khtml/rendering/render_arena.h

   1 /*
   2  * Copyright (C) 2002 Apple Computer, Inc.
   3  * Copyright (C) 2003 Dirk Mueller (mueller@kde.org)
   4  *
   5  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  * Alternatively, the contents of this file may be used under the terms
  22  * of either the Mozilla Public License Version 1.1, found at
  23  * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
  24  * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
  25  * (the "GPL"), in which case the provisions of the MPL or the GPL are
  26  * applicable instead of those above.  If you wish to allow use of your
  27  * version of this file only under the terms of one of those two
  28  * licenses (the MPL or the GPL) and not to allow others to use your
  29  * version of this file under the LGPL, indicate your decision by
  30  * deletingthe provisions above and replace them with the notice and
  31  * other provisions required by the MPL or the GPL, as the case may be.
  32  * If you do not delete the provisions above, a recipient may use your
  33  * version of this file under any of the LGPL, the MPL or the GPL.
  34  */
  35
  36 #ifndef RENDERARENA_H
  37 #define RENDERARENA_H
  38
  39 #define KHTML_USE_ARENA_ALLOCATOR
  40
  41 #include "misc/arena.h"
  42 #include "misc/shared.h"
  43
  44 #include <stdlib.h>
  45
  46 namespace khtml {
  47
  48 #define KHTML_MAX_RECYCLED_SIZE 400
  49 #define KHTML_ROUNDUP(x,y) ((((x)+((y)-1))/(y))*(y))
  50
  51 class RenderArena: public Shared<RenderArena> {
  52 public:
  53    RenderArena(unsigned int arenaSize = 4096);
  54     ~RenderArena();
  55
  56   // Memory management functions
  57   void* allocate(size_t size);
  58   void  free(size_t size, void* ptr);
  59
  60 private:
  61   // Underlying arena pool
  62   ArenaPool m_pool;
  63
  64   // The recycler array is sparse with the indices being multiples of 4,
  65   // i.e., 0, 4, 8, 12, 16, 20, ...
  66   void* m_recyclers[KHTML_MAX_RECYCLED_SIZE >> 2];
  67 };
  68
  69
  70 } // namespace
  71
  72
  73 #endif
  74