Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/text/StringImpl.h

Index: Source/WTF/wtf/text/StringImpl.h
diff --git a/Source/WTF/wtf/text/StringImpl.h b/Source/WTF/wtf/text/StringImpl.h
deleted file mode 100644
index 63296c65631741efc05b1daa3881bef2be862f23..0000000000000000000000000000000000000000
--- a/Source/WTF/wtf/text/StringImpl.h
+++ /dev/null
@@ -1,1193 +0,0 @@
-/*
- * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
- * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
- * Copyright (C) 2009 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.
- *
- */
-
-#ifndef StringImpl_h
-#define StringImpl_h
-
-#include <limits.h>
-#include <wtf/ASCIICType.h>
-#include <wtf/Forward.h>
-#include <wtf/StdLibExtras.h>
-#include <wtf/StringHasher.h>
-#include <wtf/Vector.h>
-#include <wtf/unicode/Unicode.h>
-
-#if USE(CF)
-typedef const struct __CFString * CFStringRef;
-#endif
-
-#ifdef __OBJC__
-@class NSString;
-#endif
-
-namespace WTF {
-
-struct CStringTranslator;
-template<typename CharacterType> struct HashAndCharactersTranslator;
-struct HashAndUTF8CharactersTranslator;
-struct LCharBufferTranslator;
-struct CharBufferFromLiteralDataTranslator;
-class MemoryObjectInfo;
-struct SubstringTranslator;
-struct UCharBufferTranslator;
-template<typename> class RetainPtr;
-
-enum TextCaseSensitivity { TextCaseSensitive, TextCaseInsensitive };
-
-typedef bool (*CharacterMatchFunctionPtr)(UChar);
-typedef bool (*IsWhiteSpaceFunctionPtr)(UChar);
-
-// Define STRING_STATS to turn on run time statistics of string sizes and memory usage
-#undef STRING_STATS
-
-#ifdef STRING_STATS
-struct StringStats {
-    inline void add8BitString(unsigned length, bool isSubString = false)
-    {
-        ++m_totalNumberStrings;
-        ++m_number8BitStrings;
-        if (!isSubString)
-            m_total8BitData += length;
-    }
-
-    inline void add16BitString(unsigned length, bool isSubString = false)
-    {
-        ++m_totalNumberStrings;
-        ++m_number16BitStrings;
-        if (!isSubString)
-            m_total16BitData += length;
-    }
-
-    inline void addUpconvertedString(unsigned length)
-    {
-        ++m_numberUpconvertedStrings;
-        m_totalUpconvertedData += length;
-    }
-
-    void removeString(StringImpl*);
-    void printStats();
-
-    static const unsigned s_printStringStatsFrequency = 5000;
-    static unsigned s_stringRemovesTillPrintStats;
-
-    unsigned m_totalNumberStrings;
-    unsigned m_number8BitStrings;
-    unsigned m_number16BitStrings;
-    unsigned m_numberUpconvertedStrings;
-    unsigned long long m_total8BitData;
-    unsigned long long m_total16BitData;
-    unsigned long long m_totalUpconvertedData;
-};
-
-#define STRING_STATS_ADD_8BIT_STRING(length) StringImpl::stringStats().add8BitString(length)
-#define STRING_STATS_ADD_8BIT_STRING2(length, isSubString) StringImpl::stringStats().add8BitString(length, isSubString)
-#define STRING_STATS_ADD_16BIT_STRING(length) StringImpl::stringStats().add16BitString(length)
-#define STRING_STATS_ADD_16BIT_STRING2(length, isSubString) StringImpl::stringStats().add16BitString(length, isSubString)
-#define STRING_STATS_ADD_UPCONVERTED_STRING(length) StringImpl::stringStats().addUpconvertedString(length)
-#define STRING_STATS_REMOVE_STRING(string) StringImpl::stringStats().removeString(string)
-#else
-#define STRING_STATS_ADD_8BIT_STRING(length) ((void)0)
-#define STRING_STATS_ADD_8BIT_STRING2(length, isSubString) ((void)0)
-#define STRING_STATS_ADD_16BIT_STRING(length) ((void)0)
-#define STRING_STATS_ADD_16BIT_STRING2(length, isSubString) ((void)0)
-#define STRING_STATS_ADD_UPCONVERTED_STRING(length) ((void)0)
-#define STRING_STATS_REMOVE_STRING(string) ((void)0)
-#endif
-
-class StringImpl {
-    WTF_MAKE_NONCOPYABLE(StringImpl); WTF_MAKE_FAST_ALLOCATED;
-    friend struct WTF::CStringTranslator;
-    template<typename CharacterType> friend struct WTF::HashAndCharactersTranslator;
-    friend struct WTF::HashAndUTF8CharactersTranslator;
-    friend struct WTF::CharBufferFromLiteralDataTranslator;
-    friend struct WTF::LCharBufferTranslator;
-    friend struct WTF::SubstringTranslator;
-    friend struct WTF::UCharBufferTranslator;
-    friend class AtomicStringImpl;
-    
-private:
-    enum BufferOwnership {
-        BufferInternal,
-        BufferOwned,
-        BufferSubstring,
-        // NOTE: Adding more ownership types needs to extend m_hashAndFlags as we're at capacity
-    };
-
-    // Used to construct static strings, which have an special refCount that can never hit zero.
-    // This means that the static string will never be destroyed, which is important because
-    // static strings will be shared across threads & ref-counted in a non-threadsafe manner.
-    enum ConstructStaticStringTag { ConstructStaticString };
-    StringImpl(const UChar* characters, unsigned length, ConstructStaticStringTag)
-        : m_refCount(s_refCountFlagIsStaticString)
-        , m_length(length)
-        , m_data16(characters)
-        , m_buffer(0)
-        , m_hashAndFlags(s_hashFlagIsIdentifier | BufferOwned)
-    {
-        // Ensure that the hash is computed so that AtomicStringHash can call existingHash()
-        // with impunity. The empty string is special because it is never entered into
-        // AtomicString's HashKey, but still needs to compare correctly.
-        STRING_STATS_ADD_16BIT_STRING(m_length);
-
-        hash();
-    }
-
-    // Used to construct static strings, which have an special refCount that can never hit zero.
