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jlechner |
/* GNU Objective C Runtime selector related functions
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Copyright (C) 1993, 1995, 1996, 1997, 2002, 2004 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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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 2, 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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You should have received a copy of the GNU General Public License along with
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GCC; see the file COPYING. If not, write to the Free Software
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Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 "objc/runtime.h"
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#include "objc/sarray.h"
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#include "objc/encoding.h"
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/* Initial selector hash table size. Value doesn't matter much */
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#define SELECTOR_HASH_SIZE 128
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/* Tables mapping selector names to uid and opposite */
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static struct sarray *__objc_selector_array = 0; /* uid -> sel !T:MUTEX */
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static struct sarray *__objc_selector_names = 0; /* uid -> name !T:MUTEX */
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static cache_ptr __objc_selector_hash = 0; /* name -> uid !T:MUTEX */
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/* Number of selectors stored in each of the above tables */
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unsigned int __objc_selector_max_index = 0; /* !T:MUTEX */
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void __objc_init_selector_tables (void)
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{
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__objc_selector_array = sarray_new (SELECTOR_HASH_SIZE, 0);
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__objc_selector_names = sarray_new (SELECTOR_HASH_SIZE, 0);
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__objc_selector_hash
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= objc_hash_new (SELECTOR_HASH_SIZE,
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(hash_func_type) objc_hash_string,
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(compare_func_type) objc_compare_strings);
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}
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/* This routine is given a class and records all of the methods in its class
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structure in the record table. */
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void
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__objc_register_selectors_from_class (Class class)
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{
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MethodList_t method_list;
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method_list = class->methods;
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while (method_list)
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{
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__objc_register_selectors_from_list (method_list);
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method_list = method_list->method_next;
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}
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}
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/* This routine is given a list of methods and records each of the methods in
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the record table. This is the routine that does the actual recording
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work.
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The name and type pointers in the method list must be permanent and
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immutable.
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*/
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void
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__objc_register_selectors_from_list (MethodList_t method_list)
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{
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int i = 0;
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objc_mutex_lock (__objc_runtime_mutex);
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while (i < method_list->method_count)
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{
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Method_t method = &method_list->method_list[i];
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if (method->method_name)
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{
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method->method_name
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= __sel_register_typed_name ((const char *) method->method_name,
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method->method_types, 0, YES);
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}
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i += 1;
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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}
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/* Register instance methods as class methods for root classes */
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void __objc_register_instance_methods_to_class (Class class)
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{
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MethodList_t method_list;
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MethodList_t class_method_list;
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int max_methods_no = 16;
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MethodList_t new_list;
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Method_t curr_method;
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/* Only if a root class. */
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if (class->super_class)
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return;
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/* Allocate a method list to hold the new class methods */
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new_list = objc_calloc (sizeof (struct objc_method_list)
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+ sizeof (struct objc_method[max_methods_no]), 1);
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method_list = class->methods;
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class_method_list = class->class_pointer->methods;
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curr_method = &new_list->method_list[0];
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/* Iterate through the method lists for the class */
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while (method_list)
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{
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int i;
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/* Iterate through the methods from this method list */
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for (i = 0; i < method_list->method_count; i++)
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{
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Method_t mth = &method_list->method_list[i];
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if (mth->method_name
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&& ! search_for_method_in_list (class_method_list,
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mth->method_name))
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{
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/* This instance method isn't a class method.
