Source/wtf/MemoryInstrumentationSequence.h

/*
 * Copyright (C) 2012 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER 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,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef MemoryInstrumentationSequence_h
#define MemoryInstrumentationSequence_h

#include "wtf/MemoryInstrumentation.h"
#include "wtf/TypeTraits.h"

namespace WTF {

template <typename T> struct NotConvertibleToInteger {
};

// Default implementation with integer type filter.
template<typename ValueType>
struct SequenceMemoryInstrumentationTraits {
    template <typename I> static void reportMemoryUsage(I begin, I end, MemoryClassInfo& info)
    {
        // Check if type is convertible to integer to handle iteration through enum values.
        typedef SequenceMemoryInstrumentationTraits<typename Conditional<IsConvertibleToInteger<ValueType>::value, int, NotConvertibleToInteger<ValueType> >::Type> SequenceTraits;
        SequenceTraits::reportMemoryUsage(begin, end, info);
    }

};

// Specialization for the types which can't be converted to int.
template<typename ValueType>
struct SequenceMemoryInstrumentationTraits<NotConvertibleToInteger<ValueType> > {
    template <typename I>
    static void reportMemoryUsage(I iterator, I end, MemoryClassInfo& info)
    {
        while (iterator != end) {
            info.addMember(*iterator, "item");
            ++iterator;
        }
    }
};

template<> struct SequenceMemoryInstrumentationTraits<int> {
    template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
};

template<> struct SequenceMemoryInstrumentationTraits<void*> {
    template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
};

template<> struct SequenceMemoryInstrumentationTraits<char*> {
    template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
};

template<> struct SequenceMemoryInstrumentationTraits<const char*> {
    template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
};

template<> struct SequenceMemoryInstrumentationTraits<const void*> {
    template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
};

}

#endif // !defined(MemoryInstrumentationSequence_h)