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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "IdentifierRep.h"
     28 
     29 #include "PlatformString.h"
     30 #include <runtime/UString.h>
     31 #include <wtf/HashMap.h>
     32 #include <wtf/StdLibExtras.h>
     33 
     34 using namespace JSC;
     35 
     36 namespace WebCore {
     37 
     38 typedef HashSet<IdentifierRep*> IdentifierSet;
     39 
     40 static IdentifierSet& identifierSet()
     41 {
     42     DEFINE_STATIC_LOCAL(IdentifierSet, identifierSet, ());
     43     return identifierSet;
     44 }
     45 
     46 typedef HashMap<int, IdentifierRep*> IntIdentifierMap;
     47 
     48 static IntIdentifierMap& intIdentifierMap()
     49 {
     50     DEFINE_STATIC_LOCAL(IntIdentifierMap, intIdentifierMap, ());
     51     return intIdentifierMap;
     52 }
     53 
     54 IdentifierRep* IdentifierRep::get(int intID)
     55 {
     56     if (intID == 0 || intID == -1) {
     57         static IdentifierRep* negativeOneAndZeroIdentifiers[2];
     58 
     59         IdentifierRep* identifier = negativeOneAndZeroIdentifiers[intID + 1];
     60         if (!identifier) {
     61             identifier = new IdentifierRep(intID);
     62 
     63             negativeOneAndZeroIdentifiers[intID + 1] = identifier;
     64         }
     65 
     66         return identifier;
     67     }
     68 
     69     pair<IntIdentifierMap::iterator, bool> result = intIdentifierMap().add(intID, 0);
     70     if (result.second) {
     71         ASSERT(!result.first->second);
     72         result.first->second = new IdentifierRep(intID);
     73 
     74         identifierSet().add(result.first->second);
     75     }
     76 
     77     return result.first->second;
     78 }
     79 
     80 typedef HashMap<RefPtr<JSC::UString::Rep>, IdentifierRep*> StringIdentifierMap;
     81 
     82 static StringIdentifierMap& stringIdentifierMap()
     83 {
     84     DEFINE_STATIC_LOCAL(StringIdentifierMap, stringIdentifierMap, ());
     85     return stringIdentifierMap;
     86 }
     87 
     88 IdentifierRep* IdentifierRep::get(const char* name)
     89 {
     90     ASSERT(name);
     91     if (!name)
     92         return 0;
     93 
     94     UString string = String::fromUTF8WithLatin1Fallback(name, strlen(name));
     95     pair<StringIdentifierMap::iterator, bool> result = stringIdentifierMap().add(string.rep(), 0);
     96     if (result.second) {
     97         ASSERT(!result.first->second);
     98         result.first->second = new IdentifierRep(name);
     99 
    100         identifierSet().add(result.first->second);
    101     }
    102 
    103     return result.first->second;
    104 }
    105 
    106 bool IdentifierRep::isValid(IdentifierRep* identifier)
    107 {
    108     return identifierSet().contains(identifier);
    109 }
    110 
    111 } // namespace WebCore
    112