libobjc/objc/objc.h

   1 /* Basic data types for Objective C.
   2    Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  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.  */
  20
  21 /* As a special exception, if you link this library with files
  22    compiled with GCC to produce an executable, this does not cause
  23    the resulting executable to be covered by the GNU General Public License.
  24    This exception does not however invalidate any other reasons why
  25    the executable file might be covered by the GNU General Public License.  */
  26
  27 #ifndef __objc_INCLUDE_GNU
  28 #define __objc_INCLUDE_GNU
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 #include <stddef.h>
  35
  36 /*
  37 ** Definition of the boolean type.
  38 */
  39 #ifdef __vxworks
  40 typedef int BOOL;
  41 #else
  42 typedef unsigned char  BOOL;
  43 #endif
  44 #define YES   (BOOL)1
  45 #define NO    (BOOL)0
  46
  47 /*
  48 ** Definition of a selector.  Selectors themselves are not unique, but
  49 ** the sel_id is a unique identifier.
  50 */
  51 typedef const struct objc_selector
  52 {
  53   void *sel_id;
  54   const char *sel_types;
  55 } *SEL;
  56
  57 inline static BOOL
  58 sel_eq (SEL s1, SEL s2)
  59 {
  60   if (s1 == 0 || s2 == 0)
  61     return s1 == s2;
  62   else
  63     return s1->sel_id == s2->sel_id;
  64 }
  65
  66
  67 /*
  68 ** ObjC uses this typedef for untyped instances.
  69 */
  70 typedef struct objc_object {
  71   struct objc_class*  class_pointer;
  72 } *id;
  73
  74 /*
  75 ** Definition of method type.  When retrieving the implementation of a
  76 ** method, this is type of the pointer returned
  77 */
  78 typedef id (*IMP)(id, SEL, ...);
  79
  80 /*
  81 ** More simple types...
  82 */
  83 #define nil (id)0                               /* id of Nil instance */
  84 #define Nil (Class)0                            /* id of Nil class */
  85 typedef char *STR;                              /* String alias */
  86
  87 /*
  88 ** The compiler generates one of these structures for each class.
  89 **
  90 ** This structure is the definition for classes.
  91 **
  92 ** This structure is generated by the compiler in the executable and used by
  93 ** the run-time during normal messaging operations.  Therefore some members
  94 ** change type. The compiler generates "char* const" and places a string in
  95 ** the following member variables:  super_class.
  96 */
  97 typedef struct objc_class *MetaClass;
  98 typedef struct objc_class *Class;
  99 struct objc_class {
 100   MetaClass           class_pointer;          /* Pointer to the class's
 101                                                 meta class. */
 102   struct objc_class*  super_class;            /* Pointer to the super
 103                                                 class. NULL for class
 104                                                 Object. */
 105   const char*         name;                   /* Name of the class. */
 106   long                version;                /* Unknown. */
 107   unsigned long       info;                   /* Bit mask.  See class masks
 108                                                 defined above. */
 109   long                instance_size;          /* Size in bytes of the class.
 110                                                 The sum of the class
 111                                                 definition and all super
 112                                                 class definitions. */
 113   struct objc_ivar_list* ivars;               /* Pointer to a structure that
 114                                                 describes the instance
 115                                                 variables in the class
 116                                                 definition.  NULL indicates
 117                                                 no instance variables.  Does
 118                                                 not include super class
 119                                                 variables. */
 120   struct objc_method_list*  methods;          /* Linked list of instance
 121                                                 methods defined for the
 122                                                 class. */
 123   struct sarray *    dtable;                  /* Pointer to instance
 124                                                  method dispatch table. */
 125   struct objc_class* subclass_list;           /* Subclasses */
 126   struct objc_class* sibling_class;
 127
 128   struct objc_protocol_list *protocols;       /* Protocols conformed to */
 129   void* gc_object_type;
 130 };
 131
 132 #ifndef __OBJC__
 133 typedef struct objc_protocol {
 134   struct objc_class* class_pointer;
 135   char *protocol_name;
 136   struct objc_protocol_list *protocol_list;
 137   struct objc_method_description_list *instance_methods, *class_methods;
 138 } Protocol;
 139
 140 #else /* __OBJC__ */
 141 @class Protocol;
 142 #endif
 143
 144 typedef void* retval_t;         /* return value */
 145 typedef void(*apply_t)(void);   /* function pointer */
 146 typedef union {
 147   char *arg_ptr;
 148   char arg_regs[sizeof (char*)];
 149 } *arglist_t;                   /* argument frame */
 150
 151
 152 IMP objc_msg_lookup(id receiver, SEL op);
 153
 154 #ifdef __cplusplus
 155 }
 156 #endif
 157
 158 #endif /* not __objc_INCLUDE_GNU */