINTF (" registering selectors\n");
|
|
__objc_register_selectors_from_module (selectors);
|
|
}
|
|
|
|
/* Parse the classes in the load module and gather selector
|
|
information. */
|
|
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 (" 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;
|
|
|
|
if (__objc_init_class (class))
|
|
{
|
|
/* 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_getClass (superclass))
|
|
unresolved_classes = list_cons (class, unresolved_classes);
|
|
}
|
|
}
|
|
|
|
/* Process category information from the module. */
|
|
for (i = 0; i < symtab->cat_def_cnt; ++i)
|
|
{
|
|
struct objc_category *category = symtab->defs[i + symtab->cls_def_cnt];
|
|
Class class = objc_getClass (category->class_name);
|
|
|
|
/* If the class for the category exists then append its
|
|
methods. */
|
|
if (class)
|
|
{
|
|
DEBUG_PRINTF (" installing category '%s (%s)'\n", category->class_name, category->category_name);
|
|
/* Do instance methods. */
|
|
if (category->instance_methods)
|
|
class_add_method_list (class, category->instance_methods);
|
|
|
|
/* Do class methods. */
|
|
if (category->class_methods)
|
|
class_add_method_list ((Class) class->class_pointer,
|
|
category->class_methods);
|
|
|
|
if (category->protocols)
|
|
{
|
|
__objc_init_protocols (category->protocols);
|
|
__objc_class_add_protocols (class, category->protocols);
|
|
}
|
|
|
|
/* Register the instance methods as class methods, this is
|
|
only done for root classes. */
|
|
__objc_register_instance_methods_to_class (class);
|
|
}
|
|
else
|
|
{
|
|
DEBUG_PRINTF (" delaying installation of category '%s (%s)'\n", category->class_name, category->category_name);
|
|
/* The object to which the category methods belong can't be
|
|
found. Save the information. */
|
|
unclaimed_categories = list_cons (category, unclaimed_categories);
|
|
}
|
|
}
|
|
|
|
if (statics)
|
|
uninitialized_statics = list_cons (statics, uninitialized_statics);
|
|
if (uninitialized_statics)
|
|
objc_init_statics ();
|
|
|
|
/* Scan the unclaimed category hash. Attempt to attach any
|
|
unclaimed categories to objects. */
|
|
for (cell = &unclaimed_categories; *cell; )
|
|
{
|
|
struct objc_category *category = (*cell)->head;
|
|
Class class = objc_getClass (category->class_name);
|
|
|
|
if (class)
|
|
{
|
|
DEBUG_PRINTF (" installing (delayed) category '%s (%s)'\n", category->class_name, category->category_name);
|
|
list_remove_head (cell);
|
|
|
|
if (category->instance_methods)
|
|
class_add_method_list (class, category->instance_methods);
|
|
|
|
if (category->class_methods)
|
|
class_add_method_list ((Class) class->class_pointer,
|
|
category->class_methods);
|
|
|
|
if (category->protocols)
|
|
{
|
|
__objc_init_protocols (category->protocols);
|
|
__objc_class_add_protocols (class, category->protocols);
|
|
}
|
|
|
|
/* Register the instance methods as class methods, this is
|
|
only done for root classes. */
|
|
__objc_register_instance_methods_to_class (class);
|
|
}
|
|
else
|
|
cell = &(*cell)->tail;
|
|
}
|
|
|
|
if (unclaimed_proto_list && objc_getClass ("Protocol"))
|
|
{
|
|
list_mapcar (unclaimed_proto_list,
|
|
(void (*) (void *))__objc_init_protocols);
|
|
list_free (unclaimed_proto_list);
|
|
unclaimed_proto_list = 0;
|
|
}
|
|
|
|
objc_send_load ();
|
|
|
|
/* Check if there are no unresolved classes (ie, classes whose
|
|
superclass has not been loaded yet) and that the 'Object' class,
|
|
used as the class of classes, exist. If so, it is worth
|
|
"resolving the class links" at this point, which will setup all
