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Sourcecode: nase-a60 version File versions

eval.h

/*
 * Copyright (C) 1991,1999 Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
 *
 * This file is part of NASE A60.
 * 
 * NASE A60 is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * NASE A60 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with NASE A60; see the file COPYING.  If not, write to the Free
 * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * eval.h:                          sept '90
 *
 * Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
 */

#ifndef EVAL_H_HOOK
#define EVAL_H_HOOK

#include "expr.h"

#ifdef __STDC__
# define P(x)  x
#else
# define P(x)  ()
#endif


enum eval_tag {
      ev_none,
      ev_ival,
      ev_rval,
      ev_bool,
      ev_unop,
      ev_binop,
      ev_valaddr,
      ev_label,
      ev_switch,
      ev_proc,
      ev_string,
      ev_expr,
      ev_sym,
      r_last_eval_tag
};

#define EV_PLAIN(x)     ((x) == ev_ival || (x) == ev_rval || (x) == ev_bool)


extern char *eval_tag_name[];



typedef struct _valaddr {
      ENUM type_tag type;
      struct _value *val;
} VALADDR;


typedef struct _pexpr {
      struct _cblock *cblock;
      struct _expr *expr;
} PEXPR;


typedef struct _evalelm {
      ENUM eval_tag tag;
      union {
            ENUM expr_tag op;
            long ival;
            double rval;
            int bool;
            char *string;
            struct _valaddr valaddr;      /* a typed value cell */
            struct _symtab *sym;          /* label / switch / proc */
            struct _pexpr pexpr;          /* parameter passing */
      } u;

      /* ugly hack for proc parameter passing: */
      struct _cblock *act;                /* passed with proc */

      char *source;
      int lineno;
} EVALELM;

extern int evalst_siz;
extern int evalst_idx;
extern EVALELM *evalst;

#if 0
/* not yet, maybe never: arg 's' from main.c: */
extern int shortcut_eval;
#endif

#define TOP_EVALST      (evalst + evalst_idx - 1)
#define POP_EVALST      (evalst + --evalst_idx)
#define     CLEAR_EVALST      evalst_idx = 0

#define CHECK_EVALST \
      if (evalst_idx + 10 > evalst_siz) expand_evalst ()

#ifdef __GNUC__
#define PUSH_EVALST(so,li,tt) \
      ({EVALELM *_ev; CHECK_EVALST; _ev = evalst + evalst_idx; \
        _ev->tag = tt, _ev->source = so; _ev->lineno = li; \
        evalst_idx++; _ev; })
#else
#define PUSH_EVALST(so,li,tt) \
      (((evalst_idx + 10 > evalst_siz) ? (expand_evalst (), 0) : 0), \
       (evalst+evalst_idx)->tag = tt, \
       (evalst+evalst_idx)->source = so, \
       (evalst+evalst_idx)->lineno = li, \
       (evalst + evalst_idx++))
#endif


extern void init_evalst P((void));
extern void expand_evalst P((void));
extern struct _evalelm *push_evalst P((char *, int, enum eval_tag));
extern void dump_evalst P((char *));
extern void do_unop P((enum expr_tag));
extern void do_binop P((enum expr_tag));

#define DO_DEREF(s, n) \
      if ((TOP_EVALST)->tag == ev_valaddr) do_deref (s, n)
extern void do_deref P((char *, int));

extern void store_data ();
extern void do_eval_sign P((void));


extern void do_eval_pexpr P((struct _pexpr *));
extern void do_eval_expr P((struct _expr *));

extern void do_eval_lhelm P((struct _lhelm *));
extern void do_push_lhelm P((struct _lhelm *));


#undef P

#endif /* EVAL_H_HOOK */

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