usr.bin/m4/parser.y

   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 __RCSID("$NetBSD: parser.y,v 1.2 2009/10/26 21:11:28 christos Exp $");
  23 #include <stdint.h>
  24 #define YYSTYPE int32_t
  25 extern int32_t end_result;
  26 extern int yylex(void);
  27 extern int yyerror(const char *);
  28 %}
  29 %token NUMBER
  30 %token ERROR
  31 %left LOR
  32 %left LAND
  33 %left '|'
  34 %left '^'
  35 %left '&'
  36 %left EQ NE
  37 %left '<' LE '>' GE
  38 %left LSHIFT RSHIFT
  39 %left '+' '-'
  40 %left '*' '/' '%'
  41 %right UMINUS UPLUS '!' '~'
  42
  43 %%
  44
  45 top     : expr { end_result = $1; }
  46         ;
  47 expr    : expr '+' expr { $$ = $1 + $3; }
  48         | expr '-' expr { $$ = $1 - $3; }
  49         | expr '*' expr { $$ = $1 * $3; }
  50         | expr '/' expr {
  51                 if ($3 == 0) {
  52                         yyerror("division by zero");
  53                         exit(1);
  54                 }
  55                 $$ = $1 / $3;
  56         }
  57         | expr '%' expr {
  58                 if ($3 == 0) {
  59                         yyerror("modulo zero");
  60                         exit(1);
  61                 }
  62                 $$ = $1 % $3;
  63         }
  64         | expr LSHIFT expr { $$ = $1 << $3; }
  65         | expr RSHIFT expr { $$ = $1 >> $3; }
  66         | expr '<' expr { $$ = $1 < $3; }
  67         | expr '>' expr { $$ = $1 > $3; }
  68         | expr LE expr { $$ = $1 <= $3; }
  69         | expr GE expr { $$ = $1 >= $3; }
  70         | expr EQ expr { $$ = $1 == $3; }
  71         | expr NE expr { $$ = $1 != $3; }
  72         | expr '&' expr { $$ = $1 & $3; }
  73         | expr '^' expr { $$ = $1 ^ $3; }
  74         | expr '|' expr { $$ = $1 | $3; }
  75         | expr LAND expr { $$ = $1 && $3; }
  76         | expr LOR expr { $$ = $1 || $3; }
  77         | '(' expr ')' { $$ = $2; }
  78         | '-' expr %prec UMINUS { $$ = -$2; }
  79         | '+' expr %prec UPLUS  { $$ = $2; }
  80         | '!' expr { $$ = !$2; }
  81         | '~' expr { $$ = ~$2; }
  82         | NUMBER
  83         ;
  84 %%
  85