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@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