-    // This means that the static string will never be destroyed, which is important because
-    // static strings will be shared across threads & ref-counted in a non-threadsafe manner.
-    StringImpl(const LChar* characters, unsigned length, ConstructStaticStringTag)
-        : m_refCount(s_refCountFlagIsStaticString)
-        , m_length(length)
-        , m_data8(characters)
-        , m_buffer(0)
-        , m_hashAndFlags(s_hashFlag8BitBuffer | s_hashFlagIsIdentifier | BufferOwned)
-    {
-        // Ensure that the hash is computed so that AtomicStringHash can call existingHash()
-        // with impunity. The empty string is special because it is never entered into
-        // AtomicString's HashKey, but still needs to compare correctly.
-        STRING_STATS_ADD_8BIT_STRING(m_length);
-
-        hash();
-    }
-
-    // FIXME: there has to be a less hacky way to do this.
-    enum Force8Bit { Force8BitConstructor };
-    // Create a normal 8-bit string with internal storage (BufferInternal)
-    StringImpl(unsigned length, Force8Bit)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data8(reinterpret_cast<const LChar*>(this + 1))
-        , m_buffer(0)
-        , m_hashAndFlags(s_hashFlag8BitBuffer | BufferInternal)
-    {
-        ASSERT(m_data8);
-        ASSERT(m_length);
-
-        STRING_STATS_ADD_8BIT_STRING(m_length);
-    }
-
-    // Create a normal 16-bit string with internal storage (BufferInternal)
-    StringImpl(unsigned length)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data16(reinterpret_cast<const UChar*>(this + 1))
-        , m_buffer(0)
-        , m_hashAndFlags(BufferInternal)
-    {
-        ASSERT(m_data16);
-        ASSERT(m_length);
-
-        STRING_STATS_ADD_16BIT_STRING(m_length);
-    }
-
-    // Create a StringImpl adopting ownership of the provided buffer (BufferOwned)
-    StringImpl(const LChar* characters, unsigned length)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data8(characters)
-        , m_buffer(0)
-        , m_hashAndFlags(s_hashFlag8BitBuffer | BufferOwned)
-    {
-        ASSERT(m_data8);
-        ASSERT(m_length);
-
-        STRING_STATS_ADD_8BIT_STRING(m_length);
-    }
-
-    enum ConstructFromLiteralTag { ConstructFromLiteral };
-    StringImpl(const char* characters, unsigned length, ConstructFromLiteralTag)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data8(reinterpret_cast<const LChar*>(characters))
-        , m_buffer(0)
-        , m_hashAndFlags(s_hashFlag8BitBuffer | BufferInternal | s_hashFlagHasTerminatingNullCharacter)
-    {
-        ASSERT(m_data8);
-        ASSERT(m_length);
-        ASSERT(!characters[length]);
-
-        STRING_STATS_ADD_8BIT_STRING(0);
-    }
-
-    // Create a StringImpl adopting ownership of the provided buffer (BufferOwned)
-    StringImpl(const UChar* characters, unsigned length)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data16(characters)
-        , m_buffer(0)
-        , m_hashAndFlags(BufferOwned)
-    {
-        ASSERT(m_data16);
-        ASSERT(m_length);
-
-        STRING_STATS_ADD_16BIT_STRING(m_length);
-    }
-
-    // Used to create new strings that are a substring of an existing 8-bit StringImpl (BufferSubstring)
-    StringImpl(const LChar* characters, unsigned length, PassRefPtr<StringImpl> base)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data8(characters)
-        , m_substringBuffer(base.leakRef())
-        , m_hashAndFlags(s_hashFlag8BitBuffer | BufferSubstring)
-    {
-        ASSERT(is8Bit());
-        ASSERT(m_data8);
-        ASSERT(m_length);
-        ASSERT(m_substringBuffer->bufferOwnership() != BufferSubstring);
-
-        STRING_STATS_ADD_8BIT_STRING2(m_length, true);
-    }
-
-    // Used to create new strings that are a substring of an existing 16-bit StringImpl (BufferSubstring)
-    StringImpl(const UChar* characters, unsigned length, PassRefPtr<StringImpl> base)
-        : m_refCount(s_refCountIncrement)
-        , m_length(length)
-        , m_data16(characters)
-        , m_substringBuffer(base.leakRef())
-        , m_hashAndFlags(BufferSubstring)
-    {
-        ASSERT(!is8Bit());
-        ASSERT(m_data16);
-        ASSERT(m_length);
-        ASSERT(m_substringBuffer->bufferOwnership() != BufferSubstring);
-
-        STRING_STATS_ADD_16BIT_STRING2(m_length, true);
-    }
-
-    enum CreateEmptyUnique_T { CreateEmptyUnique };
-    StringImpl(CreateEmptyUnique_T)
-        : m_refCount(s_refCountIncrement)
-        , m_length(0)
-        , m_data16(reinterpret_cast<const UChar*>(1))
-        , m_buffer(0)
-    {
-        ASSERT(m_data16);
-        // Set the hash early, so that all empty unique StringImpls have a hash,
-        // and don't use the normal hashing algorithm - the unique nature of these
-        // keys means that we don't need them to match any other string (in fact,
-        // that's exactly the oposite of what we want!), and teh normal hash would
-        // lead to lots of conflicts.
