YACC(1) 1990 YACC(1) NNAAMMEE yacc - an LALR(1) parser generator SSYYNNOOPPSSIISS yyaacccc [[ --ddllttvv ]] [[ --bb _p_r_e_f_i_x ]] _f_i_l_e_n_a_m_e DDEESSCCRRIIPPTTIIOONN _Y_a_c_c reads the grammar specification in the file _f_i_l_e_n_a_m_e 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. _Y_a_c_c normally writes the parse tables and the driver routine to the file _y._t_a_b._c. The following options are available: --bb _p_r_e_f_i_x The --bb option changes the prefix prepended to the output file names to the string denoted by _p_r_e_f_i_x. The default prefix is the character _y. --dd The --dd option causes the header file _y._t_a_b._h to be written. --ll If the --ll option is not specified, _y_a_c_c 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 --ll option is specified, _y_a_c_c will not insert the #line directives. Any #line directives specified by the user will be retained. --tt The --tt option will change the preprocessor direc- tives generated by _y_a_c_c so that debugging state- ments will be incorporated in the compiled code. --vv The --vv option causes a human-readable description of the generated parser to be written to the file _y._o_u_t_p_u_t. 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. TTAABBLLEESS The names of the tables generated by this version of _y_a_c_c are ``yylhs'', ``yylen'', ``yydefred'', ``yydgoto'', ``yysindex'', ``yyrindex'', ``yygindex'', ``yytable'', and ``yycheck''. Two additional tables, ``yyname'' and ``yyrule'', are created if YYDEBUG is defined and non-zero. FFIILLEESS _y._t_a_b._c Printed 7/27/90 May 1 YACC(1) 1990 YACC(1) _y._t_a_b._h _y._o_u_t_p_u_t /_t_m_p/_y_a_c_c._a_X_X_X_X_X_X /_t_m_p/_y_a_c_c._t_X_X_X_X_X_X /_t_m_p/_y_a_c_c._u_X_X_X_X_X_X SSEEEE AALLSSOO yyfix(1) DDIIAAGGNNOOSSTTIICCSS 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. Printed 7/27/90 May 2