/*
 * Copyright (C) 2010 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:
 *
 * 1.  Redistributions of source code must retain the above copyright
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 * 2.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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#ifndef ArenaTestHelpers_h
#define ArenaTestHelpers_h

#include "PODArena.h"
#include <gtest/gtest.h>
#include <wtf/NotFound.h>
#include <wtf/Vector.h>

namespace WebCore {
namespace ArenaTestHelpers {

// An allocator for the PODArena which tracks the regions which have
// been allocated.
class TrackedAllocator : public PODArena::FastMallocAllocator {
public:
    static PassRefPtr<TrackedAllocator> create()
    {
        return adoptRef(new TrackedAllocator);
    }

    virtual void* allocate(size_t size)
    {
        void* result = PODArena::FastMallocAllocator::allocate(size);
        m_allocatedRegions.append(result);
        return result;
    }

    virtual void free(void* ptr)
    {
        size_t slot = m_allocatedRegions.find(ptr);
        ASSERT_NE(slot, notFound);
        m_allocatedRegions.remove(slot);
        PODArena::FastMallocAllocator::free(ptr);
    }

    bool isEmpty() const
    {
        return !numRegions();
    }

    int numRegions() const
    {
        return m_allocatedRegions.size();
    }

private:
    TrackedAllocator() { }
    Vector<void*> m_allocatedRegions;
};

} // namespace ArenaTestHelpers
} // namespace WebCore

#endif // ArenaTestHelpers_h