| 1 | .\" %W% %R% (Berkeley) %E%
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| 2 | .\"
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| 3 | .TH YACC 1 "July 15, 1990"
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| 4 | .UC 6
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| 5 | .SH NAME
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| 6 | yacc \- an LALR(1) parser generator
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| 7 | .SH SYNOPSIS
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| 8 | .B yacc [ -dlrtv ] [ -b
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| 9 | .I file_prefix
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| 10 | .B ] [ -p
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| 11 | .I symbol_prefix
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| 12 | .B ]
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| 13 | .I filename
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| 14 | .SH DESCRIPTION
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| 15 | .I Yacc
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| 16 | reads the grammar specification in the file
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| 17 | .I filename
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| 18 | and generates an LR(1) parser for it.
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| 19 | The parsers consist of a set of LALR(1) parsing tables and a driver routine
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| 20 | written in the C programming language.
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| 21 | .I Yacc
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| 22 | normally writes the parse tables and the driver routine to the file
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| 23 | .IR y.tab.c.
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| 24 | .PP
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| 25 | The following options are available:
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| 26 | .RS
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| 27 | .TP
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| 28 | \fB-b \fIfile_prefix\fR
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| 29 | The
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| 30 | .B -b
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| 31 | option changes the prefix prepended to the output file names to
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| 32 | the string denoted by
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| 33 | .IR file_prefix.
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| 34 | The default prefix is the character
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| 35 | .IR y.
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| 36 | .TP
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| 37 | .B -d
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| 38 | The \fB-d\fR option causes the header file
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| 39 | .IR y.tab.h
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| 40 | to be written.
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| 41 | .TP
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| 42 | .B -l
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| 43 | If the
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| 44 | .B -l
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| 45 | option is not specified,
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| 46 | .I yacc
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| 47 | will insert #line directives in the generated code.
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| 48 | The #line directives let the C compiler relate errors in the
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| 49 | generated code to the user's original code.
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| 50 | If the \fB-l\fR option is specified,
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| 51 | .I yacc
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| 52 | will not insert the #line directives.
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| 53 | \&#line directives specified by the user will be retained.
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| 54 | .TP
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| 55 | \fB-p \fIsymbol_prefix\fR
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| 56 | The
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| 57 | .B -p
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| 58 | option changes the prefix prepended to yacc-generated symbols to
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| 59 | the string denoted by
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| 60 | .IR symbol_prefix.
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| 61 | The default prefix is the string
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| 62 | .IR yy.
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| 63 | .TP
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| 64 | .B -r
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| 65 | The
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| 66 | .B -r
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| 67 | option causes
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| 68 | .I yacc
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| 69 | to produce separate files for code and tables. The code file
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| 70 | is named
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| 71 | .IR y.code.c,
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| 72 | and the tables file is named
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| 73 | .IR y.tab.c.
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| 74 | .TP
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| 75 | .B -t
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| 76 | The
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| 77 | .B -t
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| 78 | option changes the preprocessor directives generated by
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| 79 | .I yacc
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| 80 | so that debugging statements will be incorporated in the compiled code.
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| 81 | .TP
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| 82 | .B -v
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| 83 | The
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| 84 | .B -v
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| 85 | option causes a human-readable description of the generated parser to
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| 86 | be written to the file
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| 87 | .IR y.output.
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| 88 | .RE
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| 89 | .PP
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| 90 | If the environment variable TMPDIR is set, the string denoted by
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| 91 | TMPDIR will be used as the name of the directory where the temporary
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| 92 | files are created.
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| 93 | .SH FILES
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| 94 | .IR y.code.c
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| 95 | .br
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| 96 | .IR y.tab.c
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| 97 | .br
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| 98 | .IR y.tab.h
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| 99 | .br
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| 100 | .IR y.output
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| 101 | .br
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| 102 | .IR /tmp/yacc.aXXXXXX
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| 103 | .br
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| 104 | .IR /tmp/yacc.tXXXXXX
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| 105 | .br
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| 106 | .IR /tmp/yacc.uXXXXXX
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| 107 | .SH DIAGNOSTICS
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| 108 | If there are rules that are never reduced, the number of such rules is
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| 109 | reported on standard error.
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| 110 | If there are any LALR(1) conflicts, the number of conflicts is reported
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| 111 | on standard error.
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