YACC(1)YACC(1)NAME
Yacc - an LALR(1) parser generator
SYNOPSIS
yacc [ -dlrtv ] [ -b prefix ] filename
DESCRIPTION
Yacc reads the grammar specification in the file filename and generates
an LR(1) parser for it. The parsers consist of a set of LALR(1) parsing
tables and a driver routine written in the C programming language. Yacc
normally writes the parse tables and the driver routine to the file
y.tab.c.
The following options are available:
-b prefix
The -b option changes the prefix prepended to the output
file names to the string denoted by prefix. The default
prefix is the character y.
-d The -d option causes the header file y.tab.h to be writ-
ten.
-l If the -l option is not specified, 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 -l option is specified,
yacc will not insert the #line directives. #line direc-
tives specified by the user will be retained.
-r The -r option causes yacc to produce separate files for
code and tables. The code file is named y.code.c, and the
tables file is named y.tab.c.
-t The -t option changes the preprocessor directives gener-
ated by yacc so that debugging statements will be incorpo-
rated in the compiled code.
-v The -v option causes a human-readable description of the
generated parser to be written to the file y.output.
If the environment variable TMPDIR is set, the string denoted by TMPDIR
will be used as the name of the directory where the temporary files are
created.
FILES
y.code.c
y.tab.c
y.tab.h
y.output
/tmp/yacc.aXXXXXX
/tmp/yacc.tXXXXXX
/tmp/yacc.uXXXXXX
DIAGNOSTICS
If there are rules that are never reduced, the number of such rules is
reported on standard error. If there are any LALR(1) conflicts, the
number of conflicts is reported on standard error.
July 15, 1990 2
