Replace RenderArena with PartitionAlloc

Source/core/platform/Arena.h

-/*
- * Copyright (C) 1998-2000 Netscape Communications Corporation.
- * Copyright (C) 2003-6 Apple Computer
- * Copyright (C) Research In Motion Limited 2010. All rights reserved.
- *
- * 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
-
-// FIXME: We'd always like to use AllocAlignmentInteger for Arena alignment
-// but there is concern over the memory growth this may cause.
-#ifdef WTF_USE_ARENA_ALLOC_ALIGNMENT_INTEGER
-#define ARENA_ALIGN_MASK (sizeof(WTF::AllocAlignmentInteger) - 1)
-#else
-#define ARENA_ALIGN_MASK 3
-#endif
-
-namespace WebCore {
-
-typedef uintptr_t uword;
-
-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;
-    uword mask;         // Mask (power-of-2 - 1)
-};
-
-void InitArenaPool(ArenaPool*, const char* name, unsigned int size, unsigned int align);
-void FinishArenaPool(ArenaPool*);
-void* ArenaAllocate(ArenaPool*, unsigned int numBytes, unsigned int& bytesAllocated);
-
-#define ARENA_ALIGN(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, bytesAllocated) \
-    Arena* _a = (pool)->current; \
-    unsigned int _nb = ARENA_ALIGN(nb); \
-    uword _p = _a->avail; \
-    uword _q = _p + _nb; \
-    if (_q > _a->limit) \
-        _p = (uword)ArenaAllocate(pool, _nb, *bytesAllocated); \
-    else \
-        _a->avail = _q; \
-    p = (void*)_p;
-
-}
-
-#endif