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misc_utils
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yacc_419
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yacc.doc
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1990-07-14
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YACC(1) USER COMMANDS 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
written.
-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 origi-
nal code. If the -l option is specified,
yacc
will not insert the #line directives. #line
directives 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
.
(The -r option has not yet been implemented.)
-t The -t option changes the preprocessor directives
generated by
yacc
so that debugging statements
will be incorporated 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.
TABLES
There is a program :
yyfix
that extracts tables from
yacc
-
generated files. The program takes the names of the tables
as its command-line arguments. The names of the tables
Sun Release 3.5 Last change: June 3, 1990 1
YACC(1) USER COMMANDS YACC(1)
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 nonzero.
FILES
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.
Sun Release 3.5 Last change: June 3, 1990 2