-        unsigned hash = reinterpret_cast<uintptr_t>(this);
-        hash <<= s_flagCount;
-        if (!hash)
-            hash = 1 << s_flagCount;
-        m_hashAndFlags = hash | BufferInternal;
-
-        STRING_STATS_ADD_16BIT_STRING(m_length);
-    }
-public:
-    WTF_EXPORT_STRING_API ~StringImpl();
-
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> create(const UChar*, unsigned length);
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> create(const LChar*, unsigned length);
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> create8BitIfPossible(const UChar*, unsigned length);
-    template<size_t inlineCapacity>
-    static PassRefPtr<StringImpl> create8BitIfPossible(const Vector<UChar, inlineCapacity>& vector)
-    {
-        return create8BitIfPossible(vector.data(), vector.size());
-    }
-
-    ALWAYS_INLINE static PassRefPtr<StringImpl> create(const char* s, unsigned length) { return create(reinterpret_cast<const LChar*>(s), length); }
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> create(const LChar*);
-    ALWAYS_INLINE static PassRefPtr<StringImpl> create(const char* s) { return create(reinterpret_cast<const LChar*>(s)); }
-
-    static ALWAYS_INLINE PassRefPtr<StringImpl> create8(PassRefPtr<StringImpl> rep, unsigned offset, unsigned length)
-    {
-        ASSERT(rep);
-        ASSERT(length <= rep->length());
-
-        if (!length)
-            return empty();
-
-        ASSERT(rep->is8Bit());
-        StringImpl* ownerRep = (rep->bufferOwnership() == BufferSubstring) ? rep->m_substringBuffer : rep.get();
-        return adoptRef(new StringImpl(rep->m_data8 + offset, length, ownerRep));
-    }
-
-    static ALWAYS_INLINE PassRefPtr<StringImpl> create(PassRefPtr<StringImpl> rep, unsigned offset, unsigned length)
-    {
-        ASSERT(rep);
-        ASSERT(length <= rep->length());
-
-        if (!length)
-            return empty();
-
-        StringImpl* ownerRep = (rep->bufferOwnership() == BufferSubstring) ? rep->m_substringBuffer : rep.get();
-        if (rep->is8Bit())
-            return adoptRef(new StringImpl(rep->m_data8 + offset, length, ownerRep));
-        return adoptRef(new StringImpl(rep->m_data16 + offset, length, ownerRep));
-    }
-
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> createFromLiteral(const char* characters, unsigned length);
-    template<unsigned charactersCount>
-    ALWAYS_INLINE static PassRefPtr<StringImpl> createFromLiteral(const char (&characters)[charactersCount])
-    {
-        COMPILE_ASSERT(charactersCount > 1, StringImplFromLiteralNotEmpty);
-        COMPILE_ASSERT((charactersCount - 1 <= ((unsigned(~0) - sizeof(StringImpl)) / sizeof(LChar))), StringImplFromLiteralCannotOverflow);
-
-        return createFromLiteral(characters, charactersCount - 1);
-    }
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> createFromLiteral(const char* characters);
-
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> createUninitialized(unsigned length, LChar*& data);
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> createUninitialized(unsigned length, UChar*& data);
-    template <typename T> static ALWAYS_INLINE PassRefPtr<StringImpl> tryCreateUninitialized(unsigned length, T*& output)
-    {
-        if (!length) {
-            output = 0;
-            return empty();
-        }
-
-        if (length > ((std::numeric_limits<unsigned>::max() - sizeof(StringImpl)) / sizeof(T))) {
-            output = 0;
-            return 0;
-        }
-        StringImpl* resultImpl;
-        if (!tryFastMalloc(sizeof(T) * length + sizeof(StringImpl)).getValue(resultImpl)) {
-            output = 0;
-            return 0;
-        }
-        output = reinterpret_cast<T*>(resultImpl + 1);
-
-        if (sizeof(T) == sizeof(char))
-            return adoptRef(new (NotNull, resultImpl) StringImpl(length, Force8BitConstructor));
-
-        return adoptRef(new (NotNull, resultImpl) StringImpl(length));
-    }
-
-    static PassRefPtr<StringImpl> createEmptyUnique()
-    {
-        return adoptRef(new StringImpl(CreateEmptyUnique));
-    }
-
-    // Reallocate the StringImpl. The originalString must be only owned by the PassRefPtr,
-    // and the buffer ownership must be BufferInternal. Just like the input pointer of realloc(),
-    // the originalString can't be used after this function.
-    static PassRefPtr<StringImpl> reallocate(PassRefPtr<StringImpl> originalString, unsigned length, LChar*& data);
-    static PassRefPtr<StringImpl> reallocate(PassRefPtr<StringImpl> originalString, unsigned length, UChar*& data);
-
-    static unsigned flagsOffset() { return OBJECT_OFFSETOF(StringImpl, m_hashAndFlags); }
-    static unsigned flagIs8Bit() { return s_hashFlag8BitBuffer; }
-    static unsigned dataOffset() { return OBJECT_OFFSETOF(StringImpl, m_data8); }
-    static PassRefPtr<StringImpl> createWithTerminatingNullCharacter(const StringImpl&);
-
-    template<typename CharType, size_t inlineCapacity>
-    static PassRefPtr<StringImpl> adopt(Vector<CharType, inlineCapacity>& vector)
-    {
-        if (size_t size = vector.size()) {
-            ASSERT(vector.data());
-            RELEASE_ASSERT(size <= std::numeric_limits<unsigned>::max());
-            return adoptRef(new StringImpl(vector.releaseBuffer(), size));
-        }
-        return empty();
-    }
-
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> adopt(StringBuffer<UChar>&);
-    WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> adopt(StringBuffer<LChar>&);
-
-    unsigned length() const { return m_length; }
-    bool is8Bit() const { return m_hashAndFlags & s_hashFlag8BitBuffer; }
-    bool hasInternalBuffer() const { return bufferOwnership() == BufferInternal; }
-    bool hasOwnedBuffer() const { return bufferOwnership() == BufferOwned; }
-    StringImpl* baseString() const { return bufferOwnership() == BufferSubstring ? m_substringBuffer : 0; }
-
-    // FIXME: Remove all unnecessary usages of characters()
-    ALWAYS_INLINE const LChar* characters8() const { ASSERT(is8Bit()); return m_data8; }
-    ALWAYS_INLINE const UChar* characters16() const { ASSERT(!is8Bit()); return m_data16; }
-    ALWAYS_INLINE const UChar* characters() const
-    {
-        if (!is8Bit())
-            return m_data16;
-
-        return getData16SlowCase();
-    }
-
-    template <typename CharType>
-    ALWAYS_INLINE const CharType * getCharacters() const;
-
-    size_t cost()
-    {
-        // For substrings, return the cost of the base string.
