1998-09-21 Ben Elliston <bje@cygnus.com>

        * New directory.  Moved files from ../gcc/objc.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@22514 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 128 insertions, 0 deletions

diff --git a/libobjc/Protocol.m b/libobjc/Protocol.m
new file mode 100644
index 00000000000..43ba44eaf4f
--- /dev/null
+++ b/libobjc/Protocol.m
@@ -0,0 +1,128 @@
+/* This file contains the implementation of class Protocol.
+   Copyright (C) 1993 Free Software Foundation, Inc.
+
+This file is part of GNU CC. 
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+ 
+/* As a special exception, if you link this library with files
+   compiled with GCC to produce an executable, this does not cause
+   the resulting executable to be covered by the GNU General Public License.
+   This exception does not however invalidate any other reasons why
+   the executable file might be covered by the GNU General Public License.  */
+
+#include "objc/Protocol.h"
+#include "objc/objc-api.h"
+
+/* Method description list */
+struct objc_method_description_list {
+        int count;
+        struct objc_method_description list[1];
+};
+
+
+@implementation Protocol
+{
+@private
+        char *protocol_name;
+        struct objc_protocol_list *protocol_list;
+        struct objc_method_description_list *instance_methods, *class_methods; 
+}
+
+/* Obtaining attributes intrinsic to the protocol */
+
+- (const char *)name
+{
+  return protocol_name;
+}
+
+/* Testing protocol conformance */
+
+- (BOOL) conformsTo: (Protocol *)aProtocolObject
+{
+  int i;
+  struct objc_protocol_list* proto_list;
+
+  if (!strcmp(aProtocolObject->protocol_name, self->protocol_name))
+    return YES;
+
+  for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
+    {
+      for (i=0; i < proto_list->count; i++)
+	{
+	  if ([proto_list->list[i] conformsTo: aProtocolObject])
+	    return YES;
+	}
+    }
+
+  return NO;
+}
+
+/* Looking up information specific to a protocol */
+
+- (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
+{
+  int i;
+  struct objc_protocol_list* proto_list;
+  const char* name = sel_get_name (aSel);
+  struct objc_method_description *result;
+
+  for (i = 0; i < instance_methods->count; i++)
+    {
+      if (!strcmp ((char*)instance_methods->list[i].name, name))
+	return &(instance_methods->list[i]);
+    }
+
+  for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
+    {
+      for (i=0; i < proto_list->count; i++)
+	{
+	  if ((result = [proto_list->list[i]
+			 descriptionForInstanceMethod: aSel]))
+	    return result;
+	}
+    }
+
+  return NULL;
+}
+
+- (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel;
+{
+  int i;
+  struct objc_protocol_list* proto_list;
+  const char* name = sel_get_name (aSel);
+  struct objc_method_description *result;
+
+  for (i = 0; i < class_methods->count; i++)
+    {
+      if (!strcmp ((char*)class_methods->list[i].name, name))
+	return &(class_methods->list[i]);
+    }
+
+  for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
+    {
+      for (i=0; i < proto_list->count; i++)
+	{
+	  if ((result = [proto_list->list[i]
+			 descriptionForClassMethod: aSel]))
+	    return result;
+	}
+    }
+
+  return NULL;
+}
+
+@end