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-rw-r--r--JavaScriptCore/wtf/HashFunctions.h183
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diff --git a/JavaScriptCore/wtf/HashFunctions.h b/JavaScriptCore/wtf/HashFunctions.h
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--- a/JavaScriptCore/wtf/HashFunctions.h
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-/*
- * Copyright (C) 2005, 2006, 2008 Apple 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 WTF_HashFunctions_h
-#define WTF_HashFunctions_h
-
-#include "RefPtr.h"
-#include <stdint.h>
-
-namespace WTF {
-
- template<size_t size> struct IntTypes;
- template<> struct IntTypes<1> { typedef int8_t SignedType; typedef uint8_t UnsignedType; };
- template<> struct IntTypes<2> { typedef int16_t SignedType; typedef uint16_t UnsignedType; };
- template<> struct IntTypes<4> { typedef int32_t SignedType; typedef uint32_t UnsignedType; };
- template<> struct IntTypes<8> { typedef int64_t SignedType; typedef uint64_t UnsignedType; };
-
- // integer hash function
-
- // Thomas Wang's 32 Bit Mix Function: http://www.cris.com/~Ttwang/tech/inthash.htm
- inline unsigned intHash(uint8_t key8)
- {
- unsigned key = key8;
- key += ~(key << 15);
- key ^= (key >> 10);
- key += (key << 3);
- key ^= (key >> 6);
- key += ~(key << 11);
- key ^= (key >> 16);
- return key;
- }
-
- // Thomas Wang's 32 Bit Mix Function: http://www.cris.com/~Ttwang/tech/inthash.htm
- inline unsigned intHash(uint16_t key16)
- {
- unsigned key = key16;
- key += ~(key << 15);
- key ^= (key >> 10);
- key += (key << 3);
- key ^= (key >> 6);
- key += ~(key << 11);
- key ^= (key >> 16);
- return key;
- }
-
- // Thomas Wang's 32 Bit Mix Function: http://www.cris.com/~Ttwang/tech/inthash.htm
- inline unsigned intHash(uint32_t key)
- {
- key += ~(key << 15);
- key ^= (key >> 10);
- key += (key << 3);
- key ^= (key >> 6);
- key += ~(key << 11);
- key ^= (key >> 16);
- return key;
- }
-
- // Thomas Wang's 64 bit Mix Function: http://www.cris.com/~Ttwang/tech/inthash.htm
- inline unsigned intHash(uint64_t key)
- {
- key += ~(key << 32);
- key ^= (key >> 22);
- key += ~(key << 13);
- key ^= (key >> 8);
- key += (key << 3);
- key ^= (key >> 15);
- key += ~(key << 27);
- key ^= (key >> 31);
- return static_cast<unsigned>(key);
- }
-
- template<typename T> struct IntHash {
- static unsigned hash(T key) { return intHash(static_cast<typename IntTypes<sizeof(T)>::UnsignedType>(key)); }
- static bool equal(T a, T b) { return a == b; }
- static const bool safeToCompareToEmptyOrDeleted = true;
- };
-
- template<typename T> struct FloatHash {
- static unsigned hash(T key)
- {
- union {
- T key;
- typename IntTypes<sizeof(T)>::UnsignedType bits;
- } u;
- u.key = key;
- return intHash(u.bits);
- }
- static bool equal(T a, T b) { return a == b; }
- static const bool safeToCompareToEmptyOrDeleted = true;
- };
-
- // pointer identity hash function
-
- template<typename T> struct PtrHash {
- static unsigned hash(T key)
- {
-#if COMPILER(MSVC)
-#pragma warning(push)
-#pragma warning(disable: 4244) // work around what seems to be a bug in MSVC's conversion warnings
-#endif
- return IntHash<uintptr_t>::hash(reinterpret_cast<uintptr_t>(key));
-#if COMPILER(MSVC)
-#pragma warning(pop)
-#endif
- }
- static bool equal(T a, T b) { return a == b; }
- static const bool safeToCompareToEmptyOrDeleted = true;
- };
- template<typename P> struct PtrHash<RefPtr<P> > : PtrHash<P*> {
- using PtrHash<P*>::hash;
- static unsigned hash(const RefPtr<P>& key) { return hash(key.get()); }
- using PtrHash<P*>::equal;
- static bool equal(const RefPtr<P>& a, const RefPtr<P>& b) { return a == b; }
- static bool equal(P* a, const RefPtr<P>& b) { return a == b; }
- static bool equal(const RefPtr<P>& a, P* b) { return a == b; }
- };
-
- // default hash function for each type
-
- template<typename T> struct DefaultHash;
-
- template<typename T, typename U> struct PairHash {
- static unsigned hash(const std::pair<T, U>& p)
- {
- return intHash((static_cast<uint64_t>(DefaultHash<T>::Hash::hash(p.first)) << 32 | DefaultHash<U>::Hash::hash(p.second)));
- }
- static bool equal(const std::pair<T, U>& a, const std::pair<T, U>& b)
- {
- return DefaultHash<T>::Hash::equal(a.first, b.first) && DefaultHash<U>::Hash::equal(a.second, b.second);
- }
- static const bool safeToCompareToEmptyOrDeleted = DefaultHash<T>::Hash::safeToCompareToEmptyOrDeleted
- && DefaultHash<U>::Hash::safeToCompareToEmptyOrDeleted;
- };
-
- // make IntHash the default hash function for many integer types
-
- template<> struct DefaultHash<short> { typedef IntHash<unsigned> Hash; };
- template<> struct DefaultHash<unsigned short> { typedef IntHash<unsigned> Hash; };
- template<> struct DefaultHash<int> { typedef IntHash<unsigned> Hash; };
- template<> struct DefaultHash<unsigned> { typedef IntHash<unsigned> Hash; };
- template<> struct DefaultHash<long> { typedef IntHash<unsigned long> Hash; };
- template<> struct DefaultHash<unsigned long> { typedef IntHash<unsigned long> Hash; };
- template<> struct DefaultHash<long long> { typedef IntHash<unsigned long long> Hash; };
- template<> struct DefaultHash<unsigned long long> { typedef IntHash<unsigned long long> Hash; };
-
-#if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
- template<> struct DefaultHash<wchar_t> { typedef IntHash<wchar_t> Hash; };
-#endif
-
- template<> struct DefaultHash<float> { typedef FloatHash<float> Hash; };
- template<> struct DefaultHash<double> { typedef FloatHash<double> Hash; };
-
- // make PtrHash the default hash function for pointer types that don't specialize
-
- template<typename P> struct DefaultHash<P*> { typedef PtrHash<P*> Hash; };
- template<typename P> struct DefaultHash<RefPtr<P> > { typedef PtrHash<RefPtr<P> > Hash; };
-
- template<typename T, typename U> struct DefaultHash<std::pair<T, U> > { typedef PairHash<T, U> Hash; };
-
-} // namespace WTF
-
-using WTF::DefaultHash;
-using WTF::IntHash;
-using WTF::PtrHash;
-
-#endif // WTF_HashFunctions_h
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