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/* $OpenBSD: cpy.y,v 1.4 2007/10/21 18:58:02 otto Exp $ */
/*
* Copyright (c) 2004 Anders Magnusson (ragge@ludd.luth.se).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code and documentation must retain the above
* copyright notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed or owned by Caldera
* International, Inc.
* Neither the name of Caldera International, Inc. nor the names of other
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
* FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OFLIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
%{
#include "cpp.h"
void yyerror(char *);
int yylex(void);
int setd(int l, int r);
#define EVALUNARY(tok, l, r) l.nd_val = tok r.nd_val; l.op = r.op
#define EVALBIN(tok, d, l, r) \
d.op = setd(l.op, r.op); d.nd_val = l.nd_val tok r.nd_val
#define EVALUBIN(tok, d, l, r, t) \
d.op = setd(l.op, r.op); \
if (d.op == NUMBER) d.nd_val = l.nd_val tok r.nd_val; \
else d.nd_uval = l.nd_uval tok r.nd_uval; \
if (t && d.op) d.op = NUMBER
#define XEVALUBIN(tok, d, l, r) \
if (r.nd_val) { EVALUBIN(tok, d, l, r, 0); } else d.op = 0
%}
%term stop
%term EQ NE LE GE LS RS
%term ANDAND OROR IDENT NUMBER UNUMBER
/*
* The following terminals are not used in the yacc code.
*/
%term STRING FPOINT WSPACE VA_ARGS CONCAT MKSTR ELLIPS
%left ','
%right '?' ':'
%left OROR
%left ANDAND
%left '|' '^'
%left '&'
%binary EQ NE
%binary '<' '>' LE GE
%left LS RS
%left '+' '-'
%left '*' '/' '%'
%right '!' '~' UMINUS
%left '('
%union {
struct nd node;
}
%type <node> term e NUMBER UNUMBER
%%
S: e '\n' {
if ($1.op == 0)
error("division by zero");
return $1.nd_val;
}
e: e '*' e
{ EVALUBIN(*, $$, $1, $3, 0); }
| e '/' e
{ XEVALUBIN(/, $$, $1, $3); }
| e '%' e
{ XEVALUBIN(%, $$, $1, $3); }
| e '+' e
{ EVALBIN(+, $$, $1, $3); }
| e '-' e
{ EVALBIN(-, $$, $1, $3); }
| e LS e
{ EVALBIN(<<, $$, $1, $3); }
| e RS e
{ EVALUBIN(>>, $$, $1, $3, 0); }
| e '<' e
{ EVALUBIN(<, $$, $1, $3, 1); }
| e '>' e
{ EVALUBIN(>, $$, $1, $3, 1); }
| e LE e
{ EVALUBIN(<=, $$, $1, $3, 1); }
| e GE e
{ EVALUBIN(>=, $$, $1, $3, 1); }
| e EQ e
{ EVALUBIN(==, $$, $1, $3, 1); }
| e NE e
{ EVALUBIN(!=, $$, $1, $3, 1); }
| e '&' e
{ EVALBIN(&, $$, $1, $3); }
| e '^' e
{ EVALBIN(^, $$, $1, $3); }
| e '|' e
{ EVALBIN(|, $$, $1, $3); }
| e ANDAND e {
$$ = $1;
if ($1.nd_val) {
$$.op = setd($1.op, $3.op);
$$.nd_val = ($3.nd_val != 0);
}
if ($$.op == UNUMBER) $$.op = NUMBER;
}
| e OROR e {
if ($1.nd_val != 0) {
$$.nd_val = ($1.nd_val != 0);
$$.op = $1.op;
} else {
$$.nd_val = ($3.nd_val != 0);
$$.op = setd($1.op, $3.op);
}
if ($$.op == UNUMBER) $$.op = NUMBER;
}
| e '?' e ':' e {
if ($1.op == 0)
$$ = $1;
else if ($1.nd_val)
$$ = $3;
else
$$ = $5;
}
| e ',' e {
$$.op = setd($1.op, $3.op);
$$.nd_val = $3.nd_val;
if ($$.op) $$.op = $3.op;
}
| term
{$$ = $1;}
term:
'-' term %prec UMINUS
{ EVALUNARY(-, $$, $2); }
| '+' term %prec UMINUS
{$$ = $2;}
| '!' term
{ $$.nd_val = ! $2.nd_val; $$.op = $2.op ? NUMBER : 0; }
| '~' term
{ EVALUNARY(~, $$, $2); }
| '(' e ')'
{$$ = $2;}
| NUMBER
{$$ = $1;}
%%
void
yyerror(char *err)
{
error(err);
}
/*
* Set return type of an expression.
*/
int
setd(int l, int r)
{
if (!l || !r)
return 0; /* div by zero involved */
if (l == UNUMBER || r == UNUMBER)
return UNUMBER;
return NUMBER;
}
|
