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declarations appear after the rules. Don't mistake the type of $$ in a midrule to be that of its parent rule's $$. * src/reader.c (grammar_current_rule_end): Don't invoke grammar_rule_check yet since not all symbol declarations may have been parsed yet. (grammar_midrule_action): Likewise. Don't record whether the midrule's $$ has been used yet since actions haven't been translated yet. Record the midrule's parent rule and its RHS index within the parent rule. (grammar_current_rule_action_append): Don't translate the action yet since not all symbol declarations may have been parsed yet and, thus, warnings about types for $$, $n, @$, and @n can't be reported yet. (packgram): Translate the action and invoke grammar_rule_check now that all symbol declarations have been parsed. * src/scan-code.l (handle_action_dollar): Now that this is invoked after parsing the entire grammar file, the symbol list here in the case of a midrule is actually the midrule's empty RHS, so reference its parent rule's RHS where necessary. On the other hand, now that you can already know it's a midrule, you aren't forced to think $$ has the same type as its parent rule's $$. (handle_action_at): In the case of a midrule, reference the parent rule where necessary. * src/symlist.c (symbol_list_new): Initialize new midrule-related members. (symbol_list_length): Now that this is invoked after all rules have been parsed, a NULL symbol (rather than a NULL symbol list node) terminates a rule. symbol_list_print already does this correctly. * src/symlist.h (symbol_list.midrule_parent_rule, symbol_list.midrule_parent_rhs_index): New members so that midrules can remember their relationships with their parents. * tests/input.at (Type Clashes): Extend to catch the midrule $$ error fixed by the above patch. (_AT_UNUSED_VALUES_DECLARATIONS, AT_CHECK_UNUSED_VALUES): New m4 macros implementing... (Unused values): ... this old test case and... (Unused values before symbol declarations): ... this new test case. This one is the same as `Unused values' except that all symbol declarations appear after the rules in order to catch the rest of the errors fixed by the above patch.
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.