WebCore/RenderArena.h

   1 /*
   2  * Copyright (C) 2003 Apple Computer, Inc.
   3  *
   4  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  * Alternatively, the contents of this file may be used under the terms
  21  * of either the Mozilla Public License Version 1.1, found at
  22  * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
  23  * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
  24  * (the "GPL"), in which case the provisions of the MPL or the GPL are
  25  * applicable instead of those above.  If you wish to allow use of your
  26  * version of this file only under the terms of one of those two
  27  * licenses (the MPL or the GPL) and not to allow others to use your
  28  * version of this file under the LGPL, indicate your decision by
  29  * deletingthe provisions above and replace them with the notice and
  30  * other provisions required by the MPL or the GPL, as the case may be.
  31  * If you do not delete the provisions above, a recipient may use your
  32  * version of this file under any of the LGPL, the MPL or the GPL.
  33  */
  34
  35 #ifndef RenderArena_h
  36 #define RenderArena_h
  37
  38 #include "Arena.h"
  39
  40 namespace WebCore {
  41
  42 static const size_t gMaxRecycledSize = 400;
  43
  44 class RenderArena {
  45 public:
  46     RenderArena(unsigned arenaSize = 4096);
  47     ~RenderArena();
  48
  49     // Memory management functions
  50     void* allocate(size_t);
  51     void free(size_t, void*);
  52
  53 private:
  54     // Underlying arena pool
  55     ArenaPool m_pool;
  56
  57     // The recycler array is sparse with the indices being multiples of 4,
  58     // i.e., 0, 4, 8, 12, 16, 20, ...
  59     void* m_recyclers[gMaxRecycledSize >> 2];
  60 };
  61
  62 } // namespace WebCore
  63
  64 #endif // RenderArena_h