/*
** vim: ts=4 sw=4 expandtab
*/
/*
** Copyright (C) 1995-1998,2000-2001, 2005-2006 The University of Melbourne.
** This file may only be copied under the terms of the GNU Library General
** Public License - see the file COPYING.LIB in the Mercury distribution.
*/

/* mercury_overflow.h - definitions for overflow checks */

#ifndef MERCURY_OVERFLOW_H
#define MERCURY_OVERFLOW_H

#ifndef MR_CHECK_FOR_OVERFLOW

#define MR_heap_overflow_check()            ((void) 0)
#define MR_detstack_overflow_check()        ((void) 0)
#define MR_detstack_underflow_check()       ((void) 0)
#define MR_nondetstack_overflow_check()     ((void) 0)
#define MR_nondetstack_underflow_check()    ((void) 0)

#else /* MR_CHECK_FOR_OVERFLOW */

#include "mercury_regs.h"
#include "mercury_misc.h"   /* for MR_fatal_error() */

#define MR_heap_overflow_check()                                             \
    (                                                                        \
        MR_IF (MR_hp >= MR_ENGINE(MR_eng_heap_zone)->MR_zone_top,(           \
            MR_fatal_error("heap overflow")                                  \
        )),                                                                  \
        MR_IF (MR_hp > MR_ENGINE(MR_eng_heap_zone)->MR_zone_max,(            \
            MR_ENGINE(MR_eng_heap_zone)->MR_zone_max = MR_hp                 \
        )),                                                                  \
        (void)0                                                              \
    )

#define MR_detstack_overflow_check()                                         \
    (                                                                        \
        MR_IF (MR_sp >= MR_CONTEXT(MR_ctxt_detstack_zone)->MR_zone_top,(     \
            MR_fatal_error("stack overflow")                                 \
        )),                                                                  \
        MR_IF (MR_sp > MR_CONTEXT(MR_ctxt_detstack_zone)->MR_zone_max,(      \
            MR_CONTEXT(MR_ctxt_detstack_zone)->MR_zone_max = MR_sp           \
        )),                                                                  \
        (void)0                                                              \
    )

#define MR_detstack_underflow_check()                                        \
    (                                                                        \
        MR_IF (MR_sp < MR_CONTEXT(MR_ctxt_detstack_zone)->MR_zone_min,(      \
            MR_fatal_error("stack underflow")                                \
        )),                                                                  \
        (void)0                                                              \
    )

#define MR_nondetstack_overflow_check()                                      \
    (                                                                        \
        MR_IF (MR_maxfr >= MR_CONTEXT(MR_ctxt_nondetstack_zone)->MR_zone_top,( \
            MR_fatal_error("nondetstack overflow")                           \
        )),                                                                  \
        MR_IF (MR_maxfr > MR_CONTEXT(MR_ctxt_nondetstack_zone)->MR_zone_max,( \
            MR_CONTEXT(MR_ctxt_nondetstack_zone)->MR_zone_max = MR_maxfr     \
        )),                                                                  \
        (void)0                                                              \
    )

#define MR_nondetstack_underflow_check()                                     \
    (                                                                        \
        MR_IF (MR_maxfr < MR_CONTEXT(MR_ctxt_nondetstack_zone)->MR_zone_min,( \
            MR_fatal_error("nondetstack underflow")                          \
        )),                                                                  \
        (void)0                                                              \
    )

#endif /* MR_CHECK_FOR_OVERFLOW */

#endif /* not MERCURY_OVERFLOW_H */