YACC(1) USER COMMANDS YACC(1) NAME Yacc - an LALR(1) parser generator SYNOPSIS yacc [ -dlrtv ] [ -b _p_r_e_f_i_x ] _f_i_l_e_n_a_m_e DESCRIPTION _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: -b _p_r_e_f_i_x The -b 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. -d The -d option causes the header file _y._t_a_b._h to be written. -l If the -l 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 -l option is specified, _y_a_c_c will not insert the #line directives. #line directives specified by the user will be retained. -r The -r option causes _y_a_c_c to produce separate files for code and tables. The code file is named _y._c_o_d_e._c, and the tables file is named _y._t_a_b._c. -t The -t option changes the preprocessor directives generated by _y_a_c_c so that debugging statements will be incorporated in the compiled code. -v The -v 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. FILES _y._c_o_d_e._c _y._t_a_b._c _y._t_a_b._h _y._o_u_t_p_u_t Sun Release 4.1 Last change: July 15, 1990 1 YACC(1) USER COMMANDS YACC(1) /_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 DIAGNOSTICS 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. Sun Release 4.1 Last change: July 15, 1990 2