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Add it into the new_list. */
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*curr_method = *mth;
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/* Reallocate the method list if necessary */
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if (++new_list->method_count == max_methods_no)
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new_list =
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objc_realloc (new_list, sizeof (struct objc_method_list)
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+ sizeof (struct
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objc_method[max_methods_no += 16]));
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curr_method = &new_list->method_list[new_list->method_count];
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}
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}
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method_list = method_list->method_next;
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}
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/* If we created any new class methods
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then attach the method list to the class */
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if (new_list->method_count)
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{
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new_list =
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objc_realloc (new_list, sizeof (struct objc_method_list)
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+ sizeof (struct objc_method[new_list->method_count]));
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new_list->method_next = class->class_pointer->methods;
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class->class_pointer->methods = new_list;
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}
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else
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objc_free(new_list);
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__objc_update_dispatch_table_for_class (class->class_pointer);
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}
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/* Returns YES iff t1 and t2 have same method types, but we ignore
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the argframe layout */
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BOOL
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sel_types_match (const char *t1, const char *t2)
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{
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if (! t1 || ! t2)
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return NO;
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while (*t1 && *t2)
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{
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if (*t1 == '+') t1++;
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if (*t2 == '+') t2++;
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while (isdigit ((unsigned char) *t1)) t1++;
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while (isdigit ((unsigned char) *t2)) t2++;
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/* xxx Remove these next two lines when qualifiers are put in
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all selectors, not just Protocol selectors. */
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t1 = objc_skip_type_qualifiers (t1);
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t2 = objc_skip_type_qualifiers (t2);
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if (! *t1 && ! *t2)
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return YES;
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if (*t1 != *t2)
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return NO;
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t1++;
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t2++;
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}
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return NO;
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}
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/* return selector representing name */
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SEL
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sel_get_typed_uid (const char *name, const char *types)
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{
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struct objc_list *l;
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sidx i;
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objc_mutex_lock (__objc_runtime_mutex);
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i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);
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if (i == 0)
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return 0;
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}
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for (l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);
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l; l = l->tail)
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{
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SEL s = (SEL) l->head;
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if (types == 0 || s->sel_types == 0)
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{
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if (s->sel_types == types)
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return s;
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}
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}
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else if (sel_types_match (s->sel_types, types))
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return s;
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}
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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return 0;
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}
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/* Return selector representing name; prefer a selector with non-NULL type */
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SEL
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sel_get_any_typed_uid (const char *name)
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{
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struct objc_list *l;
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sidx i;
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SEL s = NULL;
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objc_mutex_lock (__objc_runtime_mutex);
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i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);
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if (i == 0)
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return 0;
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}
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for (l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);
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l; l = l->tail)
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{
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s = (SEL) l->head;
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if (s->sel_types)
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return s;
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}
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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return s;
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}
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/* return selector representing name */
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SEL
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sel_get_any_uid (const char *name)
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{
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struct objc_list *l;
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sidx i;
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objc_mutex_lock (__objc_runtime_mutex);
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i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);
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if (soffset_decode (i) == 0)
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return 0;
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}
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l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);
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objc_mutex_unlock (__objc_runtime_mutex);
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if (l == 0)
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return 0;
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return (SEL) l->head;
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}
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/* return selector representing name */
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SEL
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sel_get_uid (const char *name)
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{
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return sel_register_typed_name (name, 0);
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}
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/* Get name of selector. If selector is unknown, the empty string ""
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is returned */
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const char *sel_get_name (SEL selector)
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{
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296 |
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const char *ret;
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297 |
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298 |
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objc_mutex_lock (__objc_runtime_mutex);
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if ((soffset_decode ((sidx)selector->sel_id) > 0)
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&& (soffset_decode ((sidx)selector->sel_id) <= __objc_selector_max_index))
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ret = sarray_get_safe (__objc_selector_names, (sidx) selector->sel_id);
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else
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ret = 0;
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objc_mutex_unlock (__objc_runtime_mutex);
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305 |
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return ret;
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306 |
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}
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307 |
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308 |
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BOOL
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309 |
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sel_is_mapped (SEL selector)
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310 |
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{
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311 |
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unsigned int idx = soffset_decode ((sidx)selector->sel_id);
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312 |
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return ((idx > 0) && (idx <= __objc_selector_max_index));
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313 |
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}
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314 |
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315 |
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316 |
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const char *sel_get_type (SEL selector)
|
317 |
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{
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318 |
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if (selector)
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319 |
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return selector->sel_types;
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320 |
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else
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321 |
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return 0;
|
322 |
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}
|
323 |
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|
324 |
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/* The uninstalled dispatch table */
|
325 |
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extern struct sarray *__objc_uninstalled_dtable;
|
326 |
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|
327 |
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/* __sel_register_typed_name allocates lots of struct objc_selector:s
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328 |
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of 8 (16, if pointers are 64 bits) bytes at startup. To reduce the number
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329 |
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of malloc calls and memory lost to malloc overhead, we allocate
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330 |
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objc_selector:s in blocks here. This is only called from
|
331 |
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__sel_register_typed_name, and __sel_register_typed_name may only be
|
332 |
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called when __objc_runtime_mutex is locked.
