364 lines
11 KiB
C
364 lines
11 KiB
C
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/* GNU Objective C Runtime initialization
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Copyright (C) 1993, 1995 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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This file is part of GNU CC.
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GNU CC 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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GNU CC 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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GNU CC; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "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 7
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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;
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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;
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/* List of unresolved static instances. */
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static struct objc_list *uninitialized_statics;
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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 class
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or a category is loaded into the runtime. This may e.g. help a
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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) = 0;
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/* Is all categories/classes resolved? */
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BOOL __objc_dangling_categories = NO;
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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);
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/* Run through the statics list, removing modules as soon as all its statics
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have been initialized. */
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static void
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objc_init_statics ()
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{
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struct objc_list **cell = &uninitialized_statics;
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struct objc_static_instances **statics_in_module;
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while (*cell)
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{
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int module_initialized = 1;
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for (statics_in_module = (*cell)->head;
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*statics_in_module; statics_in_module++)
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{
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struct objc_static_instances *statics = *statics_in_module;
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Class class = objc_lookup_class (statics->class_name);
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if (!class)
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module_initialized = 0;
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/* Actually, the static's class_pointer will be NULL when we
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haven't been here before. However, the comparison is to be
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reminded of taking into account class posing and to think about
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possible semantics... */
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else if (class != statics->instances[0]->class_pointer)
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{
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id *inst;
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for (inst = &statics->instances[0]; *inst; inst++)
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{
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(*inst)->class_pointer = class;
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/* ??? Make sure the object will not be freed. With
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refcounting, invoke `-retain'. Without refcounting, do
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nothing and hope that `-free' will never be invoked. */
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/* ??? Send the object an `-initStatic' or something to
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that effect now or later on? What are the semantics of
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statically allocated instances, besides the trivial
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NXConstantString, anyway? */
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}
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}
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}
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if (module_initialized)
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{
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/* Remove this module from the uninitialized list. */
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struct objc_list *this = *cell;
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*cell = this->tail;
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free (this);
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}
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else
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cell = &(*cell)->tail;
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}
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} /* objc_init_statics */
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/* This function is called by constructor functions generated for each
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module compiled. (_GLOBAL_$I$...) The purpose of this function is to
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gather the module pointers so that they may be processed by the
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initialization routines as soon as possible */
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void
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__objc_exec_class (Module_t module)
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{
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/* Have we processed any constructors previously? This flag is used to
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indicate that some global data structures need to be built. */
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static BOOL previous_constructors = 0;
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static struct objc_list* unclaimed_categories = 0;
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/* The symbol table (defined in objc-api.h) generated by gcc */
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Symtab_t symtab = module->symtab;
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/* Entry used to traverse hash lists */
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struct objc_list** cell;
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/* The table of selector references for this module */
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SEL selectors = symtab->refs;
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/* dummy counter */
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int i;
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DEBUG_PRINTF ("received module: %s\n", module->name);
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/* check gcc version */
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init_check_module_version(module);
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/* On the first call of this routine, initialize some data structures. */
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if (!previous_constructors)
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{
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__objc_init_selector_tables();
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__objc_init_class_tables();
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__objc_init_dispatch_tables();
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previous_constructors = 1;
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}
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/* Save the module pointer for later processing. (not currently used) */
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__objc_module_list = list_cons(module, __objc_module_list);
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/* Replace referenced selectors from names to SEL's. */
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if (selectors)
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{
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for (i = 0; selectors[i].sel_id; ++i)
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{
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const char *name, *type;
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name = (char*)selectors[i].sel_id;
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type = (char*)selectors[i].sel_types;
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__sel_register_typed_name (name, type,
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(struct objc_selector*)&(selectors[i]));
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}
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}
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/* Parse the classes in the load module and gather selector information. */
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DEBUG_PRINTF ("gathering selectors from module: %s\n", module->name);
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for (i = 0; i < symtab->cls_def_cnt; ++i)
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{
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Class class = (Class) symtab->defs[i];
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/* Make sure we have what we think. */
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assert (CLS_ISCLASS(class));
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assert (CLS_ISMETA(class->class_pointer));
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DEBUG_PRINTF ("phase 1, processing class: %s\n", class->name);
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/* Store the class in the class table and assign class numbers. */
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__objc_add_class_to_hash (class);
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/* Register all of the selectors in the class and meta class. */
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__objc_register_selectors_from_class (class);
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__objc_register_selectors_from_class ((Class) class->class_pointer);
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/* Install the fake dispatch tables */
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__objc_install_premature_dtable(class);
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__objc_install_premature_dtable(class->class_pointer);
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if (class->protocols)
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__objc_init_protocols (class->protocols);
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if (_objc_load_callback)
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_objc_load_callback(class, 0);
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}
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/* Process category information from the module. */
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for (i = 0; i < symtab->cat_def_cnt; ++i)
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{
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Category_t category = symtab->defs[i + symtab->cls_def_cnt];
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Class class = objc_lookup_class (category->class_name);
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/* If the class for the category exists then append its methods. */
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if (class)
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{
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DEBUG_PRINTF ("processing categories from (module,object): %s, %s\n",
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module->name,
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class->name);
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/* Do instance methods. */
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if (category->instance_methods)
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class_add_method_list (class, category->instance_methods);
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/* Do class methods. */
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if (category->class_methods)
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class_add_method_list ((Class) class->class_pointer,
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category->class_methods);
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if (category->protocols)
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{
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__objc_init_protocols (category->protocols);
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__objc_class_add_protocols (class, category->protocols);
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}
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if (_objc_load_callback)
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_objc_load_callback(class, category);
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}
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else
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{
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/* The object to which the category methods belong can't be found.
