1 /* GNU Objective-C Runtime API.
2 Copyright (C) 1993, 1995, 1996, 1997 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 it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 GNU CC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 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 compiled
22 with GCC to produce an executable, this does not cause the resulting
23 executable to be covered by the GNU General Public License. This
24 exception does not however invalidate any other reasons why the
25 executable file might be covered by the GNU General Public License. */
27 #ifndef __objc_api_INCLUDE_GNU
28 #define __objc_api_INCLUDE_GNU
30 #include "objc/objc.h"
31 #include "objc/hash.h"
36 /* For functions which return Method_t */
37 #define METHOD_NULL (Method_t)0
38 /* Boolean typedefs */
40 ** Method descriptor returned by introspective Object methods.
41 ** This is really just the first part of the more complete objc_method
42 ** structure defined below and used internally by the runtime.
44 struct objc_method_description
46 SEL name; /* this is a selector, not a string */
47 char *types; /* type encoding */
50 /* Filer types used to describe Ivars and Methods. */
68 #define _C_CHARPTR '*'
72 #define _C_UNION_B '('
73 #define _C_UNION_E ')'
74 #define _C_STRUCT_B '{'
75 #define _C_STRUCT_E '}'
81 ** Call objc_error() or objc_verror() to record an error; this error
82 ** routine will generally exit the program but not necessarily if the
83 ** user has installed his own error handler.
85 ** Call objc_set_error_handler to assign your own function for
86 ** handling errors. The function should return YES if it is ok
87 ** to continue execution, or return NO or just abort if the
88 ** program should be stopped. The default error handler is just to
89 ** print a message on stderr.
91 ** The error handler function should be of type objc_error_handler
92 ** The first parameter is an object instance of relevance.
93 ** The second parameter is an error code.
94 ** The third parameter is a format string in the printf style.
95 ** The fourth parameter is a variable list of arguments.
97 extern void objc_error(id object, int code, const char* fmt, ...);
98 extern void objc_verror(id object, int code, const char* fmt, va_list ap);
99 typedef BOOL (*objc_error_handler)(id, int code, const char *fmt, va_list ap);
100 objc_error_handler objc_set_error_handler(objc_error_handler func);
104 ** These are used by the runtime library, and your
105 ** error handling may use them to determine if the error is
106 ** hard or soft thus whether execution can continue or abort.
108 #define OBJC_ERR_UNKNOWN 0 /* Generic error */
110 #define OBJC_ERR_OBJC_VERSION 1 /* Incorrect runtime version */
111 #define OBJC_ERR_GCC_VERSION 2 /* Incorrect compiler version */
112 #define OBJC_ERR_MODULE_SIZE 3 /* Bad module size */
113 #define OBJC_ERR_PROTOCOL_VERSION 4 /* Incorrect protocol version */
115 #define OBJC_ERR_MEMORY 10 /* Out of memory */
117 #define OBJC_ERR_RECURSE_ROOT 20 /* Attempt to archive the root
118 object more than once. */
119 #define OBJC_ERR_BAD_DATA 21 /* Didn't read expected data */
120 #define OBJC_ERR_BAD_KEY 22 /* Bad key for object */
121 #define OBJC_ERR_BAD_CLASS 23 /* Unknown class */
122 #define OBJC_ERR_BAD_TYPE 24 /* Bad type specification */
123 #define OBJC_ERR_NO_READ 25 /* Cannot read stream */
124 #define OBJC_ERR_NO_WRITE 26 /* Cannot write stream */
125 #define OBJC_ERR_STREAM_VERSION 27 /* Incorrect stream version */
126 #define OBJC_ERR_BAD_OPCODE 28 /* Bad opcode */
128 #define OBJC_ERR_UNIMPLEMENTED 30 /* Method is not implemented */
131 ** Set this variable nonzero to print a line describing each
132 ** message that is sent. (this is currently disabled)
134 extern BOOL objc_trace;
137 /* For every class which happens to have statically allocated instances in
138 this module, one OBJC_STATIC_INSTANCES is allocated by the compiler.
