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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
|
/* -*-c-*-
* This file contains declarations used by the run-time system.
*
* Most of these declarations are defined by virtue of data
* structures produced by the compiler.
*
* Copyright (C) 1991 Threaded Technologies Inc.
*
* This program 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 1, or any later version.
*
* This program 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 receive a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
$Header: /usr/user/dennis_glatting/ObjC/c-runtime/include/RCS/ObjC.h,v 0.9 1991/12/10 12:04:22 dennisg Exp dennisg $
$Author: dennisg $
$Date: 1991/12/10 12:04:22 $
$Log: ObjC.h,v $
* Revision 0.9 1991/12/10 12:04:22 dennisg
* Cleaned up file format for a distribution.
*
* Revision 0.8 1991/12/01 01:29:29 dennisg
* modified to remove changes previously made to
* implement posing. posing just got easy.
*
* Revision 0.7 1991/11/29 22:00:10 dennisg
* modified to implement set functions.
*
* Revision 0.6 1991/11/29 20:02:01 dennisg
* fixed several const decls. bozo.
*
* Revision 0.5 1991/11/29 00:24:14 dennisg
* many changes including posing, things to make the compiler
* happier, structure changes, and things to make it play better.
*
* Revision 0.4 1991/11/19 12:37:49 dennisg
* changed typedef and struct decls.
* the run-time was changed and those decls changed too.
*
* Revision 0.3 1991/11/16 15:57:35 dennisg
* changed the defs for class structures for new implementation of run-time.
* changed def of SEL back to its original type.
*
* Revision 0.2 1991/11/07 22:31:42 dennisg
* added copyleft.
*
* Revision 0.1 1991/10/24 00:19:24 dennisg
* Initial check in. Preliminary development stage.
*
*/
#ifndef _objc_INCLUDE_GNU
#define _objc_INCLUDE_GNU
/* If someone is using a c++
compiler then adjust the
types in the file back
to C. */
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/types.h>
#include <hash.h>
#include <stdarg.h>
#define nil ( id )0 /* id of Nil instance */
#define Nil ( Class_t )0 /* id of Nil class */
typedef char* STR; /* String alias */
/* Boolean typedefs */
typedef char BOOL;
#define YES (BOOL)1
#define NO (BOOL)0
/* Definition of a
selector. Selectors are
really of type char*. The
run-time hashes the
string's address to locate
the method. If the method
isn't in the hash table then
a search is made through the
class hierarchy using
strcmp() to locate the
method. */
#if 0
typedef struct objc_selector* SEL;
#else
typedef void* SEL;
#endif
/* ObjC uses this typedef
for untyped instances. */
typedef struct objc_object {
struct objc_class* isa;
} *id;
/* Prototype for method
functions. */
typedef id ( *IMP )( id, SEL, ... );
/* Filer types used to
describe Ivars and
Methods. */
#define _C_ID '@'
#define _C_CLASS '#'
#define _C_SEL ':'
#define _C_CHR 'c'
#define _C_UCHR 'C'
#define _C_SHT 's'
#define _C_USHT 'S'
#define _C_INT 'i'
#define _C_UINT 'I'
#define _C_LNG 'l'
#define _C_ULNG 'L'
#define _C_FLT 'f'
#define _C_DBL 'd'
#define _C_BFLD 'b'
#define _C_VOID 'v'
#define _C_UNDEF '?'
#define _C_PTR '^'
#define _C_CHARPTR '*'
#define _C_ARY_B '['
#define _C_ARY_E ']'
#define _C_UNION_B '('
#define _C_UNION_E ')'
#define _C_STRUCT_B '{'
#define _C_STRUCT_E '}'
/*
* These definitions are masks used with the "info" member variable in the
* class and meta class structures.
*/
#define CLS_CLASS 0x1L /* The structure is of type
class (Class_t). */
#define CLS_META 0x2L /* The structure is of type
meta class (MetaClass_t). */
#define CLS_INITIALIZED 0x4L /* Class is initialized. A
+initialize method is the
first message sent to a
class. It isn't guaranteed
to be sent only once. */
/* Set this variable to !0 to
have the messager print
messaging operations. */
extern BOOL objc_trace;
/*
* Whereas a Module (defined further down) is the root (typically) of a file,
* a Symtab is the root of the class and category definitions within the
* module.
*
* A Symtab contains a variable length array of pointers to classes and
* categories defined in the module.
*/
typedef struct objc_symtab {
u_long sel_ref_cnt; /* Unknown. */
SEL *refs; /* Unknown. */
u_short cls_def_cnt; /* Number of classes compiled
(defined) in the module. */
u_short cat_def_cnt; /* Number of categories
compiled (defined) in the
module. */
void *defs[1]; /* Variable array of pointers.
cls_def_cnt of type Class_t
followed by cat_def_cnt of
type Category_t. */
} Symtab, *Symtab_t;
/*
* The compiler generates one of these structures for each module that
* composes the executable (eg main.m).
*
* This data structure is the root of the definition tree for the module.
