Implement a hook that allows the compiler to register the aliases used with the
@compatibility_alias directive so that they can be resolved at runtime.main
thebeing
15 years ago
parent
ed9d0f33c9
commit
ee7817cf57
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/** Declaration of a helper function for getting class references from aliases.
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Copyright (c) 2011 Free Software Foundation, Inc.
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Written by: Niels Grewe <niels.grewe@halbordnung.de>
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Created: March 2011
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "objc/runtime.h"
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Class alias_getClass(const char *alias_name);
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@ -0,0 +1,125 @@
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/** A hash table for mapping compatibility aliases to classes.
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Copyright (c) 2011 Free Software Foundation, Inc.
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Written by: Niels Grewe <niels.grewe@halbordnung.de>
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Created: March 2011
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "objc/runtime.h"
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#include "class.h"
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#include "lock.h"
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#include "string_hash.h"
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#include <stdlib.h>
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struct objc_alias
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{
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const char* name;
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Class class;
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};
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typedef struct objc_alias *Alias;
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static int alias_compare(const char *name, const Alias alias)
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{
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return string_compare(name, alias->name);
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}
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static int alias_hash(const Alias alias)
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{
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return string_hash(alias->name);
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}
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#define MAP_TABLE_NAME alias_table_internal
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#define MAP_TABLE_COMPARE_FUNCTION alias_compare
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#define MAP_TABLE_HASH_KEY string_hash
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#define MAP_TABLE_HASH_VALUE alias_hash
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#include "hash_table.h"
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static alias_table_internal_table *alias_table;
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#define POOL_NAME alias
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#define POOL_TYPE struct objc_alias
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#include "pool.h"
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__attribute__((constructor)) static void alias_table_create_implicitly()
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{
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alias_table = alias_table_internal_create(128);
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}
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static Alias alias_table_get_safe(const char *alias_name)
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{
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return alias_table_internal_table_get(alias_table, alias_name);
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}
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Class alias_getClass(const char *alias_name)
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{
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if (NULL == alias_name)
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{
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return NULL;
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}
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Alias alias = alias_table_get_safe(alias_name);
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if (NULL == alias)
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{
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return NULL;
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}
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return alias->class;
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}
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void alias_table_insert(Alias alias)
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{
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alias_table_internal_insert(alias_table, alias);
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}
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BOOL class_registerAlias_np(Class class, const char *alias)
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{
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if ((NULL == alias) || (NULL == class))
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{
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return 0;
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}
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/*
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* If there already exists a matching alias, determine whether we the existing
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* alias is the correct one. Please note that objc_getClass() goes through the
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* alias lookup and will create the alias table if necessary.
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*/
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Class existingClass = (Class)objc_getClass(alias);
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if (NULL != existingClass)
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{
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/*
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* Return YES if the alias has already been registered for this very
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* class, and NO if the alias is already used for another class.
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*/
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return (class == existingClass);
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}
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Alias newAlias = alias_pool_alloc();
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newAlias->name = strdup(alias);
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newAlias->class = class;
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alias_table_insert(newAlias);
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return 1;
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}
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