Index of Section 1 Manual Pages
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YACC(1) System General Commands Manual YACC(1)
yacc - an LALR(1) parser generator
yacc [-dlrtv] [-b prefix] [-o output_file] [-p symbol_prefix] filename
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
The options are as follows:
The -b option changes the prefix prepended to the output file
names to the string denoted by prefix. The default prefix is the
-d The -d option causes the header file y.tab.h to be written.
-l If the -l option is not specified, yacc will insert #line direc-
tives in the generated code. The #line directives let the C com-
piler 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 directives specified by the user will be
The -o option specifies an explicit name for the parser's output
file name instead of the default. The names of the other output
files are constructed from output_file as described under the -d
and -v options.
The -p option changes the prefix prepended to yacc-generated sym-
bols to the string denoted by symbol_prefix. The default prefix
is the string yy.
-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
-t The -t option changes the preprocessor directives generated by
yacc so that debugging statements will be incorporated in the
-v The -v option causes a human-readable description of the gener-
ated parser to be written to the file y.output.
TMPDIR Name of directory where temporary files are to be created.
The names of the tables generated by this version of yacc are ``yylhs'',
``yylen'', ``yydefred'', ``yydgoto'', ``yysindex'', ``yyrindex'',
``yygindex'', ``yytable'', and ``yycheck''. Two additional tables,
``yyname'' and ``yyrule'', are created if YYDEBUG is defined and non-
If there are rules that are never reduced, the number of such rules is
written to the standard error. If there are any LALR(1) conflicts, the
number of conflicts is also written to the standard error.
The yacc utility conforms to IEEE Std 1003.2 (``POSIX.2'').
BSD July 30, 1991 BSD