1/* Basic data types for Objective C.
2   Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
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.  */
26
27#ifndef __objc_INCLUDE_GNU
28#define __objc_INCLUDE_GNU
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34#include <stddef.h>
35
36/*
37** Definition of the boolean type.
38*/
39#ifdef __vxworks
40typedef int BOOL;
41#else
42typedef unsigned char  BOOL;
43#endif
44#define YES   (BOOL)1
45#define NO    (BOOL)0
46
47/*
48** Definition of a selector.  Selectors themselves are not unique, but
49** the sel_id is a unique identifier.
50*/
51typedef const struct objc_selector
52{
53  void *sel_id;
54  const char *sel_types;
55} *SEL;
56
57inline static BOOL
58sel_eq (SEL s1, SEL s2)
59{
60  if (s1 == 0 || s2 == 0)
61    return s1 == s2;
62  else
63    return s1->sel_id == s2->sel_id;
64}
65
66
67/*
68** ObjC uses this typedef for untyped instances.
69*/
70typedef struct objc_object {
71  struct objc_class*  class_pointer;
72} *id;
73
74/*
75** Definition of method type.  When retrieving the implementation of a
76** method, this is type of the pointer returned
77*/
78typedef id (*IMP)(id, SEL, ...);
79
80/*
81** More simple types...
82*/
83#define nil (id)0                               /* id of Nil instance */
84#define Nil (Class)0                            /* id of Nil class */
85typedef char *STR;                              /* String alias */
86
87/*
88** The compiler generates one of these structures for each class.
89**
90** This structure is the definition for classes.
91**
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.
96*/
97typedef struct objc_class *MetaClass;
98typedef struct objc_class *Class;
99struct objc_class {
100  MetaClass           class_pointer;          /* Pointer to the class's
101                                                meta class. */
102  struct objc_class*  super_class;            /* Pointer to the super
103                                                class. NULL for class
104                                                Object. */
105  const char*         name;                   /* Name of the class. */
106  long                version;                /* Unknown. */
107  unsigned long       info;                   /* Bit mask.  See class masks
108                                                defined above. */
109  long                instance_size;          /* Size in bytes of the class.
110                                                The sum 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
119                                                variables. */
120  struct objc_method_list*  methods;          /* Linked list of instance
121                                                methods defined for the
122                                                class. */
123  struct sarray *    dtable;                  /* Pointer to instance
124					         method dispatch table. */
125  struct objc_class* subclass_list;           /* Subclasses */
126  struct objc_class* sibling_class;
127
128  struct objc_protocol_list *protocols;	      /* Protocols conformed to */
129  void* gc_object_type;
130};
131
132#ifndef __OBJC__
133typedef struct objc_protocol {
134  struct objc_class* class_pointer;
135  char *protocol_name;
136  struct objc_protocol_list *protocol_list;
137  struct objc_method_description_list *instance_methods, *class_methods;
138} Protocol;
139
140#else /* __OBJC__ */
141@class Protocol;
142#endif
143
144typedef void* retval_t;		/* return value */
145typedef void(*apply_t)(void);	/* function pointer */
146typedef union {
147  char *arg_ptr;
148  char arg_regs[sizeof (char*)];
149} *arglist_t;			/* argument frame */
150
151
152IMP objc_msg_lookup(id receiver, SEL op);
153
154#ifdef __cplusplus
155}
156#endif
157
158#endif /* not __objc_INCLUDE_GNU */
159