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 ('\0' == *key) return (SEL)_objc_empty_selector;
  57
  58 #if SUPPORT_PREOPT
  59     if (builtins) return (SEL)builtins->get(key);
  60 #endif
  61
  62     return (SEL)0;
  63 }
  64
  65
  66 const char *sel_getName(SEL sel) {
  67     return sel ? (const char *)sel : "<null selector>";
  68 }
  69
  70
  71 BOOL sel_isMapped(SEL name)
  72 {
  73     SEL sel;
  74
  75     if (!name) return NO;
  76
  77     sel = _objc_search_builtins((const char *)name);
  78     if (sel) return YES;
  79
  80     rwlock_reader_t lock(selLock);
  81     if (_objc_selectors) {
  82         sel = __objc_sel_set_get(_objc_selectors, name);
  83     }
  84     return bool(sel);
  85 }
  86
  87 static SEL __sel_registerName(const char *name, int lock, int copy)
  88 {
  89     SEL result = 0;
  90
  91     if (lock) selLock.assertUnlocked();
  92     else selLock.assertWriting();
  93
  94     if (!name) return (SEL)0;
  95     result = _objc_search_builtins(name);
  96     if (result) return result;
  97
  98     if (lock) selLock.read();
  99     if (_objc_selectors) {
 100         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
 101     }
 102     if (lock) selLock.unlockRead();
 103     if (result) return result;
 104
 105     // No match. Insert.
 106
 107     if (lock) selLock.write();
 108
 109     if (!_objc_selectors) {
 110         _objc_selectors = __objc_sel_set_create(SelrefCount);
 111     }
 112     if (lock) {
 113         // Rescan in case it was added while we dropped the lock
 114         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
 115     }
 116     if (!result) {
 117         result = (SEL)(copy ? strdup(name) : name);
 118         __objc_sel_set_add(_objc_selectors, result);
 119 #if defined(DUMP_UNKNOWN_SELECTORS)
 120         printf("\t\"%s\",\n", name);
 121 #endif
 122     }
 123
 124     if (lock) selLock.unlockWrite();
 125     return result;
 126 }
 127
 128
 129 SEL sel_registerName(const char *name) {
 130     return __sel_registerName(name, 1, 1);     // YES lock, YES copy
 131 }
 132
 133 SEL sel_registerNameNoLock(const char *name, bool copy) {
 134     return __sel_registerName(name, 0, copy);  // NO lock, maybe copy
 135 }
 136
 137 void sel_lock(void)
 138 {
 139     selLock.write();
 140 }
 141
 142 void sel_unlock(void)
 143 {
 144     selLock.unlockWrite();
 145 }
 146
 147
 148 // 2001/1/24
 149 // the majority of uses of this function (which used to return NULL if not found)
 150 // did not check for NULL, so, in fact, never return NULL
 151 //
 152 SEL sel_getUid(const char *name) {
 153     return __sel_registerName(name, 2, 1);  // YES lock, YES copy
 154 }
 155
 156
 157 BOOL sel_isEqual(SEL lhs, SEL rhs)
 158 {
 159     return bool(lhs == rhs);
 160 }
 161
 162
 163 /***********************************************************************
 164 * sel_init
 165 * Initialize selector tables and register selectors used internally.
 166 **********************************************************************/
 167 void sel_init(size_t selrefCount)
 168 {
 169     // save this value for later
 170     SelrefCount = selrefCount;
 171
 172 #if SUPPORT_PREOPT
 173     builtins = preoptimizedSelectors();
 174 #endif
 175
 176     // Register selectors used by libobjc
 177
 178 #define s(x) SEL_##x = sel_registerNameNoLock(#x, NO)
 179 #define t(x,y) SEL_##y = sel_registerNameNoLock(#x, NO)
 180
 181     sel_lock();
 182
 183     s(load);
 184     s(initialize);
 185     t(resolveInstanceMethod:, resolveInstanceMethod);
 186     t(resolveClassMethod:, resolveClassMethod);
 187     t(.cxx_construct, cxx_construct);
 188     t(.cxx_destruct, cxx_destruct);
 189     s(retain);
 190     s(release);
 191     s(autorelease);
 192     s(retainCount);
 193     s(alloc);
 194     t(allocWithZone:, allocWithZone);
 195     s(dealloc);
 196     s(copy);
 197     s(new);
 198     t(forwardInvocation:, forwardInvocation);
 199     t(_tryRetain, tryRetain);
 200     t(_isDeallocating, isDeallocating);
 201     s(retainWeakReference);
 202     s(allowsWeakReference);
 203
 204     extern SEL FwdSel;
 205     FwdSel = sel_registerNameNoLock("forward::", NO);
 206
 207     sel_unlock();
 208
 209 #undef s
 210 #undef t
 211 }
 212
 213 __END_DECLS
 214
 215 #endif