diff -r 000000000000 -r 4f2f89ce4247 WebCore/bridge/IdentifierRep.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bridge/IdentifierRep.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "IdentifierRep.h"
+#include "JSDOMBinding.h"
+
+#include "PlatformString.h"
+#include <runtime/UString.h>
+#include <wtf/HashMap.h>
+#include <wtf/StdLibExtras.h>
+
+using namespace JSC;
+
+namespace WebCore {
+
+typedef HashSet<IdentifierRep*> IdentifierSet;
+
+static IdentifierSet& identifierSet()
+{
+    DEFINE_STATIC_LOCAL(IdentifierSet, identifierSet, ());
+    return identifierSet;
+}
+    
+typedef HashMap<int, IdentifierRep*> IntIdentifierMap;
+
+static IntIdentifierMap& intIdentifierMap()
+{
+    DEFINE_STATIC_LOCAL(IntIdentifierMap, intIdentifierMap, ());
+    return intIdentifierMap;
+}
+
+IdentifierRep* IdentifierRep::get(int intID)
+{
+    if (intID == 0 || intID == -1) {
+        static IdentifierRep* negativeOneAndZeroIdentifiers[2];
+
+        IdentifierRep* identifier = negativeOneAndZeroIdentifiers[intID + 1];
+        if (!identifier) {
+            identifier = new IdentifierRep(intID);
+
+            negativeOneAndZeroIdentifiers[intID + 1] = identifier;
+        }
+        
+        return identifier;
+    }
+    
+    pair<IntIdentifierMap::iterator, bool> result = intIdentifierMap().add(intID, 0); 
+    if (result.second) {
+        ASSERT(!result.first->second);
+        result.first->second = new IdentifierRep(intID);
+        
+        identifierSet().add(result.first->second);
+    }
+    
+    return result.first->second;
+}
+
+typedef HashMap<RefPtr<JSC::UString::Rep>, IdentifierRep*> StringIdentifierMap;
+
+static StringIdentifierMap& stringIdentifierMap()
+{
+    DEFINE_STATIC_LOCAL(StringIdentifierMap, stringIdentifierMap, ());
+    return stringIdentifierMap;
+}
+
+IdentifierRep* IdentifierRep::get(const char* name)
+{
+    ASSERT(name);
+    if (!name)
+        return 0;
+  
+    UString string = stringToUString(String::fromUTF8WithLatin1Fallback(name, strlen(name)));
+    pair<StringIdentifierMap::iterator, bool> result = stringIdentifierMap().add(string.rep(), 0);
+    if (result.second) {
+        ASSERT(!result.first->second);
+        result.first->second = new IdentifierRep(name);
+        
+        identifierSet().add(result.first->second);
+    }
+    
+    return result.first->second;
+}
+
+bool IdentifierRep::isValid(IdentifierRep* identifier)
+{
+    return identifierSet().contains(identifier);
+}
+    
+} // namespace WebCore