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558 lines
16 KiB
C
558 lines
16 KiB
C
/* GNU Objective C Runtime protocol related functions.
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Copyright (C) 2010-2018 Free Software Foundation, Inc.
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Contributed by Nicola Pero
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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 3, 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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "objc-private/common.h"
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#include "objc/runtime.h"
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#include "objc-private/module-abi-8.h" /* For runtime structures */
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#include "objc/thr.h"
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#include "objc-private/runtime.h" /* the kitchen sink */
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#include "objc-private/hash.h" /* For the hash table of protocols. */
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#include "objc-private/protocols.h" /* For __objc_protocols_init() and
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__objc_protocols_add_protocol(). */
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#include <stdlib.h> /* For malloc. */
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/* This is a table that maps a name to a Protocol instance with that
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name. Because there may be multiple Protocol instances with the
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same name (no harm in that) the table records only one
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instance. */
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static cache_ptr __protocols_hashtable;
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/* A mutex protecting the protocol_hashtable. */
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static objc_mutex_t __protocols_hashtable_lock = NULL;
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/* Called at startup by init.c. */
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void
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__objc_protocols_init (void)
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{
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__protocols_hashtable_lock = objc_mutex_allocate ();
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/* The keys in the table are strings, and the values are Protocol
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objects. */
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__protocols_hashtable = objc_hash_new (64, (hash_func_type) objc_hash_string,
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(compare_func_type) objc_compare_strings);
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}
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/* Add a protocol to the hashtable. */
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void
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__objc_protocols_add_protocol (const char *name, struct objc_protocol *object)
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{
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objc_mutex_lock (__protocols_hashtable_lock);
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/* If we find a protocol with the same name already in the
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hashtable, we do not need to add the new one, because it will be
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identical to it. This in the reasonable assumption that two
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protocols with the same name are identical, which is expected in
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any sane program. If we are really paranoid, we would compare
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the protocols and abort if they are not identical.
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Unfortunately, this would slow down the startup of all
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Objective-C programs while trying to catch a problem that has
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never been seen in practice, so we don't do it. */
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if (! objc_hash_is_key_in_hash (__protocols_hashtable, name))
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objc_hash_add (&__protocols_hashtable, name, object);
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objc_mutex_unlock (__protocols_hashtable_lock);
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}
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Protocol *
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objc_getProtocol (const char *name)
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{
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Protocol *protocol;
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if (name == NULL)
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return NULL;
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objc_mutex_lock (__protocols_hashtable_lock);
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protocol = (Protocol *)(objc_hash_value_for_key (__protocols_hashtable, name));
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objc_mutex_unlock (__protocols_hashtable_lock);
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return protocol;
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}
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Protocol **
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objc_copyProtocolList (unsigned int *numberOfReturnedProtocols)
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{
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unsigned int count = 0;
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Protocol **returnValue = NULL;
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node_ptr node;
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objc_mutex_lock (__protocols_hashtable_lock);
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/* Count how many protocols we have. */
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node = objc_hash_next (__protocols_hashtable, NULL);
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while (node)
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{
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count++;
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node = objc_hash_next (__protocols_hashtable, node);
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}
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if (count != 0)
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{
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unsigned int i = 0;
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/* Allocate enough memory to hold them. */
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returnValue = (Protocol **)(malloc (sizeof (Protocol *) * (count + 1)));
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/* Copy the protocols. */
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node = objc_hash_next (__protocols_hashtable, NULL);
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while (node)
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{
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returnValue[i] = node->value;
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i++;
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node = objc_hash_next (__protocols_hashtable, node);
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}
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returnValue[i] = NULL;
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}
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objc_mutex_unlock (__protocols_hashtable_lock);
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if (numberOfReturnedProtocols)
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*numberOfReturnedProtocols = count;
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return returnValue;
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}
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BOOL
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class_addProtocol (Class class_, Protocol *protocol)
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{
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struct objc_protocol_list *protocols;
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if (class_ == Nil || protocol == NULL)
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return NO;
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if (class_conformsToProtocol (class_, protocol))
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return NO;
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return NO;
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objc_mutex_lock (__objc_runtime_mutex);
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/* Create the objc_protocol_list. */
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protocols = malloc (sizeof (struct objc_protocol_list));
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protocols->count = 1;
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protocols->list[0] = (struct objc_protocol *)protocol;
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/* Attach it to the list of class protocols. */
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protocols->next = class_->protocols;
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class_->protocols = protocols;
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objc_mutex_unlock (__objc_runtime_mutex);
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return YES;
