src/alloc.h

   1 /*
   2  * Copyright (C) 2003, 2004, 2005, 2006, 2007
   3  * Robert Lougher <rob@lougher.org.uk>.
   4  *
   5  * This file is part of JamVM.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2,
  10  * or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  */
  21
  22 #define HEADER_SIZE             sizeof(uintptr_t)
  23 #define LOG_OBJECT_GRAIN        3
  24 #define FLC_BIT                 2
  25
  26 #define HDR_ADDRESS(obj) (uintptr_t*)(((char*)obj)-HEADER_SIZE)
  27
  28 #define clearFlcBit(obj) {                      \
  29         uintptr_t *hdr_addr = HDR_ADDRESS(obj); \
  30         *hdr_addr &= ~FLC_BIT;                  \
  31         MBARRIER();                             \
  32 }
  33
  34 #define setFlcBit(obj) {                        \
  35         uintptr_t *hdr_addr = HDR_ADDRESS(obj); \
  36         *hdr_addr |= FLC_BIT;                   \
  37         MBARRIER();                             \
  38 }
  39
  40 #define testFlcBit(obj) *HDR_ADDRESS(obj) & FLC_BIT