runtime/objc-auto.h

   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 #ifndef _OBJC_AUTO_H_
  25 #define _OBJC_AUTO_H_
  26
  27 #include <objc/objc.h>
  28 #include <malloc/malloc.h>
  29 #include <stdint.h>
  30 #include <stddef.h>
  31 #include <string.h>
  32 #include <Availability.h>
  33 #include <TargetConditionals.h>
  34
  35 #include <sys/types.h>
  36 #include <libkern/OSAtomic.h>
  37
  38
  39 // Define OBJC_SILENCE_GC_DEPRECATIONS=1 to temporarily
  40 // silence deprecation warnings for GC functions.
  41
  42 #if OBJC_SILENCE_GC_DEPRECATIONS
  43 #   define OBJC_GC_DEPRECATED(message)
  44 #elif __has_extension(attribute_deprecated_with_message)
  45 #   define OBJC_GC_DEPRECATED(message) __attribute__((deprecated(message ". Define OBJC_SILENCE_GC_DEPRECATIONS=1 to temporarily silence this diagnostic.")))
  46 #else
  47 #   define OBJC_GC_DEPRECATED(message) __attribute__((deprecated))
  48 #endif
  49
  50
  51 enum {
  52     OBJC_RATIO_COLLECTION        = (0 << 0),
  53     OBJC_GENERATIONAL_COLLECTION = (1 << 0),
  54     OBJC_FULL_COLLECTION         = (2 << 0),
  55     OBJC_EXHAUSTIVE_COLLECTION   = (3 << 0),
  56
  57     OBJC_COLLECT_IF_NEEDED       = (1 << 3),
  58     OBJC_WAIT_UNTIL_DONE         = (1 << 4)
  59 };
  60
  61 enum {
  62     OBJC_CLEAR_RESIDENT_STACK = (1 << 0)
  63 };
  64
  65
  66 #if !defined(OBJC_NO_GC)  ||  \
  67     (OBJC_DECLARE_SYMBOLS && !defined(OBJC_NO_GC_API))
  68
  69
  70 /* Out-of-line declarations */
  71
  72 OBJC_EXPORT void objc_collect(unsigned long options)
  73     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "it does nothing");
  74 OBJC_EXPORT BOOL objc_collectingEnabled(void)
  75     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.8, "it always returns NO");
  76 OBJC_EXPORT malloc_zone_t *objc_collectableZone(void)
  77     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.7, 10.8, "it always returns nil");
  78 OBJC_EXPORT void objc_setCollectionThreshold(size_t threshold)
  79     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.8, "it does nothing");
  80 OBJC_EXPORT void objc_setCollectionRatio(size_t ratio)
  81     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.8, "it does nothing");
  82 OBJC_EXPORT BOOL objc_atomicCompareAndSwapPtr(id predicate, id replacement, volatile id *objectLocation)
  83     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "use OSAtomicCompareAndSwapPtr instead");
  84 OBJC_EXPORT BOOL objc_atomicCompareAndSwapPtrBarrier(id predicate, id replacement, volatile id *objectLocation)
  85     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "use OSAtomicCompareAndSwapPtrBarrier instead");
  86 OBJC_EXPORT BOOL objc_atomicCompareAndSwapGlobal(id predicate, id replacement, volatile id *objectLocation)
  87     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "use OSAtomicCompareAndSwapPtr instead");
  88 OBJC_EXPORT BOOL objc_atomicCompareAndSwapGlobalBarrier(id predicate, id replacement, volatile id *objectLocation)
  89     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "use OSAtomicCompareAndSwapPtrBarrier instead");
  90 OBJC_EXPORT BOOL objc_atomicCompareAndSwapInstanceVariable(id predicate, id replacement, volatile id *objectLocation)
  91     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "use OSAtomicCompareAndSwapPtr instead");
  92 OBJC_EXPORT BOOL objc_atomicCompareAndSwapInstanceVariableBarrier(id predicate, id replacement, volatile id *objectLocation)
  93     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "use OSAtomicCompareAndSwapPtrBarrier instead");
  94 OBJC_EXPORT id objc_assign_strongCast(id val, id *dest)
  95     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.8, "use a simple assignment instead");
  96 OBJC_EXPORT id objc_assign_global(id val, id *dest)
  97     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.8, "use a simple assignment instead");
  98 OBJC_EXPORT id objc_assign_threadlocal(id val, id *dest)
  99     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.7, 10.8, "use a simple assignment instead");
 100 OBJC_EXPORT id objc_assign_ivar(id value, id dest, ptrdiff_t offset)
