libobjc/objc/objc-api.h

/* GNU Objective-C Runtime API - Traditional API
   Copyright (C) 1993, 1995, 1996, 1997, 2001, 2002, 2003, 2004, 2005,
   2007, 2009, 2010 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 3, 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#ifndef __objc_api_INCLUDE_GNU
#define __objc_api_INCLUDE_GNU

/* This file declares the "traditional" GNU Objective-C Runtime API.
   It is the API supported by older versions of the GNU Objective-C
   Runtime.  Include this file to use it.

   This API is being replaced by the "modern" GNU Objective-C Runtime
   API, which is declared in objc/runtime.h.  The "modern" API is very
   similar to the API used by the modern Apple/NeXT runtime.

   The last version of GCC supporting the traditional API is GCC 4.6.
   This file will not exist in later versions of GCC.

   Because the two APIs have some conflicting definitions (in
   particular, Method and Category are defined differently) you should
   include either objc/objc-api.h (to use the traditional GNU
   Objective-C Runtime API) or objc/runtime.h (to use the modern GNU
   Objective-C Runtime API), but not both.  */
#ifdef __objc_runtime_INCLUDE_GNU
# error You can not include both objc/objc-api.h and objc/runtime.h.  Include objc/objc-api.h for the traditional GNU Objective-C Runtime API and objc/runtime.h for the modern one.
#endif

/* TODO: A deprecation warning any time the file is included ? */

#include "objc.h"
#ifndef GNU_LIBOBJC_COMPILING_LIBOBJC_ITSELF
# include "deprecated/hash.h"
#endif
#include "thr.h"
#include "objc-decls.h"
#include <stdio.h>
#include <stdarg.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include "deprecated/METHOD_NULL.h"

/* Method descriptor returned by introspective Object methods.
   This is really just the first part of the more complete objc_method
   structure defined below and used internally by the runtime.  */
struct objc_method_description
{
    SEL name;			/* this is a selector, not a string */
    char *types;		/* type encoding */
};

/* The following are used in encode strings to describe the type of
   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_LNG_LNG  'q'
#define _C_ULNG_LNG 'Q'
#define _C_FLT      'f'
#define _C_DBL      'd'
#define _C_LNG_DBL  'D'
#define _C_BFLD     'b'
#define _C_BOOL     '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 '}'
#define _C_VECTOR   '!'
#define _C_COMPLEX  'j'

/* _C_ATOM is never generated by the compiler.  You can treat it as
   equivalent to "*".  */
#define _C_ATOM     '%'

#include "deprecated/objc_error.h"

#include "deprecated/struct_objc_static_instances.h"
#include "deprecated/struct_objc_symtab.h"
#include "deprecated/struct_objc_module.h"
#include "deprecated/struct_objc_ivar.h"
#include "deprecated/struct_objc_ivar_list.h"
#include "deprecated/struct_objc_method.h"
typedef struct objc_method Method, *Method_t;

#include "deprecated/struct_objc_method_list.h"
#include "deprecated/struct_objc_protocol_list.h"

/*
** This is used to assure consistent access to the info field of 
** classes
*/
#ifndef HOST_BITS_PER_LONG
#define HOST_BITS_PER_LONG  (sizeof(long)*8)
#endif 

#define __CLS_INFO(cls) ((cls)->info)
#define __CLS_ISINFO(cls, mask) ((__CLS_INFO(cls)&mask)==mask)
#define __CLS_SETINFO(cls, mask) (__CLS_INFO(cls) |= mask)

/* The structure is of type MetaClass */
#define _CLS_META 0x2L
#define CLS_ISMETA(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_META))


/* The structure is of type Class */
#define _CLS_CLASS 0x1L
#define CLS_ISCLASS(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_CLASS))

/*
** The class is initialized within the runtime.  This means that 
** it has had correct super and sublinks assigned
*/
#define _CLS_RESOLV 0x8L
#define CLS_ISRESOLV(cls) __CLS_ISINFO(cls, _CLS_RESOLV)
#define CLS_SETRESOLV(cls) __CLS_SETINFO(cls, _CLS_RESOLV)

/*
** The class has been send a +initialize message or a such is not 
** defined for this class
*/
#define _CLS_INITIALIZED 0x04L
#define CLS_ISINITIALIZED(cls) __CLS_ISINFO(cls, _CLS_INITIALIZED)
#define CLS_SETINITIALIZED(cls) __CLS_SETINFO(cls, _CLS_INITIALIZED)

/*
** The class number of this class.  This must be the same for both the 
** class and its meta class object
*/
#define CLS_GETNUMBER(cls) (__CLS_INFO(cls) >> (HOST_BITS_PER_LONG/2))
#define CLS_SETNUMBER(cls, num) \
  ({ (cls)->info <<= (HOST_BITS_PER_LONG/2); \
     (cls)->info >>= (HOST_BITS_PER_LONG/2); \
     __CLS_SETINFO(cls, (((unsigned long)num) << (HOST_BITS_PER_LONG/2))); })

#include "deprecated/struct_objc_category.h"

typedef struct objc_category Category, *Category_t;

/* We include message.h for compatibility with the old objc-api.h
   which included the declarations currently in message.h.  The
   Apple/NeXT runtime does not do this and only includes message.h in
   objc-runtime.h.  It does not matter that much since most of the
   definitions in message.h are runtime-specific.  */
#include "message.h"

/*
** This is a hook which is called by objc_lookup_class and
** objc_get_class if the runtime is not able to find the class.
** This may e.g. try to load in the class using dynamic loading.
** The function is guaranteed to be passed a non-NULL name string.
** In the Modern API, this is replaced by
** objc_setGetUnknownClassHandler ().
*/
objc_EXPORT Class (*_objc_lookup_class)(const char *name);