|
333 |
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|
334 |
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Note that the objc_selector:s allocated from __sel_register_typed_name
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are never freed.
|
336 |
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|
|
337 |
|
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62 because 62 * sizeof (struct objc_selector) = 496 (992). This should
|
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let malloc add some overhead and use a nice, round 512 (1024) byte chunk.
|
339 |
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*/
|
340 |
|
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#define SELECTOR_POOL_SIZE 62
|
341 |
|
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static struct objc_selector *selector_pool;
|
342 |
|
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static int selector_pool_left;
|
343 |
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|
344 |
|
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static struct objc_selector *
|
345 |
|
|
pool_alloc_selector(void)
|
346 |
|
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{
|
347 |
|
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if (!selector_pool_left)
|
348 |
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{
|
349 |
|
|
selector_pool = objc_malloc (sizeof (struct objc_selector)
|
350 |
|
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* SELECTOR_POOL_SIZE);
|
351 |
|
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selector_pool_left = SELECTOR_POOL_SIZE;
|
352 |
|
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}
|
353 |
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return &selector_pool[--selector_pool_left];
|
354 |
|
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}
|
355 |
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|
356 |
|
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/* Store the passed selector name in the selector record and return its
|
357 |
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selector value (value returned by sel_get_uid).
|
358 |
|
|
Assumes that the calling function has locked down __objc_runtime_mutex. */
|
359 |
|
|
/* is_const parameter tells us if the name and types parameters
|
360 |
|
|
are really constant or not. If YES then they are constant and
|
361 |
|
|
we can just store the pointers. If NO then we need to copy
|
362 |
|
|
name and types because the pointers may disappear later on. */
|
363 |
|
|
SEL
|
364 |
|
|
__sel_register_typed_name (const char *name, const char *types,
|
365 |
|
|
struct objc_selector *orig, BOOL is_const)
|
366 |
|
|
{
|
367 |
|
|
struct objc_selector *j;
|
368 |
|
|
sidx i;
|
369 |
|
|
struct objc_list *l;
|
370 |
|
|
|
371 |
|
|
i = (sidx) objc_hash_value_for_key (__objc_selector_hash, name);
|
372 |
|
|
if (soffset_decode (i) != 0)
|
373 |
|
|
{
|
374 |
|
|
for (l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);
|
375 |
|
|
l; l = l->tail)
|
376 |
|
|
{
|
377 |
|
|
SEL s = (SEL) l->head;
|
378 |
|
|
if (types == 0 || s->sel_types == 0)
|
379 |
|
|
{
|
380 |
|
|
if (s->sel_types == types)
|
381 |
|
|
{
|
382 |
|
|
if (orig)
|
383 |
|
|
{
|
384 |
|
|
orig->sel_id = (void *) i;
|
385 |
|
|
return orig;
|
386 |
|
|
}
|
387 |
|
|
else
|
388 |
|
|
return s;
|
389 |
|
|
}
|
390 |
|
|
}
|
391 |
|
|
else if (! strcmp (s->sel_types, types))
|
392 |
|