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}
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BOOL
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class_conformsToProtocol (Class class_, Protocol *protocol)
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{
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struct objc_protocol_list* proto_list;
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if (class_ == Nil || protocol == NULL)
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return NO;
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return NO;
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/* Acquire the runtime lock because the list of protocols for a
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class may be modified concurrently, for example if another thread
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calls class_addProtocol(), or dynamically loads from a file a
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category of the class. */
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objc_mutex_lock (__objc_runtime_mutex);
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proto_list = class_->protocols;
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while (proto_list)
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{
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size_t i;
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for (i = 0; i < proto_list->count; i++)
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{
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if (proto_list->list[i] == (struct objc_protocol *)protocol
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|| protocol_conformsToProtocol ((Protocol *)proto_list->list[i],
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protocol))
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{
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objc_mutex_unlock (__objc_runtime_mutex);
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return YES;
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}
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}
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proto_list = proto_list->next;
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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return NO;
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}
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Protocol **
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class_copyProtocolList (Class class_, unsigned int *numberOfReturnedProtocols)
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{
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unsigned int count = 0;
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Protocol **returnValue = NULL;
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struct objc_protocol_list* proto_list;
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if (class_ == Nil)
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{
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if (numberOfReturnedProtocols)
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*numberOfReturnedProtocols = 0;
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return NULL;
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}
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/* Lock the runtime mutex because the class protocols may be
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concurrently modified. */
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objc_mutex_lock (__objc_runtime_mutex);
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/* Count how many protocols we have. */
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proto_list = class_->protocols;
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while (proto_list)
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{
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count = count + proto_list->count;
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proto_list = proto_list->next;
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}
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if (count != 0)
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{
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unsigned int i = 0;
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/* Allocate enough memory to hold them. */
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returnValue = (Protocol **)(malloc (sizeof (Protocol *) * (count + 1)));
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/* Copy the protocols. */
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proto_list = class_->protocols;
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while (proto_list)
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{
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size_t j;
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for (j = 0; j < proto_list->count; j++)
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{
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returnValue[i] = (Protocol *)proto_list->list[j];
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i++;
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}
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proto_list = proto_list->next;
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}
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returnValue[i] = NULL;
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}
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objc_mutex_unlock (__objc_runtime_mutex);
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if (numberOfReturnedProtocols)
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*numberOfReturnedProtocols = count;
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return returnValue;
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}
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BOOL
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protocol_conformsToProtocol (Protocol *protocol, Protocol *anotherProtocol)
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{
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struct objc_protocol_list* proto_list;
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if (protocol == NULL || anotherProtocol == NULL)
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return NO;
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if (protocol == anotherProtocol)
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return YES;
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/* Check that the objects are Protocol objects before casting them
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to (struct objc_protocol *). */
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if (protocol->class_pointer != anotherProtocol->class_pointer)
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return NO;
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return NO;
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if (strcmp (((struct objc_protocol *)protocol)->protocol_name,
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((struct objc_protocol *)anotherProtocol)->protocol_name) == 0)
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return YES;
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/* We do not acquire any lock because protocols are currently
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immutable. We can freely iterate over a protocol structure. */
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proto_list = ((struct objc_protocol *)protocol)->protocol_list;
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while (proto_list)
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{
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size_t i;
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for (i = 0; i < proto_list->count; i++)
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{
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if (protocol_conformsToProtocol ((Protocol *)proto_list->list[i], anotherProtocol))
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return YES;
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}
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proto_list = proto_list->next;
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}
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return NO;
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}
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BOOL
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protocol_isEqual (Protocol *protocol, Protocol *anotherProtocol)
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{
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if (protocol == anotherProtocol)
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return YES;
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if (protocol == NULL || anotherProtocol == NULL)
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return NO;
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/* Check that the objects are Protocol objects before casting them
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to (struct objc_protocol *). */
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if (protocol->class_pointer != anotherProtocol->class_pointer)
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return NO;
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return NO;
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/* Equality between formal protocols is only formal (nothing to do
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with actually checking the list of methods they have!). Two
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formal Protocols are equal if and only if they have the same
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name.