139 INSTANCES is NULL terminated and points to all statically allocated
140 instances of this class. */
141 struct objc_static_instances
148 ** Whereas a Module (defined further down) is the root (typically) of a file,
149 ** a Symtab is the root of the class and category definitions within the
152 ** A Symtab contains a variable length array of pointers to classes and
153 ** categories defined in the module.
155 typedef struct objc_symtab {
156 unsigned long sel_ref_cnt; /* Unknown. */
157 SEL refs; /* Unknown. */
158 unsigned short cls_def_cnt; /* Number of classes compiled
159 (defined) in the module. */
160 unsigned short cat_def_cnt; /* Number of categories
161 compiled (defined) in the
164 void *defs[1]; /* Variable array of pointers.
165 cls_def_cnt of type Class
166 followed by cat_def_cnt of
167 type Category_t, followed
168 by a NULL terminated array
169 of objc_static_instances. */
174 ** The compiler generates one of these structures for each module that
175 ** composes the executable (eg main.m).
177 ** This data structure is the root of the definition tree for the module.
179 ** A collect program runs between ld stages and creates a ObjC ctor array.
180 ** That array holds a pointer to each module structure of the executable.
182 typedef struct objc_module {
183 unsigned long version; /* Compiler revision. */
184 unsigned long size; /* sizeof(Module). */
185 const char* name; /* Name of the file where the
186 module was generated. The
187 name includes the path. */
189 Symtab_t symtab; /* Pointer to the Symtab of
190 the module. The Symtab
193 the classes and categories
194 defined in the module. */
199 ** The compiler generates one of these structures for a class that has
200 ** instance variables defined in its specification.
202 typedef struct objc_ivar* Ivar_t;
203 typedef struct objc_ivar_list {
204 int ivar_count; /* Number of structures (Ivar)
205 contained in the list. One
206 structure per instance
207 variable defined in the
210 const char* ivar_name; /* Name of the instance
211 variable as entered in the
213 const char* ivar_type; /* Description of the Ivar's
216 int ivar_offset; /* Byte offset from the base
217 address of the instance
218 structure to the variable. */
220 } ivar_list[1]; /* Variable length
222 } IvarList, *IvarList_t;
226 ** The compiler generates one (or more) of these structures for a class that
227 ** has methods defined in its specification.
229 ** The implementation of a class can be broken into separate pieces in a file
230 ** and categories can break them across modules. To handle this problem is a
231 ** singly linked list of methods.
233 typedef struct objc_method Method;
234 typedef Method* Method_t;
235 typedef struct objc_method_list {
236 struct objc_method_list* method_next; /* This variable is used to link
237 a method list to another. It
238 is a singly linked list. */
239 int method_count; /* Number of methods defined in
242 SEL method_name; /* This variable is the method's
244 The unique integer passed to
245 objc_msg_send is a char* too.