|
|
the class/superclass pointers. */
|
|
if (!unresolved_classes && objc_getClass ("Object"))
|
|
{
|
|
DEBUG_PRINTF (" resolving class links\n");
|
|
__objc_resolve_class_links ();
|
|
}
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
|
|
DEBUG_PRINTF ("__objc_exec_class (%p) - finished processing module...\n\n", module);
|
|
}
|
|
|
|
/* This function needs to be called with the objc_runtime_mutex
|
|
locked. */
|
|
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_getClass ((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 (and call the load callback) yet. */
|
|
if (unresolved_classes)
|
|
return;
|
|
}
|
|
|
|
/* Special check. If 'Object', which is used by meta-classes, has
|
|
not been loaded yet, delay sending of +load. */
|
|
if (! objc_getClass ("Object"))
|
|
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);
|
|
}
|
|
|
|
/* For each module, call the _objc_load_callback if any is
|
|
defined. */
|
|
list_mapcar (__objc_module_list, (void (*) (void *)) __objc_call_load_callback);
|
|
|
|
/* Empty the list of modules. */
|
|
list_free (__objc_module_list);
|
|
__objc_module_list = NULL;
|
|
}
|
|
|
|
static void
|
|
__objc_create_classes_tree (struct objc_module *module)
|
|
{
|
|
/* The runtime mutex is locked at this point */
|
|
struct objc_symtab *symtab = module->symtab;
|
|
int i;
|
|
|
|
/* Iterate through 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];
|
|
|
|
if (!objc_hash_is_key_in_hash (duplicate_classes, class))
|
|
objc_tree_insert_class (class);
|
|
}
|
|
|
|
/* Now iterate over "claimed" categories too (ie, categories that
|
|
extend a class that has already been loaded by the runtime), and
|
|
insert them in the classes tree hiearchy too. Otherwise, if you
|
|
add a category, its +load method would not be called if the class
|
|
is already loaded in the runtime. It the category is
|
|
"unclaimed", ie, we haven't loaded the main class yet, postpone
|
|
sending +load as we want to execute +load from the class before
|
|
we execute the one from the category. */
|
|
for (i = 0; i < symtab->cat_def_cnt; ++i)
|
|
{
|
|
struct objc_category *category = symtab->defs[i + symtab->cls_def_cnt];
|
|
Class class = objc_getClass (category->class_name);
|
|
|
|
/* If the class for the category exists then append its
|
|
methods. */
|
|
if (class)
|
|
objc_tree_insert_class (class);
|
|
}
|
|
}
|
|
|
|
static void
|
|
__objc_call_load_callback (struct objc_module *module)
|
|
{
|
|
if (_objc_load_callback)
|
|
{
|
|
/* The runtime mutex is locked at this point. */
|
|
struct objc_symtab *symtab = module->symtab;
|
|
int i;
|
|
|
|
/* Iterate through 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];
|
|
|
|
if (!objc_hash_is_key_in_hash (duplicate_classes, class))
|
|
{
|
|
/* Call the _objc_load_callback for this class. */
|
|
DEBUG_PRINTF (" calling the load callback for class '%s'\n", class->name);
|
|
_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++)
|
|
{
|
|
struct objc_category *category = symtab->defs[i + symtab->cls_def_cnt];
|
|
Class class = objc_getClass (category->class_name);
|
|
|
|
DEBUG_PRINTF (" calling the load callback for category '%s (%s)'\n",
|
|
category->class_name, category->category_name);
|
|
_objc_load_callback (class, category);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Sanity check the version of gcc used to compile `module'. */
|
|
static void
|
|
init_check_module_version (struct objc_module *module)
|
|
{
|
|
if ((module->version != OBJC_VERSION) || (module->size != sizeof (struct objc_module)))
