# 2.11BSD#431 - /usr/man/cat1/yacc.0

    YACC(1)             UNIX Programmer's Manual		  YACC(1)

    NAME
         yacc - yet another compiler-compiler

    SYNOPSIS
         yacc [ -vd ] grammar

    DESCRIPTION
         Yacc converts a context-free grammar into a set of tables
         for a simple automaton which executes an LR(1) parsing algo-
         rithm.  The grammar may be ambiguous; specified precedence
         rules are used to break ambiguities.

         The output file, y.tab.c, must be compiled by the C compiler
         to produce a program yyparse.  This program must be loaded
         with the lexical analyzer program, yylex, as well as main
         and yyerror, an error handling routine.  These routines must
         be supplied by the user; Lex(1) is useful for creating lexi-
         cal analyzers usable by yacc.

         If the -v flag is given, the file y.output is prepared,
         which contains a description of the parsing tables and a
         report on conflicts generated by ambiguities in the grammar.

         If the -d flag is used, the file y.tab.h is generated with
         the define statements that associate the yacc-assigned
         `token codes' with the user-declared `token names'.  This
         allows source files other than y.tab.c to access the token
         codes.

    FILES
         y.output
         y.tab.c
         y.tab.h		 defines for token names
         yacc.tmp, yacc.acts temporary files
         /usr/share/misc/yaccparparser prototype for C programs

    SEE ALSO
         lex(1)
         LR Parsing by A. V. Aho and S. C. Johnson, Computing Sur-
         veys, June, 1974.
         YACC - Yet Another Compiler Compiler by S. C. Johnson.

    DIAGNOSTICS
         The number of reduce-reduce and shift-reduce conflicts is
         reported on the standard output; a more detailed report is
         found in the y.output file.  Similarly, if some rules are
         not reachable from the start symbol, this is also reported.

    BUGS
         Because file names are fixed, at most one yacc process can
         be active in a given directory at a time.

    Printed 11/26/99	October 22, 1996			1

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