-        if (bufferOwnership() == BufferSubstring)
-            return m_substringBuffer->cost();
-
-        if (m_hashAndFlags & s_hashFlagDidReportCost)
-            return 0;
-
-        m_hashAndFlags |= s_hashFlagDidReportCost;
-        return m_length;
-    }
-
-    WTF_EXPORT_STRING_API size_t sizeInBytes() const;
-
-    bool has16BitShadow() const { return m_hashAndFlags & s_hashFlagHas16BitShadow; }
-    WTF_EXPORT_STRING_API void upconvertCharacters(unsigned, unsigned) const;
-    bool isIdentifier() const { return m_hashAndFlags & s_hashFlagIsIdentifier; }
-    void setIsIdentifier(bool isIdentifier)
-    {
-        ASSERT(!isStatic());
-        if (isIdentifier)
-            m_hashAndFlags |= s_hashFlagIsIdentifier;
-        else
-            m_hashAndFlags &= ~s_hashFlagIsIdentifier;
-    }
-
-    bool isEmptyUnique() const
-    {
-        return !length() && !isStatic();
-    }
-
-    bool hasTerminatingNullCharacter() const { return m_hashAndFlags & s_hashFlagHasTerminatingNullCharacter; }
-
-    bool isAtomic() const { return m_hashAndFlags & s_hashFlagIsAtomic; }
-    void setIsAtomic(bool isAtomic)
-    {
-        if (isAtomic)
-            m_hashAndFlags |= s_hashFlagIsAtomic;
-        else
-            m_hashAndFlags &= ~s_hashFlagIsAtomic;
-    }
-
-    bool isStatic() const { return m_refCount & s_refCountFlagIsStaticString; }
-
-#ifdef STRING_STATS
-    bool isSubString() const { return  bufferOwnership() == BufferSubstring; }
-#endif
-
-private:
-    // The high bits of 'hash' are always empty, but we prefer to store our flags
-    // in the low bits because it makes them slightly more efficient to access.
-    // So, we shift left and right when setting and getting our hash code.
-    void setHash(unsigned hash) const
-    {
-        ASSERT(!hasHash());
-        // Multiple clients assume that StringHasher is the canonical string hash function.
-        ASSERT(hash == (is8Bit() ? StringHasher::computeHashAndMaskTop8Bits(m_data8, m_length) : StringHasher::computeHashAndMaskTop8Bits(m_data16, m_length)));
-        ASSERT(!(hash & (s_flagMask << (8 * sizeof(hash) - s_flagCount)))); // Verify that enough high bits are empty.
-        
-        hash <<= s_flagCount;
-        ASSERT(!(hash & m_hashAndFlags)); // Verify that enough low bits are empty after shift.
-        ASSERT(hash); // Verify that 0 is a valid sentinel hash value.
-
-        m_hashAndFlags |= hash; // Store hash with flags in low bits.
-    }
-
-    unsigned rawHash() const
-    {
-        return m_hashAndFlags >> s_flagCount;
-    }
-
-public:
-    bool hasHash() const
-    {
-        return rawHash() != 0;
-    }
-
-    unsigned existingHash() const
-    {
-        ASSERT(hasHash());
-        return rawHash();
-    }
-
-    unsigned hash() const
-    {
-        if (hasHash())
-            return existingHash();
-        return hashSlowCase();
-    }
-
-    inline bool hasOneRef() const
-    {
-        return m_refCount == s_refCountIncrement;
-    }
-
-    inline void ref()
-    {
-        m_refCount += s_refCountIncrement;
-    }
-
-    inline void deref()
-    {
-        if (m_refCount == s_refCountIncrement) {
-            delete this;
-            return;
-        }
-
-        m_refCount -= s_refCountIncrement;
-    }
-
-    WTF_EXPORT_PRIVATE static StringImpl* empty();
-
-    // FIXME: Does this really belong in StringImpl?
-    template <typename T> static void copyChars(T* destination, const T* source, unsigned numCharacters)
-    {
-        if (numCharacters == 1) {
-            *destination = *source;
-            return;
-        }
-
-        if (numCharacters <= s_copyCharsInlineCutOff) {
-            unsigned i = 0;
-#if (CPU(X86) || CPU(X86_64))
-            const unsigned charsPerInt = sizeof(uint32_t) / sizeof(T);
-
-            if (numCharacters > charsPerInt) {
-                unsigned stopCount = numCharacters & ~(charsPerInt - 1);
-
-                const uint32_t* srcCharacters = reinterpret_cast<const uint32_t*>(source);
-                uint32_t* destCharacters = reinterpret_cast<uint32_t*>(destination);
-                for (unsigned j = 0; i < stopCount; i += charsPerInt, ++j)
-                    destCharacters[j] = srcCharacters[j];
-            }
-#endif
-            for (; i < numCharacters; ++i)
-                destination[i] = source[i];
-        } else
-            memcpy(destination, source, numCharacters * sizeof(T));
-    }
-
-    ALWAYS_INLINE static void copyChars(UChar* destination, const LChar* source, unsigned numCharacters)
-    {
-        for (unsigned i = 0; i < numCharacters; ++i)
-            destination[i] = source[i];
-    }
-
-    // Some string features, like refcounting and the atomicity flag, are not
-    // thread-safe. We achieve thread safety by isolation, giving each thread
-    // its own copy of the string.
-    PassRefPtr<StringImpl> isolatedCopy() const;
-
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> substring(unsigned pos, unsigned len = UINT_MAX);
-
-    UChar operator[](unsigned i) const
-    {
-        ASSERT_WITH_SECURITY_IMPLICATION(i < m_length);
-        if (is8Bit())
-            return m_data8[i];
-        return m_data16[i];
-    }
-    WTF_EXPORT_STRING_API UChar32 characterStartingAt(unsigned);
-
-    WTF_EXPORT_STRING_API bool containsOnlyWhitespace();
-
-    int toIntStrict(bool* ok = 0, int base = 10);
-    unsigned toUIntStrict(bool* ok = 0, int base = 10);
-    int64_t toInt64Strict(bool* ok = 0, int base = 10);
-    uint64_t toUInt64Strict(bool* ok = 0, int base = 10);
-    intptr_t toIntPtrStrict(bool* ok = 0, int base = 10);
-
-    WTF_EXPORT_STRING_API int toInt(bool* ok = 0); // ignores trailing garbage
-    unsigned toUInt(bool* ok = 0); // ignores trailing garbage
-    int64_t toInt64(bool* ok = 0); // ignores trailing garbage
-    uint64_t toUInt64(bool* ok = 0); // ignores trailing garbage
-    intptr_t toIntPtr(bool* ok = 0); // ignores trailing garbage
-
-    // FIXME: Like the strict functions above, these give false for "ok" when there is trailing garbage.
