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