The
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
utility normally writes the parse tables and the driver routine to the file
y.tab.c
The following options are available:
-b file_prefix
Change the prefix prepended to the output file names to
the string denoted by
file_prefix
The default prefix is the character
y
-d
Cause the header file
y.tab.h
to be written.
-l
If the
-l
option is not specified,
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,
will not insert the #line directives.
Any #line directives specified by the user will be retained.
-o output_filename
Cause
to write the generated code to
output_filename
instead of the default file,
y.tab.c
-p symbol_prefix
Change the prefix prepended to yacc-generated symbols to
the string denoted by
symbol_prefix
The default prefix is the string
yy
-r
Cause
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
Change the preprocessor directives generated by
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
ENVIRONMENT
TMPDIR
Name of directory where temporary files are to be created.
TABLES
The names of the tables generated by this version of
are
yylhs , yylen , yydefred , yydgoto , yysindexyyrindex , yygindex , yytable
and
yycheck
Two additional tables,
yyname
and
yyrule
are created if
YYDEBUG
is defined and non-zero.
FILES
y.code.c
y.tab.c
y.tab.h
y.output
/tmp/yacc.aXXXXXXXXXX
/tmp/yacc.tXXXXXXXXXX
/tmp/yacc.uXXXXXXXXXX
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.
