YACC(1) BSD General Commands Manual YACC(1)NAME
yacc — an LALR(1) parser generator
yacc [-dlrtv] [-b file_prefix] [-o output_filename] [-p symbol_prefix]
The yacc utility 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. The yacc utility normally writes the parse tables and the
driver routine to the file y.tab.c.
The following options are available:
Change the prefix prepended to the output file names to the
string denoted by file_prefix. The default prefix is the charac‐
-d Cause 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. Any #line directives specified by the user
will be retained.
Cause yacc to write the generated code to output_filename instead
of the default file, y.tab.c.
Change the prefix prepended to yacc-generated symbols to the
string denoted by symbol_prefix. The default prefix is the
-r Cause yacc to produce separate files for code and tables. The
code file is named y.code.c, and the tables file is named
-t Change the preprocessor directives generated by yacc so that
debugging statements will be incorporated in the compiled code.
-v Cause a human-readable description of the generated 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-zero.
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 num‐
ber of conflicts is reported on standard error.
The yacc utility conforms to IEEE Std 1003.2 (“POSIX.2”).
A yacc command appeared in PWB UNIX.
BSD May 24, 1993 BSD