runtime/objc-sel-old.mm

   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 /*
  25  *      Utilities for registering and looking up selectors.  The sole
  26  *      purpose of the selector tables is a registry whereby there is
  27  *      exactly one address (selector) associated with a given string
  28  *      (method name).
  29  */
  30
  31 #if !__OBJC2__
  32
  33 #include "objc-private.h"
  34 #include "objc-sel-set.h"
  35
  36 #if SUPPORT_PREOPT
  37 #include <objc-shared-cache.h>
  38 static const objc_selopt_t *builtins = NULL;
  39 #endif
  40
  41 __BEGIN_DECLS
  42
  43 static size_t SelrefCount = 0;
  44
  45 static const char *_objc_empty_selector = "";
  46 static struct __objc_sel_set *_objc_selectors = NULL;
  47
  48
  49 static SEL _objc_search_builtins(const char *key)
  50 {
  51 #if defined(DUMP_SELECTORS)
  52     if (NULL != key) printf("\t\"%s\",\n", key);
  53 #endif
  54
  55     if (!key) return (SEL)0;
  56 #if SUPPORT_IGNORED_SELECTOR_CONSTANT
  57     if ((uintptr_t)key == kIgnore) return (SEL)kIgnore;
  58     if (ignoreSelectorNamed(key)) return (SEL)kIgnore;
  59 #endif
  60     if ('\0' == *key) return (SEL)_objc_empty_selector;
  61
  62 #if SUPPORT_PREOPT
  63     if (builtins) return (SEL)builtins->get(key);
  64 #endif
  65
  66     return (SEL)0;
  67 }
  68
  69
  70 const char *sel_getName(SEL sel) {
  71 #if SUPPORT_IGNORED_SELECTOR_CONSTANT
  72     if ((uintptr_t)sel == kIgnore) return "<ignored selector>";
  73 #endif
  74     return sel ? (const char *)sel : "<null selector>";
  75 }
  76
  77
  78 BOOL sel_isMapped(SEL name)
  79 {
  80     SEL result;
  81
  82     if (!name) return NO;
  83 #if SUPPORT_IGNORED_SELECTOR_CONSTANT
  84     if ((uintptr_t)name == kIgnore) return YES;
  85 #endif
  86
  87     result = _objc_search_builtins((const char *)name);
  88     if (result) return YES;
  89
  90     rwlock_read(&selLock);
  91     if (_objc_selectors) {
  92         result = __objc_sel_set_get(_objc_selectors, name);
  93     }
  94     rwlock_unlock_read(&selLock);
  95     return result ? YES : NO;
  96 }
  97
  98 static SEL __sel_registerName(const char *name, int lock, int copy)
  99 {
 100     SEL result = 0;
 101
 102     if (lock) rwlock_assert_unlocked(&selLock);
 103     else rwlock_assert_writing(&selLock);
 104
 105     if (!name) return (SEL)0;
 106     result = _objc_search_builtins(name);
 107     if (result) return result;
 108
 109     if (lock) rwlock_read(&selLock);
 110     if (_objc_selectors) {
 111         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
 112     }
 113     if (lock) rwlock_unlock_read(&selLock);
 114     if (result) return result;
 115
 116     // No match. Insert.
