/* GNU Objective C Runtime selector related functions   Copyright (C) 1993-2026 Free Software Foundation, Inc.   Contributed by Kresten Krab Thorup This file is part of GCC. GCC 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 3, or (at your option) any later version. GCC 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. Under Section 7 of GPL version 3, you are granted additionalpermissions described in the GCC Runtime Library Exception, version3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License anda copy of the GCC Runtime Library Exception along with this program;see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see<http://www.gnu.org/licenses/>.  */ #include "objc-private/common.h"#include "objc/runtime.h"#include "objc/thr.h"#include "objc-private/hash.h"#include "objc-private/objc-list.h"#include "objc-private/module-abi-8.h"#include "objc-private/runtime.h"#include "objc-private/sarray.h"#include "objc-private/selector.h"#include <stdlib.h>                    /* For malloc.  */ /* Initial selector hash table size. Value doesn't matter much.  */#define SELECTOR_HASH_SIZE 128 /* Tables mapping selector names to uid and opposite.  */static struct sarray *__objc_selector_array = 0; /* uid -> sel  !T:MUTEX */static struct sarray *__objc_selector_names = 0; /* uid -> name !T:MUTEX */static cache_ptr      __objc_selector_hash  = 0; /* name -> uid !T:MUTEX */ /* Number of selectors stored in each of the above tables.  */unsigned int __objc_selector_max_index = 0;     /* !T:MUTEX */ /* Forward-declare an internal function.  */static SEL__sel_register_typed_name (const char *name, const char *types,			   struct objc_selector *orig, BOOL is_const); void __objc_init_selector_tables (void){  __objc_selector_array = sarray_new (SELECTOR_HASH_SIZE, 0);  __objc_selector_names = sarray_new (SELECTOR_HASH_SIZE, 0);  __objc_selector_hash    = objc_hash_new (SELECTOR_HASH_SIZE,		     (hash_func_type) objc_hash_string,		     (compare_func_type) objc_compare_strings);}   /* Register a bunch of selectors from the table of selectors in a   module.  'selectors' should not be NULL.  The list is terminated by   a selectors with a NULL sel_id.  The selectors are assumed to   contain the 'name' in the sel_id field; this is replaced with the   final selector id after they are registered.  */void__objc_register_selectors_from_module (struct objc_selector *selectors){  int i;   for (i = 0; selectors[i].sel_id; ++i)    {      const char *name, *type;      name = (char *) selectors[i].sel_id;      type = (char *) selectors[i].sel_types;      /* Constructors are constant static data and we can safely store	 pointers to them in the runtime structures, so we set	 is_const == YES.  */      __sel_register_typed_name (name, type, (struct objc_selector *) &(selectors[i]),				 /* is_const */ YES);    }} /* This routine is given a class and records all of the methods in its   class structure in the record table.  */void__objc_register_selectors_from_class (Class class){  struct objc_method_list * method_list;   method_list = class->methods;  while (method_list)    {      __objc_register_selectors_from_list (method_list);      method_list = method_list->method_next;    }}  /* This routine is given a list of methods and records each of the   methods in the record table.  This is the routine that does the   actual recording work.    The name and type pointers in the method list must be permanent and   immutable.  */void__objc_register_selectors_from_list (struct objc_method_list *method_list){  int i = 0;   objc_mutex_lock (__objc_runtime_mutex);  while (i < method_list->method_count)    {      Method method = &method_list->method_list[i];      if (method->method_name)	{	  method->method_name	    = __sel_register_typed_name ((const char *) method->method_name,					 method->method_types, 0, YES);	}      i += 1;    }  objc_mutex_unlock (__objc_runtime_mutex);} /* The same as __objc_register_selectors_from_list, but works on a   struct objc_method_description_list* instead of a struct   objc_method_list*.  This is only used for protocols, which have   lists of method descriptions, not methods.  */void__objc_register_selectors_from_description_list (struct objc_method_description_list *method_list){  int i = 0;    objc_mutex_lock (__objc_runtime_mutex);  while (i < method_list->count)    {      struct objc_method_description *method = &method_list->list[i];      if (method->name)	{	  method->name	    = __sel_register_typed_name ((const char *) method->name,					 method->types, 0, YES);	}      i += 1;    }  objc_mutex_unlock (__objc_runtime_mutex);} /* Register instance methods as class methods for root classes.  */void __objc_register_instance_methods_to_class (Class class){  struct objc_method_list *method_list;  struct objc_method_list *class_method_list;  int max_methods_no = 16;  struct objc_method_list *new_list;  Method curr_method;   /* Only if a root class. */  if (class->super_class)    return;   /* Allocate a method list to hold the new class methods.  */  new_list = objc_calloc (sizeof (struct objc_method_list)			  + sizeof (struct objc_method[max_methods_no]), 1);  method_list = class->methods;  class_method_list = class->class_pointer->methods;  curr_method = &new_list->method_list[0];    /* Iterate through the method lists for the class.  */  while (method_list)    {      int i;            /* Iterate through the methods from this method list.  */      for (i = 0; i < method_list->method_count; i++)	{	  Method mth = &method_list->method_list[i];	  if (mth->method_name	      && ! search_for_method_in_list (class_method_list,					      mth->method_name))	    {	      /* This instance method isn't a class method.  Add it		 into the new_list. */	      *curr_method = *mth;	      	      /* Reallocate the method list if necessary.  */	      if (++new_list->method_count == max_methods_no)		new_list =		  objc_realloc (new_list, sizeof (struct objc_method_list)				+ sizeof (struct 					  objc_method[max_methods_no += 16]));	      curr_method = &new_list->method_list[new_list->method_count];	    }	}       method_list = method_list->method_next;    }   /* If we created any new class methods then attach the method list     to the class.  */  if (new_list->method_count)    {      new_list = 	objc_realloc (new_list, sizeof (struct objc_method_list)		      + sizeof (struct objc_method[new_list->method_count]));      new_list->method_next = class->class_pointer->methods;      class->class_pointer->methods = new_list;    }  else    objc_free(new_list);    __objc_update_dispatch_table_for_class (class->class_pointer);} BOOLsel_isEqual (SEL s1, SEL s2){  if (s1 == 0 || s2 == 0)    return s1 == s2;  else    return s1->sel_id == s2->sel_id;} /* Return YES iff t1 and t2 have same method types.  Ignore the   argframe layout.  */static BOOLsel_types_match (const char *t1, const char *t2){  if (! t1 || ! t2)    return NO;  while (*t1 && *t2)    {      if (*t1 == '+') t1++;      if (*t2 == '+') t2++;      while (isdigit ((unsigned char) *t1)) t1++;      while (isdigit ((unsigned char) *t2)) t2++;      /* xxx Remove these next two lines when qualifiers are put in	 all selectors, not just Protocol selectors.  */      t1 = objc_skip_type_qualifiers (t1);      t2 = objc_skip_type_qualifiers (t2);      if (! *t1 && ! *t2)	return YES;      if (*t1 != *t2)	return NO;      t1++;      t2++;    }  return NO;} /* Return selector representing name.  */SELsel_get_any_uid (const char *name){  struct objc_list *l;  sidx i;   objc_mutex_lock (__objc_runtime_mutex);   i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);  if (soffset_decode (i) == 0)    {      objc_mutex_unlock (__objc_runtime_mutex);      return 0;    }   l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);  objc_mutex_unlock (__objc_runtime_mutex);   if (l == 0)    return 0;   return (SEL) l->head;} SELsel_getTypedSelector (const char *name){  sidx i;   if (name == NULL)    return NULL;    objc_mutex_lock (__objc_runtime_mutex);    /* Look for a typed selector.  */  i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);  if (i != 0)    {      struct objc_list *l;      SEL returnValue = NULL;       for (l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);	   l; l = l->tail)	{	  SEL s = (SEL) l->head;	  if (s->sel_types)	    {	      if (returnValue == NULL)		{		  /* First typed selector that we find.  Keep it in		     returnValue, but keep checking as we want to		     detect conflicts.  */		  returnValue = s;		}	      else		{		  /* We had already found a typed selectors, so we		     have multiple ones.  Double-check that they have		     different types, just in case for some reason we		     got duplicates with the same types.  If so, it's		     OK, we'll ignore the duplicate.  */		  if (returnValue->sel_types == s->sel_types)		    continue;		  else if (sel_types_match (returnValue->sel_types, s->sel_types))		    continue;		  else		    {		      /* The types of the two selectors are different;			 it's a conflict.  Too bad.  Return NULL.  */		      objc_mutex_unlock (__objc_runtime_mutex);		      return NULL;		    }		}	    }	}       if (returnValue != NULL)	{	  objc_mutex_unlock (__objc_runtime_mutex);	  return returnValue;	}    }   /* No typed selector found.  