Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 410 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/wtf/HashMap.h b/Source/JavaScriptCore/wtf/HashMap.h
new file mode 100644
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+++ b/Source/JavaScriptCore/wtf/HashMap.h
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+/*
+ * Copyright (C) 2005, 2006, 2007, 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_HashMap_h
+#define WTF_HashMap_h
+
+#include "HashTable.h"
+
+namespace WTF {
+
+    template<typename PairType> struct PairFirstExtractor;
+
+    template<typename KeyArg, typename MappedArg, typename HashArg = typename DefaultHash<KeyArg>::Hash,
+        typename KeyTraitsArg = HashTraits<KeyArg>, typename MappedTraitsArg = HashTraits<MappedArg> >
+    class HashMap : public FastAllocBase {
+    private:
+        typedef KeyTraitsArg KeyTraits;
+        typedef MappedTraitsArg MappedTraits;
+        typedef PairHashTraits<KeyTraits, MappedTraits> ValueTraits;
+
+    public:
+        typedef typename KeyTraits::TraitType KeyType;
+        typedef typename MappedTraits::TraitType MappedType;
+        typedef typename ValueTraits::TraitType ValueType;
+
+    private:
+        typedef HashArg HashFunctions;
+
+        typedef HashTable<KeyType, ValueType, PairFirstExtractor<ValueType>,
+            HashFunctions, ValueTraits, KeyTraits> HashTableType;
+
+    public:
+        typedef HashTableIteratorAdapter<HashTableType, ValueType> iterator;
+        typedef HashTableConstIteratorAdapter<HashTableType, ValueType> const_iterator;
+
+        void swap(HashMap&);
+
+        int size() const;
+        int capacity() const;
+        bool isEmpty() const;
+
+        // iterators iterate over pairs of keys and values
+        iterator begin();
+        iterator end();
+        const_iterator begin() const;
+        const_iterator end() const;
+
+        iterator find(const KeyType&);
+        const_iterator find(const KeyType&) const;
+        bool contains(const KeyType&) const;
+        MappedType get(const KeyType&) const;
+
+        // replaces value but not key if key is already present
+        // return value is a pair of the iterator to the key location, 
+        // and a boolean that's true if a new value was actually added
+        pair<iterator, bool> set(const KeyType&, const MappedType&); 
+
+        // does nothing if key is already present
+        // return value is a pair of the iterator to the key location, 
+        // and a boolean that's true if a new value was actually added
+        pair<iterator, bool> add(const KeyType&, const MappedType&); 
+
+        void remove(const KeyType&);
+        void remove(iterator);
+        void clear();
+
+        MappedType take(const KeyType&); // efficient combination of get with remove
+
+        // An alternate version of find() that finds the object by hashing and comparing
+        // with some other type, to avoid the cost of type conversion. HashTranslator
+        // must have the following function members:
+        //   static unsigned hash(const T&);
+        //   static bool equal(const ValueType&, const T&);
+        template<typename T, typename HashTranslator> iterator find(const T&);
+        template<typename T, typename HashTranslator> const_iterator find(const T&) const;
+        template<typename T, typename HashTranslator> bool contains(const T&) const;
+
+        // An alternate version of add() that finds the object by hashing and comparing
+        // with some other type, to avoid the cost of type conversion if the object is already
+        // in the table. HashTranslator must have the following function members:
+        //   static unsigned hash(const T&);
+        //   static bool equal(const ValueType&, const T&);
+        //   static translate(ValueType&, const T&, unsigned hashCode);
+        template<typename T, typename HashTranslator> pair<iterator, bool> add(const T&, const MappedType&);
+
+        void checkConsistency() const;
+
+    private:
+        pair<iterator, bool> inlineAdd(const KeyType&, const MappedType&);
+
+        HashTableType m_impl;
+    };
+
+    template<typename PairType> struct PairFirstExtractor {
+        static const typename PairType::first_type& extract(const PairType& p) { return p.first; }
+    };
+
+    template<typename ValueType, typename ValueTraits, typename HashFunctions>
+    struct HashMapTranslator {
+        typedef typename ValueType::first_type KeyType;
+        typedef typename ValueType::second_type MappedType;
+
+        static unsigned hash(const KeyType& key) { return HashFunctions::hash(key); }
+        static bool equal(const KeyType& a, const KeyType& b) { return HashFunctions::equal(a, b); }
+        static void translate(ValueType& location, const KeyType& key, const MappedType& mapped)
+        {
+            location.first = key;
+            location.second = mapped;
+        }
+    };
+
+    template<typename ValueType, typename ValueTraits, typename T, typename Translator>
+    struct HashMapTranslatorAdapter {
+        typedef typename ValueType::first_type KeyType;
+        typedef typename ValueType::second_type MappedType;
+
+        static unsigned hash(const T& key) { return Translator::hash(key); }
+        static bool equal(const KeyType& a, const T& b) { return Translator::equal(a, b); }
+        static void translate(ValueType& location, const T& key, const MappedType& mapped, unsigned hashCode)
+        {
+            Translator::translate(location.first, key, hashCode);
+            location.second = mapped;
+        }
+    };
