File indexing completed on 2024-10-13 12:12:51

 /*
  * Copyright (C) 1998-2000 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Nick Blievers <nickb@adacel.com.au>
  *   Jeff Hostetler <jeff@nerdone.com>
  *   Tom Rini <trini@kernel.crashing.org>
  *   Raffaele Sena <raff@netwinder.org>
  *
  * 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 ARENA_H
 #define ARENA_H
 
 #include <config-khtml.h>
 #include <QtGlobal>
 
 // VG annotations for arenas disabled since still buggy
 #if 0 && HAVE_VALGRIND_MEMCHECK_H && !defined(NDEBUG)
 
 #include <valgrind/memcheck.h>
 #define VALGRIND_SUPPORT
 
 #else
 
 #define VALGRIND_CREATE_MEMPOOL(base, redZone, zeroed)
 #define VALGRIND_DESTROY_MEMPOOL(base)
 #define VALGRIND_MEMPOOL_ALLOC(base, addr, size)
 #define VALGRIND_MEMPOOL_FREE(base, addr)
 
 #endif
 
 #define ARENA_ALIGN_MASK 3
 
 typedef quintptr uword;
 
 namespace khtml
 {
 
 struct Arena {
     Arena *next;    // next arena
     uword base;     // aligned base address
     uword limit;    // end of arena (1+last byte)
     uword avail;    // points to next available byte in arena
 };
 
 struct ArenaPool {
     Arena first;    // first arena in pool list.
     Arena *current;     // current arena.
     unsigned int arenasize;
     unsigned int largealloc; // threshold for fractional allocation strategy
     unsigned int cumul; // total bytes in pool.
     uword mask;     // Mask (power-of-2 - 1)
 };
 
 void InitArenaPool(ArenaPool *pool, const char *name,
                    unsigned int size, unsigned int align);
 void FinishArenaPool(ArenaPool *pool);
 void FreeArenaPool(ArenaPool *pool);
 void *ArenaAllocate(ArenaPool *pool, unsigned int nb);
 void ArenaFinish(void);
 
 #define ARENA_ALIGN(pool, n) (((uword)(n) + ARENA_ALIGN_MASK) & ~ARENA_ALIGN_MASK)
 #define INIT_ARENA_POOL(pool, name, size) \
     InitArenaPool(pool, name, size, ARENA_ALIGN_MASK + 1)
 
 #define ARENA_ALLOCATE(p, pool, nb) \
     Arena *_a = (pool)->current; \
     unsigned int _nb = ARENA_ALIGN(pool, nb); \
     uword _p = _a->avail; \
     uword _q = _p + _nb; \
     if (_q > _a->limit) \
         _p = (uword)ArenaAllocate(pool, _nb); \
     else { \
         VALGRIND_MEMPOOL_ALLOC(_a->base, _p, _nb); \
         _a->avail = _q; \
     } \
     p = (void *)_p;
 
 #define ARENA_MARK(pool) ((void *) (pool)->current->avail)
 #define UPTRDIFF(p,q) ((uword)(p) - (uword)(q))
 
 #ifdef DEBUG
 #define FREE_PATTERN 0xDA
 #define CLEAR_UNUSED(a) (assert((a)->avail <= (a)->limit), \
                          memset((void*)(a)->avail, FREE_PATTERN, \
                                 (a)->limit - (a)->avail))
 #define CLEAR_ARENA(a)  memset((void*)(a), FREE_PATTERN, \
                                (a)->limit - (uword)(a))
 #else
 #define CLEAR_UNUSED(a)
 #define CLEAR_ARENA(a)
 #endif
 
 } // namespace
 
 #endif