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+/*
+ * 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
+ *     notice, this list of conditions and the following disclaimer.
+ * 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
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ArenaTestHelpers_h
+#define ArenaTestHelpers_h
+
+#include "PODArena.h"
+#include <gtest/gtest.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_GE(slot, 0);
+        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