usr.bin/m4/parser.y

   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: src/usr.bin/m4/parser.y,v 1.6 2012/11/17 01:54:24 svnexp Exp $
  19  */
  20
  21 #include <math.h>
  22 #include <stddef.h>
  23 #include <stdio.h>
  24 #include <stdint.h>
  25 #include <sys/param.h>
  26
  27 #include "mdef.h"
  28 #include "extern.h"
  29
  30 #define YYSTYPE int32_t
  31
  32 extern int yylex(void);
  33 extern int yyerror(const char *);
  34 %}
  35 %token NUMBER
  36 %token ERROR
  37 %left LOR
  38 %left LAND
  39 %left '|'
  40 %left '^'
  41 %left '&'
  42 %left EQ NE
  43 %left '<' LE '>' GE
  44 %left LSHIFT RSHIFT
  45 %left '+' '-'
  46 %left '*' '/' '%'
  47 %right EXPONENT
  48 %right UMINUS UPLUS '!' '~'
  49
  50 %%
  51
  52 top     : expr { end_result = $1; }
  53         ;
  54 expr    : expr '+' expr { $$ = $1 + $3; }
  55         | expr '-' expr { $$ = $1 - $3; }
  56         | expr EXPONENT expr { $$ = pow($1, $3); }
  57         | expr '*' expr { $$ = $1 * $3; }
  58         | expr '/' expr {
  59                 if ($3 == 0) {
  60                         yyerror("division by zero");
  61                         exit(1);
  62                 }
  63                 $$ = $1 / $3;
  64         }
  65         | expr '%' expr {
  66                 if ($3 == 0) {
  67                         yyerror("modulo zero");
  68                         exit(1);
  69                 }
  70                 $$ = $1 % $3;
  71         }
  72         | expr LSHIFT expr { $$ = $1 << $3; }
  73         | expr RSHIFT expr { $$ = $1 >> $3; }
  74         | expr '<' expr { $$ = $1 < $3; }
  75         | expr '>' expr { $$ = $1 > $3; }
  76         | expr LE expr { $$ = $1 <= $3; }
  77         | expr GE expr { $$ = $1 >= $3; }
  78         | expr EQ expr { $$ = $1 == $3; }
  79         | expr NE expr { $$ = $1 != $3; }
  80         | expr '&' expr { $$ = $1 & $3; }
  81         | expr '^' expr { $$ = $1 ^ $3; }
  82         | expr '|' expr { $$ = $1 | $3; }
  83         | expr LAND expr { $$ = $1 && $3; }
  84         | expr LOR expr { $$ = $1 || $3; }
  85         | '(' expr ')' { $$ = $2; }
  86         | '-' expr %prec UMINUS { $$ = -$2; }
  87         | '+' expr %prec UPLUS  { $$ = $2; }
  88         | '!' expr { $$ = !$2; }
  89         | '~' expr { $$ = ~$2; }
  90         | NUMBER
  91         ;
  92 %%