1 /* This file contains the implementation of class Protocol.
2 Copyright (C) 1993, 2004 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* As a special exception, if you link this library with files
22 compiled with GCC to produce an executable, this does not cause
23 the resulting executable to be covered by the GNU General Public License.
24 This exception does not however invalidate any other reasons why
25 the executable file might be covered by the GNU General Public License. */
27 #include "objc/Protocol.h"
28 #include "objc/objc-api.h"
30 /* Method description list */
31 struct objc_method_description_list {
33 struct objc_method_description list[1];
37 @implementation Protocol
41 struct objc_protocol_list *protocol_list;
42 struct objc_method_description_list *instance_methods, *class_methods;
45 /* Obtaining attributes intrinsic to the protocol */
52 /* Testing protocol conformance */
54 - (BOOL) conformsTo: (Protocol *)aProtocolObject
57 struct objc_protocol_list* proto_list;
59 if (aProtocolObject == nil)
62 if (!strcmp(aProtocolObject->protocol_name, self->protocol_name))
65 for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
67 for (i=0; i < proto_list->count; i++)
69 if ([proto_list->list[i] conformsTo: aProtocolObject])
77 /* Looking up information specific to a protocol */
79 - (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
82 struct objc_protocol_list* proto_list;
83 const char* name = sel_get_name (aSel);
84 struct objc_method_description *result;
87 for (i = 0; i < instance_methods->count; i++)
89 if (!strcmp ((char*)instance_methods->list[i].name, name))
90 return &(instance_methods->list[i]);
93 for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
96 for (j=0; j < proto_list->count; j++)
98 if ((result = [proto_list->list[j]
99 descriptionForInstanceMethod: aSel]))
107 - (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel;
110 struct objc_protocol_list* proto_list;
111 const char* name = sel_get_name (aSel);
112 struct objc_method_description *result;
115 for (i = 0; i < class_methods->count; i++)
117 if (!strcmp ((char*)class_methods->list[i].name, name))
118 return &(class_methods->list[i]);
121 for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
124 for (j=0; j < proto_list->count; j++)
126 if ((result = [proto_list->list[j]
127 descriptionForClassMethod: aSel]))
137 /* Compute a hash of the protocol_name; use the same hash algorithm
138 * that we use for class names; protocol names and class names are
139 * somewhat similar types of string spaces.
143 for (index = 0; protocol_name[index] != '\0'; index++)
145 hash = (hash << 4) ^ (hash >> 28) ^ protocol_name[index];
148 hash = (hash ^ (hash >> 10) ^ (hash >> 20));
153 - (BOOL) isEqual: (id)obj
155 if (strcmp (protocol_name, [obj name]) == 0)