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 sel;
  81
  82     if (!name) return NO;
  83 #if SUPPORT_IGNORED_SELECTOR_CONSTANT
  84     if ((uintptr_t)name == kIgnore) return YES;
  85 #endif
  86
  87     sel = _objc_search_builtins((const char *)name);
  88     if (sel) return YES;
  89
  90     rwlock_reader_t lock(selLock);
  91     if (_objc_selectors) {
  92         sel = __objc_sel_set_get(_objc_selectors, name);
  93     }
  94     return bool(sel);
  95 }
  96
  97 static SEL __sel_registerName(const char *name, int lock, int copy)
  98 {
  99     SEL result = 0;
 100
 101     if (lock) selLock.assertUnlocked();
 102     else selLock.assertWriting();
 103
 104     if (!name) return (SEL)0;
 105     result = _objc_search_builtins(name);
 106     if (result) return result;
 107
 108     if (lock) selLock.read();
 109     if (_objc_selectors) {
 110         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
 111     }
 112     if (lock) selLock.unlockRead();
 113     if (result) return result;
 114
 115     // No match. Insert.
 116
 117     if (lock) selLock.write();
 118
 119     if (!_objc_selectors) {
 120         _objc_selectors = __objc_sel_set_create(SelrefCount);
 121     }
 122     if (lock) {
 123         // Rescan in case it was added while we dropped the lock
 124         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
 125     }
 126     if (!result) {
 127         result = (SEL)(copy ? strdup(name) : name);
 128         __objc_sel_set_add(_objc_selectors, result);
 129 #if defined(DUMP_UNKNOWN_SELECTORS)
 130         printf("\t\"%s\",\n", name);
 131 #endif
 132     }
 133
 134     if (lock) selLock.unlockWrite();
 135     return result;
 136 }
 137
 138
 139 SEL sel_registerName(const char *name) {
 140     return __sel_registerName(name, 1, 1);     // YES lock, YES copy
 141 }
 142
 143 SEL sel_registerNameNoLock(const char *name, bool copy) {
 144     return __sel_registerName(name, 0, copy);  // NO lock, maybe copy
 145 }
 146
 147 void sel_lock(void)
 148 {
 149     selLock.write();
 150 }
 151
 152 void sel_unlock(void)
 153 {
 154     selLock.unlockWrite();
 155 }
 156
 157
 158 // 2001/1/24
 159 // the majority of uses of this function (which used to return NULL if not found)
 160 // did not check for NULL, so, in fact, never return NULL
 161 //
 162 SEL sel_getUid(const char *name) {
 163     return __sel_registerName(name, 2, 1);  // YES lock, YES copy
 164 }
 165
 166
 167 BOOL sel_isEqual(SEL lhs, SEL rhs)
 168 {
 169     return bool(lhs == rhs);
 170 }
 171
 172
 173 /***********************************************************************
 174 * sel_init
 175 * Initialize selector tables and register selectors used internally.
 176 **********************************************************************/
 177 void sel_init(bool wantsGC, size_t selrefCount)
 178 {
 179     // save this value for later
 180     SelrefCount = selrefCount;
 181
 182 #if SUPPORT_PREOPT
 183     builtins = preoptimizedSelectors();
 184 #endif
 185
 186     // Register selectors used by libobjc
 187
 188     if (wantsGC) {
 189         // Registering retain/release/autorelease requires GC decision first.
 190         // sel_init doesn't actually need the wantsGC parameter, it just
 191         // helps enforce the initialization order.
 192     }
 193
 194 #define s(x) SEL_##x = sel_registerNameNoLock(#x, NO)
 195 #define t(x,y) SEL_##y = sel_registerNameNoLock(#x, NO)
 196
 197     sel_lock();
 198
 199     s(load);
 200     s(initialize);
 201     t(resolveInstanceMethod:, resolveInstanceMethod);
 202     t(resolveClassMethod:, resolveClassMethod);
 203     t(.cxx_construct, cxx_construct);
 204     t(.cxx_destruct, cxx_destruct);
 205     s(retain);
 206     s(release);
 207     s(autorelease);
 208     s(retainCount);
 209     s(alloc);
 210     t(allocWithZone:, allocWithZone);
 211     s(dealloc);
 212     s(copy);
 213     s(new);
 214     s(finalize);
 215     t(forwardInvocation:, forwardInvocation);
 216     t(_tryRetain, tryRetain);
 217     t(_isDeallocating, isDeallocating);
 218     s(retainWeakReference);
 219     s(allowsWeakReference);
 220
 221     extern SEL FwdSel;
 222     FwdSel = sel_registerNameNoLock("forward::", NO);
 223
 224     sel_unlock();
 225
 226 #undef s
 227 #undef t
 228 }
 229
 230 __END_DECLS
 231
 232 #endif