author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 17:13:44 +0300 | |
branch | RCL_3 |
changeset 70 | 8bfb9186a8b8 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 1998-2000 Netscape Communications Corporation. |
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* Copyright (C) 2003-6 Apple Computer |
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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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#define ARENA_ALIGN_MASK 3 |
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namespace WebCore { |
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typedef unsigned long uword; |
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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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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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#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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_a->avail = _q; \ |
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p = (void *)_p; |
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#define ARENA_GROW(p, pool, size, incr) \ |
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Arena *_a = (pool)->current; \ |
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unsigned int _incr = ARENA_ALIGN(pool, incr); \ |
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uword _p = _a->avail; \ |
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uword _q = _p + _incr; \ |
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if (_p == (uword)(p) + ARENA_ALIGN(pool, size) && \ |
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_q <= _a->limit) { \ |
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_a->avail = _q; \ |
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} else { \ |
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p = ArenaGrow(pool, p, size, incr); \ |
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} |
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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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|
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#define ARENA_RELEASE(pool, mark) \ |
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char *_m = (char *)(mark); \ |
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Arena *_a = (pool)->current; \ |
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if (UPTRDIFF(_m, _a->base) <= UPTRDIFF(_a->avail, _a->base)) { \ |
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_a->avail = (uword)ARENA_ALIGN(pool, _m); \ |
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CLEAR_UNUSED(_a); \ |
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} else { \ |
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ArenaRelease(pool, _m); \ |
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} |
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|
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#define ARENA_DESTROY(pool, a, pnext) \ |
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if ((pool)->current == (a)) (pool)->current = &(pool)->first; \ |
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*(pnext) = (a)->next; \ |
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CLEAR_ARENA(a); \ |
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fastFree(a); \ |
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(a) = 0; |
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|
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} |
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#endif |