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 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 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 "JSDOMBinding.h" 30#include <wtf/HashMap.h> 31#include <wtf/NeverDestroyed.h> 32#include <wtf/StdLibExtras.h> 33#include <wtf/text/WTFString.h> 34 35using namespace JSC; 36 37namespace WebCore { 38 39typedef HashSet<IdentifierRep*> IdentifierSet; 40 41static IdentifierSet& identifierSet() 42{ 43 static NeverDestroyed<IdentifierSet> identifierSet; 44 return identifierSet; 45} 46 47typedef HashMap<int, IdentifierRep*> IntIdentifierMap; 48 49static IntIdentifierMap& intIdentifierMap() 50{ 51 static NeverDestroyed<IntIdentifierMap> intIdentifierMap; 52 return intIdentifierMap; 53} 54 55IdentifierRep* IdentifierRep::get(int intID) 56{ 57 if (intID == 0 || intID == -1) { 58 static IdentifierRep* negativeOneAndZeroIdentifiers[2]; 59 60 IdentifierRep* identifier = negativeOneAndZeroIdentifiers[intID + 1]; 61 if (!identifier) { 62 identifier = new IdentifierRep(intID); 63 64 negativeOneAndZeroIdentifiers[intID + 1] = identifier; 65 } 66 67 return identifier; 68 } 69 70 IntIdentifierMap::AddResult result = intIdentifierMap().add(intID, nullptr); 71 if (result.isNewEntry) { 72 ASSERT(!result.iterator->value); 73 result.iterator->value = new IdentifierRep(intID); 74 75 identifierSet().add(result.iterator->value); 76 } 77 78 return result.iterator->value; 79} 80 81typedef HashMap<RefPtr<StringImpl>, IdentifierRep*> StringIdentifierMap; 82 83static StringIdentifierMap& stringIdentifierMap() 84{ 85 static NeverDestroyed<StringIdentifierMap> stringIdentifierMap; 86 return stringIdentifierMap; 87} 88 89IdentifierRep* IdentifierRep::get(const char* name) 90{ 91 ASSERT(name); 92 if (!name) 93 return 0; 94 95 String string = String::fromUTF8WithLatin1Fallback(name, strlen(name)); 96 StringIdentifierMap::AddResult result = stringIdentifierMap().add(string.impl(), nullptr); 97 if (result.isNewEntry) { 98 ASSERT(!result.iterator->value); 99 result.iterator->value = new IdentifierRep(name); 100 101 identifierSet().add(result.iterator->value); 102 } 103 104 return result.iterator->value; 105} 106 107bool IdentifierRep::isValid(IdentifierRep* identifier) 108{ 109 return identifierSet().contains(identifier); 110} 111 112} // namespace WebCore 113