 117
 118     if (lock) rwlock_write(&selLock);
 119
 120     if (!_objc_selectors) {
 121         _objc_selectors = __objc_sel_set_create(SelrefCount);
 122     }
 123     if (lock) {
 124         // Rescan in case it was added while we dropped the lock
 125         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
 126     }
 127     if (!result) {
 128         result = (SEL)(copy ? _strdup_internal(name) : name);
 129         __objc_sel_set_add(_objc_selectors, result);
 130 #if defined(DUMP_UNKNOWN_SELECTORS)
 131         printf("\t\"%s\",\n", name);
 132 #endif
 133     }
 134
 135     if (lock) rwlock_unlock_write(&selLock);
 136     return result;
 137 }
 138
 139
 140 SEL sel_registerName(const char *name) {
 141     return __sel_registerName(name, 1, 1);     // YES lock, YES copy
 142 }
 143
 144 SEL sel_registerNameNoLock(const char *name, BOOL copy) {
 145     return __sel_registerName(name, 0, copy);  // NO lock, maybe copy
 146 }
 147
 148 void sel_lock(void)
 149 {
 150     rwlock_write(&selLock);
 151 }
 152
 153 void sel_unlock(void)
 154 {
 155     rwlock_unlock_write(&selLock);
 156 }
 157
 158
 159 // 2001/1/24
 160 // the majority of uses of this function (which used to return NULL if not found)
 161 // did not check for NULL, so, in fact, never return NULL
 162 //
 163 SEL sel_getUid(const char *name) {
 164     return __sel_registerName(name, 2, 1);  // YES lock, YES copy
 165 }
 166
 167
 168 BOOL sel_isEqual(SEL lhs, SEL rhs)
 169 {
 170     return (lhs == rhs) ? YES : NO;
 171 }
 172
 173
 174 /***********************************************************************
 175 * sel_preoptimizationValid
 176 * Return YES if this image's selector fixups are valid courtesy
 177 * of the dyld shared cache.
 178 **********************************************************************/
 179 BOOL sel_preoptimizationValid(const header_info *hi)
 180 {
 181 #if !SUPPORT_PREOPT
 182
 183     return NO;
 184
 185 #else
 186
 187 # if SUPPORT_IGNORED_SELECTOR_CONSTANT
 188     // shared cache can't fix constant ignored selectors
 189     if (UseGC) return NO;
 190 # endif
 191
 192     // preoptimization disabled for some reason
 193     if (!isPreoptimized()) return NO;
 194
 195     // image not from shared cache, or not fixed inside shared cache
 196     if (!_objcHeaderOptimizedByDyld(hi)) return NO;
 197
 198     return YES;
 199
 200 #endif
 201 }
 202
 203
 204 /***********************************************************************
 205 * sel_init
 206 * Initialize selector tables and register selectors used internally.
 207 **********************************************************************/
 208 void sel_init(BOOL wantsGC, size_t selrefCount)
 209 {
 210     // save this value for later
 211     SelrefCount = selrefCount;
 212
 213 #if SUPPORT_PREOPT
 214     builtins = preoptimizedSelectors();
 215 #endif
 216
 217     // Register selectors used by libobjc
 218
 219     if (wantsGC) {
 220         // Registering retain/release/autorelease requires GC decision first.
 221         // sel_init doesn't actually need the wantsGC parameter, it just
 222         // helps enforce the initialization order.
 223     }
 224
 225 #define s(x) SEL_##x = sel_registerNameNoLock(#x, NO)
 226 #define t(x,y) SEL_##y = sel_registerNameNoLock(#x, NO)
 227
 228     sel_lock();
 229
 230     s(load);
 231     s(initialize);
 232     t(resolveInstanceMethod:, resolveInstanceMethod);
 233     t(resolveClassMethod:, resolveClassMethod);
 234     t(.cxx_construct, cxx_construct);
 235     t(.cxx_destruct, cxx_destruct);
 236     s(retain);
 237     s(release);
 238     s(autorelease);
 239     s(retainCount);
 240     s(alloc);
 241     t(allocWithZone:, allocWithZone);
 242     s(dealloc);
 243     s(copy);
 244     s(new);
 245     s(finalize);
 246     t(forwardInvocation:, forwardInvocation);
 247     t(_tryRetain, tryRetain);
 248     t(_isDeallocating, isDeallocating);
 249     s(retainWeakReference);
 250     s(allowsWeakReference);
 251
 252     extern SEL FwdSel;
 253     FwdSel = sel_registerNameNoLock("forward::", NO);
 254
 255     sel_unlock();
 256
 257 #undef s
 258 #undef t
 259 }
 260
 261 __END_DECLS
 262
 263 #endif