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- /* GNU Objective C Runtime initialization
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- Author: Kresten Krab Thorup
-
- This file is part of GNU CC.
-
- GNU CC is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 2, or (at your option) any later version.
-
- GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
- details.
-
- You should have received a copy of the GNU General Public License along with
- GNU CC; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* As a special exception, if you link this library with files compiled with
- GCC to produce an executable, this does not cause the resulting executable
- to be covered by the GNU General Public License. This exception does not
- however invalidate any other reasons why the executable file might be
- covered by the GNU General Public License. */
-
- #include "runtime.h"
-
- /* The version number of this runtime. This must match the number
- defined in gcc (objc-act.c) */
- #define OBJC_VERSION 5
- #define PROTOCOL_VERSION 2
-
- /* This list contains all modules currently loaded into the runtime */
- static struct objc_list* __objc_module_list = 0;
-
- /* This list contains all proto_list's not yet assigned class links */
- static struct objc_list* unclaimed_proto_list = 0;
-
- /* Check compiler vs runtime version */
- static void init_check_module_version(Module_t);
-
- /* Assign isa links to protos */
- static void __objc_init_protocols (struct objc_protocol_list* protos);
-
- /* Add protocol to class */
- static void __objc_class_add_protocols (Class*, struct objc_protocol_list*);
-
- /* Is all categories/classes resolved? */
- BOOL __objc_dangling_categories = NO;
-
- /* 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 (Module_t module)
- {
- /* Has we processed any constructors previously? This flag 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.h) generated by gcc */
- Symtab_t symtab = module->symtab;
-
- /* Entry used to traverse hash lists */
- struct objc_list** cell;
-
- /* The table of selector references for this module */
- SEL *selectors = symtab->refs;
-
- /* dummy counter */
- int i;
-
- DEBUG_PRINTF ("received module: %s\n", module->name);
- /* check gcc version */
- init_check_module_version(module);
-
- /* On the first call of this routine, initialize some data structures. */
- if (!previous_constructors)
- {
- __objc_init_selector_tables();
- __objc_init_class_tables();
- __objc_init_dispatch_tables();
- previous_constructors = 1;
- }
-
- /* Save the module pointer for later processing. (not currently used) */
- __objc_module_list = list_cons(module, __objc_module_list);
-
- /* Parse the classes in the load module and gather selector information. */
- DEBUG_PRINTF ("gathering selectors from module: %s\n", module->name);
- for (i = 0; i < symtab->cls_def_cnt; ++i)
- {
- Class* class = (Class*) symtab->defs[i];
-
- /* Make sure we have what we think. */
- assert (CLS_ISCLASS(class));
- assert (CLS_ISMETA(class->class_pointer));
- DEBUG_PRINTF ("phase 1, processing class: %s\n", class->name);
-
- /* Store the class in the class table and assign class numbers. */
- __objc_add_class_to_hash (class);
-
- /* Register all of the selectors in the class and meta class. */
- __objc_register_selectors_from_class (class);
- __objc_register_selectors_from_class ((Class*) class->class_pointer);
-
- /* Install the fake dispatch tables */
- __objc_install_premature_dtable(class);
- __objc_install_premature_dtable(class->class_pointer);
-
- if (class->protocols)
- __objc_init_protocols (class->protocols);
- }
-
- /* Replace referenced selectors from names to SEL's. */
- if (selectors)
- {
- for (i = 0; selectors[i]; ++i)
- selectors[i] = sel_register_name ((const char *) selectors[i]);
- }
-
- /* Process category information from the module. */
- for (i = 0; i < symtab->cat_def_cnt; ++i)
- {
- Category_t category = symtab->defs[i + symtab->cls_def_cnt];
- Class* class = objc_lookup_class (category->class_name);
-
- /* If the class for the category exists then append its methods. */
- if (class)
- {
-
- DEBUG_PRINTF ("processing categories from (module,object): %s, %s\n",
- module->name,
- class->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);
- }
-
- }
- else
- {
- /* The object to which the category methods belong can't be found.
- Save the information. */
- unclaimed_categories = list_cons(category, unclaimed_categories);
- }
- }
-
- /* Scan the unclaimed category hash. Attempt to attach any unclaimed
- categories to objects. */
- for (cell = &unclaimed_categories;
- *cell;
- *cell && ((cell = &(*cell)->tail)))
- {
- Category_t category = (*cell)->head;
- Class* class = objc_lookup_class (category->class_name);
-
- if (class)
- {
- DEBUG_PRINTF ("attaching stored categories to object: %s\n",
- class->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);
- }
-
- }
- }
-
- if (unclaimed_proto_list && objc_lookup_class ("Protocol"))
- {
- list_mapcar (unclaimed_proto_list,(void(*)(void*))__objc_init_protocols);
- list_free (unclaimed_proto_list);
- unclaimed_proto_list = 0;
- }
-
- }
-
- /* Sanity check the version of gcc used to compile `module'*/
- static void init_check_module_version(Module_t module)
- {
- if ((module->version != OBJC_VERSION) || (module->size != sizeof (Module)))
- {
- fprintf (stderr, "Module %s version %d doesn't match runtime %d\n",
- module->name, module->version, OBJC_VERSION);
- if(module->version > OBJC_VERSION)
- fprintf (stderr, "Runtime (libobjc.a) is out of date\n");
- else if (module->version < OBJC_VERSION)
- fprintf (stderr, "Compiler (gcc) is out of date\n");
- else
- fprintf (stderr, "Objective C internal error -- bad Module size\n");
- abort ();
- }
- }
-
- static void
- __objc_init_protocols (struct objc_protocol_list* protos)
- {
- int i;
- static Class* proto_class = 0;
-
- if (! protos)
- return;
-
- if (!proto_class)
- proto_class = objc_lookup_class("Protocol");
-
- if (!proto_class)
- {
- unclaimed_proto_list = list_cons (protos, unclaimed_proto_list);
- return;
- }
-
- assert (protos->next == 0); /* only single ones allowed */
-
- for(i = 0; i < protos->count; i++)
- {
- struct objc_protocol* aProto = protos->list[i];
- if (((size_t)aProto->class_pointer) == PROTOCOL_VERSION)
- {
- /* assign class pointer */
- aProto->class_pointer = proto_class;
-
- /* init super protocols */
- __objc_init_protocols (aProto->protocol_list);
- }
- else if (protos->list[i]->class_pointer != proto_class)
- {
- fprintf (stderr,
- "Version %d doesn't match runtime protocol version %d\n",
- ((size_t)protos->list[i]->class_pointer),
- PROTOCOL_VERSION);
- abort ();
- }
- }
- }
-
- static void __objc_class_add_protocols (Class* class,
- struct objc_protocol_list* protos)
- {
- /* Well... */
- if (! protos)
- return;
-
- /* Add it... */
- protos->next = class->protocols;
- class->protocols = protos;
- }
-