-    // Like the non-strict functions above, these return the value when there is trailing garbage.
-    // It would be better if these were more consistent with the above functions instead.
-    double toDouble(bool* ok = 0);
-    float toFloat(bool* ok = 0);
-
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> lower();
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> upper();
-
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> fill(UChar);
-    // FIXME: Do we need fill(char) or can we just do the right thing if UChar is ASCII?
-    PassRefPtr<StringImpl> foldCase();
-
-    PassRefPtr<StringImpl> stripWhiteSpace();
-    PassRefPtr<StringImpl> stripWhiteSpace(IsWhiteSpaceFunctionPtr);
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> simplifyWhiteSpace();
-    PassRefPtr<StringImpl> simplifyWhiteSpace(IsWhiteSpaceFunctionPtr);
-
-    PassRefPtr<StringImpl> removeCharacters(CharacterMatchFunctionPtr);
-    template <typename CharType>
-    ALWAYS_INLINE PassRefPtr<StringImpl> removeCharacters(const CharType* characters, CharacterMatchFunctionPtr);
-
-    size_t find(LChar character, unsigned start = 0);
-    size_t find(char character, unsigned start = 0);
-    size_t find(UChar character, unsigned start = 0);
-    WTF_EXPORT_STRING_API size_t find(CharacterMatchFunctionPtr, unsigned index = 0);
-    size_t find(const LChar*, unsigned index = 0);
-    ALWAYS_INLINE size_t find(const char* s, unsigned index = 0) { return find(reinterpret_cast<const LChar*>(s), index); }
-    WTF_EXPORT_STRING_API size_t find(StringImpl*);
-    WTF_EXPORT_STRING_API size_t find(StringImpl*, unsigned index);
-    size_t findIgnoringCase(const LChar*, unsigned index = 0);
-    ALWAYS_INLINE size_t findIgnoringCase(const char* s, unsigned index = 0) { return findIgnoringCase(reinterpret_cast<const LChar*>(s), index); }
-    WTF_EXPORT_STRING_API size_t findIgnoringCase(StringImpl*, unsigned index = 0);
-
-    WTF_EXPORT_STRING_API size_t findNextLineStart(unsigned index = UINT_MAX);
-
-    WTF_EXPORT_STRING_API size_t reverseFind(UChar, unsigned index = UINT_MAX);
-    WTF_EXPORT_STRING_API size_t reverseFind(StringImpl*, unsigned index = UINT_MAX);
-    WTF_EXPORT_STRING_API size_t reverseFindIgnoringCase(StringImpl*, unsigned index = UINT_MAX);
-
-    bool startsWith(StringImpl* str, bool caseSensitive = true) { return (caseSensitive ? reverseFind(str, 0) : reverseFindIgnoringCase(str, 0)) == 0; }
-    WTF_EXPORT_STRING_API bool startsWith(UChar) const;
-    WTF_EXPORT_STRING_API bool startsWith(const char*, unsigned matchLength, bool caseSensitive) const;
-    template<unsigned matchLength>
-    bool startsWith(const char (&prefix)[matchLength], bool caseSensitive = true) const { return startsWith(prefix, matchLength - 1, caseSensitive); }
-
-    WTF_EXPORT_STRING_API bool endsWith(StringImpl*, bool caseSensitive = true);
-    WTF_EXPORT_STRING_API bool endsWith(UChar) const;
-    WTF_EXPORT_STRING_API bool endsWith(const char*, unsigned matchLength, bool caseSensitive) const;
-    template<unsigned matchLength>
-    bool endsWith(const char (&prefix)[matchLength], bool caseSensitive = true) const { return endsWith(prefix, matchLength - 1, caseSensitive); }
-
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> replace(UChar, UChar);
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> replace(UChar, StringImpl*);
-    ALWAYS_INLINE PassRefPtr<StringImpl> replace(UChar pattern, const char* replacement, unsigned replacementLength) { return replace(pattern, reinterpret_cast<const LChar*>(replacement), replacementLength); }
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> replace(UChar, const LChar*, unsigned replacementLength);
-    PassRefPtr<StringImpl> replace(UChar, const UChar*, unsigned replacementLength);
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> replace(StringImpl*, StringImpl*);
-    WTF_EXPORT_STRING_API PassRefPtr<StringImpl> replace(unsigned index, unsigned len, StringImpl*);
-
-    WTF_EXPORT_STRING_API WTF::Unicode::Direction defaultWritingDirection(bool* hasStrongDirectionality = 0);
-
-#if USE(CF)
-    RetainPtr<CFStringRef> createCFString();
-#endif
-#ifdef __OBJC__
-    operator NSString*();
-#endif
-
-#ifdef STRING_STATS
-    ALWAYS_INLINE static StringStats& stringStats() { return m_stringStats; }
-#endif
-
-private:
-
-    bool isASCIILiteral() const
-    {
-        return is8Bit() && hasInternalBuffer() && reinterpret_cast<const void*>(m_data8) != reinterpret_cast<const void*>(this + 1);
-    }
-
-    // This number must be at least 2 to avoid sharing empty, null as well as 1 character strings from SmallStrings.
-    static const unsigned s_copyCharsInlineCutOff = 20;
-
-    BufferOwnership bufferOwnership() const { return static_cast<BufferOwnership>(m_hashAndFlags & s_hashMaskBufferOwnership); }
-    template <class UCharPredicate> PassRefPtr<StringImpl> stripMatchedCharacters(UCharPredicate);
-    template <typename CharType, class UCharPredicate> PassRefPtr<StringImpl> simplifyMatchedCharactersToSpace(UCharPredicate);
-    WTF_EXPORT_STRING_API NEVER_INLINE const UChar* getData16SlowCase() const;
-    WTF_EXPORT_PRIVATE NEVER_INLINE unsigned hashSlowCase() const;
-
-    // The bottom bit in the ref count indicates a static (immortal) string.
-    static const unsigned s_refCountFlagIsStaticString = 0x1;
-    static const unsigned s_refCountIncrement = 0x2; // This allows us to ref / deref without disturbing the static string flag.
-
-    // The bottom 8 bits in the hash are flags.