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void HashMap<T, U, V, W, X>::swap(HashMap& other)
+    {
+        m_impl.swap(other.m_impl); 
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline int HashMap<T, U, V, W, X>::size() const
+    {
+        return m_impl.size(); 
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline int HashMap<T, U, V, W, X>::capacity() const
+    { 
+        return m_impl.capacity(); 
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline bool HashMap<T, U, V, W, X>::isEmpty() const
+    {
+        return m_impl.isEmpty();
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline typename HashMap<T, U, V, W, X>::iterator HashMap<T, U, V, W, X>::begin()
+    {
+        return m_impl.begin();
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline typename HashMap<T, U, V, W, X>::iterator HashMap<T, U, V, W, X>::end()
+    {
+        return m_impl.end();
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline typename HashMap<T, U, V, W, X>::const_iterator HashMap<T, U, V, W, X>::begin() const
+    {
+        return m_impl.begin();
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline typename HashMap<T, U, V, W, X>::const_iterator HashMap<T, U, V, W, X>::end() const
+    {
+        return m_impl.end();
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline typename HashMap<T, U, V, W, X>::iterator HashMap<T, U, V, W, X>::find(const KeyType& key)
+    {
+        return m_impl.find(key);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline typename HashMap<T, U, V, W, X>::const_iterator HashMap<T, U, V, W, X>::find(const KeyType& key) const
+    {
+        return m_impl.find(key);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline bool HashMap<T, U, V, W, X>::contains(const KeyType& key) const
+    {
+        return m_impl.contains(key);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    template<typename TYPE, typename HashTranslator>
+    inline typename HashMap<T, U, V, W, X>::iterator
+    HashMap<T, U, V, W, X>::find(const TYPE& value)
+    {
+        typedef HashMapTranslatorAdapter<ValueType, ValueTraits, TYPE, HashTranslator> Adapter;
+        return m_impl.template find<TYPE, Adapter>(value);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    template<typename TYPE, typename HashTranslator>
+    inline typename HashMap<T, U, V, W, X>::const_iterator 
+    HashMap<T, U, V, W, X>::find(const TYPE& value) const
+    {
+        typedef HashMapTranslatorAdapter<ValueType, ValueTraits, TYPE, HashTranslator> Adapter;
+        return m_impl.template find<TYPE, Adapter>(value);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    template<typename TYPE, typename HashTranslator>
+    inline bool
+    HashMap<T, U, V, W, X>::contains(const TYPE& value) const
+    {
+        typedef HashMapTranslatorAdapter<ValueType, ValueTraits, TYPE, HashTranslator> Adapter;
+        return m_impl.template contains<TYPE, Adapter>(value);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline pair<typename HashMap<T, U, V, W, X>::iterator, bool>
+    HashMap<T, U, V, W, X>::inlineAdd(const KeyType& key, const MappedType& mapped) 
+    {
+        typedef HashMapTranslator<ValueType, ValueTraits, HashFunctions> TranslatorType;
+        return m_impl.template add<KeyType, MappedType, TranslatorType>(key, mapped);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    pair<typename HashMap<T, U, V, W, X>::iterator, bool>
+    HashMap<T, U, V, W, X>::set(const KeyType& key, const MappedType& mapped) 
+    {
+        pair<iterator, bool> result = inlineAdd(key, mapped);
+        if (!result.second) {
+            // add call above didn't change anything, so set the mapped value
+            result.first->second = mapped;
+        }
+        return result;
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    template<typename TYPE, typename HashTranslator>
+    pair<typename HashMap<T, U, V, W, X>::iterator, bool>
+    HashMap<T, U, V, W, X>::add(const TYPE& key, const MappedType& value)
+    {
+        typedef HashMapTranslatorAdapter<ValueType, ValueTraits, TYPE, HashTranslator> Adapter;
+        return m_impl.template addPassingHashCode<TYPE, MappedType, Adapter>(key, value);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    pair<typename HashMap<T, U, V, W, X>::iterator, bool>
+    HashMap<T, U, V, W, X>::add(const KeyType& key, const MappedType& mapped)
+    {
+        return inlineAdd(key, mapped);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename MappedTraits>
+    typename HashMap<T, U, V, W, MappedTraits>::MappedType
+    HashMap<T, U, V, W, MappedTraits>::get(const KeyType& key) const
+    {
+        ValueType* entry = const_cast<HashTableType&>(m_impl).lookup(key);
+        if (!entry)
+            return MappedTraits::emptyValue();
+        return entry->second;
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void HashMap<T, U, V, W, X>::remove(iterator it)
+    {
+        if (it.m_impl == m_impl.end())
+            return;
+        m_impl.internalCheckTableConsistency();
+        m_impl.removeWithoutEntryConsistencyCheck(it.m_impl);
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void HashMap<T, U, V, W, X>::remove(const KeyType& key)
+    {
+        remove(find(key));
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void HashMap<T, U, V, W, X>::clear()
+    {
+        m_impl.clear();
+    }
+
+    template<typename T, typename U, typename V, typename W, typename MappedTraits>
+    typename HashMap<T, U, V, W, MappedTraits>::MappedType
+    HashMap<T, U, V, W, MappedTraits>::take(const KeyType& key)
+    {
+        // This can probably be made more efficient to avoid ref/deref churn.
