text: /*
   * Copyright (C) 2003 Apple Computer, Inc.
   *
   * Portions are Copyright (C) 1998 Netscape Communications Corporation.
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
   *
   * Alternatively, the contents of this file may be used under the terms
   * of either the Mozilla Public License Version 1.1, found at
   * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
   * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
   * (the "GPL"), in which case the provisions of the MPL or the GPL are
   * applicable instead of those above.  If you wish to allow use of your
   * version of this file only under the terms of one of those two
   * licenses (the MPL or the GPL) and not to allow others to use your
   * version of this file under the LGPL, indicate your decision by
   * deletingthe provisions above and replace them with the notice and
   * other provisions required by the MPL or the GPL, as the case may be.
   * If you do not delete the provisions above, a recipient may use your
   * version of this file under any of the LGPL, the MPL or the GPL.
   */
  
  #ifndef RenderArena_h
  #define RenderArena_h
  
  #include "Arena.h"
  #include <wtf/FastAllocBase.h>
  #include <wtf/Noncopyable.h>
  #include <wtf/PassRefPtr.h>
  #include <wtf/RefCounted.h>
  
  namespace WebCore {
  
  static const size_t gMaxRecycledSize = 1024;
  
  class RenderArena : public RefCounted<RenderArena> {
  public:
      static PassRefPtr<RenderArena> create() { return adoptRef(new RenderArena); }
      ~RenderArena();
  
      // Memory management functions
      void* allocate(size_t);
      void free(size_t, void*);
  
      size_t totalRenderArenaSize() const { return m_totalSize; }
      size_t totalRenderArenaAllocatedBytes() const { return m_totalAllocated; }
  
  private:
      RenderArena(unsigned arenaSize = 8192);
      
      // Underlying arena pool
      ArenaPool m_pool;
  
      // The mask used to secure the recycled freelist pointers.
      uintptr_t m_mask;
      // The recycler array is sparse with the indices being multiples of the
      // rounding size, sizeof(void*), i.e., 0, 4, 8, 12, 16, 20, ... on 32-bit.
      static const size_t kRecyclerShift = (sizeof(void*) == 8) ? 3 : 2;
      void* m_recyclers[gMaxRecycledSize >> kRecyclerShift];
  
      size_t m_totalSize;
      size_t m_totalAllocated;
  };
  
  } // namespace WebCore
  
  #endif // RenderArena_h
  