runtime/objc-runtime-old.h

   1 /*
   2  * Copyright (c) 1999-2007 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_RUNTIME_OLD_H
  25 #define _OBJC_RUNTIME_OLD_H
  26
  27 #include "objc-private.h"
  28
  29 #define CLS_CLASS               0x1
  30 #define CLS_META                0x2
  31 #define CLS_INITIALIZED         0x4
  32 #define CLS_POSING              0x8
  33 #define CLS_MAPPED              0x10
  34 #define CLS_FLUSH_CACHE         0x20
  35 #define CLS_GROW_CACHE          0x40
  36 #define CLS_NEED_BIND           0x80
  37 #define CLS_METHOD_ARRAY        0x100
  38 // the JavaBridge constructs classes with these markers
  39 #define CLS_JAVA_HYBRID         0x200
  40 #define CLS_JAVA_CLASS          0x400
  41 // thread-safe +initialize
  42 #define CLS_INITIALIZING        0x800
  43 // bundle unloading
  44 #define CLS_FROM_BUNDLE         0x1000
  45 // C++ ivar support
  46 #define CLS_HAS_CXX_STRUCTORS   0x2000
  47 // Lazy method list arrays
  48 #define CLS_NO_METHOD_ARRAY     0x4000
  49 // +load implementation
  50 #define CLS_HAS_LOAD_METHOD     0x8000
  51 // objc_allocateClassPair API
  52 #define CLS_CONSTRUCTING        0x10000
  53 // visibility=hidden
  54 #define CLS_HIDDEN              0x20000
  55 // GC:  class has unsafe finalize method
  56 #define CLS_FINALIZE_ON_MAIN_THREAD 0x40000
  57 // Lazy property list arrays
  58 #define CLS_NO_PROPERTY_ARRAY   0x80000
  59 // +load implementation
  60 #define CLS_CONNECTED           0x100000
  61 #define CLS_LOADED              0x200000
  62 // objc_allocateClassPair API
  63 #define CLS_CONSTRUCTED         0x400000
  64 // class is leaf for cache flushing
  65 #define CLS_LEAF                0x800000
  66 // class instances may have associative references
  67 #define CLS_INSTANCES_HAVE_ASSOCIATED_OBJECTS 0x1000000
  68 // class has instance-specific GC layout
  69 #define CLS_HAS_INSTANCE_SPECIFIC_LAYOUT 0x2000000
  70
  71
  72 // Terminator for array of method lists
  73 #define END_OF_METHODS_LIST ((struct old_method_list*)-1)
  74
  75 #define ISCLASS(cls)            (((cls)->info & CLS_CLASS) != 0)
  76 #define ISMETA(cls)             (((cls)->info & CLS_META) != 0)
  77 #define GETMETA(cls)            (ISMETA(cls) ? (cls) : (cls)->ISA())
  78
  79
  80 struct objc_class : objc_object {
  81     Class superclass;
  82     const char *name;
  83     uint32_t version;
  84     uint32_t info;
  85     uint32_t instance_size;
  86     struct old_ivar_list *ivars;
  87     struct old_method_list **methodLists;
  88     Cache cache;
  89     struct old_protocol_list *protocols;
  90     // CLS_EXT only
  91     const uint8_t *ivar_layout;
  92     struct old_class_ext *ext;
  93
  94     void setInfo(uint32_t set) {
  95         OSAtomicOr32Barrier(set, (volatile uint32_t *)&info);
  96     }
  97
  98     void clearInfo(uint32_t clear) {
  99         OSAtomicXor32Barrier(clear, (volatile uint32_t *)&info);
 100     }
 101
 102
 103     // set and clear must not overlap
 104     void changeInfo(uint32_t set, uint32_t clear) {
 105         assert((set & clear) == 0);
 106
 107         uint32_t oldf, newf;
 108         do {
 109             oldf = this->info;
 110             newf = (oldf | set) & ~clear;
 111         } while (!OSAtomicCompareAndSwap32Barrier(oldf, newf, (volatile int32_t *)&info));
 112     }
 113
 114     bool hasCxxCtor() {
 115         // set_superclass propagates the flag from the superclass.