246 It is compared against
247 method_name using strcmp. */
248 const char* method_types; /* Description of the method's
249 parameter list. Useful for
251 IMP method_imp; /* Address of the method in the
253 } method_list[1]; /* Variable length
255 } MethodList, *MethodList_t;
257 struct objc_protocol_list {
258 struct objc_protocol_list *next;
264 ** This is used to assure consistent access to the info field of
267 #ifndef HOST_BITS_PER_LONG
268 #define HOST_BITS_PER_LONG (sizeof(long)*8)
271 #define __CLS_INFO(cls) ((cls)->info)
272 #define __CLS_ISINFO(cls, mask) ((__CLS_INFO(cls)&mask)==mask)
273 #define __CLS_SETINFO(cls, mask) (__CLS_INFO(cls) |= mask)
275 /* The structure is of type MetaClass */
276 #define _CLS_META 0x2L
277 #define CLS_ISMETA(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_META))
280 /* The structure is of type Class */
281 #define _CLS_CLASS 0x1L
282 #define CLS_ISCLASS(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_CLASS))
285 ** The class is initialized within the runtime. This means that
286 ** it has had correct super and sublinks assigned
288 #define _CLS_RESOLV 0x8L
289 #define CLS_ISRESOLV(cls) __CLS_ISINFO(cls, _CLS_RESOLV)
290 #define CLS_SETRESOLV(cls) __CLS_SETINFO(cls, _CLS_RESOLV)
293 ** The class has been send a +initialize message or a such is not
294 ** defined for this class
296 #define _CLS_INITIALIZED 0x04L
297 #define CLS_ISINITIALIZED(cls) __CLS_ISINFO(cls, _CLS_INITIALIZED)
298 #define CLS_SETINITIALIZED(cls) __CLS_SETINFO(cls, _CLS_INITIALIZED)
301 ** The class number of this class. This must be the same for both the
302 ** class and it's meta class object
304 #define CLS_GETNUMBER(cls) (__CLS_INFO(cls) >> (HOST_BITS_PER_LONG/2))
305 #define CLS_SETNUMBER(cls, num) \
306 ({ (cls)->info <<= (HOST_BITS_PER_LONG/2); \
307 (cls)->info >>= (HOST_BITS_PER_LONG/2); \
308 __CLS_SETINFO(cls, (((unsigned long)num) << (HOST_BITS_PER_LONG/2))); })
311 ** The compiler generates one of these structures for each category. A class
312 ** may have many categories and contain both instance and factory methods.
314 typedef struct objc_category {
315 const char* category_name; /* Name of the category. Name
316 contained in the () of the
317 category definition. */
318 const char* class_name; /* Name of the class to which
319 the category belongs. */
320 MethodList_t instance_methods; /* Linked list of instance
321 methods defined in the
322 category. NULL indicates no
323 instance methods defined. */
324 MethodList_t class_methods; /* Linked list of factory
325 methods defined in the
326 category. NULL indicates no
327 class methods defined. */
328 struct objc_protocol_list *protocols; /* List of Protocols
330 } Category, *Category_t;
333 ** Structure used when a message is send to a class's super class. The
334 ** compiler generates one of these structures and passes it to
337 typedef struct objc_super {
338 id self; /* Id of the object sending
340 Class class; /* Object's super class. */
343 IMP objc_msg_lookup_super(Super_t super, SEL sel);
345 retval_t objc_msg_sendv(id, SEL, arglist_t);
350 ** This is a hook which is called by objc_lookup_class and
351 ** objc_get_class if the runtime is not able to find the class.
352 ** This may e.g. try to load in the class using dynamic loading.
353 ** The function is guaranteed to be passed a non-NULL name string.
355 extern Class (*_objc_lookup_class)(const char *name);
358 ** This is a hook which is called by __objc_exec_class every time a class
359 ** or a category is loaded into the runtime. This may e.g. help a
360 ** dynamic loader determine the classes that have been loaded when
361 ** an object file is dynamically linked in.
363 extern void (*_objc_load_callback)(Class class, Category* category);
366 ** Hook functions for allocating, copying and disposing of instances
368 extern id (*_objc_object_alloc)(Class class);
369 extern id (*_objc_object_copy)(id object);
370 extern id (*_objc_object_dispose)(id object);
373 ** Standard functions for memory allocation and disposal.
374 ** Users should use these functions in their ObjC programs so
375 ** that they work properly with garbage collectors as well as
376 ** can take advantage of the exception/error handling available.
379 objc_malloc(size_t size);
382 objc_atomic_malloc(size_t size);
385 objc_valloc(size_t size);
388 objc_realloc(void *mem, size_t size);
391 objc_calloc(size_t nelem, size_t size);
394 objc_free(void *mem);
397 ** Hook functions for memory allocation and disposal.
