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/*
Copyright (C) 1994 M. Hagiya, W. Schelter, T. Yuasa
This file is part of GNU Common Lisp, herein referred to as GCL
GCL is free software; you can redistribute it and/or modify it under
the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GCL 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with GCL; see the file COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
bds.h
bind stack
*/
struct bds_bd {
object bds_sym; /* symbol */
object bds_val; /* previous value of the symbol */
};
typedef struct bds_bd *bds_ptr;
extern bds_ptr bds_org,bds_limit;
EXTER bds_ptr bds_top; /* bind stack top */
#ifdef KCLOVM
/* for multiprocessing */
EXTER struct bds_bd save_bind_stack[BDSSIZE + BDSGETA + BDSGETA];
EXTER bds_ptr bds_save_org;
EXTER bds_ptr bds_save_limit;
EXTER bds_ptr bds_save_top;
#endif
#define bds_check \
if (bds_top >= bds_limit) \
bds_overflow()
/* do this so that an interrupt in the middle will leave the VALID
part of the bds stack ie (<= bds_top) in a valid state, so
that a throw out will be ok */
#define bds_bind(sym, val) \
({object _sym=(sym),_val=(val);bds_ptr _b=++bds_top;(_b)->bds_sym=_sym;(_b)->bds_val=_sym->s.s_dbind;_sym->s.s_dbind=_val;})
#define bds_unwind1 \
((bds_top->bds_sym)->s.s_dbind = bds_top->bds_val, --bds_top)
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