*
* A collect program runs between ld stages and creates a ObjC ctor array.
* That array holds a pointer to each module structure of the executable.
*/
typedef struct objc_module {
u_long version; /* Compiler revision. */
u_long size; /* sizeof(Module). */
const char* name; /* Name of the file where the
module was generated. The
name includes the path. */
Symtab_t symtab; /* Pointer to the Symtab of
the module. The Symtab
holds an array of pointers to
the classes and categories
defined in the module. */
} Module, *Module_t;
/*
* The compiler generates one of these structures for a class that has
* instance variables defined in its specification.
*/
typedef struct objc_ivar* Ivar_t;
typedef struct objc_ivar_list {
int ivar_count; /* Number of structures (Ivar)
contained in the list. One
structure per instance
variable defined in the
class. */
struct objc_ivar {
const char* ivar_name; /* Name of the instance
variable as entered in the
class definition. */
const char* ivar_type; /* Description of the Ivar's
type. Useful for
debuggers. */
int ivar_offset; /* Byte offset from the base
address of the instance
structure to the variable. */
} ivar_list[1]; /* Variable length
structure. */
} IvarList, *IvarList_t;
/*
* The compiler generates one (or more) of these structures for a class that
* has methods defined in its specification.
*
* The implementation of a class can be broken into separate pieces in a file
* and categories can break them across modules. To handle this problem is a
* singly linked list of methods.
*/
typedef struct objc_method Method;
typedef Method* Method_t;
typedef struct objc_method_list {
struct objc_method_list* method_next; /* This variable is used to link
a method list to another. It
is a singly linked list. */
int method_count; /* Number of methods defined in
this structure. */
struct objc_method {
SEL method_name; /* This variable is the method's
name. It is a char*.
The unique integer passed to
objc_msgSend() is a char* too.
It is compared against
method_name using strcmp(). */
const char* method_types; /* Description of the method's
parameter list. Useful for
debuggers. */
IMP method_imp; /* Address of the method in the
executable. */
} method_list[1]; /* Variable length
structure. */
} MethodList, *MethodList_t;
/*
* The compiler generates one of these structures for each class.
*
* This structure is the definition for meta classes. By definition a meta
* class is the class's class. Its most relevant contribution is that its
* method list contain the class's factory methods.
*
* 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: isa and super_class.
*/
typedef struct objc_metaClass {
struct objc_metaClass* isa; /* Pointer to Object meta
class. */
struct objc_metaClass* super_class; /* Pointer to meta class's
super class. NULL for
Object. */
const char* name; /* Name of the meta class. */
long version; /* Unknown. */
long info; /* Bit mask. See class masks
defined above. */
long instance_size; /* Always 0 except for Object.
Should be ignored. */
IvarList_t ivars; /* Always NULL except for
Object. Should be ignored. */
MethodList_t methods; /* Linked List of factory methods
for the class. */
Cache_t cache; /* Used to cache factory methods
defined for the class and its
super classes. Entries are
made to the cache as the
messager receives them. */
} MetaClass, *MetaClass_t;
/*
* 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_t isa; /* 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. */
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. */
IvarList_t 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. */
MethodList_t methods; /* Linked list of instance
methods defined for the
class. */
Cache_t cache; /* Used to cache instance methods
defined for the class and its
super classes. Entries are
made to the cache as the
messager receives them. */
} Class, *Class_t;
/*
* The compiler generates one of these structures for each category. A class
* may have many categories and contain both instance and factory methods.
*/
typedef struct objc_category {
const char* category_name; /* Name of the category. Name
contained in the () of the
category definition. */
const char* class_name; /* Name of the class to which
the category belongs. */
MethodList_t instance_methods; /* Linked list of instance
methods defined in the
category. NULL indicates no
instance methods defined. */
MethodList_t class_methods; /* Linked list of factory
methods defined in the
category. NULL indicates no
class methods defined. */
} Category, *Category_t;
/*
* Structure used when a message is send to a class's super class. The
* compiler generates one of these structures and passes it to
* objc_msgSuper().
*/
typedef struct objc_super {
id receiver; /* Id of the object sending
the message. */
Class_t class; /* Object's super class. */
} Super, *Super_t;
/*
* _alloc points to the function, called through class_createInstance(), used
* to allocate memory for new instances.
*/
extern id (*_alloc)(Class_t aClass);
/*
* _dealloc points to the function, called through object_dispose(), used to
* free instances.
*/
extern id (*_dealloc)(id aObject);
/*
* _realloc points to the function, called through object_realloc(), used to
* reallocate memory for an object
*/
extern id (*_realloc)(id aObject, u_int newSize);
/*
* _copy points to the function, called through object_copy(), used to create
* an exact copy of an object.
*/
extern id (*_copy)(id aObject);
/*
* _error points to the function that the run-time system calls in response
* to an error. By default, it prints formatted error messages to the
* standard error stream and calls abort() to produce a core file.
*/
extern void (*_error)(id aObject, const char* fmt, va_list ap);
#ifdef __cplusplus
}
#endif
#endif
|
