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/* 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

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 */