/*
** This is a hook which is called by __objc_exec_class every time a class
** or a category is loaded into the runtime.  This may e.g. help a
** dynamic loader determine the classes that have been loaded when
** an object file is dynamically linked in.
*/
objc_EXPORT void (*_objc_load_callback)(Class _class, Category* category);

#include "deprecated/objc_object_alloc.h"

/*
  Standard functions for memory allocation and disposal.  Users should
  use these functions in their ObjC programs so that they work so that
  they work properly with garbage collectors.
*/
objc_EXPORT void *
objc_malloc(size_t size);

/* FIXME: Shouldn't the following be called objc_malloc_atomic ?  The
   GC function is GC_malloc_atomic() which makes sense.
 */
objc_EXPORT void *
objc_atomic_malloc(size_t size);

objc_EXPORT void *
objc_realloc(void *mem, size_t size);

objc_EXPORT void *
objc_calloc(size_t nelem, size_t size);

objc_EXPORT void
objc_free(void *mem);

#include "deprecated/objc_valloc.h"
#include "deprecated/objc_malloc.h"

#include "deprecated/objc_unexpected_exception.h"

objc_EXPORT Method_t class_get_class_method(MetaClass _class, SEL aSel);

objc_EXPORT Method_t class_get_instance_method(Class _class, SEL aSel);

objc_EXPORT Class class_pose_as(Class impostor, Class superclass);

objc_EXPORT Class objc_get_class(const char *name);

objc_EXPORT Class objc_lookup_class(const char *name);

objc_EXPORT Class objc_next_class(void **enum_state);

objc_EXPORT const char *sel_get_name(SEL selector);

objc_EXPORT const char *sel_get_type(SEL selector);

objc_EXPORT SEL sel_get_uid(const char *name);

objc_EXPORT SEL sel_get_any_uid(const char *name);

objc_EXPORT SEL sel_get_any_typed_uid(const char *name);

objc_EXPORT SEL sel_get_typed_uid(const char *name, const char*);

objc_EXPORT SEL sel_register_name(const char *name);

objc_EXPORT SEL sel_register_typed_name(const char *name, const char*type);


objc_EXPORT BOOL sel_is_mapped (SEL aSel);

extern id class_create_instance(Class _class);

static inline const char *
class_get_class_name(Class _class)
{
  return CLS_ISCLASS(_class)?_class->name:((_class==Nil)?"Nil":0);
}

static inline long
class_get_instance_size(Class _class)
{
  return CLS_ISCLASS(_class)?_class->instance_size:0;
}

static inline MetaClass
class_get_meta_class(Class _class)
{
  return CLS_ISCLASS(_class)?_class->class_pointer:Nil;
}

static inline Class
class_get_super_class(Class _class)
{
  return CLS_ISCLASS(_class)?_class->super_class:Nil;
}

static inline int
class_get_version(Class _class)
{
  return CLS_ISCLASS(_class)?_class->version:-1;
}

static inline BOOL
class_is_class(Class _class)
{
  return CLS_ISCLASS(_class);
}

static inline BOOL
class_is_meta_class(Class _class)
{
  return CLS_ISMETA(_class);
}


static inline void
class_set_version(Class _class, long version)
{
  if (CLS_ISCLASS(_class))
    _class->version = version;
}

static inline void *
class_get_gc_object_type (Class _class)
{
  return CLS_ISCLASS(_class) ? _class->gc_object_type : NULL;
}

/* Mark the instance variable as innaccessible to the garbage collector */
extern void class_ivar_set_gcinvisible (Class _class,
					const char* ivarname,
					BOOL gcInvisible);

objc_EXPORT IMP method_get_imp(Method_t method);

objc_EXPORT IMP get_imp (Class _class, SEL sel);

/* object_copy used to take a single argument in the traditional GNU
   Objective-C Runtime API (the one declared here), but takes 2 in the
   modern API (implemented in the actual runtime).  Define the old
   object_copy in terms of the new one.  */
objc_EXPORT id object_copy (id object, size_t size);
#define object_copy(X) (object_copy ((X), 0))

objc_EXPORT id object_dispose(id object);

static inline Class
object_get_class(id object)
{
  return ((object!=nil)
	  ? (CLS_ISCLASS(object->class_pointer)
	     ? object->class_pointer
	     : (CLS_ISMETA(object->class_pointer)
		? (Class)object
		: Nil))
	  : Nil);
}

static inline const char *
object_get_class_name(id object)
{
  return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
                         ?object->class_pointer->name
                         :((Class)object)->name)
                       :"Nil");
}

static inline MetaClass
object_get_meta_class(id object)
{
  return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
                         ?object->class_pointer->class_pointer
                         :(CLS_ISMETA(object->class_pointer)
                           ?object->class_pointer
                           :Nil))
                       :Nil);
}

static inline Class
object_get_super_class
(id object)
{
  return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
                         ?object->class_pointer->super_class
                         :(CLS_ISMETA(object->class_pointer)
                           ?((Class)object)->super_class
                           :Nil))
                       :Nil);
}

static inline BOOL
object_is_class (id object)
{
  return ((object != nil)  &&  CLS_ISMETA (object->class_pointer));
}
 
static inline BOOL
object_is_instance (id object)
{
  return ((object != nil)  &&  CLS_ISCLASS (object->class_pointer));
}

static inline BOOL
object_is_meta_class (id object)
{
  return ((object != nil)
	  &&  !object_is_instance (object)  
	  &&  !object_is_class (object));
}

#include "deprecated/objc_get_uninstalled_dtable.h"

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* not __objc_api_INCLUDE_GNU */