1 /* GNU Objective-C Runtime API.
2 Copyright (C) 1993, 1995, 1996, 1997, 2002, 2004 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC 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 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 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 GCC; 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"
33 #include "objc/objc-decls.h"
37 /* For functions which return Method_t */
38 #define METHOD_NULL (Method_t)0
39 /* Boolean typedefs */
41 ** Method descriptor returned by introspective Object methods.
42 ** This is really just the first part of the more complete objc_method
43 ** structure defined below and used internally by the runtime.
45 struct objc_method_description
47 SEL name; /* this is a selector, not a string */
48 char *types; /* type encoding */
51 /* Filer types used to describe Ivars and Methods. */
63 #define _C_LNG_LNG 'q'
64 #define _C_ULNG_LNG 'Q'
71 #define _C_CHARPTR '*'
75 #define _C_UNION_B '('
76 #define _C_UNION_E ')'
77 #define _C_STRUCT_B '{'
78 #define _C_STRUCT_E '}'
85 ** Call objc_error() or objc_verror() to record an error; this error
86 ** routine will generally exit the program but not necessarily if the
87 ** user has installed his own error handler.
89 ** Call objc_set_error_handler to assign your own function for
90 ** handling errors. The function should return YES if it is ok
91 ** to continue execution, or return NO or just abort if the
92 ** program should be stopped. The default error handler is just to
93 ** print a message on stderr.
95 ** The error handler function should be of type objc_error_handler
96 ** The first parameter is an object instance of relevance.
97 ** The second parameter is an error code.
98 ** The third parameter is a format string in the printf style.
99 ** The fourth parameter is a variable list of arguments.
101 extern void objc_error(id object, int code, const char* fmt, ...);
102 extern void objc_verror(id object, int code, const char* fmt, va_list ap);
103 typedef BOOL (*objc_error_handler)(id, int code, const char *fmt, va_list ap);
104 extern objc_error_handler objc_set_error_handler(objc_error_handler func);
108 ** These are used by the runtime library, and your
109 ** error handling may use them to determine if the error is
110 ** hard or soft thus whether execution can continue or abort.
112 #define OBJC_ERR_UNKNOWN 0 /* Generic error */
114 #define OBJC_ERR_OBJC_VERSION 1 /* Incorrect runtime version */
115 #define OBJC_ERR_GCC_VERSION 2 /* Incorrect compiler version */
116 #define OBJC_ERR_MODULE_SIZE 3 /* Bad module size */
117 #define OBJC_ERR_PROTOCOL_VERSION 4 /* Incorrect protocol version */
119 #define OBJC_ERR_MEMORY 10 /* Out of memory */
121 #define OBJC_ERR_RECURSE_ROOT 20 /* Attempt to archive the root
122 object more than once. */
123 #define OBJC_ERR_BAD_DATA 21 /* Didn't read expected data */
124 #define OBJC_ERR_BAD_KEY 22 /* Bad key for object */
125 #define OBJC_ERR_BAD_CLASS 23 /* Unknown class */
126 #define OBJC_ERR_BAD_TYPE 24 /* Bad type specification */
127 #define OBJC_ERR_NO_READ 25 /* Cannot read stream */
128 #define OBJC_ERR_NO_WRITE 26 /* Cannot write stream */
129 #define OBJC_ERR_STREAM_VERSION 27 /* Incorrect stream version */
130 #define OBJC_ERR_BAD_OPCODE 28 /* Bad opcode */
132 #define OBJC_ERR_UNIMPLEMENTED 30 /* Method is not implemented */
134 #define OBJC_ERR_BAD_STATE 40 /* Bad thread state */
137 ** Set this variable nonzero to print a line describing each
138 ** message that is sent. (this is currently disabled)
140 extern BOOL objc_trace;
143 /* For every class which happens to have statically allocated instances in
144 this module, one OBJC_STATIC_INSTANCES is allocated by the compiler.