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Please note (for comparisons with other implementations) that
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checking the names is equivalent to checking that Protocol A
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conforms to Protocol B and Protocol B conforms to Protocol A,
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because this happens iff they have the same name. If they have
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different names, A conforms to B if and only if A includes B, but
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the situation where A includes B and B includes A is a circular
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dependency between Protocols which is forbidden by the compiler,
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so A conforms to B and B conforms to A with A and B having
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different names is an impossible case. */
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if (strcmp (((struct objc_protocol *)protocol)->protocol_name,
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((struct objc_protocol *)anotherProtocol)->protocol_name) == 0)
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return YES;
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return NO;
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}
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const char *
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protocol_getName (Protocol *protocol)
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{
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return NULL;
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return ((struct objc_protocol *)protocol)->protocol_name;
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}
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struct objc_method_description protocol_getMethodDescription (Protocol *protocol,
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SEL selector,
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BOOL requiredMethod,
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BOOL instanceMethod)
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{
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struct objc_method_description no_result = { NULL, NULL };
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struct objc_method_description_list *methods;
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int i;
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/* TODO: New ABI. */
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/* The current ABI does not have any information on optional protocol methods. */
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if (! requiredMethod)
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return no_result;
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return no_result;
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if (instanceMethod)
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methods = ((struct objc_protocol *)protocol)->instance_methods;
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else
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methods = ((struct objc_protocol *)protocol)->class_methods;
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if (methods)
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{
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for (i = 0; i < methods->count; i++)
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{
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if (sel_isEqual (methods->list[i].name, selector))
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return methods->list[i];
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/*
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if (strcmp (sel_getName (methods->list[i].name), selector_name) == 0)
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return methods->list[i];
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*/
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}
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}
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return no_result;
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}
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struct objc_method_description *protocol_copyMethodDescriptionList (Protocol *protocol,
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BOOL requiredMethod,
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BOOL instanceMethod,
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unsigned int *numberOfReturnedMethods)
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{
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struct objc_method_description_list *methods;
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unsigned int count = 0;
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struct objc_method_description *returnValue = NULL;
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/* TODO: New ABI */
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/* The current ABI does not have any information on optional protocol methods. */
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if (! requiredMethod)
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{
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if (numberOfReturnedMethods)
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*numberOfReturnedMethods = 0;
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return NULL;
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}
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol == NULL || protocol->class_pointer != objc_lookUpClass ("Protocol"))
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{
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if (numberOfReturnedMethods)
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*numberOfReturnedMethods = 0;
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return NULL;
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}
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/* We do not acquire any lock because protocols are currently
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immutable. We can freely iterate over a protocol structure. */
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if (instanceMethod)
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methods = ((struct objc_protocol *)protocol)->instance_methods;
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else
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methods = ((struct objc_protocol *)protocol)->class_methods;
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if (methods)
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{
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unsigned int i;
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count = methods->count;
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/* Allocate enough memory to hold them. */
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returnValue = (struct objc_method_description *)(malloc (sizeof (struct objc_method_description) * (count + 1)));
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/* Copy them. */
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for (i = 0; i < count; i++)
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{
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returnValue[i].name = methods->list[i].name;
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returnValue[i].types = methods->list[i].types;
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}
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returnValue[i].name = NULL;
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returnValue[i].types = NULL;
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}
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if (numberOfReturnedMethods)
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*numberOfReturnedMethods = count;
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return returnValue;
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}
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Property protocol_getProperty (Protocol *protocol, const char *propertyName,
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BOOL requiredProperty, BOOL instanceProperty)
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{
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if (protocol == NULL || propertyName == NULL)
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return NULL;
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if (!requiredProperty || !instanceProperty)
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return NULL;
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol->class_pointer != objc_lookUpClass ("Protocol"))
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return NULL;
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/* TODO: New ABI. */
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/* The current ABI does not have any information on protocol properties. */
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return NULL;
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}
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Property *protocol_copyPropertyList (Protocol *protocol, unsigned int *numberOfReturnedProperties)
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{
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unsigned int count = 0;
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Property *returnValue = NULL;
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol == NULL || protocol->class_pointer != objc_lookUpClass ("Protocol"))
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{
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if (numberOfReturnedProperties)
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*numberOfReturnedProperties = 0;
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return NULL;
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}
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/* We do not acquire any lock because protocols are currently
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immutable. We can freely iterate over a protocol structure. */
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/* TODO: New ABI. */
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/* The current ABI does not have any information on protocol properties. */
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if (numberOfReturnedProperties)
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*numberOfReturnedProperties = count;
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return returnValue;
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}
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Protocol **protocol_copyProtocolList (Protocol *protocol, unsigned int *numberOfReturnedProtocols)
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{
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unsigned int count = 0;
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Protocol **returnValue = NULL;
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struct objc_protocol_list* proto_list;
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/* Check that it is a Protocol object before casting it to (struct
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objc_protocol *). */
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if (protocol == NULL || protocol->class_pointer != objc_lookUpClass ("Protocol"))
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{
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if (numberOfReturnedProtocols)
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*numberOfReturnedProtocols = 0;
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return NULL;
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}
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/* We do not acquire any lock because protocols are currently
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immutable. We can freely iterate over a protocol structure. */
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/* Count how many protocols we have. */
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proto_list = ((struct objc_protocol *)protocol)->protocol_list;
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while (proto_list)
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{
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count = count + proto_list->count;
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proto_list = proto_list->next;
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}
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if (count != 0)
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{
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unsigned int i = 0;
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/* Allocate enough memory to hold them. */
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returnValue = (Protocol **)(malloc (sizeof (Protocol *) * (count + 1)));
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/* Copy the protocols. */
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proto_list = ((struct objc_protocol *)protocol)->protocol_list;
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while (proto_list)
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{
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size_t j;
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for (j = 0; j < proto_list->count; j++)
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{
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returnValue[i] = (Protocol *)proto_list->list[j];
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i++;
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}
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proto_list = proto_list->next;
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}
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returnValue[i] = NULL;
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}
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if (numberOfReturnedProtocols)
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*numberOfReturnedProtocols = count;
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return returnValue;
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}
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