--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/platform/Arena.h	Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 1998-2000 Netscape Communications Corporation.
+ * Copyright (C) 2003-6 Apple Computer
+ *
+ * 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
+
+#define ARENA_ALIGN_MASK 3
+
+namespace WebCore {
+
+typedef unsigned long 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 *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);
+
+#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 \
+            _a->avail = _q; \
+        p = (void *)_p;
+
+#define ARENA_GROW(p, pool, size, incr) \
+        Arena *_a = (pool)->current; \
+        unsigned int _incr = ARENA_ALIGN(pool, incr); \
+        uword _p = _a->avail; \
+        uword _q = _p + _incr; \
+        if (_p == (uword)(p) + ARENA_ALIGN(pool, size) && \
+            _q <= _a->limit) { \
+            _a->avail = _q; \
+        } else { \
+            p = ArenaGrow(pool, p, size, incr); \
+        }
+
+#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
+
+#define ARENA_RELEASE(pool, mark) \
+         char *_m = (char *)(mark); \
+         Arena *_a = (pool)->current; \
+         if (UPTRDIFF(_m, _a->base) <= UPTRDIFF(_a->avail, _a->base)) { \
+             _a->avail = (uword)ARENA_ALIGN(pool, _m); \
+             CLEAR_UNUSED(_a); \
+         } else { \
+             ArenaRelease(pool, _m); \
+         }
+
+#define ARENA_DESTROY(pool, a, pnext) \
+         if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
+         *(pnext) = (a)->next; \
+         CLEAR_ARENA(a); \
+         fastFree(a); \
+         (a) = 0;
+
+}
+
+#endif