 116         return info & CLS_HAS_CXX_STRUCTORS;
 117     }
 118
 119     bool hasCxxDtor() {
 120         return hasCxxCtor();  // one bit for both ctor and dtor
 121     }
 122
 123     bool instancesHaveAssociatedObjects() {
 124         return info & CLS_INSTANCES_HAVE_ASSOCIATED_OBJECTS;
 125     }
 126
 127     void setInstancesHaveAssociatedObjects() {
 128         setInfo(CLS_INSTANCES_HAVE_ASSOCIATED_OBJECTS);
 129     }
 130
 131     bool shouldGrowCache() {
 132         return info & CLS_GROW_CACHE;
 133     }
 134
 135     void setShouldGrowCache(bool grow) {
 136         if (grow) setInfo(CLS_GROW_CACHE);
 137         else clearInfo(CLS_GROW_CACHE);
 138     }
 139
 140     bool shouldFinalizeOnMainThread() {
 141         return info & CLS_FINALIZE_ON_MAIN_THREAD;
 142     }
 143
 144     void setShouldFinalizeOnMainThread() {
 145         setInfo(CLS_FINALIZE_ON_MAIN_THREAD);
 146     }
 147
 148     // +initialize bits are stored on the metaclass only
 149     bool isInitializing() {
 150         return getMeta()->info & CLS_INITIALIZING;
 151     }
 152
 153     // +initialize bits are stored on the metaclass only
 154     void setInitializing() {
 155         getMeta()->setInfo(CLS_INITIALIZING);
 156     }
 157
 158     // +initialize bits are stored on the metaclass only
 159     bool isInitialized() {
 160         return getMeta()->info & CLS_INITIALIZED;
 161     }
 162
 163     // +initialize bits are stored on the metaclass only
 164     void setInitialized() {
 165         getMeta()->changeInfo(CLS_INITIALIZED, CLS_INITIALIZING);
 166     }
 167
 168     bool isLoadable() {
 169         // A class registered for +load is ready for +load to be called
 170         // if it is connected.
 171         return isConnected();
 172     }
 173
 174     IMP getLoadMethod();
 175
 176     bool isConnected();
 177
 178     const char *getName() { return name; }
 179
 180     bool isMetaClass() {
 181         return info & CLS_META;
 182     }
 183
 184     // NOT identical to this->ISA() when this is a metaclass
 185     Class getMeta() {
 186         if (isMetaClass()) return (Class)this;
 187         else return this->ISA();
 188     }
 189
 190     // May be unaligned depending on class's ivars.
 191     uint32_t unalignedInstanceSize() {
 192         return instance_size;
 193     }
 194
 195     // Class's ivar size rounded up to a pointer-size boundary.
