Home | History | Annotate | Line # | Download | only in m4 
      1 %{
      2 /* $NetBSD: parser.y,v 1.3 2015/01/04 18:31:09 joerg Exp $ */
      3 /* $OpenBSD: parser.y,v 1.6 2008/08/21 21:00:14 espie Exp $ */
      4 /*
      5  * Copyright (c) 2004 Marc Espie <espie (at) cvs.openbsd.org>
      6  *
      7  * Permission to use, copy, modify, and distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 #if HAVE_NBTOOL_CONFIG_H
     20 #include "nbtool_config.h"
     21 #endif
     22 #include <sys/cdefs.h>
     23 __RCSID("$NetBSD: parser.y,v 1.3 2015/01/04 18:31:09 joerg Exp $");
     24 #include <stdint.h>
     25 #define YYSTYPE	int32_t
     26 extern int32_t end_result;
     27 extern int yylex(void);
     28 extern int yyerror(const char *);
     29 %}
     30 %token NUMBER
     31 %token ERROR
     32 %left LOR
     33 %left LAND
     34 %left '|'
     35 %left '^'
     36 %left '&'
     37 %left EQ NE
     38 %left '<' LE '>' GE
     39 %left LSHIFT RSHIFT
     40 %left '+' '-'
     41 %left '*' '/' '%'
     42 %right UMINUS UPLUS '!' '~'
     43 
     44 %%
     45 
     46 top	: expr { end_result = $1; }
     47 	;
     48 expr 	: expr '+' expr { $$ = $1 + $3; }
     49      	| expr '-' expr { $$ = $1 - $3; }
     50      	| expr '*' expr { $$ = $1 * $3; }
     51 	| expr '/' expr {
     52 		if ($3 == 0) {
     53 			yyerror("division by zero");
     54 			exit(1);
     55 		}
     56 		$$ = $1 / $3;
     57 	}
     58 	| expr '%' expr {
     59 		if ($3 == 0) {
     60 			yyerror("modulo zero");
     61 			exit(1);
     62 		}
     63 		$$ = $1 % $3;
     64 	}
     65 	| expr LSHIFT expr { $$ = $1 << $3; }
     66 	| expr RSHIFT expr { $$ = $1 >> $3; }
     67 	| expr '<' expr { $$ = $1 < $3; }
     68 	| expr '>' expr { $$ = $1 > $3; }
     69 	| expr LE expr { $$ = $1 <= $3; }
     70 	| expr GE expr { $$ = $1 >= $3; }
     71 	| expr EQ expr { $$ = $1 == $3; }
     72 	| expr NE expr { $$ = $1 != $3; }
     73 	| expr '&' expr { $$ = $1 & $3; }
     74 	| expr '^' expr { $$ = $1 ^ $3; }
     75 	| expr '|' expr { $$ = $1 | $3; }
     76 	| expr LAND expr { $$ = $1 && $3; }
     77 	| expr LOR expr { $$ = $1 || $3; }
     78 	| '(' expr ')' { $$ = $2; }
     79 	| '-' expr %prec UMINUS { $$ = -$2; }
     80 	| '+' expr %prec UPLUS  { $$ = $2; }
     81 	| '!' expr { $$ = !$2; }
     82 	| '~' expr { $$ = ~$2; }
     83 	| NUMBER
     84 	;
     85 %%
     86 
     87