/* GNU Objective C Runtime initialization    Copyright (C) 1993, 1995 Free Software Foundation, Inc.   Contributed by Kresten Krab ThorupThis file is part of GNU CC.GNU CC is free software; you can redistribute it and/or modify it under theterms of the GNU General Public License as published by the Free SoftwareFoundation; either version 2, or (at your option) any later version.GNU CC is distributed in the hope that it will be useful, but WITHOUT ANYWARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESSFOR A PARTICULAR PURPOSE.  See the GNU General Public License for moredetails.You should have received a copy of the GNU General Public License along withGNU CC; see the file COPYING.  If not, write to the Free SoftwareFoundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 7#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;/* List of unresolved static instances.  */static struct objc_list *uninitialized_statics;/* 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*);/* This is a hook which is called by __objc_exec_class every time a class   or a category is loaded into the runtime.  This may e.g. help a   dynamic loader determine the classes that have been loaded when   an object file is dynamically linked in */void (*_objc_load_callback)(Class class, Category* category) = 0;/* Is all categories/classes resolved? */BOOL __objc_dangling_categories = NO;extern SEL__sel_register_typed_name (const char *name, const char *types, 			   struct objc_selector *orig);/* Run through the statics list, removing modules as soon as all its statics   have been initialized.  */static voidobjc_init_statics (){  struct objc_list **cell = &uninitialized_statics;  struct objc_static_instances **statics_in_module;  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_lookup_class (statics->class_name);	  if (!class)	    module_initialized = 0;	  /* Actually, the static's class_pointer will be NULL when we             haven't been here before.  However, the comparison is to be             reminded of taking into account class posing and to think about             possible semantics...  */	  else if (class != statics->instances[0]->class_pointer)	    {	      id *inst;	      for (inst = &statics->instances[0]; *inst; inst++)		{		  (*inst)->class_pointer = class;		  /* ??? Make sure the object will not be freed.  With                     refcounting, invoke `-retain'.  Without refcounting, do                     nothing and hope that `-free' will never be invoked.  */		  /* ??? Send the object an `-initStatic' or something to                     that effect now or later on?  What are the semantics of                     statically allocated instances, besides the trivial                     NXConstantString, anyway?  */		}	    }	}      if (module_initialized)	{	  /* Remove this module from the uninitialized list.  */	  struct objc_list *this = *cell;	  *cell = this->tail;	  free (this);	}      else	cell = &(*cell)->tail;    }} /* objc_init_statics *//* 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){  /* 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-api.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);  /* Replace referenced selectors from names to SEL's.  */  if (selectors)    {      for (i = 0; selectors[i].sel_id; ++i)	{	  const char *name, *type;	  name = (char*)selectors[i].sel_id;	  type = (char*)selectors[i].sel_types;	  __sel_register_typed_name (name, type, 				     (struct objc_selector*)&(selectors[i]));	}    }  /* 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);      if (_objc_load_callback)	_objc_load_callback(class, 0);   }  /* 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);	    }          if (_objc_load_callback)	    _objc_load_callback(class, category);	}      else	{	  /* The object to which the category methods belong can't be found.	     Save the information.  */	  unclaimed_categories = list_cons(category, unclaimed_categories);	}    }  if (module->statics)    uninitialized_statics = list_cons (module->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;       ({ if (*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 (_objc_load_callback)	    _objc_load_callback(class, category);	}    }    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, (int)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;    }#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];      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",		   (int)((char*)protos->list[i]->class_pointer-(char*)0),		   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;}