|YACC(1)||General Commands Manual||YACC(1)|
yaccreads the grammar specification in file 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.
yaccnormally writes the parse tables and the driver routine to the file y.tab.c.
The options are as follows:
-boption changes the prefix prepended to the output file names to the string denoted by file_prefix. The default prefix is the character y.
-doption causes the header file y.tab.h to be written.
-loption is not specified,
yaccwill 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
-loption is specified,
yaccwill not insert the #line directives. #line directives specified by the user will be retained.
-ooption specifies an explicit name for the parser's output file name instead of the default. The names of the other output files are constructed from output_file as described under the
-poption changes the prefix prepended to yacc-generated symbols to the string denoted by symbol_prefix. The default prefix is the string yy.
yaccto produce separate files for code and tables. The code file is named y.code.c, and the tables file is named y.tab.c.
-toption changes the preprocessor directives generated by
yaccso that debugging statements will be incorporated in the compiled code.
-voption causes a human-readable description of the generated parser to be written to the file y.output.
yaccare “yylhs”, “yylen”, “yydefred”, “yydgoto”, “yysindex”, “yyrindex”, “yygindex”, “yytable”, and “yycheck”. Two additional tables, “yyname” and “yyrule”, are created if
YYDEBUGis defined and non-zero.
yaccutility exits 0 on success, and >0 if an error occurs.
F. DeRemer and T. J. Pennello, Efficient Computation of LALR(1) Look-Ahead Sets, TOPLAS, Issue 4, Volume 4, pp. 615–649, 1982.
yaccutility is compliant with the IEEE Std 1003.1-2008 (“POSIX.1”) specification, though its presence is optional.
The flags [
-or] are extensions to that
yaccwas originally developed at AT&T by Stephen C. Johnson.
yacc was originally developed
using PCC on a VAX with the intent of being as compatible as possible with
yacc. Much is
owed to the unflagging efforts of Keith Bostic. His badgering kept me
yacc long after I was ready to quit.
yacc is based on the excellent
algorithm for computing LALR(1) lookaheads developed by Tom
Pennello and Frank DeRemer. The algorithm is
described in their almost impenetrable article in TOPLAS (see above).
Finally, much credit must go to those who pointed out deficiencies of earlier releases. Among the most prolific contributors were Benson I. Margulies, Dave Gentzel, Antoine Verheijen, Peter S. Housel, Dale Smith, Ozan Yigit, John Campbell, Bill Sommerfeld, Paul Hilfinger, Gary Bridgewater, Dave Bakken, Dan Lanciani, Richard Sargent, and Parag Patel.
yaccutility was written by Robert Corbett.
|July 27, 2016||OpenBSD-current|