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vmgen-related changes:
in prims2x:
  Conversion macros for single items now take 2 arguments
  Converting from two items to a type has changed order
  argument printing for disassembler disabled (for now)
  disassembler now also uses VM_IS_INST
in Gforth and vmgen-ex: adapted to work with changed prims2x
new: vmgen-ex2: uses union for Cell instead of casting (lots of
   changes compared to vmgen-ex)

    1: /* front-end scanner for vmgen example
    2: 
    3:   Copyright (C) 2001 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation; either version 2
   10:   of the License, or (at your option) any later version.
   11: 
   12:   This program is distributed in the hope that it will be useful,
   13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:   GNU General Public License for more details.
   16: 
   17:   You should have received a copy of the GNU General Public License
   18:   along with this program; if not, write to the Free Software
   19:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: */
   21: 
   22: /* %option yylineno (flex option, implied by flex -l) */
   23: 
   24: %%
   25: [-();,+*&|<=!]	return yytext[0];
   26: :=	return BECOMES;
   27: func	return FUNC;
   28: return	return RETURN;
   29: end	return END;
   30: var	return VAR;
   31: if	return IF;
   32: then	return THEN;
   33: else	return ELSE;
   34: while	return WHILE;
   35: do	return DO;
   36: print	return PRINT;
   37: [0-9]+			{ yylval.num=strtol(yytext,NULL,10); return NUM; }
   38: [a-zA-Z\_][a-zA-Z0-9\_]*	{ yylval.string=strdup(yytext); return IDENT; }
   39: [ \t\n]	;
   40: [/][/].*	;
   41: .		yyerror("illegal character"); exit(1);
   42: %%