+        iterator it = find(key);
+        if (it == end())
+            return MappedTraits::emptyValue();
+        typename HashMap<T, U, V, W, MappedTraits>::MappedType result = it->second;
+        remove(it);
+        return result;
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void HashMap<T, U, V, W, X>::checkConsistency() const
+    {
+        m_impl.checkTableConsistency();
+    }
+
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    bool operator==(const HashMap<T, U, V, W, X>& a, const HashMap<T, U, V, W, X>& b)
+    {
+        if (a.size() != b.size())
+            return false;
+
+        typedef typename HashMap<T, U, V, W, X>::const_iterator const_iterator;
+
+        const_iterator end = a.end();
+        const_iterator notFound = b.end();
+        for (const_iterator it = a.begin(); it != end; ++it) {
+            const_iterator bPos = b.find(it->first);
+            if (bPos == notFound || it->second != bPos->second)
+                return false;
+        }
+
+        return true;
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline bool operator!=(const HashMap<T, U, V, W, X>& a, const HashMap<T, U, V, W, X>& b)
+    {
+        return !(a == b);
+    }
+
+    template<typename MappedType, typename HashTableType>
+    void deleteAllPairSeconds(HashTableType& collection)
+    {
+        typedef typename HashTableType::const_iterator iterator;
+        iterator end = collection.end();
+        for (iterator it = collection.begin(); it != end; ++it)
+            delete it->second;
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void deleteAllValues(const HashMap<T, U, V, W, X>& collection)
+    {
+        deleteAllPairSeconds<typename HashMap<T, U, V, W, X>::MappedType>(collection);
+    }
+
+    template<typename KeyType, typename HashTableType>
+    void deleteAllPairFirsts(HashTableType& collection)
+    {
+        typedef typename HashTableType::const_iterator iterator;
+        iterator end = collection.end();
+        for (iterator it = collection.begin(); it != end; ++it)
+            delete it->first;
+    }
+
+    template<typename T, typename U, typename V, typename W, typename X>
+    inline void deleteAllKeys(const HashMap<T, U, V, W, X>& collection)
+    {
+        deleteAllPairFirsts<typename HashMap<T, U, V, W, X>::KeyType>(collection);
+    }
+    
+    template<typename T, typename U, typename V, typename W, typename X, typename Y>
+    inline void copyKeysToVector(const HashMap<T, U, V, W, X>& collection, Y& vector)
+    {
+        typedef typename HashMap<T, U, V, W, X>::const_iterator::Keys iterator;
+        
+        vector.resize(collection.size());
+        
+        iterator it = collection.begin().keys();
+        iterator end = collection.end().keys();
+        for (unsigned i = 0; it != end; ++it, ++i)
+            vector[i] = *it;
+    }  
+
+    template<typename T, typename U, typename V, typename W, typename X, typename Y>
+    inline void copyValuesToVector(const HashMap<T, U, V, W, X>& collection, Y& vector)
+    {
+        typedef typename HashMap<T, U, V, W, X>::const_iterator::Values iterator;
+        
+        vector.resize(collection.size());
+        
+        iterator it = collection.begin().values();
+        iterator end = collection.end().values();
+        for (unsigned i = 0; it != end; ++it, ++i)
+            vector[i] = *it;
+    }   
+
+} // namespace WTF
+
+using WTF::HashMap;
+
+#include "RefPtrHashMap.h"
+
+#endif /* WTF_HashMap_h */