1%{ 2/* $NetBSD: parser.y,v 1.2 2009/10/26 21:11:28 christos 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 1.2 2009/10/26 21:11:28 christos Exp $"); 24#include <stdint.h> 25#define YYSTYPE int32_t 26extern int32_t end_result; 27extern int yylex(void); 28extern 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 46top : expr { end_result = $1; } 47 ; 48expr : 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