|
{
|
393 |
|
|
if (orig)
|
394 |
|
|
{
|
395 |
|
|
orig->sel_id = (void *) i;
|
396 |
|
|
return orig;
|
397 |
|
|
}
|
398 |
|
|
else
|
399 |
|
|
return s;
|
400 |
|
|
}
|
401 |
|
|
}
|
402 |
|
|
if (orig)
|
403 |
|
|
j = orig;
|
404 |
|
|
else
|
405 |
|
|
j = pool_alloc_selector ();
|
406 |
|
|
|
407 |
|
|
j->sel_id = (void *) i;
|
408 |
|
|
/* Can we use the pointer or must copy types? Don't copy if NULL */
|
409 |
|
|
if ((is_const) || (types == 0))
|
410 |
|
|
j->sel_types = (const char *) types;
|
411 |
|
|
else {
|
412 |
|
|
j->sel_types = (char *) objc_malloc (strlen (types) + 1);
|
413 |
|
|
strcpy ((char *) j->sel_types, types);
|
414 |
|
|
}
|
415 |
|
|
l = (struct objc_list *) sarray_get_safe (__objc_selector_array, i);
|
416 |
|
|
}
|
417 |
|
|
else
|
418 |
|
|
{
|
419 |
|
|
__objc_selector_max_index += 1;
|
420 |
|
|
i = soffset_encode (__objc_selector_max_index);
|
421 |
|
|
if (orig)
|
422 |
|
|
j = orig;
|
423 |
|
|
else
|
424 |
|
|
j = pool_alloc_selector ();
|
425 |
|
|
|
426 |
|
|
j->sel_id = (void *) i;
|
427 |
|
|
/* Can we use the pointer or must copy types? Don't copy if NULL */
|
428 |
|
|
if ((is_const) || (types == 0))
|
429 |
|
|
j->sel_types = (const char *) types;
|
430 |
|
|
else {
|
431 |
|
|
j->sel_types = (char *) objc_malloc (strlen (types) + 1);
|
432 |
|
|
strcpy ((char *) j->sel_types, types);
|
433 |
|
|
}
|
434 |
|
|
l = 0;
|
435 |
|
|
}
|
436 |
|
|
|
437 |
|
|
DEBUG_PRINTF ("Record selector %s[%s] as: %ld\n", name, types,
|
438 |
|
|
(long) soffset_decode (i));
|
439 |
|
|
|
440 |
|
|
{
|
441 |
|
|
int is_new = (l == 0);
|
442 |
|
|
const char *new_name;
|
443 |
|
|
|
444 |
|
|
/* Can we use the pointer or must copy name? Don't copy if NULL */
|
445 |
|
|
if ((is_const) || (name == 0))
|
446 |
|
|
new_name = name;
|
447 |
|
|
else {
|
448 |
|
|
new_name = (char *) objc_malloc (strlen (name) + 1);
|
449 |
|
|
strcpy ((char *) new_name, name);
|
450 |
|
|
}
|
451 |
|
|
|
452 |
|
|
l = list_cons ((void *) j, l);
|
453 |
|
|
sarray_at_put_safe (__objc_selector_names, i, (void *) new_name);
|
454 |
|
|
sarray_at_put_safe (__objc_selector_array, i, (void *) l);
|
455 |
|
|
if (is_new)
|
456 |
|
|
objc_hash_add (&__objc_selector_hash, (void *) new_name, (void *) i);
|
457 |
|
|
}
|
458 |
|
|
|
459 |
|
|
sarray_realloc (__objc_uninstalled_dtable, __objc_selector_max_index + 1);
|
460 |
|
|
|
461 |
|
|
return (SEL) j;
|
462 |
|
|
}
|
463 |
|
|
|
464 |
|
|
SEL
|
465 |
|
|
sel_register_name (const char *name)
|
466 |
|
|
{
|
467 |
|
|
SEL ret;
|
468 |
|
|
|
469 |
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
470 |
|
|
/* Assume that name is not constant static memory and needs to be
|
471 |
|
|
copied before put into a runtime structure. is_const == NO */
|
472 |
|
|
ret = __sel_register_typed_name (name, 0, 0, NO);
|
473 |
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
474 |
|
|
|
475 |
|
|
return ret;
|
476 |
|
|
}
|
477 |
|
|
|
478 |
|
|
SEL
|
479 |
|
|
sel_register_typed_name (const char *name, const char *type)
|
480 |
|
|
{
|
481 |
|
|
SEL ret;
|
482 |
|
|
|
483 |
|
|
objc_mutex_lock (__objc_runtime_mutex);
|
484 |
|
|
/* Assume that name and type are not constant static memory and need to
|
485 |
|
|
be copied before put into a runtime structure. is_const == NO */
|
486 |
|
|
ret = __sel_register_typed_name (name, type, 0, NO);
|
487 |
|
|
objc_mutex_unlock (__objc_runtime_mutex);
|
488 |
|
|
|
489 |
|
|
return ret;
|
490 |
|
|
}
|