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 __BEGIN_DECLS
  37
  38 static size_t SelrefCount = 0;
  39
  40 static const char *_objc_empty_selector = "";
  41 static struct __objc_sel_set *_objc_selectors = NULL;
  42
  43
  44 static SEL _objc_search_builtins(const char *key)
  45 {
  46 #if defined(DUMP_SELECTORS)
  47     if (NULL != key) printf("\t\"%s\",\n", key);
  48 #endif
  49
  50     if (!key) return (SEL)0;
  51     if ('\0' == *key) return (SEL)_objc_empty_selector;
  52
  53     return (SEL)0;
  54 }
  55
  56
  57 const char *sel_getName(SEL sel) {
  58     return sel ? (const char *)sel : "<null selector>";
  59 }
  60
  61
  62 BOOL sel_isMapped(SEL name)
  63 {
  64     SEL sel;
  65
  66     if (!name) return NO;
  67
  68     sel = _objc_search_builtins((const char *)name);
  69     if (sel) return YES;
  70
  71     mutex_locker_t lock(selLock);
  72     if (_objc_selectors) {
  73         sel = __objc_sel_set_get(_objc_selectors, name);
  74     }
  75     return bool(sel);
  76 }
  77
  78 static SEL __sel_registerName(const char *name, bool shouldLock, bool copy)
  79 {
  80     SEL result = 0;
  81
  82     if (shouldLock) selLock.assertUnlocked();
  83     else selLock.assertLocked();
  84
  85     if (!name) return (SEL)0;
  86     result = _objc_search_builtins(name);
  87     if (result) return result;
  88
  89     conditional_mutex_locker_t lock(selLock, shouldLock);
  90     if (_objc_selectors) {
  91         result = __objc_sel_set_get(_objc_selectors, (SEL)name);
  92     }
  93     if (result) return result;
  94
  95     // No match. Insert.
  96
  97     if (!_objc_selectors) {
  98         _objc_selectors = __objc_sel_set_create(SelrefCount);
  99     }
 100     if (!result) {
 101         result = (SEL)(copy ? strdup(name) : name);
 102         __objc_sel_set_add(_objc_selectors, result);
 103 #if defined(DUMP_UNKNOWN_SELECTORS)
 104         printf("\t\"%s\",\n", name);
 105 #endif
 106     }
 107
 108     return result;
 109 }
 110
 111
 112 SEL sel_registerName(const char *name) {
 113     return __sel_registerName(name, 1, 1);     // YES lock, YES copy
 114 }
 115
 116 SEL sel_registerNameNoLock(const char *name, bool copy) {
 117     return __sel_registerName(name, 0, copy);  // NO lock, maybe copy
 118 }
 119
 120
 121 // 2001/1/24
 122 // the majority of uses of this function (which used to return NULL if not found)
 123 // did not check for NULL, so, in fact, never return NULL
 124 //
 125 SEL sel_getUid(const char *name) {
 126     return __sel_registerName(name, 2, 1);  // YES lock, YES copy
 127 }
 128
 129
 130 BOOL sel_isEqual(SEL lhs, SEL rhs)
 131 {
 132     return bool(lhs == rhs);
 133 }
 134
 135
 136 /***********************************************************************
 137 * sel_init
 138 * Initialize selector tables and register selectors used internally.
 139 **********************************************************************/
 140 void sel_init(size_t selrefCount)
 141 {
 142     // save this value for later
 143     SelrefCount = selrefCount;
 144
 145     // Register selectors used by libobjc
 146
 147     mutex_locker_t lock(selLock);
 148
 149     SEL_cxx_construct = sel_registerNameNoLock(".cxx_construct", NO);
 150     SEL_cxx_destruct = sel_registerNameNoLock(".cxx_destruct", NO);
 151
 152     extern SEL FwdSel;
 153     FwdSel = sel_registerNameNoLock("forward::", NO);
 154 }
 155
 156 __END_DECLS
 157
 158 #endif