summaryrefslogtreecommitdiff
path: root/libobjc/objc/objc.h
blob: cc822edf5d37c693c4eab075e80e80e727e9cfc6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/* Basic data types for Objective C.
   Copyright (C) 1993, 1995, 1996, 2004 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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.

GCC 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 GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, 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.  */

#ifndef __objc_INCLUDE_GNU
#define __objc_INCLUDE_GNU

#ifdef __cplusplus
extern "C" {
#endif

#include <stddef.h>

/*
** Definition of the boolean type.  
*/
#ifdef __vxworks
typedef int BOOL;
#else
#undef BOOL
typedef unsigned char  BOOL;
#endif
#define YES   (BOOL)1
#define NO    (BOOL)0

/*
** Definition of a selector.  Selectors themselves are not unique, but
** the sel_id is a unique identifier.
*/
typedef const struct objc_selector 
{
  void *sel_id;
  const char *sel_types;
} *SEL;

inline static BOOL
sel_eq (SEL s1, SEL s2)
{
  if (s1 == 0 || s2 == 0)
    return s1 == s2;
  else
    return s1->sel_id == s2->sel_id;
}


/*
** ObjC uses this typedef for untyped instances.
*/
typedef struct objc_object {
  struct objc_class*  class_pointer;
} *id;

/*
** Definition of method type.  When retrieving the implementation of a
** method, this is type of the pointer returned.  The idea of the
** definition of IMP is to represent a 'pointer to a general function
** taking an id, a SEL, followed by other unspecified arguments'.  You
** must always cast an IMP to a pointer to a function taking the
** appropriate, specific types for that function, before calling it -
** to make sure the appropriate arguments are passed to it.  The code
** generated by the compiler to perform method calls automatically
** does this cast inside method calls.
*/
typedef id (*IMP)(id, SEL, ...); 

/*
** More simple types...
*/
#define nil (id)0                               /* id of Nil instance */
#define Nil (Class)0                            /* id of Nil class */
typedef char *STR;                              /* String alias */

/*
** The compiler generates one of these structures for each class.  
** 
** This structure is the definition for classes. 
** 
** This structure is generated by the compiler in the executable and used by
** the run-time during normal messaging operations.  Therefore some members
** change type. The compiler generates "char* const" and places a string in
** the following member variables:  super_class. 
*/
typedef struct objc_class *MetaClass;
typedef struct objc_class *Class;
struct objc_class {     
  MetaClass           class_pointer;          /* Pointer to the class's
                                                meta class. */
  struct objc_class*  super_class;            /* Pointer to the super 
                                                class. NULL for class 
                                                Object. */
  const char*         name;                   /* Name of the class. */
  long                version;                /* Unknown. */
  unsigned long       info;                   /* Bit mask.  See class masks 
                                                defined above. */
  long                instance_size;          /* Size in bytes of the class.  
                                                The sum of the class 
						definition and all super 
						class definitions. */
  struct objc_ivar_list* ivars;               /* Pointer to a structure that
                                                describes the instance 
                                                variables in the class
                                                definition.  NULL indicates
                                                no instance variables.  Does
                                                not include super class
                                                variables. */
  struct objc_method_list*  methods;          /* Linked list of instance
                                                methods defined for the 
                                                class. */
  struct sarray *    dtable;                  /* Pointer to instance 
					         method dispatch table. */  
  struct objc_class* subclass_list;           /* Subclasses */
  struct objc_class* sibling_class;

  struct objc_protocol_list *protocols;	      /* Protocols conformed to */
  void* gc_object_type;
};

#ifndef __OBJC__
typedef struct objc_protocol {
  struct objc_class* class_pointer;
  char *protocol_name;
  struct objc_protocol_list *protocol_list;
  struct objc_method_description_list *instance_methods, *class_methods; 
} Protocol; 

#else /* __OBJC__ */
@class Protocol;
#endif 

typedef void* retval_t;		/* return value */
typedef void(*apply_t)(void);	/* function pointer */
typedef union arglist {
  char *arg_ptr;
  char arg_regs[sizeof (char*)];
} *arglist_t;			/* argument frame */


IMP objc_msg_lookup(id receiver, SEL op);

#ifdef __cplusplus
}
#endif

#endif /* not __objc_INCLUDE_GNU */