1 /* Basic data types for Objective C.
2 Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC 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 GNU CC 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 GNU CC; 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 #ifndef __objc_INCLUDE_GNU
28 #define __objc_INCLUDE_GNU
37 ** Definition of the boolean type.
42 typedef unsigned char BOOL;
48 ** Definition of a selector. Selectors themselves are not unique, but
49 ** the sel_id is a unique identifier.
51 typedef const struct objc_selector
54 const char *sel_types;
58 sel_eq (SEL s1, SEL s2)
60 if (s1 == 0 || s2 == 0)
63 return s1->sel_id == s2->sel_id;
68 ** ObjC uses this typedef for untyped instances.
70 typedef struct objc_object {
71 struct objc_class* class_pointer;
75 ** Definition of method type. When retrieving the implementation of a
76 ** method, this is type of the pointer returned
78 typedef id (*IMP)(id, SEL, ...);
81 ** More simple types...
83 #define nil (id)0 /* id of Nil instance */
84 #define Nil (Class)0 /* id of Nil class */
85 typedef char *STR; /* String alias */
88 ** The compiler generates one of these structures for each class.
90 ** This structure is the definition for classes.
92 ** This structure is generated by the compiler in the executable and used by
93 ** the run-time during normal messaging operations. Therefore some members
94 ** change type. The compiler generates "char* const" and places a string in
95 ** the following member variables: super_class.
97 typedef struct objc_class *MetaClass;
98 typedef struct objc_class *Class;
100 MetaClass class_pointer; /* Pointer to the class's
102 struct objc_class* super_class; /* Pointer to the super
103 class. NULL for class
105 const char* name; /* Name of the class. */
106 long version; /* Unknown. */
107 unsigned long info; /* Bit mask. See class masks
109 long instance_size; /* Size in bytes of the class.
111 definition and all super
112 class definitions. */
113 struct objc_ivar_list* ivars; /* Pointer to a structure that
114 describes the instance
115 variables in the class
116 definition. NULL indicates
117 no instance variables. Does
118 not include super class
120 struct objc_method_list* methods; /* Linked list of instance
121 methods defined for the
123 /* the idx in the sarray is the SEL sel_id, the value is the method-IMP */
124 struct sarray * dtable; /* Pointer to instance
125 method dispatch table. */
126 struct objc_class* subclass_list; /* Subclasses */
127 struct objc_class* sibling_class;
129 struct objc_protocol_list *protocols; /* Protocols conformed to */
130 void* gc_object_type;
134 typedef struct objc_protocol {
135 struct objc_class* class_pointer;
137 struct objc_protocol_list *protocol_list;
138 struct objc_method_description_list *instance_methods, *class_methods;
145 typedef void* retval_t; /* return value */
146 typedef void(*apply_t)(void); /* function pointer */
149 char arg_regs[sizeof (char*)];
150 } *arglist_t; /* argument frame */
153 IMP objc_msg_lookup(id receiver, SEL op);
159 #endif /* not __objc_INCLUDE_GNU */