Return NULL.  */  objc_mutex_unlock (__objc_runtime_mutex);  return 0;} SEL *sel_copyTypedSelectorList (const char *name, unsigned int *numberOfReturnedSelectors){  unsigned int count = 0;  SEL *returnValue = NULL;  sidx i;    if (name == NULL)    {      if (numberOfReturnedSelectors)	*numberOfReturnedSelectors = 0;      return NULL;    }   objc_mutex_lock (__objc_runtime_mutex);   /* Count how many selectors we have.  */  i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);  if (i != 0)    {      struct objc_list *selector_list = NULL;      selector_list = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);       /* Count how many selectors we have.  */      {	struct objc_list *l;	for (l = selector_list; l; l = l->tail)	  count++;      }       if (count != 0)	{	  /* Allocate enough memory to hold them.  */	  returnValue = (SEL *)(malloc (sizeof (SEL) * (count + 1)));	  	  /* Copy the selectors.  */	  {	    unsigned int j;	    for (j = 0; j < count; j++)	      {		returnValue[j] = (SEL)(selector_list->head);		selector_list = selector_list->tail;	      }	    returnValue[j] = NULL;	  }	}    }         objc_mutex_unlock (__objc_runtime_mutex);    if (numberOfReturnedSelectors)    *numberOfReturnedSelectors = count;    return returnValue;} /* Get the name of a selector.  If the selector is unknown, the empty   string "" is returned.  */ const char *sel_getName (SEL selector){  const char *ret;   if (selector == NULL)    return "<null selector>";    objc_mutex_lock (__objc_runtime_mutex);  if ((soffset_decode ((sidx)selector->sel_id) > 0)      && (soffset_decode ((sidx)selector->sel_id) <= __objc_selector_max_index))    ret = sarray_get_safe (__objc_selector_names, (sidx) selector->sel_id);  else    ret = 0;  objc_mutex_unlock (__objc_runtime_mutex);  return ret;} BOOLsel_is_mapped (SEL selector){  unsigned int idx = soffset_decode ((sidx)selector->sel_id);  return ((idx > 0) && (idx <= __objc_selector_max_index));} const char *sel_getTypeEncoding (SEL selector){  if (selector)    return selector->sel_types;  else    return 0;} /* The uninstalled dispatch table.  */extern struct sarray *__objc_uninstalled_dtable; /* __sel_register_typed_name allocates lots of struct objc_selector:s   of 8 (16, if pointers are 64 bits) bytes at startup. To reduce the   number of malloc calls and memory lost to malloc overhead, we   allocate objc_selector:s in blocks here. This is only called from   __sel_register_typed_name, and __sel_register_typed_name may only   be called when __objc_runtime_mutex is locked.    Note that the objc_selector:s allocated from   __sel_register_typed_name are never freed.    62 because 62 * sizeof (struct objc_selector) = 496 (992). This   should let malloc add some overhead and use a nice, round 512   (1024) byte chunk.  */#define SELECTOR_POOL_SIZE 62static struct objc_selector *selector_pool;static int selector_pool_left; static struct objc_selector *pool_alloc_selector(void){  if (!selector_pool_left)    {      selector_pool = objc_malloc (sizeof (struct objc_selector)				   * SELECTOR_POOL_SIZE);      selector_pool_left = SELECTOR_POOL_SIZE;    }  return &selector_pool[--selector_pool_left];} /* Store the passed selector name in the selector record and return   its selector value (value returned by sel_get_uid).  Assume that   the calling function has locked down __objc_runtime_mutex.  The   'is_const' parameter tells us if the name and types parameters are   really constant or not.  If YES then they are constant and we can   just store the pointers.  If NO then we need to copy name and types   because the pointers may disappear later on.  If the 'orig'   parameter is not NULL, then we are registering a selector from a   module, and 'orig' is that selector.  In this case, we can put the   selector in the tables if needed, and orig->sel_id is updated with   the selector ID of the registered selector, and 'orig' is   returned.  */static SEL__sel_register_typed_name (const char *name, const char *types, 			   struct objc_selector *orig, BOOL is_const){  struct objc_selector *j;  sidx i;  struct objc_list *l;   i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);  if (soffset_decode (i) != 0)    {      /* There are already selectors with that name.  Examine them to	 see if the one we're registering already exists.  */      for (l = (struct objc_list *)sarray_get_safe (__objc_selector_array, i);	   l; l = l->tail)	{	  SEL s = (SEL)l->head;	  if (types == 0 || s->sel_types == 0)	    {	      if (s->sel_types == types)		{		  if (orig)		    {		      orig->sel_id = (void *)i;

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