145 INSTANCES is NULL terminated and points to all statically allocated
146 instances of this class. */
147 struct objc_static_instances
154 ** Whereas a Module (defined further down) is the root (typically) of a file,
155 ** a Symtab is the root of the class and category definitions within the
158 ** A Symtab contains a variable length array of pointers to classes and
159 ** categories defined in the module.
161 typedef struct objc_symtab {
162 unsigned long sel_ref_cnt; /* Unknown. */
163 SEL refs; /* Unknown. */
164 unsigned short cls_def_cnt; /* Number of classes compiled
165 (defined) in the module. */
166 unsigned short cat_def_cnt; /* Number of categories
167 compiled (defined) in the
170 void *defs[1]; /* Variable array of pointers.
171 cls_def_cnt of type Class
172 followed by cat_def_cnt of
173 type Category_t, followed
174 by a NULL terminated array
175 of objc_static_instances. */
180 ** The compiler generates one of these structures for each module that
181 ** composes the executable (eg main.m).
183 ** This data structure is the root of the definition tree for the module.
185 ** A collect program runs between ld stages and creates a ObjC ctor array.
186 ** That array holds a pointer to each module structure of the executable.
188 typedef struct objc_module {
189 unsigned long version; /* Compiler revision. */
190 unsigned long size; /* sizeof(Module). */
191 const char* name; /* Name of the file where the
192 module was generated. The
193 name includes the path. */
195 Symtab_t symtab; /* Pointer to the Symtab of
196 the module. The Symtab
199 the classes and categories
200 defined in the module. */
205 ** The compiler generates one of these structures for a class that has
206 ** instance variables defined in its specification.
208 typedef struct objc_ivar* Ivar_t;
209 typedef struct objc_ivar_list {
210 int ivar_count; /* Number of structures (Ivar)
211 contained in the list. One
212 structure per instance
213 variable defined in the
216 const char* ivar_name; /* Name of the instance
217 variable as entered in the
219 const char* ivar_type; /* Description of the Ivar's
222 int ivar_offset; /* Byte offset from the base
223 address of the instance
224 structure to the variable. */
226 } ivar_list[1]; /* Variable length
228 } IvarList, *IvarList_t;
232 ** The compiler generates one (or more) of these structures for a class that
233 ** has methods defined in its specification.
235 ** The implementation of a class can be broken into separate pieces in a file
236 ** and categories can break them across modules. To handle this problem is a
237 ** singly linked list of methods.
239 typedef struct objc_method Method;
240 typedef Method* Method_t;
241 typedef struct objc_method_list {
242 struct objc_method_list* method_next; /* This variable is used to link
243 a method list to another. It
244 is a singly linked list. */
245 int method_count; /* Number of methods defined in
248 SEL method_name; /* This variable is the method's
250 The unique integer passed to
251 objc_msg_send is a char* too.
252 It is compared against
253 method_name using strcmp. */
254 const char* method_types; /* Description of the method's
255 parameter list. Useful for
257 IMP method_imp; /* Address of the method in the
259 } method_list[1]; /* Variable length
261 } MethodList, *MethodList_t;
263 struct objc_protocol_list {
264 struct objc_protocol_list *next;
270 ** This is used to assure consistent access to the info field of
273 #ifndef HOST_BITS_PER_LONG
274 #define HOST_BITS_PER_LONG (sizeof(long)*8)
277 #define __CLS_INFO(cls) ((cls)->info)
278 #define __CLS_ISINFO(cls, mask) ((__CLS_INFO(cls)&mask)==mask)
279 #define __CLS_SETINFO(cls, mask) (__CLS_INFO(cls) |= mask)
281 /* The structure is of type MetaClass */
282 #define _CLS_META 0x2L
283 #define CLS_ISMETA(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_META))
286 /* The structure is of type Class */
287 #define _CLS_CLASS 0x1L
288 #define CLS_ISCLASS(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_CLASS))
291 ** The class is initialized within the runtime. This means that
292 ** it has had correct super and sublinks assigned
294 #define _CLS_RESOLV 0x8L
295 #define CLS_ISRESOLV(cls) __CLS_ISINFO(cls, _CLS_RESOLV)
296 #define CLS_SETRESOLV(cls) __CLS_SETINFO(cls, _CLS_RESOLV)
299 ** The class has been send a +initialize message or a such is not
300 ** defined for this class
302 #define _CLS_INITIALIZED 0x04L
303 #define CLS_ISINITIALIZED(cls) __CLS_ISINFO(cls, _CLS_INITIALIZED)
304 #define CLS_SETINITIALIZED(cls) __CLS_SETINFO(cls, _CLS_INITIALIZED)
307 ** The class number of this class. This must be the same for both the
308 ** class and its meta class object
310 #define CLS_GETNUMBER(cls) (__CLS_INFO(cls) >> (HOST_BITS_PER_LONG/2))
311 #define CLS_SETNUMBER(cls, num) \
312 ({ (cls)->info <<= (HOST_BITS_PER_LONG/2); \
313 (cls)->info >>= (HOST_BITS_PER_LONG/2); \
314 __CLS_SETINFO(cls, (((unsigned long)num) << (HOST_BITS_PER_LONG/2))); })
317 ** The compiler generates one of these structures for each category. A class
318 ** may have many categories and contain both instance and factory methods.
