runtime/objc-auto.mm

   1 /*
   2  * Copyright (c) 2004-2007 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 #define OBJC_DECLARE_SYMBOLS 1
  25 #include "objc-private.h"
  26 #include "objc-auto.h"
  27
  28 // GC is no longer supported.
  29
  30 #if OBJC_NO_GC_API
  31
  32 // No GC and no GC symbols needed. We're done here.
  33 # if SUPPORT_GC_COMPAT
  34 #   error inconsistent config settings
  35 # endif
  36
  37 #else
  38
  39 // No GC but we do need to export GC symbols.
  40
  41 # if !SUPPORT_GC_COMPAT
  42 #   error inconsistent config settings
  43 # endif
  44
  45 void objc_collect(unsigned long options __unused) { }
  46 BOOL objc_collectingEnabled(void) { return NO; }
  47 void objc_setCollectionThreshold(size_t threshold __unused) { }
  48 void objc_setCollectionRatio(size_t ratio __unused) { }
  49 void objc_startCollectorThread(void) { }
  50
  51 #if TARGET_OS_WIN32
  52 BOOL objc_atomicCompareAndSwapPtr(id predicate, id replacement, volatile id *objectLocation)
  53     { void *original = InterlockedCompareExchangePointer((void * volatile *)objectLocation, (void *)replacement, (void *)predicate); return (original == predicate); }
  54
  55 BOOL objc_atomicCompareAndSwapPtrBarrier(id predicate, id replacement, volatile id *objectLocation)
  56     { void *original = InterlockedCompareExchangePointer((void * volatile *)objectLocation, (void *)replacement, (void *)predicate); return (original == predicate); }
  57 #else
  58 BOOL objc_atomicCompareAndSwapPtr(id predicate, id replacement, volatile id *objectLocation)
  59     { return OSAtomicCompareAndSwapPtr((void *)predicate, (void *)replacement, (void * volatile *)objectLocation); }
  60
  61 BOOL objc_atomicCompareAndSwapPtrBarrier(id predicate, id replacement, volatile id *objectLocation)
  62     { return OSAtomicCompareAndSwapPtrBarrier((void *)predicate, (void *)replacement, (void * volatile *)objectLocation); }
  63 #endif
  64
  65 BOOL objc_atomicCompareAndSwapGlobal(id predicate, id replacement, volatile id *objectLocation)
  66     { return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation); }
  67
  68 BOOL objc_atomicCompareAndSwapGlobalBarrier(id predicate, id replacement, volatile id *objectLocation)
  69     { return objc_atomicCompareAndSwapPtrBarrier(predicate, replacement, objectLocation); }
  70
  71 BOOL objc_atomicCompareAndSwapInstanceVariable(id predicate, id replacement, volatile id *objectLocation)
  72     { return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation); }
  73
  74 BOOL objc_atomicCompareAndSwapInstanceVariableBarrier(id predicate, id replacement, volatile id *objectLocation)
  75     { return objc_atomicCompareAndSwapPtrBarrier(predicate, replacement, objectLocation); }
  76
  77 id objc_assign_strongCast(id val, id *dest)
  78     { return (*dest = val); }
  79
  80 id objc_assign_global(id val, id *dest)
  81     { return (*dest = val); }
  82
  83 id objc_assign_threadlocal(id val, id *dest)
  84     { return (*dest = val); }
  85
  86 id objc_assign_ivar(id val, id dest, ptrdiff_t offset)
  87     { return (*(id*)((char *)dest+offset) = val); }
  88
  89 id objc_read_weak(id *location)
  90     { return *location; }
  91
  92 id objc_assign_weak(id value, id *location)
  93     { return (*location = value); }
  94
  95 void *objc_memmove_collectable(void *dst, const void *src, size_t size)
  96     { return memmove(dst, src, size); }
  97
  98 void objc_finalizeOnMainThread(Class cls __unused) { }
  99 BOOL objc_is_finalized(void *ptr __unused) { return NO; }
 100 void objc_clear_stack(unsigned long options __unused) { }
 101
 102 BOOL objc_collecting_enabled(void) { return NO; }
 103 void objc_set_collection_threshold(size_t threshold __unused) { }
 104 void objc_set_collection_ratio(size_t ratio __unused) { }
 105 void objc_start_collector_thread(void) { }
 106
 107 id objc_allocate_object(Class cls, int extra)
 108     { return class_createInstance(cls, extra); }
 109
 110 void objc_registerThreadWithCollector() { }
 111 void objc_unregisterThreadWithCollector() { }
 112 void objc_assertRegisteredThreadWithCollector() { }
 113
 114 malloc_zone_t* objc_collect_init(int(*callback)() __unused) { return nil; }
 115 malloc_zone_t* objc_collectableZone() { return nil; }
 116
 117 BOOL objc_isAuto(id object __unused) { return NO; }
 118 BOOL objc_dumpHeap(char *filename __unused, unsigned long length __unused)
 119     { return NO; }
 120
 121 // not OBJC_NO_GC_API
 122 #endif