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124 lines
4.1 KiB
124 lines
4.1 KiB
15 years ago
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/*
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* Copyright (C) 1998-2000 Netscape Communications Corporation.
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*
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* Other contributors:
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* Nick Blievers <nickb@adacel.com.au>
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* Jeff Hostetler <jeff@nerdone.com>
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* Tom Rini <trini@kernel.crashing.org>
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* Raffaele Sena <raff@netwinder.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Alternatively, the contents of this file may be used under the terms
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* of either the Mozilla Public License Version 1.1, found at
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* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
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* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
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* (the "GPL"), in which case the provisions of the MPL or the GPL are
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* applicable instead of those above. If you wish to allow use of your
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* version of this file only under the terms of one of those two
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* licenses (the MPL or the GPL) and not to allow others to use your
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* version of this file under the LGPL, indicate your decision by
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* deletingthe provisions above and replace them with the notice and
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* other provisions required by the MPL or the GPL, as the case may be.
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* If you do not delete the provisions above, a recipient may use your
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* version of this file under any of the LGPL, the MPL or the GPL.
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*/
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#ifndef ARENA_H
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#define ARENA_H
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#if defined(HAVE_VALGRIND_MEMCHECK_H) && !defined(NDEBUG)
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#include <valgrind/memcheck.h>
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#define VALGRIND_SUPPORT
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#else
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#define VALGRIND_CREATE_MEMPOOL(base, redZone, zeroed)
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#define VALGRIND_DESTROY_MEMPOOL(base)
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#define VALGRIND_MEMPOOL_ALLOC(base, addr, size)
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#define VALGRIND_MEMPOOL_FREE(base, addr)
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#endif
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#define ARENA_ALIGN_MASK 3
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typedef unsigned long uword;
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namespace khtml {
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struct Arena {
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Arena* next; // next arena
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uword base; // aligned base address
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uword limit; // end of arena (1+last byte)
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uword avail; // points to next available byte in arena
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};
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struct ArenaPool {
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Arena first; // first arena in pool list.
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Arena* current; // current arena.
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unsigned int arenasize;
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unsigned int largealloc; // threshold for fractional allocation strategy
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unsigned int cumul; // total bytes in pool.
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uword mask; // Mask (power-of-2 - 1)
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};
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void InitArenaPool(ArenaPool *pool, const char *name,
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unsigned int size, unsigned int align);
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void FinishArenaPool(ArenaPool *pool);
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void FreeArenaPool(ArenaPool *pool);
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void* ArenaAllocate(ArenaPool *pool, unsigned int nb);
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void ArenaFinish(void);
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#define ARENA_ALIGN(pool, n) (((uword)(n) + ARENA_ALIGN_MASK) & ~ARENA_ALIGN_MASK)
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#define INIT_ARENA_POOL(pool, name, size) \
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InitArenaPool(pool, name, size, ARENA_ALIGN_MASK + 1)
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#define ARENA_ALLOCATE(p, pool, nb) \
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Arena *_a = (pool)->current; \
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unsigned int _nb = ARENA_ALIGN(pool, nb); \
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uword _p = _a->avail; \
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uword _q = _p + _nb; \
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if (_q > _a->limit) \
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_p = (uword)ArenaAllocate(pool, _nb); \
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else { \
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VALGRIND_MEMPOOL_ALLOC(_a->base, p, nb); \
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_a->avail = _q; \
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} \
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p = (void *)_p;
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#define ARENA_MARK(pool) ((void *) (pool)->current->avail)
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#define UPTRDIFF(p,q) ((uword)(p) - (uword)(q))
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#ifdef DEBUG
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#define FREE_PATTERN 0xDA
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#define CLEAR_UNUSED(a) (assert((a)->avail <= (a)->limit), \
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memset((void*)(a)->avail, FREE_PATTERN, \
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(a)->limit - (a)->avail))
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#define CLEAR_ARENA(a) memset((void*)(a), FREE_PATTERN, \
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(a)->limit - (uword)(a))
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#else
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#define CLEAR_UNUSED(a)
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#define CLEAR_ARENA(a)
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#endif
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} // namespace
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#endif
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