runtime/objc-api.h

   1 /*
   2  * Copyright (c) 1999-2006 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 // Copyright 1988-1996 NeXT Software, Inc.
  24
  25 #ifndef _OBJC_OBJC_API_H_
  26 #define _OBJC_OBJC_API_H_
  27
  28 #include <Availability.h>
  29 #include <AvailabilityMacros.h>
  30 #include <TargetConditionals.h>
  31
  32 #ifndef __has_feature
  33 #   define __has_feature(x) 0
  34 #endif
  35
  36 #ifndef __has_extension
  37 #   define __has_extension __has_feature
  38 #endif
  39
  40 #ifndef __has_attribute
  41 #   define __has_attribute(x) 0
  42 #endif
  43
  44
  45 /*
  46  * OBJC_API_VERSION 0 or undef: Tiger and earlier API only
  47  * OBJC_API_VERSION 2: Leopard and later API available
  48  */
  49 #if !defined(OBJC_API_VERSION)
  50 #   if defined(__MAC_OS_X_VERSION_MIN_REQUIRED)  &&  __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_5
  51 #       define OBJC_API_VERSION 0
  52 #   else
  53 #       define OBJC_API_VERSION 2
  54 #   endif
  55 #endif
  56
  57
  58 /* OBJC_OLD_DISPATCH_PROTOTYPES == 0 enforces the rule that the dispatch
  59  * functions must be cast to an appropriate function pointer type. */
  60 #if !defined(OBJC_OLD_DISPATCH_PROTOTYPES)
  61 #   define OBJC_OLD_DISPATCH_PROTOTYPES 1
  62 #endif
  63
  64
  65 /* OBJC_ISA_AVAILABILITY: `isa` will be deprecated or unavailable
  66  * in the future */
  67 #if !defined(OBJC_ISA_AVAILABILITY)
  68 #   define OBJC_ISA_AVAILABILITY  /* still available */
  69 #endif
  70
  71
  72 /* OBJC2_UNAVAILABLE: unavailable in objc 2.0, deprecated in Leopard */
  73 #if !defined(OBJC2_UNAVAILABLE)
  74 #   if __OBJC2__
  75 #       define OBJC2_UNAVAILABLE UNAVAILABLE_ATTRIBUTE
  76 #   else
  77         /* plain C code also falls here, but this is close enough */
  78 #       define OBJC2_UNAVAILABLE __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5,__MAC_10_5, __IPHONE_2_0,__IPHONE_2_0)
  79 #   endif
  80 #endif
  81
  82 /* OBJC_ARC_UNAVAILABLE: unavailable with -fobjc-arc */
  83 #if !defined(OBJC_ARC_UNAVAILABLE)
  84 #   if __has_feature(objc_arc)
  85 #       if __has_extension(attribute_unavailable_with_message)
  86 #           define OBJC_ARC_UNAVAILABLE __attribute__((unavailable("not available in automatic reference counting mode")))
  87 #       else
  88 #           define OBJC_ARC_UNAVAILABLE __attribute__((unavailable))
  89 #       endif
  90 #   else
  91 #       define OBJC_ARC_UNAVAILABLE
  92 #   endif
  93 #endif
  94
  95 /* OBJC_GC_UNAVAILABLE: unavailable with -fobjc-gc or -fobjc-gc-only */
  96 #if !defined(OBJC_GC_UNAVAILABLE)
  97 #   if __OBJC_GC__
  98 #       if __has_extension(attribute_unavailable_with_message)
  99 #           define OBJC_GC_UNAVAILABLE __attribute__((unavailable("not available in garbage collecting mode")))
 100 #       else
 101 #           define OBJC_GC_UNAVAILABLE __attribute__((unavailable))
 102 #       endif
 103 #   else
 104 #       define OBJC_GC_UNAVAILABLE
 105 #   endif
 106 #endif
 107
 108 #if !defined(OBJC_EXTERN)
 109 #   if defined(__cplusplus)
 110 #       define OBJC_EXTERN extern "C"
 111 #   else
 112 #       define OBJC_EXTERN extern
 113 #   endif
 114 #endif
 115
 116 #if !defined(OBJC_VISIBLE)
 117 #   if TARGET_OS_WIN32
 118 #       if defined(BUILDING_OBJC)
 119 #           define OBJC_VISIBLE __declspec(dllexport)
 120 #       else
 121 #           define OBJC_VISIBLE __declspec(dllimport)
 122 #       endif
 123 #   else
 124 #       define OBJC_VISIBLE  __attribute__((visibility("default")))
 125 #   endif
 126 #endif
 127
 128 #if !defined(OBJC_EXPORT)
 129 #   define OBJC_EXPORT  OBJC_EXTERN OBJC_VISIBLE
 130 #endif
 131
 132 #if !defined(OBJC_IMPORT)
 133 #   define OBJC_IMPORT extern
 134 #endif
 135
 136 #if !defined(OBJC_ROOT_CLASS)
 137 #   if __has_attribute(objc_root_class)
 138 #       define OBJC_ROOT_CLASS __attribute__((objc_root_class))
 139 #   else
 140 #       define OBJC_ROOT_CLASS
 141 #   endif
 142 #endif
 143
 144 #ifndef __DARWIN_NULL
 145 #define __DARWIN_NULL NULL
 146 #endif
 147
 148 #if !defined(OBJC_INLINE)
 149 #   define OBJC_INLINE __inline
 150 #endif
 151
 152 #endif