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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Damien Doligez, projet Para, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* Automatique. Distributed only by permission. */
/* */
/***********************************************************************/
/* $Id$ */
#ifndef _gc_
#define _gc_
#include "mlvalues.h"
#define White (0 << 8)
#define Gray (1 << 8)
#define Blue (2 << 8)
#define Black (3 << 8)
#define Color_hd(hd) ((color_t) ((hd) & Black))
#define Color_hp(hp) Color_hd (Hd_hp (hp))
#define Is_white_hd(hd) (Color_hd (hd) == White)
#define Is_gray_hd(hd) (Color_hd (hd) == Gray)
#define Is_blue_hd(hd) (Color_hd (hd) == Blue)
#define Is_black_hd(hd) (Color_hd (hd) == Black)
#define Whitehd_hd(hd) (((hd) & ~Black)/*| White*/)
#define Grayhd_hd(hd) (((hd) & ~Black) | Gray)
#define Blackhd_hd(hd) (((hd)/*& ~Black*/)| Black)
#define Bluehd_hd(hd) (((hd) & ~Black) | Blue)
/* This depends on the layout of the header. See [mlvalues.h]. */
#define Make_header(wosize, tag, color) \
((header_t) (((header_t) (wosize) << 10) \
+ (color) \
+ (tag_t) (tag)))
#define Color_val(val) (Color_hd (Hd_val (val)))
#define Is_white_val(val) (Color_val(val) == White)
#define Is_gray_val(val) (Color_val(val) == Gray)
#define Is_blue_val(val) (Color_val(val) == Blue)
#define Is_black_val(val) (Color_val(val) == Black)
#endif /* _gc_ */
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