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Save the information. */
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unclaimed_categories = list_cons(category, unclaimed_categories);
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}
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}
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if (module->statics)
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uninitialized_statics = list_cons (module->statics, uninitialized_statics);
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if (uninitialized_statics)
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objc_init_statics ();
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/* Scan the unclaimed category hash. Attempt to attach any unclaimed
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categories to objects. */
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for (cell = &unclaimed_categories;
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*cell;
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({ if (*cell) cell = &(*cell)->tail; }))
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{
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Category_t category = (*cell)->head;
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Class class = objc_lookup_class (category->class_name);
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if (class)
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{
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DEBUG_PRINTF ("attaching stored categories to object: %s\n",
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class->name);
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list_remove_head (cell);
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if (category->instance_methods)
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class_add_method_list (class, category->instance_methods);
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if (category->class_methods)
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class_add_method_list ((Class) class->class_pointer,
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category->class_methods);
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if (category->protocols)
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{
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__objc_init_protocols (category->protocols);
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__objc_class_add_protocols (class, category->protocols);
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}
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if (_objc_load_callback)
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_objc_load_callback(class, category);
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}
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}
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if (unclaimed_proto_list && objc_lookup_class ("Protocol"))
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{
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list_mapcar (unclaimed_proto_list,(void(*)(void*))__objc_init_protocols);
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list_free (unclaimed_proto_list);
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unclaimed_proto_list = 0;
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}
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}
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/* Sanity check the version of gcc used to compile `module'*/
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static void init_check_module_version(Module_t module)
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{
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if ((module->version != OBJC_VERSION) || (module->size != sizeof (Module)))
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{
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fprintf (stderr, "Module %s version %d doesn't match runtime %d\n",
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module->name, (int)module->version, OBJC_VERSION);
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if(module->version > OBJC_VERSION)
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fprintf (stderr, "Runtime (libobjc.a) is out of date\n");
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else if (module->version < OBJC_VERSION)
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fprintf (stderr, "Compiler (gcc) is out of date\n");
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else
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fprintf (stderr, "Objective C internal error -- bad Module size\n");
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abort ();
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}
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}
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static void
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__objc_init_protocols (struct objc_protocol_list* protos)
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{
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int i;
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static Class proto_class = 0;
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if (! protos)
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return;
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if (!proto_class)
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proto_class = objc_lookup_class("Protocol");
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if (!proto_class)
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{
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unclaimed_proto_list = list_cons (protos, unclaimed_proto_list);
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return;
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}
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#if 0
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assert (protos->next == 0); /* only single ones allowed */
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#endif
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for(i = 0; i < protos->count; i++)
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{
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struct objc_protocol* aProto = protos->list[i];
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if (((size_t)aProto->class_pointer) == PROTOCOL_VERSION)
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{
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/* assign class pointer */
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aProto->class_pointer = proto_class;
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/* init super protocols */
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__objc_init_protocols (aProto->protocol_list);
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}
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else if (protos->list[i]->class_pointer != proto_class)
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{
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fprintf (stderr,
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"Version %d doesn't match runtime protocol version %d\n",
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(int)((char*)protos->list[i]->class_pointer-(char*)0),
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PROTOCOL_VERSION);
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abort ();
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}
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}
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}
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static void __objc_class_add_protocols (Class class,
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struct objc_protocol_list* protos)
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{
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/* Well... */
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if (! protos)
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return;
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/* Add it... */
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protos->next = class->protocols;
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class->protocols = protos;
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}
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