398 ** This makes it easy to substitute garbage collection systems
399 ** such as Boehm's GC by assigning these function pointers
400 ** to the GC's allocation routines. By default these point
401 ** to the ANSI standard malloc, realloc, free, etc.
403 ** Users should call the normal objc routines above for
404 ** memory allocation and disposal within their programs.
406 extern void *(*_objc_malloc)(size_t);
407 extern void *(*_objc_atomic_malloc)(size_t);
408 extern void *(*_objc_valloc)(size_t);
409 extern void *(*_objc_realloc)(void *, size_t);
410 extern void *(*_objc_calloc)(size_t, size_t);
411 extern void (*_objc_free)(void *);
413 Method_t class_get_class_method(MetaClass class, SEL aSel);
415 Method_t class_get_instance_method(Class class, SEL aSel);
417 Class class_pose_as(Class impostor, Class superclass);
419 Class objc_get_class(const char *name);
421 Class objc_lookup_class(const char *name);
423 Class objc_next_class(void **enum_state);
425 const char *sel_get_name(SEL selector);
427 const char *sel_get_type(SEL selector);
429 SEL sel_get_uid(const char *name);
431 SEL sel_get_any_uid(const char *name);
433 SEL sel_get_any_typed_uid(const char *name);
435 SEL sel_get_typed_uid(const char *name, const char*);
437 SEL sel_register_name(const char *name);
439 SEL sel_register_typed_name(const char *name, const char*type);
442 BOOL sel_is_mapped (SEL aSel);
444 extern id class_create_instance(Class class);
446 /* You should call this function immediately after a bundle has loaded the
447 code. This function sends the +load message to all classes/categories
448 just loaded and then calls the _objc_load_callback function for each
450 extern void objc_send_load (void);
452 static inline const char *
453 class_get_class_name(Class class)
455 return CLS_ISCLASS(class)?class->name:((class==Nil)?"Nil":0);
459 class_get_instance_size(Class class)
461 return CLS_ISCLASS(class)?class->instance_size:0;
464 static inline MetaClass
465 class_get_meta_class(Class class)
467 return CLS_ISCLASS(class)?class->class_pointer:Nil;
471 class_get_super_class(Class class)
473 return CLS_ISCLASS(class)?class->super_class:Nil;
477 class_get_version(Class class)
479 return CLS_ISCLASS(class)?class->version:-1;
483 class_is_class(Class class)
485 return CLS_ISCLASS(class);
489 class_is_meta_class(Class class)
491 return CLS_ISMETA(class);
496 class_set_version(Class class, long version)
498 if (CLS_ISCLASS(class))
499 class->version = version;
503 method_get_imp(Method_t method)
505 return (method!=METHOD_NULL)?method->method_imp:(IMP)0;
508 IMP get_imp (Class class, SEL sel);
510 id object_copy(id object);
512 id object_dispose(id object);
515 object_get_class(id object)
517 return ((object!=nil)
518 ? (CLS_ISCLASS(object->class_pointer)
519 ? object->class_pointer
520 : (CLS_ISMETA(object->class_pointer)
526 static inline const char *
527 object_get_class_name(id object)
529 return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
530 ?object->class_pointer->name
531 :((Class)object)->name)
535 static inline MetaClass
536 object_get_meta_class(id object)
538 return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
539 ?object->class_pointer->class_pointer
540 :(CLS_ISMETA(object->class_pointer)
541 ?object->class_pointer
547 object_get_super_class
550 return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
551 ?object->class_pointer->super_class
552 :(CLS_ISMETA(object->class_pointer)
553 ?((Class)object)->super_class
559 object_is_class(id object)
561 return CLS_ISCLASS((Class)object);
565 object_is_instance(id object)
567 return (object!=nil)&&CLS_ISCLASS(object->class_pointer);
571 object_is_meta_class(id object)
573 return CLS_ISMETA((Class)object);
577 objc_get_uninstalled_dtable();
579 #endif /* not __objc_api_INCLUDE_GNU */