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#include "sys-defines.h"
#include "ode.h"
#include "extern.h"
#define NSTACK 30
double stack[NSTACK];
/*
* expression tree evaluator
* and expression space
* management routines
* Copyright Nicholas B. Tufillaro, 1982-1994. All rights reserved.
* GNU enhancements copyright (C) 1996-1999 Free Software Foundation, Inc.
*/
double
#ifdef _HAVE_PROTOS
eval (const struct expr *ep)
#else
eval (ep)
const struct expr *ep;
#endif
{
double *sp;
double tmp, tmp2;
for (sp = &stack[NSTACK]; ep != NULL; ep = ep->ex_next)
{
#ifdef DEBUG
if (sp > &stack[NSTACK])
panic ("expression stack underflow");
#endif
if (sp <= stack)
panic ("stack overflow -- bump NSTACK and recompile");
switch (ep->ex_oper)
{
case O_CONST:
*--sp = ep->ex_value;
break;
case O_IDENT:
*--sp = ep->ex_sym->sy_value;
break;
case O_PLUS:
tmp = *sp++;
*sp += tmp;
break;
case O_MINUS:
tmp = *sp++;
*sp -= tmp;
break;
case O_MULT:
tmp = *sp++;
*sp *= tmp;
break;
case O_DIV:
tmp = *sp++;
*sp /= tmp;
break;
case O_POWER:
tmp = *sp++;
if ((tmp != (int)tmp) && (*sp < 0))
rterror("negative number to non-integer power");
*sp = pow(*sp,tmp);
break;
case O_SQAR:
*sp *= *sp;
break;
case O_CUBE:
*sp *= *sp * *sp;
break;
case O_INV:
*sp = 1. / *sp;
break;
case O_SQRT:
if (*sp < 0)
rterror("square root of a negative number");
*sp = sqrt(*sp);
break;
case O_SIN:
*sp = sin(*sp);
break;
case O_COS:
*sp = cos(*sp);
break;
case O_TAN:
*sp = tan(*sp);
break;
case O_ASIN:
*sp = asin(*sp);
break;
case O_ACOS:
*sp = acos(*sp);
break;
case O_ATAN:
*sp = atan(*sp);
break;
case O_ABS:
if (*sp < 0)
*sp = -*sp;
break;
case O_EXP:
*sp = exp(*sp);
break;
case O_LOG:
if (*sp <= 0)
rterror("logarithm of non-positive number");
*sp = log(*sp);
break;
case O_LOG10:
if (*sp <= 0)
rterror("logarithm of non-positive number");
*sp = log10(*sp);
break;
case O_SINH:
*sp = sinh(*sp);
break;
case O_COSH:
*sp = cosh(*sp);
break;
case O_TANH:
*sp = tanh(*sp);
break;
case O_ASINH:
*sp = asinh(*sp);
break;
case O_ACOSH:
*sp = acosh(*sp);
break;
case O_ATANH:
*sp = atanh(*sp);
break;
case O_FLOOR:
*sp = floor(*sp);
break;
case O_CEIL:
*sp = ceil(*sp);
break;
case O_J0:
*sp = j0(*sp);
break;
case O_J1:
*sp = j1(*sp);
break;
case O_Y0:
*sp = y0(*sp);
break;
case O_GAMMA:
*sp = f_gamma(*sp);
break;
case O_LGAMMA:
*sp = F_LGAMMA(*sp);
break;
case O_ERFC:
*sp = erfc(*sp);
break;
case O_ERF:
*sp = erf(*sp);
break;
case O_INVERF:
*sp = inverf(*sp);
break;
case O_NORM:
*sp = norm(*sp);
break;
case O_INVNORM:
*sp = invnorm(*sp);
break;
case O_NEG:
*sp = -*sp;
break;
case O_IGAMMA:
tmp = *sp++;
*sp = igamma(*sp, tmp);
break;
case O_IBETA:
tmp2 = *sp++;
tmp = *sp++;
*sp = ibeta(*sp, tmp, tmp2);
break;
default:
panicn ("bad op spec (%d) in eval()", (int)(ep->ex_oper));
}
}
return *sp;
}
struct expr *
#ifdef _HAVE_PROTOS
ealloc (void)
#else
ealloc ()
#endif
{
struct expr *ep;
ep = (struct expr *)xmalloc (sizeof(struct expr));
ep->ex_next = NULL;
ep->ex_sym = NULL;
ep->ex_oper = O_NOOP; /* default */
return ep;
}
void
#ifdef _HAVE_PROTOS
efree (struct expr *ep)
#else
efree (ep)
struct expr *ep;
#endif
{
if (ep == NULL || ep == &exprzero || ep == &exprone)
return;
efree (ep->ex_next);
free ((voidptr_t)ep);
}
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