1 %{ 2 /* $OpenBSD: parser.y,v 1.6 2008/08/21 21:00:14 espie Exp $ */ 3 /* 4 * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 * 18 * $FreeBSD$ 19 */ 20 21 #include <math.h> 22 #include <stddef.h> 23 #include <stdio.h> 24 #include <stdint.h> 25 26 #include "mdef.h" 27 #include "extern.h" 28 29 #define YYSTYPE int32_t 30 31 extern int yylex(void); 32 extern int yyerror(const char *); 33 %} 34 %token NUMBER 35 %token ERROR 36 %left LOR 37 %left LAND 38 %left '|' 39 %left '^' 40 %left '&' 41 %left EQ NE 42 %left '<' LE '>' GE 43 %left LSHIFT RSHIFT 44 %left '+' '-' 45 %left '*' '/' '%' 46 %right EXPONENT 47 %right UMINUS UPLUS '!' '~' 48 49 %% 50 51 top : expr { end_result = $1; } 52 ; 53 expr : expr '+' expr { $$ = $1 + $3; } 54 | expr '-' expr { $$ = $1 - $3; } 55 | expr EXPONENT expr { $$ = pow($1, $3); } 56 | expr '*' expr { $$ = $1 * $3; } 57 | expr '/' expr { 58 if ($3 == 0) { 59 yyerror("division by zero"); 60 exit(1); 61 } 62 $$ = $1 / $3; 63 } 64 | expr '%' expr { 65 if ($3 == 0) { 66 yyerror("modulo zero"); 67 exit(1); 68 } 69 $$ = $1 % $3; 70 } 71 | expr LSHIFT expr { $$ = $1 << $3; } 72 | expr RSHIFT expr { $$ = $1 >> $3; } 73 | expr '<' expr { $$ = $1 < $3; } 74 | expr '>' expr { $$ = $1 > $3; } 75 | expr LE expr { $$ = $1 <= $3; } 76 | expr GE expr { $$ = $1 >= $3; } 77 | expr EQ expr { $$ = $1 == $3; } 78 | expr NE expr { $$ = $1 != $3; } 79 | expr '&' expr { $$ = $1 & $3; } 80 | expr '^' expr { $$ = $1 ^ $3; } 81 | expr '|' expr { $$ = $1 | $3; } 82 | expr LAND expr { $$ = $1 && $3; } 83 | expr LOR expr { $$ = $1 || $3; } 84 | '(' expr ')' { $$ = $2; } 85 | '-' expr %prec UMINUS { $$ = -$2; } 86 | '+' expr %prec UPLUS { $$ = $2; } 87 | '!' expr { $$ = !$2; } 88 | '~' expr { $$ = ~$2; } 89 | NUMBER 90 ; 91 %% 92 93