 101     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.8, "use a simple assignment instead");
 102 OBJC_EXPORT void *objc_memmove_collectable(void *dst, const void *src, size_t size)
 103     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.8, "use memmove instead");
 104 OBJC_EXPORT id objc_read_weak(id *location)
 105     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.8, "use a simple read instead, or convert to zeroing __weak");
 106 OBJC_EXPORT id objc_assign_weak(id value, id *location)
 107     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.8, "use a simple assignment instead, or convert to zeroing __weak");
 108 OBJC_EXPORT void objc_registerThreadWithCollector(void)
 109     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "it does nothing");
 110 OBJC_EXPORT void objc_unregisterThreadWithCollector(void)
 111     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "it does nothing");
 112 OBJC_EXPORT void objc_assertRegisteredThreadWithCollector(void)
 113     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.6, 10.8, "it does nothing");
 114 OBJC_EXPORT void objc_clear_stack(unsigned long options)
 115     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.8, "it does nothing");
 116 OBJC_EXPORT BOOL objc_is_finalized(void *ptr)
 117     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.8, "it always returns NO");
 118 OBJC_EXPORT void objc_finalizeOnMainThread(Class cls)
 119     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.5, "it does nothing");
 120 OBJC_EXPORT BOOL objc_collecting_enabled(void)
 121     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.5, "it always returns NO");
 122 OBJC_EXPORT void objc_set_collection_threshold(size_t threshold)
 123     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.5, "it does nothing");
 124 OBJC_EXPORT void objc_set_collection_ratio(size_t ratio)
 125     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.5, "it does nothing");
 126 OBJC_EXPORT void objc_start_collector_thread(void)
 127     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.5, "it does nothing");
 128 OBJC_EXPORT void objc_startCollectorThread(void)
 129     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.5, 10.7, "it does nothing");
 130 OBJC_EXPORT id objc_allocate_object(Class cls, int extra)
 131     OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.4, 10.4, "use class_createInstance instead");
 132
 133
 134 /* !defined(OBJC_NO_GC) */
 135 #else
 136 /* defined(OBJC_NO_GC) */
 137
 138
 139 /* Inline declarations */
 140
 141 OBJC_GC_DEPRECATED("it does nothing")
 142 static OBJC_INLINE void objc_collect(unsigned long options __unused) { }
 143 OBJC_GC_DEPRECATED("it always returns NO")
 144 static OBJC_INLINE BOOL objc_collectingEnabled(void) { return NO; }
 145 #if TARGET_OS_OSX
 146 OBJC_GC_DEPRECATED("it always returns nil")
 147 static OBJC_INLINE malloc_zone_t *objc_collectableZone(void) { return nil; }
 148 #endif
 149 OBJC_GC_DEPRECATED("it does nothing")
 150 static OBJC_INLINE void objc_setCollectionThreshold(size_t threshold __unused) { }
 151 OBJC_GC_DEPRECATED("it does nothing")
 152 static OBJC_INLINE void objc_setCollectionRatio(size_t ratio __unused) { }
 153 OBJC_GC_DEPRECATED("it does nothing")
 154 static OBJC_INLINE void objc_startCollectorThread(void) { }
 155
 156 #if __has_feature(objc_arc)
 157
 158 /* Covers for GC memory operations are unavailable in ARC */
 159
 160 #else
 161
 162 OBJC_GC_DEPRECATED("use OSAtomicCompareAndSwapPtr instead")
 163 static OBJC_INLINE BOOL objc_atomicCompareAndSwapPtr(id predicate, id replacement, volatile id *objectLocation)
 164     { return OSAtomicCompareAndSwapPtr((void *)predicate, (void *)replacement, (void * volatile *)objectLocation); }
 165
 166 OBJC_GC_DEPRECATED("use OSAtomicCompareAndSwapPtrBarrier instead")
 167 static OBJC_INLINE BOOL objc_atomicCompareAndSwapPtrBarrier(id predicate, id replacement, volatile id *objectLocation)
 168     { return OSAtomicCompareAndSwapPtrBarrier((void *)predicate, (void *)replacement, (void * volatile *)objectLocation); }
 169
 170 OBJC_GC_DEPRECATED("use OSAtomicCompareAndSwapPtr instead")