-    static const unsigned s_flagCount = 8;
-    static const unsigned s_flagMask = (1u << s_flagCount) - 1;
-    COMPILE_ASSERT(s_flagCount == StringHasher::flagCount, StringHasher_reserves_enough_bits_for_StringImpl_flags);
-
-    static const unsigned s_hashFlagHas16BitShadow = 1u << 7;
-    static const unsigned s_hashFlag8BitBuffer = 1u << 6;
-    static const unsigned s_hashFlagHasTerminatingNullCharacter = 1u << 5;
-    static const unsigned s_hashFlagIsAtomic = 1u << 4;
-    static const unsigned s_hashFlagDidReportCost = 1u << 3;
-    static const unsigned s_hashFlagIsIdentifier = 1u << 2;
-    static const unsigned s_hashMaskBufferOwnership = 1u | (1u << 1);
-
-#ifdef STRING_STATS
-    WTF_EXPORTDATA static StringStats m_stringStats;
-#endif
-
-public:
-    struct StaticASCIILiteral {
-        // These member variables must match the layout of StringImpl.
-        unsigned m_refCount;
-        unsigned m_length;
-        const LChar* m_data8;
-        const UChar* m_copyData16;
-        unsigned m_hashAndFlags;
-
-        static const unsigned s_initialRefCount = s_refCountFlagIsStaticString;
-        static const unsigned s_initialFlags = s_hashFlag8BitBuffer | s_hashFlagHas16BitShadow | BufferInternal | s_hashFlagHasTerminatingNullCharacter;
-        static const unsigned s_hashShift = s_flagCount;
-    };
-
-#ifndef NDEBUG
-    void assertHashIsCorrect()
-    {
-        ASSERT(hasHash());
-        ASSERT(existingHash() == StringHasher::computeHashAndMaskTop8Bits(characters8(), length()));
-    }
-#endif
-
-private:
-    // These member variables must match the layout of StaticASCIILiteral.
-    unsigned m_refCount;
-    unsigned m_length;
-    union {
-        const LChar* m_data8;
-        const UChar* m_data16;
-    };
-    union {
-        void* m_buffer;
-        StringImpl* m_substringBuffer;
-        mutable UChar* m_copyData16;
-    };
-    mutable unsigned m_hashAndFlags;
-};
-
-COMPILE_ASSERT(sizeof(StringImpl) == sizeof(StringImpl::StaticASCIILiteral), StringImpl_should_match_its_StaticASCIILiteral);
-
-#if !ASSERT_DISABLED
-// StringImpls created from StaticASCIILiteral will ASSERT
-// in the generic ValueCheck<T>::checkConsistency
-// as they are not allocated by fastMalloc.
-// We don't currently have any way to detect that case
-// so we ignore the consistency check for all StringImpl*.
-template<> struct
-ValueCheck<StringImpl*> {
-    static void checkConsistency(const StringImpl*) { }
-};
-#endif
-
-template <>
-ALWAYS_INLINE const LChar* StringImpl::getCharacters<LChar>() const { return characters8(); }
-
-template <>
-ALWAYS_INLINE const UChar* StringImpl::getCharacters<UChar>() const { return characters(); }
-
-WTF_EXPORT_STRING_API bool equal(const StringImpl*, const StringImpl*);
-WTF_EXPORT_STRING_API bool equal(const StringImpl*, const LChar*);
-inline bool equal(const StringImpl* a, const char* b) { return equal(a, reinterpret_cast<const LChar*>(b)); }
-WTF_EXPORT_STRING_API bool equal(const StringImpl*, const LChar*, unsigned);
-inline bool equal(const StringImpl* a, const char* b, unsigned length) { return equal(a, reinterpret_cast<const LChar*>(b), length); }
-inline bool equal(const LChar* a, StringImpl* b) { return equal(b, a); }
-inline bool equal(const char* a, StringImpl* b) { return equal(b, reinterpret_cast<const LChar*>(a)); }
-WTF_EXPORT_STRING_API bool equal(const StringImpl*, const UChar*, unsigned);
-WTF_EXPORT_STRING_API bool equalNonNull(const StringImpl* a, const StringImpl* b);
-
-// Do comparisons 8 or 4 bytes-at-a-time on architectures where it's safe.
-#if CPU(X86_64)
-ALWAYS_INLINE bool equal(const LChar* a, const LChar* b, unsigned length)
-{
-    unsigned dwordLength = length >> 3;
-
-    if (dwordLength) {
-        const uint64_t* aDWordCharacters = reinterpret_cast<const uint64_t*>(a);
-        const uint64_t* bDWordCharacters = reinterpret_cast<const uint64_t*>(b);
-
-        for (unsigned i = 0; i != dwordLength; ++i) {
-            if (*aDWordCharacters++ != *bDWordCharacters++)
-                return false;
-        }
-
-        a = reinterpret_cast<const LChar*>(aDWordCharacters);
-        b = reinterpret_cast<const LChar*>(bDWordCharacters);
-    }
-
-    if (length & 4) {
-        if (*reinterpret_cast<const uint32_t*>(a) != *reinterpret_cast<const uint32_t*>(b))
-            return false;
-
-        a += 4;
-        b += 4;
-    }
-
-    if (length & 2) {
-        if (*reinterpret_cast<const uint16_t*>(a) != *reinterpret_cast<const uint16_t*>(b))
-            return false;
-
-        a += 2;
-        b += 2;
-    }
-
-    if (length & 1 && (*a != *b))
-        return false;
-
-    return true;
-}
-
-ALWAYS_INLINE bool equal(const UChar* a, const UChar* b, unsigned length)
-{
-    unsigned dwordLength = length >> 2;
-    
-    if (dwordLength) {
-        const uint64_t* aDWordCharacters = reinterpret_cast<const uint64_t*>(a);
-        const uint64_t* bDWordCharacters = reinterpret_cast<const uint64_t*>(b);
-
-        for (unsigned i = 0; i != dwordLength; ++i) {
-            if (*aDWordCharacters++ != *bDWordCharacters++)
-                return false;
-        }
-
-        a = reinterpret_cast<const UChar*>(aDWordCharacters);
-        b = reinterpret_cast<const UChar*>(bDWordCharacters);
-    }
-
-    if (length & 2) {
-        if (*reinterpret_cast<const uint32_t*>(a) != *reinterpret_cast<const uint32_t*>(b))
-            return false;
-
-        a += 2;