320 typedef struct objc_category {
321 const char* category_name; /* Name of the category. Name
322 contained in the () of the
323 category definition. */
324 const char* class_name; /* Name of the class to which
325 the category belongs. */
326 MethodList_t instance_methods; /* Linked list of instance
327 methods defined in the
328 category. NULL indicates no
329 instance methods defined. */
330 MethodList_t class_methods; /* Linked list of factory
331 methods defined in the
332 category. NULL indicates no
333 class methods defined. */
334 struct objc_protocol_list *protocols; /* List of Protocols
336 } Category, *Category_t;
339 ** Structure used when a message is send to a class's super class. The
340 ** compiler generates one of these structures and passes it to
343 typedef struct objc_super {
344 id self; /* Id of the object sending
349 Class class; /* Object's super class. */
353 IMP objc_msg_lookup_super(Super_t super, SEL sel);
355 retval_t objc_msg_sendv(id, SEL, arglist_t);
360 ** This is a hook which is called by objc_lookup_class and
361 ** objc_get_class if the runtime is not able to find the class.
362 ** This may e.g. try to load in the class using dynamic loading.
363 ** The function is guaranteed to be passed a non-NULL name string.
365 objc_EXPORT Class (*_objc_lookup_class)(const char *name);
368 ** This is a hook which is called by __objc_exec_class every time a class
369 ** or a category is loaded into the runtime. This may e.g. help a
370 ** dynamic loader determine the classes that have been loaded when
371 ** an object file is dynamically linked in.
373 objc_EXPORT void (*_objc_load_callback)(Class class, Category* category);
376 ** Hook functions for allocating, copying and disposing of instances
378 objc_EXPORT id (*_objc_object_alloc)(Class class);
379 objc_EXPORT id (*_objc_object_copy)(id object);
380 objc_EXPORT id (*_objc_object_dispose)(id object);
383 ** Standard functions for memory allocation and disposal.
384 ** Users should use these functions in their ObjC programs so
385 ** that they work properly with garbage collectors as well as
386 ** can take advantage of the exception/error handling available.
389 objc_malloc(size_t size);
392 objc_atomic_malloc(size_t size);
395 objc_valloc(size_t size);
398 objc_realloc(void *mem, size_t size);
401 objc_calloc(size_t nelem, size_t size);
404 objc_free(void *mem);
407 ** Hook functions for memory allocation and disposal.
408 ** This makes it easy to substitute garbage collection systems
409 ** such as Boehm's GC by assigning these function pointers
410 ** to the GC's allocation routines. By default these point
411 ** to the ANSI standard malloc, realloc, free, etc.
413 ** Users should call the normal objc routines above for
414 ** memory allocation and disposal within their programs.