 196     uint32_t alignedInstanceSize() {
 197         return (unalignedInstanceSize() + WORD_MASK) & ~WORD_MASK;
 198     }
 199
 200 };
 201
 202 struct old_class_ext {
 203     uint32_t size;
 204     const uint8_t *weak_ivar_layout;
 205     struct old_property_list **propertyLists;
 206 };
 207
 208 struct old_category {
 209     char *category_name;
 210     char *class_name;
 211     struct old_method_list *instance_methods;
 212     struct old_method_list *class_methods;
 213     struct old_protocol_list *protocols;
 214     uint32_t size;
 215     struct old_property_list *instance_properties;
 216 };
 217
 218 struct old_ivar {
 219     char *ivar_name;
 220     char *ivar_type;
 221     int ivar_offset;
 222 #ifdef __LP64__
 223     int space;
 224 #endif
 225 };
 226
 227 struct old_ivar_list {
 228     int ivar_count;
 229 #ifdef __LP64__
 230     int space;
 231 #endif
 232     /* variable length structure */
 233     struct old_ivar ivar_list[1];
 234 };
 235
 236
 237 struct old_method {
 238     SEL method_name;
 239     char *method_types;
 240     IMP method_imp;
 241 };
 242
 243 struct old_method_list {
 244     void *obsolete;
 245
 246     int method_count;
 247 #ifdef __LP64__
 248     int space;
 249 #endif
 250     /* variable length structure */
 251     struct old_method method_list[1];
 252 };
 253
 254 struct old_protocol {
 255     Class isa;
 256     const char *protocol_name;
 257     struct old_protocol_list *protocol_list;
 258     struct objc_method_description_list *instance_methods;
 259     struct objc_method_description_list *class_methods;
 260 };
 261
 262 struct old_protocol_list {
 263     struct old_protocol_list *next;
 264     long count;
 265     struct old_protocol *list[1];
 266 };
 267
 268 struct old_protocol_ext {
 269     uint32_t size;
 270     struct objc_method_description_list *optional_instance_methods;
 271     struct objc_method_description_list *optional_class_methods;
 272     struct old_property_list *instance_properties;
 273     const char **extendedMethodTypes;
 274 };
 275
 276
 277 struct old_property {
 278     const char *name;
 279     const char *attributes;
 280 };
 281
 282 struct old_property_list {
 283     uint32_t entsize;
 284     uint32_t count;
 285     struct old_property first;
 286 };
 287
 288
 289 #include "hashtable2.h"
 290
 291 __BEGIN_DECLS
 292
 293 #define oldprotocol(proto) ((struct old_protocol *)proto)
 294 #define oldmethod(meth) ((struct old_method *)meth)
 295 #define oldcategory(cat) ((struct old_category *)cat)
 296 #define oldivar(ivar) ((struct old_ivar *)ivar)
 297 #define oldproperty(prop) ((struct old_property *)prop)
 298
 299 extern NXHashTable *class_hash;
 300
 301 extern void unload_class(Class cls);
 302
 303 extern IMP lookupNamedMethodInMethodList(struct old_method_list *mlist, const char *meth_name);
 304 extern void _objc_insertMethods(Class cls, struct old_method_list *mlist, struct old_category *cat);
 305 extern void _objc_removeMethods(Class cls, struct old_method_list *mlist);
 306 extern void _objc_flush_caches (Class cls);
 307 extern BOOL _class_addProperties(Class cls, struct old_property_list *additions);
 308 extern BOOL _class_hasLoadMethod(Class cls);
 309 extern void change_class_references(Class imposter, Class original, Class copy, BOOL changeSuperRefs);
 310 extern void flush_marked_caches(void);
 311 extern void set_superclass(Class cls, Class supercls, BOOL cls_is_new);
 312 extern void try_free(const void *p);
 313
 314 extern struct old_property *property_list_nth(const struct old_property_list *plist, uint32_t i);
 315 extern struct old_property **copyPropertyList(struct old_property_list *plist, unsigned int *outCount);
 316
 317 extern struct objc_method_description * lookup_protocol_method(struct old_protocol *proto, SEL aSel, BOOL isRequiredMethod, BOOL isInstanceMethod, BOOL recursive);
 318
 319 // used by flush_caches outside objc-cache.m
 320 extern void _cache_flush(Class cls);
 321 #ifdef OBJC_INSTRUMENTED
 322 extern unsigned int LinearFlushCachesCount;
 323 extern unsigned int LinearFlushCachesVisitedCount;
 324 extern unsigned int MaxLinearFlushCachesVisitedCount;
 325 extern unsigned int NonlinearFlushCachesCount;
 326 extern unsigned int NonlinearFlushCachesClassCount;
 327 extern unsigned int NonlinearFlushCachesVisitedCount;
 328 extern unsigned int MaxNonlinearFlushCachesVisitedCount;
 329 extern unsigned int IdealFlushCachesCount;
 330 extern unsigned int MaxIdealFlushCachesCount;
 331 #endif
 332
 333 __END_DECLS
 334
 335 #endif