 171 static OBJC_INLINE BOOL objc_atomicCompareAndSwapGlobal(id predicate, id replacement, volatile id *objectLocation)
 172     { return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation); }
 173
 174 OBJC_GC_DEPRECATED("use OSAtomicCompareAndSwapPtrBarrier instead")
 175 static OBJC_INLINE BOOL objc_atomicCompareAndSwapGlobalBarrier(id predicate, id replacement, volatile id *objectLocation)
 176     { return objc_atomicCompareAndSwapPtrBarrier(predicate, replacement, objectLocation); }
 177
 178 OBJC_GC_DEPRECATED("use OSAtomicCompareAndSwapPtr instead")
 179 static OBJC_INLINE BOOL objc_atomicCompareAndSwapInstanceVariable(id predicate, id replacement, volatile id *objectLocation)
 180     { return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation); }
 181
 182 OBJC_GC_DEPRECATED("use OSAtomicCompareAndSwapPtrBarrier instead")
 183 static OBJC_INLINE BOOL objc_atomicCompareAndSwapInstanceVariableBarrier(id predicate, id replacement, volatile id *objectLocation)
 184     { return objc_atomicCompareAndSwapPtrBarrier(predicate, replacement, objectLocation); }
 185
 186
 187 OBJC_GC_DEPRECATED("use a simple assignment instead")
 188 static OBJC_INLINE id objc_assign_strongCast(id val, id *dest)
 189     { return (*dest = val); }
 190
 191 OBJC_GC_DEPRECATED("use a simple assignment instead")
 192 static OBJC_INLINE id objc_assign_global(id val, id *dest)
 193     { return (*dest = val); }
 194
 195 OBJC_GC_DEPRECATED("use a simple assignment instead")
 196 static OBJC_INLINE id objc_assign_threadlocal(id val, id *dest)
 197     { return (*dest = val); }
 198
 199 OBJC_GC_DEPRECATED("use a simple assignment instead")
 200 static OBJC_INLINE id objc_assign_ivar(id val, id dest, ptrdiff_t offset)
 201     { return (*(id*)((intptr_t)(char *)dest+offset) = val); }
 202
 203 OBJC_GC_DEPRECATED("use a simple read instead, or convert to zeroing __weak")
 204 static OBJC_INLINE id objc_read_weak(id *location)
 205     { return *location; }
 206
 207 OBJC_GC_DEPRECATED("use a simple assignment instead, or convert to zeroing __weak")
 208 static OBJC_INLINE id objc_assign_weak(id value, id *location)
 209     { return (*location = value); }
 210
 211 /* MRC */
 212 #endif
 213
 214 OBJC_GC_DEPRECATED("use memmove instead")
 215 static OBJC_INLINE void *objc_memmove_collectable(void *dst, const void *src, size_t size)
 216     { return memmove(dst, src, size); }
 217
 218 OBJC_GC_DEPRECATED("it does nothing")
 219 static OBJC_INLINE void objc_finalizeOnMainThread(Class cls __unused) { }
 220 OBJC_GC_DEPRECATED("it always returns NO")
 221 static OBJC_INLINE BOOL objc_is_finalized(void *ptr __unused) { return NO; }
 222 OBJC_GC_DEPRECATED("it does nothing")
 223 static OBJC_INLINE void objc_clear_stack(unsigned long options __unused) { }
 224 OBJC_GC_DEPRECATED("it always returns NO")
 225 static OBJC_INLINE BOOL objc_collecting_enabled(void) { return NO; }
 226 OBJC_GC_DEPRECATED("it does nothing")
 227 static OBJC_INLINE void objc_set_collection_threshold(size_t threshold __unused) { }
 228 OBJC_GC_DEPRECATED("it does nothing")
 229 static OBJC_INLINE void objc_set_collection_ratio(size_t ratio __unused) { }
 230 OBJC_GC_DEPRECATED("it does nothing")
 231 static OBJC_INLINE void objc_start_collector_thread(void) { }
 232
 233 #if __has_feature(objc_arc)
 234 extern id objc_allocate_object(Class cls, int extra) UNAVAILABLE_ATTRIBUTE;
 235 #else
 236 OBJC_EXPORT id class_createInstance(Class cls, size_t extraBytes)
 237     OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
 238 OBJC_GC_DEPRECATED("use class_createInstance instead")
 239 static OBJC_INLINE id objc_allocate_object(Class cls, int extra)
 240     { return class_createInstance(cls, (size_t)extra); }
 241 #endif
 242
 243 OBJC_GC_DEPRECATED("it does nothing")
 244 static OBJC_INLINE void objc_registerThreadWithCollector() { }
 245 OBJC_GC_DEPRECATED("it does nothing")
 246 static OBJC_INLINE void objc_unregisterThreadWithCollector() { }
 247 OBJC_GC_DEPRECATED("it does nothing")
 248 static OBJC_INLINE void objc_assertRegisteredThreadWithCollector() { }
 249
 250 /* defined(OBJC_NO_GC) */
 251 #endif
 252
 253
 254 #endif