416 objc_EXPORT void *(*_objc_malloc)(size_t);
417 objc_EXPORT void *(*_objc_atomic_malloc)(size_t);
418 objc_EXPORT void *(*_objc_valloc)(size_t);
419 objc_EXPORT void *(*_objc_realloc)(void *, size_t);
420 objc_EXPORT void *(*_objc_calloc)(size_t, size_t);
421 objc_EXPORT void (*_objc_free)(void *);
424 ** Hook for method forwarding. This makes it easy to substitute a
425 ** library, such as ffcall, that implements closures, thereby avoiding
426 ** gcc's __builtin_apply problems.
428 objc_EXPORT IMP (*__objc_msg_forward)(SEL);
430 Method_t class_get_class_method(MetaClass class, SEL aSel);
432 Method_t class_get_instance_method(Class class, SEL aSel);
434 Class class_pose_as(Class impostor, Class superclass);
436 Class objc_get_class(const char *name);
438 Class objc_lookup_class(const char *name);
440 Class objc_next_class(void **enum_state);
442 const char *sel_get_name(SEL selector);
444 const char *sel_get_type(SEL selector);
446 SEL sel_get_uid(const char *name);
448 SEL sel_get_any_uid(const char *name);
450 SEL sel_get_any_typed_uid(const char *name);
452 SEL sel_get_typed_uid(const char *name, const char*);
454 SEL sel_register_name(const char *name);
456 SEL sel_register_typed_name(const char *name, const char*type);
459 BOOL sel_is_mapped (SEL aSel);
461 extern id class_create_instance(Class class);
463 static inline const char *
464 class_get_class_name(Class class)
466 return CLS_ISCLASS(class)?class->name:((class==Nil)?"Nil":0);
470 class_get_instance_size(Class class)
472 return CLS_ISCLASS(class)?class->instance_size:0;
475 static inline MetaClass
476 class_get_meta_class(Class class)
478 return CLS_ISCLASS(class)?class->class_pointer:Nil;
482 class_get_super_class(Class class)
484 return CLS_ISCLASS(class)?class->super_class:Nil;
488 class_get_version(Class class)
490 return CLS_ISCLASS(class)?class->version:-1;
494 class_is_class(Class class)
496 return CLS_ISCLASS(class);
500 class_is_meta_class(Class class)
502 return CLS_ISMETA(class);
507 class_set_version(Class class, long version)
509 if (CLS_ISCLASS(class))
510 class->version = version;
514 class_get_gc_object_type (Class class)
516 return CLS_ISCLASS(class) ? class->gc_object_type : NULL;
519 /* Mark the instance variable as innaccessible to the garbage collector */
520 extern void class_ivar_set_gcinvisible (Class class,
521 const char* ivarname,
525 method_get_imp(Method_t method)
527 return (method!=METHOD_NULL)?method->method_imp:(IMP)0;
530 IMP get_imp (Class class, SEL sel);
532 /* Redefine on NeXTSTEP so as not to conflict with system function */
534 #define object_copy gnu_object_copy
535 #define object_dispose gnu_object_dispose
538 id object_copy(id object);
540 id object_dispose(id object);
543 object_get_class(id object)
545 return ((object!=nil)
546 ? (CLS_ISCLASS(object->class_pointer)
547 ? object->class_pointer
548 : (CLS_ISMETA(object->class_pointer)
554 static inline const char *
555 object_get_class_name(id object)
557 return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
558 ?object->class_pointer->name
559 :((Class)object)->name)
563 static inline MetaClass
564 object_get_meta_class(id object)
566 return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
567 ?object->class_pointer->class_pointer
568 :(CLS_ISMETA(object->class_pointer)
569 ?object->class_pointer
575 object_get_super_class
578 return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
579 ?object->class_pointer->super_class
580 :(CLS_ISMETA(object->class_pointer)
581 ?((Class)object)->super_class
587 object_is_class (id object)
589 return ((object != nil) && CLS_ISMETA (object->class_pointer));
593 object_is_instance (id object)
595 return ((object != nil) && CLS_ISCLASS (object->class_pointer));
599 object_is_meta_class (id object)
601 return ((object != nil)
602 && !object_is_instance (object)
603 && !object_is_class (object));
607 objc_get_uninstalled_dtable(void);
609 #endif /* not __objc_api_INCLUDE_GNU */