home *** CD-ROM | disk | FTP | other *** search
- .\" Copyright (c) 1989, 1990 The Regents of the University of California.
- .\" All rights reserved.
- .\"
- .\" This code is derived from software contributed to Berkeley by
- .\" Robert Paul Corbett.
- .\"
- .\" 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. All advertising materials mentioning features or use of this software
- .\" must display the following acknowledgement:
- .\" This product includes software developed by the University of
- .\" California, Berkeley and its contributors.
- .\" 4. Neither the name of the University nor the names of its contributors
- .\" may be used to endorse or promote products derived from this software
- .\" without specific prior written permission.
- .\"
- .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS OR CONTRIBUTORS 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.
- .\"
- .\" @(#)yacc.1 5.7 (Berkeley) 7/30/91
- .\"
- .Dd July 30, 1991
- .Dt YACC 1
- .Os
- .Sh NAME
- .Nm yacc
- .Nd an
- .Tn LALR(1)
- parser generator
- .Sh SYNOPSIS
- .Nm yacc
- .Op Fl dlrtv
- .Op Fl b Ar prefix
- .Ar filename
- .Sh DESCRIPTION
- .Nm Yacc
- reads the grammar specification in the file
- .Ar filename
- and generates an
- .Tn LR(1)
- parser for it.
- The parsers consist of a set of
- .Tn LALR(1)
- parsing tables and a driver routine
- written in the C programming language.
- .Nm Yacc
- normally writes the parse tables and the driver routine to the file
- .Pa y.tab.c .
- .Pp
- The following options are available:
- .Bl -tag -width Ar
- .It Fl b Ar prefix
- The
- .Fl b
- option changes the prefix prepended to the output file names to
- the string denoted by
- .Ar prefix .
- The default prefix is the character
- .Ar y .
- .It Fl d
- The
- .Fl d
- option causes the header file
- .Pa y.tab.h
- to be written.
- .It Fl l
- If the
- .Fl l
- option is not specified,
- .Nm yacc
- will insert \#line directives in the generated code.
- The \#line directives let the C compiler relate errors in the
- generated code to the user's original code.
- If the
- .Fl l
- option is specified,
- .Nm yacc
- will not insert the \#line directives.
- \&\#line directives specified by the user will be retained.
- .It Fl r
- The
- .Fl r
- option causes
- .Nm yacc
- to produce separate files for code and tables.
- The code file is named
- .Pa y.code.c ,
- and the tables file is named
- .Pa y.tab.c .
- .It Fl t
- The
- .Fl t
- option changes the preprocessor directives generated by
- .Nm yacc
- so that debugging statements will be incorporated in the compiled code.
- .It Fl v
- The
- .Fl v
- option causes a human-readable description of the generated parser to
- be written to the file
- .Pa y.output .
- .Pp
- .Sh ENVIRONMENT
- The following environment variable is referenced by
- .Nm yacc :
- .Bl -tag -width TMPDIR
- .It Ev TMPDIR
- If the environment variable
- .Ev TMPDIR
- is set, the string denoted by
- .Ev TMPDIR
- will be used as the name of the directory where the temporary
- files are created.
- .El
- .Sh TABLES
- The names of the tables generated by this version of
- .Nm yacc
- are
- .Dq yylhs ,
- .Dq yylen ,
- .Dq yydefred ,
- .Dq yydgoto ,
- .Dq yysindex ,
- .Dq yyrindex ,
- .Dq yygindex ,
- .Dq yytable ,
- and
- .Dq yycheck .
- Two additional tables,
- .Dq yyname
- and
- .Dq yyrule ,
- are created if
- .Dv YYDEBUG
- is defined and non-zero.
- .Sh FILES
- .Bl -tag -width /tmp/yacc.uXXXXXXXX -compact
- .It Pa y.code.c
- .It Pa y.tab.c
- .It Pa y.tab.h
- .It Pa y.output
- .It Pa /tmp/yacc.aXXXXXX
- .It Pa /tmp/yacc.tXXXXXX
- .It Pa /tmp/yacc.uXXXXXX
- .El
- .Sh DIAGNOSTICS
- If there are rules that are never reduced, the number of such rules is
- written to the standard error.
- If there are any
- .Tn LALR(1)
- conflicts, the number of conflicts is also written
- to the standard error.
- .Sh SEE ALSO
- .Xr yyfix 1
- .Sh STANDARDS
- The
- .Nm yacc
- utility conforms to
- .St -p1003.2 .
-