|
|
{
|
|
_objc_abort ("Module %s version %d doesn't match runtime %d\n",
|
|
module->name, (int)module->version, OBJC_VERSION);
|
|
}
|
|
}
|
|
|
|
/* __objc_init_class must be called with __objc_runtime_mutex already
|
|
locked. Return YES if the class could be setup; return NO if the
|
|
class could not be setup because a class with the same name already
|
|
exists. */
|
|
BOOL
|
|
__objc_init_class (Class class)
|
|
{
|
|
/* Store the class in the class table and assign class numbers. */
|
|
if (__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. */
|
|
__objc_install_premature_dtable (class);
|
|
__objc_install_premature_dtable (class->class_pointer);
|
|
|
|
/* 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);
|
|
|
|
return YES;
|
|
}
|
|
else
|
|
{
|
|
/* The module contains a duplicate class. Remember it so that
|
|
we will ignore it later. */
|
|
DEBUG_PRINTF (" duplicate class '%s' - will be ignored\n", class->name);
|
|
objc_hash_add (&duplicate_classes, class, class);
|
|
return NO;
|
|
}
|
|
}
|
|
|
|
/* __objc_init_protocol must be called with __objc_runtime_mutex
|
|
already locked, and the "Protocol" class already registered. */
|
|
static void
|
|
__objc_init_protocol (struct objc_protocol *protocol)
|
|
{
|
|
static Class proto_class = 0;
|
|
|
|
if (! proto_class)
|
|
proto_class = objc_getClass ("Protocol");
|
|
|
|
if (((size_t)protocol->class_pointer) == PROTOCOL_VERSION)
|
|
{
|
|
/* Assign class pointer. */
|
|
protocol->class_pointer = proto_class;
|
|
|
|
/* Register all the selectors in the protocol with the runtime.
|
|
This both registers the selectors with the right types, and
|
|
it also fixes up the 'struct objc_method' structures inside
|
|
the protocol so that each method_name (a char * as compiled
|
|
by the compiler) is replaced with the appropriate runtime
|
|
SEL. */
|
|
if (protocol->class_methods)
|
|
__objc_register_selectors_from_description_list (protocol->class_methods);
|
|
|
|
if (protocol->instance_methods)
|
|
__objc_register_selectors_from_description_list (protocol->instance_methods);
|
|
|
|
/* Register the protocol in the hashtable or protocols by
|
|
name. */
|
|
__objc_protocols_add_protocol (protocol->protocol_name, protocol);
|
|
|
|
/* Init super protocols. */
|
|
__objc_init_protocols (protocol->protocol_list);
|
|
}
|
|
else if (protocol->class_pointer != proto_class)
|
|
{
|
|
_objc_abort ("Version %d doesn't match runtime protocol version %d\n",
|
|
(int) ((char *) protocol->class_pointer
|
|
- (char *) 0),
|
|
PROTOCOL_VERSION);
|
|
}
|
|
}
|
|
|
|
static void
|
|
__objc_init_protocols (struct objc_protocol_list *protos)
|
|
{
|
|
size_t i;
|
|
static Class proto_class = 0;
|
|
|
|
if (! protos)
|
|
return;
|
|
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
|
|
|
if (! proto_class)
|
|
proto_class = objc_getClass ("Protocol");
|
|
|
|
if (! proto_class)
|
|
{
|
|
unclaimed_proto_list = list_cons (protos, unclaimed_proto_list);
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
return;
|
|
}
|
|
|
|
#if 0
|
|
assert (protos->next == 0); /* Only single ones allowed. */
|
|
#endif
|
|
|
|
for (i = 0; i < protos->count; i++)
|
|
{
|
|
struct objc_protocol *aProto = protos->list[i];
|
|
__objc_init_protocol (aProto);
|
|
}
|
|
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
|
}
|
|
|
|
static void
|
|
__objc_class_add_protocols (Class class, struct objc_protocol_list *protos)
|
|
{
|
|
if (! protos)
|
|
return;
|
|
|
|
protos->next = class->protocols;
|
|
class->protocols = protos;
|
|
}
|