runtime/objc-config.h

   1 /*
   2  * Copyright (c) 1999-2002, 2005-2008 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
  24 #include <TargetConditionals.h>
  25
  26 // Define NO_GC to disable garbage collection.
  27 // Be sure to edit OBJC_NO_GC in objc-auto.h as well.
  28 #if TARGET_OS_EMBEDDED  ||  TARGET_OS_WIN32
  29 #   define NO_GC 1
  30 #endif
  31
  32 // Define NO_ENVIRON to disable getenv().
  33 #if TARGET_OS_EMBEDDED
  34 #   define NO_ENVIRON 1
  35 #endif
  36
  37 // Define NO_ZONES to disable malloc zone support in NXHashTable.
  38 #if TARGET_OS_EMBEDDED
  39 #   define NO_ZONES 1
  40 #endif
  41
  42 // Define NO_MOD to avoid the mod operator in NXHashTable and objc-sel-set.
  43 #if defined(__arm__)
  44 #   define NO_MOD 1
  45 #endif
  46
  47 // Define NO_BUILTINS to disable the builtin selector table from dyld
  48 #if TARGET_OS_WIN32
  49 #   define NO_BUILTINS 1
  50 #endif
  51
  52 // Define NO_DEBUGGER_MODE to disable lock-avoiding execution for debuggers
  53 #if TARGET_OS_WIN32
  54 #   define NO_DEBUGGER_MODE 1
  55 #endif
  56
  57 #if __OBJC2__
  58
  59 // Define NO_FIXUP to use non-fixup messaging for OBJC2.
  60 #if defined(__arm__)
  61 #   define NO_FIXUP 1
  62 #endif
  63
  64 // Define NO_VTABLE to disable vtable dispatch for OBJC2.
  65 #if defined(NO_FIXUP)  ||  defined(__ppc64__)
  66 #   define NO_VTABLE 1
  67 #endif
  68
  69 // Define NO_ZEROCOST_EXCEPTIONS to use sjlj exceptions for OBJC2.
  70 // Be sure to edit objc-exception.h as well (objc_add/removeExceptionHandler)
  71 #if defined(__arm__)
  72 #   define NO_ZEROCOST_EXCEPTIONS 1
  73 #endif
  74
  75 #endif
  76
  77
  78 // OBJC_INSTRUMENTED controls whether message dispatching is dynamically
  79 // monitored.  Monitoring introduces substantial overhead.
  80 // NOTE: To define this condition, do so in the build command, NOT by
  81 // uncommenting the line here.  This is because objc-class.h heeds this
  82 // condition, but objc-class.h can not #include this file (objc-config.h)
  83 // because objc-class.h is public and objc-config.h is not.
  84 //#define OBJC_INSTRUMENTED
  85
  86 // Get the nice macros for subroutine calling, etc.
  87 // Not available on all architectures.  Not needed
  88 // (by us) on some configurations.
  89 #if defined (__i386__) || defined (i386)
  90 #   include <architecture/i386/asm_help.h>
  91 #elif defined (__ppc__) || defined(ppc)
  92 #   include <architecture/ppc/asm_help.h>
  93 #endif