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destructors, printers, and actions into a code_props structure and interface. This patch merely implements code_props in scan-code.h and scan-code.l. Future patches will rewrite other modules to use it. Discussed starting at <http://lists.gnu.org/archive/html/bison-patches/2006-11/msg00020.html>. * src/location.h (EMPTY_LOCATION_INIT): Define so that it's easier to consistently initialize const structs that have an empty location field. * src/location.c (empty_location): Initialize with EMPTY_LOCATION_INIT to ensure consistency. * src/scan-code.h (code_props): New structure. (code_props_none_init, CODE_PROPS_NONE_INIT, code_props_none): New function, macro, and const global variable for initializing a code_props with no code. (code_props_plain_init, code_props_symbol_action_init, code_props_rule_action_init, code_props_translate_code): The rest of the new code_props functional interface. Among other things, the init functions set the code_props kind field so that code_props_translate_code will know whether to behave like translate_symbol_action, translate_rule_action, or translate_code. These old translate functions must remain until all other modules are updated to use the new code_props interface. (code_scanner_last_string_free): New function similar to gram_scanner_last_string_free. (code_scanner_free): Add documentation. * src/scan-code.l: Implement the new interface. (code_lex): Make it static, add a code_props* argument, and remove the rule argument. (last_string): New static global similar to the one in scan-gram.l. (SC_RULE_ACTION): Update to use the code_props* argument to code_lex instead of rule. (SC_SYMBOL_ACTION): For $$, set the is_value_used member of the code_props since Bison may one day use this information for destructors and printers. (<*><<EOF>>): Use STRING_FINISH so that last_string is set. (handle_action_dollar): Use symbol_list_n_get and set used flag directly since symbol_list_n_used_set is removed. (translate_action): Add a code_props* argument and remove the rule, action, and location arguments. Pass the code_props* on to code_lex. (translate_rule_action, translate_symbol_action, translate_code): Rewrite as wrappers around the new code_props interface. * src/symlist.h, src/symlist.c (symbol_list_n_used_set): Remove since it would eventually need to break the encapsulation of code_props.
This directory contains the Bison parser generator. See the file INSTALL for generic compilation and installation instructions. See the file doc/FAQ for frequently asked questions. Bison requires GNU m4 1.4.3 or later. See: ftp://ftp.gnu.org/gnu/m4/m4-1.4.3.tar.gz Bison can work with pre-1.4.3 distributions of GNU m4 if they are sufficiently patched, but if you encounter a bug with an older distribution and report a bug we will probably suggest that you upgrade to 1.4.3 as the first step in trying to fix it. Please send bug reports to <bug-bison@gnu.org>. Please include the version number from `bison --version', and a complete, self-contained test case in each bug report. If you have questions about using Bison and the documentation does not answer them, please send mail to <help-bison@gnu.org>. ----- Copyright (C) 1992, 1998, 1999, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. Bison is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. Bison is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with autoconf; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.