-        b += 2;
-    }
-
-    if (length & 1 && (*a != *b))
-        return false;
-
-    return true;
-}
-#elif CPU(X86)
-ALWAYS_INLINE bool equal(const LChar* a, const LChar* b, unsigned length)
-{
-    const uint32_t* aCharacters = reinterpret_cast<const uint32_t*>(a);
-    const uint32_t* bCharacters = reinterpret_cast<const uint32_t*>(b);
-
-    unsigned wordLength = length >> 2;
-    for (unsigned i = 0; i != wordLength; ++i) {
-        if (*aCharacters++ != *bCharacters++)
-            return false;
-    }
-
-    length &= 3;
-
-    if (length) {
-        const LChar* aRemainder = reinterpret_cast<const LChar*>(aCharacters);
-        const LChar* bRemainder = reinterpret_cast<const LChar*>(bCharacters);
-        
-        for (unsigned i = 0; i <  length; ++i) {
-            if (aRemainder[i] != bRemainder[i])
-                return false;
-        }
-    }
-
-    return true;
-}
-
-ALWAYS_INLINE bool equal(const UChar* a, const UChar* b, unsigned length)
-{
-    const uint32_t* aCharacters = reinterpret_cast<const uint32_t*>(a);
-    const uint32_t* bCharacters = reinterpret_cast<const uint32_t*>(b);
-    
-    unsigned wordLength = length >> 1;
-    for (unsigned i = 0; i != wordLength; ++i) {
-        if (*aCharacters++ != *bCharacters++)
-            return false;
-    }
-    
-    if (length & 1 && *reinterpret_cast<const UChar*>(aCharacters) != *reinterpret_cast<const UChar*>(bCharacters))
-        return false;
-    
-    return true;
-}
-#else
-ALWAYS_INLINE bool equal(const LChar* a, const LChar* b, unsigned length)
-{
-    for (unsigned i = 0; i != length; ++i) {
-        if (a[i] != b[i])
-            return false;
-    }
-
-    return true;
-}
-
-ALWAYS_INLINE bool equal(const UChar* a, const UChar* b, unsigned length)
-{
-    for (unsigned i = 0; i != length; ++i) {
-        if (a[i] != b[i])
-            return false;
-    }
-
-    return true;
-}
-#endif
-
-ALWAYS_INLINE bool equal(const LChar* a, const UChar* b, unsigned length)
-{
-    for (unsigned i = 0; i != length; ++i) {
-        if (a[i] != b[i])
-            return false;
-    }
-
-    return true;
-}
-
-ALWAYS_INLINE bool equal(const UChar* a, const LChar* b, unsigned length)
-{
-    for (unsigned i = 0; i != length; ++i) {
-        if (a[i] != b[i])
-            return false;
-    }
-
-    return true;
-}
-
-WTF_EXPORT_STRING_API bool equalIgnoringCase(const StringImpl*, const StringImpl*);
-WTF_EXPORT_STRING_API bool equalIgnoringCase(const StringImpl*, const LChar*);
-inline bool equalIgnoringCase(const LChar* a, const StringImpl* b) { return equalIgnoringCase(b, a); }
-WTF_EXPORT_STRING_API bool equalIgnoringCase(const LChar*, const LChar*, unsigned);
-WTF_EXPORT_STRING_API bool equalIgnoringCase(const UChar*, const LChar*, unsigned);
-inline bool equalIgnoringCase(const UChar* a, const char* b, unsigned length) { return equalIgnoringCase(a, reinterpret_cast<const LChar*>(b), length); }
-inline bool equalIgnoringCase(const LChar* a, const UChar* b, unsigned length) { return equalIgnoringCase(b, a, length); }
-inline bool equalIgnoringCase(const char* a, const UChar* b, unsigned length) { return equalIgnoringCase(b, reinterpret_cast<const LChar*>(a), length); }
-inline bool equalIgnoringCase(const char* a, const LChar* b, unsigned length) { return equalIgnoringCase(b, reinterpret_cast<const LChar*>(a), length); }
-inline bool equalIgnoringCase(const UChar* a, const UChar* b, int length)
-{
-    ASSERT(length >= 0);
-    return !Unicode::umemcasecmp(a, b, length);
-}
-WTF_EXPORT_STRING_API bool equalIgnoringCaseNonNull(const StringImpl*, const StringImpl*);
-
-WTF_EXPORT_STRING_API bool equalIgnoringNullity(StringImpl*, StringImpl*);
-
-template<typename CharacterType>
-inline size_t find(const CharacterType* characters, unsigned length, CharacterType matchCharacter, unsigned index = 0)
-{
-    while (index < length) {
-        if (characters[index] == matchCharacter)
-            return index;
-        ++index;
-    }
-    return notFound;
-}
-
-ALWAYS_INLINE size_t find(const UChar* characters, unsigned length, LChar matchCharacter, unsigned index = 0)
-{
-    return find(characters, length, static_cast<UChar>(matchCharacter), index);
-}
-
-inline size_t find(const LChar* characters, unsigned length, UChar matchCharacter, unsigned index = 0)
-{
-    if (matchCharacter & ~0xFF)
-        return notFound;
-    return find(characters, length, static_cast<LChar>(matchCharacter), index);
-}
-
-inline size_t find(const LChar* characters, unsigned length, CharacterMatchFunctionPtr matchFunction, unsigned index = 0)
-{
-    while (index < length) {
-        if (matchFunction(characters[index]))
-            return index;
-        ++index;
-    }
-    return notFound;
-}
-
-inline size_t find(const UChar* characters, unsigned length, CharacterMatchFunctionPtr matchFunction, unsigned index = 0)
-{
-    while (index < length) {
-        if (matchFunction(characters[index]))
-            return index;
-        ++index;
-    }
-    return notFound;
-}
-
-template<typename CharacterType>
-inline size_t findNextLineStart(const CharacterType* characters, unsigned length, unsigned index = 0)
-{
-    while (index < length) {
-        CharacterType c = characters[index++];
-        if ((c != '\n') && (c != '\r'))
-            continue;
-
-        // There can only be a start of a new line if there are more characters
-        // beyond the current character.
