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Sourcecode: nase-a60 version File versions

expr.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.
 *
 * expr.h:                          aug '90
 *
 * Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
 */

#ifndef EXPR_H_HOOK
#define EXPR_H_HOOK

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


enum expr_tag {
      e_nop,
      e_symbol,
      e_string,
      e_label,
      e_switch,
      e_ival,
      e_rval,
      e_bool,
      e_fcall,          /* complete function */
      e_fparm,          /* function parameter */
      e_op_neg,
      e_op_not,
      e_op_plus,
      e_op_minus,
      e_op_times,
      e_op_rdiv,
      e_op_idiv,
      e_op_pow,
      e_op_and,
      e_op_or,
      e_op_equiv,
      e_op_impl,
      e_op_less,
      e_op_notgreater,
      e_op_equal,
      e_op_notless,
      e_op_greater,
      e_op_notequal,
      e_condexpr,
      E_LAST_EXPR_TAG
};

#define EIS_NOP(x)      ((x) == e_nop)
#define EIS_SYMBOL(x)   ((x) == e_symbol)
#define EIS_NUM(x)      ((x) >= e_ival && (x) <= e_rval)
#define EIS_BOOL(x)     ((x) == e_bool)
#define EIS_STRING(x)   ((x) == e_string)
#define EIS_PLAIN(x)    (EIS_NUM(x) || EIS_BOOL(x))
#define EIS_UNEXP(x)    ((x) >= e_op_neg && (x) <= e_op_not)
#define EIS_BINEXP(x)   ((x) >= e_op_plus && (x) <= e_op_notequal)
#define EIS_ARITHEXP(x) ((x) >= e_op_plus && (x) <= e_op_pow)
#define EIS_BOOLEXP(x)  ((x) >= e_op_and && (x) <= e_op_impl)
#define EIS_RELEXP(x)   ((x) >= e_op_less && (x) <= e_op_notequal)

extern char *expr_tag_name[];

/*
 * switch at runtime; an identifier and the subscript expression.
 */

typedef struct _eswitch {
      struct _symtab *sym;          /* the switch identifier */
      struct _expr *expr;           /* the subscript expression */
} ESWITCH;


/*
 * the expression cell:
 */

typedef struct _expr {
      ENUM expr_tag tag;
      ENUM type_tag type;
      union {
            long ival;
            double rval;
            int bool;
            char *string;                 /* string constant */
            struct _symtab *label;        /* label */
            struct _eswitch *eswitch;     /* switch */
            struct _lhelm *lhelm;         /* var, label, switch */
            struct _expr *expr[3];        /* unop, binop, if */
      } u;
      struct _expr *next;                 /* list for fun-calls */
      char *source;
      int lineno;
} EXPR;


extern EXPR *new_expr P((enum expr_tag, enum type_tag));
extern EXPR *new_mix_expr P((EXPR *, enum expr_tag, EXPR *));
extern EXPR *new_xmix_expr P((EXPR *, enum expr_tag, EXPR *));
extern ESWITCH *new_eswitch P((char *, EXPR *));
extern void append_expr P((EXPR **, EXPR *));
extern void check_expr P((EXPR *));
extern void print_expr P((EXPR *));

#undef P

#endif /* EXPR_H_HOOK */

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