src/usr.bin/yacc/yacc.1 - diff

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Diff for /src/usr.bin/yacc/yacc.1 between version 1.9 and 1.10

version 1.9, 2000/03/05 00:28:56

version 1.10, 2000/03/14 14:58:27

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.\" $OpenBSD$

.\"

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.Op Fl p Ar symbol_prefix

.Ar filename

.Sh DESCRIPTION

.Nm yacc

.Nm

reads the grammar specification in the file

.Ar filename

and generates an

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.Tn LALR(1)

parsing tables and a driver routine

written in the C programming language.

.Nm yacc

.Nm

normally writes the parse tables and the driver routine to the file

.Pa y.tab.c .

.Pp

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If the

.Fl l

option is not specified,

.Nm yacc

.Nm

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

.Fl l

option is specified,

.Nm yacc

.Nm

will not insert the #line directives.

#line directives specified by the user will be retained.

.It Fl o Ar output_file

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The

.Fl r

option causes

.Nm yacc

.Nm

to produce separate files for code and tables.

The code file is named

.Pa y.code.c ,

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The

.Fl t

option changes the preprocessor directives generated by

.Nm yacc

.Nm

so that debugging statements will be incorporated in the compiled code.

.It Fl v

The

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be written to the file

.Pa y.output .

.Sh ENVIRONMENT

The following environment variable is referenced by

The following environment variables affect the execution of

.Nm yacc :

.Bl -tag -width TMPDIR

.It Ev TMPDIR

If the environment variable

Name of directory where temporary files are to be created.

.Ev TMPDIR

is set, the string denoted by

.Ev TMPDIR

will be used as the name of the directory where the temporary

files are created.

.El

.Sh TABLES

The names of the tables generated by this version of

.Nm yacc

.Nm

are

.Dq yylhs ,

.Dq yylen ,

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are created if

.Dv YYDEBUG

is defined and non-zero.

.Sh DIAGNOSTICS

If there are rules that are never reduced, the number of such rules is

written to the standard error.

If there are any

.Tn LALR(1)

conflicts, the number of conflicts is also written

to the standard error.

.Sh FILES

.Bl -tag -width /tmp/yacc.uXXXXXXXXXX -compact

.It Pa y.code.c

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.It Pa /tmp/yacc.tXXXXXXXXXX

.It Pa /tmp/yacc.uXXXXXXXXXX

.El

.Sh DIAGNOSTICS

If there are rules that are never reduced, the number of such rules is

written to the standard error.

If there are any

.Tn LALR(1)

conflicts, the number of conflicts is also written

to the standard error.

.Sh SEE ALSO

.Xr yyfix 1

.Sh STANDARDS

The

.Nm yacc

.Nm

utility conforms to

.St -p1003.2 .