Simplify AtomicStringTable and remove lots of dead code.

third_party/WebKit/Source/wtf/text/AtomicString.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "wtf/text/AtomicString.h"
 
 #include "wtf/dtoa.h"
 #include "wtf/text/AtomicStringTable.h"
 #include "wtf/text/IntegerToStringConversion.h"
+#include "wtf/text/StringImpl.h"
 
 namespace WTF {
 
 static_assert(sizeof(AtomicString) == sizeof(String), "AtomicString and String must be same size");
 
 AtomicString::AtomicString(const LChar* chars, unsigned length)
     : m_string(AtomicStringTable::instance().add(chars, length)) {}
 
 AtomicString::AtomicString(const UChar* chars, unsigned length)
     : m_string(AtomicStringTable::instance().add(chars, length)) {}
 
-AtomicString::AtomicString(const UChar* chars, unsigned length, unsigned existingHash)
-    : m_string(AtomicStringTable::instance().add(chars, length, existingHash)) {}
+AtomicString::AtomicString(const UChar* chars)
+    : m_string(AtomicStringTable::instance().add(chars, chars ? lengthOfNullTerminatedString(chars) : 0)) {}
 
-AtomicString::AtomicString(const UChar* chars)
-    : m_string(AtomicStringTable::instance().add(chars)) {}
-
-AtomicString::AtomicString(StringImpl* string, unsigned offset, unsigned length)
-    : m_string(AtomicStringTable::instance().add(string, offset, length)) {}
-
-PassRefPtr<StringImpl> AtomicString::addSlowCase(StringImpl* chars)
+PassRefPtr<StringImpl> AtomicString::addSlowCase(StringImpl* string)
 {
-    DCHECK(!chars->isAtomic());
-    return AtomicStringTable::instance().add(chars);
+    DCHECK(!string->isAtomic());
+    return AtomicStringTable::instance().add(string);
 }
 
 AtomicString AtomicString::fromUTF8(const char* chars, size_t length)
 {
     if (!chars)
         return nullAtom;
     if (!length)
         return emptyAtom;
     return AtomicString(AtomicStringTable::instance().addUTF8(chars, chars + length));
 }
@@ skipping 79 matching lines @@
 }
 
 #ifndef NDEBUG
 void AtomicString::show() const
 {
     m_string.show();
 }
 #endif
 
 } // namespace WTF