runtime/objc-config.h

   1 /*
   2  * Copyright (c) 1999-2002, 2005-2008 Apple Inc.  All Rights Reserved.
   3  *
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   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,
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  18  * Please see the License for the specific language governing rights and
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  23
  24 #ifndef _OBJC_CONFIG_H_
  25 #define _OBJC_CONFIG_H_
  26
  27 #include <TargetConditionals.h>
  28
  29 // Define SUPPORT_GC=1 to enable garbage collection.
  30 // Be sure to edit OBJC_NO_GC in objc-auto.h as well.
  31 #if TARGET_OS_EMBEDDED  ||  TARGET_OS_IPHONE  ||  TARGET_OS_WIN32
  32 #   define SUPPORT_GC 0
  33 #else
  34 #   define SUPPORT_GC 1
  35 #endif
  36
  37 // Define SUPPORT_ENVIRON=1 to enable getenv().
  38 #if ((TARGET_OS_EMBEDDED  ||  TARGET_OS_IPHONE)  &&  !TARGET_IPHONE_SIMULATOR)  &&  defined(NDEBUG)
  39 #   define SUPPORT_ENVIRON 0
  40 #else
  41 #   define SUPPORT_ENVIRON 1
  42 #endif
  43
  44 // Define SUPPORT_ZONES=1 to enable malloc zone support in NXHashTable.
  45 #if TARGET_OS_EMBEDDED  ||  TARGET_OS_IPHONE
  46 #   define SUPPORT_ZONES 0
  47 #else
  48 #   define SUPPORT_ZONES 1
  49 #endif
  50
  51 // Define SUPPORT_MOD=1 to use the mod operator in NXHashTable and objc-sel-set
  52 #if defined(__arm__)
  53 #   define SUPPORT_MOD 0
  54 #else
  55 #   define SUPPORT_MOD 1
  56 #endif
  57
  58 // Define SUPPORT_PREOPT=1 to enable dyld shared cache optimizations
  59 #if TARGET_OS_WIN32  ||  TARGET_IPHONE_SIMULATOR
  60 #   define SUPPORT_PREOPT 0
  61 #else
  62 #   define SUPPORT_PREOPT 1
  63 #endif
  64
  65 // Define SUPPORT_DEBUGGER_MODE=1 to enable lock-avoiding execution for debuggers
  66 #if TARGET_OS_WIN32
  67 #   define SUPPORT_DEBUGGER_MODE 0
  68 #else
  69 #   define SUPPORT_DEBUGGER_MODE 1
  70 #endif
  71
  72 // Define SUPPORT_TAGGED_POINTERS=1 to enable tagged pointer objects
  73 // Be sure to edit objc-internal.h as well (_objc_insert_tagged_isa)
  74 #if !(__OBJC2__  &&  __LP64__)
  75 #   define SUPPORT_TAGGED_POINTERS 0
  76 #else
  77 #   define SUPPORT_TAGGED_POINTERS 1
  78 #endif
  79
  80 // Define SUPPORT_FIXUP=1 to use call-site fixup messaging for OBJC2.
  81 // Be sure to edit objc-abi.h as well (objc_msgSend*_fixup)
  82 #if !__OBJC2__  ||  !defined(__x86_64__)
  83 #   define SUPPORT_FIXUP 0
  84 #else
  85 #   define SUPPORT_FIXUP 1
  86 #endif
  87
  88 // Define SUPPORT_VTABLE=1 to enable vtable dispatch for OBJC2.
  89 // Be sure to edit objc-gdb.h as well (gdb_objc_trampolines)
  90 #if !SUPPORT_FIXUP
  91 #   define SUPPORT_VTABLE 0
  92 #else
  93 #   define SUPPORT_VTABLE 1
  94 #endif
  95
  96 // Define SUPPORT_IGNORED_SELECTOR_CONSTANT to remap GC-ignored selectors.
  97 // Good: fast ignore in objc_msgSend. Bad: disable shared cache optimizations
  98 // Non-GC does not remap. Fixup dispatch does not remap.
  99 #if !SUPPORT_GC  ||  SUPPORT_FIXUP
 100 #   define SUPPORT_IGNORED_SELECTOR_CONSTANT 0
 101 #else
 102 #   define SUPPORT_IGNORED_SELECTOR_CONSTANT 1
 103 #   if defined(__i386__)
 104 #       define kIgnore 0xfffeb010
 105 #   else
 106 #       error unknown architecture
 107 #   endif
 108 #endif
 109
 110 // Define SUPPORT_ZEROCOST_EXCEPTIONS to use "zero-cost" exceptions for OBJC2.
 111 // Be sure to edit objc-exception.h as well (objc_add/removeExceptionHandler)
 112 #if !__OBJC2__  ||  defined(__arm__)
 113 #   define SUPPORT_ZEROCOST_EXCEPTIONS 0
 114 #else
 115 #   define SUPPORT_ZEROCOST_EXCEPTIONS 1
 116 #endif
 117
 118 // Define SUPPORT_ALT_HANDLERS if you're using zero-cost exceptions
 119 // but also need to support AppKit's alt-handler scheme
 120 // Be sure to edit objc-exception.h as well (objc_add/removeExceptionHandler)
 121 #if !SUPPORT_ZEROCOST_EXCEPTIONS  ||  TARGET_OS_IPHONE  ||  TARGET_OS_EMBEDDED
 122 #   define SUPPORT_ALT_HANDLERS 0
 123 #else
 124 #   define SUPPORT_ALT_HANDLERS 1
 125 #endif
 126
 127 // Define SUPPORT_RETURN_AUTORELEASE to optimize autoreleased return values
 128 #if !__OBJC2__  ||  TARGET_OS_WIN32
 129 #   define SUPPORT_RETURN_AUTORELEASE 0
 130 #else
 131 #   define SUPPORT_RETURN_AUTORELEASE 1
 132 #endif
 133
 134
 135 // OBJC_INSTRUMENTED controls whether message dispatching is dynamically
 136 // monitored.  Monitoring introduces substantial overhead.
 137 // NOTE: To define this condition, do so in the build command, NOT by
 138 // uncommenting the line here.  This is because objc-class.h heeds this
 139 // condition, but objc-class.h can not #include this file (objc-config.h)
 140 // because objc-class.h is public and objc-config.h is not.
 141 //#define OBJC_INSTRUMENTED
 142
 143 #endif