-        if (index < length) {
-            // The 3 common types of line terminators are 1. \r\n (Windows), 
-            // 2. \r (old MacOS) and 3. \n (Unix'es).
-
-            if (c == '\n')
-                return index; // Case 3: just \n.
-
-            CharacterType c2 = characters[index];
-            if (c2 != '\n')
-                return index; // Case 2: just \r.
-
-            // Case 1: \r\n.
-            // But, there's only a start of a new line if there are more
-            // characters beyond the \r\n.
-            if (++index < length)
-                return index; 
-        }
-    }
-    return notFound;
-}
-
-template<typename CharacterType>
-inline size_t reverseFindLineTerminator(const CharacterType* characters, unsigned length, unsigned index = UINT_MAX)
-{
-    if (!length)
-        return notFound;
-    if (index >= length)
-        index = length - 1;
-    CharacterType c = characters[index];
-    while ((c != '\n') && (c != '\r')) {
-        if (!index--)
-            return notFound;
-        c = characters[index];
-    }
-    return index;
-}
-
-template<typename CharacterType>
-inline size_t reverseFind(const CharacterType* characters, unsigned length, CharacterType matchCharacter, unsigned index = UINT_MAX)
-{
-    if (!length)
-        return notFound;
-    if (index >= length)
-        index = length - 1;
-    while (characters[index] != matchCharacter) {
-        if (!index--)
-            return notFound;
-    }
-    return index;
-}
-
-ALWAYS_INLINE size_t reverseFind(const UChar* characters, unsigned length, LChar matchCharacter, unsigned index = UINT_MAX)
-{
-    return reverseFind(characters, length, static_cast<UChar>(matchCharacter), index);
-}
-
-inline size_t reverseFind(const LChar* characters, unsigned length, UChar matchCharacter, unsigned index = UINT_MAX)
-{
-    if (matchCharacter & ~0xFF)
-        return notFound;
-    return reverseFind(characters, length, static_cast<LChar>(matchCharacter), index);
-}
-
-inline size_t StringImpl::find(LChar character, unsigned start)
-{
-    if (is8Bit())
-        return WTF::find(characters8(), m_length, character, start);
-    return WTF::find(characters16(), m_length, character, start);
-}
-
-ALWAYS_INLINE size_t StringImpl::find(char character, unsigned start)
-{
-    return find(static_cast<LChar>(character), start);
-}
-
-inline size_t StringImpl::find(UChar character, unsigned start)
-{
-    if (is8Bit())
-        return WTF::find(characters8(), m_length, character, start);
-    return WTF::find(characters16(), m_length, character, start);
-}
-
-template<size_t inlineCapacity>
-bool equalIgnoringNullity(const Vector<UChar, inlineCapacity>& a, StringImpl* b)
-{
-    if (!b)
-        return !a.size();
-    if (a.size() != b->length())
-        return false;
-    return !memcmp(a.data(), b->characters(), b->length() * sizeof(UChar));
-}
-
-template<typename CharacterType1, typename CharacterType2>
-static inline int codePointCompare(unsigned l1, unsigned l2, const CharacterType1* c1, const CharacterType2* c2)
-{
-    const unsigned lmin = l1 < l2 ? l1 : l2;
-    unsigned pos = 0;
-    while (pos < lmin && *c1 == *c2) {
-        ++c1;
-        ++c2;
-        ++pos;
-    }
-
-    if (pos < lmin)
-        return (c1[0] > c2[0]) ? 1 : -1;
-
-    if (l1 == l2)
-        return 0;
-
-    return (l1 > l2) ? 1 : -1;
-}
-
-static inline int codePointCompare8(const StringImpl* string1, const StringImpl* string2)
-{
-    return codePointCompare(string1->length(), string2->length(), string1->characters8(), string2->characters8());
-}
-
-static inline int codePointCompare16(const StringImpl* string1, const StringImpl* string2)
-{
-    return codePointCompare(string1->length(), string2->length(), string1->characters16(), string2->characters16());
-}
-
-static inline int codePointCompare8To16(const StringImpl* string1, const StringImpl* string2)
-{
-    return codePointCompare(string1->length(), string2->length(), string1->characters8(), string2->characters16());
-}
-
-static inline int codePointCompare(const StringImpl* string1, const StringImpl* string2)
-{
-    if (!string1)
-        return (string2 && string2->length()) ? -1 : 0;
-
-    if (!string2)
-        return string1->length() ? 1 : 0;
-
-    bool string1Is8Bit = string1->is8Bit();
-    bool string2Is8Bit = string2->is8Bit();
-    if (string1Is8Bit) {
-        if (string2Is8Bit)
-            return codePointCompare8(string1, string2);
-        return codePointCompare8To16(string1, string2);
-    }
-    if (string2Is8Bit)
-        return -codePointCompare8To16(string2, string1);
-    return codePointCompare16(string1, string2);
-}
-
-static inline bool isSpaceOrNewline(UChar c)
-{
-    // Use isASCIISpace() for basic Latin-1.
-    // This will include newlines, which aren't included in Unicode DirWS.
-    return c <= 0x7F ? WTF::isASCIISpace(c) : WTF::Unicode::direction(c) == WTF::Unicode::WhiteSpaceNeutral;
-}
-
-inline PassRefPtr<StringImpl> StringImpl::isolatedCopy() const
-{
-    if (isASCIILiteral())
-        return StringImpl::createFromLiteral(reinterpret_cast<const char*>(m_data8), m_length);
-    if (is8Bit())
-        return create(m_data8, m_length);
-    return create(m_data16, m_length);
-}
-
-struct StringHash;
-
-// StringHash is the default hash for StringImpl* and RefPtr<StringImpl>
-template<typename T> struct DefaultHash;
-template<> struct DefaultHash<StringImpl*> {
-    typedef StringHash Hash;
-};
-template<> struct DefaultHash<RefPtr<StringImpl> > {
-    typedef StringHash Hash;
-};
-
-}
-
-using WTF::StringImpl;
-using WTF::equal;
-using WTF::equalNonNull;
-using WTF::TextCaseSensitivity;
-using WTF::TextCaseSensitive;
-using WTF::TextCaseInsensitive;
-
-#endif